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    Wyświetlanie 1-29 z 29
    Tytuł:
    Effective separation of specularite and aegirite using chitosan as a novel depressant
    Autorzy:
    Li, Mingyang
    Zhang, Pengpeng
    Gao, Xiangpeng
    Tong, Xiong
    Xie, Xian
    Powiązania:
    https://bibliotekanauki.pl/articles/2175424.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    flotation
    iron-bearing silicates
    aegirite
    specularite
    chitosan
    depressant
    Opis:
    As a typical iron-bearing silicate gangue, aegirite often associates with specularite. Due to the iron element contained in aegirite, it has similar surface properties to specularite. Flotation is by far one of the most efficient methods of processing this kind of iron ore. But the traditional depressants unable to take action in the separation of specularite and aegirite. Chitosan was used as a novel depressant to attempt to separate specularite from aegirite through microflotation tests, adsorption tests, contact angle measurements, Zeta potential measurements, and XPS analysis. The flotation results indicate that chitosan show more strong depression effect on specularite than aegirite. Zeta potential measurements, contact angle measurements and adsorption tests demonstrate that chitosan is more inclined to adsorb on the specularite surface than aegirite, which hinders the subsequent adsorption of collector sodium oleate and increases difference in hydrophobicity between the two minerals. The XPS results of specularite validate the adsorption of chitosan on specularite, and illustrate that electrons of chitosan were partially transferred to oxygen and iron atoms in specularite during the adsorption process.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2022, 58, 6; art. no. 151692
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect and mechanism of depressant CK102 on flotation separation of fluorite and dolomite
    Autorzy:
    Li, Zhengyao
    Wang, Xuewen
    Xu, Chengyan
    Sun, Tichang
    Liu, Weiran
    Wei, Jinzhi
    Powiązania:
    https://bibliotekanauki.pl/articles/2146904.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    fluorite
    dolomite
    flotation
    depressant CK102
    adsorption
    Opis:
    For a low grade dolomite type fluorite ore in the Hebei province, it was observed that the depressant CK102, a mixture of sulfuric acid, sodium silicate and aluminum sulfate, can effectively inhibit the gangue mineral dolomite in the flotation of fluorite. However, the inhibition mechanism of the depressant is still unclear. In this paper, the flotation separation performance and underlying mechanism of CK102 inhibiting dolomite were investigated through mineral flotation tests, adsorption measurements, infrared spectroscopy, and X-ray photoelectron spectroscopy (XPS). The flotation results showed that the inhibition effect of CK102 on dolomite flotation was much more remarkable than that of fluorite flotation under optimum conditions. Adsorption measurements revealed that there was competitive adsorption between the depressant and collector and that the adsorption of the depressant CK102 prevented the collector modified sodium oleate from adsorbing onto the surface of minerals. The FT-IR and XPS results showed that the co-oxygen cross-linked component of the depressant CK102 chemisorbed on the surface of dolomite; the CaSiO3 precipitation was generated from the reaction of CK102 with Ca2+ groups on the surface of the dolomite; Al2MgO8Si2 precipitation was also generated from Mg2+ reacting with the sodium silicate and aluminum sulfate of CK102. The above adsorptions and reactions enhanced the hydrophilicity of the dolomite surface and the dolomite was effectively depressed.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2022, 58, 3; art. no. 145796
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigations on soluble starch as the depressant of hematite during flotation separation of apatite
    Autorzy:
    Bai, Shaojun
    Ding, Zhan
    Fu, Xianyu
    Li, Chunlong
    Lv, Chao
    Wen, Chao
    Powiązania:
    https://bibliotekanauki.pl/articles/110115.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    soluble starch
    depressant
    hematite
    apatite
    FTIR
    XPS
    Opis:
    In this paper, soluble starch was studied as a depressant of hematite during flotation separation of apatite using sodium oleate as a collector. Surface charge measurement, soluble starch adsorptions, Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS) were used to understand the interaction mechanisms between minerals (hematite and apatite) and soluble starch. The results indicated that chemical interaction between hematite and soluble starch was present, and supported the bonding of hydroxyl, while physical adsorption of soluble starch molecules with apatite occurred. Results of micro-flotation studies suggested that soluble starch was considered as a selective depressant for hematite. The maximum recovery difference between hematite and apatite of 77.5% was obtained with 40 mg/dm3 soluble starch. The flotation experiment results of natural iron ore showed that flotation indexes with 59.73% Fe, iron recovery of 81.5% and 75.68% of dephosphorization ratio were achieved at a soluble starch dosage of 60 mg/dm3. However, a higher dosage of soluble starch addition caused the difficulty for flotation separation of apatite from hematite. Our results provided theoretical basis for the flotation separation of apatite from iron oxide ores.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2019, 55, 1; 38-48
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Use of PASP and ZnSO4 mixture as depressant in the flotation separation of chalcopyrite from Cu-activated marmatite
    Autorzy:
    Wei, Qian
    Jiao, Fen
    Qin, Wenqing
    Dong, Liuyang
    Feng, Liqin
    Powiązania:
    https://bibliotekanauki.pl/articles/109451.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    chalcopyrite
    marmatite
    polyaspartic acid
    mixed depressant
    adsorption
    Opis:
    In this study, the synergistic depressive effect of polyaspartic acid (PASP) and zinc sulfate (ZnSO4) in the flotation separation of chalcopyrite from Cu-activated marmatite was investigated by micro-flotation experiments and ore sample flotation tests, and the possible depressive mechanism was proposed from contact angle measurements, fourier transform infrared (FT-IR) analysis, inductively coupled plasma (ICP) measurements and X-ray photoelectron spectroscopy (XPS) analysis. Microflotation tests indicated that the mixed depressant PASP/ZnSO4 (PZ) exerted strong depressive effect on Cu-activated marmatite in the pH range of 9~12, but it had little effect on chalcopyrite flotation. The ore sample flotation experiments indicated the PZ system decreased the grade of Zn in Cu concentrate by 4.18%, and the depressant consumption was reduced by more than a half. The results from contact angle measurement demonstrated that the hydrophobicity of Cu activated-marmatite surface was higher than that of chalcopyrite surface in presence of PZ. FT-IR analysis demonstrated the more intensive chemisorption of PZ on Cu-activated marmatite surface. ICP measurements showed that PASP had an excellent complexing ability with Cu2+ and Zn2+, which not only reduced the activation of Cu species, but also generated Zn-PASP complex on marmatite surface. XPS analysis indicated a stronger interaction between PZ and Cu-activated marmatite surface, and the depressant PZ may mainly react with Cu-activated marmatite surface through the copper atoms.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2019, 55, 5; 1192-1208
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The effect of a novel depressant on the separation of talc and copper –nickel sulfide ore
    Autorzy:
    Gu, Guohua
    Chen, Zhixiang
    Zhao, Kaile
    Song, Siyu
    Li, Shuangke
    Wang, Chongqing
    Powiązania:
    https://bibliotekanauki.pl/articles/110492.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    Sodium alginate
    talc
    copper–nickel sulfide
    polysaccharide depressant
    flotation
    Opis:
    This paper researched the influence of the polysaccharide polymer sodium alginate (SAG) on the depression of talc at a fixed room temperature about 25 °C through micro flotation and batch flotation experiments, zeta potential and contact angle measurements as well as infrared spectroscopy analysis. The flotation results displayed that the SAG had a significant influence on the flotation of talc but less influence on sulphide flotation. Compared with the depressant carboxymethyl cellulose (CMC) and guar gum, using of the SAG gave the highest copper recovery. It could not only eliminate a talc removal step, but also significantly decrease in the depressant consumption by half at least. Sodium alginate apparently adsorbs on the talc surface and promotes hydrophilization, as revealed by contact angle tests (contact angle decreased from 75 to 33° after treating with SAG). It is demonstrated that the SAG obviously absorbed at the surface of talc but rarely for chalcopyrite through the results of zeta potential measurements and infrared spectroscopy analysis.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2019, 55, 1; 116-127
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of diethylenetriaminepenta pentasodium salt as an eco-friendly depressant to effectively improve the flotation separation of scheelite and calcite
    Autorzy:
    Zhou, Hepeng
    Wu, Handan
    Guo, Jiangfeng
    Tang, Xuekun
    Huang, Wen
    Luo, Xianping
    Powiązania:
    https://bibliotekanauki.pl/articles/27323649.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    flotation
    scheelite
    calcite
    diethylenetriaminepenta pentasodium salt
    depressant
    adsorption
    Opis:
    Diethylenetriaminepenta (methylene-phosphonic acid) pentasodium salt (DTPMPA), an eco-friendly reagent, was tried for the first time as a depressant for flotation separation of scheelite from calcite. Micro-flotation tests show that DTPMPA can selectively depress the floatability of calcite. In contrast, DTPMPA barely affects the flotation behavior of scheelite. Based on the selective depress effect, floatation separation of scheelite and calcite can be effectively achieved by using DTPMPA as depressant in artificially mixed minerals flotation tests. Based on a series of measurements, it found the surface of calcite was positively charged due to the existence of Ca ion site, which can be chelated with –PO3H- functional group on the surface of DTPMPA. In the flotation process, DTPMPA can be chemically absorbed on the surface of calcite to inhibit further collector adsorption. On contrast, little DTPMPA was adsorbed on the surface of scheelite due to the spatial site resistance and electrostatic repulsion induced by surface WO42+. All in all, these results exhibit DTPMPA has excellent selective depression ability on calcite, which can be potentially applied in the actual scheelite flotation process.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2023, 59, 6; art. no. 174718
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Cellulase as a new phosphate depressant in dolomite-phosphate flotation
    Autorzy:
    Yehia, A.
    Khalek, M. A.
    Ammar, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/110349.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    flotation
    cellulose
    cellophane
    dolomite
    oleic acid
    Opis:
    Recently, many research efforts have been made to reduce the magnesium content in the phosphate concentrate to meet the requirement for phosphoric acid production and other applications. A bioprocessing technique is among these efforts. However, this paper was devoted to study the use of cellulase enzyme as a new phosphate depressant during fatty acid flotation of a calcareous phosphate rock. The flotation behavior of collophane and dolomite as single minerals using oleic acid as a collector and cellulase enzyme as the phosphate depressant was investigated in details. The results from single mineral flotation tests were discussed based on FTIR and zeta potential measurements to find out the mechanism of cellulase depression of phosphate. The findings from the single minerals tests were used to develop a selective flotation process for recovery of phosphate minerals from the natural phosphate ore. The flotation experiments were carried out to apply this new process using the calcareous phosphate ore. Under the optimum flotation conditions, 0.04% cellulase and 0.5 mM oleic acid, a phosphate concentrate containing 0.89% MgO with a P2O5 recovery of 75% was obtained from the phosphate ore containing 2.2% MgO.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2017, 53, 2; 1092-1104
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Selective separation of chalcopyrite from jamesonite with guar gum
    Autorzy:
    Chen, Xiong
    Gu, Guohua
    Zhu, Renfeng
    Wang, Chongqing
    Powiązania:
    https://bibliotekanauki.pl/articles/110473.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    guar gum
    chalcopyrite
    jamesonite
    flotation depressant
    Opis:
    A novel reagent, guar gum (GG), is investigated as the depressant on the depression of chalcopyrite and jamesonite, when mixed aerofloat (CSU11) is used as the collector in flotation tests. Kinetics, dynamic potential, adsorption and infrared spectra analysis are performed to study the interaction mechanism between GG and minerals. The flotation results display that selective flotation separation of chalcopyrite from jamesonite is achieved under conditions of depressant GG 2.5 mg/dm3, collector CSU11 10 mg/dm3 and frother MIBC (Methyl isobutyl carbinol) 10 mg/dm3 at pH 5.3. As to mixed minerals flotation, the Cu grade and recovery in the concentrate is 21.35 % and 85.12 %, respectively, indicating that GG has a selective depression effect on jamesonite. Flotation kinetics shows that the addition of GG can dramatically reduce the floatability of jamesonite but hardly influences that of chalcopyrite. The zeta potential and adsorption reveal that the depressant GG adsorbs strongly on the surface of jamesonite. Infrared spectra reveal a dominant chemisorption between GG and jamesonite, while GG occurs weak chemisorption on chalcopyrite surface. This is the reason why GG has excellent selectivity for jamesonite and less effect on chalcopyrite.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2019, 55, 1; 237-247
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Flotation separation of chalcopyrite from talc using carboxymethyl chitosan as depressant
    Autorzy:
    Qian, G.
    Bo, F.
    Danping, Z.
    Jujie, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/110249.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    talc
    chalcopyrite
    flotation
    separation
    carboxymethyl chitosan
    Opis:
    Flotation separation of chalcopyrite from talc using carboxymethyl chitosan as a depressant was studied. Flotation tests indicated that carboxymethyl chitosan had a selective depression effect on talc and the use of carboxymethyl chitosan as the depressant could achieve flotation separation of chalcopyrite from talc at pH 7. Adsorption studies showed that carboxymethyl chitosan only adsorbed on the surface of talc. This was the reason why carboxymethyl chitosan had high depression selectivity for talc. The zeta potential measurements and XPS analysis indicated that carboxymethyl chitosan adsorbed on the talc surface mainly through physical interaction and hydrophobic interaction may be the main driving force.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2017, 53, 2; 1255-1263
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of depressants in the selective flotation of smithsonite and calcite using cationic collector
    Autorzy:
    Liu, Hongjiang
    Zhang, Guofan
    Luo, Yuanjia
    Powiązania:
    https://bibliotekanauki.pl/articles/1449481.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    smithsonite
    calcite
    selective separation
    depressant
    Opis:
    This work studied the effects of sodium hexametaphosphate (SHMP), tanning extract, water glass (WG) and calcium lignosulfonate (CLS) as depressants for the separation of smithsonite from calcite by using a cationic collector called octadecylamine acetate (ODA). Micro-flotation experimental tests showed that CLS can greatly and selectively depress calcite. When the dosages of CLS used were 20 and 40 mg/L, a concentrate with Zn grades of 42.54% and 49.32% and Zn recoveries of 81.66% and 68.00% was achieved in the flotation separation of mixed mineral (1:1 smithsonite:calcite). Zeta potential and adsorption measurements revealed that the adsorption of CLS on calcite’s surface was greater than that on smithsonite’s surface. When CLS was added, the adsorption of ODA was hindered greatly on the calcite’s surface but slightly on the smithsonite’s surface.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2020, 56, 1; 1-10
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    New method of electrostatic separation of the oxidized iron ore
    Autorzy:
    Idres, A.
    Bouhedja, A.
    Bounouala, M.
    Benselhoub, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/89112.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Wrocławska. Wydział Geoinżynierii, Górnictwa i Geologii. Instytut Górnictwa
    Tematy:
    iron ore
    electrostatic separation
    reagent-collector
    reagent–depressant
    efficiency
    Opis:
    The complexity of the mineralogical, chemical and exogenous parameters generates a low efficiency of electrical separation of oxidized iron ore. For this purpose, a study was conducted to provide a method for electrostatic separation and to select the chemical reagents. And this, for increasing the contrast of the dielectric separating minerals in the corona discharge field. The reagent-collector used is the auramine with a specific consumption of 0.3 kg/t. Whereas, the reagent depressants is carboxymethyl cellulose mixture with a specific consumption of 0.25 kg/t. From the obtained test results electrical treatment of oxidized iron ore are satisfied for proposed process.
    Źródło:
    Mining Science; 2016, 23; 33-41
    2300-9586
    2353-5423
    Pojawia się w:
    Mining Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ligandy receptora NMDA w leczeniu zaburzeń depresyjnych
    The NMDA receptor ligands in anti-depressant therapy
    Autorzy:
    Stasiuk, Weronika
    Warchulińska, Joanna
    Olszewska, Anna
    Poleszak, Ewa
    Powiązania:
    https://bibliotekanauki.pl/articles/943323.pdf
    Data publikacji:
    2016
    Wydawca:
    Instytut Medycyny Wsi
    Tematy:
    depresja
    receptor nmda
    terapia przeciwdepresyjna
    Opis:
    Wprowadzenie. Nowy kierunek badań nad zaburzeniami depresyjnymi koncentruje się na hamowaniu aktywności receptora NMDA, co stwarza nowe możliwości leczenia chorób wywołanych nadmierną aktywacją układu glutaminianergicznego. Cel pracy. Celem prezentowanej pracy jest przegląd ligandów (w szczególności antagonistów) receptora NMDA działających na jego ekspresję i funkcje oraz ich wpływ na działanie klasycznych leków przeciwdepresyjnych. Opis stanu wiedzy. Skuteczność obecnie stosowanych metod leczenia zaburzeń depresyjnych jest niezadowalająca i obarczona wieloma skutkami ubocznymi. Niepokojący jest również fakt, iż u wielu pacjentów rozwija się lekooporność. Dlatego też opracowuje się nowsze, skuteczniejsze metody leczenia. Wykazano, że jednym z istotnych mechanizmów działania przeciwdepresyjnego jest blokowanie receptora NMDA. Podsumowanie. Wprowadzenie do lecznictwa antagonistów receptora NMDA stwarza nowe możliwości terapeutyczne zaburzeń depresyjnych, a także wydaje się być interesującą alternatywą w leczeniu depresji lekoopornych.
    A new direction in research on depressive disorders focuses on reducing the activity of the NMDA receptor, which opens up new possibilities for the treatment of diseases caused by the excessive activity of the glutamatergic system. The aim of this work is the study of ligands (especially antagonists) of the NMDA receptor, which influence its expression and function as well as their impact on the action of classic anti-depressant medications. The effectiveness of currently utilized depressive disorder treatment methods is unsatisfactory and linked to many sideeffects. It is also a worrying fact that many patients develop drug resistance. This is why there is a continued effort for the development of newer, more effective treatment methods. It has been shown that one of the key anti-depressant mechanisms of action is through the blockage of the NMDA receptor. The introduction into the treatment regime of antagonists of the NMDA receptor opens new therapeutic possibilities in the treatment of depressive disorders, as well as being a potential alternative in the treatment of drug resistant forms of the disease.
    Źródło:
    Medycyna Ogólna i Nauki o Zdrowiu; 2016, 22(51), 3
    2083-4543
    Pojawia się w:
    Medycyna Ogólna i Nauki o Zdrowiu
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of depressants in the selective flotation of smithsonite and calcite using potassium lauryl phosphate as collector
    Autorzy:
    Sun, Qing
    Feng, Qiming
    Shi, Qing
    Powiązania:
    https://bibliotekanauki.pl/articles/110635.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    smithsonite
    calcite
    flotation
    depressant
    separation
    Opis:
    In order to selectively separate smithsonite and calcite using potassium lauryl phosphate as collector and reveal the depression mechanism, the approaches of micro-flotation and zeta potential measurements were adopted. The effects of sodium hexametaphosphate (SHMP), water glass (WG), carboxymethyl cellulose (CMC) and lignosulfonate calcium (LSC) as depressants on smithsonite and calcite have been studied through micro-flotation. The single mineral flotation tests show that LSC can depress calcite, but it has little effect on smithsonite flotation. Flotation separation of a mixture of smithsonite and calcite can be completed to obtain a zinc concentrate grade up to 33.85% Zn with a recovery of 70.06%. The zeta potential results illustrate that LSC has higher tendency to be adsorbed on the surface of calcite. However, there is little adsorption of LSC on smithsonite.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2019, 55, 1; 89-96
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Flotation separation of scheelite from calcite using sodium polyacrylate as depressant
    Autorzy:
    Zhang, Y.
    Chen, R.
    Li, Y.
    Wang, Y.
    Luo, X.
    Powiązania:
    https://bibliotekanauki.pl/articles/110896.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    scheelite
    calcite
    flotation
    sodium polyacrylate
    selective depression
    Opis:
    The depressing properties of sodium polyacrylate (PA-Na) for calcite from scheelite were studied by microflotation experiments, zeta potentials, X-ray photoelectron spectroscopy (XPS) and density functional theory (DFT) calculation. Flotation results revealed that the selective depression effect of PA-Na was better than that of sodium silicate (Na2SiO3), and PA-Na can depress calcite more effectively than scheelite. The flotation recovery of scheelite and calcite kept at about 75% and 15% respectively at the pulp pH 9.3~9.6 and PA-Na concentration from 37.5 mg/dm3 to 50 mg/dm3. The zeta potentials of the minerals were significantly altered and the zeta potential of calcite became more negative than scheelite. XPS analysis deduced the occurrence of chemisorption between PA-Na and mineral surfaces, and the chemisorption of PA-Na on calcite was stronger than on scheelite. The results from DFT calculation demonstrated that the absolute value of the adsorption energy in the presence of PA-Na on the surface of calcite {104} was larger than on the surface of scheelite {111}. With the combination of the analysis, it could be concluded that calcite was more easily depressed than scheelite, and this finding remarkably matched with the microflotation experimental results. Furthermore, by using PA-Na as depressant, the flotation separation of scheelite from calcite can be achieved by controlling the flotation pH and PA-Na dosage.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2018, 54, 2; 505-516
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Quinic acid as a novel depressant for efficient flotation separation of scheelite from calcite
    Autorzy:
    Huang, Zheyu
    Kuang, Jingzhong
    Yu, Mingming
    Ding, Dan
    Powiązania:
    https://bibliotekanauki.pl/articles/24085979.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    quinic acid
    scheelite
    calcite
    depression
    selective adsorption
    Opis:
    There are difficulties to the conventional depressant for achieving separation of scheelite from calcite for the sake of their similar surface properties. The paper reported that a new depressant quinic acid (QA) was used for separating scheelite from calcite. The adsorption experiments, zeta potential experiment, contact angle, FTIR, XPS analysis and crystal chemistry analysis were utilized to known the depression mechanism of selectivity. The results showed that the recovery of calcite decreased drastically after QA added, whereas hardly influenced on scheelite. The tungsten concentrate could reach 66.24% WO3 grade and 89.46% recovery with 1.5×10-4 mol•L-1 QA at pH=9. The surface adsorption quantity of the QA on calcite was much greater than scheelite, which enhanced significantly the hydrophilicity of calcite surface. Due to its negative charge, QA could be adsorbed on the surface of calcite which had positive charge instead of that of scheelite with negative charge. Subsequently, free carboxyl groups of QA could chelated with Ca2+ species on the calcite surface to form stable chemical adsorption in order to prevent the Pb-BHA to form further adsorption on that, so there was no increase significantly on hydrophobicity. However, QA was obviously weak for adsorbing while Pb-BHA which could still be chemically adsorbed on scheelite surface of pre-treated with QA.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2023, 59, 2; art. no. 166008
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The effect of lizardite on talc flotation using carboxymethyl cellulose as a depressant
    Autorzy:
    Deng, Jie
    Yang, Siyuan
    Zhang, Wencai
    Liu, Cheng
    Li, Hongqiang
    Powiązania:
    https://bibliotekanauki.pl/articles/1449414.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    talc
    lizardite
    flotation
    CMC
    magnesium ion
    Opis:
    The effect of lizardite on talc flotation when using carboxymethyl cellulose (CMC) as a depressant was studied by micro-flotation experiments and adsorption measurements, zeta-potential measurements, magnesium ion dissolution analysis, and solution chemistry calculation. The results for the micro-flotation experiments showed that the addition of lizardite further decreased the floatability of talc at pH 8.5 when using CMC as the depressant. The mechanism was that magnesium ions dissolved from lizardite lattice, then formed hydrolyzed species of magnesium cations and interacted with talc surfaces, which promoted CMC adsorption, and thus decreasing talc floatability.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2020, 56, 4; 702-709
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The selective depression effect of sodium hexametaphosphate on the separation of chlorite and specularite
    Autorzy:
    Zhao, Fugang
    Yu, Xiankun
    Gao, Xiangpeng
    Li, Mingyang
    Chen, Xiangxiang
    Powiązania:
    https://bibliotekanauki.pl/articles/24085963.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    flotation
    depressant
    chlorite
    specularite
    adsorption
    Opis:
    Flotation is the most known beneficiation method for the separation of complex and refractory iron ores. As a typical iron-containing silicates, it is difficult to separate chlorite from specularite, because of the similar surface physicochemical properties. In this study, the selective depression effect of sodium hexametaphosphate (SHMP) was conducted via the cationic micro-flotation. The surface adsorption mechanism between SHMP and the two mineral surface was explored through surface adsorption amount tests, Zeta-potential measurements, Fourier transform infrared (FT-IR) and X-ray photoelectron spectroscopy (XPS) analyses. The micro-flotation results indicated that SHMP could selectively depress around 90% of chlorite, while its effect on the floatability of specularite was negligible (<20% depressing). The surface adsorption amount tests, Zeta-potential measurements analysis demonstrated that SHMP selectively adsorb on chlorite surface while on the surface of specularite is feeble. The further surface adsorption analysis via FT-IR and XPS proved that SHMP selective adsorption occurred on the chlorite surface mainly by chemisorption mainly through the chelation reaction between O in the phosphate groups of SHMP molecular and metal ions on surface of chlorite.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2023, 59, 2; art. no. 166495
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Water quality effects on a sulfidic PGM ore: Implications for froth stability and gangue management
    Autorzy:
    Manono, M. S.
    Corin, K.
    Wiese, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/110603.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    entrainment
    water quality
    froth stability
    electrolytes
    Depressant behavior
    Opis:
    Polysaccharide depressants play a crucial role in the flotation of sulfidic PGM bearing ores as they prevent naturally floatable gangue (NFG) from reporting to the concentrate. This action is regarded as critically important because less dilution of the concentrate means lower costs for downstream processes. However, abnormal water conditions such as high concentrations of ions in the flotation system can modify the selectivity of these depressants. It is well known that the existence of selected electrolytes in water can alter the behaviour of some polysaccharide depressants by enhancing their adsorption onto gangue minerals and thereby prevent naturally floatable gangue from moving into the froth phase. Concurrently these same electrolytes may enhance frothability owing to their stabilising effect on the bubbles within the system. Plant water at various ionic strengths was investigated against sodium carboxymethyl cellulose (CMC) dosages in order to understand electrolyte-depressant interactive effects during the flotation of a Merensky ore in a batch flotation cell, using entrainment, rate of NFG recovery, and total gangue recovery as proxies. The study showed that the NFG recovery per unit mass of water decreased with increasing ionic strength at all CMC dosages, however the total amount of gangue reporting to the concentrate increased with increasing ionic strength at all CMC dosages. Thus, this paper considers the effects of both ionic strength and CMC dosage within flotation. It further investigates whether any interactive effects exist between froth stability and entrainment when considered simultaneously.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2018, 54, 4; 1253-1265
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Insights into the depression effect and adsorption mechanism of HACC on chalcopyrite surface in Cu-Mo flotation separation
    Autorzy:
    Li, Mingyang
    Zhang, Pengpeng
    Xiangpeng, Gao
    Huang, Lingyun
    Powiązania:
    https://bibliotekanauki.pl/articles/27323662.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    chalcopyrite
    molybdenite
    flotation
    adsorption
    depressant
    Opis:
    In this study, hydroxypropyltrimethyl ammonium chloride chitosan (HACC) was first introduced as a depressant during separating chalcopyrite from molybdenite (Cu-Mo). The selective effects of HACC on the separation of Cu-Mo were conducted by single-mineral flotation experiments. The findings from this study revealed that HACC helped separate Cu and Mo efficiently at pH 6 with 8 mg/dm3 of HACC, resulting in 76.22% and 5.38% of Mo and Cu flotation recovery, respectively. The adsorption mechanism of HACC was investigated via zeta potential, adsorption density, and contact angle measurement along with FT-IR and XPS analyses. The contact angle and adsorption density measurements offer indisputable proof that HACC can adsorb on the surface of chalcopyrite. Furthermore, FT-IR and XPS analyses confirm that N atoms in quaternary ammonium groups of HACC interact with Cu sites on the surface of chalcopyrite. The findings also suggest that HACC adsorbs on the surface without significantly impacting molybdenite. All these results confirm that HACC can be an effective chalcopyrite depressant.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2023, 59, 6; art. no. 172481
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Partial purification and identification of cardiodepressant factor from the posterior pituitary lobe in rats
    Autorzy:
    Goraca, A.
    Walkowiak, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/69490.pdf
    Data publikacji:
    2000
    Wydawca:
    Polskie Towarzystwo Fizjologiczne
    Tematy:
    myocardial depressant factor
    posterior pituitary lobe
    hemorrhagic shock
    cardiodepressant factor
    purification
    rat
    identification
    Źródło:
    Journal of Physiology and Pharmacology; 2000, 51, 1
    0867-5910
    Pojawia się w:
    Journal of Physiology and Pharmacology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Utilization of N-carboxymethyl chitosan as a selective depressant for talc in flotation of chalcopyrite
    Autorzy:
    Liu, Cheng
    Feng, Qiming
    Shi, Qing
    Zhang, Wencai
    Song, Shaoxian
    Powiązania:
    https://bibliotekanauki.pl/articles/110512.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    chalcopyrite
    talc
    flotation separation
    N-carboxymethyl chitosan
    Opis:
    Flotation separation of chalcopyrite from talc is difficult because of the natural hydrophobicity of two minerals. In this work, the flotation separation of chalcopyrite from talc using N-carboxymethyl chitosan as a depressant for talc was studied. The micro-flotation results indicated that the flotation separation of chalcopyrite from talc cannot be realized effectively at pH 9 with low concentration of N-carboxymethyl chitosan, in the presence of calcium ions, talc was more efficiently depressed by N-carboxymethyl chitosan, while the chalcopyrite recovery was not influenced. Contact angle, zeta potential and adsorption results showed that Ca2+ and CaOH+ absorbed on the talc surface and increased the absorption amount of N-carboxymethyl chitosan on the mineral surface, and increased hydrophilicity of talc surface, resulting the selective depression for talc in chalcopyrite flotation.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2019, 55, 1; 108-115
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Selective flotation of witherite from calcite using potassium chromate as a depressant
    Autorzy:
    Qiu, Yangshuai
    Zhang, Lingyan
    Jiao, Xuan
    Guan, Junfang
    Li, Ye
    Qian, Yupeng
    Powiązania:
    https://bibliotekanauki.pl/articles/110784.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    witherite
    calcite
    selective flotation
    sodium oleate
    potassium chromate
    Opis:
    Witherite has been widely used as an industrial and environmental source of barium, with calcite being the primary associated carbonate mineral. However, few studies have been conducted to effectively concentrate witherite from barium ores. In this work, with the treatment of potassium chromate (K2CrO4) and sodium oleate (NaOL), witherite was selectively separated from calcite through selective flotation at different pH conditions. In addition, contact angle, Zeta potential, adsorption and X-ray photoelectron spectroscopy measurements were performed to characterize the separation mechanisms. The results demonstrated that NaOL had a strong collecting ability for both witherite and calcite; nevertheless, witherite could be effectively selected from calcite with the highest recovery at pH 9 in the presence of K2CrO4. From the XPS measurements, NaOL and K2CrO4 were found to be primarily attached to the surfaces of witherite and calcite through chemisorption. The presence of K2CrO4 on the surface of calcite adversely influenced the NaOL adsorption, which could make the flotation separation efficient and successful.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2019, 55, 2; 565-574
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Flotation separation of cassiterite and chlorite using carboxymethyl cellulose as a depressant
    Autorzy:
    Hu, Yang
    Ying, Luo Hong
    Zhang, Ying
    Wei, Lu Kuan
    Hao, Guan Zhen
    Powiązania:
    https://bibliotekanauki.pl/articles/2175422.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    cassiterite
    chlorite
    sodium oleate
    carboxymethyl cellulose
    selective inhibition
    Opis:
    The nature and mechanism of interaction between carboxymethyl cellulose (CMC) with cassiterite (and chlorite surfaces) and their effects on the flotation separation process of cassiterite (from chlorite) were investigated by micro-flotation tests, surface adsorption experiments, zeta potential measurements, solution chemical calculation, infrared spectroscopy, and X-ray photo-electron spectroscopy (XPS). The results from single mineral tests revealed that CMC exhibited good selective inhibition effects with cassiterites and chlorites. When the dosage was 12.5 mg/L at pH 8, cassiterite and chlorite recovery was 92.2% and 6.3%, respectively. The artificial mixed ore test revealed that the flotation separation effect was the best when the dosage of CMC was 6.5 mg/L. Cassiterite used during the studies was 75.1% pure. The recovery was 82.8%. The interaction between CMC and the cassiterite surface led to a shift in the zeta potential toward the negative direction. CMC was weakly adsorbed on the cassiterite surface. There was no significant impact on the subsequent collection of sodium oleate. The concentration of C atom increased post interaction, and the potential shifted toward the negative direction. Characteristic CMC peaks were observed at this point. Hydrogen bonds and weak chemisorption interactions between CMC and chlorite affected the interaction between sodium oleate and the chlorite surface. It also affected the flotation results. The cassiterite and chlorite were separated effectively.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2022, 58, 6; art. no. 155141
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparison of the depression effect of two thiol depressants on the separation of specularite and aegirite
    Autorzy:
    Li, Mingyang
    Zhang, Chen
    Gao, Xiangpeng
    Xie, Xian
    Tong, Xiong
    Powiązania:
    https://bibliotekanauki.pl/articles/2175426.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    aegirite
    specularite
    flotation
    depressant
    iron-bearing silicate
    Opis:
    In this work, two thiol-type reagents, thioglycolic acid (TGA) and mercaptopropionic acid (MPA), were firstly exploited and compared as aegirite depressants with sodium oleate (NaOl) as the collector to separate specularite from aegirite by flotation. The adsorption performances and mechanisms of TGA and MPA on aegirite surface were investigated via flotation experiments, Zeta potential tests, adsorption measurements, contact angle dimensions, and surface characterizations. The results of flotation indicated that TGA and MPA exhibited a considerable depression impact on the flotation of aegirite but little effect on specularite. TGA depicted more excellent depression performance than MPA, which was confirmed by HLB calculation. The results demonstrated that TGA and MPA favorably adsorbed on aegirite surface instead of specularite, hindering the subsequent adsorption of NaOl on specularite and resulting in the surface being hydrophilic. XPS results revealed that TGA and MPA were significantly adsorbed on the surface of aegirite through an interaction between the carboxyl and thiol groups of the depressants and the Si and Fe on the surface of aegirite.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2022, 58, 6; art. no. 152164
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The flotation separation of barite-calcite using sodium silicate as depressant in the presence of sodium dodecyl sulfate
    Autorzy:
    Chen, Xiong
    Gu, Guohua
    Liu, Donghui
    Zhu, Renfeng
    Powiązania:
    https://bibliotekanauki.pl/articles/110272.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    flotation
    calcite
    barite
    sodium dodecyl sulfate
    sodium silicate
    Opis:
    The flotation separation of barite from calcite using sodium dodecyl sulfate (SDS) as the collector and sodium silicate (SS) as the depressant has been concretely studied in this paper. The results show that SDS has high collecting ability for both barite and calcite and that the flotation separation of barite from calcite cannot be achieved by using SDS alone. The depressant sodium silicate has a selective depression effect on calcite by the control of the pulp pH at 9.0 in the presence of SDS. Through locked cycle tests, a concentrate containing 95.54% BaSO4 can be obtained from an actual ore containing 24.5% BaSO4, with a recovery of 86.11%. The zeta potential measurements, adsorption analysis and infrared spectrum studies reveal that the pre-adsorption of sodium silicate strongly favors the adsorption of SDS on the calcite surface and adversely affects SDS adsorption on the barite surface. This property is the reason for the selective depression of SS on calcite.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2019, 55, 2; 346-355
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of food-grade guar gum on flotation separation of chalcopyrite and monoclinic pyrrhotite in low-alkali systems
    Autorzy:
    Chen, Xiong
    Gu, Guohua
    Li, Lijuan
    Chen, Zhixiang
    Powiązania:
    https://bibliotekanauki.pl/articles/110629.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    food-grade guar gum
    chalcopyrite
    monoclinic pyrrhotite
    flotation depressant
    Opis:
    The flotation separation of chalcopyrite from monoclinic pyrrhotite using food-grade guar gum (FGG) as a depressant was studied through micro flotation and flotation kinetics experiments, zeta potential, adsorption measurements and scanning electron microscope (SEM) analysis as well as infrared spectroscopy analysis. The flotation tests showed that the reagent scheme of depressant FGG 40 mg/dm3, collector PAX (potassium amyl xanthate) 10 mg/dm3 and frother MIBC (Methyl isobutyl carbinol) 10 mg/dm3 at pH 8.0 could achieve selective flotation separation of chalcopyrite from monoclinic pyrrhotite (a concentrate with Cu grade of 22.35% and recovery of 82.52% was achieved from the mixed minerals flotation), which indicated that FGG exhibited a selective depression effect on monoclinic pyrrhotite The kinetics, zeta potential, adsorption, SEM and infrared studies revealed that the depressant FGG could absorb more strongly on the surface of monoclinic pyrrhotite than chalcopyrite. Additionally, the results revealed that the interaction of FGG with the monoclinic pyrrhotite surface was governed primarily by strong chemisorption, whereas FGG mainly bonded to chalcopyrite through hydrogen bonding bonding. This property was the reason why FGG had excellent depression selectivity toward monoclinic pyrrhotite and weak depression effect on chalcopyrite flotation.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2019, 55, 2; 437-447
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effective flotation separation of scheelite and calcite by applying methylene phosphonic acid sodium as a novel and green depressant
    Autorzy:
    Zhou, Hepeng
    Wu, Handan
    Guo, Jiangfeng
    Tang, Xuekun
    Huang, Wen
    Luo, Xianping
    Powiązania:
    https://bibliotekanauki.pl/articles/24086193.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    scheelite
    calcite
    inhibition mechanism
    flotation separation
    Opis:
    It is known that the flotation separation of scheelite and calcite is quite difficult due to their similar surface properites. To slove the problem, ethylenediaminetetra (methylene phosphonic acid) sodium (EDTMPS), an environmentally friendly reagent, was employed as an efficient depressant for flotation separation of calcite for the first time. In flotation experiments, it demonstrates that EDTMPS could strongly inhibit the flotation of calcite but barely affect the flotaiton behavior of scheelite, showing excellent dpress ability and selectivity. Based on a series of measurements including contact angle analysis, zeta potential, and XPS analysis, it was found that large amout of EDTMPS could be absorbed on the surface of calcite through strong chemical chelation reaction and thus inhibiting the further adsorption of NaOL. On the contrary, little EDTMPS was absorbed on that of scheelite owing to the negatively charged tungstate ions on the surface in relative terms. All in all, these results exhibit EDTMPS has excellent selective inhibition ability on calcite, which can be potentially applied in actual scheelite and calcite flotation separation process.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2023, 59, 3; art. no. 168517
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Acidified water glass in the selective flotation of scheelite from calcite, part II: species in solution and related mechanism of the depressant
    Autorzy:
    Kupka, Nathalie
    Kaden, Peter
    Jantschke, Anne
    Schach, Edgar
    Rudolph, Martin
    Powiązania:
    https://bibliotekanauki.pl/articles/1845224.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    acidified water glass
    scheelite calcite separation
    froth flotation
    mechanism
    Opis:
    Sodium silicate is one of the main depressants against calcite and fluorite in the scheelite flotation industry. In the first part of this article, the authors acidified sodium silicate (AWG) with three acids (sulfuric, oxalic and hydrochloric) to improve its performance. Results showed that acidified water glass outperforms alkaline water glass in terms of selectivity: it increases mainly the grade by further depressing silicates and calcium-bearing minerals. In most cases, AWG requires lower dosages to do so. The effect of acidified water glass is evaluated through Mineral Liberation Analysis (MLA), froth analysis, Raman and Nuclear Magnetic Resonance (NMR) spectroscopy in order to hypothesize its mechanism. MLA shows that AWG affects silicates and sulfides more intensely than semi-soluble salttype minerals. Froth observations indicate other species in solution associated to the acid having an impact on the flotation results. Raman spectroscopy and NMR measurements indicate that the solution undergoes deep depolymerization when water glass is acidified. Lower molecular weight silica species, specifically Si-O monomers such as SiO(OH)3- will be responsible for the depression of the gangue minerals and are the drivers of the selectivity of AWG, more than orthosilicic acid. Depolymerization is more or less effective depending on the mass ratio of the acid to water glass and depending on the acid.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2020, 56, 5; 797-817
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On the use of $Na_2SO_3$ as a pyrite depressant in saline systems and the presence of kaolinite
    Autorzy:
    Arancibia-Bravo, María P.
    Lucay, Freddy A.
    Sepúlveda, Felipe D.
    Cisternas, Luis A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1446523.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    Na2SO3
    IPETC
    clays
    flotation
    saline solution
    artificial neural networks
    Opis:
    The effect of Na2SO3 as a pyrite depressant in NaCl and KCl saline media and the presence of kaolinite were evaluated by zeta potential tests. Chalcopyrite was also included in the study, because pyrite usually accompanies this mineral. Subsequently, the floatability results of both minerals in the NaCl solution were optimized based on the design of experiments (DoE). The Box–Behnken DoE was applied considering the percentage of kaolinite $(X_1)$, collector dose $(X_2)$, and depressant dose $(X_3)$ as factors. The results were modeled using artificial neural networks (ANNs) to construct contour plots and to determine the optimal conditions. In particular, maximization of the mass recovery of chalcopyrite and minimization of that of pyrite were sought. The particle swarm optimization algorithm was used as an optimization technique. The results indicated that the optimal conditions to maximize the floatability of chalcopyrite were kaolinite 6.85%, collector dose $3.58 × 10^{–3} mol$ / $dm^3$, and depressant dose $3.49 × 10^{–5} mol$ / $dm^3$. On the contrary, the optimal conditions to minimize the floatability of pyrite were 5% kaolinite, collector dose $5 × 10^{–4} mol$ / $dm^3$, and depressant dose $6.4 × 10^{–5} mol$ / $dm^3$. Under these conditions, the mass recoveries of chalcopyrite and pyrite were 66.1% and 14.0%, respectively. The results also indicated that the presence of kaolinite negatively affects the flotation of chalcopyrite, while the effect of $Na_2SO_3$ is not significant. In general, the findings suggest that $Na_2SO_3$ is a viable alternative to consider as a pyrite depressant in saline environments.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2021, 57, 4; 168-179
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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