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Wyświetlanie 1-15 z 45
Tytuł:
Comparative study on removal of metallurgical silicon impurities by different acid leaching methods
Autorzy:
Gao, Zijie
Luo, Dawei
Powiązania:
https://bibliotekanauki.pl/articles/24085856.pdf
Data publikacji:
2023
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
metallurgical-grade silicon
hydrometallurgy
acid leaching
impurity removal efficiency
Opis:
Hydrometallurgy is considered a promising method to produce solar-grade silicon (SOG-Si) from metallurgical-grade silicon (MG-Si) due to its advantages of low cost, simple operation, and easy control. In this paper, the effects of particle size of MG-Si, type of acid, leaching time, temperature, and liquid-to-solid ratio on the purification efficiency were investigated in an external field environment with the addition of ultrasound. The purification efficiencies of the two acid-leaching methods were compared. It was found that the simultaneous use of HCl + HNO3 was more effective than using only HCl for impurity removal in MG-Si: the extraction efficiencies of impurities Fe and Al were increased by 2.2% and 13.4%, respectively. The impurity contents in MG-Si before and after calcination pretreatment were also compared. This paper is expected to help researchers select the appropriate hydrometallurgical technique to reduce the impurity content in MG-Si.
Źródło:
Physicochemical Problems of Mineral Processing; 2023, 59, 2; art. no. 162331
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimizing the removal of iron oxide from Egyptian feldspar ore
Autorzy:
Yassin, E. Khaled
Elbendari, A.M.
Hassan, El-Sayed R. E.
Powiązania:
https://bibliotekanauki.pl/articles/27323643.pdf
Data publikacji:
2023
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
feldspar ore
iron oxide contamination
ball mill
Carpco magnetic separator
acid leaching
whiteness
Opis:
The demand for feldspar as a raw material for various industrial applications continuously increases. Feldspar is a primary raw material in manufacturing ceramics, glass, fillers, welding electrodes, and enamel. Feldspar is often associated with iron oxide, which decreases its economic value and hinders its industrial application. The present work aimed at reducing iron oxide content in Egyptian feldspar ore from the Wadi Zerabi locality. Ball milling was used for preparing feldspar feed of size -250+45μm. Carpco dry high-intensity magnetic separation followed by acid leaching processes were carried out in order to decrease the iron contamination and increase the feldspar content. A Box-Behnken statistical design was used to optimize the magnetic separation results. From a feldspar feed containing 1.40% Fe2O3, a non-magnetic concentrate of 0.25% Fe2O3 was obtained. The Fe2O3 removal reached up to 82% with a high yield as the % weight of non-magnetic feldspar reached up to 97.5%. The leaching process further reduced the iron oxide content down to 0.19 %. Also, the feldspar whiteness was improved from 65.17% in the original ore to 85.60% in the leached product.
Źródło:
Physicochemical Problems of Mineral Processing; 2023, 59, 6; art. no. 176420
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Chalcopyrite leaching by amino acid solutions in the presence of hydrogen peroxide
Autorzy:
Nurtazina, Nargiza
Uvarov, Nikolai
Azhigulova, Ryskul
Tyapkin, Pavel
Powiązania:
https://bibliotekanauki.pl/articles/2175441.pdf
Data publikacji:
2022
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
chalcopyrite
amino acid leaching
glycine
betaine
lysine
Opis:
It is demonstrated that amino acids such as glycine, betaine, and lysine may be applied as selective copper leaching agents in the process of hydrochemical oxidation of chalcopyrite at atmospheric pressure and in the temperature range 25÷65 °C. The advantage of the proposed method is its relative environmental friendliness. Solid samples of the initial mineral and leached chalcopyrite residues were analyzed by X-ray diffraction analysis, and Mössbauer and Raman spectroscopy. The results of the atomic absorption analysis showed that copper's extraction efficiency increased when the experiment's duration was raised and when the process temperature was higher. The leaching ability of amino acids was evaluated by the specific leaching rate of chalcopyrite in these reagents. Amino acid leaching was thought to be mainly due to the complexation of copper (II) glycinates, copper (II) betainates and copper (II) lysinates. This reaction can be enhanced by adding hydrogen peroxide to the system as an oxidant. It was determined that glycine was more effective as a leaching agent than betaine and lysine. Based on experimental data, it was assumed that the most possible mechanism is selective copper leaching due to the formation of chalcopyrite-based solid solution Cu1-XFeS2.
Źródło:
Physicochemical Problems of Mineral Processing; 2022, 58, 6; art. no. 157067
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characterization and treatment of clayey waste using a sulfuric acid roasting-water leaching process for the extraction of lithium
Autorzy:
Obut, Abdullah
Aktosun, Zeynep
Girgin, İsmail
Deveci, Hacı
Yörükoğlu, Abdulkerim
Powiązania:
https://bibliotekanauki.pl/articles/2146902.pdf
Data publikacji:
2022
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
Kırka boron plant
lithium
smectite
sulfuric acid roasting
water leaching
Opis:
In this study, a detailed characterization of the clayey waste of the Kırka boron plant was undertaken before the development of a sulfuric acid roasting-water leaching process for the extraction of lithium from this waste. The effects of roasting temperature (650-800°C) and sulfuric acid/waste ratio (90-260 kg H2SO4/1000 kg waste on a dry basis) on the extraction of lithium were investigated. By roasting the waste sample, which contained 0.37% Li2O with dolomite, smectite and borax as the main phases, at temperatures between 650°C and 800°C in the absence of sulfuric acid as the additive, CaMgSiO4 was found to form as the dominant phase after the decomposition of dolomite and smectite present in the sample. On the other hand, the X-ray diffraction analyses of the waste sample subjected to sulfuric acid treatment without roasting showed the in-situ formation of various hydrated calcium sulfate phases for all sulfuric acid/waste ratios tested. Besides, at the highest acid/waste ratio of 260, a hydrated magnesium sulfate phase was also identified in the sample. The application of the sulfuric acid roasting-water leaching process under the optimum roasting temperature of 750°C and the acid/waste ratio of 180 was found to lead to a lithium extraction of 85.7%. The applied sulfuric acid roasting-water leaching process appeared to be an attractive process with its attributes including low roasting temperature, high extraction percentage and no requirement for gypsum as the external sulfation agent.
Źródło:
Physicochemical Problems of Mineral Processing; 2022, 58, 4; art. no. 149635
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study on the mechanism and kinetics of sulfuric acid leaching scandium from rich scandium anatase
Autorzy:
He, Fei
Gao, Likun
Chen, Long
Rao, Bing
Shen, Hairong
Peng, Kebo
Gao, Guangyan
Powiązania:
https://bibliotekanauki.pl/articles/2146896.pdf
Data publikacji:
2022
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
anatase ore
sulfuric acid
leaching
kinetics
scandium
Opis:
Scandium and its compounds have excellent properties, and are widely used in cutting-edge fields such as optics, electronics, and alloys. Thus, scandium is an important strategic metal. However, scandium is extremely sparsely distributed in the earth's crust, rarely occurs as an independent mineral, and requires a complex recovery process. Therefore, the study of the extraction of scandium is of great practical significance. This study examined the leaching test and kinetics of scandium under the acid leaching system of refractory anatase ore. Under appropriate two-stage countercurrent leaching conditions, the first stage of the particle size of fraction of -0.074 mm 82.6%, initial H2SO4 concentration of 6 mol/L, leaching temperature of 100 °C, acid/solid ratio of 3 ml/g, stirring speed of 300 rpm, and leaching time of 50 min; and the second stage of the initial H2SO4 concentration of 11 mol/L, leaching temperature of 150 °C, acid/solid ratio of 4 ml/g, stirring speed of 300 rpm, and leaching time of 50 min, a scandium leaching rate of 96.98% was achieved. The kinetics of scandium leaching conformed to a shrinking-core model, and sulfuric acid concentration and temperature were the most important parameters affecting the scandium leaching rate. The kinetic analysis of scandium leaching at different sulfuric acid concentrations showed that as the concentration increased, the sulfuric acid leaching of scandium changed from being chemical reaction-controlled to internal diffusion-controlled, and the apparent reaction order was 1.2429. The kinetics of scandium leaching at different temperatures showed that the sulfuric acid leaching of scandium was reaction-controlled and the apparent activation energy was 42.21 kJ-mol-1.
Źródło:
Physicochemical Problems of Mineral Processing; 2022, 58, 3; art. no. 146171
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A study on the dissolution kinetics of iron oxide leaching from clays by oxalic acid
Autorzy:
Arslan, Volkan
Powiązania:
https://bibliotekanauki.pl/articles/1447278.pdf
Data publikacji:
2021
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
clay
physico-chemical characterization
chemical leaching
oxalic acid
dissolution kinetics
activation energy
Opis:
Clay is widely used in a number of industries due to its special properties like fine particle size, brightness and whiteness, chemical inertness, platy structure, etc. In this study, the general characteristics of clays have been investigated by XRF, XRD, FT-IR, TG-DTA and SEM. The presence of iron as an impurity decreases its commercial value due to giving unwanted colors to clay mineral. Therefore, the dissolution capacity of clay ore was investigated by oxalic acid leaching. Under optimized leaching conditions (0.8 M oxalic acid concentration, 85°C reaction temperature, 1.75 ambient pH, 106+75 µm particle size, 15% w/v solids concentration and 150 min. leaching time) with 250 rpm stirring, 83.90% of $Fe_2O_3$ was removed. The amount of iron oxide, the main impurity in the clay, has been reduced from 2.70 to 0.40%. The iron dissolution kinetics was mainly controlled by internal diffusion control of shrinking core model and activation energy, $E_a$, of 26.29 kJ/mol was obtained for the process. The results also showed that the studied clays have adequate characteristics for ceramics industry, earthenware and porcelain production.
Źródło:
Physicochemical Problems of Mineral Processing; 2021, 57, 3; 97-111
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An experimental study of removing impurity from a quartz ore by microbial flotation-acid leaching
Autorzy:
Zhu, Jujian
Dai, Shujuan
Li, Pengcheng
Yang, Shuyong
Powiązania:
https://bibliotekanauki.pl/articles/1448443.pdf
Data publikacji:
2021
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
quartz purification
flotation
acid leaching
waste bacteria
Opis:
The purity of a quartz ore is relatively low at a $SiO_2$ content of 97.18%, and the main impurity in the ore is $Fe$, $Al$, and $Ca$ bearing minerals. The main component in an industrial waste bacteria (WJ) is polysaccharides, which may be used as depressors for inhibiting iron minerals in quartz flotation. Moreover, WJ belongs to microbial inhibitors because it is mainly composed of bacteria. As a result of this study, a concentrate grade of 99.88% at recovery over 80% was obtained under the condition of 2000 g/Mg WJ dosage, a grinding fineness of 70% -0.074 mm, pH 11.7, 400 g/Mg $CaCl_2$, and 800 g/Mg $NaOL$ in the flotation experiments for the quartz ore. Moreover, a $SiO_2$ grade of 99.97% at a recovery of 68.85% was obtained at an acid dosage of 40 kg/Mg by using mixed acid of $H_2SO_4$, $HCl$, $HNO_3$, and $HF$ in mass ratios of 20%, 30%, 20%, and 30%, respectively, in subsequent acid leaching of the quartz flotation concentrate. Zeta potential analysis before and after the interaction of quartz and hematite with WJ showed that WJ increased the zeta potential of hematite significantly but had little impact on the zeta potential of quartz, indicating stronger adsorption of WJ on hematite than on quartz. FTIR analysis showed that there exist not only –$COOH$, –$CH_2$–, and –$CH_3$, which are the functional groups of starch but also $NH_2$ and –$C=O-NH$– in WJ. The $NH_2$ and –$C=O-NH$– in WJ are the important groups for adsorption, so the depressing effect on hematite was better for WJ than starch.
Źródło:
Physicochemical Problems of Mineral Processing; 2021, 57, 1; 18-28
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental and kinetic study of zinc leaching from metallurgical slag by 5-sulfosalicylic acid
Autorzy:
Wang, Long
Gao, Hanyu
Song, Shimin
Xue, Na
Zhang, Jinxia
Yang, Siyuan
Liu, Cheng
Powiązania:
https://bibliotekanauki.pl/articles/1447397.pdf
Data publikacji:
2021
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
zinc metallurgical slag
5-sulfosalicylic acid
leaching kinetics
resource recover
Opis:
As an organic acid with the characters of low corrosivity and extensive source, 5-sulfosalicylic acid (5-SSA) was firstly utilized as a potential leaching reagent for the recovery of zinc from metallurgical slag. Effects of stirring speed, leaching temperature, 5-SSA concentrations and size fraction on the leaching zinc leaching rate were investigated. A zinc leaching efficiency of 94.2% was achieved under the appropriate operating conditions (450 rpm of stirring speed, 50 ℃ of leaching temperature, 0.3 mol/L of 5-SSA concentration and d90=65 µm of size fraction), indicating that 5-SSA was an excellent leaching reagent of zinc oxide. SEM-EDS and specific surface aperture analyzer further reveal the well-developed micropores and cracks from zinc metallurgical slag, which could be assigned to the removal of zinc oxide encapsulated in the sample. In addition, the leaching kinetics of zinc metallurgical slag in the 5-SSA was studied. It was found that the surface chemical reaction model satisfactorily predicted the zinc leaching rate. A reaction kinetic equation was finally established for the zinc leaching rate.
Źródło:
Physicochemical Problems of Mineral Processing; 2021, 57, 3; 8-20
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Leaching of coal by trioxoboric acid for coal clearing
Autorzy:
Bilgin, Oyku
Hacıfazlıoğlu, Hasan
Sert, Dilara
Powiązania:
https://bibliotekanauki.pl/articles/2146861.pdf
Data publikacji:
2021
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
trioxoboric acid
coal beneficiation
leaching
work index
Opis:
Trioxoboric acid (H3BO3) is a white weakly soluble acid produced from boron minerals. This acid type was used for the first time in this study for ash and sulfur removal from coal. Ash and sulfur are the most important impurities in the content of coal and have significant effects on environmental pollution. It is possible to remove ash and sulfur by H3BO3 leaching. However, there have not been enough studies in this area and the performance of trioxoboric acid has not been fully demonstrated. In this study, leaching performance of trioxoboric acid and other strong acids (hydrofluoric, hydrochloric and sulfuric acids) has been demonstrated. Trioxoboric acid removed ash and sulfur from coal by 41.18% and 32.16%, respectively. This acid can compete especially with hydrochloric and sulfuric acid in sulfur removal. However, hydrofluoric acid provided the best results in ash and sulfur removal.
Źródło:
Physicochemical Problems of Mineral Processing; 2021, 57, 5; 129--136
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Non-reductive acidic leaching as a method for recovery of zinc and manganese from Zn-C and Zn-MnO2 battery waste
Autorzy:
Sobianowska-Turek, Agnieszka
Banaszkiewicz, Kamil
Pasiecznik, Iwona
Marcinkowski, Tadeusz
Urbańska, Weronika
Powiązania:
https://bibliotekanauki.pl/articles/2032912.pdf
Data publikacji:
2021
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
alkaline battery
Mn
Zn
acid leaching
spent battery
bateria alkaliczna
kwaśne ługowanie
bateria zużyta
Opis:
The dynamic growth of mobile technologies is a driving need for portable power sources. The most popular division of electrochemical cells relies on the type of chemical reaction within the cell. Current data coming from the Polish market show that despite the growth in the sale of secondary power sources, zinc-carbon and alkaline batteries are still the most popular. The results of non-reductive acidic leaching of zinc and manganese from the waste batteries stream have been presented. Manganese was leached with almost 100% yield in an experiment with a solid to liquid ratio equal to 4/1, pH of 1.04, and H2SO4 concentration of 72.5 wt. %. High yields were also obtained for zinc recovery from the waste stream (100% for two series with solid to liquid ratio 4/5, pH of 0.80; H2SO4concentration of 37.2 wt. %, and solid to liquid ratio 1/2; pH of 1.01; H2SO4 concentration of 27.3 wt. %). Besides, the quantitative and qualitative analysis of Zn-C and Zn-Mn batteries introduced to the Polish market and waste generated in the years 2010-2018 has been presented.
Źródło:
Environment Protection Engineering; 2021, 47, 2; 17-29
0324-8828
Pojawia się w:
Environment Protection Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Selective extraction of vanadium from vanadium-titanium magnetite concentrates by non-salt roasting of pellets-H2SO4 leaching process
Autorzy:
Luo, Yi
Che, Xiaokui
Wang, Haixia
Zheng, Qi
Wang, Lei
Powiązania:
https://bibliotekanauki.pl/articles/1445902.pdf
Data publikacji:
2021
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
vanadium-titanium magnetite
pellets
selective extraction
sulfuric acid leaching
Opis:
In this work, a novel process of pellet non-salt roasting and H2SO4 leaching was proposed for the selective extraction of vanadium from vanadium–titanium magnetite concentrate. Vanadium can be leached but the iron impurity was maintained in the pellets. Moreover, the leached pellets can meet the quality requirements of the iron-making process after secondary roasting, realizing comprehensive utilization. The maximal vanadium leaching efficiency was up to 60.3%, whereas 0.17% of the iron impurity was leached. The optimum conditions of pellet roasting and leaching were obtained by single-factor experiments. The X-ray diffraction and scanning electron microscopy–energy disperse X-ray spectrometry analyses showed that the vanadium iron spinel can be oxidized and decomposed into Fe2O3 and vanadate during the roasting process. Given that dilute sulfuric acid can react with vanadate without reacting with Fe2O3 in the leaching process, selective vanadium extraction was realized. This work provides new insights into the industrial production of vanadium–titanium magnetite concentrate involving the direct extraction of vanadium.
Źródło:
Physicochemical Problems of Mineral Processing; 2021, 57, 4; 36-47
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zinc extraction from Ghazouat leach residues by using jarosite method
Autorzy:
Begar, Abdelhakim
Djeghlal, Mohamed El Amine
Ould Hamou, Malek
Powiązania:
https://bibliotekanauki.pl/articles/2016450.pdf
Data publikacji:
2021
Wydawca:
Politechnika Wrocławska. Wydział Geoinżynierii, Górnictwa i Geologii. Instytut Górnictwa
Tematy:
sphalerite
Zn
zinc
acid leaching
leaching residue
extraction
Opis:
In this paper, it was aimed to select and propose a feasible as well as an applicable method, for the extraction of zinc that was present in the disposed GHAZOUAT leach residues having 17.82 wt. % Zn and 20.82 wt. % Fe. After the determination of the components of the residue, the acid leaching was performed to reclaim Zn sequentially. The acid leaching experiments were carried out for Zn extraction by controlling acid concentration, reaction duration and temperature. At the optimum conditions, 240 g/L H2SO4 at 90 °C for 210 min, 80% of initial iron content was removed, and the resultant overall zinc extraction was usually superior than 96%.
Źródło:
Mining Science; 2021, 28; 117-126
2300-9586
2353-5423
Pojawia się w:
Mining Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of oxalic acid as an efficient leaching agent of aluminum from industrial waste
Autorzy:
Pospiech, Beata
Warzecha, Marek
Powiązania:
https://bibliotekanauki.pl/articles/109904.pdf
Data publikacji:
2020
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
aluminum
leaching
oxalic acid
Opis:
The leaching with acids is one of many methods used for recovery of valuable components from industrial wastes. The processing and neutralization of this type of waste is very difficult due to toxic properties. This work shows the results of aluminum leaching from industrial black dross with oxalic acid depending on temperature, acid concentration, effect of liquid to solid ratio (L/S) and time process. The oxalic acid has not been used so far for processing of aluminum black dross. The main purpose of this work was to determine the optimal conditions of this process. The results show that the maximum leaching efficiency of aluminum (75.2 %) was obtained with a liquid to solid ratio of 20:1 using 0.5 mol·dm-3 oxalic acid at 75 °C for 3 h.
Źródło:
Physicochemical Problems of Mineral Processing; 2020, 56, 2; 264-270
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Jiroft refractory manganese ore leaching using oxalic acid as reducing agent in sulfuric acid solution
Autorzy:
Sobouti, Arash
Shafaat, Niosha
Abdollahzadeh, Ali A.
Powiązania:
https://bibliotekanauki.pl/articles/110395.pdf
Data publikacji:
2020
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
manganese
oxalic acid
sulfuric acid
leaching
optimization
Jiroft
Opis:
Leaching process of Jiroft refractory manganese ore was investigated. The effects of operating parameters such as liquid to solid ratio, pulp temperature, sulfuric acid concentration, and oxalic acid concentration were studied and the optimization was done through the response surface methodology (RSM) based on central composite design (CCD) model. The recoveries of Mn, Fe and Si were selected as response of design. The optimum condition was determined by ANOVA, indicating that the liquid to solid ratio, oxalic acid concentration and pulp temperature for Mn recovery and liquid to solid ratio, pulp temperature and sulfuric acid concentration for Fe recovery and liquid to solid ratio for Si recovery were the most effective parameters, respectively. Under the optimum conditions of liquid to solid ratio= 11.8%, pulp temperature= 700 C, sulfuric acid concentration= 40 g/L and oxalic acid concentration= 35 g/L, 71.1%, 4.67% and 0.6% of Mn, Fe and Si were recovered, respectively.
Źródło:
Physicochemical Problems of Mineral Processing; 2020, 56, 2; 374-385
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Leaching kinetics of iron from coal-series kaolin by oxalic acid solutions
Autorzy:
Shao, Hui
Ji, Mengjiao
Yu, Mingming
Powiązania:
https://bibliotekanauki.pl/articles/1449978.pdf
Data publikacji:
2020
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
coal-series kaolin
leaching kinetics
iron removal rate
oxalic acid
Opis:
Removal of iron from coal-series kaolinite and its kinetics by chemical leaching were investigated in this paper. The optimal removal rate of iron reaches 29.09% (the content of $Fe_2O_3$ decreased from 0.55 to 0.39%) under the conditions of 100 °C, 0.4 M $C_2H_2O_4$, and liquid-to-solid ratio of 4 cm3/g for 120 min. The leaching process was successfully described by the Avrami model and mainly controlled by internal diffusion control of shrinking core model, the apparent activation energy is 18.46 kJ/mol. The experimental results were consistent with the internal diffusion control of shrinking core model, improving acid concentration and leaching temperature could promotes the removal of iron from coal-series kaolin.
Źródło:
Physicochemical Problems of Mineral Processing; 2020, 56, 1; 134-146
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
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