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    Wyświetlanie 1-13 z 13
    Tytuł:
    Micro-FTIR analysis to study the change in surface chemistry after addition of collectors and their effect on coal hydrophobicity
    Autorzy:
    Wang, W.
    Kumar, A.
    Holuszko, M. E.
    Mastalerz, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/110471.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    hydrophobicity
    collectors
    micro-FTIR
    Opis:
    In this study, the micro-FTIR analysis was used to investigate in-situ surface properties of coal, and was directly correlated to coal hydrophobicity, as measured by the contact angle before and after the addition of collectors, to understand their suitability for flotation. Three different collectors, diesel, pine needle oil and dodecyl trimethyl ammonium bromide (DTAB) were tested. The micro-FTIR technique provided a semi-quantitative analysis of functional groups present on the coal surface exactly where the contact angle was measured and provided a visualization of collector adsorption on specific areas of coal and associated changes in coal surface properties. This analysis could lead to a smarter way of using process design in terms of reagent selection for coal flotation to obtain a product of desired petrographic composition, which would especially be useful for coking coals. This study presents a work in progress for developing a procedure for a quick pre-selection of collectors for coal flotation based on coal surface properties.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2018, 54, 4; 1292-1302
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparison of anionic, cationic and amphoteric collectors used in pyrite flotation
    Autorzy:
    Bulut, Gülay
    Sirkeci, A. A.
    Arı, Beril
    Powiązania:
    https://bibliotekanauki.pl/articles/1446764.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    flotation
    pyrite
    amine
    collectors
    xanthate
    Opis:
    In this study, flotation tests were conducted with purified pyrite and ore samples. The collectors employed were anionic and cationic type such as potassium ethlyl-amyl xanthate, Tomamine M73 and Resanol Bal. According to the flotation tests, it was found that pyrite floated at low pH and depressed at high pH values with xanthates. On the other hand, in the case of cationic collectors which are Tomamine M73 (alkyl ether amine, an amphoteric surfactant) and Resanol Bal (N-3-tridecyloxy propyl 1-3 diamine, branched acetate) pyrite floated at high pH values. It was shown that amine type collectors could be efficient to selectively float pyrite from chalcopyrite at alkali pH ranges in the case of ore samples.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2021, 57, 5; 15-22
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Tetrahydrofurfuryl-functionalized polystyrene nanoparticles as collectors for low rank coal flotation
    Autorzy:
    An, Maoyan
    Liao, Yinfei
    Cao, Yijun
    Zhao, Yifan
    Qiu, Yuliang
    Powiązania:
    https://bibliotekanauki.pl/articles/109357.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    nanoparticles
    low rank coal
    flotation
    collectors
    Opis:
    In this paper, tetrahydrofurfuryl-functionalized polystyrene nanoparticles (TFPNs) were evaluated as collectors in low-rank coal flotation. A series of TFPNs were prepared by immobilizing tetrahydrofurfuryl groups onto the surface of polystyrene nanoparticles (PNs), and further characterized in terms of their size, shape, surface charge and surface functionalization group concentration (SFGC). The coal flotation performance using TFPNs was compared to that using PNs and diesel oil (DO). The interaction mechanisms between TFPNs and low-rank coal were also discussed. The results show that TFPNs gave higher recovery than that given by PNs and DO. Smaller TFPNs were more effective flotation collectors. The recovery of TFPNs increased firstly and then decreased with SFGC. TFPNs can specifically deposit onto the low-rank coal particles with the hydrogen bonding function between tetrahydrofurfuryl groups and oxygen-containing functional groups, and promote low-rank coal flotation by increasing the hydrophobicity and roughness of coal particle surface with the adsorbed TFPNs. It was demonstrated that TFPNs introduced a new class of collectors for low rank coal flotation.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2019, 55, 2; 516-527
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Multi-stage flotation of colored impurities from albite ore in the presence of some cationic and anionic collectors
    Autorzy:
    Kilinc-Aksay, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/109851.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    albite
    colored impurities
    collectors
    multi-stage flotation
    Opis:
    Mica and heavy minerals containing iron oxides and titanium oxides such as rutile and sphene are floated using cationic and anionic collectors, respectively. In this study, separation of colored impurities including mica and heavy minerals from the albite ore obtained from the Aydin region in Turkey was investigated by multi-stage flotation. The effects of the new cationic and various anionic collectors and their dosages in either acidic or natural circuits were investigated to upgrade the albite ore. In the case of the flotation stage of mica minerals, the results obtained from this study showed that the stearylamine collector (Flotigam-S) gave the best performance and an albite concentrate with 7.58% Na2O grade was produced with 81.40% Na2O recovery at 400 g/Mg Flotigam-S under the acidic condition at pH 3. Additionally, in the heavy minerals flotation stage, the use of Na-oleate in the natural circuit (pH 6) was the most effective for removal of iron and titanium oxides, and an albite concentrate with 0.042% Fe2O3 and 0.061% TiO2 grades was produced with 91.89% Fe2O3 and 88.56 %TiO2 recoveries, respectively, with the use of 900 g/Mg Na-oleate. Under the optimum conditions, the colored impurities containing mica minerals, iron oxides and particularly sphene as well as rutile could be effectively removed from the albite ore in the presence of Flotigam-S and Na-oleate collectors by multi-stage flotation.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2018, 54, 2; 220-227
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    QSAR study of amine collectors for iron ore reverse flotation
    Autorzy:
    Wang, Benying
    Xu, Xinyang
    Duan, Hao
    Wang, Xinyang
    Powiązania:
    https://bibliotekanauki.pl/articles/110929.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    QSAR
    separation efficiency
    reverse flotation
    amine collectors
    Opis:
    In order to reveal the relationship between flotation behaviors of collectors and their structures, quantitative structure–activity relationship (QSAR) study about separation efficiency of quartz from hematite using amine collectors was performed. The genetic function approximation (GFA) algorithm was applied to generate the correlation models and model with acceptable R2 and Rcv2 (cross validated R-squared) correlation coefficients (R2=0.9666, Rcv2=0.9201) was developed. The model revealed that the Lowest Unoccupied Molecular Orbital (LUMO) energy of the molecule, the charge of nitrogen and the electronegativity of polar group were the major factors that affected the separation efficiency of collectors. The higher nitrogen charge, the larger electronegativity of polar group and the more positive of LUMO energy of amine collectors were, the higher separation efficiency would be.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2019, 55, 5; 1059-1069
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evolution of ideas towards the implementation of nanoparticles as flotation reagents
    Autorzy:
    Legawiec, Krzysztof Jan
    Polowczyk, Izabela
    Powiązania:
    https://bibliotekanauki.pl/articles/1450540.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    nanoparticles
    nanocelluloses
    polystyrene
    nano-collectors
    green flotation chemicals
    Opis:
    The paper discusses an idea of nanoparticles application to the flotation process. Due to the growing awareness of the environmental impact of industry and legal restrictions, the directions of research on new chemicals used in mineral processing, as well as in the other branches of industry are changing. The flotation reagents of the future should be, or are expected to be, readily biodegradable, but also their products should be harmless to the environment. A review of the works presented here presents an overview of the state-of-the-art application of nanostructures from early reported polystyrene nanoparticles to the most promising cellulose nanostructures which can be successfully adapted to the desired amphiphilicity parameters through simple functionalization. Limitations on the use of such nano-sized entities related to control aggregation in the flotation process and the ability to adsorb at interphase boundaries are also presented. Overall, nanoparticles can become universal flotation collectors and also an alternative to conventionally used hydrocarbon-based reagents.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2020, 56, 6; 280-289
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Flotation and molecular dynamics simulation of muscovite with mixed anionic/cationic collectors
    Autorzy:
    Bai, Yang
    Li, Caixia
    An, Hongyun
    Wang, Guoliang
    Zhao, Xin
    Zhang, Jinqi
    Powiązania:
    https://bibliotekanauki.pl/articles/110125.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    muscovite
    mixed anionic/cationic collectors
    flotation
    molecular dynamics simulation
    Opis:
    In this study, three kinds of anionic collectors (sodium oleate (NaOl), sodium dodecyl sulfonate (SDS) and naphthenic acid (NA)) were used in combination with dodecylamine (DDA) to investigate the flotation behavior of muscovite under the action of different mixed anionic/cationic collectors, and their mechanisms for adsorption on the muscovite (001) Surface were clarified using molecular dynamics simulations. The flotation results indicated that different mixed anionic/cationic collectors could improve the recovery of muscovite to varying degrees, but the optimum molar ratio of anionic collectors to DDA and the optimum mixed collector dosage were different. Molecular dynamics simulations showed that the mixed anionic/cationic collectors could significantly increase the hydrophobicity of the muscovite, as evidenced by the decrease in the calculated water molecule density on the muscovite surface and the diffusion coefficient of water molecules at the solid/liquid interface. The interaction between the amino group and the polar group of anionic collectors reduced the electrostatic repulsion between DDA cations and theoretically increased the adsorption capacity of the mixed anionic/cationic collectors on the muscovite surface. Moreover, DDA/NA and DDA/NaOl could improve the calculated carbon atom density on the muscovite surface, which enhanced the hydrophobic association between nonpolar carbon chains, thus further achieving an enhanced flotation performance.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2020, 56, 2; 313-324
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Degradation mechanism study of amine collectors in Fenton process by quantitative structure-activity relationship analysis
    Autorzy:
    Wang, X.
    Liu, W.
    Duan, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/110363.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    amine collectors
    Fenton process
    QSAR
    degradation mechanism
    quantum chemistry
    Opis:
    In this study, advanced oxidation processes (AOPs), Fenton process, was applied to degrade ten amine collectors. The experimental results indicated that most of the tested amines could be removed rapidly and effectively at pH=4, while the degradation of quaternary ammonium compounds was less than others. To research the Fenton oxidation process, the degradation-rate constants of amine collectors were calculated by the pseudo-second order kinetic model, then which was used as the dependent variable to establish a quantitative structure activity relationship (QSAR) model. Meanwhile, 16 molecular structure descriptors and quantum mechanical parameters for amine collectors were simulated and analyzed by using Materials Studio software. The optimum QSAR model was established based on the partial least squares regression (PLS) method and confirmed by the statistics analysis. The model revealed that hydrogen bond acceptor (HBA) and the maximum values of electrophilic attack in C atom sites (f(-)c) were the major effect factors for the degradation-rate constants of amine collector.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2018, 54, 3; 713-721
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of mixed collectors on quartz-feldspar by fluorine-free flotation separation and their interaction mechanism : a review
    Autorzy:
    Li, Peiyue
    Ren, Zijie
    Xie, Enjun
    Duan, Shutong
    Gao, Huimin
    Wu, Jianxin
    He, Yuhao
    Powiązania:
    https://bibliotekanauki.pl/articles/1446562.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    quartz
    feldspar
    crystal structure
    flotation
    mixed collectors
    environmentally friendly
    Opis:
    Quartz and feldspar are usually exist in symbiosis in nature, and they are difficult to be separated effectively by conventional physical methods owing to their similarities in crystal structures and surface characteristics. Flotation is the most resultful method, and especially, flotation with hydrofluoric acid (HF) is the most efficient way. Because HF may cause serious environmental and health problems, the effective and environmentally friendly separation of quartz and feldspar remains a formidable challenge. The crystal structure, surface broken bonds, surface energy, and solid–liquid interface properties of quartz and feldspar are investigated in this paper. In particular, some types of mixed cationic/anion collectors and their interaction mechanism on the quartz and feldspar surfaces with acidic, alkaline, and neutral media in the absence of fluorine are discussed, and the grade and scheme of quartz and feldspar for the practical application are illustrated. This review proposes concrete research approaches and provides perspectives for the advanced processing of quartz and feldspar in an environmentally friendly and economical way.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2021, 57, 4; 139-156
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Proposition of a bubble-particle attachment model based on DLVO van der Waals and electric double layer interactions for froth flotation modelling
    Autorzy:
    Buchmann, Markus
    Öktem, Gülce
    Rudolph, Martin
    Boogaart, K. Gerald van den
    Powiązania:
    https://bibliotekanauki.pl/articles/2146873.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    attachment
    froth flotation
    Hamaker constant
    surfactants
    collectors
    hydrophobic interaction
    Opis:
    The attachment of bubbles and particles represents one of the sub-processes in froth flotation among others (e.g. collision and detachment). The main interactions present at short distances in such a bubble-particle system are the van der Waals and electrostatic double layer interactions combined in the DLVO theory. In this study, the special features of the attachment process were discussed with a focus on flotation. For the van der Waals interactions, the Hamaker constants were calculated with the help of Lifshitz´ macroscopic theory as a function of the separation distance for specific material combinations. A specific material system (PbS-Water-Air) was used to demonstrate the implementation of bubble-particle attachment of the proposed modelling framework. The effects of additional surfactant/collector and air layers on the solid interface were presented. This framework of layered systems showed that the sign of van der Waals interaction could be turned from repulsive to attractive without the need to extend the DLVO theory. The thickness of the layer as a function of collector adsorption between a particle and a bubble is suggested as a modelling parameter in bubble-particle attachment efficiency.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2022, 58, 5; art. no. 154812
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Exploration on flotation behavior of galena in seawater and related mechanism
    Autorzy:
    Song, Ningbo
    Sun, Chuanyao
    Yin, Wanzhong
    Yao, Jin
    Yang, Bin
    Powiązania:
    https://bibliotekanauki.pl/articles/2146915.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    high-sulfur magnetite
    pyrrhotite flotation
    magnetic separation
    mixed collectors
    Opis:
    The utilization of seawater in mineral flotation is the future development trend because of the shortage of fresh water resources. However, at present, the flotation behavior and mechanism of galena in seawater are not clear. Therefore, this paper comprehensively carried out the effect mechanism of seawater on the flotation of galena. Micro-flotation results illustrated that the recovery of galena was higher in deionized water than that in 5×10-2 mol/L MgCl2 solution, 1×10-2 mol/L CaCl2 solution and seawater. Contact angle determination and Zeta potential distribution measurements showed that hydrophilic substances adsorbed on the surface of galena under alkaline conditions. X-ray photoelectron spectroscopy (XPS) analysis further indicated that these substances were hydroxides precipitates, carbonate precipitates and hydroxyl complexes formed by divalent magnesium and calcium ions, which prevented the adsorption of collector on mineral surface. As a result, the galena recovery declined in 5×10-2 mol/L MgCl2 solution, 1×10-2 mol/L CaCl2 solution and seawater.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2022, 58, 4; art. no. 151524
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study on recovery of iron and sulfur from high-sulfur magnetite ore
    Autorzy:
    Zhao, Yongqiang
    Zhou, Wen-tao
    Sun, Tichang
    Ahmadzai, Asadullah
    Powiązania:
    https://bibliotekanauki.pl/articles/2146914.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    high-sulfur magnetite
    pyrrhotite flotation
    magnetic separation
    mixed collectors
    Opis:
    In this paper, to produce a saleable magnetite concentrate with a sulfur level below 0.20% and recover sulfur concentrate, flotation and magnetic separation tests were undertaken. Results showed that the optimum conditions of flotation were established as follows: grinding fineness of 90% particles passing 0.074mm, pH 6, 400 g/t of CuSO4, and 400 g/t of combined collectors. Under these conditions and magnetic separation, S grade of the magnetite concentrate was reduced from 3.20% to 0.18%, and the Fe grade improved from 57.29% to 71.17%. At the same time a sulfur concentrate with S grade of 38.05% and recovery of 91.32% was also obtained. The XPS results showed that the addition of CuSO4 benefited the formation of hydrophobic Sn2-/S0 and Cu+-xanthate, enhancing pyrrhotite floatability. The flotation separation efficiency could be enhanced using a mixture of collectors, and collector mixture demonstrated three synergetic effects, namely enhanced S recovery, improved adsorption behavior of the collectors and enhanced hydrophobicity of pyrrhotite surface.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2022, 58, 4; art. no. 150889
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of the oxygen-containing functional group on the adsorption of hydrocarbon oily collectors on coal surfaces
    Autorzy:
    Wan, He
    Hu, Xianglin
    Luukkanen, Saija
    Qu, Juanping
    Zhang, Chonghui
    Xue, Jiwei
    Li, Hui
    Yang, Wei
    Yang, Shenghong
    Bu, Xianzhong
    Powiązania:
    https://bibliotekanauki.pl/articles/2146920.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    oxygen-containing functional groups
    hydrocarbon oily collectors
    molecular dynamics simulation
    coal surfaces
    adsorption
    Opis:
    The oxygen-containing functional groups (OCFG) on the coal surface affect the adsorption effect of hydrocarbon oily collectors (HOC). An investigation of the interaction between the HOC and OCFG in the absence and presence of water is conducive to understanding the effect of OCFG type on the adsorption of HOC on the coal surface. In this paper, FTIR analysis was used to analyze the OCFG type of coal surface. The adsorption behavior of HOC on different OCFG surfaces was investigated using molecular dynamics simulation. The results indicated the presence of OCFG such as -OH, -COOH, -C=O, and -COCH3 on the coal surface. In conditions without water, the effect of OCFG on HOC adsorption capability follows the order -COOH > -C=O > -OH > -COCH3. In an aqueous solution, the effect of OCFG on HOC adsorption capability follows the order -C=O>-COCH3>-OH>-COOH. Moreover, the hydrophilicity of OCFG is the key factor that affects the adsorption effect of HOC. In other words, the adsorption effect of HOC on the coal surface in an aqueous solution does not depend on the strength of the interaction between the OCFG and HOC in the absence of water, but on the hydrophilicity of the OCFG. The -COOH and -OH on the coal surface are not conducive to the adsorption of HOC onto the coal surface. Masking the -COOH and -OH of the coal surface is beneficial in improving the coal flotation performance with HOC as a collector.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2022, 58, 4; art. no. 149937
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-13 z 13

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