COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
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IF 5.518
Jian Peng,Wei Sun,Haisheng Han,Leming Ou,Jianhua Chen,Yuanjia Luo
Herein, a new and environmentally friendly process scheme containing PGA as depressant and Z200 as collector for chalcopyrite-molybdenite bulk flotation and STG as depressant for chalcopyrite/molybdenite separation flotation was applied to the separation of pyritic Cu-Mo sulfide ore from Daye, Hubei Province, China. The flotation results showed that the new process scheme not only can efficiently achieve the flotation separation of chalcopyrite and molybdenite, but also can reduce the dosage of STG in chalcopyrite/molybdenite separation compared with the traditional process combining CaO and BX. The closed-circuit flotation experiment results further demonstrated this preferable result. Besides, the differences in the adsorption of STG on the chalcopyrite (112) surface in the presence of Z200 and BX were investigated by first-principles calculations at the atomic level. The calculation results showed that the STG adsorption on chalcopyrite (112) surface in the presence of Z200 was easier than that in the presence of BX, and the STG adsorption weakened the Z200 adsorption on chalcopyrite (112) surface, which provides atomic-scale explanations to the less STG dosage in chalcopyrite/molybdenite separation. This new reagent scheme has environmental advantages and great reference value for the separation of other pyritic copper-molybdenum sulfide ores.
研究领域:
矿物学
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材料科学
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环境科学
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产品关联
DOI
高影响因子
JOM
·
2025
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IF 2.3
Che Wenfang,Deng Rongdong,Xiao Shijie,Zhang Jing,Wu Siyuan,Jiao Fen
To address the challenges associated with the agglomeration and encapsulation of chalcopyrite by molybdenite in flotation slurries, which hinder the effective separation of copper and molybdenum, this study investigated the effects of various dispersants on the dispersion behavior of chalcopyrite and molybdenite, along with the underlying mechanisms. Optical microscopy, focused beam reflectance measurements (FBRM), infrared spectroscopy, zeta potential analysis, and other analytical techniques were employed. The results revealed that the dispersion behaviors of chalcopyrite and molybdenite align with the EDLVO theoretical model. At a slurry pH of 12, the dispersant effectively dispersed molybdenite and minimized its agglomeration around chalcopyrite. The dispersive capabilities of the tested dispersants followed the order: sodium carbonate (Na 2 CO 3 ) > sodium hexametaphosphate (SHMP, (NaPO 3 ) 6 ) > sodium silicate (Na 2 O·nSiO 2 ) > ammonium bicarbonate (NH 4 HCO 3 ). Specifically, carbonate ions produced by the hydrolysis of Na2CO3 were chemically adsorbed onto the molybdenite surface, while hexametaphosphate primarily adhered through physical adsorption. This adsorption enhanced the dispersion of molybdenite particles by increasing electrostatic repulsion between them. Mixed ore flotation experiments demonstrated that both Na 2 CO 3 and SHMP significantly reduced the copper grade in the molybdenum concentrate, from 3.95% to 2.69% and 2.67%, respectively.
研究领域:
矿物加工工程
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化学工程
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产品关联
DOI
高影响因子
MINERALS ENGINEERING
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2018
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IF 2.707
Bo Feng,Jinxiu Peng,Wenpu Zhang,Xianghan Ning,Yutao Guo,Wencai Zhang
In the flotation separation of chalcopyrite and talc, depressants are usually added to selectively prevent talc from floating. Commonly used depressants lack selectivity, resulting in the depression of both talc and sulfide minerals. To solve this problem, the role of locust bean gum in the flotation separation of chalcopyrite and talc was studied and its mechanism of talc depression discussed. Single mineral flotation test results showed that both chalcopyrite and talc were floatable in the tested pH range of 3–11 and that locust bean gum depressed the flotation of both minerals; however, locust bean gum showed a strong depressing effect on talc in the pH range of 5–9 at a dosage of 2000 g/t. The results of flotation tests performed on mixed minerals indicated that the use of locust bean gum as a depressant can achieve flotation separation of chalcopyrite from talc. A concentrate of 30.1% Cu was achieved at 88.1% recovery from a feed material containing 15.2% Cu. This was attributed to greater adsorption of locust bean gum on the surface of talc compared with that on the chalcopyrite. Zeta potential and X-ray photoelectron spectroscopy measurements showed that the locust bean gum adsorbed on talc mainly through physical interactions; hydrophobic interactions were considered the main driving force and hydrogen bonds also played a role.
研究领域:
矿物加工工程
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材料科学与工程
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产品关联
DOI
高影响因子
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
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2025
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IF 7.8
Zhi Lei,Hao Tang,Heng Zhang,Yong-Chun Luo,Peng-Fei Xu
The intergrowth phenomenon of chalcopyrite and talc makes the identification of an eco-friendly and efficient depressant crucial for achieving effective separation. In this study, we innovatively employed Ghatti Gum as a talc depressant to improve the flotation separation. The micro-flotation test results demonstrate that, compared to conventional depressants, Ghatti Gum exhibits a stronger depressing effect on talc while maintaining excellent selectivity toward chalcopyrite. Atomic force microscopy (AFM), scanning electron microscopy with energy-dispersive X-ray spectroscopy (SEM-EDS), and transmission electron microscopy (TEM) images confirmed that Ghatti Gum adsorbed selectively on the surface of talc, which significantly altered its surface roughness and elemental composition. In contrast, Ghatti Gum exerts a weaker influence on chalcopyrite. Further analysis through Zeta potential, Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), and density functional theory (DFT) calculations revealed that Ghatti Gum adsorbs onto the talc surface through hydrogen bonds and hydrophobic interactions. Meanwhile, Ghatti Gum has less influence on the elemental composition and floatability of the chalcopyrite surface. In summary, Ghatti Gum emerges as a promising eco-friendly depressant for the flotation separation of chalcopyrite and talc. This discovery not only expands the applications of Ghatti Gum but also provides novel insights for the efficient separation of chalcopyrite from talc.
研究领域:
矿物加工
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材料科学
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表面化学
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产品关联
DOI
高影响因子
POWDER TECHNOLOGY
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2024
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IF 4.5
Zhihao Shen,Qicheng Feng,Shuming Wen,Han Wang,Jing Cao,Zhengyong Song
The separation of polymetallic sulfide ores by flotation is a difficult task in the mineral processing industry. In this investigation, a small-molecule organic compound, mercaptosuccinic acid (MSA), was used as a new depressant for inhibiting galena in chalcopyrite flotation. Micro-flotation and surface wettability tests indicated that MSA pronouncedly weakened the floatability of galena but not chalcopyrite, resulting in marked differences in their flotation recovery. Findings of Fourier transform infra-red (FT-IR) spectroscopy measurements and reagent adsorption trials showed that MSA was strongly adsorbed on galena, resulting in the inability of the collector to effectively interact with galena. Atomic force microscope (AFM) and X-ray photoelectron spectroscopy (XPS) analyses further corroborated that MSA showed a greater affinity for galena than chalcopyrite, this behavior markedly altered the superficial chemical environment of galena. Molecular dynamic simulations (MDS) showed that MSA increased the concentrations of H 2 O molecules on galena, which enhanced the surface hydrophilicity of galena.
研究领域:
矿物加工工程
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表面化学
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产品关联
DOI
高影响因子
Minerals
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2020
·Vol. 10
·期 2
·157
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IF 2.38
Chonghui Zhang,Tingshu He,Wei Chen,Xianzhong Bu,Sen Wang,Xiaozhen Tian
Sodium thioglycolate is a chalcopyrite depressant, but its depressant effect is weak. The paper investigated the effect of CuSO4on the depressant performance of sodium thioglycolate towards chalcopyrite through flotation tests, Zeta potential measurements, X-ray photoelectron spectroscopy (XPS) analyses and Fourier-transform infrared (FTIR) spectra measurements. It was found that copper ions could improve the depressant effect of sodium thioglycolate on chalcopyrite. The results showed that copper ions could adsorb on the surface of chalcopyrite and form mixed copper sulfide and cupric oxides/hydroxides adsorption layers. As a result, the mineral composition on the chalcopyrite surface was changed. With sodium thioglycolate treatment, the Zeta potential and the adsorption sites of chalcopyrite surface were both increased, and the hydrophobic substance Sn2−/S0concentration was decreased. The electrostatic repulsion of chalcopyrite surface with sodium thioglycolate was also decreased, which made the sodium thioglycolate interact with chalcopyrite more easily. The more active sites could adsorb more sodium thioglycolate, which improved the hydrophilia of chalcopyrite. At the same time, the decrease of Sn2−/S0concentration could further improve the hydrophilia of chalcopyrite. The results show that the copper ions could exhibit auxiliary effect with sodium thioglycolate and could further enhance the depressant effect of sodium thioglycolate on the chalcopyrite flotation. This paper provides new insights into the depression of chalcopyrite flotation by sodium thioglycolate.Keywords:flotation;chalcopyrite;sodium thioglycolate;copper ions;depressant
研究领域:
矿物加工工程
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表面化学
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产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
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2025
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IF 5.2
Wanting Yang,Zhuoyue Lan,Xiong Li,Yunchuan Li,Hang Li,Yunxiang Du
To efficiently enrich fine copper-molybdenum ore, a pioneering method was employed by utilizing MCO (trimethyl-pyridin) and kerosene as high-efficiency composite collectors in the flotation process. Micro-flotation and actual ore flotation tests demonstrated that the composite collector manifested superior collection capacity and selectivity compared to using a single collector. Furthermore, the inclusion of kerosene reduced collector consumption, thereby lowering overall reagent costs. TOC test results indicated that the composite collector possesses a high adsorption quantity on the mineral surface. Additionally, contact angle measurements demonstrated that the composite collector significantly enhanced the surface hydrophobicity of chalcopyrite and molybdenite. FT-IR, XPS, and ToF-SIMS analyses were conducted to investigate the adsorption mechanism. The results illustrated that MCO adsorbed to mineral surfaces by forming complexes with Cu atoms in chalcopyrite and Mo atoms in molybdenite, respectively. The primary interaction between kerosene and copper-molybdenum ore involved hydrophobic attraction with kerosene physically adhering to the mineral surface to form hydrophobic aggregates. Hence, this study presented an effective procedural approach for the flotation of fine copper-molybdenum ore.
研究领域:
矿物加工工程
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表面化学
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DOI
高影响因子
MINERALS ENGINEERING
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2024
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IF 4.9
Qiang Zhang,Yongsheng Sun,Guanda Wu,Xinlei Wei,Peng Gao
Chrysocolla is an important refractory copper oxide ore. The sulfidation roasting using pyrite as a sulfidation agent was conducted on the chrysocolla. A copper recovery of 87.31 % was obtained with butyl xanthate. Thermodynamic analysis indicated that the predominant equilibrium product was Cu 2 S. Excessive pyrite dosage resulted in an overproduction of by-products, and a satisfactory equilibrium composition can be obtained at a roasting temperature above 500 °C. The main gas product was SO 2 , with no H 2 S generated. The roasting process involved the dehydration of chrysocolla, forming copper oxides that reacted with S released from pyrite pyrolysis. The sulfidation reaction gradually proceeded from the particle surfaces to the interiors with the gradual S diffusion. Even with satisfactory copper recovery, a significant amount of copper oxides remained within the particles. This was because xanthate primarily adsorbed onto the particle surface, implying that complete copper mineral phase reconstruction may be unnecessary for efficient flotation.
研究领域:
冶金学
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矿物加工工程
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DOI
高影响因子
MINERALS ENGINEERING
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2021
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IF 4.765
Xun Wang,Bing Zhao,Jie Liu,Yimin Zhu,Yuexin Han
In the present study, dithiouracil was employed as the chalcopyrite depressant to selectively change the properties of chalcopyrite surface and separate molybdenite from chalcopyrite. Micro-flotation experiments were carried out to investigate the separation efficiency of dithiouracil on the flotation separation of molybdenite from chalcopyrite. Furthermore, the depression mechanism of dithiouracil was explored at molecular level via zeta potential measurements, fourier transform infrared (FTIR), X-ray photoelectron spectroscopy (XPS) and time-of-flight secondary ion mass spectrometry (ToF-SIMS) analyses. The results showed that dithiouracil strongly depressed chalcopyrite flotation while had less impact on molybdenite flotation, and a satisfactory separation result was acquired by using dithiouracil. Zeta potential measurements and FTIR analyses illustrated that dithiouracil was chemisorbed on chalcopyrite surface. Furthermore, XPS and ToF-SIMS measurements confirmed that dithiouracil could react with Cu atoms on chalcopyrite surface through forming a four membered chelating ring. This paper indicated that dithiouracil can be employed as a high-performance chalcopyrite depressant for the Cu-Mo flotation separation.
研究领域:
矿物加工工程
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表面化学
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DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
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2021
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IF 6.165
Bingqiao Yang,Pengliang Huang,Qing An
A small molecular triazole derivative called AMT (3-amino-5-mercapto-1,2,4-triazole) was explored as a novel and efficient chalcopyrite depressant in the preferential flotation of chalcopyrite from molybdenite. The flotation performances were comprehensively investigated via micro-flotation tests of singe and mixed minerals with and without Cu collector. The adsorption mechanisms were determined in terms of contact angle, adsorption capacity, and zeta potential, Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS) and DFT calculations. Single mineral flotation results illustrated that the AMT selectively depressed chalcopyrite over a wide range of pH values. Particularly, AMT was able to depress chalcopyrite even in the presence of sodium isobutyl xanthate (SIBX). The contact angle, adsorption capacity, zeta potential, and FTIR results suggested that AMT was preferentially adsorbed on chalcopyrite surface, but it barely interacted with molybdenite. XPS tests and DFT calculations demonstrated that AMT was chemically adsorbed on chalcopyrite surface through the hybridization of S (1) and N (1) 2p orbitals of AMT with the Cu (1) 3d orbital. The bonding between S (1) atom and Cu (1) was much stronger than that between N (1) and Cu (1). Thus, AMT exhibited good potential as a novel depressant due to its excellent selectivity and practicability.
研究领域:
矿物加工工程
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化学工程
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材料科学
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产品关联
DOI
高影响因子
Nanomaterials
·
2022
·Vol. 12
·期 9
·1439
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IF 5.719
Ying Yang,Yaya Ding,Jingyu Zhang,Nina Liang,Lizhen Long,Jun Liu
In this work, CZTS particles with a mixed phase of wurtzite and kesterite were synthesized by the solvothermal method. The time-dependent XRD patterns, Raman spectra, SEM, and EDS analysis were employed to study the growth mechanism of CZTS. The results revealed that the formation of CZTS started from the nucleation of monoclinic Cu7S4seeds, followed by the successive incorporation of Zn2+and Sn4+ions. Additionally, the diffusion of Zn2+into Cu7S4crystal lattice is much faster than that of Sn4+. With increasing time, CZTS undergoes a phase transformation from metastable wurtzite to steady kesterite. The morphology of CZTS tends to change from spherical-like to flower-like architecture. The mixed-phase CZTS with a bandgap of 1.5 eV exhibited strong visible light absorption, good capability for photoelectric conversion, and suitable band alignment, which makes it capable to produce H2production and degrade RhB under simulated solar illumination.Keywords:CZTS;wurtzite;kesterite;growth mechanism;photocatalytic performance
研究领域:
材料科学
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化学
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产品关联
DOI
PubMed
高影响因子
MATERIALS RESEARCH BULLETIN
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2023
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IF 5.4
Jia Yao,Jingxuan Liu,Zhenlun Wei,Yubiao Li,Huiqing Zhou,Jinpeng Wang,Wanqing Li,Qingwen Zhang,Xiaoyong Wu
The work provides an efficient method of Tetracycline (TC) treatment by using natural chalcopyrite (NCP) as the photocatalytic activation of peroxymonosulfate (PMS) in aqueous. The results demonstrate that compared to simply NCP or PMS processes, the efficiency of TC removal (100% within 40 min) in the NCP/PMS/Light system was significantly enhanced. The kinetic constants for the NCP, PMS and NCP/PMS/Light systems were 0.0031, 0.010 and 0.1133 min −1 respectively. Finally, the mechanics of TC degradation were researched. The active species (SO 4 •− , •OH, •O 2 − and 1 O 2 ) was the main reason for the degradation of TC. Cycling of metal sites (Cu 2+ /Cu + , Fe 3+ /Fe 2+ ) on NCP improved the activation of PMS to produce more free radicals (SO 4 •− , •OH). As electron acceptor, PMS stimulated the generation of •O 2 − radical, while enhanced the separation of photogenerated electrons and holes and fulfilled the synergistic effect of photocatalysis and PMS.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）