COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
·
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
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2025
·
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
·
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
CHEMICAL PAPERS
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2019
·Vol. 73
·期 8
·1863-1869
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IF 1.246
Zhuang Huajian,Wang Chan,He Fufeng,Song Qijun
Brass is a metallic alloy that is made of copper and zinc and has a gold-like appearance. Tin coating could endorse the brass with yellowish up to silver-white color and improve its surface durability. In the present work, electroless plating of tin on the brass surface was investigated aiming to obtain a stable and controllable colored surface. In the presence of thiourea, the open circuit potential of brass (− 0.652 V) is more negative than that of tin (− 0.532 V), which makes the deposition of tin on brass feasible. The surface morphology and composition of the coatings were characterized by scanning electron microscope and energy dispersive spectrometer and the results indicated that a large number of tin clusters were formed on the brass surface. The amount of tin clusters determined the color of the coated surface, which can be facilely tuned by the plating time. The UV/Vis diffuse reflectance spectra were used for monitoring the changes of color at different plating time. The results show that there is a good linear correlation ( R 2 = 0.9948) between the absorbance and the plating time, which can be used to control the extent of tin plating on brass. Finally, the cross-cut test showed that the Sn particles were firmly coated on the brass substrate.
研究领域:
材料科学
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电化学
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产品关联
DOI
高影响因子
Minerals
·
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
MOLECULES
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2023
·Vol. 28
·期 18
·6509
·
IF 4.6
Yanbiao Zhou,Qingqing Ye,Yongjun Han,Guoxu He,Changdong Chen
By taking advantage of typical dealloying and subsequent aging methods, a novel homogeneous porous brass with a micro/nano hierarchical structure was prepared without any chemical modification. The treatment of commercial brass with hot concentrated HCl solution caused preferential etching of Zn from Cu62Zn38alloy foil, leaving a microporous skeleton with an average tortuous channel size of 1.6 μm for liquid transfer. After storage in the atmosphere for 7 days, the wettability of the dealloyed brass changed from superhydrophilic to superhydrophobic with a contact angle > 156° and sliding angle < 7°. The aging treatment enhanced the hydrophobicity of the brass by the formation of Cu2O on the surface. By virtue of the opposite wettability to water and oil, the aged brass separated surfactant-stabilized water-in-oil emulsions with separation efficiency of over 99.4% and permeate flux of about 851 L·m−2·h−1even after recycling for 60 times. After 10 times of tape peeling or sandpaper abrasion, the aged brass maintained its superhydrophobicity, indicating its excellent mechanical stability. Moreover, the aged brass still retained its superhydrophobicity after exposure to high temperatures or corrosive solutions, displaying high resistance to extreme environments. The reason may be that the bicontinuous porous structure throughout the whole foil endows stable mechanical properties to tolerate extreme environments. This method should have a promising future in expanding the applications of alloys.Keywords:dealloying;porous brass;Cu2O;superhydrophobic;stability
研究领域:
材料科学
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表面工程
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
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2025
·
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
·
2024
·
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
Coatings
·
2022
·Vol. 12
·期 11
·1729
·
IF 3.236
Cong-Cong Luan,Yu-Ping Zhang,Cheng-Xing Cui,De-Liang Chen,Yuan Chen,Meng-Jun Chen
In this paper, a novel pH-responsive brass mesh modified by 3-mercaptobenzoic acid (MBA) and 2-naphthalenethiol (NPT) was demonstrated via a facile chemical etching method followed by surface modification. The smart wettability was dependent on the assembled MBA and NPT with suitable thiol proportions. The on–off control of water penetrating intelligently into the nanostructured brass mesh substrate was carried out by the pH change in the outside environment. The brass mesh modified with XNPT= 0.4 (mole fraction of NBT in the mixed solution) exhibited the strongest pH responsivity from superhydrophobicity to superhydrophilicity. Furthermore, the resulted Janus membrane (JM) fabricated by the integration of a smart brass mesh and hydrophobic Ni foam could be used as a water diode in air and liquid systems. Unidirectional penetration for the water droplet was realized by the resulting smart JM with a hydrophobic upper layer and a pH-responsive layer below.Keywords:smart material;brass mesh;3-mercaptobenzoic acid;2-naphthalenethiol;Janus membrane
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
CORROSION SCIENCE
·
2024
·
IF 7.4
Kangwei Gongsun,Xiang Gao,Kanglu Feng,Boyu Yuan,Juan Qiu,Chunchao Chen,Chen Sang,Chao Wang,Houyi Ma
A nanoscale ternary layer-by-layer self-assembly (LbL) thin film was fabricated on brass via a simple dipping method. Dual driving force of intermolecular interactions and coordination realized the high homogeneous dispersion of Ce 3+ , thereby improving the controlled distribution and release of inhibitors. Compared to previous nanometer-thick conversion coatings , ternary LbL film exhibited excellent multifunctional corrosion protection . The maximum strengthening reached 496.8 % in impendence, and corrosion inhibition efficiency remained 95.0 % after a 10-day exposure in 3.5 wt% NaCl. These improvements originated from dynamic barrier effect by crosslinked gel film of PA/PAH and the surface passivation through interface deposition of Ce species.
研究领域:
材料科学
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表面工程
·
腐蚀与防护
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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）