Applied Sciences-Basel
·
2025
·Vol. 15
·期 13
·7293
·
IF 2.5
Feng Jiang,Shuai He,Jiaxing Qi,Yuanjia Luo,Honghu Tang
The efficient separation of chalcopyrite from molybdenite is crucial for the utilization of copper–molybdenum ores and is inevitably influenced by the presence of metal ions in the pulp. However, the underlying impact mechanisms remain unclear. This study systematically investigated the influence of Cu2+on the flotation separation of chalcopyrite and molybdenite, with sodium thioglycolate (STG) as a depressant. Flotation experiments revealed that Cu2+in the STG system significantly reduced molybdenite recovery and hindered selective separation. Characterization using contact angle, zeta potential, and UV–Vis analysis demonstrated that the presence of Cu2+triggered STG adsorption on the molybdenite surface, thereby increasing its hydrophilicity. XPS analysis showed that Cu2+adsorbed onto the molybdenite surface as Cu(I), creating reactive sites for the –SH or –COO−groups in STG. This interaction forms a stable molybdenite–Cu(I)–STG complex through chemisorption, significantly suppressing molybdenite flotation. DFT calculations further demonstrated that Cu2+enhanced the reactivity between STG and molybdenite. These findings provide a comprehensive understanding of the influences of Cu2+on the flotation separation between chalcopyrite from molybdenite, providing valuable insights into further optimizing copper–molybdenum flotation separation processes.
✓ 已验证
产品关联
DOI
高影响因子
MINERALS ENGINEERING
·
2025
·
IF 5
Siyi Li,Bingqiao Yang,Yudi Yan,Jie Wu,Yang Xu,Bing Deng,Feifei Jia
The flotation of molybdenite particles smaller than 20 μm is inefficient primarily due to the reduction in overall hydrophobicity as particle size decreases. However, previous studies mainly focused on interfacial regulation of molybdenite faces or edges individually, resulting in unsatisfactory recovery and high collector consumption. In this work, an attempt was made to regulate the interfacial properties of both faces and edges synchronously to achieve highly efficient beneficiation of molybdenite fines utilizing a new compound collector consisting of emulsified kerosene and fatty alcohol polyoxyethylene ether phosphate (AEOP). The flotation results demonstrated that the compound collector was more superior than single collector in flotation, which promoted the flotation recovery greatly compared to emulsified kerosene or AEOP. In addition, the synergistic effect of kerosene and AEO-3P was much stronger than that of kerosene and AEO-9P. The results of zeta potential, electrochemical tests and scanning electron microscopy energy dispersive spectrometer (SEM-EDS) indicated that AEOP species preferentially adsorbed on edges, which enhanced the adsorption of emulsified kerosene droplets on edges via intermolecular interactions. Moreover, a portion of AEOP combined with kerosene droplets adsorbed on the molybdenite faces. X-ray photoelectron spectroscopy (XPS) results suggested that the phosphoric acid groups in AEOP bonded with Mo sites on edges. The contact angle results further confirmed that the compound collector synergistically acted on both faces and edges to improve its hydrophobicity. This work provides an innovative perspective to design effective compound collector for the flotation of molybdenite fines in future.
研究领域:
矿物加工
·
表面化学
·
浮选技术
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
MINERALS ENGINEERING
·
2021
·
IF 4.765
Changtao Wang,Runqing Liu,Meirong Wu,Zhijie Xu,Mengjie Tian,Zhigang Yin,Wei Sun,Chenyang Zhang
The selective separation of molybdenite from chalcopyrite is difficult because of their similar floatability in the presence of a collector. In this study, rhodanine-3-acetic acid (3-Rd) was first applied in molybdenite flotation as a novel chalcopyrite depressant, and its depression effect and mechanism were systematically investigated by flotation tests, density functional theory (DFT) calculation, zeta potential measurements, and X-ray photoelectron spectroscopy (XPS) analysis. Single mineral flotation results indicated that 3-Rd can selectively depress chalcopyrite flotation, whereas its effect on molybdenite is negligible. Mixed mineral and bench flotation tests further proved that 3-Rd is an efficient chalcopyrite depressant. The first-principle periodic calculations based on DFT predicted that 3-Rd prefers to adsorb onto Fe rather than Cu because of the more negative adsorption energy of the COO or CSS group on Fe in the chalcopyrite surface. Zeta potential measurements demonstrated that 3-Rd is adsorbed on chalcopyrite surface more selectively, and its adsorption strength is higher than that on molybdenite surface. XPS analysis further confirmed that 3-Rd is chemisorbed on chalcopyrite surface by binding with Fe active site and is adsorbed on molybdenite surface through hydrogen bonding and electrostatic interactions.
研究领域:
矿物加工工程
·
表面化学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED BIOCHEMISTRY AND BIOTECHNOLOGY
·
2020
·Vol. 191
·期 4
·1533-1544
·
IF 2.277
Zhang Yan,Wang Yue,Hasebe Yasushi,Zhang Zhiqiang,Tao Dongping
A non-enzymatic amperometric sensor using natural molybdenite (MLN) electrodeposited with methylene blue (MB) has been fabricated and characterized and its analytical performances were investigated for the determination of ascorbic acid (AA). The surface morphology of the electrode modified by electrodeposited MB was studied by use of the Advanced Mineral Identification and Characterization System (AMICS) and laser confocal high-temperature scanning microscope (LCSM). The poly(MB) and MLN immobilized sensor showed good stability, reproducibility, sensitivity, and selectivity. It exhibited a linear performance range from 3 to 1000 μM, with a lower detection limit of 0.083 μM (signal/noise = 3) and short response time (< 5 s). No obvious decrease in the current was observed after 20 days storage. The methodology reproducibility of this sensor was 2.6%. It showed good anti-interference ability for the potential interfering compounds. The poly(MB) film not only can enhance the electron-transfer rate but also increase the lifetime of the sensor. This study demonstrated the applicability of natural molybdenite for the fabrication of non-enzymatic electrochemical AA sensor.
研究领域:
分析化学
·
材料科学
·
电化学
✓ 已验证
DOI
PubMed
高影响因子
ANALYTICAL SCIENCES
·
2019
·Vol. 35
·期 7
·733-738
·
IF 1.618
Zhao Rui,Wang Yue,Zhang Zhiqiang,Hasebe Yasushi,Tao Dongping
Molybdenite (MLN) was physically co-adsorbed with Ag nanoparticles (Ag) on a glassy carbon electrode (GCE) for selectively sensing of ascorbic acid (AA). The composite was characterized with a scan electron microscope, a hightemperature confocal laser scanning microscope, an X-ray diffractometer, an X-ray fluorescence analyzer and electrochemical methods. The prepared MLN/Ag-GCE sensor exhibited good properties including a linear range from 3.0 × 10 −5 to 1.0 × 10 −3 M toward AA, a low detection limit of 1.5 × 10 −5 M, good selectivity, excellent reproducibility, and good stability. The synergistic effect between MLN and Ag nanoparticles results in an enhancement of the electrocatalytic activity for molybdenite.
研究领域:
分析化学
·
电化学传感器
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
MINERALS ENGINEERING
·
2020
·
IF 3.795
Zhigang Yin,Shengda Chen,Zhijie Xu,Chenyang Zhang,Jianyong He,Jingxiang Zou,Daixiong Chen,Wei Sun
In this work, L-cysteine was introduced as an environmentally-efficient flotation reagent in the selective separation of molybdenite from chalcopyrite. Its flotation performance and adsorption mechanism onto chalcopyrite were also investigated by flotation experiment, zeta potential, FTIR spectra, Raman spectra, TOF-SIMS measurements and DFT calculations. The flotation results indicated that L-cysteine exhibited stronger depressing ability than the conventional chalcopyrite depressants of Na 2 S, NaHS and sodium thioglycolate, suggesting it could become a promising potential depressant in the selective flotation separation of molybdenite from chalcopyrite. The results of zeta potential, FTIR spectra, TOF-SIMS and Raman spectra measurements demonstrated that L-cysteine might chemisorb on the Cu atoms of chalcopyrite surface via -SH and –NH 2 groups to form a stable L-cysteine-Cu chelate compound. The DFT calculations further supported the experimental characterizations; the calculated adsorption reaction energy of L-cysteine with Cu in the (0 0 1) surface of chalcopyrite was much lower than that of L-cysteine with Fe, which implied that L-cysteine would prefer to adsorb onto the Cu site of chalcopyrite surface.
研究领域:
矿物加工
·
环境科学
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Shangyong Lin,Chengwen Wang,Runqing Liu,Wei Sun,Gaogui Jing
Researchers in most of the published works paid a great attention in the effects of pH on the flotation behavior of minerals, where most of which ignored the influences of pH on the surface properties. Herein, the detailed surface analyses of several typical sulfide minerals, namely, molybdenite, bismuthinite, and pyrite, were conducted to identify the effect of pH on the mineral surface property. As observed, all these minerals exhibited excellent hydrophobicity under highly acid conditions. The surface chemical composition of molybdenite and bismuthinite remained relatively steady as pH increased, but the decrease in surface hydrophobicity of bismuthinite was more serious than that of molybdenite under the alkaline conditions. Pyrite was more affected by the pH value. At pH below 4.0, FeS 2 was the dominate species at pyrite surface. With the increase in alkalinity , the pyrite was gradually oxidized and the surface became hydrophilic. As the pH further increased to12.0, the hydrophobicity of pyrite almost vanished due to the deposition of hydrophilic oxidation products (e.g., Fe 2 (SO 4 ) 3 , Fe(OH) 3 , and FeOOH) on its surface. The differences in the surface characteristics of molybdenite, bismuthinite, and pyrite at different pH values can be used to design the flotation process for separation of these sulfide minerals.
研究领域:
矿物学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2026
·
IF 7.1
Taozhong Zhang,Wanzhong Yin,Jin Yao,Wenju Sun,Weifan Du,Chao Yin,Xiaoqi Ban
The inherent floatability of chalcopyrite and molybdenite, together with the environmental concerns associated with conventional depressants, poses a persistent challenge to their efficient and sustainable separation. Therefore, this study evaluates the potential of 4-amino-6-hydroxy-2-mercaptopyrimidine (AHMM) as an efficient depressant and systematically investigates its role in improving flotation selectivity and regulating interfacial interactions. Micro-flotation experiments showed that at neutral pH and an AHMM concentration of 12 mg/L, the recovery of molybdenite reached 92.91%, whereas that of chalcopyrite was only 7.76%. This large difference corresponds to a selectivity index of 12.48, enabling highly efficient separation of the two minerals. Surface analyses—including zeta potential measurements and surface wettability tests—indicated that AHMM preferentially adsorbed onto chalcopyrite, significantly reducing its hydrophobicity. FTIR and XPS results demonstrated that the S and N atoms of AHMM coordinated with Cu atoms on the chalcopyrite surface, leading to the formation of stable surface complexes. DFT calculations further supported the robust chemisorption of AHMM on the chalcopyrite surface, producing a four-membered chelate via Cu–S and Cu–N coordination. Overall, this study demonstrates that AHMM has significant potential to serve as an efficient and selective depressant for chalcopyrite in Cu–Mo flotation separation processes.
✓ 已验证
产品关联
DOI
高影响因子
JOM
·
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
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Wanzhong Yin,Taozhong Zhang,Weifan Du,Xiaoqi Ban,Wenju Sun,Chao Yin,Jin Yao
Efficient and sustainable flotation separation of chalcopyrite and molybdenite is challenging due to the similar inherent floatabilities of the two minerals. Glutathione (GSH) was investigated as a green depressant for improving copper–molybdenum (Cu–Mo) flotation separation, based on the hypothesis that its functional groups selectively bind chalcopyrite surface metal sites. Micro-flotation tests showed that at pH 7 and a GSH dosage of 40 mg/L, Mo recovery in the froth exceeded 98 %, whereas chalcopyrite recovery decreased to 9.36 %. Zeta potential and contact angle analyses confirmed that GSH strongly adsorbed onto the chalcopyrite surface, reducing its surface hydrophobicity, while adsorption on the molybdenite surface was negligible. Fourier transform infrared and X-ray photoelectron spectroscopy analyses revealed that the –SH, –C O, and –NH 2 groups in GSH chemically reacted with Cu or Fe atoms on the chalcopyrite surface, forming strong surface coordination bonds. Density functional theory calculations indicated that the -SH group of GSH formed covalent bonds with both Cu and Fe atoms on the chalcopyrite surface. These results highlight the strong potential of GSH as an environmentally friendly alternative to conventional chalcopyrite depressants.
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Minerals Metallurgy and Materials
·
2025
·Vol. 32
·期 8
·1838-1847
·
IF 7.2
Chen Tao,Liu Runqing,Dong Wenchao,Wei Min,Sun Wei
The environment-friendly and efficient selective separation of chalcopyrite and molybdenite poses a challenge in mineral processing. In this study, gum Arabic (GA) was initially proposed as a novel depressant for the selective separation of molybdenite from chalcopyrite during flotation. Microflotation results indicated that the inhibitory capacity of GA was stronger toward molybdenite than chalcopyrite. At pH 8.0 with 20 mg/L GA addition, the recovery rate of chalcopyrite in the concentrate obtained from mixed mineral flotation was 67.49% higher than that of molybdenite. Furthermore, the mechanism of GA was systematically investigated by various surface characterization techniques. Contact angle tests indicated that after GA treatment, the hydrophobicity of the molybdenite surface significantly decreased, but that of the chalcopyrite surface showed no apparent change. Fourier transform-infrared spectroscopy and X-ray photoelectron spectroscopy revealed a weak interaction force between GA and chalcopyrite. By contrast, GA was primarily adsorbed onto the molybdenite surface through chemical chelation, with possible contributions from hydrogen bonding and hydrophobic interactions. Pre-adsorbed GA could prevent butyl xanthate from being adsorbed onto molybdenite. Scanning electron microscopy–energy-dispersive spectrometry further indicated that GA was primarily adsorbed onto the “face” of molybdenite rather than the “edge.” Therefore, GA could be a promising molybdenite depressant for the flotation separation of Cu–Mo.
研究领域:
矿物加工
·
环境科学
·
表面化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Heng Yu,Wei Sun,Chenyang Zhang,Zechao Huangfu,Fuchao Fan
In the field of mineral processing, the flotation separation of talc and molybdenite has long faced severe challenges, and the development of efficient flotation depressants is a crucial research direction to address this issue. Due to the complex pulp environment, the selective depression effect of a single flotation depressant is relatively poor and significantly influenced by pH levels. In contrast, combined depressants offer advantages such as synergistic depression mechanisms, multi-target action, and less sensitivity to pulp environment, making them the core technical for the flotation separation of talc and molybdenite. This study innovatively employs sodium carboxymethyl starch (CMS) and Aluminum chloride (AlCl₃) as combined depressants for the separation of talc and molybdenite and systematically compares the differences in adsorption behavior and mechanisms on different crystal surfaces of talc and molybdenite using various characterisation methods in conjunction with micro-flotation experiments. The results indicate that the unique structures and wettability differences of the various crystal surfaces of talc and molybdenite are the direct reasons affecting the depression effectiveness of the combined depressants. Further research shows that CMS and AlCl₃ first form a complex, which then adsorbs onto the surface of talc, with the combined adsorbent exhibiting stronger adsorption on the talc (100) surface than on the (001) surface. Flotation results indicate that when the concentration of CMS is 0.25 × 10⁻³ mol/L, the recovery rate of molybdenite reaches its highest at 92.51 %; conversely, when the concentration of CMS is 1.25 × 10⁻³ mol/L, the recovery rate of talc drops to its lowest at 13.01 %. This research offers a new technological avenue for the efficient selective separation of talc-containing molybdenite systems, showcasing significant industrial application value.
研究领域:
矿物加工
·
浮选技术
·
表面化学
·
吸附机理
·
络合化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）