APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Heng Yu,Wei Sun,Chenyang Zhang,Zechao Huangfu,Fuchao Fan
Due to the limitations of existing flotation technologies, the resource development of talc-containing molybdenum ores remains an urgent issue that must be addressed. The development of effective talc depressants has become a significant research focus. Studies indicate that the combination of sodium carboxymethyl starch (CMS) and magnesium ion (Mg 2+ ) can effectively inhibit talc, achieving high selective flotation of molybdenite. However, the interaction mechanism between CMS and Mg 2+ , as well as its depressing mechanism on the anisotropic surface of talc, remains unclear. To address this issue, this study employed multiple testing methods and combined micro-flotation tests to systematically compare the differences in adsorption and bonding mechanisms between the mixed dosing system and the sequential dosing system on various crystal surfaces of talc and molybdenite, while also exploring their impact on flotation behavior. The research results indicate that in the mixed dosing system, CMS and Mg 2+ interact with the surface of talc through complex formation, which enhances its hydrophilicity. When the concentration of CMS is 1 × 10 -3 mol/L, the average recovery rate of talc decreases to 14.82 %, while the recovery rate of molybdenite reaches 84.85 %, thereby facilitating the selective separation of talc and molybdenite.
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
JOURNAL OF MOLECULAR LIQUIDS
·
2024
·
IF 5.3
Mengyao Qi,Zhenkai Luo,Weijun Peng,Wei Wang,Yijun Cao,Longyu Zhang,Yukun Huang
The separation of talc and molybdenite is a challenging and research hotspot in mineral processing. In the work, a nitrous acid ester depressant (M−DEP) was first synthesized and used as a molybdenite depressant for the separation of talc and molybdenite via reverse flotation. Flotation tests of single-mineral and multi-mineral samples were carried out to evaluate the effect of M−DEP on the flotation behavior of molybdenite and talc. Zeta potential, X-ray photoelectron spectroscopy, and Fourier Transform Infrared Spectroscopy were used to analyze the selective depression mechanism of M−DEP on molybdenite and talc. Furthermore, the adsorption behavior of M−DEP on specific crystallographic planes of minerals has been studied by contact angle, atomic force microscope, and DFT calculation. Flotation experiment results indicated that M−DEP had excellent selective depression on molybdenite in the pH range of 5 to 10. The results of mechanism analysis showed that M−DEP could be adsorbed on molybdenite “basal” surface by hydrophobic interaction, and on molybdenite “edge” surface by chemical interaction, while could not be adsorbed on the surface of talc due to electrostatic repulsion. M−DEP enlarged the surface floatability difference between talc and molybdenite and promoted the efficient separation of talc and molybdenite via reverse flotation.
研究领域:
矿物加工工程
·
材料化学
✓ 已验证
产品关联
DOI
高影响因子
MINERALS ENGINEERING
·
2024
·
IF 4.9
Jie Wu,Bingqiao Yang,Rudolph Martin,Shaoxian Song,Mildred Quintana,Feifei Jia,Huihua Luo,Fang Zhou,Xiang Tian
Utilizing xanthate in bulk flotation of Cu-Mo sulfide ores is inevitable, but the implication of xanthate on the flotation of molybdenite fines is barely understood. In this study, the influence of sodium butyl xanthate (SIBX) on the flotation of molybdenite fines and the interaction mechanism was comprehensively investigated by micro-flotation tests, contact angle, adsorption capacity, electrochemical tests, atomic force microscopy (AFM), Fourier Transform Infrared Spectrometer (FTIR), X-ray Photoelectron Spectroscopy (XPS) and density functional theory (DFT) calculations. Micro-flotation tests indicated that SIBX significantly enhanced the flotation of molybdenite fines across a wide pH range. Contact angle, adsorption capacity, Tafel curves, AFM, FTIR and XPS results suggested both xanthate and dixanthogen species adsorbed on molybdenite surfaces, thus improving the hydrophobicity of both edges and faces. Rest potential measurements clarified dixanthogen species dominated on faces while xanthate ions prevailed on edges. DFT calculations elucidated dixanthogen physically adsorbed (−66.06 kJ/mol) on faces while xanthate chemisorbed (−235.62 kJ/mol) on edges via the hybridization of two S atoms within SIBX with two Mo atoms to form highly covalent bonds. This work first clearly unveiled the anisotropic adsorption mechanism of SIBX species on faces and edges, significantly improving the flotation efficiency of molybdenite fines.
研究领域:
矿物加工工程
·
表面化学
✓ 已验证
DOI
高影响因子
MINERALS ENGINEERING
·
2021
·
IF 4.765
Wanjia Zhang,Liming Tao,Luobing Xun,Zhongxu Qi,Stephen Pooley,Wei Sun,Jian Cao,Zhiyong Gao
Talc is one of the most problematic gangue minerals for molybdenite flotation owing to its strong natural hydrophobicity. In this work, pullulan polysaccharide (PU) was evaluated as a potential depressant in the flotation separation of molybdenite from talc. Bench flotation tests of single mineral samples and multi-mineral samples were carried out to evaluate the performance of PU in flotation. And the results show that under the preferable reagent scheme of 40 mg/L PU, 160 mg/L butyl xanthate (BX) and 25 μL/L MIBC, molybdenite can be effectively separated from talc over a wide pH range (from 2.0 to 8.0). Furthermore, FTIR and XPS analyses demonstrate that BX can desorb the pre-adsorbed PU on the surface of the molybdenite by competitive adsorption, but has only a slight effect on the PU adsorbed on surface of the talc. The results also confirm that PU has a strong and stable adsorption on the surfaces of talc and molybdenite, whereas BX adsorbs more strongly on the surface of molybdenite. Hence, the reagent scheme of PU + BX, with biodegradability, low toxicity, low cost and synergistic selectivity, has great potential for industrial application in the flotation separation of molybdenite from talc.
研究领域:
矿物加工工程
·
化学工程
✓ 已验证
DOI
高影响因子
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
·
2022
·
IF 3.752
Hu SUN,Guang-hui LI,Qun-zhen BU,Zhong-qiao FU,Hui-bo LIU,Xin ZHANG,Jun LUO,Ming-jun RAO,Tao JIANG
Roasting experiments were carried out with pure reagents as raw materials. The self-sintering behaviors of molybdenite (MoS 2 ) during oxidation were investigated by thermodynamic calculation, XRD, SEM-EDS and high-temperature in situ analysis. The results indicate that the desulfurization efficiency of MoS 2 pellet decreases with the increase of roasting temperature from 600 to 700°C, owing to the expansion of sintered area. At the very beginning of roasting, sintered layer can be rapidly formed and cover the pellet surface on the windward side, and meanwhile, MoO 2 and Mo 4 O 11 intensively appear and constitute the sintered layer together with MoO 3 . Moreover, it is proven that MoO 3 -rich products containing low-valence molybdenum oxides have low melting points, thus easy to be melted during the occurrence of exothermic reaction between MoS 2 and O 2 , which leads to the sintering of materials.
研究领域:
冶金学
·
材料科学
·
提取冶金
·
高温化学
✓ 已验证
DOI
高影响因子
MINERALS ENGINEERING
·
2020
·
IF 3.795
Bingqiao Yang,Hai Yan,Mengyuan Zeng,Pengliang Huang,Feifei Jia,Aiping Teng
In this work, the effect of Na 2 S 2 O 3 and the mixture of Na 2 S 2 O 3 and Cu 2+ on the selective flotation performances of chalcopyrite and molybdenite were investigated through single and mixed mineral flotation tests. The depression mechanisms were studied in detail through Zeta potential, contact angle, XPS and Raman measurement. The results indicated that Na 2 S 2 O 3 had more powerful depression effect on chalcopyrite than that on molybdenite. The depression could be greatly enhanced with the addition of Cu 2+ without losing selectivity. XPS and Raman measurement revealed that Na 2 S 2 O 3 and Cu 2+ chemically adsorbed on chalcopyrite surface, formation of CuS which was responsible for the depression. On the other hand, the surface of molybdenite was slightly affected after the treatment in the mixed solution of Na 2 S 2 O 3 and Cu 2+ . This new depressant had the advantage of low cost and environment friendly over conventional depressant, which could be utilized as an alternative depressant for the selective flotation separation of chalcopyrite and molybdenite.
研究领域:
矿物加工工程
·
表面化学
✓ 已验证
DOI
高影响因子
Journal of the Taiwan Institute of Chemical Engineers
·
2025
·
IF 6.3
Yunxiang Du,Zhuoyue Lan,Wanting Yang,Xiong Li,Yunchuan Li,Hang Li,Zhiyu Pu,Letian Hu
Background Conventional chalcopyrite depressants face environmental and selectivity challenges in copper-molybdenum separation. This study introduces 1-thioglycerol (1-TG), an eco-friendly organic depressant, demonstrating exceptional selectivity for chalcopyrite. Methods The depression performance of 1-TG was evaluated through flotation experiments. Its selective adsorption mechanism was elucidated using surface characterization techniques, including contact angle, SEM-EDS, LEIS, FTIR, XPS and molecular dynamics simulations. Significant findings 1-TG achieved efficient separation of molybdenite from chalcopyrite. For the synthetic mixed ore at pH 5 with 25 mg/L 1-TG, recoveries of Cu and Mo were 6.01% and 89.53%. Mechanistic studies demonstrated that 1-TG selectively chemisorbs on chalcopyrite surfaces through coordinating with metal sites, effectively masking adsorption sites and reducing surface hydrophobicity. The -SH groups in 1-TG promoted selective adsorption, as confirmed by surface analyses. This non-toxic depressant functions effectively at low dosages, offering a sustainable alternative to conventional toxic inhibitors like cyanides. The findings provide fundamental insights into green reagent design and advance eco-friendly strategies for sulfide mineral separation, addressing critical environmental and efficiency challenges in copper-molybdenum processing.
研究领域:
矿物加工工程
·
资源与环境科学
·
表面化学
·
冶金工程
·
可持续技术
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL TECHNOLOGY
·
2026
·
IF 2.2
Zhenghang Lai,Yanping Ding,Yu Yang,Lei Cheng,Jingwen Wang,Yong Liu
The Fenton-like application potential of MoS2 has recently attracted widespread interest in advanced oxidation processes. This study utilized natural molybdenite ore as the source of MoS2, and the Fenton-like reactivity of molybdenite was further enhanced by dropping Fe(III) ions on the basal planes of MoS2. EDS elemental analysis and XPS results suggest that Fe species were successfully anchored on the molybdenite surface, which exhibited exceptional efficiency in peracetic acid (PAA) activation. The Fe-molybdenite/PAA system achieved 83.2% degradation of sulfamethazine (SMT) within 30 min, and the reaction efficiency by Fe-molybdenite was 3.3 times higher than that of the unmodified molybdenite. HO• and Fe(V) were identified as the reactive species (RSs) during PAA activation, and SMT was degraded by these RSs. Increasing Fe-molybdenite and PAA dosages enhanced SMT degradation, with optimal performance observed at pH 4. Hydroxylation, nitrification, Smiles rearrangement and radical recombination reactions were involved during SMT degradation. Tetracyclines, dyes and other sulphonamide antibiotics could also be well degraded by Fe-molybdenite/PAA. This study elucidates fundamental design principles for engineering Fenton-like catalysts from natural mineral precursors.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE
·
2024
·Vol. 55
·期 6
·5221-5234
·
IF 2.4
Sun Hu,You Mengyu,Hou Yanrui,Luo Jun,Rao Mingjun,Han Guihong,Li Guanghui
The mainstream oxidative roasting method is facing challenges in processing low-grade molybdenite (MoS 2 ) concentrates, calling for deep understandings toward the behaviors of impurities. This study took pure minerals and reagents as the objects and conducted elaborate experiments and theoretical calculations into the formations of molybdates and their influences on MoS 2 oxidation. The emphasis are on the reactions under local O 2 -absent conditions and the sintering of MoS 2 caused by molybdates of Ca, Fe, Cu, or Pb. It was found that molybdates could directly form from MoO 2 or MoS 2 without O 2 at 600 °C to 650 °C, due to the promotion of reactivity and reducibility of MoO 2 when combining with impurity metals. The produced molybdates would lower the melting point, dissolve in liquid MoO 3 , and migrate to oxidation interface to form a sintering layer that inhibits O 2 diffusion. Overall, this study has discovered new pathways of molybdates formation and new effects of segregation on the sintering and established evolution patterns of bulk MoS 2 concentrate during roasting, which may be significant complements to the fundamentals of classical molybdenum metallurgy.
研究领域:
冶金学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Minerals
·
2021
·Vol. 11
·期 4
·410
·
IF 2.644
Yangjia Hu,Zhiqiang Zhao,Liang Lu,Huanyu Zhu,Wei Xiong,Yangge Zhu,Sigang Luo,Xingrong Zhang,Bingqiao Yang
In this study, a novel organic depressant maleyl 5-amino-1,3,4-thiadiazole-2-thiol (MATT) was synthesized and utilized as a galena depressant in the flotation separation of molybdenite and galena. The results of the flotation test indicated that MATT exhibited an excellent depression ability on galena but barely influenced the flotation of molybdenite in the pH range of 6.0–11.0. Zeta potential results suggested that MATT preferentially adsorbed on galena surface. UV-visible spectroscopy analysis indicated that the stoichiometric ratio of lead ion and reagent in the complex compound. XPS analysis demonstrated that the S (-SH) atom and N (1,3,4-thiadiazole group) atom of MATT coordinated with the Pb atom on galena surface.Keywords:flotation;galena;molybdenite;depressant;MATT
研究领域:
矿物加工工程
·
化学工程
✓ 已验证
DOI
高影响因子
Minerals
·
2022
·Vol. 12
·期 10
·1234
·
IF 2.818
Zhiqiang Zhao,Yangjia Hu,Jianhua Chen,Yangge Zhu,Liang Lu,Wei Xiong,Sigang Luo
In order to achieve the effective separation of copper-molybdenum in the presence of xanthate and kerosene, carrageenan was explored as a novel environmentally friendly molybdenite depressant in this work. The flotation behavior of molybdenite was studied by micro-flotation tests, and the depression mechanism was investigated through zeta potential, Fourier Transform Infrared Spectroscopy (FTIR) and atomic force microscope (AFM) analysis. The flotation results showed that molybdenite was significantly depressed by carrageenan in the pH range of 6–12 even in the presence of xanthate and kerosene. Zeta potential, FTIR and AFM measurement demonstrated that carrageenan could adsorb strongly on the molybdenite surface and change the surface wettability of molybdenite, thus significantly reducing the floatability of molybdenite.Keywords:flotation;molybdenite;separation;carrageenan;depressant
研究领域:
矿物加工
·
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Advanced Materials Interfaces
·
2022
·Vol. 9
·期 21
·2200658
·
IF 6.389
Chunye Yang,Siyuan Lin,Wenqing Zhao,Yu Dong,Yueheng Qi,Shaohui Yuan,Zihao Zeng,Li Wang,Yue Yang,Peng Ge
Natural molybdenite (MoS 2 ) displays large interlayer distance and rich electrochemical activities, but suffers from the complex preparation process with serious pollution. MoS 2 , as the low-cost resources, have captured numerous attentions as first-hand energy-storage materials. However, they are still limited by the shuttling of polysulfide and side reactions. Through the in situ solution deposition and thermochemical methods, molybdenite@La 2 O 3 is successfully prepared with the formation of Mo S La bonds in the interfaces. La 2 O 3 , as the important catalyst, is uniformly distributed on the surface of molybdenite, which serves vital roles in the redox reversibility. Owing to the fascinating architecture, the as-obtained samples deliver a considerable capacity of 803.1 mA h g −1 , with high coulombic efficiency of 86.32%. After 500 cycles, the capacity increases up to ≈ 1200 mA h g −1 . Even at 5.0 A g −1 , its capacity can be remained ≈ 550 mA h g −1 after 100 cycles. Assisted by the detailed kinetic behaviors, the improved energy-storage capability mainly comes from the enhancements of pseudocapacitive behaviors. Moreover, benefiting from the detailed resistance analysis, the existing of La 2 O 3 can induce the evolution of redox reactions stability. Thus, the work is expected to provide effective modified strategy for natural molybdenite in energy-storage systems.
研究领域:
材料科学
·
能源科学
✓ 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）