MINERALS ENGINEERING
·
2018
·
IF 2.707
Dandan Gong,Kanggen Zhou,Changhong Peng,Junjie Li,Wei Chen
Extraction of tungsten from scheelite is important for the processing of tungsten resources for tungsten metallurgical companies. However, there are many difficulties to leach scheelite compared to wolframite. Compared with calcium tungstate (CaWO 4 ), magnesium tungstate (MgWO 4 ) is a readily soluble substance in NaOH solution. In this paper, conversion of CaWO 4 to MgWO 4 through roasting a mixture of scheelite and MgCl 2 was investigated systematically. The leaching performance of the roasted products in NaOH solution was also studied. Thermodynamic analyses and experimental results showed that MgWO 4 could be prepared through reaction of CaWO 4 with MgCl 2 . Increasing roasting temperature and MgCl 2 dosage could increase the extent of conversion of CaWO 4 to MgWO 4 . Additionally, leaching experiments showed a good leachability of the roasted products with a tungsten leaching efficiency of 98.79% in 4 M NaOH solution at 90 °C. This work may provide an alternative approach for the extraction of tungsten from scheelite.
研究领域:
冶金工程
·
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
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
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
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
·
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL POLLUTION
·
2022
·
IF 9.988
Lu Jiang,Pingxiao Wu,Yijing Xu,Yihao Li,Meiqing Chen,Zubair Ahmed,Nengwu Zhu
Triclinic birnessite (TB), a typical layered Mn oxide which is abundant naturally occurring minerals with a vital impact on the transformation of arsenite (As(III)) by adsorption and oxidation . As one of the most common critical metalloids , ammonium ion (NH 4 + ) universally coexists with birnessite in marine, sediments or groundwater where are contaminated with As(III). In this study, we investigated the impacts of NH 4 + on TB towards the transformation of As(III). Compared with the original TB (40.1%), the As(III) removal efficiencies of three different concentration (0.5 M, 1 M and 2 M) NH 4 + impressed triclinic birnessite (TB-0.5 N, TB-1N and TB-2N) are increased rapidly in the order of: TB-2N (80.4%) > TB-1N (75.8%) > TB-0.5 N (71.5%). In addition, TB-2N exhibited the highest initial oxidation rate of 0.0031 min −1 which exceeds twice as much as this of TB (0.0014 min −1 ). And TB-2N could reach the max oxidation efficiency when the As concentration is 0.08 mM. Due to two different mechanisms of As(III) oxidation on birnessites under acidic and alkaline conditions, TB-2N showed a higher removal efficiency than TB at pH 3.0, 5.0, 7.0 and 9.0. Hence, there are two main reasons for the advanced As(III) oxidation capacity of TB-2N. One is the improvement of the average oxidation state of Mn, the other is the increase of oxygen vacancy with the coexistence of NH 4 + . Moreover, the larger specific surface area of TB-2N also contribute to enhancing As(III) oxidation capacity. This study holds a fundamental understanding of the behavior of triclinic birnessite which is coexisted with ammonium ion towards the transformation of As(III) in the environment.
研究领域:
环境科学
·
矿物学
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Zechao Huangfu,Wei Sun,Runqing Liu,Chen Chen,Chenyang Zhang,Heng Yu,Siyuan Liu
The effective recovery of talc-bearing molybdenum ores has been a research hotspot in the field of minerals processing, which is mainly attributed to the similarity of the physical and chemical properties of talc and molybdenite, especially floatability, which presents a challenge in the separation of the two during the beneficiation process. Herein, the coordination affinity, differentiated adsorption configurations, adsorption morphology, and bonding mechanisms of a polysaccharide-based depressant, carboxymethyl starch (CMS), on the layered hydrophobic minerals molybdenite and talc have been compared and its special use in flotation was investigated by various advanced techniques, including density functional theory (DFT) simulation, time-of-flight secondary ion mass spectrometry (TOF-SIMS) and X-ray photoelectron spectroscopy (XPS). The CMS adsorption on the talc surface was more affinitive than that of molybdenite and it is possible to achieve the selective separation of laminar hydrophobic minerals molybdenite and talc through the utilization of differential wettability. Flotation kinetics with 400 mg/L CMS as a depressant and 3*10 −3 mol/L sodium diethyldithiocarbamate (DDTC) as a collector has highlighted the importance of the mineral particle sizes that the better depressant activity of CMS on the coarse-grained talc surface in comparison to that of molybdenite is attributed to the greater adsorption energy and more homogeneous adsorption morphology of CMS on the talc basal surface which is the dominant surface affecting the floatability.
研究领域:
矿物加工工程
·
材料科学与工程
✓ 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
HYDROMETALLURGY
·
2017
·
IF 2.605
Xiaobin Li,Leiting Shen,Qiusheng Zhou,Zhihong Peng,Guihua Liu,Tiangui Qi
Aiming to treat scheelite concentrate for producing ammonium paratungstate efficiently and cleanly, the conversion of scheelite to H 2 WO 4 and CaSO 4 ·nH 2 O in H 2 SO 4 solution was firstly studied in this work. The results show that H 2 SO 4 concentration, temperature, time, stirring speed, and particle size affect the conversion efficiency. Moreover, this work reveals that solid H 2 WO 4 layer on the surface of CaWO 4 particles forms and develops from thickness and looseness to thinness and denseness with increasing H 2 SO 4 concentration, and thus hinders the conversion of CaWO 4 to H 2 WO 4 , whereas CaSO 4 ·nH 2 O almost does not deposit in the layer. Meanwhile, H 2 WO 4 layer on CaWO 4 surface is resulted by isopolytungstate ions diffusion-tungstic acid deposition in diffusion layer. Additionally, the performance of separating H 2 WO 4 from CaSO 4 ·nH 2 O by leaching the converted product with aqueous ammonium carbonate solution was examined, showing that the converted product has an excellent leachability of tungsten in aqueous ammonium carbonate solution at ambient temperature with WO 3 leaching efficiency of about 99%. This work has the potential to develop a novel technique for tungsten extraction from scheelite concentrate under atmospheric pressure, bypassing the conversion of Na 2 WO 4 to (NH 4 ) 2 WO 4 .
研究领域:
冶金学
·
化学工程
✓ 已验证
DOI
高影响因子
MINERALS ENGINEERING
·
2018
·
IF 2.707
Yubiao Li,Zhiming Li,Bing Wang,Zhaomin Dong,Shaoxian Song
The mechanical activation was applied as a pre-treatment method to improve molybdenite (MoS 2 ) leaching . The effects of grinding ball size, ball to powder mass ratio, milling speed and time, molar ratio of mineral to oxidants, as well as the influence of solution pH, temperature and leaching time were investigated in detail. The results showed an extremely low Mo extraction (less than 2% at acidic and neutral conditions) for MoS 2 activated alone. However, Mo extraction was increased significantly after co-grinding of MoS 2 with NaClO 2 and Na 2 CO 3 , e.g ., more than 58% in any leaching solution applied. Prolonging the grinding time improved Mo extraction but the efficiency was declined gradually, giving rise to an optimum grinding efficiency at 4 h with a molar ratio of 1:3:5 for MoS 2 :NaClO 2 :Na 2 CO 3 . Distilled water was selected as the leaching solution since this gave similar Mo recovery to other lixiviants. Higher temperature and longer leaching time were beneficial to Mo extraction. However, it was also found that too large grinding balls and high ball to powder mass ratio adversely affected MoS 2 extraction. The kinetics analysis indicated that the leaching of activated MoS 2 followed a chemical reaction controlled mechanism. The XRD and SEM analyses indicated that mechanical activation not only reduced the particle size of MoS 2 but also triggered solid state reaction to produce soluble Na 2 MoO 4 , thereby improving Mo extraction significantly.
研究领域:
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
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
·
表面化学
✓ 已验证
DOI
高影响因子
MINERALS ENGINEERING
·
2021
·
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
·
表面化学
✓ 已验证
DOI
高影响因子
MINERALS ENGINEERING
·
2021
·
IF 4.765
Zheyu Huang,Jingzhong Kuang,Luping Zhu,Weiquan Yuan,Zhilei Zou
The effect of ultrasound on the solution properties and microstructure of benzohydroxamic acid (BHA) were investigated to separate scheelite from calcite effectively in this study. The influence of ultrasound-treated BHA on flotation kinetics, surface properties and the adsorption heat of reagents and minerals was discussed. The results show that the difference in the flotation rate between scheelite and calcite was significantly increased by ultrasound-treated BHA. The grade and recovery rate of tungsten concentrate were increased and the flotation time was reduced, which resulted in the rapid separation of scheelite and calcite. Ultrasonic effects significantly increased the adsorption amount, adsorption rate and contact on the surface of scheelite with BHA, which have no noticeable effects on the surface of calcite. The adsorption heat of the interaction between BHA and scheelite was significantly increased by ultrasound due to the increase in the adsorption rate of scheelite on BHA. The ultrasonic effect promotes the dissociation of BHA in solution and the formation of a fine droplet structure, reduces the surface tension, resulting the decrease in the adhesion work and induction time between BHA and scheelite.
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
危险品化学品经营许可证（带存储）