JOURNAL OF HAZARDOUS MATERIALS
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2024
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IF 12.2
Wen-Jun Wu,Qing-Jun Zheng,Jing-Wen Liang,Hai-Ming Zhao,Bai-Lin Liu,Yan-Wen Li,Nai-Xian Feng,Quan-Ying Cai,Lei Xiang,Ce-Hui Mo,Qing X. Li
Xanthates , common mining flotation reagents, strongly bind thiophilic metals such as copper (Cu), lead (Pb), cadmium (Cd), and zinc (Zn) and consequentially change their bioavailability and mobility upon their discharge into the environment. However, accurate quantification of the metal-xanthate complexes has remained elusive. This study develops a novel and robust method that realizes the accurate quantification of the metal-xanthate complexes resulted from single and multiple reactions of three typical xanthates (ethyl, isopropyl, and butyl xanthates) and four thiophilic metals (Cu, Pb, Cd, and Zn) in water samples. This method uses sulfur (S 2- ) dissociation, followed by tandem solid phase extraction of C 18 + PWAX and subsequent LC-MS/MS analysis. It has a wide linearity range (1–1000 μg/L, R 2 ≥ 0.995), low method detection limits (0.002–0.036 μg/L), and good recoveries (70.6–107.0 %) at 0.01–10 mg/L of xanthates. Applications of this method showed ubiquitous occurrence of the metal-xanthate complexes as the primary species in flotation wastewaters, which the concentrations were 4.6–28.9-fold higher than those previously determined. It is the first quantitative method established for the analysis of metal-xanthate complexes in water samples, which is of great importance to comprehensively understand the fate and risks of xanthates in the environment.
研究领域:
环境化学
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分析化学
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采矿工程
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产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
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2023
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IF 6.7
Qiming Zhuo,Panpan Wang,Peilun Shen,Penghui Wang,Yongqi Tian,Decheng Chen,Jiushuai Deng,Wenli Liu
With the gradual depletion of copper sulfide resources, efficient flotation technologies for the recovery of copper oxide minerals, such as malachite, have received significant attention. Although sulfidization plays a critical role in malachite flotation, the fundamental theory of sulfidization flotation remains uncertain in the context of practical industrial applications. In this study, evolution of the sulfide product morphology on the malachite surface was observed after treatment with various concentrations of sodium sulfide. In addition, the valence states and phase compositions of the sulfide products were investigated using different X-ray techniques. Furthermore, the evolution of the malachite surface morphology after the formation of a sulfide film was investigated, as were the interaction forces between the malachite and bubbles under the action of butyl xanthate. As a result, it was possible to directly observe the growth process of the sulfide film on the malachite surface, and the presence of Cu(I) was confirmed in the sulfide products. Moreover, the compositions of the sulfide products were investigated using X-ray techniques. The obtained results demonstrated that the sulfide film facilitated the formation of butyl xanthate product layers on the malachite surface, whilst also enhancing the interfacial interaction forces between the malachite and the bubbles.
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
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
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IF 5.518
Rongdong Deng,Yi Wang,Wenting Duan,Dingquan Xing,Yuan Hu
Smithsonite is a common oxidized zinc ore , and its recovery has gained increasing attention to meet the high demand for zinc. Current methods to concentrate oxidized zinc ores are through sulfidation flotation or “sulfidation + metal + xanthate” flotation. However, such techniques are not sufficiently efficient for treating smithsonite. In this study, Pb(NO 3 ) 2 was used to pre-treat smithsonite as a crystallization inducer, and the mechanism of lead modification was studied through micro-flotation tests, adsorption measurements, contact angle measurements, X-ray diffraction (XRD), scanning electronic microscopy (SEM), and TOF-SIMS analysis. The micro-flotation test results showed that the recovery of smithsonite after Pb 2+ pre-treatment increased from 80.3% to 85.3%. The comprehensive results of adsorption experiments, contact angle measurements, XRD and SEM analysis indicated that Pb 2+ adsorbed on the smithsonite surface and transformed portion of smithsonite into cerussite, increasing the active sites on the mineral surface for adsorption of S ions . The newly formed PbS after sulfidation had an effect of induced crystallization on subsequently formed PbS, increasing PbS species and making the surface more effective for xanthate flotation. ToF-SIMS was used to visualize the 3D distribution of Pb 2+ and S 2- adsorption, and it further proved that pre-treatment with Pb(NO 3 ) 2 enhanced the sulfidation process of smithsonite.
研究领域:
矿物加工工程
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冶金工程
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DOI
高影响因子
MINERALS ENGINEERING
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2018
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IF 2.707
Yanfei Chen,Guofan Zhang,Mengtao Wang,Qing Shi,Dezhi Liu,Qi Li
Sulphidisation xanthate flotation is a common process in dealing with zinc oxide minerals and sulphidisation is the key procedure in the zinc mineral recovery. In this study, the effect of Ca 2+ on the sulphidisation flotation of smithsonite was investigated by flotation tests. The results show that the presence of Ca 2+ impairs the sulphidisation flotation of smithsonite. Adsorption studies and scanning electron microscopy coupled with energy dispersive spectroscopy (SEM-EDS) analysis illustrate that at pH 9.5, where the sulphidisation process is routinely performed, the positively charged Ca(OH) 2(s) , Ca(OH) 2(s) , and CaOH + produced due to hydrolysis and precipitation of Ca 2+ will preferentially adsorb onto smithsonite surface, preventing the adsorption of sulfur ions. Thus, the insufficient sulphidisation on smithsonite surface cannot promote the mineral flotation performance. Interestingly, sodium carbonate can eliminate adverse effect of Ca 2+ by charge reversal. For its reactivity with Ca 2+ , the formation of negatively charged calcium carbonate ceases the adsorption of calcium onto smithsonite surface as a consequence of electrostatic repulsion. As thus, the sulphidisation flotation of smithsonite is regained.
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
JOURNAL OF MOLECULAR LIQUIDS
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2023
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IF 6
Zhihao Shen,Shuming Wen,Yongchao Miao,Han Wang,Qicheng Feng
Unavoidable metal ions commonly exist in the pulp during flotation. These ions can affect the floatability of minerals, and they can also result in the differences in the surface features between different minerals. In this study, how Fe 3+ affected the flotation behavior of cerussite was investigated by micro-flotation tests. The corresponding adsorption characteristics of the sulfidizing agent and collector on the surfaces of cerussite were investigated by surface-analysis techniques. The results of micro-flotation tests showed that the floatability of cerussite significantly decreased when Fe 3+ was added before Na 2 S and xanthate. The flotation recovery of cerussite decreased compared with that obtained without participation of Fe 3+ . Additionally, the results of xanthate and Na 2 S adsorption tests, X-ray photoelectron spectroscopy (XPS), time-of-flight secondary ion mass spectrometry (ToF-SIMS) and zeta potential measurements verified that Fe 3+ and its hydrophilic hydroxyl derivatives (Fe-OH compounds) resulted in reduced amounts and reactive activities of S-bearing species adsorbed on the surfaces of cerussite. This decreased the adsorption capacity of subsequently added xanthate, resulting in the difficulty in effectively recovering cerussite in the sulfidization-xanthate system.
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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2023
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IF 6
Baoxun Zhao,Lijun Deng,Yaming Wang,Guosheng Li,Yijun Cao
Butyl xanthate (BX) usually serve as an available collector in the sulfide mineral flotation. However, it will cause severe pollution and be harmful for living beings when discharged together with beneficiation wastewater. Adsorption, affected by sorbents structure to a great extent, is an effective strategy to treat BX-bearing wastewater. In this paper, ionic liquid-loaded fumed silica (IFS) generated by a simple process was acted as an adsorbent for removing BX from aqueous solution. The ratio of IL loaded onto silicon was about 40 %. The N elements existing in the structure of adsorbents suggested IL loaded onto silica surface successfully. The specific surface area of IFS was 65.25 m 2 /g, which was smaller than original material. And the total pore volume decreased from 36.75 to 15.22 cm 3 g −1 after modification. Different from the virginal silica barely adsorbing BX, ionic liquid (IL) loaded silica had large uptake capacity up to 202.84 mg/g under the combined effect of functional groups modified in the silica particle and the porous structure of nanomaterial. The adsorption kinetics and isotherms are followed with the pseudo-second-order model and Langmuir model, respectively. And the functional groups, charge of adsorbent were analyzed to reveal approaching mechanism. This paper provides an alternative for xanthate and other organic contaminants treatment.
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
MINERALS ENGINEERING
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2022
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IF 5.479
Qinzhi Yuan,Guangjun Mei,Cheng Liu,Qian Cheng,Siyuan Yang
The benzohydroxamic acid (BHA) and sodium butyl xanthate (SBX) mixture was used as a collector for the flotation of moderately oxidized pyrrhotite (MOP) in this work. Microflotation results revealed that the flotation recovery of MOP was not very high with the addition of individual SBX or BHA collector, but significantly improved using a mixed collector of SBA/BHA, the maximum flotation recovery of could reach 88.55%. Zeta potential measurement revealed that the surface charges of MOP were negatively moved after the addition of mixed SBX/BHA compared to adding SBX or BHA alone, revealing a much stronger interaction between the collector mixture and MOP surface, leading to the improvement of MOP floatability. The FTIR spectra analysis revealed that the synergistic effect of SBX/BHA was attributed to the interaction between BHA and MOP, which could reduce the hydrophilic Fe(OH) 3 on the pyrrhotite surface, allowing more adsorption of SBX onto the generated fresh unoxidized surfaces.
研究领域:
矿物加工工程
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表面化学
✓ 已验证
产品关联
DOI
高影响因子
MINERALS ENGINEERING
·
2024
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IF 4.9
Xiaoqi Wu,Zhaoyang Song,Qiongqiong He,Yifei Li,Pengxu Xiang,Yuan Xu,Ping Ma
Owing to the technological limitations associated with beneficiation technology, large amounts of flotation reagents remain in mineral processing wastewater, which is extremely detrimental to humans and the environment. In addition, direct reuse of mineral processing wastewater will adversely affect the entire mine water system. Efficient treatment of residual butyl xanthate from tailing wastewater has recently attracted increasing interest. In this study, we compared the degradation efficiencies of cobalt iron oxide (CoFe 2 O 4 ) nanoparticles assisted by sulfite-activated advanced processes and persulfate (PDS) and peroxymonosulfate (PMS) advanced oxidation processes on butyl xanthate (BX) for the first time and explored possible reaction mechanisms in various systems. We conducted comprehensive experiments on the acid/alkali washed catalysts using oxidizing agents, obtaining catalysts best adapted to three degradation systems. Results of batch experiments indicated that the BX degradation rate for all the three systems exceeded 95 % within 60 min under their respective optimal conditions and that the best total organic carbon content (TOC) removal rate for these systems was 85.79 %. The effects of key factors, such as catalyst dosage, oxidant dosage, solution pH, and coexisting ions, on BX degradation were investigated. Furthermore, the active free radicals that played a major role in each system were detected via electron paramagnetic resonance (EPR). EPR results indicated that SO 3 ·− and ·O 2 − were the main active species of the CoFe 2 O 4 /sodium sulfite system, ·OH and ·O 2 − participated in the degradation of BX in the CoFe 2 O 4 /PDS system, and ·O 2 − was present in the CoFe 2 O 4 /PMS system. Thus, this study promotes the application of CoFe 2 O 4 with magnetism as a catalyst in wastewater treatment and provides new insights into the effective treatment of organic pollutants in tailing wastewater.
研究领域:
环境科学
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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
JOURNAL OF MOLECULAR LIQUIDS
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2024
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IF 5.3
Jiaozhong Cai,Youming Ye,Jiushuai Deng,Qiming Wu,Bozeng Wu,Zhiqiang Geng,Pingxuan Cheng,Huaibin Kang
A key strategy for achieving the selective separation of talc and chalcopyrite is the development of chemical depressants with high solubility and strong selectivity. Tannic acid (TA), a polyphenol found in green plants and has good solubility, contains abundant phenolic hydroxyl groups. Moreover, the adsorption mechanism of TA with chalcopyrite and talc was examined after TA was chosen as the separation depressant for chalcopyrite and talc. Single-mineral flotation test results found that at optimal pH and TA and sodium butyl xanthate (SBX) dosages, the flotation recoveries of talc and chalcopyrite were 9% and 92.17%, respectively, and the difference in recovery between them was 83.17%. Results from real ores and artificially mixed minerals tests also confirmed that TA can achieve selective separation of chalcopyrite and talc. Since chalcopyrite has distinct electrochemical properties, the results of atomic force microscope and electrochemical tests demonstrated that there are significant differences in the adsorption behavior of TA on the surface of chalcopyrite and talc. And the adsorption selectivity of SBX on the chalcopyrite surface is better than that of TA on the chalcopyrite surface, which is an important reason for the selective separation of chalcopyrite and talc.
研究领域:
化学工程
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矿物加工
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电化学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Anyang Huang,Jingyu He,Jinpeng Feng,Ciyuan Huang,Jinlin Yang,Wei Mo,Xiujuan Su,Bingsuo Zou,Shaojian Ma,Hongfei Lin,Hanzhong Jia,Zhengxian Pan,Tao Liu
The organic solar cell active layer, well known for excellent visible light response capability, is regarded as a potential candidate for photocatalytic degradation of organic wastewater. However, the poor dispersibility in water due to its hydrophobicity property severely limited the degrading efficiency. In this work, a novel composite photocatalyst PM6:IDT8CN-M/CK2 with a broad visible absorption spectrum and non-toxicity was first synthesized through the intercalation compounding method. A good dispersibility of PM6:IDT8CN-M in wastewater was achieved with the help of rich interlamellar porosity and good hydrophilicity of calcined kaolin. This composite photocatalyst was successfully applied to the SBX photocatalytic degradation in mineral processing wastewater, and the SBX pollutants can be completely degraded within 10 min under the condition of visible light irradiation. Compared with other reported photocatalysts, the photocatalytic degradation efficiency of SBX was dramatically improved by at least seven times. Moreover, PM6:IDT8CN-M/CK2 has remarkable stability, sustaining degradation efficiencies of over 90 % in 60 cycles. Notably, the organic solar cell active layer in PM6:IDT8CN-M/CK2 can achieve carrier rapid separation and transport, enhancing the generation of active oxides (∙O 2 – , and ∙OH, etc.). At the same time, the large surface area of PM6:IDT8CN-M/CK2 provides a suitable environment for the oxidation reaction of active radicals with SBX to achieve this efficient photocatalytic degradation. Overall, this work not only extends the application scope of organic solar cell active layer, but also develops a high-efficiency SBX removal technique for the treatment of mineral processing wastewater.
研究领域:
环境科学
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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
POWDER TECHNOLOGY
·
2025
·
IF 4.6
Qiming Zhuo,Decheng Chen,Zenan Wang,Wei Han,Yongming Song,Wenli Liu,Peng Xi
The separation of chalcopyrite and molybdenite in porphyry copper–molybdenum ores is challenging owing to their similar floatabilities, making the use of depressants necessary. Inorganic depressants are commonly employed in the flotation industry to increase the difference in hydrophobicity between chalcopyrite and molybdenite; however, these depressants pose significant environmental risks. Recently, novel organic depressants have attracted considerable interest because of their abundance and low toxicity. This study investigated the use of 2,5-dimercapto-1,3,4-thiadiazole (DMTD), an activator recently employed in copper oxide flotation, as a depressant for the separation of chalcopyrite and molybdenite. Micro–flotation experiments demonstrated that DMTD exhibits a notable selective depression effect, significantly suppressing the flotation of chalcopyrite without adversely affecting the flotation of molybdenite. Furthermore, DMTD maintained its depression effect on chalcopyrite flotation even in the presence of xanthate. Contact angle measurements were used to analyze changes in hydrophobicity, corroborating the micro–flotation results, while SEM-EDS elemental distribution maps further confirmed the selective adsorption of DMTD on the chalcopyrite surface. XPS and AFM analyses were conducted to elucidate the microscale interaction mechanism between DMTD and chalcopyrite. The specific interaction sites on the chalcopyrite surface were identified through changes in elemental binding energies, while the evolution of surface morphology revealed how DMTD interacts with chalcopyrite in the xanthate system.
研究领域:
矿物加工
·
冶金学
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表面化学
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环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2021
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IF 7.312
Jing Lou,Guanglu Lu,Ying Wei,Ying Zhang,Jiutao An,Mengke Jia,Menghong Li
In the study, dielectric barrier discharge (DBD) plasma was used to activate peroxymonosulfate (PMS) for synergetic degradation of residual potassium ethyl xanthate (PEX) in mineral separation wastewater. The degradation efficiency of PEX in the combined system was obviously higher, indicating that the system had a significant synergistic effect on PEX degradation. After 25 min, approximately 90.5% of PEX and 1.637 of synergetic factors were achieved in the DBD/PMS system at 27.5 kV. The increase of PMS concentration resulted in the balance between the consumption and formation reaction of active species. The degradation efficiency of PEX under acidic conditions was higher. The addition of Cl - , CO3 2– and HA had an inhibition effect on PEX degradation due to the consumption of ·OH and ·SO4 - , and the presence of Cu 2+ promoted PEX degradation. The introduction of EtOH had a significant inhibitory effect, indicating that ·SO4 - and ·OH played a crucial part. The addition of PMS increased the dissolved O3 and H2O2 concentration in the combined system. The COD degradation and TOC mineralization efficiency gradually improved with the extension of treatment time for actual xanthate wastewater. A possible degradation pathway of PEX was proposed based on the degradation products.
研究领域:
环境科学
·
化学工程
✓ 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）