Minerals
·
2019
·Vol. 9
·期 8
·463
·
IF 2.25
Yuqing Huang,Wanzhong Yin,Rongdong Deng,Dingquan Xing,Feng Rao
The conventional sulfidation-xanthate flotation process that consists of sulfidization with sodium sulfide, activation by heavy-metal ions, and collection with xanthate is not sufficiently efficient for treating hemimorphite, and the dosages of the sulfurizing reagent and metal ions are large. In this study, the sulfidation flotation (Pb2++ Na2S + Pb2++ xanthate) of hemimorphite was strengthened by pretreating with Pb2+before sulfidation. Microflotation test results indicated that the recovery of hemimorphite increased by 5–10% after pretreatment with Pb2+. The comprehensive results of adsorption experiments, scanning electron microscopy–energy-dispersive X-ray spectroscopy, atomic force microscopy, and X-ray photoelectron spectroscopy indicated that a large amount of Pb2+was adsorbed on the hemimorphite surface and entered the lattice, forming Zn(4−x)PbxSi2O7(OH)2·H2O. The newly formed component had an increased amount of surface sulfidation active sites and had the effect of induced crystallization, making the surface more effective for sulfidation. After the Pb2+was added to the pulp, a large number of uniform and dense PbS species were formed on the hemimorphite surface, increasing the number of adsorption sites for xanthate and reducing the competitive adsorption of residual S2−on the xanthate.Keywords:hemimorphite;flotation;strengthening sulfidation;pretreatment;lead ion
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
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
·
2022
·
IF 3.752
Qian WEI,Liu-yang DONG,Cong-ren YANG,Xue-duan LIU,Fen JIAO,Wen-qing QIN
Lime (CaO) and sodium humate (NaHA) were used as the combined depressant for arsenopyrite pre-treated by CuSO 4 and butyl xanthate. Micro-flotation tests show that the combined depressant CaO and NaHA achieved the selective depression of arsenopyrite. Closed-circuit lab-scale test results indicate that the synergistic effect of CaO+NaHA achieved a satisfactory flotation separation of sphalerite and arsenopyrite, for which the Zn grade and recovery of Zn concentrate were 51.21% and 92.21%, respectively. Contact angle measurements, adsorption amount measurements and X-ray photoelectron spectroscopy analysis indicate that the dissolved calcium species (mainly as Ca 2+ ) were adsorbed on the mineral surfaces, thereby promoting NaHA adsorption. Moreover, the surface of the arsenopyrite absorbed more amount of calcium species and NaHA than that of the sphalerite, thereby accounting for the strong hydrophilic surface of arsenopyrite. The adsorption of NaHA on arsenopyrite was mainly chemical adsorption through its carboxyl groups and Ca atoms, whereas that on sphalerite surface was relatively weak.
研究领域:
矿物加工工程
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化学工程
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DOI
高影响因子
Minerals
·
2025
·Vol. 15
·期 1
·82
·
IF 2.2
Longqian Ni,Jinfang Lv,Lingyu Kong,Longwei Qin
Sphalerite often co-exists with dolomite, a carbonate mineral containing calcium and magnesium. In the flotation process of sphalerite, dolomite entering into the concentrate will have a considerable negative impact on the subsequent smelting. Therefore, the effects of sodium silicate on the flotation separation of sphalerite and dolomite and its mechanism were investigated in this study. It was found that alkaline conditions and the addition of sodium silicate were conducive to the flotation separation of sphalerite and dolomite. Under alkaline conditions, sodium silicate improved the hydrophobicity of sphalerite and the slurry turbidity. The yield stress and apparent viscosity were significantly reduced when dolomite was present in slurry. In addition, the surface electrical properties of dolomite shifted from positive to negative with an increase in the dosage of sodium silicate at pH 11, leading to electrostatic repulsion between sphalerite and dolomite. EDLVO results indicated that the total interaction energy between dolomite and sphalerite particles was repulsive when sodium silicate was present. This study provided a theoretical basis for the flotation separation of sphalerite and dolomite.
研究领域:
矿物加工工程
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化学工程
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DOI
高影响因子
Journal of the Taiwan Institute of Chemical Engineers
·
2024
·
IF 5.5
Linquan Dai,Bo Feng,Yutao Guo
Background Sphalerite and galena often exist in mixed form and are difficult to separate effectively. The effect of surface oxidation behavior regulation on the depression of calcium lentisulfonate (CLS) was studied in galena and sphalerite. Methods Flotation experiment, contact angle experiment, X-ray photoelectron spectroscopy (XPS) analysis and microcalorimetric experiment were used to study the effect and mechanism of modulation of surface oxidation behaviour on CLS on the depression of galena flotation. Significant findings The results show that CLS can depress both galena and sphalerite. The oxidizing agent H 2 O 2 oxidizes galena significantly faster than sphalerite. The treatment with H 2 O 2 induces the formation of more oxidation products, such as PbSO 4, on the surface of galena, enhances the adsorption of CLS and makes the surface of galena hydrophilic, thus reducing the recovery of galena in the flotation process. On the other hand, the treatment of the activator ethylenediaminetetraacetic acid (EDTA) reduces the amount of oxidation products ZnSO 4 on the sphalerite surface, and CLS loses the active site that can be adsorbed on the galena surface, making the galena surface hydrophilic. In view of the huge hydrophobicity difference between sphalerite and galena, flotation separation is achieved.
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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DOI
高影响因子
ADSORPTION SCIENCE & TECHNOLOGY
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2021
·
IF 4.232
Bo Yang,Xian Xie,Xiong Tong,Lingyun Huang
Terpenic oil (TO) is commonly used as a flotation frother for the selective separation of sulfide minerals. As a frother, most reports have mainly focused on its effect on froth stability and froth entrainment, whereas its influence on the floatability of sulfide minerals has received little attention. In this work, the influence of TO on the flotation behavior of sphalerite was investigated by using microflotation tests, contact angle and zeta potential measurements, and FT-IR and SEM-EDS analyses. Microflotation tests conducted in a modified Hallimond tube indicated that compared with the collector potassium butyl xanthate (KBX), the flotation recovery of sphalerite was significantly increased when TO was added to the pulp, but the recovery of Cu-activated sphalerite with the addition of TO was lower than that with the addition of KBX. Contact angle measurements demonstrated that the contact angle of sphalerite was distinctly increased by the addition of TO, but the contact angle of sphalerite treated with TO was lower than that treated with KBX after Cu activation. Zeta potential measurements demonstrated that the zeta potential of sphalerite particles was slightly decreased when treated with TO, and the isoelectric point (IEP) was decreased from 3.3 to 3.1 due to the interaction of TO with sphalerite particles. FT-IR and SEM-EDS confirmed that TO could be adsorbed on the sphalerite surface on the formation of the oil film due to its low solubility, thereby increasing the surface hydrophobicity of the sphalerite. In addition, the TO absorbed on the surface acts as a bridging role and promotes the hydrophobic agglomeration of sphalerite particles. These results suggest that except for froth entrainment, the influence of TO on the flotation behavior of sphalerite may be another reason for the misreporting of sphalerite in concentrates.
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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DOI
高影响因子
HYDROMETALLURGY
·
2019
·
IF 3.465
Yisheng Zhang,Hongbo Zhao,Yanjun Zhang,Hongwei Liu,Huaqun Yin,Jiushuai Deng,Guanzhou Qiu
Sulphide minerals commonly existing in the form of polymetallic ores are the essential objects in the fields of acid mine drainage and biohydrometallurgy. Although interactions between different minerals have been studied extensively, there are no research reports on the interactions between marmatite and chalcocite. Hence, the interactions between marmatite and chalcocite in biotic/abiotic leaching and electrochemical systems were investigated. Electrochemical tests show that the open circuit potential of marmatite is 39 mV lower than that of chalcocite. Theoretically, marmatite should react as an anode in this galvanic couple, thus dissolving faster. However, leaching results suggest that the introduction of marmatite promotes chalcocite dissolution but its own dissolution was impeded, despite a slight acceleration observed during the early stage in abiotic systems. The results of this study reveal that the solution factors including oxidation-reduction potential, iron concentrations, and microbial concentrations might have significant effects that are more potent than the galvanic effect. The unpredictable inhibition of marmatite dissolution might be attributable to the existence of excess Cu 2+ liberated from the chalcocite. A further deduction proposed that a synergistic dissolution of marmatite and chalcocite can be achieved by adjusting their mass ratios to attain a suitable Cu 2+ concentration.
研究领域:
矿物学
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生物冶金学
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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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2025
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IF 5.4
Manman Liu,Chen Cheng,Luyao Wang,Zhaohui Qiu,Sheng Liu,Wei Chen,Guangyi Liu
Under the traditional sulfhydryl collector system, the flotation enrichment of sphalerite requires the addition of copper ions to pre-activate sphalerite, and the separation of sphalerite and pyrite can be realized under high alkali conditions, which is not environmentally friendly. Therefore, it is urgent to develop highly selective collectors to achieve green separation of sphalerite and pyrite without copper ion activation and under low alkali conditions. In this study, 2-dibutylamino-4(1 H)-thione-6-thiol-1,3,5-triazine (DBN) was first selected as a specific collector for flotation separation of sphalerite from pyrite, and the selective hydrophobic mechanism of DBN on sphalerite surface was emphatically investigated. UV spectra showed a selective affinity of DBN towards zine ions rather than iron ions. The results of adsorption capacity indicated that under pH 4.0 ∼ 6.0, the adsorption amount of DBN on sphalerite was much higher than that on pyrite. In-situ atomic force microscopy (AFM) images combined with Contact Angle distinctly exhibited that the self-assembly of DBN on sphalerite improved its surface hydrophobicity. Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS) revealed that DBN chemisorbed on sphalerite surface via bonding DBN’s exo -S atom with surface Zn atom. Due to the selective adsorption, DBN efficiently floated out sphalerite from pyrite at natural pH (∼5.9) in the absence of extra agents such as lime, activators and depressants. Therefore, DBN achieved the green separation and enrichment of sphalerite from pyrite, which offered a novel insight for developing green and efficient collectors.
研究领域:
矿物加工工程
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环境科学
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DOI
高影响因子
JOM
·
2023
·Vol. 75
·期 11
·4808-4818
·
IF 2.6
Zhang Feng,Sun Wei,Zhang Hongliang,Chen Daixiong,Li Songjiang,Chen Jianhua,Zhang Chenyang
In this study, selective adsorption mechanism of zinc ions on the surfaces of galena and sphalerite in the flotation separation of Pb-Zn was comprehensively explored by flotation tests, Zeta potential measurements, Fourier transform interferometric radiometer (FTIR) spectroscopy, X-ray photoelectron spectroscopy (XPS) analysis, and density functional theory (DFT) calculations. Microflotation test showed that the use of ZnSO 4 in alkaline pulp could selectively separate galena from sphalerite better than that without ZnSO 4 . Zeta potential test results showed that ZnSO 4 could significantly increase the Zeta potential of sphalerite under alkaline conditions, but had little effect on galena. The results of FTIR test showed that xanthan characteristic peak appeared in xanthate-treated galena at pH = 10, while sphalerite treated with xanthate did not. XPS and DFT calculation results showed that sphalerite had stronger adsorption capacity for hydroxyl ions than galena. DFT calculation further confirmed that Zn(OH) 2 could be adsorbed on the surface of hydroxylated sphalerite instead of hydroxylated galena and formed a new interface microstructure of sphalerite (Zn surf -O-Zn-O-H), resulting in the inhibition of sphalerite. This paper further deepened the selective adsorption mechanism of zinc ions on the surface of sphalerite in the flotation separation of Pb-Zn under alkaline conditions.
研究领域:
矿物加工工程
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物理化学
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产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2018
·
IF 2.829
Jingqin Qin,Guangyi Liu,Hongli Fan,Wen Tan
In this paper, the flotation separation of hemimorphite from quartz was investigated by using di(2-ethylhexyl) phosphoric acid (DEHPA) as a collector. The results elucidated that DEHPA exhibited better flotation performances to hemimorphite than dibutyl phosphoric acid (DBP), tributyl phosphate (TBP), octanoic acid (OA) and palmitic acid (PA). And DEHPA also possessed good selectivity against quartz flotation and could realize the effective flotation separation of hemimorphite from quartz under pH 6.0–10.0. The adsorption and contact angle findings clearly indicated that DEHPA selectively adsorbed on hemimorphite, hardly on quartz. After DEHPA treatment, the hydrophobicity of hemimorphite was dramatically improved. Zeta potential suggested that DEHPA anion anchored on hemimorphite surfaces mainly through chemical bonds. FTIR inferred that DEHPA chemisorbed on to hemimorphite surfaces by formation of the Zn O bonds between the O atoms of the P( O)(OH) group and the surface zinc atoms, simultaneously with splitting the O H bonds of the P O H group. XPS gave clear evidences that the adsorbed DEHPA combined with Zn(II) species on hemimorphite surfaces to generate the Zn(II)-DEHPA surface complexes.
研究领域:
矿物加工工程
·
表面化学
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Jinchan Feng,Bingqiao Yang,Huanyu Zhu,Hanquan Zhang,Mengyuan Zeng
In this work, 2-phosphonobutane-1,2,4-tricarboxylic acid (PBTCA) was explored as a novel sphalerite depressant in the selective flotation of galena from sphalerite. The separation performances were investigated by single and synthetic flotation tests. The depression mechanism was examined by Fourier Transform Infrared spectroscopy (FTIR), zeta potential and X-ray Photoelectron Spectroscopy (XPS) analysis. The flotation test results showed that PBTCA was an effective sphalerite depressant with good selectivity at broad pH range, which could achieve satisfactory separation results. Zeta potential and FTIR results indicated that PBTCA was more prone to adsorb on sphalerite surface than that of galena. In addition, SIBX could replace adsorbed PBTCA on the galena surface while it was impossible to substitute that on the sphalerite surface, which rendered sphalerite surface hydrophilic and enlarged the floatability difference. XPS analysis manifested that PBTCA was adsorbed on sphalerite surface through the strong complexation between carboxyl, phosphonic acid groups and Zn sites on sphalerite surface, forming C-O-Zn or P-O-Zn bond.
研究领域:
矿物加工工程
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表面化学
✓ 已验证
DOI
高影响因子
Journal of Cleaner Production
·
2021
·
IF 9.297
Huanyu Zhu,Bingqiao Yang,Jinchan Feng,Feifei Jia
In this work, an environment-friendly sphalerite depressant 1-hydroxyethylidene-1,1-diphosphonic acid (HEDP) was exploited in the flotation separation of sphalerite and galena . The flotation performances of sphalerite and galena treated by HEDP were investigated by mineral flotation tests. The depression mechanisms of HEDP on sphalerite were investigated by various characterization techniques such as zeta potential tests, Fourier Transform Infrared Spectrometer (FTIR), X-ray Photoelectron Spectroscopy (XPS) analysis, Time of Flight Secondary Ion Mass Spectrometry (ToF-SIMS) and density functional theory (DFT) calculation. Flotation tests showed that HEDP selectively depressed sphalerite but almost did not influence the flotation of galena in sodium isobutyl xanthate (SIBX) system, which achieved effective flotation separation results. zeta potential tests and FTIR results proved the preferential adsorption of HEDP on sphalerite surface, but the pre-adsorbed of HEDP on galena could be replaced by SIBX easily. XPS, ToF-SIMS analysis and DFT calculation demonstrated that HEDP was coordinated with Zn atom through two different phosphonic acid group, forming a six membered chelating ring.
研究领域:
矿物加工工程
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环境科学
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材料化学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Yuangan Chen,Bo Feng,Jinxiu Peng,Ziming Wang
An effective reagent combination plays a crucial role in the flotation separation of galena and sphalerite. In this work, potassium permanganate (KMnO 4 ) was used to amplify the property difference between galena and sphalerite, carboxylated chitosan (CCS) was used to selectively depress sphalerite. The mechanism of CCS in the separation of galena and sphalerite was investigated by microcalorimetric measurements, X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared (FTIR) spectroscopy. The results indicated that the rate of sphalerite oxidation by KMnO 4 is significantly faster than galena, and more metal oxides will be produced on the surface of sphalerite. The metal oxides provided active sites for CCS to adsorb on the surface of sphalerite via chemisorption, and the adsorption of CCS hindered the further adsorption of potassium butylxanthate (PBX). Meanwhile, the slower oxidation rate of galena means that fewer metal oxides are produced. In addition, CCS is mainly adsorbed on the surface of galena through physical adsorption, which is easy to fall off, so the surface of galena can further adsorb PBX. Thus, flotation separation of galena and sphalerite is achieved.
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
危险品化学品经营许可证（带存储）