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Flotation behaviors of chalcopyrite and galena using ferrate(Ⅵ) as a depressant

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International Journal of Mining Science and Technology 2023年第1期33卷 93-103页

作者： Yongxing Zheng Yusong Huang Panjin Hu Xianhui Qiu Jinfang Lv Lingyun Bao State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization Kunming University of Science and TechnologyKunming 650093China Faculty of Land Resource Engineering Kunming University of Science and TechnologyKunming 650093China Faculty of Resource and Environmental Engineering Jiangxi University of Science and TechnologyGanzhou 341000China

This paper investigated the effects of potassium ferrate(PF)on the Flotation performances of chalcopyrite and galena.The Flotation results showed that PF obviously depressed galena,but had little effects on the floatability of chalcopyrite within pH range of 4.0–12.0.Zeta potential tests showed that the addition of PF induced the formation of more amounts of hydrophilic species on the surface of galena under an alkaline environment.Industrial grade O-isopropyl-N-ethyl thionocarbamate(IPETC)chemically adsorbed on the surface of the PF-treated chalcopyrite and galena after its addition.Contact angle measurements showed that with the addition of PF,the contact angle of the galena surface significantly decreased compared with the chalcopyrite surface.Localized electrochemical impedance spectroscopy(LEIS)tests showed that the addition of PF increased the impedance of the galena surface.X-ray photoelectron spectroscopy(XPS)analyses revealed that the formation of hydrophilic species,namely lead sulfite,lead hydroxide and ferric hydroxide,on the galena surface,decreased its floatability in the presence of PF,while the formation of hydrophobic species,namely copper disulfide and elemental sulfur,on the chalcopyrite surface,maintained its floatability.Finally,a descriptive model for the reaction of PF with chalcopyrite and galena was proposed.

关键词： Flotation Chalcopyrite Galena Potassium ferrate

Latest advances and progress in the microbubble Flotation of fine minerals:Microbubble preparation,equipment,and applications

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International Journal of Minerals,Metallurgy and Materials 2023年第7期30卷 1244-1260页

作者： Ziyong Chang Sensen Niu Zhengchang Shen Laichang Zou Huajun Wang Civil and Resource Engineering School University of Science and Technology BeijingBeijing 100083China State Key Laboratory of Comprehensive Utilization of Low-Grade Refractory Gold Ores Shanghang 364200China BGRIMM Technology Group State Key Laboratory of Mineral ProcessingBeijing 100160China

In the past few decades,microbubble Flotation has been widely studied in the separation and beneficiation of fine minerals.Compared with conventional Flotation,microbubble Flotation has obvious advantages,such as high grade and recovery and low consumption of Flotation reagents.This work systematically reviews the latest advances and research progress in the Flotation of fine mineral particles by microbubbles.In general,microbubbles have small bubble size,large specific surface area,high surface energy,and good selectivity and can also easily be attached to the surface of hydrophobic particles or large bubbles,greatly reducing the detaching probability of particles from bubbles.Microbubbles can be prepared by pressurized aeration and dissolved air,electrolysis,ultrasonic cavitation,photocatalysis,solvent exchange,temperature difference method(TDM),and Venturi tube and membrane method.Correspondingly,equipment for fine-particle Flotation is categorized as microbubble release Flotation machine,centrifugal Flotation column,packed Flotation column,and magnetic Flotation machine.In practice,microbubble Flotation has been widely studied in the beneficiation of ultrafine coals,metallic minerals,and nonmetallic minerals and exhibited superiority over conventional Flotation machines.Mechanisms underpinning the promotion of fine-particle Flotation by nanobubbles include the agglomeration of fine particles,high stability of nanobubbles in aqueous solutions,and enhancement of particle hydrophobicity and Flotation dynamics.

关键词： microbubble preparation Flotation fine minerals Flotation equipment bubble-particle interaction

Synergistic effects of dodecane-castor oil acid mixture on the Flotation responses of low-rank coal:A combined simulation and experimental study

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International Journal of Mining Science and Technology 2023年第5期33卷 649-658页

作者： Fen Xu Shiwei Wang Rongjie Kong Chengyong Wang College of Environmental and Chemical Engineering Dalian UniversityDalian 116622China School of Mines and Mechanical Engineering Liupanshui Normal UniversityLiupanshui 553004China

The utilization of an appropriate collector or surfactant is crucial for the beneficiation of low-rank coal.However,in previous studies,the selection of surfactants was primarily based on Flotation procedures,which hinders the understanding of the interaction mechanism between surfactant groups and oxygen-containing functional groups at the surface of low-rank coal.In this study,we investigate the Flotation of low-rank coal in the presence of a composite collector by using a combined theoretical and experimental approach.The maximum Flotation mass recovery achieved was 82.89%using a 3:1 mixture of dodecane and castor oil acid.Fourier-transform infrared and X-ray photoelectron spectroscopic analyses showed that castor oil acid was effectively adsorbed onto the surface of low-rank coal,enhancing the hydrophobicity of the coal.In addition,the diffusion coefficient of water molecules in the water-composite collector-coal system was greater than that in the dodecane system.Moreover,due to the presence of castor oil acid in the Flotation process,the adsorption distance of dodecane and low-rank coal became shorter.Molecular dynamics simulations revealed that the diffusion and interaction of surfactant molecules at the interface of low-rank coal particles and water was enhanced because the adsorption of the dodecane-castor oil acid mixture is primarily controlled by hydrogen bonds and electrostatic attraction.Based on these results,a better surfactant for Flotation of low-rank coal is also proposed.

关键词： Low-rank coal Flotation Castor oil acid Surface hydrophobicity Molecular dynamics simulation

Preparation of cinnamic hydroxamic acid collector and study on Flotation characteristics and mechanism of scheelite

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International Journal of Mining Science and Technology 2023年第6期33卷 773-781页

作者： Xiang Yao Xinyang Yu Liping Wang Yuhui Zeng Linghan Mao Shanming Liu Honghui Xie Guichun He Zhiqiang Huang Zhilin Liu Jiangxi Provincial Key Laboratory of Mining Engineering Ganzhou 341000China School of Resource and Environment Engineering Jiangxi University of Science and TechnologyGanzhou 341000China Yongping Copper Mine Jiangxi Copper Co.LTD.Shangrao 334000China

In this paper,using methyl cinnamate as raw material,the new cinnamic hydroxamic acid collector(CIHA)was synthesized by the hydroxylamine method.The collector performance of hydroxamic acid was investigated for scheelite and gangue calcite,and the Flotation separation test of scheelite and calcite was carried out with CIHA as the collector.The interaction mechanism between hydroxamic acid and scheelite minerals has also been investigated through zeta potential,Fourier transform infrared spectroscopy(FTIR)experiments,X-ray photoelectron spectroscopy(XPS)experiments,and density functional theory(DFT)calculation.The single mineral Flotation test and artificially mixed ore showed that CIHA had an excellent collection effect and selectivity.Zeta potential,FTIR,and XPS showed that CIHA was adsorbed on the scheelite surface by strong chemical adsorption.The active group of CIHA was analyzed through quantum chemical calculation.It was speculated that C=O and N-O bonds could synthesize a five-membered chelated hydroxamic acid group with Ca element chelate on scheelite surface,changing hydrophobicity and making it more likely to emerge from the pulp.

关键词： Hydroxamic acid CIHA Flotation Scheelite

Flotation separation of scheelite from calcite using luteolin as a novel depressant

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International Journal of Minerals,Metallurgy and Materials 2024年第3期31卷 462-472页

作者： Xiaokang Li Ying Zhang Haiyang He Yu Wu Danyu Wu Zhenhao Guan Faculty of Land and Resources Engineering Kunming University of Science and TechnologyKunming 650093China State Key Laboratory of Clean Utilization of Complex Non-Ferrous Metal Resources Kunming University of Science and TechnologyKunming 650093China

This paper proposes luteolin(LUT)as a novel depressant for the Flotation-based separation of scheelite and calcite in a sodium oleate(NaOL)system.The suitability of LUT as a calcite depressant is confirmed through micro-Flotation testing.At pH=9,with LUT concentration of 50 mg·L^(-1) and NaOL concentration of 50 mg·L^(-1),scheelite recovery reaches 80.3%.Calcite,on the other hand,exhibits a recovery rate of 17.6%,indicating a significant difference in floatability between the two minerals.Subsequently,the surface modifica-tions of scheelite and calcite following LUT treatment are characterized using adsorption capacity testing,Zeta potential analysis,Fourier transform infrared spectroscopy(FT-IR),X-ray photoelectron spectroscopy(XPS),and atomic force microscopy(AFM).The study in-vestigates the selective depressant mechanism of LUT on calcite.Adsorption capacity testing and Zeta potential analysis demonstrate sub-stantial absorption of LUT on the surface of calcite,impeding the further adsorption of sodium oleate,while its impact on scheelite is min-imal.FT-IR and XPS analyses reveal the selective adsorption of LUT onto the surface of calcite,forming strong chemisorption bonds between the hydroxyl group and calcium ions present.AFM directly illustrates the distinct adsorption densities of LUT on the two miner-al types.Consequently,LUT can effectively serve as a depressant for calcite,enabling the successful separation of scheelite and calcite.

关键词： scheelite calcite luteolin Flotation depressant separation

Application of EDTMPS as a novel calcite depressant in scheelite Flotation

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International Journal of Mining Science and Technology 2023年第5期33卷 639-647页

作者： Fen Jiao Wei Li Xu Wang Congren Yang Zhengquan Zhang Liwen Fu Wenqing Qin School of Minerals Processing and Bioengineering Central South UniversityChangsha 410083China Key Laboratory of Hunan Province for Clean and Efficient Utilization of Strategic Calcium-containing Mineral Resources Central South UniversityChangsha 410083China

In this study, the innovative use of ethylenediamine tetramethylene phosphonic sodium(EDTMPS) as a calcite depressant in scheelite Flotation was investigated by Flotation experiments, and its selective depression mechanism was revealed by contact angle measurement, FTIR analysis, Zeta potential test and XPS analysis. The Flotation experiment results showed that scheelite and calcite could be efficiently separated under the following conditions: pulp p H=9.5, Na OL concentration of 1.5×10^(-4)mol/L, EDTMPS concentration of 3.0×10^(-5)mol/L, a scheelite concentrate with WO3grade of 65.49%, recovery of 83.29%and separation efficiency of 65.29% could be obtained from the artificially mixed minerals. The analysis results of mineral surface properties demonstrated that EDTMPS was strongly adsorbed onto the calcite surface through the reaction between the phosphonate group and the calcium ions, which hindered Na OL adsorption and increased the hydrophilicity of calcite. However, EDTMPS had weak adsorption strength on the scheelite surface, which didn’t affect further adsorption of Na OL, hence, the scheelite remained hydrophobic. Consequently, the selective adsorption of EDTMPS on the two minerals’ surfaces increased a difference in wettability and thus enabling them to be separated by Flotation. Finally, the mechanism model of this Flotation separation process was established.

关键词： Ethylenediamine tetramethylene phosphonic sodium Scheelite Calcite Flotation Selective depression

Rheological investigations of the improved fine scheelite Flotation spiked with agitation medium

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International Journal of Mining Science and Technology 2022年第6期32卷 1379-1388页

作者： Wei Chen Guofan Zhang Yangge Zhu College of Chemistry and Chemical Engineering Central South UniversityChangsha 410083China State Key Laboratory of Mineral Processing BGRIMM Technology GroupBeijing 100160China School of Mineral Processing and Bioengineering Central South UniversityChangsha 410083China

The fine scheelite Flotation using garnet and glass beads as agitation medium was investigated through slurry rheology and froth property analysis. The apparent viscosity of fine scheelite, calcite and quartz(-20 μm) slurry were measured and the corresponding scheelite Flotation behaviours, froth water recovery and froth height were studied. It was found that calcite slurry could aggregate into network structures and exhibit much higher apparent viscosity at the vicinity of pH 8.5–9.0 than scheelite and quartz(scheelite, calcite, and quartz slurry at 20.34, 38.66, and 14.58 mPa·s, respectively). Agitation medium containing garnet and glass beads could reduce the slurry apparent viscosity by effectively dispersing the calcite network structures in Flotation slurry, and improve the fine scheelite Flotation selectivity. As the apparent viscosity was reduced, the froth water recovery decreased from 24.33% to 6.37% and initial froth height of the Flotation froth decreased from 69.6 to 8.7 mm, and finally results in increase in separation efficiency from 23.10% to 31.96%. The results could be potentially used in Flotation of fine minerals by applying agitation medium to improve the process selectivity.

关键词： Rheology Flotation Fine scheelite Agitation medium

Flotation separation of wolframite from calcite using a new trisiloxane surfactant as collector

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International Journal of Mining Science and Technology 2023年第3期33卷 379-387页

作者： Shuyi Shuai Zhiqiang Huang Vladimir E.Burov Vladimir Z.Poilov Fangxu Li Hongling Wang Rukuan Liu Shiyong Zhang Chen Cheng Wenyuan Li Xinyang Yu Guichun He Weng Fu Jiangxi Province Key Laboratory of Mining Engineering Jiangxi University of Science and TechnologyGanzhou 341000China Department of Chemical Engineering Perm National Research Polytechnic UniversityPerm 614990Russia Guangdong Institute of Resources Comprehensive Utilization Guangzhou 510650China Hunan Academy of Forestry Changsha 410004China School of Chemical Engineering University of QueenslandSt Lucia 4072 QLDAustralia

Since wolframite is usually associated with calcite,the separation and enrichment of wolframite by froth Flotation remains a great challenge.Herein,a novel trisiloxane surfactant N-(2-aminoethyl)-3-ami nopropyltrisiloxane(AATS)was successful synthesized,which was used for the separation of wolframite from calcite for the first time.The Flotation separation performance of AATS was studied by Flotation test,and its adsorption mechanism was explored based on contact angle,infrared spectrum analysis(FTIR),zeta potential and density functional theory(DFT)calculation.The results of microFlotation test and binary mixed ore Flotation test pointed that AATS had excellent selectivity and more prominent collection capacity for the Flotation of wolframite when compared with industrial reagent sodium oleate(NaOL).The measurement results of contact angle proved that AATS improved the hydrophobicity of the wolframite surface.The highly selective adsorption mechanism of AATS surfactant on mineral surfaces were further researched and analyzed by FTIR and zeta potential.The results revealed that AATS surfactant had significant adsorption effect on wolframite,yet almost no adsorption on calcite.DFT calculation indicated that AATS produced electrostatic adsorption with wolframite surface through—N+H3 group.

关键词： Flotation Wolframite Calcite Trisiloxane surfactant Adsorption

Enhanced inhibition of talc Flotation using acidified sodium silicate and sodium carboxymethyl cellulose as the combined inhibitor

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International Journal of Minerals,Metallurgy and Materials 2023年第7期30卷 1310-1319页

作者： Jiwei Xue Huazhen Tu Jin Shi Yanni An He Wan Xianzhong Bu School of Resources Engineering Xi’an University of Architecture and TechnologyXi’an 710055China State Key Laboratory of Mineral Processing Beijing 100260China Northern Engineering&Technology Corporation Dalian 116600China

The Flotation separation of chalcopyrite and talc is challenging due to their similar natural floatability characteristics.Besides,it is usually difficult to effectively inhibit talc by adding sodium carboxymethyl cellulose(CMC)alone during chalcopyrite Flotation.Here,a combined inhibitor comprising acidified sodium silicate(ASS)and CMC was employed to realize effective Flotation separation of chalcopyrite and talc,and the combined inhibition mechanism was further investigated.MicroFlotation results showed that adding ASS strengthened the inhibitory effect of CMC on talc and improved the separation of chalcopyrite and talc.The zeta potential,Fourier transform infrared,and X-ray photoelectron spectroscopy analysis indicated that CMC was mainly adsorbed on the talc surface via hydroxyl and carboxyl groups.Moreover,the addition of ASS improved the adsorption of carboxyl groups.Furthermore,the adsorption experiments and apparent viscosity measurements revealed that adding ASS dispersed the pulp well,which reduced the apparent viscosity,improved the adsorption amount of CMC on the talc surface,and enhanced the inhibition of talc in chalcopyrite Flotation.

关键词： talc chalcopyrite Flotation combined inhibitor apparent viscosity