Depression mechanism of sulfite ions on sphalerite and Pb^(2+)activated sphalerite in the flotation separation of galena from sphalerite  

作　　者：Feng Zhang Chenyang Zhang Linlin Wu Wei Sun Hongliang Zhang Jianhua Chen Yong Pei Songjiang Li 

机构地区：[1]Engineering Research Center of Ministry of Education for Carbon Emission Reduction in Metal Resource Exploitation and Utilization,Hunan International Joint Research Center for Efficient and Clean Utilization of Critical Metal Mineral Resources,School of Minerals Processing and Bioengineering,Central South University,Changsha 410083,China [2]State Key Laboratory of Mineral Processing,Beijing General Research Institute of Mining&Metallurgy,Beijing 100160,China [3]Hunan Provincial Key Laboratory of Micro&Nano Materials Interfaces Science,College of Chemistry and Chemical Engineering,Central South University,Changsha 410083,China [4]School of Resources,Environment and Materials,Guangxi University,Nanning 530004,China [5]Department of Chemistry,Xiangtan University,Xiangtan 411105,China [6]China Railway Resource Group Co.Ltd,Beijing 102300,China

出　　处：《International Journal of Minerals,Metallurgy and Materials》2025年第2期335-345,共11页矿物冶金与材料学报（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(No.52074356);Open Foundation of State Key Laboratory of Mineral Processing(No.BGRIMM-KJSKL-2023-06);the National Key R&D Program of China(No.2022YFC2904500);the Science and Technology Innovation Program of Hunan Province,China(No.2022RC1183);Changsha Science and Technology Project,China(Outstanding Innovative Youth Training Program);Innovation driven program of Central South University(No.2023CXQD002);National 111 Project(No.B14034);the Fundamental Research Funds for the Central Universities of Central South University Project(No.50621747)。

摘　　要：The depression mechanism of sulfite ions on sphalerite and Pb^(2+)activated sphalerite in the flotation separation of galena from sphalerite still lacked in-depth insight.Therefore,the depression mechanism of sulfite ions on sphalerite and Pb^(2+)activated sphalerite in the flotation separation of galena from sphalerite was further systematically investigated with experiments and density functional theory(DFT)calculations.The X-ray photoelectric spectroscopy(XPS)results,DFT calculation results,and frontier molecular orbital analysis indicated that sulfite ions were difficult to be adsorbed on sphalerite surface,suggesting that sulfite ions achieved depression effects on sphalerite through other non-adsorption mechanisms.First,the oxygen content in the surface of sphalerite treated with sulfite ions in creased,which enhanced the hydrophilicity of the sphalerite and further increased the difference in hydrophilicity between sphalerite and galena.Then,sulfite ions were chelated with lead ions to form PbSO_(3)in solution.The hydrophilic PbSO_(3)was more easily adsorbed on sphalerite than galena.The interaction between sulfite ions and lead ions could effectively inhibit the activation of sphalerite.In addition the UV spectrum showed that after adding sulfite ions,the peak of perxanthate in the sphalerite treated xanthate solution was significantly stronger than that in the galena with xanthate solution,indicating that xanthate interacted more readily with sulfite ions and oxygen mo lecules within the sphalerite system,leading to the formation of perxanthate.However,sulfite ions hardly depressed the flotation of ga lena and could promote the flotation of galena to some extent.This study deepened the understanding of the depression mechanism o sulfite ions on sphalerite and Pb^(2+)activated sphalerite.

关 键 词：SPHALERITE GALENA sulfite ion density functional theory depression mechanism 

分 类 号：TD952[矿业工程—选矿] TD923