首页|Ethylenediamine tetramethylenephosphonic acid as a selective collector for the improved separation of chalcopyrite against pyrite at low alkalinity
Ethylenediamine tetramethylenephosphonic acid as a selective collector for the improved separation of chalcopyrite against pyrite at low alkalinity
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Chalcopyrite is the main Cu-containing mineral and cannot be separated well from pyrite using tradi-tional xanthate collectors with large amounts of lime depressant, resulting in difficulties of the tailing treatment and associated precious metals recovery. Therefore, in this study, the green and odourless ethylenediamine tetramethylenephosphonic acid (EDTMPA) was introduced as a novel chalcopyrite col-lector. Flotation results from the binary mineral mixture and real ore demonstrated that EDTMPA could realize the selective separation of chalcopyrite from pyrite relative to ethyl xanthate (EX) without any depressants within the wide pH range of 6.0–11.0, and might replace the traditional high-alkaline lime process. Electrochemical and Fourier transform infrared spectra measurements indicated that the differ-ence in adsorption performance of EDTMPA on chalcopyrite and pyrite was larger than that of EX, sug-gesting a better selectivity for EDTMPA. Density functional theory calculations demonstrated that there were stronger chemical bonds between P—O groups of EDTMPA and the Fe/Cu atoms on chalcopy-rite in the form of a stable six-membered ring. Crystal chemistry calculations further revealed that the activity of metal atoms of chalcopyrite was higher than that of pyrite. Therefore, these basic theoretical results and practical application provide a guidance for the industrial application of EDTMPA in chalcopy-rite flotation.
School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China
Key Laboratory of Hunan Province for Clean and Efficient Utilization of Strategic Calcium-containing Mineral Resources, Central South University, Changsha 410083, China
Hunan International Joint Research Centre for Efficient and Clean Utilization of Critical Metal Mineral Resources, Central South University, Changsha 410083, China
Key Program for International Science and Technology Cooperation Projects of China国家自然科学基金Leading Talents of S&T Innovation of Hunan Province,ChinaScience Fund for Distinguished Young Scholars of Hunan Province,China湖南省重点研发计划National 111 Project,China
NETL
NSTL
万方数据
维普
