Ethylenediamine tetramethylenephosphonic acid as a selective collector for the improved separation of chalcopyrite against pyrite at low alkalinity  

作　　者：Jianjun Wang Gaogui Jing Renji Zheng Zijie Huang Wei Sun Zhiyong Gao 

机构地区：[1]School of Minerals Processing and Bioengineering,Central South University,Changsha 410083,China [2]Key Laboratory of Hunan Province for Clean and Efficient Utilization of Strategic Calcium-containing Mineral Resources,Central South University,Changsha 410083,China [3]Hunan International Joint Research Centre for Efficient and Clean Utilization of Critical Metal Mineral Resources,Central South University,Changsha 410083,China

出　　处：《International Journal of Mining Science and Technology》2023年第7期873-882,共10页矿业科学技术学报（英文版）

基　　金：financial supports from the Key Program for International S&T Cooperation Projects of China (No. 2021YFE0106800);the National Natural Science Foundation of China (No. U2067201);the Leading Talents of S & T Innovation of Hunan Province, China (No. 2021RC4002);the Science Fund for Distinguished Young Scholars of Hunan Province, China (No. 2020JJ2044);the Key Research and Development Program of Hunan Province, China (No. 2021SK2043);the National 111 Project, China (No. B14034)。

摘　　要：Chalcopyrite is the main Cu-containing mineral and cannot be separated well from pyrite using traditional 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 collector. 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 p H 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 difference in adsorption performance of EDTMPA on chalcopyrite and pyrite was larger than that of EX, suggesting 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 chalcopyrite 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 chalcopyrite flotation.

关 键 词：CHALCOPYRITE PYRITE Flotation Ethylenediamine tetramethylenephosphonic acid COLLECTOR 

分 类 号：TD923.13[矿业工程—选矿] TD95