Abstract
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.
基金项目
Key Program for International Science and Technology Cooperation Projects of China(2021YFE0106800)
国家自然科学基金(U2067201)
Leading Talents of S&T Innovation of Hunan Province,China(2021RC4002)
Science Fund for Distinguished Young Scholars of Hunan Province,China(2020JJ2044)
湖南省重点研发计划(2021SK2043)
National 111 Project,China(B14034)
NETL
NSTL
维普
万方数据