Mechanochemical sulfidization of a mixed oxide-sulphide copper ore by co-grinding with sulfur and its effect on the flotation efficiency  

作　　者：Mojtaba Masdarian Asghar Azizi Zahra Bahri 

机构地区：[1]Faculty of Mining,Petroleum and Geophysics,Shahrood University of Technology,Shahrood,Iran [2]Department of Control and Modeling of Mineral Processing Systems,Institute of Mineral Processing,ACECR at Tarbiat Modares,Tehran,Iran

出　　处：《Chinese Journal of Chemical Engineering》2020年第3期743-748,共6页中国化学工程学报（英文版）

基　　金：the AbbasAbad copper mine;Shahrood University of Technology for their financial support during this research。

摘　　要：Mechanochemical sulfidization of a mixed sulfide/oxide copper ore by co-grinding with sulfur and additives including Mg(NO3)2 and Fe(NO3)3 salts and iron,aluminum and magnesium powders was investigated for the first time.Also,the influence of sulfidization during the wet-milling process was examined on the separation efficiency and recovery of copper in detail.The results demonstrated that co-grinding with sulfur solely had the best flotation performance at the value of 0.5 wt.%and it was attributed to the possible existence of S\\O bonding on copper oxides surfaces.In addition,adding magnesium nitrate salt,magnesium powder,iron nitrate salt and aluminum powder as additive associated with 0.5 wt%sulfur into ball milling caused the flotation improvement at the amounts of 0.2 wt%,0.2 wt%,0.5 wt%and 0.5 wt%,respectively.Also,the effect of grinding time and sulfidization pH with 0.5 wt%sulfur solely was determined and pH s of 7.5 to 8.5 gave the best results.The highest recovery(75.76%)and separation efficiency(63.44%)were achieved at pH of 7.5 and 8.5,respectively.

关 键 词：Sulphide/oxide copper ore FLOATABILITY Mechanochemical sulfidization Reductive additives Recovery 

分 类 号：TD923[矿业工程—选矿] TD952