Zinc extraction from zinc oxidized ore using(NH4)2SO4 roasting−leaching process  

作　　者：Xiao-yi Shen Hong-mei Shao Ji-wen Ding Yan Liu Hui-min Gu Yu-chun Zhai 

机构地区：[1]Key Laboratory for Ecological Utilization of Multimetallic Mineral of Ministry of Education,School of Metallurgy,Northeastern University,Shenyang 110819,China [2]School of Environmental and Chemical Engineering,Shenyang Ligong University,Shenyang 110159,China [3]School of Computer Science and Engineering,Northeastern University,Shenyang 110819,China

出　　处：《International Journal of Minerals,Metallurgy and Materials》2020年第11期1471-1481,共11页矿物冶金与材料学报（英文版）

基　　金：This work was financially supported by the National Natural Science Foundation of China(Nos.51774070,52004165,and 51574084);and the National Key Research and Development Program of China(No.2017YFB 0305401).

摘　　要：An improved method of(NH4)2SO4 roasting followed by water leaching to utilize zinc oxidized ores was studied.The operating parameters were obtained by investigating the effects of the molar ratio of(NH4)2SO4 to zinc,roasting temperature,and holding time on zinc extraction.The roasting process followed the chemical reaction control mechanism with the apparent activation energy value of 41.74 kJ·mol^−1.The transformation of mineral phases in roasting was identified by X-ray diffraction analysis combined with thermogravimetry–differential thermal analysis curves.The water leaching conditions,including the leaching temperature,leaching time,stirring velocity,and liquid-to-solid ratio,were discussed,and the leaching kinetics was studied.The reaction rate was obtained under outer diffusion without product layer control;the values of the apparent activation energy for two stages were 4.12 and 8.19 kJ·mol^−1.The maximum zinc extraction ratio reached 96%while the efficiency of iron extraction was approximately 32%under appropriate conditions.This work offers an effective method for the comprehensive use of zinc oxidized ores.

关 键 词：zinc oxidized ore ammonium sulfate roasting water leaching KINETICS MECHANISM extraction ratio 

分 类 号：TF813[冶金工程—有色金属冶金]