Decomposition mechanism of chromite in sulfuric acid–dichromic acid solution

作     者：Qing Zhao Cheng-jun Liu Bao-kuan Li Mao-fa Jiang 

作者机构：Key Laboratory for Ecological Metallurgy of Multimetallic Ores(Ministry of Education)Northeastern UniversityShenyang 110819China School of MetallurgyNortheastern UniversityShenyang 110819China 

出 版 物：《International Journal of Minerals,Metallurgy and Materials》 (矿物冶金与材料学报（英文版）)

年 卷 期：2017年第24卷第12期

页      面：1361-1369页

核心收录：

学科分类：080602[工学-钢铁冶金] 0709[理学-地质学] 0819[工学-矿业工程] 0806[工学-冶金工程] 08[工学] 0708[理学-地球物理学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 0802[工学-机械工程] 0702[理学-物理学] 0801[工学-力学（可授工学、理学学位）] 

基　　金：financially supported by the National Key R&D Program of China (No.2017YFC0805100) the National Natural Science Foundation of China (Nos.51704068 and 51374059) the China Postdoctoral Science Foundation (No.2017M610184) the Postdoctoral Foundation of Northeastern University (No.20170305) 

主　　题：hydrometallurgy chromite sulfuric acid leaching spinel decomposition mechanism 

摘      要：The sulfuric acid leaching process is regarded as a promising, cleaner method to prepare trivalent chromium products from chromite; however, the decomposition mechanism of the ore is poorly understood. In this work, binary spinels of Mg–Al, Mg–Fe, and Mg–Cr in the powdered and lump states were synthesized and used as raw materials to investigate the decomposition mechanism of chromite in sulfuric acid–dichromic acid solution. The leaching yields of metallic elements and the changes in morphology of the spinel were studied. The experimental results showed that the three spinels were stable in sulfuric acid solution and that dichromic acid had little influence on the decomposition behavior of the Mg–Al spinel and Mg–Fe spinel because Mg^(2+), Al^(3+), and Fe^(3+) in spinels cannot be oxidized by Cr^(6+). However, in the case of the Mg–Cr spinel, dichromic acid substantially promoted the decomposition efficiency and functioned as a catalyst. The decomposition mechanism of chromite in sulfuric acid–dichromic acid solution was illustrated on the basis of the findings of this study.