Kinetics of indium dissolution from marmatite with high indium content in pressure acid leaching  

作　　者：Lei Tian Yan Liu Ting-An Zhang Guo-Zhi Lv Shuang Zhou Guo-Quan Zhang 

机构地区：[1]Key Laboratory for Ecological Utilization of Multimetallic Mineral, Ministry of Education, Northeastern University,Shenyang 110819, China

出　　处：《Rare Metals》2017年第1期69-76,共8页稀有金属（英文版）

基　　金：financially supported by the National High-Tech Research and Development Program of China (No. 2012AA062303);the National Natural Science Foundation of China (Nos. U1402271, 51504059 and 51504058)

摘　　要：The kinetics of oxygen pressure acid leaching marmatite with high indium content was studied. The effects of particle size, agitation rate, temperature, HSOconcentration, and oxygen partial pressure on leaching rate of indium were investigated. The results show that when the agitation rate is above 600 r-min, its influence on indium leaching rate is insignificant. It is determined that the leaching rates increase with the increase in sulfuric acid concentration, temperature, partial oxygen pressure, and the decrease in particle size. Moreover, the results demonstrate that the process of indium leaching is controlled by interface chemical reaction, with apparent activation energy of 65.7 k J-mol. The apparent reaction orders of sulfuric acid and oxygen partial pressure are determined to be 0.749 and 1.260, respectively. The leaching reaction process follows shrinking unreacted core model. And finally, the kinetics model equation is established for indium.The kinetics of oxygen pressure acid leaching marmatite with high indium content was studied. The effects of particle size, agitation rate, temperature, H_2SO_4 concentration, and oxygen partial pressure on leaching rate of indium were investigated. The results show that when the agitation rate is above 600 r-min^(-1), its influence on indium leaching rate is insignificant. It is determined that the leaching rates increase with the increase in sulfuric acid concentration, temperature, partial oxygen pressure, and the decrease in particle size. Moreover, the results demonstrate that the process of indium leaching is controlled by interface chemical reaction, with apparent activation energy of 65.7 k J-mol^(-1). The apparent reaction orders of sulfuric acid and oxygen partial pressure are determined to be 0.749 and 1.260, respectively. The leaching reaction process follows shrinking unreacted core model. And finally, the kinetics model equation is established for indium.

关 键 词：MARMATITE INDIUM Oxygen pressure acid leaching KINETICS Activation energy Reaction order 

分 类 号：TF843.1[冶金工程—有色金属冶金]