Electric-oxidation extraction of molybdenite concentrate in alkaline NaCl electrolyte  

作　　者：曹占芳 钟宏 刘广义 符剑刚 闻振乾 王帅 

机构地区：[1]School of Chemistry and Chemical Engineering, Central South University

出　　处：《Journal of Central South University》2010年第3期480-484,共5页中南大学学报（英文版）

基　　金：Project(2007BAB22B01) supported by the 11th Five-Year Plan of National Science and Technology of China; Project(50704036) supported by the National Natural Science Foundation of China

摘　　要：The dissolution of molybdenite concentrate in NaC1 electrolyte was investigated. The results show that the dissolution rate increases with the increase in liquid-to-solid ratio, stirring speed, NaCl concentration and temperature. When the liquid-to-solid ratio is 30：1, stirring speed is 400 r/min, concentration of NaCI is 4 mol/L at pH=9 and room temperature, the leaching efficiency of molybdenite concentrate will reach 99.5% in 240 min. Molybdenite concentrate cannot be electro-oxidized directly on the anode. The kinetic studies show that the dissolution of molybdenite concentrate is represented by shrinking core model with diffusion through a porous product layer of element sulfur, and the apparent activation energy for the dissolution reaction is 8.56 kJ/mol.The dissolution of molybdenite concentrate in NaCl electrolyte was investigated. The results show that the dissolution rate increases with the increase in liquid-to-solid ratio, stirring speed, NaCl concentration and temperature. When the liquid-to-solid ratio is 30:1, stirring speed is 400 r/min, concentration of NaCl is 4 mol/L at pH=9 and room temperature, the leaching efficiency of molybdenite concentrate will reach 99.5% in 240 min. Molybdenite concentrate cannot be electro-oxidized directly on the anode. The kinetic studies show that the dissolution of molybdenite concentrate is represented by shrinking core model with diffusion through a porous product layer of element sulfur, and the apparent activation energy for the dissolution reaction is 8.56 kJ/mol.

关 键 词：wet leaching MOLYBDENITE electric-oxidation kinetics DISSOLUTION 

分 类 号：TF111[冶金工程—冶金物理化学]