Separation of rhenium from electric-oxidation leaching solution of molybdenite

CAO Zhan-fang(曹占芳)^{1, 2, 3}, ZHONG Hong(钟宏)^{1, 2}, JIANG Tao(姜涛)³, LIU Guang-yi(刘广义)^{1, 2}, WANG Shuai(王帅)^{1, 2}, XIA Liu-yin(夏柳荫)^{1, 2}

(1. College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China;
2. Key Laboratory of Resources Chemistry of Nonferrous Metals of Ministry of Education (Central South University), Changsha 410083, China;
3. School of Minerals Processing & Bioengineering, Central South University, Changsha 410083, China)

Abstract:The separation of rhenium from molybdenum in aqueous solution has always been a problem in hydrometallurgy. The separation of rhenium from the electro-oxidation leachate of molybdenite and its mechanism were investigated. The results show that pH of the leachate significantly affects adsorption rate compared with other experimental parameters. When temperature is 30 °C, pH=8, and adsorbing time is 1 h, adsorption rates of rhenium and molybdenum are 93.46% and 3.57%, respectively, and separation factor of D301 resin for rhenium and molybdenum is 169.56. In addition, the separation factor is higher when the initial molybdenum concentration in model solution is increased. The saturated adsorption capacity of D301 resin for molybdenum and rhenium calculated based on simulated results are 4.263 3 mmol/g and 4.235 5 mmol/g, respectively. D301 resin is an effective separation material of rhenium from electric-oxidation leachate of molybdenite. The adsorption kinetics results also show that the adsorption of rhenium is easier than that of molybdenum, and the adsorption process of D301 for rhenium and molybdenum may be controlled by liquid film diffusion.

Key words:rhenium; molybdenum; separation; resin; molybdenite