ISSN: 1003-6326
CN: 43-1239/TG

Vol. 27    No. 6    June 2017

Selective extraction Re by N235 in eluent of flue gas
WANG Hai-dong, WANG Song-rong, GAN Min, FAN Xiao-hui, DENG Qiong, GUO Hui
(School of Minerals Processing & Bioengineering, Central South University, Changsha 410083, China)
Abstract: The separation and extraction of Re and Mo using N235 from the enrichment of the eluent of the roasted molybdenum concentrate flue gas were investigated. The results show that the concentration of H+, types of acid radical ions and compositions of organic phase could have an significant effect on their extraction rate and separation coefficient of Mo and Re. The separation coefficient between Re and Mo and extraction rate of Re reach the peak value with the concentration of sulphuric acid 2.5 mol/L and the organic phase compositions 3% N235+30% octanol+67% kerosene. The optimal process conditions of N235 extraction process is as following: the ratio of O/A is 1:4 and keep extracted for 2 min at room temperature. Under the optimal conditions, the extraction rate of Re of single stage can reach 90.64%, while the extraction rate of Mo is only 10.20%. Moreover, using multi-stage countercurrent extraction, the extraction rate of Re is enhanced to 99.41% without obvious effect on the extraction rate of Mo which is only 11.49%. On this basis, ammonium perrhenate of purity more than 99% can be prepared using ammonia as stripping agent, and the comprehensive recovery rate of Re reaches 96.04% during the extraction process.
Key words: N235; extractive; separation; rhenium; molybdenum
Superintended by The China Association for Science and Technology (CAST)
Sponsored by The Nonferrous Metals Society of China (NFSOC)
Managed by Central South University (CSU)