(中南大學(xué) 資源加工與生物工程學(xué)院，長(zhǎng)沙 410083)
摘 要: 利用N235萃取劑，開展含錸鉬精礦焙燒煙氣淋洗液中錸和鉬分離、提取的研究。結(jié)果表明：H+濃度、酸根離子種類和有機(jī)相組成都會(huì)對(duì)鉬和錸的萃取率及其分離系數(shù)產(chǎn)生較大影響。在硫酸濃度為2.5 moL/L、有機(jī)相組成為3% N235+30%仲辛醇+67%煤油(體積分?jǐn)?shù))條件下，錸的萃取率高、鉬錸分離系數(shù)大。N235萃取的最優(yōu)工藝條件為：相比O/A為1:4、萃取平衡時(shí)間為2 min、萃取溫度為常溫。單級(jí)逆流萃取錸的萃取率為90.64%，鉬的萃取率為10.20%。采用二次三級(jí)逆流萃取，錸的總萃取率高達(dá)99.41%，而鉬的總萃取率僅為11.49%。在此基礎(chǔ)上，以氨水為反萃劑，經(jīng)過濃縮結(jié)晶可制得純度大于99%的高錸酸銨，整個(gè)萃取反萃工藝流程錸的綜合回收率達(dá)到96.04%，實(shí)現(xiàn)錸的高效提取。
關(guān)鍵字: N235；萃取；分離；錸；鉬
（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
