LIX63和Versatic10萃取体系中镍钴锰的协萃机制研究  

Synergistic Extraction Mechanism of Versatic10 and LIX63 for Ni2+,Co2+,Mn2+

作　　者：吴霞 朱山 李松 WU Xia;ZHU Shan;LI Song(School of Chemistry and Materials Engineering,Liupanshui Normal University,Liupanshui 553000,China)

机构地区：[1]六盘水师范学院化学与材料工程学院

出　　处：《湿法冶金》2020年第1期34-40,共7页Hydrometallurgy of China

基　　金：贵州省科技厅基础研究计划项目(黔科合基础[2019]1292号);六盘水师范学院高层次人才科研启动基金资助项目(LPSSYKYJJ201809);六盘水师范学院重点培育学科项目(LPSSYZDPYXK201708)

摘　　要：采用斜率法研究了Versatic10(HA1)、LIX63(HA2)及二者协同萃取体系对Ni2+、Co2+、Mn2+的萃取机制,考察了LIX63和Versatic10协同萃取Ni2+、Co2+、Mn2+时分配比随温度的变化,并计算相关热力学参数。结果表明:LIX63与Versatic10的物质的量比在1/4~4/1范围内,该协萃体系对Ni2+、Co2+有明显的协萃效应,其中对Ni2+的协萃效果更好,对Mn2+基本没有协萃效应;Versatic10萃取Co2+、Ni2+、Mn2+时形成的萃合物可能为Co(A1)2、Ni(A1)2、Mn(A1)2;LIX63萃取Ni2+、Co2+、Mn2+形成的萃合物可能为[Ni(A2)2]、[Co(HA2)SO4]和[Mn(HA2)SO4];LIX63和Versatic10协同萃取Ni2+、Co2+、Mn2+时形成的萃合物可能为Ni(A1)2(HA2)2、Co(A1)2(HA2)2、Mn(A1)2(HA2)2;协同萃取Ni2+时吸热,协同萃取Co2+、Mn2+时放热;协同萃取Ni2+的反应过程中增熵,协同萃取Co2+、Mn2+的反应熵小于零,表明萃取过程中水相金属离子脱水过程引起的熵变大于形成萃合物过程中所引起的熵变。The extraction Mechanism for Ni2+,Co2+,Mn2+of Versatic10(HA1),LIX63(HA2)and the mixture of Versatic10(HA1)and LIX63(HA2)were investigated by slope method,the effects of temperature on the synergistic extraction distribution ratio of Co2+,Ni2+and Mn2+of Versatic10(HA1)and LIX63(HA2)were studied.The results show that the synergistic system affects extraction of Co2+,Ni2+while nearly no affecting for Mn2+.Ni2+,Co2+and Mn2+are extracted as[CoA2],[NiA2]and[MnA2]by Versatic10 alone,and as[Co(HA2)SO4],[NiA2]and[Mn(HA2)SO4]by LIX63 alone,while as[CoA1(HA2)2],[NiA1(HA2)2],[MnA1(HA2)2]by the mixtures of LIX63 and Versatic10,respectively.The extraction of Ni2+is endothermic and extraction of Co2+and Mn2+are exothermic.Entropy increases in the synergistic extraction of Ni2+,while decrease below zero in synergistic extraction of Co2+and Mn2+.The results indicate that the entropy change caused by dehydration of metal ions in aqueous phase is greater than that caused by forming of extracting compounds.

关 键 词：LIX63 Versatic10 协同萃取 钴 镍 锰 

分 类 号：TF804.2[冶金工程—有色金属冶金]