新型萃取剂YORS萃取Zn(Ⅱ)-NH_3配合物体系中的锌  

Solvent extraction of zinc from Zn(Ⅱ)-NH_3 complex system by new extractant YORS

作　　者：何静[1] 黄玲[1] 陈永明[1] 唐谟堂[1] 金胜明[1] 冯瑞姝[1] 吴胜男[1] 

机构地区：[1]中南大学冶金科学与工程学院,长沙410083

出　　处：《中国有色金属学报》2011年第3期687-693,共7页The Chinese Journal of Nonferrous Metals

基　　金：国家"十一五"科技支撑计划资助项目(2006BA02B04-4-2);国家自然基金资助项目(50674104)

摘　　要：为有效地富集低品位氧化锌矿氨浸液中的锌离子,使用新型萃取剂2-乙酰基-3-氧代-二硫代丁酸-十四烷基酯（YORS）从Zn（Ⅱ）-NH3配合物体系中萃取锌。研究结果表明：在有机相组成50%YORS＋45%H（稀释剂）＋5%P（添加剂）、相比V（A）/V（O）=2-1、温度298.15 K、振荡时间5 min、总氨浓度2 mol/L、水相初始pH 9~11的最优条件下,锌的平均萃取率达97%以上,分配比Dex=41.74。对萃取剂和负载有机相进行红外光谱和紫外光谱分析,得到萃取剂和萃合物的分子结构,并证实在锌的萃取过程中萃取剂中的β-二酮与游离态Zn2＋作用生成配合物,NH3未被萃取。In order to enrich the zinc concentration in ammoniacal leaching solution of low grade of zinc oxide ores,2-acetyl-3-oxo-dithiobutyric acid-myristyl ester,a new extractant,named as YORS,was used to extract zinc ion from Zn（II）-NH3 solutions.The results show that the average extraction ratio of zinc is larger than 97% and the distribution ratio of zinc can reach 41.74 under the following optimum conditions： organic phase composition 50%YORS＋45%H（diluent）＋5%P（additive）,phase ratio V（A）/V（O） =2：1,temperature 298.15 K,agitation time 5 min,total ammonium concentration 2 mol/L,initial pH value 9~11.YORS extractant and loaded organic phase was characterized by FTIR and UV spectra to determine their molecular structures,respectively.It is demonstrated that the β-diketone of YORS reacts with free bivalent zinc ion to form coordination compound during zinc solvent extraction,but zinc ammine complexes are not co-extracted.

关 键 词：氧化锌矿 Zn(Ⅱ)-NH3体系 溶剂萃取 2-乙酰基-3-氧代-二硫代丁酸-十四烷基酯 

分 类 号：TF804.2[冶金工程—有色金属冶金]