新型萃取剂YORS萃取Zn(Ⅱ)-NH3配合物体系中的锌

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pH9～11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 rnin, 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.