反相萃取柱色层分离金及应用

Separation of Gold by Reversed-Phase Chromatography

金的湿法分离富集常用的共沉淀法、吸附法、离子交换法等,操作均较繁琐。反相萃取柱色层法具有简单、快速,且分离效率高,使用有机溶剂少等优点。本文设计了金（Ⅲ）的反相萃取柱色层分离法:以701（聚四氟乙烯）为支持体,磷酸三丁酯（TBP）-乙醚为固定相,以王水稀释至20％为柱平衡液。金（Ⅲ）能被定量萃取。以10％HCl作杂质淋洗液,1％Na2SO3溶液作金的解脱液,可使Au3+与Ag+、Hg2+、W（Ⅵ）Cu2+、Mo（Ⅵ）、V（v）、Zn2+、Fe3+、In3+、Ga3+、Pb2+、Ag（v）、Cd2+、Mn2+、Sb5+、Pt2+、Pd2+等离子定量分离,金的回收率可达100％（SDBS-TMK光度法测定）。该法不仅分离效率高,选择性好,而且简便、快速、准确。

PTFE is used as supporter in the separation. Au (III) is collected on the fixed phase of TBP-ether equilibrated with 20% aqua regia. The impurities (Ag+, Hg2+,Cd2+,etc.) are removed with 10%HCl.Au (III) is released with 1%Na2SO3 and determined by SDBS-TMK micellar solubilized spectrophotometry. The method is applicable to ores containing Au in excess of 1 g/t. It is simple and selective. A higher separation efficiency and a complete recovery can be obtained.