Au(Ⅲ)、Ag(Ⅰ)与巯基乙酰苯胺的配合物及其在贵金属回收中的应用

THE COORDINATION COMPOUNDS OF Au(Ⅲ), Ag(Ⅰ) WITH MERCAPTOACETANIL AND THEIR APPLICATION IN RECOVERY OF PRECIOUS METALS

早期巯基乙酰苯胺(mereaptoacetaniⅠ简写MAA)曾作分析试剂使用,其Au(Ⅰ)配合物的合成及在医疗中的应用已有报道。但它的Au(Ⅲ)配合物的合成、表征,Au(Ⅰ)、Ag(Ⅰ)配合物的表征以及它们通过高温裂解法用于回收贵金属的工作尚未见报道。本文对此进行了一些试探研究。

The properties of the coordination compoands of Au(Ⅲ), Au(Ⅰ) and Ag(Ⅰ) with mercapto-acetanil (MAA or HL) are reported.The AuL_3 type of the compounds is synthesized for the first time and characterized by elemental analysis, UV, IR and TG-DTA. The ligand (MAA) selectively chelates Au(Ⅲ) from acidic solution or aqua regia containing ions such as Ca, Mg, Cd, Mn, Co, Ni, Cu, Zn and Fe. The formed AuL_3. then converts into Au(Ⅰ)L in absolute ethyl alcohol. The gold and silver were recovered through high temperature decomposition of the AuL_3 and AgL, respectively. The recovery ratio for gold is over 97%, for silver over 98%. The purity of the obtained gold is 99.89～99.98%. The cost of the method is much lower than that of using zinc pyridinethione as a chelating agent.