N_(503)萃取盐酸介质中的金(Ⅲ)

Extraction of gold (iii)in aqua medium of hydrochloric acid with extractant N503

本文以N,N一二(1—甲庚基)乙酰胺(N503)为萃取剂,二甲苯为稀释剂的萃取有机相,在萃取盐酸介质中的金(Ⅲ)过程中,研究并解释了盐酸浓度、金(Ⅲ)起始浓度、离子强度(以LiCl维持)和萃取剂浓度等因素对分配比的影响。根据实验结果,认为萃取金(Ⅲ)过程属于(钅羊)盐萃取机理,萃取剂浓度高和低时,有机相分别形成组成为[{N503)_2·H}^+AuCl_4^-]和[(N503·H)^+AuCl_4^-]的萃合物。

The mechanism of extraction of Au(Ⅲ)with N, N-di(l-methyl-heptyl)ace-tamideCcommercial name N503)was investigated in the extraction system: HAuCl4(CM)/ HCl (0-7N)/N503-dimethylbenzene.The effects of concentration of HCl, initial concentration of Au(Ⅲ)and ionic strength (LiCl) in aqueous phase, extractant concentration in organic phase on distribution ratio were tested. The process of the extraction was considered as oxonium salt mechanism and the composition of extracted species was evaluated as[{(N503)2·H}+AuCl-4]and[(N503·H)+AuCl4-] at high and low level of extractant respectively.