张天喜a; 周维金a; 高宏成a; 陈景b; 吴瑾光a
ZHANG Tianxia; ZHOU Weijina; GAO Hongchenga; CHEN Jingb; WU Jinguanga
摘要: The solvent extraction of KAu(CN)2 from alkaline solution by quaternary ammonium salts
(trialkylmethylammonium chloride or cetyltrimethylammonium bromide) was investigated by
means of 198Au radioactive tracer method. Various parameters, such as the gold (Ⅰ)
concentration in aqueous phase, the modifier, emulsification at the interface of two
phases, and phase ratio used in the extraction of gold (Ⅰ) were studied. The results
demonstrate that almost all gold (Ⅰ) in the aqueous phase was practically extracted into
the organic phase. The water content in the organic phase decreased significantly with
increase of gold (Ⅰ) concentration using long chain alcohol as modifier, in contrast with
the system with tributyl phosphate (TBP) as modifier. Emulsification at the interface of
two phases decreases with an increase of modifier concentration in the organic phase or
with the addition of a small amount of lysozyme into the aqueous phase. The method with
198Au tracer can be directly used to determine the Au(Ⅰ) concentration both in aqueous and
organic phases, which is especially suitable for the low concentration of Au(Ⅰ).