Studies on the Extraction of Gold (Ⅰ) Cyanide by Quaternary Ammonium Salt Using 198Au as  Tracer

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Studies on the Extraction of Gold (Ⅰ) Cyanide by Quaternary Ammonium Salt Using 198Au as
Tracer

ZHANG Tianxi^a; ZHOU Weijin^a; GAO Hongcheng^a; CHEN Jing^b; WU Jinguang^a

^a State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of
Chemistry and Molecular Engineering, Peking University, Beijing 100871
^b Institute of Precious Metals, Kunming 650221

Received:1900-01-01 Revised:1900-01-01 Online:2002-02-28 Published:2002-02-28
Contact: ZHANG Tianxi

用198Au示踪法研究季铵盐体系萃取金

张天喜^a; 周维金^a; 高宏成^a; 陈景^b; 吴瑾光^a

^a State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of
Chemistry and Molecular Engineering, Peking University, Beijing 100871
^b Institute of Precious Metals, Kunming 650221

通讯作者: 张天喜

Abstract

Abstract: 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).

Key words: solvent extraction, gold (Ⅰ) cyanide, 198Au tracer, trialkylmethylammonium chloride, cetyltrimethy lammonium bromide

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).

关键词: solvent extraction;gold (Ⅰ) cyanide;198Au tracer;trialkylmethylammonium chloride; cetyltrimethy lammonium bromide

ZHANG Tianxi, ZHOU Weijin, GAO Hongcheng, CHEN Jing, WU Jinguang. Studies on the Extraction of Gold (Ⅰ) Cyanide by Quaternary Ammonium Salt Using 198Au as
Tracer[J]. .

张天喜, 周维金, 高宏成, 陈景, 吴瑾光. 用198Au示踪法研究季铵盐体系萃取金[J]. CIESC Journal.

References

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cyanide solution", Peking University, Beijing (2000). (in Chinese)
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