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Extraction and recovery of gold from KAu(CN) 2 using cetyltrimethylammonium bromide microemulsions
Author(s) -
Zhang TianXi,
Huang BaoGui,
Zhou WeiJin,
Gao HongCheng,
Chen Jing,
Wu HaShen,
Wu JinGuang
Publication year - 2001
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/jctb.489
Subject(s) - tributyl phosphate , bromide , stripping (fiber) , chemistry , aqueous solution , microemulsion , extraction (chemistry) , halide , aqueous two phase system , inorganic chemistry , phase (matter) , nuclear chemistry , chromatography , pulmonary surfactant , organic chemistry , materials science , biochemistry , composite material
Extraction and stripping of KAu(CN) 2 from alkaline solution by a w/o microemulsion formed with cetyltrimethylammonium bromide (CTAB) using 198 Au(I) tracer has been investigated. Various parameters, such as the Au(I) concentration in aqueous phase, concentrations of halide ions, NH 4 SCN and thiodiethylene glycol in stripping solution as well as the relationship between water and Au(I) concentration in the organic phase in the extraction and stripping of Au(I) were studied. The results show that almost all of the Au(I) in the aqueous phase was extracted into the organic phase. The water content decreased significantly with an increase in Au(I) concentration in the organic phase, contrary to the results of a system with tributyl phosphate (TBP) as cosolvent. Almost all of the extracted Au(I) (∼98%) can be recovered with pure thiodiethylene glycol as the stripping agent, and ∼93% of the Au(I) is stripped with high concentrations of NH 4 SCN(>3.0 mol dm −3 ) or KI (>2.0 mol dm −3 ). © 2001 Society of Chemical Industry