93.
(11) Patent number: 2150522
(46) Date of publication: 10.06.2000
(51) Int. Cl.7: C 22 B 11/00, 3/38
(21) Application number: 98122108/02
(22) Application date: 09.12.1998
(71) Applicant:
Institut neorganicheskoj khimii SO RAN
(72) Inventor:
Mironov I.V.,
Tsvelodub L.D.,
Chanysheva T.A.
(73) Proprietor:
Institut neorganicheskoj khimii SO RAN
(98) Mail address:
630090, g.Novosibirsk, pr.Ak.Lavrent'eva 3, Institut neorganicheskoj khimii SO RA
(54) METHOD OF PREPARING HIGH-PURITY GOLD FROM CRUDE METAL
(57)
FIELD: precious metal technology. SUBSTANCE: to prepare high-purity gold of 99.99%, gold extraction and reextraction processes are simultaneously conducted in extraction membrane: aqueous phase 1 (initial solution) organic phase (tributyl phosphate solution) - aqueous phase 2 (mineral acid solution). According to invention, aqueous phase 2 is kept at 30 to 70 C. Gold is concentrated in aqueous phase 2. Subsequent isolation of metal is accomplished involving known techniques. EFFECT: simplified procedure and allowed concentration of gold in reextraction stage. 2 cl, 1 tbl, 2 ex
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