Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Group ib metal
Patent
1976-09-10
1977-10-18
Vertiz, O. R.
Chemistry of inorganic compounds
Treating mixture to obtain metal containing compound
Group ib metal
423 34, 423 94, 423 98, 423104, 423109, 423139, 423150, 204119, C01G 304, C01G 500, C01G 2116
Patent
active
040546381
ABSTRACT:
A process for the re-utilization of the sulphate residues from the electrolytic treatment of zinc.
The residues are digested hot with concentrated HCl in the presence of CaCl.sub.2. PbCl.sub.2 crystallizes on cooling. FeCl.sub.3 is extracted with TBP circulating in the direction of a series of columns and FeCl.sub.3 is extracted in a first column, washed in a second column and re-extracted a third column. The solution which issues is treated with NH.sub.3, resulting in precipitation of the majority of the hydroxides of the metals contained therein, which are subsequently separated, while Ag, Zn and Cu are complexed. Ag is precipitated with (NH.sub.4).sub.2 S.NH.sub.3 is recovered by means of lime. CaCl.sub.2 is re-cycled to the start of the process and Cu and Zn are leached together with the mineral.
Application of the process to the recovery of the metals contained in the residues from the digestion of blends.
REFERENCES:
patent: 1265547 (1918-05-01), Sulman
patent: 1565703 (1925-12-01), Elmore
patent: 3493365 (1970-02-01), Pickering
patent: 3969107 (1976-07-01), Lippert
patent: 4016054 (1977-04-01), Gandon et al.
Chemical Abstracts, vol. 77, No. 51375y, (1972).
Dreulle Noel
Fould Alain
Masson Herve
Commissariat a l'Energie Atomique (C.E.A.)
Compagnie Royale Asturienne des Mines
Hearn Brian E.
Vertiz O. R.
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