C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
53/328
C22B 3/08 (2006.01)
Patent
CA 1097507
ABSTRACT OF THE DISCLOSURE: A process for treating a residue from the sulfuric acid leaching of roasted zinc blende, comprising (a) leaching the residue in single stage with sulfuric acid and a metal sulfide supplied in a quantity sufficient for transforming the iron into divalent iron, the temperature being maintained bet- ween about 60°C and boiling point, (b) heating the mass to a temperature above the melting point of sulfur, separating a first fine-grained residue of low zinc and iron contents and high lead content, and separating a coarse-grained residue containing sulfur, compounds of iron and any excess metal sul- fide from (a), (c) adjusting the pH of the residual solution to at most about 2, at a temperature between about 80°C and the boiling point adding zinc dust thereby to precipitate copper and separating the precipitate, (d) adjusting the pH to about 4 to 5 and separating the precipitate which forms, and (e) oxidizing the residual solution to precipitate iron as hematite, and separating the hematite from the putified zinc-containing solution. This process advantageously enables a removal of zinc from the zincenite-containing residive to a high degree and transformation of iron into a form inwhich it canbe dumped.
277485
Smykalla Gunter
von Ropenack Adolf
Wiegand Volker
Metallgesellschaft Aktiengesellschaft
Robic Robic & Associes/associates
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