C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
53/329
C22B 19/30 (2006.01) C22B 19/22 (1985.01)
Patent
CA 1216757
ABSTRACT The invention relates to a process for recovery of zinc ammonium fluoride, zinc chloride, zinc sulfate and zinc nitrate from solid raw materials containing zinc and iron. The process of the invention comprises the steps of (a) leaching a solid raw material containing zinc and iron in contact with a first organic solvent which comprises one or more compounds selected from the group consisting of car- boxylic acids together with a petroleum hydrocarbon as a diluent for the organic solvent; (b) recovering the first organic solvent adhering in the leached residue discharged from step (a) by dissolution with an aqueous solution con- taining one or more acids selected from the group consisting of HCl, H2SO4 an HNO3; (c) selectively extracting Fe ions from the resultant aqueous solution containing mainly iron and zinc ions from step (b) by contact with a second organic solvent; (d) regenerating the first organic solvent con- taining zinc from step (a) by contacting it with an aqueous solution containing an acid selected from the group con- sisting of HCl, H2SO4, and HNO3 in addition to NH4+ and F- ions; and (e) recovering the corresponding zinc ammonium fluoride, zinc chloride, zinc sulfate or zinc nitrate from the aqueous solution.
492112
Nishimura Sanji
Watanabe Morio
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
Solex Research Corporation Of Japan
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