Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Iron group metal
Patent
1987-04-22
1988-07-12
Doll, John
Chemistry of inorganic compounds
Treating mixture to obtain metal containing compound
Iron group metal
75 24, 75109, C22B 1300, C22B 1512
Patent
active
047568895
ABSTRACT:
A process for recovering solder alloys and metallic salts from ZnCl.sub.2 -containing dross/flux salt feedstock by (1) heating a quantity of the feedstock to melt the salts and to separate and/or to draw off free metal, (2) infusing and concomitantly heating an aqueous solvent with the hot salt fraction to dissolve the contained salts, (3) differentially precipitating any lead salts present by controlled initial cooling, (4) removing copper and remaining residual lead by ion transfer with zinc metal anodes, (5) stripping the solution of iron by chemical oxidation and precipitation of Fe(OH).sub.3, and (6) condensing the remaining zinc chloride solution (which may retain sodium and/or potassium salts therein). The presence of the waste flux salts enhances feedstock melting as a whole and, if desired, a drum or container containing the mixed feedstocks may itself be charged in entirety to the heating chamber or vessel. The drum, which does not melt, may then be retrieved for reuse. The technique is particularly well suited for use in the reclamation of ZnCl.sub.2 from dross/flux salt feedstocks.
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Doll John
Ellwood Chemical Processing, Inc.
Langel Wayne A.
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