Halogenation of lead sulfide

Details Halogenation of lead sulfide Halogenation of lead sulfide

C - Chemistry, Metallurgy

01

G

23/156

C01G 21/16 (2006.01)

Patent

CA 1111228

HALOGENATION OF LEAD SULFIDE ABSTRACT Lead sources, and particularly lead sulfide concentrates, are halogenated utilizing a halogen gas in a dry atmosphere at a relatively low temperature to selectively halogenate the lead. The process is improved by effecting the halogenation in a fluidized state in a fluidized bed re- actor, the fluidized state of the lead sulfide being accomplished by intro- ducing a mixture of halogen gas and an oxygen-containing gas at a rate sufficient to maintain the lead sulfide in the desired fluidized state. Thereafter, metallic lead may be obtained by leaching the halogenated mix- ture with brine, filtering to separate elemental sulfur and residue from soluble lead halide. The soluble lead halide is then crystallized and the desired metallic lead is obtained by fused salt electrolysis.

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