C - Chemistry – Metallurgy – 25 – C
Patent
C - Chemistry, Metallurgy
25
C
204/47
C25C 3/34 (2006.01)
Patent
CA 1071569
ABSTRACT OF THE DISCLOSURE A process for the treatment of complex lead sulfide- containing concentrates additionally containing at least one metal of the group consisting of iron, copper, zinc, silver, arsenic, antimony, bismuth and gold which comprises the steps of selectively leaching a concentrate with iron-containing lixiviant for converting lead sulfide in said concentrate to lead chloride and forming a leach residue and a leach solution, subjecting said lead chloride in the leach residue to a two-stage, countercurrent, hot brine leach to dissolve the lead chloride in a brine-leach solution, subjecting the brine-leach solution to crystallization by evaporative cooling for the separate recovery of crystallized lead chloride, residual brine and crystallization condensate, and returning said residual brine to said brine leach, subjecting crystallized lead chloride in admixture with sodium chloride to electrolysis in a fused bath for production of lead and evolution of chlorine, absorbing chlorine in a first portion of said leach solution for the generation of ferric chloride- containing solution; and treating a second portion of said leach solution for the recovery of values. The iron-containing lixiviant comprises an aqueous solution of ferric chloride in a concentration in the range of from 100 to 200 g/l ferric ion or aqueous solutions of ferrous chloride and hydrochloric acid in concentrations in the range of 25 to 160 g/l ferrous chloride and of 60 to 120 g/l hydrochloric acid.
272688
Milner Edward F. G.
Parker Ernest G.
Swinkels Godefridus M.
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