C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
53/324, 53/340
C22B 19/02 (2006.01) B03B 5/28 (2006.01) B03D 1/02 (2006.01) C22B 3/00 (2006.01) C22B 13/00 (2006.01) C22B 13/08 (2006.01) C22C 3/00 (2006.01)
Patent
CA 1072342
Abstract of the Invention Lead is recovered from lead sulfide concentrates or mixed lead-zinc concentrates containing iron sulfide by form- ing a slurry of such concentrates in an aqueous medium containing ammonium sulfate and free ammonia, and introducing such slurry into a closed reaction vessel at a pressure not exceeding 30 psig. Oxygen also is introduced into such vessel to establish therein a partial oxygen pressure of at least a few psi, while vigor- ously agitating the slurry. The lead sulfide content of the con- centrates thereby is converted to the form of substantially water-insoluable oxidic lead compounds, while any zinc sulfide present is dissolved. The slurry then is withdrawn from the reac- tion vessel and the insoluble residue is separated from the aque- ous solution. The letter is treated for recovery of its zinc and ammonia content, and the residue is subjected to a froth flotation operation to form a concentrate containing substanti- ally all the iron sulfide and a tailing containing the oxidic lead compounds. Lead is recovered from such tailing.
246331
Arbiter Nathaniel
Kuhn Martin C.
Na
The Anaconda Company
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