C - Chemistry – Metallurgy – 25 – C
Patent
C - Chemistry, Metallurgy
25
C
204/74
C25C 1/16 (2006.01)
Patent
CA 1066658
ABSTRACT OF THE DISCLOSURE Iron-bearing zinc sulfide concentrates are leached with a sulfuric acid solution containing hexavalent chromium ions, e.g. chromic acid or a dichromate. The leach solution after separation from undissolved residue is hydrolyzed by heating under pressure at a temperature near or above the boiling point of the solution (ordinarily a range of from about 90°C to about 250°C ) to precipitate iron as a basic ferric salt. The iron precipitate is separated, the residual solution subjected to zinc dust purification, and the thus purified solution then subjected to a first bifluid electrolysis to electrowin zinc and to regenerate sulfuric acid and reoxidize trivalent chromium ions to hexavalent form. Anolyte discharged from the first electrolysis is subjected as anolyte in a second bifluid electrolysis to oxidize the remaining trivalent chromium to hexavalent form, and thereafter the solution is recycled to the leaching operation.
233115
Bilson Edward A.
Morris Thomas M.
LandOfFree
Recovery of zinc does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Recovery of zinc, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Recovery of zinc will most certainly appreciate the feedback.
Profile ID: LFCA-PAI-O-346784