C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
53/328
C22B 19/00 (2006.01) C01B 17/06 (2006.01) C01G 49/02 (2006.01) C22B 3/06 (2006.01) C22B 11/00 (2006.01) C22B 15/00 (2006.01)
Patent
CA 1206008
ABSTRACT OF THE DISCLOSURE A process for recovering zinc from zinc con- taining sulphidic material which also contains iron to gether with lead and/or silver includes leaching the material under oxidizing conditions at a temperature in the range of from about 130 to about 170°C in aqueous sulphuric acid solution with a stoichiometric excess of sulphuric acid relative to the zinc content of the material of from about 40 to about 100% to produce an undissolved residue containing a major proportion of lead and/or silver and a leach solution containing a major proportion of the zinc and iron. The residue is separated from the leach solution and treated to recover lead and/or silver values. The leach solution is treated to recover zinc by feeding the solution to another process in which zinc- containing material is treated to recover zinc and which includes an iron-precipitation step. The other process includes roasting zinc and iron containing sulphidic material to produce a zinc oxide and zinc ferrite con- taining material, which is then leached in a weak aqueous sulphuric acid solution to dissolve zinc oxide and pro- duce a leach solution containing dissolved zinc and a zinc ferrite containing residue. The residue is separated from the leach solution. Zinc is recovered from the leach solution, and the zinc ferrite containing residue is leached in a strong aqueous sulphuric acid solution to dissolve zinc ferrite and produce a leach solution con- taining dissolved zinc and iron and a residue, with the strong aqueous sulphuric acid solution comprising at least a portion of the leach solution containing a major pro- portion of zinc and iron. The leach solution containing dissolved zinc and iron is separated from the residue. Ferric iron in the leach solution is reduced to ferrous iron, and the ferrous iron is neutralized and hydrolyzed under oxidizing conditions to precipitate at iron com- pound, and the iron compound is separated from the remaining solution.
421818
Masters Ian M.
Weir Donald R.
Gowling Lafleur Henderson Llp
Sherritt International Consultants Inc.
LandOfFree
Recovery of zinc from zinc-containing sulphidic material 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 from zinc-containing sulphidic material, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Recovery of zinc from zinc-containing sulphidic material will most certainly appreciate the feedback.
Profile ID: LFCA-PAI-O-1169683