C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
53/373, 204/66
C22B 3/00 (2006.01) C22B 1/10 (2006.01) C22B 3/08 (2006.01) C22B 3/22 (2006.01) C22B 15/00 (2006.01) C25C 1/16 (2006.01)
Patent
CA 1121605
ABSTRACT OF THE DISCLOSURE The specification discloses a method for recovering non-ferrous metals such as zinc or copper from their concen- trates, ores or any other metal containing materials into solution containing these non-ferrous metals as sulphates and a minimal amount of dissolved iron. The resultant solution is suited without or with minimum pre-purification treatment for conventional electrowinning processes to recover such non- ferrous metals with less difficulties than the previous methods involving complex iron-removal processing. There is disclosed a method for recovering at least one non-ferrous metal soluble in sulphuric acid from a strong sulphuric acid solu- tion containing said metal and iron as sulphates, said method comprising the following consecutive steps: subjecting said solution in a sub-divided form to thermal decomposition in a fluidized bed reactor at a tem- perature of from 600 to 750°C with 20-150% excess air for an average retention time of 1-12 hours to obtain calcine containing ferric oxide and the sulphate of said non-ferrous metal; leaching said non-ferrous metal sulphate out from said calcine with water or dilute sulphuric acid solutions; separating said leach solution containing said non- ferrous metal sulphate from the residue; and recovering said non-ferrous metal from said leach solution, via electrolysis or any other method.
302719
Boorman Roy S.
Salter Robert S.
Wilkomirsky Igor A.e.
Gowling Lafleur Henderson Llp
Provincial Holdings Ltd.
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