Recovery of zinc from galvanized coatings

Details Recovery of zinc from galvanized coatings Recovery of zinc from galvanized coatings

C - Chemistry, Metallurgy

22

B

C22B 3/30 (2006.01) C22B 7/00 (2006.01) C22B 7/02 (2006.01) C22B 19/30 (2006.01) C25D 3/22 (2006.01) C25D 21/18 (2006.01)

Patent

CA 2347552

A method for extraction of zinc values from an aqueous alkaline solution of zinc, especially a solution obtained by the stripping of a galvanized coating from a ferrous metal product e.g. steel, or from electric arc furnace dust. The method comprises subjecting the aqueous alkaline solution to solvent extraction using an organic solution of an oxine i.e. an organic extractant containing an 8-hydroxyquinoline group, and separating the organic solution from aqueous alkaline solution. Zinc values are recovered from the organic solution e.g. by stripping with acid and subjecting the resultant aqueous solution containing zinc values for recovery of zinc e.g. to electrowinning or to precipitation of zinc carbonate. The method may be used in the preparation of galvanized steel for recycle to a steel manufacturing plant, with recovery of zinc and for recovery of zinc values from electric arc furnace dust.

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