Abstract: Processes for the removal of arsenic from aqueous solutions such as contaminated waters and process solutions are disclosed. Arsenic is removed from process solutions/effluents either by precipitation with a soluble iron compound, or solvent extraction and subsequent treatment with engineered materials, such as granular iron oxide. Arsenic may also be directly removed from arsenic contaminated ground and/or surface waters using engineered materials, especially by contacting ground and/or surface waters with silica, granular iron oxide and optionally natural zeolite in sequence. The treated solutions/effluents and waters may be released into the environment.

Abstract: 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.