1490813 Extraction of copper ISC SMELTING Ltd 5 July 1976 [21 July 1975] 30485/75 Heading ClA Copper values are leached from copper dross (separated from blast furnace lead bullion) which contains 0À5-1À5 g. atoms of sulphur per g. atom of copper, by contacting particles of the dross, in the form of a matrix of metallic lead containing copper and copper compound inclusions, with an aqueous solution of ammonium sulphate and ammonium hydroxide the solution containing substantially no carbonate ions. The leaching may be performed in the presence of an oxidizing gas. The copper may be recovered from the leachate by contact with a copper-selective organic extractant.
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