Pilot Plant Studies in the Recovery of Copper from CopperLead .
Copperlead dross is a byproduct of the refining of lead bullion produced by the Imper ial Smelting Process. This dross contains some 27 percent copper, 50 percent lead, four percent zinc and one percent sulphur. An ammonium carb onate leach at atmospheric temperature and pressure removed the copper from the dross while the lead zinc and precious metals .
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