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AMMONIA LEACH PROCESSES
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acid leach acid solution agent alloy aluminum ammonia ammonium amount aqua regia aqueous phase aqueous solution assigned chalcopyrite cobalt compounds comprises concentrate converter cooled copper extraction copper sulfate cupric cuprous describe a process dioxide dissolved electrolyte electrowinning Example extraction feed ferric chloride ferrous filtered filtrate grams per liter halide heated hydrochloric acid hydrogen hydrogen peroxide hydroxide impurities iridium iron leach solution liquid liquor magnesium manganese material matte melt metal values mineral mixed mixture molten molybdenite molybdenum nickel nitric acid nodules obtained operation organic phase oxide oxygen particles percent precipitate preferably pressure process described produced ratio reactor recovered recovery recycled reduced removed residue rhenium roasting ruthenium salt sample separated silver slag slurry smelting furnace sodium solids solu soluble solution containing solvent stage step stripping substantially sulfide sulfur dioxide sulfuric acid temperature tion treated U.S. Patent volume washed weight zinc