Abstract
Niihama Copper Refinery of Sumitomo Metal Mining Co., Ltd. has been producing mainly electrolytic copper and precious metals since 1919.The production of gold has been quadrupled during the latest decade because of increasing copper concentrate smelting at Toyo smelter and starting treatment of high gold ores. The ores come from Sumitomo's Hishikari Gold Mines and contain about 80 grams gold per ton.Copper anode slimes produced from Niihama Refinery and Toyo Refinery are decopperized with sulphuric acid, deselenized by roasting and smelted by use of an electric furnace to concentrate precious elements. Lead refinery slimes produced at Harima ISP Refining Works are also charged to the furnace.The bunions from the electric furnace are treated and refined in a cupel after antimony and lead removal. The resulted crude silver is casted into silver anodes.In order to cope with increasing slime production, a new method, chloridizing furnace for lead removal has been adopted and a new cupel has been introduced.The treatment process for silver anode slimes has been improved to obtain up-grade quality of gold anodes. The productivity of gold electrolytic processes are advanced by use of the anodes.
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