A New Wet Process for Efficient Separation of Complex Polymetallic Silver Copper Concentrates
The experiment adopted the experimental process of nitric acid leaching copper,oxidation roasting desulfurization,nitric acid leaching silver,and lead-hydrazine hydrate reduction of silver.The recovery of copper from concentrate was carried out by catalytic oxidation leaching of nitrate sulfur mixed acid,and the leaching solution is then replaced to obtain sponge copper.After being oxidized,roasted,desulfurized,and converted into sodium carbonate,the copper leaching slag was leached with nitric acid to remove silver and lead.Silver and lead were then separated by silver chloride precipitation.Finally,silver powder was obtained by reduction with hydrazine hydrate,and crude lead sulfate was obtained by sulfuric acid precipitation as the raw material for pyrometallurgical lead smelting.The iron and a small amount of arsenic in the concentrate were purified and removed by the iron alum method.The experimental results show that using this process flow to treat complex polymetallic silver-copper concentrate can achieve a silver direct yield of over 90％,a copper direct yield of over 93％,and a lead direct yield of over 92％.
nitrate sulfur mixed acid leaching of coppercatalytic oxidation leachingoxidative roastingiron removal by iron alum methodreplacement of copper
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