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Study on recovery of gold and silver from aqua regia gold extract residue by ammonium hydroxide

Lu Jianfeng;Zijin Mining Group Co.,Ltd.;  
Left in the residue and wrapped by silver chloride,a small amount of gold may not be dissolved during gold dissolution by aqua regia.In order to better recover valuable metal and improve resource utilization rate,the paper carried out experimental research on ammonium hydroxide leaching silver chloride,glucose reducing silver and aqua regia dissolving gold.The results show that Ag leaching rate can reach 72.5 % when 450 mL ammonium hydroxide is added to 100 g dried aqua regia gold extract residue,reacting for 45 min with the solid-liquid ratio of 6;the ammonium hydroxide leaching residue will then be dissolved by aqua regia to extract gold and the gold leaching rate is about 77.29 %;total silver recovery rate is 71.05 %.The index is satisfactory.
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