China Nonferrous Metallurgy

The electrowinning experiment of silver electrolytic waste liquor was carried out by using cyclone electrowinning equipment，the electrowinning conditions of two kinds of typical silver ion concentration waste liquid A (silver ion concentration 15.42g/L) and B (silver ion concentration 47.42g/L) were studied. The results showed that the silver powder of IC-Ag 99.99 standard could be produced by using 500A/m² for 40min and 250A/m² for 20min in waste liquid A，the direct yield of qualified silver powder reached 79.2%; the silver powder of IC-Ag 99.99 standard could be produced by using 750A/m2 for 90min, 500A/m² for 40min and 250A/m² for 40min in waste liquid B，the direct yield of qualified silver powder reached 72.7%，the impurity copper and palladium in the process of electrowinning of silver electrolytic waste liquor began to precipitate largely with the decrease of silver; with the electrowinning process copper, palladium and other silver electrolyte needed to be purified impurities continue to produce，the aim of impurity removal of electrolyte was realized，the electrowinning liquid could return to the silver electrolysis system to continue to use，the zero discharge of waste liquid in silver electrolysis process was realized simultaneously，the method overcame the problem that nitrate was difficult to be treated in silver electrolysis waste liquor.