Discussion recovery method of silver from silver-containing waste solution in gold-silver analysis laboratory
LIU Yong-yu, LIU Hai-bo, LIU Ben-fa
State Key Laboratory of Comprehensive Utilization of Low-grade Refractory Gold Ores,Xiamen Zijin Mining and Metallurgy Technology Co.,Ltd.,Xiamen 361011,China
Abstract：A lot of silver-containing waste solution was produced during experiments in gold-silver analysis laboratory. The silver in waste solution was precipitated using sodium chloride. The obtained silver chloride precipitate residue was mixed with reducing reagent (iron powder), fusion reagent (sodium carbonate), flux (glass powder) and sodium borate according to a certain proportion. The silver ingot was obtained after high temperature melting in muffle furnace. The recovery method of silver from waste solution was established. Various reducing reagents including iron powder, starch,wheat flour and carbon powder were compared. The results indicated that the reducing effect of iron powder was best. The dosage of reducing reagent, fusion reagent and flux as well as melting time was also discussed. It was found that the recovery of silver ingot was good under following conditions: 60 g of sodium carbonate, 15 g of iron powder, 10 g of sodium borate and 60 g of glass powder were added into 30 g of silver chloride precipitate slag; then, it was melted in muffle furnace at 1 100 ℃ for 20 min. The silver ingot could be obtained according to the experimental method. The recovery of silver could be up to 99.73% and the purity of silver ingot was 99.35%.
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