中文摘要：

采用氰化浸出工艺从预处理后的难处理金精矿中提取金、银。最佳氰化浸出条件为：液固比4：1，保护碱Na2CO3调节pH值9．5～10．5，氰化钠质量分数0．4％，氰化浸出96h。在此条件下，金、银浸出率分别达到96．53％、75．37％。同时，探索了复合保护碱对金、银浸出率的影响，使用复合保护碱m（Na2CO3）：m（NaOH）=3：1，金、银的浸出率分别达97．36％、75．59％，比采用单一保护碱Na2CO3时分别提高0．83％和0．22％。

英文摘要：

Gold and silver were extracted from the pretreated refractory gold concentrate by cyanide process. Un- der the optimum cyanidate conditions which are the concentration of sodium cyanide of 4 % ,the liquid to solid ratio of 4： 1, and the adjusted pH with Na2 CO3 of 9.5 - 10.5 and the leaching time of 96 h, leaching rate of gold and silver re- spectively reaches 96.53 % and 75.37 %. The effect of complex protective alkali on the leaching rate of gold and sil- ver was investigated. The influence of complex protection with alkali m（ Na2CO3 ）： m（NaOH） = 3：1 on the leaching rate is explored. The results show that leaching rate of gold and silver respectively were 97.36 % and 75.59 %, which is 0.83 % and 0.22 % higher than using Na2CO3 as single protective alkali.