难处理金银精矿生物氧化—氰化浸金试验研究

Experimental research on bacterial oxidation-cyanidation gold leaching process for refractory gold and silver concentrates

针对大兴安岭兴安金矿难处理金银精矿中存在包裹态金、银,常规氰化金、银浸出率较低的特点,进行了生物氧化—氰化浸金联合工艺试验研究。其结果表明:在温度35℃,搅拌速度450 r/min,矿石细度-0.044 mm占95%,微生物生长电位高于550 m V,充气量0.06 m^3/(L·h),矿浆浓度17.5%,氧化时间8 d的最佳条件下,金、银浸出率可从常规氰化的67.01%、45.01%分别提高至97.76%和99.42%,试验效果较好。

In view of the existence of gold and silver inclusions in one refractory gold and silver concentrates from Xing＇an Gold Mine of Greater Khingan Mountains that hinders the effectiveness of conventional cyanidation gold and silver leaching process,experimental research on a combined bacterial oxidation- cyanidation gold leaching process is carried out. The results show that the leaching rate of gold and silver can be as high as 97. 76 % and 99. 42 % respectively compared to 67. 01 % and 45. 01 % by conventional cyanidation process,when the temperature is 35 ℃,stirring speed is 450 r / min,fineness is 95 %- 0. 044 mm,growing potential is above 550 m V,aeration quantity is0. 06 m^3/（ L·h）,pulp density is 17. 5 %,and oxidation time is 8 d.