缅甸某金矿重选-浸出选矿试验研究

Experimental Study on a Gold Ore with Gravity Separation-cyanidation for Gravity Tailings Process

鉴于缅甸某金矿性质及当地矿山实际情况,开展了尼尔森重选-尾矿氰化浸出试验条件研究。结果表明,当采用三段不同磨矿细度,三段尼尔森GRG重选流程,可得到金品位为292.91 g/t、回收率为59.86%的重砂精矿,以及金品位为6.45 g/t、回收率为40.14%重选尾矿,同时也节约了磨矿成本。重选尾矿氰化浸出较佳条件为磨矿细度-0.045 mm 78%、矿浆浓度40%、石灰用量1.5 kg/t、氰化钠用量4.0 kg/t、浸出20 h,金作业回收率为93.18%。采用尼尔森重选-尾矿氰化浸出联合流程,金的总回收率可达到97.26%。

According to the characteristics of a gold ore in Myanmar and the actual requirements of the local mimines,the conditions for the Knelson gravity separation-cyanidationfor gravity tailings process were carried out,and theresults show that after three-stages of different grinding and three-stage GRG process,gravity concentrate sand gravity tailings can be obtained,and the gold grade is 6.45 g/t,and the grades and recovery rates are 292.91 g/t,6.45 g/t,59.86%and 40.14%respectively.The best conditions for cyanidation for gravity tailings are grinding fineness-0.045mm,78%,pulp concentration 40%,lime dosage 1.5kg/t,sodium cyanide dosage 4.0 kg/t,leaching time 20 hours,the gold operating rate is 95.15%.The Gold total recovery rate of the whole joint process could reach 97.26%.