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某金矿石金矿物粒度细小且大部分以次显微金的形式存在,属于高砷硫化矿难选金矿石。由于浮选金精矿含砷,常规氰化浸出率仅为11.84%。经细菌氧化—氰化提金连续扩大试验研究,磨矿细度-0.071 mm占96%,矿浆浓度20%,矿浆温度45℃,矿浆pH值1.5～1.8,细菌氧化采用二级氧化,氧化时间9 d,金浸出率达到93.24%,比常规氰化浸出率提高了81.40%,各项指标大幅提高,解决了销售难题,达产后年利润提高了5 000万元,为含砷硫化矿难选金矿石的开发利用提供了选冶新工艺。
A small gold mineral grain size and the majority of sub-micro-gold in the form of gold, belonging to arsenic sulfide refractory gold ore. As a result of flotation gold concentrate containing arsenic, the conventional cyanidation leaching rate was only 11.84%. Bacterial oxidation - cyanidation gold continuous expansion of experimental study, grinding fineness -0.071 mm accounted for 96%, pulp concentration 20%, pulp temperature 45 ℃, pulp pH 1.5 to 1.8, the bacterial oxidation secondary oxidation, oxidation time 9 d, the leaching rate of gold reached 93.24%, which was 81.40% higher than the conventional leaching rate of cyanidation. The indexes increased sharply and the sales problem was solved. The annual profit increased by 50 million yuan after the project was put into production, The development and utilization of ore provided a new process of smelting and smelting.