新疆阿希金精矿生物预氧化过程强化

为了提高阿希金精矿的生物预氧化效率，研究了3组不同微生物菌群、两步氧化工艺对生物预氧化的强化效果. 结果表明，中度嗜热混合菌为最佳菌群，矿浆浓度提高严重影响菌群生物预氧化效果. 矿浆浓度为2%时，铁、硫脱除率为98.35%和91.90%；矿浆浓度为15%时，铁、硫脱除率下降到50.25%和49.51%. 采用两步氧化法可明显提高中度嗜热混合菌的铁、硫脱除率，降低矿浆浓度的影响. 矿浆浓度为15%时，铁、硫脱除率分别提高到64.93%和65.73%，与常规方法处理10%矿浆结果相当.

Intensification of the Bio-oxidation Process of Axi Refractory Gold Concentrate

In order to enhance the efficiency of bio-oxidation of Axi gold concentrate, the effects of three mixed bacteria cultures and two-step treatment approach on the intensification of bio-oxidation were studied. The results revealed that the optimum mixed culture was moderate thermophiles, the oxidation rates declined drastically with increasing of pulp density. The extraction rates of iron and sulfur were 98.35% and 91.90% at 2% pulp density, when the pulp density was elevated to 15%, the extraction rates of iron and sulfur declined to 50.25% and 49.51%, respectively. The two-step treatment could further improve the efficiency of pretreatment with moderate thermophiles, the extraction rates of iron and sulfur boosted to 64.93% and 65.73% at 15% pulp density after the two-step treatment, which was equivalent to the result obtained at 10% pulp density with normal bio-oxidation process.