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目的:以西藏玉龙次生硫化铜铜矿为研究对象,考察了该矿石生物浸出的可行性,并且研究了矿石粒度对生物浸出的影响。方法:在小型柱式反应器中,利用实验室在45℃条件下富集获得的一种中等嗜热浸矿富集物进行了小型生物柱浸试验。结果:与常规酸浸相比,中等嗜热浸矿微生物的存在很大幅度地促进了Cu的浸出,可以使Cu的浸出率提高25%,硫酸消耗量减少33%。该矿石经过110天的生物浸出后,5~10 mm粒级矿石最终浸出率高达89%,而15~25 mm粒级矿石最终浸出率为57%,浸出渣相经过XRD分析发现,5~10 mm粒级渣相中出现大量的黄钾铁矾和少量的硫单质。结论:微生物存在可以显著地提高该矿石铜的浸出率,同时降低酸耗。并且随着该矿石粒度的减小,铜的浸出速率显著加快。
OBJECTIVE: To investigate the feasibility of bioleaching of ore from Yulong secondary copper sulphide copper and copper in Tibet, and to study the effect of ore size on bioleaching. METHODS: Small-scale bio-column immersion tests were performed in a small column reactor using a medium-thermophilic leaching concentrate enriched in laboratory conditions at 45 ° C. Results: Compared with the conventional acid leaching, the presence of moderately thermophilic leaching microorganisms greatly promoted the leaching of Cu, which could increase the Cu leaching rate by 25% and the sulfuric acid consumption by 33%. After 110 days of bioleaching, the final leaching rate of 5 ~ 10 mm grain size ore reaches as high as 89%, while the final leaching rate of 15 ~ 25 mm grain size ore is 57%. XRD analysis of leached slag phase shows that 5 ~ 10 A large amount of jarosite and a small amount of elemental sulfur occur in the grain size slag phase. Conclusion: The presence of microorganisms can significantly improve the copper leaching rate of the ore, while reducing acid consumption. And as the ore size decreases, the copper leaching rate is significantly accelerated.