酸度及酸化介质对铀矿石微生物浸出酸化的影响

通过室内柱浸试验,研究了溶浸液加入硫酸的浓度和酸化介质类型对铀矿石生物浸出酸化阶段的影响。结果表明,当初始硫酸浓度相同时,尾液比清水酸化时间短、耗酸率低,两者浸铀率相差不大,尾液比清水的累计净铁浸出量小,但后期差值逐渐缩小。尾液介质酸化时,随着初始酸度的增大,酸化时间缩短,累计净铁浸出量增加,但耗酸率增高,累计铀浸出率增大。合适的方案为酸化阶段采用尾液介质、40g/L初始硫酸浓度酸化。

Effects of Acidity and Medium on Acidification of Uranium Bioleaching

The effects of initial sulfuric acid concentration and type of acidification media on acidification stage of uranium bioleaching were studied in laboratory through column leaching experiment. The results show that with the same initial concentration of sulfuric acid, the tail liquid acidification has a shorter time, less acid consumption and less leaching amount of cumulative net iron compare to the tap water acidification, and both have the same uranium leaching rate. With an increases of initial sulfuric acid in tail liquid, acidification time is shortened, leaching amount of cumulative net iron increases, both cumulative uranium leaching rate and sulfuric acid consumption rate rise. The optimum acidification conditions include 40 g/L of initial sulfuric acid and medium of tail liquid.