铀矿石不同酸度下细菌的溶浸试验

对某铀矿石在不同酸度下细菌溶浸浸铀进行了对比试验,分析了浸出过程中铀浸出率、酸耗和细菌生长等变化规律。结果表明,该铀矿石不同酸度下细菌溶浸效果较好,液计平均浸出率为87.7%,渣计平均浸出率为94.1%;另外,在酸化阶段,硫酸浓度对浸出总耗酸影响不大,但浓酸可以大幅度缩短酸化时间;在细菌浸出阶段,pH越高耗酸越低,细菌生长情况越好,但铀浸出率并未随之增高,主要是因为较高pH的浸出液中容易产生铁的氢氧化物和铁矾沉淀,阻止了铀的进一步浸出。

Experiment of Bioleaching of Uranium Ore under Different Acidities

The bioleaching experiment was carried out for one uranium ore under different acidities. The uranium leaching rate, acid consumption and bacterial growth in the leaching process were analyzed. The results show good bacterial leaching can be achieved on this uranium ore with the average leaching rate of liquid of 87.7%, and the average leaching rate of slag of 94.1%. The concentration of sulfuric acid at different stages of acidification has little effect on the overall consumption of acid. Concentrated sulfuric acid can reduce the acidification time significantly. In bacteria leaching, the higher the pH value is, the less the acid consumption and the better the growth of bacteria are. To note, leaching rate is not improved with the good growth of bacteria as expected, which is due to the forming of iron hydroxide and precipitation of ferroalumen.