微波预处理对细菌浸出低品位铀的影响

Effect of Microwave Pretreatment on Bacterial Leaching of Low Grade Uranium

针对难处理铀尾矿因脉石结构多而导致铀浸出率低的问题,提出微波预处理破坏脉石结构提高铀浸出率的思路。采用单因素法考察微波预处理时间对铀浸出率的影响。结果表明:微波预处理20min时,浸出铀浓度为72.75mg/L,铀浸出率为82.92%,较原样提高16.51个百分点。过度延长微波预处理时间,浸出率提高不显著。XRD和SEM分析表明,原样表面光滑、结构致密,20min微波预处理矿物表面粗糙微裂纹生长发育明显,60min微波预处理矿物晶粒生长完善。

To address low uranium leaching rate of uranium tailings with large amount of gangue structure,idea of microwave pretreatment to destroy gangue structure and improve uranium leaching rate was proposed.Effect of microwave pretreatment time on uranium leaching rate was investigated by single factor method.The results show that uranium concentration in lixivium is 72.75 mg/L after 20 minutes of microwave pretreatment,and uranium leaching rate is 82.92%,16.51 percentage points higher than that of untreated.Excessively prolonging microwave pretreatment time does not significantly improved uranium leaching rate.XRD and SEM analysis show that original sample has smooth surface and compact structure.The surface roughness of micro-cracks after 20 min pretreatment is obvious,and grain growth after 60 min pretreatment is perfect.