论文部分内容阅读
本文研究了在不同的压力(1—68个大大气压)和温度(29—70℃)下,用 Na_2CO_3—NaHCO_3混合浸出剂从低品位矿石中浸出铀的动力学。铀的产率和浸出速率随温度和压力而增加,呈函数关系。同样在70℃下浸出4小时,常压条件下铀的最高浸出率为61%,10个大气压条件下为96.9%。在1个和10个大气压下所测得的活化能分别为3.86和3.45千卡/摩。对于氧分压来说所测得的铀浸出反应级数为0.31。用扫描电子显微技术研究了低品位铀矿石和浸出渣的表面特征。
In this paper, the kinetics of leaching uranium from low-grade ore with Na_2CO_3-NaHCO_3 mixed leaching agent under different pressures (1-68 atm) and temperature (29-70 ℃) was studied. Uranium yield and leaching rate increase with temperature and pressure, as a function of. Also leached at 70 ° C for 4 hours, the maximum uranium leaching rate was 61% at atmospheric pressure and 96.9% at 10 atm. The activation energies measured at 1 and 10 atmospheres were 3.86 and 3.45 kcal / mol, respectively. The uranium leaching reaction order was 0.31 for the oxygen partial pressure. The surface features of low grade uranium ore and leached residue were studied by scanning electron microscopy.