复合铵盐浸出风化壳淋积型稀土矿的研究

摘要

采用复合铵盐作浸出剂浸出风化壳淋积型稀土矿中的稀土.考察浸出剂的配比、浓度、液固比、流速、pH等因素对稀土浸出率的影响.结果表明,NH4Cl、NH4NO3、(NH4)2SO4质量比为4∶5∶6的复合铵盐浸出剂为最佳组合；液固比越大、流速越慢,浸出率越高；当浸出剂浓度为10 g/L、pH=3.5时浸出效果最好.%Rare earth (RE) was leached from weathered crust elution-deposited rare earth ore with composite ammonium salts as leaching agent.The effects of ratio of composite ammonium salts and concentration of leaching agent, ratio of liquid to solid (L/S) , flow rate and pH value on leaching rate of RE were investigated.The results show that the best mass ratio of leaching agent of NH4Cl, NH4NO3, (NH4)2SO4 is 4:5 : 6.The bigger L/S and lower flow velocity is, the higher leaching rate is.The best leaching effect is achieved when concentration of leaching agent is 10 g/L and pH value is 3.5.