Recovery of rare earths from ion-absorbed rare earths ore with MgSO4-ascorbic acid compound leaching agent

The optimum leaching condition in MgSO4-ascorbic acid leaching system leaded to 107.5% of rare earth leaching efficiency and 5.77% Ce partition in the leaching liquor. The leaching efficiency of colloid sediment phase rare earth was up to 85.7%. This method would reduce the consumption of MgSO4 and achieve the simultaneous leaching of colloidal sediment phase and ion-exchangeable phase rare earth. It would have great significance to environmental-friendly extraction of ion-adsorption type rare earths ore and the improvement of resource utilization.114