(1) The extraction of rare earth from ion-adsorbed ore by NaCl is one of the main chemical beneficiation methods for treating this type of ore. The ore transported from the stope is sent to a rectangular cement tank for immersion, and the leaching solution is discharged from the discharge port through the filter layer at the bottom of the tank. The leaching slag is manually removed, and the leaching solution is precipitated in a saturated oxalic acid solution, filtered, and the filtrate is passed through lime. Neutralize and add salt to return and reuse; the filter cake is rare earth oxalate, which is mixed with rare earth oxide by burning, washing with water and then burning. The main problem currently existing in this process is that the leaching residue contains high NaCl and causes soil salinization. Â Â Â
(2) Ammonium sulfate method The extraction of rare earth from ion-adsorbed ore with (NH 4 ) 2 SO 4 is a successful method in recent years. The difference from the NaCl method is that the ore is immersed in a solution of 1% to 2% of (NH 4 ) 2 SO 4 , followed by precipitation with oxalic acid to obtain a rare earth oxalate, and after one burning, a REO of >90% is obtained. The mixed rare earth oxide is used, and the filtrate is returned by adding ammonium sulfate. Compared with the NaCl method, the leaching residue does not cause soil salinization problems.
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