English name ion-absorbingtyperare earthsore
Ion-adsorbed rare earth ores are mainly distributed in Jiangxi, Guangdong, Hunan, Guangxi, Fujian and other places in China.
At present, there are two extraction methods for ionic rare earth ore.
(1) Extraction of rare earth from ion-adsorbed ore with NaCl
The use of NaCl is currently one of the main chemical beneficiation methods for the treatment of this type of ore. The ore from the mining site is fed into a rectangular cement pond for immersion, and the leachate is discharged from the discharge port through the filtration layer at the bottom of the tank. After removal, the leachate is precipitated in a saturated oxalic acid solution, filtered, and the filtrate is neutralized by lime and added with salt to be returned for reuse; the filter cake is a rare earth oxalate, which is burned, washed with water, and then calcined to obtain a mixed rare earth oxide. . The main problem currently existing in this process is that the leaching residue contains high NaCl and causes soil salinization.
(2) Ammonium sulfate method
The extraction of rare earth from ion-adsorbed ore with (NH4)2SO4 is a successful method in recent years. The difference from the NaCl method is that the ore is obtained by soaking the ore with 1%~2% of (N H4) 2 SO, followed by precipitation with oxalic acid, and then obtaining REO>90% by one burning. The mixed rare earth oxides are returned to the filtrate by adding sulfuric acid. Compared with the NaCl method, the leaching residue does not cause the problem of salinization in the upper soil.
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