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rare earth mineral grinding process

After leaching therare-earthoxide in a phosphor with 1 kmol/m 3 H 2 SO 4, the residue was ground by a planetary mill with10 kmol/m 3 KOH solution in order to convertrare-earthphosphate to hydroxide. The product was leached with 2 kmol/m 3 H 2 SO 4. At present, the completeness of leaching of terbium, cerium, and lanthanum is only 10% even ...

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