Methods for concentrating rare-earth metals in phosphogypsum and removing thereof from wet process p

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The present invention relates to a method for producing rare-earth metals (REM) compounds by complex processing of apatite, in particularly to a method for concentrating rare-earth metals (REM) in phosphogypsum, where to a process of decomposition of the REM containing raw phosphate material with sulphuric acid, a sodium salt in the amount of 0.25-5.0 kg in terms of Na2O or a potassium salts in the amount of 0.25-5.0 kg in terms of K2O or a mixture thereof in the amount of 0.25-5 kg in terms of Na2O and K2O to 1 kg of REM (in terms of Ln2O3 present in raw phosphate material) is added. The yield of REM transfer into phosphogypsum is up to 98%.