FIELD: extraction of rare-earth metals of waste of fertilizer production, namely, extraction of phosphogypsum. SUBSTANCE: phosphogypsum is treated by water, or by mineral acid, or by solution of inorganic salt. Thus obtained solution is isolated of precipitate, rare-earth metals are extracted of filtrate. The process is carried out with the help of gaseous ammonia and air, ratio of ammonia and oxygen being 1:(2-4) respectively. The process takes place at 25-60 C and at pH 3.5-6.6, pH 5.5-6.4 being preferable. EFFECT: improved efficiency of the method. 2 cl, 1 tbl, 1 dwg
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