| 摘要 |
FIELD: chemistry.SUBSTANCE: method for industrial cleaning of a stream of a low-grade polyvalent cation with purity P1 by forming a precipitate of a double salt of the polyvalent cation with purity P2 and a solution of the polyvalent cation with purity P3, where P2>P1>P3, comprises the following steps: (a) forming from said stream a medium which contains water, the polyvalent cation, a cation selected from a group consisting of ammonia, alkali metal cations, protons and any combination thereof, and anions, wherein the formed medium is further characterised by presence of (i) a precipitate of a double salt which contains a polyvalent cation, at least one of said cations and at least one of said anions; and (ii) a solution of the polyvalent cation; wherein concentration of said anions is higher than 10% and the ratio of concentration of said cation and said anion in said solution of the polyvalent cation is in the range of the DS zone, which is defined in the present document; and (b) separating at least a portion of said precipitate from said solution.EFFECT: obtaining material for producing a product of high purity.35 cl, 6 tbl, 4 ex |
