FIELD: chemistry.
SUBSTANCE: invention relates to chemistry. Aluminium salt solution is purified from iron by acidifying a mineral acid solution to concentration of 4.5-5.5 g-eq/dm3. The acidified solution is brought into contact with a granular cationite containing phosphonic acid functional groups. Iron is desorbed from the cationite with 3.5-5.3 M phosphoric acid solution. The steps for sorption and desorption of cationite are carried out in dynamic conditions.
EFFECT: invention increases the degree of purification of aluminium salts from iron and output of the purified salt per unit mass of the cationite.
3 cl, 3 tbl, 4 ex
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