FIELD: chemistry.
SUBSTANCE: invention relates to inorganic materials. Disclosed is iron (III) orthophosphate of general formula FePO4•nH2O, where n≤2.5. Iron (II) compounds, iron (III) compounds or mixed iron (II) and iron (III) compounds selected from hydroxides, oxides, hydroxy oxides, oxide hydrates, carbonates and hydroxycarbonates react with phosphoric acid with concentration of 5-50%. After reaction, the present iron (II) is converted to iron (III) by adding an oxidant and iron (III) orthophosphate is extracted.
EFFECT: invention enables to obtain a product with a highly developed surface and high packed density.
17 cl, 2 dwg, 2 ex
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