Chemistry of inorganic compounds – Phosphorus or compound thereof – Oxygen containing
Patent
1984-01-06
1985-11-19
Heller, Gregory A.
Chemistry of inorganic compounds
Phosphorus or compound thereof
Oxygen containing
423116, 423158, 423317, 423465, C01B 2516
Patent
active
045541442
ABSTRACT:
Magnesium and aluminum impurities are removed from aqueous phosphoric acid by treatment with a fluorine material and an alkali metal containing material in such a manner that the atomic ratio of fluorine to aluminum is adjusted so that it is greater than about 2 and the alkali metal plus magnesium to aluminum atomic ratio to a value no greater than about 2. In one embodiment the fluorine to aluminum ratio is below about 11, preferably between about 4 and about 8. By controlling such atomic ratios in the limits prescribed, a more purified aqueous phosphoric acid can be produced having a substantial reduction in the magnesium and aluminum content thereof. The process is useful for wet-process phosphoric acids. The process is also particularly useful for acids having low P.sub.2 O.sub.5 content and/or high aluminum concentration. The purification process does not require evaporation for the removal of impurities, as for example fluorine as silicon tetrafluoride.
REFERENCES:
patent: 3494736 (1970-02-01), Carothers et al.
patent: 4136199 (1979-01-01), Mills
patent: 4243643 (1981-01-01), Mills
Gosz William G.
Heller Gregory A.
Occidental Research Corporation
Tao James F.
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