Removal of magnesium and aluminum impurities from wet process ph

Details Removal of magnesium and aluminum impurities from wet process ph Removal of magnesium and aluminum impurities from wet process ph

1978-03-09

1981-11-10

Vertiz, O. R.

Chemistry of inorganic compounds

Phosphorus or compound thereof

Oxygen containing

C01B 2516

Patent

active

042998042

ABSTRACT:
Magnesium and aluminum impurities may be removed from wet process phosphoric acid by adding a fluoride ion donating compound, such as hydrofluoric acid, for example, to thereby provide about four fluoride ions for each aluminum ion. Also, preferably, an aluminum ion donating compound, such as alum is added to the wet process acid to bring the aluminum ion to magnesium ion ratio up to about two to one to facilitate formation of crystalline compounds having the general stoichiometry MgAl.sub.2 F.sub.8. The treated filter grade acid is then further treated in a crystallizer to form large crystals which will readily precipitate so the purified liquid phase, low in magnesium and aluminum containing impurities, may be separated from the crystalline phase.

REFERENCES:
patent: 3379501 (1968-04-01), Treitler et al.
patent: 3494736 (1970-02-01), Carothers et al.
patent: 3800029 (1974-03-01), Omoto et al.
patent: 4136199 (1979-01-01), Mills
Lehr, Fluorine Behavior in WPA Production, pp. 1-20, Paper Presented at Aiche Meeting in Bartow, Fla. on 2/8/77.
Frazier et al., Chemical Behavior of Fluorine in WPA, Environmental Science & Tech., vol. 11, No. 10, 10/77, 1st Presented 8/75.

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