Removal of magnesium and aluminum impurities from wet...

Details Removal of magnesium and aluminum impurities from wet... Removal of magnesium and aluminum impurities from wet...

C - Chemistry, Metallurgy

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C01B 25/237 (2006.01) C01B 25/22 (2006.01) C01B 25/222 (2006.01) C01B 25/238 (2006.01)

Patent

CA 1117730

REMOVAL OF MAGNESIUM AND ALUMINUM IMPURITIES FROM WET PROCESS PHOSPHORIC ACID 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 MgAl2F8. 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.

318725

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