Title:
REMOVING MAGNESIUM AND ALUMINUM IMPURITIES FROM WET TYPE PHOSPHORIC ACID
Document Type and Number:
Japanese Patent JPS5567516
Kind Code:
A
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.
Inventors:
KENISU RII PAAKUSU
KAIRU DENDA KUREBUENGA
DANIYUARU PATORITSUKU MAKUDANA
KAIRU DENDA KUREBUENGA
DANIYUARU PATORITSUKU MAKUDANA
Application Number:
JP16440678A
Publication Date:
May 21, 1980
Filing Date:
December 29, 1978
Export Citation:
Assignee:
AGRICO CHEM CO
International Classes:
C01B25/22; C01B25/222; C01B25/238; (IPC1-7): C01B25/18
Domestic Patent References:
| JP46011081A |