Production of low-fluorine gypsum as a by-product in a phosphori

Details Production of low-fluorine gypsum as a by-product in a phosphori Production of low-fluorine gypsum as a by-product in a phosphori

1975-12-11

1977-05-31

Vertiz, O. R.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Alkaline earth metal

423320, 423321R, 423555, C01F 100, C01F 500, C01F 1100, C22B 2620

Patent

active

040269906

ABSTRACT:
A process for purifying waste gypsum from the wet phosphoric acid process to a maximum fluorine content of 0.25 % by weight based on the anhydride, which comprises adding active silicic acid in two portions during the course of the phosphoric acid process, wherein at least half the total amount of silicic acid added is added during the decomposition of the crude phosphate and the remainder is added after the end of the decomposition but before the waste gypsum is filtered off, and the waste gypsum, after it has been filtered, is made into a suspension with water, separated from the liquid phase and dried.

REFERENCES:
patent: 1858203 (1932-05-01), Fiske
patent: 1969449 (1934-08-01), Bryan
patent: 2123785 (1938-07-01), Knox et al.
patent: 3151941 (1964-10-01), Hollingsworth et al.
patent: 3193351 (1965-07-01), Miller et al.
patent: 3323864 (1967-06-01), Lapple
patent: 3505013 (1970-04-01), Araki et al.
patent: 3743725 (1973-07-01), Case
patent: 3764658 (1973-10-01), Darwin et al.

Affiliated with

Also associated with

Rating

Production of low-fluorine gypsum as a by-product in a phosphori does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Production of low-fluorine gypsum as a by-product in a phosphori, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Production of low-fluorine gypsum as a by-product in a phosphori will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-658394