Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Alkaline earth metal
Patent
1981-12-14
1983-09-06
Straub, Gary P.
Chemistry of inorganic compounds
Treating mixture to obtain metal containing compound
Alkaline earth metal
423170, 423555, 106109, C01F 514, C01F 1146, C04B 1100
Patent
active
044029225
ABSTRACT:
A process for making an industrially usable gypsum from fluoroanhydrite in which fluoroanhydrite is contacted with a fluid reaction medium slurry containing soluble sulfate ions and a substantial proportion of small gypsum seed crystals to rapidly hydrate a large proportion of the fluoroanhydrite to a coarser, substantially pure gypsum. The slurry is clarified to separate coarse purified gypsum reaction product, and the reaction medium is reconstituted and recycled containing gypsum crystals less than the desired reaction product size and constituting about 50-90% of the total solids of the reconstituted fluid reaction medium.
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Skoog et al., Fundamentals of Analytical Chemistry, Holt, Rinehart & Winston, New York, N.Y., 1963, pp. 180-186.
Gaynor John C.
Palmer Jay W.
Kurlandsky Samuel
Roberts Kenneth E.
Robinson Robert H.
Straub Gary P.
United States Gypsum Company
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