Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Alkaline earth metal
Patent
1990-06-18
1992-12-29
Dawson, Robert A.
Chemistry of inorganic compounds
Treating mixture to obtain metal containing compound
Alkaline earth metal
106775, 106786, 210751, 423172, 423485, 423555, 423DIG20, C01F 1146, C04B 106
Patent
active
051749726
ABSTRACT:
A process, and the product produced thereby, for the preparation of a waste solidification material from hardened fluorogypsum as a by-product of the manufacture of hydrofluoric acid by reacting fluorospar with sulfuric acid, removing hydrogen fluoride from the reaction product, slurrying the by-product with water, placing the slurried by-product fluorogypsum in settlement ponds until the fluorogypsum hardens, the hardened fluorogypsum having a pH of greater than about 5 to about 13, including heating the hardened fluorogypsum to evaporate substantially all water physically mixed with the fluorogypsum and further heating the fluorogypsum to reduce the water chemically bound to calcium sulfate in the fluorogypsum to form about 0.5% to about 9% by weight.
REFERENCES:
patent: 4035259 (1977-07-01), Casale
patent: 4404105 (1983-09-01), de Lockerente et al.
patent: 4436645 (1984-03-01), Ceaser
patent: 4952242 (1990-08-01), Earp
Published Article-"Recrystallization of Calcium Sulfate Hemihydrate in Acid and Alkaline Media", Zhurnal Prikladnoi Khimit, vol. 49, No. 12, pp. 2626-2629, Dec. 1976, Karmyshov et al., 423-555.
Dawson Robert A.
Drodge Joseph
Ray David L.
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