Process for increasing the water solubility of gypsum
OwnerHarold W. Wilsoninventor
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Abstract
A process for increasing the water solubility of gypsum in which gypsum is ground to about 5 to 50 mesh U.S. Standard Sieve Size, about 5 to 95 parts by weight of ground gypsum are mixed with about 2 to 25 parts by weight concentrated sulfuric acid having a concentration of about 93 to 98.5% H.sub.2 SO.sub.4, optionally in the presence of about 5 to 20 parts by weight water, and the resulting product is dried at a temperature of about 100-125.degree. C. to form a water-soluble, granular, solid, free-flowing gypsum product having a water solubility increased by about 2- to greater than 350-fold.
Claims13
A process for increasing the water solubility of gypsum and to form water-soluble, granular, solid, free-flowing gypsum after drying comprising (1) mixing ground gypsum with sufficient concentrated sulfuric acid having a concentration of about 93 to 98.5% H.sub.2 SO.sub.4, to form water-soluble, granular, solid, free-flowing gypsum, and (2) drying the mixture of ground gypsum and concentrated sulfuric acid to form the water-soluble, granular, solid, free-flowing gypsum.
A process for increasing the water solubility of virgin or calcined gypsum comprising grinding the gypsum to about 5 to 50 mesh U.S. Standard Sieve Size, mixing about 5 to 95 parts by weight of the ground gypsum with about 2 to 25 parts by weight of concentrated sulfuric acid having a concentration of about 93 to 98.5% H.sub.2 SO.sub.4, optionally in the presence of about 5 to 20 parts by weight water, and drying the resulting product at a temperature of about 100-125.degree. C.
Dependencies are inferred from the claim text.