Method for producing calcium borate
AssigneeU.S. Borax Inc.
InventorDavid M. Schubert
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Abstract
An improved method is provided for producing crystalline calcium hexaborate tetrahydrate, synthetic nobleite, by the reaction of boric acid and lime in an aqueous slurry. Reaction conditions include boric acid to water molar ratios of greater than 0.25:1, lime to boric acid molar ratios in the range of 0.05-0.15:1 and temperatures in the range of 85.degree.-105.degree. C. A novel crystalline product is produced having a unique crystal habit resulting in improved physical properties. Dehydration of this product produced a novel amorphous, anhydrous product having similar crystal habit and physical properties.
Claims15
The method of producing crystalline calcium hexaborate tetrahydrate which comprises reacting boric acid and lime in an aqueous slurry, at a temperature in the range of from about 85.degree. to about 105.degree. C., wherein the molar ratio of boric acid to water is in the range of from about 0.25 to 0.5:1 and the molar ratio of lime to boric acid is in the range of about 0.05 to about 0.15:1, and separating said crystalline calcium hexaborate tetrahydrate from said aqueous slurry.
The method of producing crystalline calcium hexaborate tetrahydrate which comprises reacting boric acid and lime in an aqueous slurry, at a temperature in the range of from about 95.degree. to about 101.degree. C., wherein the molar ratio of boric acid to water is in the range of from about 0.3 to about 0.45:1, and the molar ratio of lime to boric acid is in the range of from about 0.1 to about 0.13:1, and separating said crystalline calcium hexaborate tetrahydrate from said slurry.
Dependencies are inferred from the claim text.