Assertion: phosphoric acid's amount | /r/HasProperty | about 14%
Facets:
value: in excess of that necessary
type: OTHER
value: to react with monocalcium phosphate
type: PURPOSE
Source sentences:
text: A method for the production of strong phosphoric acid of at least 40% P 0 content which comprises digesting phosphate rock in strong aqueous phosphoric acid, reacting the resulting monocalcium phosphate solution with sulfuric acid thereby forming a suspension of calcium sulfate hemihydrate crystals in aqueous phosphoric acid of at least 40% P 0 content, said sulfuric acid being added in amounts Which are about 14% in excess of that necessary to react with monocalcium phosphate in said suspension, adding seed crystals of calcium sulfate anhydrite to said suspension, heating this suspension at temperatures of at least C. for about 1-4 hours to convert a major proportion of said calcium sulfate hemihydrate crystals into crystals of calcium sulfate anhydrite, and filtering the slurry so obtained to produce a filter cake of calcium sulfate anhydrite crystals and a filtrate of strong phosphoric acid of at least 40% P 0 concentration.