Assertion: wet process phosphoric acid | /r/CapableOf | contain to 45 weight percent
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Source sentences:
text: A method for producing sodium silicoflu oride of high purity from wet process phosphoric acid containing to 45 weight percent P 0 and 1 to 5 weight percent hydrofluosilicic acid which comprises filtering said wet process phosphoric acid to remove organic impurities therefrom with calcium sulfate crystals formed by hydrating calcium sulfate semihydrate in a medium selected from the group consisting of water and phosphoric acid, and adding to said filtered wet process phosphoric acid a sodium compound selected from the group consisting of sodium carbonate, sodium hydroxide, sodium chloride, sodium sulfate and sodium phosphate in the presence of a fluoride in an amount less than 10 grams per liter of said wet process phosphoric acid to form sodium silicofluoride, said fluoride being selected from the group consisting of sodium fluoride, sodium bifluoride and a mixture thereof.