Assertion: wet process phosphoric acid | /r/MadeOf | hydrofluosilicic acid
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Source sentences:
text: A method for producing sodium silicofiuoride of high purity from wet process phosphoric acid containing hydrofluosilicic acid which comprises adding to said 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 selected from the group consisting of sodium fluoride, sodium bifluoride and a mixture thereof to form sodium silicofluoride.