Production of anhydrous hydrogen fluoride from low-grade metallic fluorides and sulfuric acid
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United States of America Patent
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Oct 16, 1984
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N/A
app pub date -
Dec 15, 1983
filing date -
Dec 15, 1983
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Expired
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Abstract
A novel method is provided for the production of anhydrous hydrofluoric acid from low-grade metallic fluorides using an intermediate aluminum fluoride compound. The method involves the reaction of low-grade metallic fluorides such as fluorspar with sulfuric acid to produce weak hydrofluoric acid. The weak acid is then reacted with a metallic salt (such as aluminum chloride) to form precipitated aluminum fluoride (AlF.sub.3.3H.sub.2 O). After dewatering, the aluminum fluoride is reacted with strong sulfuric acid to form aluminum sulfate and strong hydrofluoric acid.
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