Method for reducing fluoride ion content in calcium chloride
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United States of America Patent
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Issued Date -
Apr 27, 2006
app pub date -
Oct 26, 2004
filing date -
Oct 26, 2004
priority date (Note) -
Abandoned
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Abstract
The content of fluoride ions in aqueous solutions of calcium chloride is reduced by contacting with activated alumina. The contacting can be accomplished either as a batch slurry process or a continuous process using a fixed bed. The adsorption rate of fluoride ions by the activated alumina is increased by pre-treating the alumina with either an aqueous acid or a sulfate solution. Spent alumina can be regenerated by washing with dilute caustic.
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