Method for fixing fluorine and phosphorus in waste water containing fluorophosphoric acid-derived compound to remove them
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United States of America Patent
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Dec 23, 2003
Grant Date -
N/A
app pub date -
Feb 12, 2002
filing date -
Feb 5, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method is provided for fixing and eliminating fluorine and phosphorus in waste water wherein the waste water includes a fluorophosphate compound in which hydrochloric acid is added to the waste water including the fluorophosphate compound. The waste water to which hydrochloric acid has been added is heated in order to decompose the fluorophosphate compound into hydrogen fluoride and phosphoric acid, while hydrogen chloride gas located within a treating vessel in which the waste water is contained is introduced into a condenser provided outside of the treating vessel, and then a calcium salt is added to the waste water after decomposition in order to fix and eliminate fluorine and phosphorus.
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