Hydrofluoric acid wastewater treatment method and device
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United States of America Patent
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Dec 25, 2007
Grant Date -
Jun 3, 2004
app pub date -
Nov 26, 2003
filing date -
Nov 28, 2002
priority date (Note) -
Expired
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Abstract
The invention provides a hydrofluoric acid wastewater treatment method that achieves efficient recovery of hydrofluoric acid from hydrofluoric acid wastewater and also achieves sufficient reduction in the hydrofluoric acid concentration of the dehydrofluorinated water after treatment.The hydrofluoric acid wastewater treatment method comprises the following steps: a hydrofluoric acid concentration step (S1) comprising concentrating hydrofluoric acid wastewater by evaporation to produce a concentrated hydrofluoric acid water and a hydrofluoric acid-containing vapor; a dissolution step (S2) comprising bringing the hydrofluoric acid-containing vapor obtained in the hydrofluoric acid concentration step (S1) into contact with dissolution water to dissolve the vapor; a neutralization step (S3) comprising bringing the residual hydrofluoric acid-containing vapor left from the dissolution step (S2) into contact with an alkali to produce a neutralized liquid and a dehydrofluorinated vapor; and a condensation step (S4) comprising condensing the dehydrofluorinated vapor obtained in the neutralization step (S3) to produce condensed water.
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