Patent ID: 7311799
Filing Date: 2007-12-25
Classification: B01D,B01J,C01B,C02F

Abstract:
1. A hydrofluoric acid wastewater treatment method, comprising the following steps: a hydrofluoric acid concentration step comprising concentrating hydrofluoric acid wastewater by evaporation to produce a concentrated hydrofluoric acid water and a hydrofluoric acid-containing vapor; a dissolution step comprising bringing the hydrofluoric acid-containing vapor obtained in the hydrofluoric acid concentration step into contact with dissolution water to dissolve the vapor; a neutralization step comprising bringing the residual hydrofluoric acid-containing vapor which has not been dissolved in the dissolution water and remains undissolved in the dissolution step into contact with an alkali to produce a neutralized liquid and a dehydrofluorinated vapor; and a condensation step comprising condensing the dehydrofluorinated vapor obtained in the neutralization step to produce condensed water.