| 摘要 |
PROBLEM TO BE SOLVED: To provide a separation and recovery method of hydrogen fluoride and a separation and recovery apparatus of hydrogen fluoride, with which hydrogen fluoride is efficiently recovered from calcium fluoride discharged from various steps.SOLUTION: A separation and recovery method includes: a gas separation step to separate fluorine ingredients as a hydrogen fluoride-based gas by filling a closed type vertical reactor R with a calcium fluoride-based raw material (recovered calcium fluoride) and vertically stirring the raw material with a stirring blade 2a of stirring means 2 while adding sulfuric acid etc. thereto; a step to make an ejector E generate negative pressure by circulating an aqueous absorbent stored in a recovery storage tank T through the ejector E by using a pump P; a gas recovery step to suck out the hydrogen fluoride-based gas generated in the vertical reactor R by using the negative pressure and to recover and feed the gas into the recovery storage tank T; and a hydrogen fluoride concentration step to repeat circulation of the aqueous absorbent and recovery of the generated hydrogen fluoride-based gas in batches.SELECTED DRAWING: Figure 1 |
