| 摘要 |
<p>PURPOSE:To obtain AlF3 in a high yield by a method wherein a fluorine-containing gas is absorbed into an aqueous AlF3 solution containing sulfuric acid radicals at a specified concentration, then Al(OH)3 or alumina is added to the solution to form a slurry of hydrated AlF3, or basic AlF3, and the slurry is subjected to solid-liquid separation. CONSTITUTION:The fluorine-containing gas is introduced into an absorbing part 1 via a passage 4 and is absorbed into the aqueous AlF3 solution 2a which is fed into the part 1 from a tank 2 by a pump 3 after being adjusted to a sulfuric acid radical concentation of 3-30g/l by adding sulfuric acid or the like. The solution (absorbing liquid) 2a having absorbed the gas is returned into the tank 2 through a pipe 9, then it is fed to a reaction tank 11 via a pipe 10 and is stirred together with, for example, Al(OH)3 added through a passage 12 to form a slurry of hydrated AlF3. The slurry is fed to a solid-liquid separator 14 through a passage 13, and the hydrated AlF3 separated by the separator 14 is taken out through a passage 16.</p> |
