| 摘要 |
<p>PURPOSE:To fatilitate the long-term continuous operation of a crystallizer by stabilizing a crystallization condition, in operating the crystallizer, by imparting a concn. and temp. condition suitable for each liquid phase. CONSTITUTION:When an org. solvent S extracting and containing a Fe<3+> ion is guided to a mixing tank 13 through a temp. controller 11 and a release solution D comprising NH4HF2 is guided to said mixing tank 13 through a heater 12, an iron/fluorine complex is formed by iron release reaction and deposited as a crystal if the release reaction is succeedingly performed. Subsequently, the release solution containing the crystal reaches a crystal growing or cooling zone 17 to promote the growth of the crystal. Further, the release solution is discharged from a discharge port 21 through a crystal separation zone 20 and the crystal is discharged from a crystal discharge pipe 22. In operating this apparatus, the concn. of the release solution discharged from the apparatus is held to 85-115g/ las NH4HF2, the temp. of the org. solvent supplied to the apparatus to 20- 25 deg.C, the liquid temp., when the org. solvent and the release solution are mixed, to 40 deg.C or less and the temp. of the release solution in the above mentioned zone 17 to 15-20 deg.C.</p> |
