| 摘要 |
<p>PURPOSE:To prevent an accident such as clogging in a pipeline resulting from the supply of chemicals, etc. by controlling the concn. of a fluoride releasing liquid with the two items of total HF and total NH4F, supplying chemicals, etc. to an appropriate place, and carrying out the operation of a metal releasing process. CONSTITUTION:A crystallizer 10 is provided with a mixing zone 18, a stationary organic solvent zone 13, and a stationary fluoride releasing liquid zone 20, also provided below said zones with a fluoride metallic complex crystal separation zone 27 and a crystal growth zone 21 or a releasing liquid cooling zone 22, and operated as follows. Namely, an organic solvent S contg. extracted metallic ions is brought into contact with a fluoride releasing liquid D in the zone 18 to deposit fluoride metallic complex crystals X. Then to convert the crystal X into metal (oxide), an NH4HF2 soln. is supplied into the zone 21 or 22 of the crystallizer 10, and the discharged 28 liquid D wherein a fluoride metallic complex crystal decomposing gas G is supplied to the zone 18. The filtrate after separating crystals is supplied into the zone 20 below the zone 13, and the liquid D is circulated and reused.</p> |
