| 摘要 |
PCT No. PCT/JP90/01283 Sec. 371 Date May 30, 1991 Sec. 102(e) Date May 30, 1991 PCT Filed Oct. 4, 1990 PCT Pub. No. WO91/04777 PCT Pub. Date Apr. 18, 1991.A crystal refining apparatus having a refining column containing a plurality of vertical shafts having screw blades provided therearound. Each blade rotates in a opposite direction, thereby carrying refined solid crystals upward. The reflux ratio of this apparatus can be much greater than that of the prior art, and highly refined crystals are obtained. The separated liquid extraction chambers are disposed at the bottom and the side of the refining column and a pressure reduction line is connected thereto so that the separated liquid is extracted at a high rate, accordingly the reflux ratio has become great in value.
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