| 摘要 |
An apparatus for purifying crystals comprises a crystal purifying tower (1) having a transverse cross-section of two partially overlapping circles, stirrers (2) each comprising a rotational shaft passing through the center of each of the circles and having blades (3) disposed spirally on its surface, a solid-liquid separation plate (4) disposed at the bottom portion of the tower, a liquid take out means (5) disposed below the separation plate, a starting crude crystal feed means (6) disposed above the separation plate, a purified crystal take out means (8) disposed at the upper portion of the tower, heating means (7) disposed in the tower in a multistage manner along the longitudinal direction of the tower, and purified crystal circulation means (9, 10, 11, 12, 13) for cooling a portion of purified crystals taken out from the tower and feeding back the cooled crystals to the tower at at least one portion of the tower. |
