| 摘要 |
<p>Installation for the crystallization of an inorganic substance in a slurry of crystals, by desupersaturation of a supersaturated solution, the installation comprising a crystallization chamber with a vertical axis, divided into a central region (4) and an annular region (5), a device (9, 10) designed to produce a vertical displacement of the slurry in the central region (4) and a displacement in the opposite direction in the annular region (5), a device (8) for drawing off the slurry, comprising a pipe (23, 24) which emerges in one of the abovementioned regions, a means (14) for mechanically shearing the slurry, comprising a disc (17) carrying a ring of shearing teeth (19), and a pipe (6, 31) passing through the lid (30) and being used to admit anhydrous sodium carbonate, the pipe (31) having an extension inside the crystallization chamber on which a film of water is made to move. <IMAGE></p> |
