| 摘要 |
<p>Calcium hypochlorite particles and larger separable sodium chloride crystals produced in a process for manufacturing calcium hypochlorite are effectively separated by use of a staged upward-flow elutriator-classifier. In particular, an aqueous slurry of the calcium hypochlorite particles and sodium chloride crystals are introduced into about the mid-point of the classifier and elutriated with fluid substantially saturated in calcium hypochlorite and sodium chloride. A first slurry in which the solid phase is predominantly calcium hypochlorite, e.g., at least 95 weight percent, is removed as overflow from the top of the classifier, and a second slurry in which the solid phase is predominantly sodium chloride is removed as underflow from the bottom of the classifier. In one embodiment, the first slurry is separated into a wet cake of calcium hypochlorite and bleach mother liquor, a portion of which liquor is used as elutriating fluid. The second slurry is separated into a wet cake of sodium chloride and salt mother liquor, which liquor is recycled to the bottom of the classifier. The wet cake of sodium chloride is washed with a fluid unsaturated in calcium hypochlorite and the washed sodium chloride recovered.</p> |
