Process for the recovery of calcium salts from calcium hypochlorite process effluents
US4348371A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 4, 1981 |
| Grant date | Sep 7, 1982 |
| Priority date | — |
| Expiry date | May 4, 2001 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01B11/145
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A process for the recovery of calcium chloride hydrates and calcium chlorate compounds comprises: PA1 (a) blending an effluent comprised of an aqueous solution of calcium chloride, calcium chlorate, and calcium hypochlorite and having a weight ratio of Ca(ClO.sub.3).sub.2 /CaCl.sub.2 of less than about 0.2 with a second mother liquor comprised of an aqueous solution of calcium chlorate and calcium chloride and having a weight ratio of Ca(ClO.sub.3).sub.2 /CaCl.sub.2 of greater than about 1.0 to form a blended solution; PA1 (b) feeding the blended solution to a first crystallizer to form a slurry of calcium chloride hydrate in a first mother liquor; PA1 (c) separating the crystals of calcium chloride hydrate from the first mother liquor, the first mother liquor having a weight ratio of Ca(ClO.sub.3).sub.2 /CaCl.sub.2 of at least about 1.0; PA1 (d) feeding the first mother liquor to an evaporative crystallizer to form a crystalline calcium chlorate compound; PA1 (e) separating the crystalline calcium chlorate compound from a second mother liquor; PA1 (f) recovering the crystalline calcium chlorate compound; and PA1 (g) returning the second mother liquor to step (a).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.