Process for obtaining an aluminum sulfate hydrate from an impure sulfuric acid solution of aluminum sulfate
US4171205A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 28, 1978 |
| Grant date | Oct 16, 1979 |
| Priority date | — |
| Expiry date | Dec 28, 1998 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01F7/746
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Process for recovering aluminum in the form of a specific acid sulfate from an initial solution containing aluminum in the form of dissolved aluminum sulfate hydrate in which the specific acid sulfate is of the formula Al.sub.2 (SO.sub.4).sub.3.0.5H.sub.2 SO.sub.4.11 to 12 H.sub.2 O and in which the initial solution is sequentially treated in a series of crystallizers, wherein successive crystallizers are maintained at a predetermined decreased generally fixed temperature such that in each crystallizer a state of supersaturation of aluminum acid sulfate exists and the parameters attendant operation of each crystallizer insure that a state of static equilibrium of precipitation of product is generally reached before the process solution/slurry is passed to a successive crystallizer, or filtered for recovery of product.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.