Process for the treatment of a calcium aluminophosphate
US4321244A · kind A · utility
15Cited by
5References
19Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 5, 1980 |
| Grant date | Mar 23, 1982 |
| Priority date | — |
| Expiry date | Aug 5, 2000 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01B25/232
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A process for treating a rock essentially constituted by calcium aluminophosphate, comprising the treatment of the ground rock with a concentrated sulfuric acid in stoichiometric excess with respect to calcium and aluminum, at a temperature of above about 120.degree. C., for a time between a few minutes and about 5 hours, followed by controlled water take-up. Subsequently, a residue containing substantially all the calcium and the aluminum of the rock and a solution of the acids serving to digest a tricalciumphosphate charge are separated. The process is particularly suitable for the treatment of Thies phosphate ore.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.