Conversion of extraction residues originating from phosphoric acid decontamination to solid deposition products
US4279876A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 7, 1980 |
| Grant date | Jul 21, 1981 |
| Priority date | — |
| Expiry date | Mar 7, 2000 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA62D2101/45
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
The invention relates to a process permitting acid salt residues, hereinafter called raffinates, which are obtained in the decontamination of phosphoric acid by extraction with a solvent, to be converted to solid deposition products, wherein the raffinates are admixed with a quantity of water necessary for them to ensure, after reaction with hydrate of lime or quicklime, the formation of an aqueous filterable suspension. More particularly, the raffinates are admixed with a quantity of hydrate of lime or quicklime necessary for them to ensure, after reaction and filtration of the suspension, the formation of a filter cake having a pH-value within the range 9 to 14. The reaction suspension is filtered as soon as it has assumed a pH-value within the range 5 to 8 and the resulting filter cake is allowed to react completely and deposited.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.