Method of stabilizing wet process phosphoric acid for solvent extraction
US4327061A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 30, 1980 |
| Grant date | Apr 27, 1982 |
| Priority date | — |
| Expiry date | Jun 30, 2000 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P10/20
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A method of stabilizing wet process phosphoric acid containing acid soluble impurities preparatory to solvent extraction for the recovery of valuable minerals. The acid is introduced into a vessel containing crystal seed bed of the impurities. A portion of the acid then is withdrawn and concentrated to effect supersaturation of the impurities contained therein. The supersaturated acid is returned to the vessel to mix with the remaining solution and cause additional impurities to precipitate. Thereafter, a portion of the solution, containing precipitated impurities, is withdrawn and introduced into a separator. In the separator, the solution is separated into an essentially solids-free stream containing unprecipitated soluble impurities and a solids-containing stream. The solids-free stream is admixed with an aqueous diluent to dilute it to a concentration level below the concentration at which the precipitable impurities are saturated therein but without a substantial change in phosphate concentration to thereby stabilize the acid stream. The stabilized acid is contacted with an organic extractant to selectively extract at least one of the remaining unprecipitated soluble impuritie…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.