Treatment of phosphate-containing wastewater with fluorosilicate and phosphate recovery
US11919792B2 · kind B2 · utility
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59Claims
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Key dates
| Filing date | Sep 21, 2012 |
| Grant date | Mar 5, 2024 |
| Priority date | — |
| Expiry date | Jul 29, 2035 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC02F2101/14
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
A method for treating phosphate-containing wastewater, such as phosphogypsum pond water. The method includes the steps of: (a) adding a first cation to the wastewater to precipitate fluorosilicate from the wastewater; (b) adding a second cation to the wastewater to precipitate fluoride from the wastewater; (c) raising the pH of the wastewater to precipitate the second cation from the wastewater; (d) removing residual silica from the wastewater; and (e) precipitating phosphate from the wastewater. The precipitated fluorosilicate may be sodium fluorosilicate. The precipitated phosphate may be struvite.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.