Removal of fluorine during production of fertilizer
US4175944A · kind A · utility
1Cited by
9References
4Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 26, 1978 |
| Grant date | Nov 27, 1979 |
| Priority date | — |
| Expiry date | Jun 26, 1998 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S71/03
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
The invention provides a novel process for the removal of fluorine during the production of fertilizer by precipitating the ion during the ammoniation step and recovering same by pyrolysis. To recover the fluorine the fertilizer is first separated out as a filtrate and the precipitate is heated to evolve ammonium fluoride, which heating is done in an ammonia atmosphere.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.