Manufacture of solid ammonium phosphate
US4017588A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 2, 1975 |
| Grant date | Apr 12, 1977 |
| Priority date | — |
| Expiry date | Sep 2, 1995 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC05B7/00
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
The invention relates to a process for the manufacture of solid monammonium phosphate with good granulation properties suitable for use in compound fertiliser manufacture. An improvement in product quality is obtained when between 20% and 80% of an aqueous slurry of ammonium phosphate, formed by the ammoniation of wet-process phosphoric acid, is mixed with a second acid prior to entry into a moisture disengagement unit. This treatment precipitates some monammonium phosphate crystals which provide nuclei for further crystal growth. After a short time delay to allow crystals to form, the remainder of the slurry is then added separately to the moisture disengagement unit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.