Method for production of ammonium phosphate from phosphate rock slurry
US11261088B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 26, 2020 |
| Grant date | Mar 1, 2022 |
| Priority date | — |
| Expiry date | Sep 26, 2040 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D2257/302
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A method for production of ammonium phosphate from phosphate rock slurry. The method includes: introducing flue gas containing SO2 into a phosphate rock slurry, to yield an absorption solution; evaporating waste ammonia water containing 10-20 wt. % ammonia to yield ammonia gas; introducing the ammonia gas into the absorption solution at a temperature of 110-135° C. until a neutralization degree of the absorption solution reaches 1.5-1.6, thus yielding an ammonium phosphate solution and calcium sulfate; separating the calcium sulfate from the ammonium phosphate solution; and introducing the ammonium phosphate solution to a granulator for granulation to yield ammonium phosphate granules; drying and sieving the ammonium phosphate granules, thereby yielding ammonium phosphate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.