Method of producing fertilizer granules containing urea and ammonium sulphate
US4943308A · kind A · utility
16Cited by
10References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 28, 1988 |
| Grant date | Jul 24, 1990 |
| Priority date | — |
| Expiry date | Dec 28, 2008 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC05C3/005
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
The invention concerns a method of producing fertilizer granules containing urea and ammonium sulphate by granulating a mixture containing urea, ammonium sulphate and water, which is characterized in that the ammonium sulphate is completely dissolved in an aqueous urea solution with a urea concentration of 70-85% by weight, the resulting solution is thickened to a dry content of 92-97% by weight, with a granulation additive for the urea being added in any stage of the treatment, following which the thickened solution is granulated in a fluidized bed of urea and ammonium sulphate containing nuclei.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.