Sulphur-containing fertilizers and process for the preparation thereof
US8702834B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 29, 2010 |
| Grant date | Apr 22, 2014 |
| Priority date | — |
| Expiry date | Oct 24, 2030 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC05G5/12
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
According to the present invention, there is provided a process for the manufacture of sulphur-containing fertilizer compositions, said process comprising the steps of: a) providing a slurry of at least one phosphate-based fertilizer material selected from the group consisting of ammonium phosphates, ammonium phosphate based nitrogen-phosphorus-potassium (NPK) compounds, super phosphates and partially acidulated phosphate rocks; b} bringing said slurry into contact with at least one surfactant and elemental sulphur; and c) introducing the mixture obtained in step b) into a granulator unit in order to obtain granules of the fertilizer composition, wherein the elemental sulphur is present in an amount in the range of form 1 to 25 wt. %, based on the total weight of the fertilizer composition The present invention also provides a fertilizer composition.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.