Method and apparatus for producing high-strength grannular particulates from low-strength prills
US4842790A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 31, 1988 |
| Grant date | Jun 27, 1989 |
| Priority date | — |
| Expiry date | Mar 31, 2008 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC05G5/12
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
The present invention teaches a technique and provides for apparatus eminently useful for producing closely sized, high-strength granular particulates from low-strength prills such as, for example, urea and ammoniu m nitrate which are nitrogen fertilizers, i.e., an essential plant nutrient. Advantages and benefits derived from the practice of the present invention relate to the production of closely sized high-strength particulates useful to the chemical fertilizer industry by virtue of their having favorable properties for custom fertilizer blending, direct applications, and as a substrate for sulfur coating to produce a controlled release fertilizer. Further advantages and benefits derived from the practice of the present invention relate to the utilization of low-cost surplus prills of low stren gth as feedstock in the production of the closely sized, high-strength granu lar particulates. Accordingly, the instant granulation process requires considerably less energy input than prior art granulation processes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.