Process for coating granular fertilizers with chelated micronutrients
US3961932A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 22, 1974 |
| Grant date | Jun 8, 1976 |
| Priority date | — |
| Expiry date | Jul 22, 1994 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC05G3/20
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A process for uniformly coating granular fertilizer formulations with one or more chelated metallic micronutrients which comprises the following steps: blending a granular fertilizer formulation in, for instance, a rotary drum mixer; spraying, while the blending continues 1 to 5% by weight of an aqueous solution or slurry containing one or more chelated metallic micronutrients, as for example, Na.sub.2 Zn EDTA, onto said fertilizer formulation; and adding, before or after said spraying, and while the blending continues 1 to 4% by weight of a finely divided water-absorbent additive, such as, a synthetic calcium silicate or finely divided silica, to the fertilizer formulation. The finished fertilizer formulation then contains 0.05 to 0.5% by weight of micronutrient.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.