Method for making moisture resistant calcium-containing particles
US5997601A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 8, 1999 |
| Grant date | Dec 7, 1999 |
| Priority date | — |
| Expiry date | Jan 8, 2019 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC05D3/00
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A method of making free-flowing moisture resistant calcium-containing particles that inhibit the water absorption characteristics of calcium products, hygroscopic and deliquescent, for example, the method comprising the steps of spraying molten soluble nitrogen-containing material onto the hygroscopic calcium-containing granules and recovering the coated granules. The core of the particle is a calcium-containing material, more particularly a soluble calcium-containing material. Moisture resistant or hydrophobic coatings are applied to the core to inhibit water absorption by the calcium-containing material. The coated particles may then be more easily shipped, stored and handled as a dry, anhydrous product. A core comprised of calcium chloride coated with urea is useful as both a soil conditioner and a fertilizer. Additional plant nutrients are mixed with either the core or the coating materials to improve fertilizing is qualities. Additional coatings of hydrophobic materials such as a paraffinic hydrocarbon or a polymeric resin increase the water resistance of the particles. A final coating of a finely divided conditioning agents such as talc or calcium carbonate can be applied to …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.