Process for reducing phosphate ore
US4351809A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 20, 1981 |
| Grant date | Sep 28, 1982 |
| Priority date | — |
| Expiry date | May 20, 2001 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01B25/20
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A process for reducing phosphate ore includes beneficiating phosphate ore to reduce alumina impurities while allowing fluoride impurities to remain in the beneficiated ore, mixing beneficiated ore with solid carbonaceous material to form a porous bed of agglomerated feed and heating the porous bed in a rotary-type kiln to produce elemental phosphorus and carbon monoxide. The elemental phosphorus may be burned within the kiln to provide heat to the porous bed and an inert gas may be purged through the porous bed to drive the reaction between the phosphate ore and the solid carbonaceous material towards complete reduction of the phosphate ore by removal of carbon monoxide from the porous bed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.