Process for reducing phosphate ore
US4389384A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 10, 1982 |
| Grant date | Jun 21, 1983 |
| Priority date | — |
| Expiry date | May 10, 2002 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01B25/12
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A process for producing phosphorus pentoxide from phosphorus ore includes formation of a feed with a phosphate ore, silica and solid carbonaceous material in amounts to produce a feed mixture having a CaO/SiO.sub.2 mole ratio of less than about 0.5. The feed mixture is formed into agglomerated feed particles and the particles are heated by exposure to radiation eminating from an oxidation zone to a temperature sufficient to reduce the phosphate by reaction from the solid carbonaceous material to form elemental phosphorus vapor without substantial melting of the agglomerated feed particles. Sufficient oxygen-containing gas is provided to cause oxidation of the elemental phosphorus vapor within the oxidation zone to produce phosphorus pentoxide.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.