Method and apparatus for calcining raw phosphate material
US4555388A · kind A · utility
14Cited by
3References
6Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 5, 1983 |
| Grant date | Nov 26, 1985 |
| Priority date | — |
| Expiry date | Dec 5, 2003 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S423/16
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Raw phosphate material is calcined to remove pollutants, such as organic compounds and sulphides, by heat treatment in two suspension calciners (3,5) arranged in series. Fuel supplied at burners (8) is burnt in the calciners with air, supplied in parallel through pipes (9) from a cooler (7) for the treated material. The material is preheated in a preheater, for instance a pipe (13) and cyclone (2) by exit gases from the calciner before entering the calciners and, after leaving the calciners, is separated from the gas streams in separators (4,6).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.