Method for the reduction of SO.sub.2 emissions as generated by the fluid bed cement process
US5556459A · kind A · utility
Inventors
Key dates
| Filing date | Jun 8, 1995 |
| Grant date | Sep 17, 1996 |
| Priority date | — |
| Expiry date | Jun 8, 2015 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B2111/80
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
With the present invention, a feed preparation system for producing cement includes mixing raw materials with a source of potassium. The mixture is conveyed to feed preparation system where it is placed in condition for treatment in a fluidized bed reactor for thermal processing to produce cement clinker. The potassium combines with the SO.sub.2 generated in the process to form potassium sulfate solids that are filtered from the process gas stream before emission to the atmosphere to thereby reduce sulfur emissions from the fluid bed cement process. The starting material may include white cement raw meal, grey cement raw meal and cement kiln dusts.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.