Cement waste product as scrubbing medium for sulfur oxides
US4276272A · kind A · utility
10Cited by
3References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 17, 1980 |
| Grant date | Jun 30, 1981 |
| Priority date | — |
| Expiry date | Mar 17, 2000 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D53/507
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Cement waste product (CWP), such as recovered from kilns utilized in cement production, is used for scrubbing of sulfur oxide-containing industrial offgases. The CWP is preconditioned with liquid water prior to employing it as a scrubbing medium. Preconditioning involves addition of sufficient water to the essentially anhydrous CWP to achieve essentially total rehydration of the rehydratable calcium compounds contained in the CWP, for example, aluminates, oxide and sulfates. The preconditioned CWP is dried and used as a highly efficient scrubbing medium for sulfur oxides.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.