Method of producing cement or concrete
US4985081A · kind A · utility
1Cited by
2References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 28, 1990 |
| Grant date | Jan 15, 1991 |
| Priority date | — |
| Expiry date | Feb 28, 2010 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02W30/91
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A method of producing cement or concrete, comprising the step of adding fly ash to the cement or concrete at the production stage, the fly ash containing lime and reaction products from the reaction occurring between lime and sulphur oxides in connection with the desulphuration of flue gases. To avoid the disadvantageous effects of calcium sulphite and entringite reactions and to increase the used amount of fly ash containing desulphuration waste, the calcium sulphite is oxidized by hydrogen peroxide either before the production of cement or concrete or during the production.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.