Anhydrite binder and method
US4151000A · kind A · utility
3Cited by
1References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 30, 1978 |
| Grant date | Apr 24, 1979 |
| Priority date | — |
| Expiry date | Mar 30, 1998 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01P2006/14
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
The present invention relates to an anhydrite binder and to the method of making the same from the gypsum by-product (phosphogypsum) resulting from the production of phosphoric acid by the wet method, said binder comprising particulate anhydrous CaSO.sub.4 with an insoluble CaSO.sub.4 content of at least 93%, an average particle size diameter of 5 to 30, with 15% by weight or more of the particles having a diameter smaller than 10.mu. and 20% by weight or more of the particles having a diameter larger than 20.mu., and a pore volume of less than 0.29cc/g in the case of pores having a radius less than about 6.6.mu..
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.