Surface-reacted calcium carbonate and its use in waste water treatment
US9745212B2 · kind B2 · utility
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21References
20Claims
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Key dates
| Filing date | Apr 1, 2014 |
| Grant date | Aug 29, 2017 |
| Priority date | — |
| Expiry date | Nov 10, 2034 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/2982
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
The present invention relates to a process for the purification of water, wherein a surface-reacted natural calcium carbonate is brought into contact with the water to be purified, the surface-reacted natural calcium carbonate being the reaction product of a natural calcium carbonate with an acid and carbon dioxide, which is formed in situ by the acid treatment and/or supplied externally.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.