Colloidal hydroxide aqueous suspension of at least one transition element serving to reduce chrome in cement
US7601328B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 6, 2004 |
| Grant date | Oct 13, 2009 |
| Priority date | — |
| Expiry date | Sep 23, 2024 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B2111/1081
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
The invention relates to a hydroxide aqueous suspension of at least one selected transition element of which the potential oxidation reduction is less than that of the pair CrO72−/CrO42− (−0.12 V) having a pH between 2 and 11, limits excluded, for reducing the content of chrome VI of cement to a value no greater than 2 ppm. The suspension is characterized in that it contains 0.5 to 80% by wt. of dry material of hydroxide of at least one transition element with regard to the quantity of water and in that it is stabilized by a hydrosoluble stabilizer. This suspension makes it possible to reduce the content of chrome VI of cements to a value no greater than 2 ppm.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.