Hydrotalcite like substance, process for producing the same and method of immobilizing hazardous substance
US9216310B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Oct 11, 2013 |
| Grant date | Dec 22, 2015 |
| Priority date | — |
| Expiry date | Jan 11, 2034 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01P2004/64
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A hydrotalcite-like substance capable of ion exchange with target anions, being of small crystal size that exhibits large basal spacing and excels at anion exchange performance; a process for producing the same; and a method of immobilizing hazardous substances. The hydrotalcite-like substance is produced by mixing an acidic solution containing aluminum and magnesium ions with an alkaline solution containing an alkali to synthesize a hydrotalcite-like substance, followed by, without ageing, water removal or neutralization. The molar ratio of aluminum ions and magnesium ions is preferably in the range of 1:5 to 1:2. Hazardous substances can be immobilized by pulverizing the hydrotalcite-like substance after synthesis and adding the powder to a subject, or adding a hydrotalcite-like substance in slurry form to a subject, or carrying out addition so as to cause the synthesis directly at the position of the subject. Furthermore, anion adsorption can be performed by a filter containing the hydrotalcite-like substance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.