Compound, method for stabilizing shwertmannite, method for clarifying polluted water or polluted soil, and method for adsorbing phosphoric acid
US7455477B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 3, 2004 |
| Grant date | Nov 25, 2008 |
| Priority date | — |
| Expiry date | Jan 25, 2025 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC02F2101/103
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
A new compound represented by a composition formula Fe8O8 (OH)8-2x((SO4)a, (HPO4)b)x (a+b=x, 1≦x≦1.75, 0<a≦1.658, 0.092≦b≦x) formed by adding a shwertmannite of a composition formula Fe8O8(OH)8-2x(SO4)x (1≦x≦1.75) to a phosphoric acid solution of a pH value of 2-9 thereby achieving a stabilization by an adsorption of phosphoric acid, shows a very firm stabilization under conditions of 0<a≦1.253 and 0.497≦b≦x. The new compound has a high stability, can maintain a high adsorbing ability for arsenic and the like and a cleaning level for a necessary period or semi-permanently, and can adsorb arsenic and the like in polluted water or polluted soil.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.