Method for the manufacture of a solid by the mixing of hydrates of alkaline earth oxides and hydrates of heavy metal oxides
US5599272A · kind A · utility
Inventor
Key dates
| Filing date | Nov 22, 1994 |
| Grant date | Feb 4, 1997 |
| Priority date | — |
| Expiry date | Nov 22, 2014 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC02F11/008
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
Disclosed is a method for the manufacture of a solid that is practically insoluble in water and non-pollutant. pollutant. This method comprises a step in which there are mixed, in an aqueous medium, at least two compounds in order to obtain a paste. According to this method, one of the compounds or first compound comprises hydrates of alkaline earth oxides and another compound or second compound comprises hydrates of heavy metal oxides; the free water contained in the paste or liquid is present in the liquid in a proportion, in terms of quantities, of 20% to 60% by weight of the total mixture; the solid obtained being substantially without silicates and aluminates. The disclosed method is applicable, in particular, to waste treatment and to the field of civil engineering and construction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.