Treatment of municipal waste ash
US5387739A · kind A · utility
6Cited by
7References
8Claims
0Family size
Inventor
Key dates
| Filing date | Apr 28, 1992 |
| Grant date | Feb 7, 1995 |
| Priority date | — |
| Expiry date | Apr 28, 2012 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02W30/91
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
Ash obtained from incineration of municipal waste is mixed with small quantities of water, from 10-35% by weight of the ash, and the product so formed is compacted and extruded. Where required, sufficient lime is added to raise the pH of the product from about 7.4 to about 11.6. The lime can be combined with a product containing silica and/or alumina. The solid products obtained are virtually insoluble in water and are substantially non-polluting.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.