Process for recovering magnetite from fly ash
US4191336A · kind A · utility
Inventor
Key dates
| Filing date | Dec 11, 1978 |
| Grant date | Mar 4, 1980 |
| Priority date | — |
| Expiry date | Dec 11, 1998 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02W30/91
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
This invention relates to a process for recovering magnetite from fly ash. Fly ash containing magnetite is made into a slurry having 5% to 10% solids by weight and the slurry is then concentrated in a settling tank to a slurry having approximately 20% solids by weight. The concentrated slurry is delivered to a magnetic separator where the magnetite is separated from the remainder of the fly ash. The magnetite is then crushed in a pulverizer to a size so that 95% of the crushed magnetite will pass through a 325 mesh sieve. The crushed magnetite is then delivered to a second magnetite separator which is weaker than the first magnetic separator to separate the crushed magnetite from any impurities. The purified crushed magnetite is then dried and stored.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.