Apparatus for thermal and pneumatic treatment of granular solids
US4636168A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 7, 1985 |
| Grant date | Jan 13, 1987 |
| Priority date | — |
| Expiry date | Nov 7, 2005 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB22C5/18
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
An apparatus for thermally and pneumatically treating granular solids to remove organic and inorganic chemical additives which are bonded to the granular solids or in admixture with them, to provide a purified granular solid product which is suitable for reuse, for example foundry sand for use in high strength molded cores, or for other productive uses, such as landfill. Granular solid feed material is preheated in a dilute phase zone of a fluidized bed, organic chemical additives are thermally oxidized in a dense phase zone of the fluidized bed, and remaining inorganic chemical additives are separated and removed from the granular solids in a contiguous pneumatic impaction zone. The purified granular solids are removed from the pneumatic impaction zone and organic and inorganic materials are elutriated from the fluidized bed and removed from the head space.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.