Process for thermal and pneumatic treatment of granular solids
US4569696A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 10, 1984 |
| Grant date | Feb 11, 1986 |
| Priority date | — |
| Expiry date | Aug 10, 2004 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S241/10
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Granular solids are thermally and pneumatically treated 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.