Products for the manufacture of molds and cores used in metal casting and a method for their manufacture and recycle from crushed rock
US6691765B2 · kind B2 · utility
6Cited by
47References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 7, 2001 |
| Grant date | Feb 17, 2004 |
| Priority date | — |
| Expiry date | Aug 19, 2021 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB22C5/06
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A system and method for producing foundry quality sand from non-conventional starting materials through the combination of oolitization and classification. Incoming particulate matter is first directed into a controlled energy attrition unit where the particles are made to collide with one another. Such collisions clean and round the particles by chipping away surface projections and coatings without crushing the particles. The particle stream is then directed through a multi-fraction classifier where it is separated into two or more useable grades of foundry sand. An air classifier is preferred for the classification stage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.