Process and device for reclaiming used foundry sands
US5045090A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 22, 1989 |
| Grant date | Sep 3, 1991 |
| Priority date | — |
| Expiry date | May 22, 2009 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S241/10
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
The invention relates to a process and a device for reclaiming used foundry sands. In the process according to the invention the used sands are free from carbon-containing materials in a first step by means of a thermal treatment, inasmuch as they contain organic, carbon-containing material, and are subsequently mechanically cleaned batch-wise, for which purpose wear-resistant friction elements are moved through the sand charge as a function of the degree of oolitization of the respective sand batch at such a speed that the said grain of the batch is not destroyed. The device according to the invention consists of a cylindrical housing, in which rotatingly driven friction elements are provided, means for the batch-wise filling of the receptacle with used sand and means for discharge cleaned sand from the receptacle being provided. The drive of the friction elements is effected as a function of the degree of oolitization of the used sand and in such fashion that the quartz grain of the sand batch is not destroyted.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.