Abrasive tool making process – material – or composition – With carbohydrate or reaction product thereof
Patent
1989-05-22
1991-09-03
Rachuba, M.
Abrasive tool making process, material, or composition
With carbohydrate or reaction product thereof
241 57, 241DIG10, 134 2, B24B 1500
Patent
active
050450905
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.
REFERENCES:
patent: 4144088 (1979-03-01), Adams
patent: 4205796 (1980-06-01), Evans
patent: 4811909 (1989-03-01), Inoki
Pohl Giesserreitechnik
Rachuba M.
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