Foundry sands derived from serpentine and foundry molds derived therefrom
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United States of America Patent
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-
Aug 5, 1986
Grant Date -
N/A
app pub date -
Apr 26, 1984
filing date -
Apr 26, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
There is disclosed a granular product suitable for use as foundry sands and obtained from asbestos tailings calcined at a temperature of from 1250.degree. to 1450.degree. C., said asbestos tailings having an MgO:SiO.sub.2 ratio greater than 1.0, the granules constituting the granular product being characterized by having a thermal expansion at 1000.degree. C. of not more than 1.0% and a particle size of between -20 to +200 mesh (Tyler), the granules being further characterized by being made up mainly of particles of enstatite bonded by gruenerite and fayalite, and substantially unreactive to basic oxides present in the cast metal.
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