Compositions: coating or plastic – Coating or plastic compositions – Molds and mold coating compositions
Patent
1997-05-07
1998-06-23
Marcheschi, Michael
Compositions: coating or plastic
Coating or plastic compositions
Molds and mold coating compositions
106 3828, 106 3822, 106 3827, 106 389, 502413, 502416, 164 47, 164138, 95141, B22C 100, B22C 900, B22C 902
Patent
active
057699330
ABSTRACT:
An activated carbon and/or activated graphite foundry sand additive, and method of casting molten metal against a foundry sand containing the additive composition. In another embodiment, the activated carbon and/or activated graphite additive (or portion thereof) is formed in-situ by adding to the foundry sand a humic acid-containing and/or a humic acid salt-containing ore (hereinafter referred to separately or in combination as "humic-containing ore") and low VOC-containing (<1 mg/g at 1800.degree. F.) carbon or graphite or admixtures of low VOC-containing carbon and graphite. The combination of low VOC-containing carbon and/or graphite and the humic-containing ore react in-situ when the foundry sand is heated by contact with molten metal, at temperatures of about 450.degree. F. to about 2300.degree. F., particularly in the range of about 600.degree. F. to about 2000.degree. F., to activate the carbon and/or graphite. The carbon and/or graphite, activated in-situ during the molding process, absorb and/or adsorb (sorb) gaseous volatile organic compounds (VOCs) within the mold, so that the VOC gases are held by the in-situ activated carbon and/or graphite to satisfy VOC emissions requirements.
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Amcol International Corporation
Marcheschi Michael
LandOfFree
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