| 摘要 |
The present invention is directed to a foundry sand additive composition, and method of casting molten metal against a foundry sand containing the additive composition. The additive composition comprises a humic acid-containing and/or a humic acid salt-containing ore (hereinafter referred to separately or in combination as "humic-containing ore") and carbon or graphite or admixtures of carbon and graphite. The combination of 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 DEG F to about 2300 DEG F, particularly in the range of about 600 DEG F to about 2000 DEG 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. |
