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Nitrogen-containing compounds in foundry mold emissions.

M B Emory, P A Goodman, R H James

    American Industrial Hygiene Association Journal
    |July 1, 1978
    PubMed
    Summary
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    Foundry sand binders release nitrogen compounds like ammonia and hydrogen cyanide during decomposition. Monitoring emissions and using adequate ventilation or nitrogen-free binders are key control strategies.

    Area of Science:

    • Industrial Chemistry
    • Environmental Science
    • Occupational Health

    Background:

    • Foundry sand binders are crucial in metal casting.
    • Decomposition of organic binders can release hazardous nitrogen compounds.
    • Understanding these emissions is vital for worker safety and environmental protection.

    Purpose of the Study:

    • To identify and quantify nitrogen compounds in foundry mold emissions.
    • To investigate the relationship between binder nitrogen content and emission concentrations.
    • To propose control strategies for mitigating hazardous emissions.

    Main Methods:

    • Analysis of decomposition products from commonly used foundry sand binders.
    • Identification of specific nitrogen compounds including nitrogen oxides, hydrogen cyanide, ammonia, aromatic amines, and isocyanates.

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  • Measurement of emission concentrations and comparison with binder nitrogen content.

    • Main Results:

    • Several nitrogen compounds were identified in decomposition products.
    • Emission concentrations were not directly correlated with the nitrogen content of the binders.
    • Measurable concentrations of hazardous compounds were detected, necessitating monitoring.

    Conclusions:

    • Foundry sand binders can emit hazardous nitrogen compounds.
    • Periodic monitoring of foundry emissions is essential.
    • Ventilation and the use of nitrogen-free binders are effective control strategies.