Commercial sands contain different concentrations and ratios of carbonaceous materials and bentonite clays that a given facility uses to prepare their molding sands. Design of Experiment methodology was used in combination with Analysis of Variance (ANOVA) to show that carbonaceous additives seacoal and causticized lignite in the bentonite-based pre-blend are statistically significant factors in predicting emissions output as measured using pyrolyzer Gas Chromatography Mass Spectrometry (pyrolyzer/GC-MS) analytical methods. Hazardous Air Pollutants (HAPs) were measured in a laboratory setting. A model was generated from the results of the ANOVA to predict emissions of molding sands as a function of their seacoal and causticized lignite concentrations.
Liam Miller, American Colloid Co.
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