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Chemical and toxicological properties of coal fly ash - University of ...

Chemical and toxicological properties of coal fly ash - University of ...

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Table 6. Trace constituent concentrations (rnglkg) in the 12 <strong>fly</strong> <strong>ash</strong>es.Fly <strong>ash</strong>Constituent I1 I2 I3 I4 I5 I6 I7 I8 19 W 1 N2 W3ly <strong>ash</strong> classif icatisnsThe 12 <strong>fly</strong> <strong>ash</strong>es were classified by a system developed by Roy et al.(1981) <strong>and</strong> Roy <strong>and</strong> Griffin (1982). This system is based on the chemicalcomposition <strong>of</strong> the solid waste <strong>and</strong> the pH <strong>of</strong> an askdistilled water mixture(I:) Seven <strong>of</strong> the nine Illinois Basin <strong>fly</strong> <strong>ash</strong>es were alkaline Modicsilts (Fig. 4). Fly <strong>ash</strong>es fitting into the Modic field have a sialiccornponent (% weight <strong>of</strong> Si02 + A1 203 + TiOz), which indicates that theseelements consist <strong>of</strong> a combination <strong>of</strong> from >48% to 88% <strong>of</strong> the total mass.The ferric cornponent (% weight <strong>of</strong> Fez03 + S03) is from 0 to 23%, <strong>and</strong> theCalcic component (CaO + MgO + Na?O + K20) is from 0 to 29%. These seven

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