The use of FBC wastes in the reclamation of coal slurry solids. Final technical report, September 1, 1991--August 31, 1992

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Five fluidized bed combustion (FBC) wastes, one agricultural limestone (Ag LS), and two coal slurry solids (CSS) samples were characterized chemically and mineralogically. Mixtures of the materials (FBC waste or Ag LS and CSS) were prepared and subjected to leaching with deionized water in laboratory experiments and with meteoric water in outdoor weathering experiments. The major cations in the leachates were calcium and sodium, with minor concentrations of magnesium and potassium. The major anions were chloride and sulfate, with minor amounts of fluoride and bicarbonate. The major minerals in the unleached FBC wastes were calcium oxide and calcium sulfate (anhydrite). … continued below

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32 p.

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Dreher, G. B.; Roy, W. R. & Steele, J. D. December 31, 1992.

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Five fluidized bed combustion (FBC) wastes, one agricultural limestone (Ag LS), and two coal slurry solids (CSS) samples were characterized chemically and mineralogically. Mixtures of the materials (FBC waste or Ag LS and CSS) were prepared and subjected to leaching with deionized water in laboratory experiments and with meteoric water in outdoor weathering experiments. The major cations in the leachates were calcium and sodium, with minor concentrations of magnesium and potassium. The major anions were chloride and sulfate, with minor amounts of fluoride and bicarbonate. The major minerals in the unleached FBC wastes were calcium oxide and calcium sulfate (anhydrite). The calcium oxide was hydrated upon wetting to calcium hydroxide, which was converted to calcium carbonate (calcite) upon exposure to atmospheric carbon dioxide, or carbon dioxide from the neutralization reaction of acid with calcite. The calcium hydroxide controlled the pH of leachates in the early leaching period, whereas calcite controlled the pH in the later leaching period. The alkaline calcium species in the FBC wastes effectively neutralized the acid generated by pyrite oxidation. In extracts generated by the Toxicity Characteristic Leaching Procedure (TCLP), selenium was found to be above the US EPA primary drinking water maximum contaminant level (MCL) in extracts from each of the FBC wastes and CSS samples. Mercury was above its MCL in the extract of FBC-2. The other six constituents (As, Ba, Cd, Cr, Pb, and Ag) were below their corresponding MCLS. Hence, these FBC wastes would not be classified as hazardous under the Resource Conservation and Recovery Act.

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32 p.

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OSTI as DE94005722; Paper copy available at OSTI: phone, 865-576-8401, or email, reports@adonis.osti.gov

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  • Other Information: PBD: [1992]

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  • December 31, 1992

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Thumbnail image of item number 1 in: 'The use of FBC wastes in the reclamation of coal slurry solids. Final technical report, September 1, 1991--August 31, 1992'.
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Dreher, G. B.; Roy, W. R. & Steele, J. D. The use of FBC wastes in the reclamation of coal slurry solids. Final technical report, September 1, 1991--August 31, 1992, report, December 31, 1992; Springfield, Illinois. (https://digital.library.unt.edu/ark:/67531/metadc1273233/: accessed April 24, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.

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