Development of chemical methods for selective removal of trace elements from coal: Final report. [Trace element concentrations in raw and demineralized coal]

Technical Report · Mon Dec 01 04:00:00 EST 1986

OSTI ID:6916475

Norton, G A; Markuszewski, R; Araghi, H G

Various chemical treatments were found to be effective at reducing levels of many trace elements from selected coals. Leaching Illinois No. 6 coal with HNO/sub 3/ significantly reduced levels of Be, Mn, Ni, Pb, and Zn. Trace element reductions were generally less pronounced for Lower Kittanning coal leached with HNO/sub 3/, although As levels were reduced by 90%. Molten NaOH/KOH and hot aqueous Na/sub 2/CO/sub 3/ treatments followed by acid washes significantly reduced levels of many trace elements in Illinois No. 6 and Pittsburgh No. 8 coals. Treating run-of-mine Illinois No. 6 coal with aqueous Na/sub 2/CO/sub 3/ at elevated temperatures and pressures and subsequently washing the coal with acid reduced levels of Cd, Mn, Ni, Pb, and Zn by 50% or more. In one sample treated with hot aqueous Na/sub 2/CO/sub 3/, levels of Ba, Rb, and Sr were also reduced substantially. Coals which were treated with hot molten caustic at atmospheric pressure showed substantial reductions in concentrations of As, Cd, Hg, Pb, Rb, Se, Sr, and Zn. Several elements, such as Cr, Cu, and Ni, were elevated in some of the coals treated with caustic or alkali. This can be attributed to corrosion of reactor components. 47 refs., 15 tabs.

• Research Organization: Ames Lab., IA (USA)
• DOE Contract Number: W-7405-ENG-82
• OSTI ID: 6916475
• Report Number(s): IS-4915; ON: DE87004551
• Country of Publication: United States
• Language: English

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