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Substance Name: Flue dust, portland cement
RN: 68475-76-3


  • TSCA Definition 2018: A complex combination of finely divided inorganic particles separated from the exit gases formed during the manufacture of Portland cement. The flue dust consists of uncalcined raw materials along with partially calcined materials. Some Portland cement clinker is usually included. The major constituents of kiln dust are calcium carbonate, clays, shales, quartz and sulfate salts. The following materials may also be present:: Dolomite; Feldspars; Fly ash; Iron oxides; CaF2; CaO; Glasses of SiO2, Al2O3 and Fe2O3; Ca(OH)2; CaSO4; KCl; K2CO3; K2SO4; Na2SO4; Portland cement chemicals (65997-15-1*)

Molecular Formula

  • Unspecified

Classification Code

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Links to Resources

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Names and Synonyms


  • EC 270-659-9
  • EINECS 270-659-9
  • Kiln dust
  • Kiln flue dust, portland cement type I

Systematic Name

  • Flue dust, portland cement

Registry Numbers

CAS Registry Number

  • 68475-76-3

System Generated Number

  • 0068475763