Registration Dossier
Registration Dossier
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EC number: 270-659-9 | CAS number: 68475-76-3 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@Ca(OH)2@Feldspars@CaSO4@Fly ash@KCl@Iron oxides@K2CO3@CaF2@K2SO4@CaO@Na2SO4@Glasses of SiO2, Al.s@Portland cement chemicals [659
Water solubility
Administrative data
Link to relevant study record(s)
Description of key information
No representative value available.
Key value for chemical safety assessment
Additional information
The testing methods are not applicable, due to the following reasons:
1. Flue dust is a complex inorganic substance (UVC). The solubility properties of the substance can differ substantially from what is observed for each individual constituent of the substance. In addition, the substance is heterogeneous in size and composition on a microscopic/macroscopic scale. Therefore, a representative result is hardly achievable, especially when small amounts of the substance are weighed out (ECHA Guidance on information requirements and chemical safety assessment Chapter R.7a: Endpoint specific guidance, page 94).
2. Some main constituents of the substance (cement clinker phases) react with water and form water stable, highly insoluble hydration products. These stable products are well known from the intended reaction of cement with water. This water-insolubility of the hydration products is the reason why concrete can be used for construction in and under water.
Some other constituents are moderately and some are highly water soluble. Due to the broad range of these constituents, no definite solubility can be given for Flue dust.
Solubility data for some soluble constituents at 20 °C (from chemical data bases /handbooks):
Calcium carbonate 0.014 g/L
Dolomite 0.08 g/L
Calcium sulfate 2.0 g/L
Calcium oxide 1.4 g/L
Magnesium oxide 0.09 g/L
Potassium chloride 330 g/L
Sodium chloride 358 g/L
Potassium sulfate 110 g/L
Potassium sodium sulfate 280 g/L
Potassium calcium sulfate 2.5 g/L
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