Registration Dossier
Registration Dossier
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EC number: 273-925-2 | CAS number: 69227-11-8 A scum formed on the surface of molten copper.
Endpoint summary
Administrative data
Description of key information
‘Lead dross copper rich’ is a grey/black odourless solid (at 20°C and 101.3 kPa) in powder form. The density will vary according to the precise composition of the sample. The density of the tested sample was 8.14 g/cm3. In the melting point test, the sample started to melt at 311 °C. Consequently, boiling point and vapour pressure cannot be determined. The water solubility test shows dissolution of some metal ions. Three samples were tested for granulometry, a D50 = 56 µm, 99 µm and 200 µm were determined. However, both the results of the water solubility test and the granulometry test should be used with caution.
There is no evidence of physical hazards in terms of (auto) flammability, explosivity and oxidising properties.
Studies regarding flash point, partition coefficient, surface tension, dissociation constant, stability in organic solvents, and viscosity do not need to be conducted.
Waivers are in place for all these endpoints.
Additional information
'Lead-dross, copper-rich' is a solid at 20°C and 101.3 kPa produced by chemical reactions during the cooling of molten lead bullion to temperatures in the range >330°C - 450°C. Sulphur may be added if the input feed is deficient but is not always required. The resultant sulphidic precipitate formed on the surface is removed by skimming. 'Lead, dross, copper-rich' is composed primarily of metallic lead, lead sulphides and copper sulphides.
Note: Substances pre-registered under the EC numbers 305-408-5 and 273-925-2 were merged as a result of sameness discussions within the relevant SIEFs. They are collectively identified under the name 'Lead, dross, copper rich' and the EC number 273-925-2.
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