By John A Taylor; John F Grandfield; A Prasad
Read Online or Download Aluminium cast house technology XI : selected, peer reviewed papers from the international conference, organised by the CAST CRC, on behalf of the aluminium industry : it was held from 13-16 September, 2009, on the Gold Coast, Queensland, Australia PDF
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Additional resources for Aluminium cast house technology XI : selected, peer reviewed papers from the international conference, organised by the CAST CRC, on behalf of the aluminium industry : it was held from 13-16 September, 2009, on the Gold Coast, Queensland, Australia
4. 0% for case 1. The higher dross amount for case 2 is due to the high magnesium content in the wrought alloys, the additional fluxing operations and the higher scrap remelting operations. See  for typical data. 5. e. a typical figure reported in the industry. 6. For Case 1 the furnace energy consumption is assumed to be 300MJ/tonne. This would be a reasonable typical figure for the industry  considering a 1% scrap return. 1 GJ/tonne. For Case 2 a higher figure of 500MJ/tonne is assumed because of the higher 7% scrap return and the longer residence in the furnaces due to alloying and fluxing operations.
A comparison between the original skim weight and the recovered aluminum weight gave the amount of oxide formed for a given exposed surface area for a given exposure interval, thus giving an oxidation rate. Various test conditions were used and the data collected and analysed to determine oxidation rate as a function of time. e. for a given exposure time, t) of the power law type (Equation 1), where a and b are fitting constants derived from the straight line obtained on a log-log plot of OOR versus t.
Polycarbonate face shields of 2 to 4mm thickness have been shown to offer good protection from molten metal splash. The more widespread usage of face shields in aluminium cast houses is expected over the coming years. Specialist Kevlar helmets with thick polycarbonate face shields designed for fire-fighters are in use in some cast houses, however the more simplistic design shown in the centre of figure 12 is by far more common. Figure 12. Range of available face shields: (polycarbonate after molten metal explosion; common polycarbonate face shield; Kevlar helmet with heavy duty polycarbonate face shield – Z fire brigade helmet/ shield).