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2038703 
Book/Book Chapter 
OPTIMISED RE-MELTING BY THE USE OF LOW TEMPERATURE OXYFUEL AT HYDRO ALUMINIUM'S PRIMARY ALUMINIUM CASTHOUSE, OVRE ARDAL, NORWAY 
Gripenberg, H; Lodin, J; Torvanger, Ken 
2010 
LIGHT METALS 
685-690 
WOS:000279745600112 
Hydro Aluminium Ardal produces primary foundry alloys of mainly AA4000 series. The capacity is 130 000 tonne per year. The lour furnaces at the cast house are charged with a mix of pot-room metal and commodity metal. In 2007 the Soderberg pot-room was closed and the re-melting of solid metal had to be increased by 60% to keep up the production from the cast house. This meant that the fraction of solid metal in the casting furnace batch had to be increased. The goal had to be reached using the same furnaces and casting equipment. Therefore the furnaces were converted from air-fuel to Low-temperature Oxyfuel burners from Linde. The paper will discuss how the melting process was optimized. Further how the energy efficiency depends on the fraction of solid metal in the batch and results of productivity, dross, and economy. The Low-temperature Oxyfuel technology will be described. 
oxygen; burner; oxy-fuel; melting; aluminum; emissions; NO(x)