smelting of Secondary Aluminium (UK)
CASE STUDY 5. Filtration for induction smelting of aluminium scrap
Coleshill Aluminium Ltd purchased their first ceramic filter from Glosfume in 1994. Since then, we've developed a close working relationship and over the past 18 years, Coleshill have purchased four filter units, most recently in 2005.
During induction smelting, contaminated aluminium scrap is converted into ingots and the volatile elements are filtered. Unlike oil-fired furnaces, no secondary combustion is available, this means that filtration has to be achieved by injecting and recirculation of 2C talc.
Because of the high temperatures involved and the presence of sparks/smouldering material in the gas being filtered, a conventional bag filter system would have failed within weeks of installation - almost certainly a considerable cost to the business. Instead, by understanding the special challenges of aluminium scrap smelting and designing a suitable ceramic filter system, we were able to contribute to the reliability and long-term cost-effectiveness of the operation.
- Installation dates: 1994-1995, 2003, 2005
- Location: UK
- Filter unit: HTMC2 (400)
- Filtration area: 152 m2
- Operating temperature: Ambient to 600 °C
- Dry scrubbing: 2C talc
- Gas flow: Up to 12,000 Am3/hr
Element life between 2 to 4 years.