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Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.3/220528
- Pyrometallurgical treatment of wastes: an Australian contribution
- Brooks, Geoffrey A.; Worner, H. K.
- A primary metal producer who produces large quantities of wastes can either stabilise recycle or attempt to recover value from its various waste streams. Recovering value from 'wastes' depends greatly on the physical and chemical characteristics of the these materials, and is likely to require novel and innovative technological approaches. These challenges have led some Australian pyrometallurgists, at the University of Wollongong to develop the EnvIRONment process to treat steel works dust and organic wastes simultaneously. The original concept was to achieve the smelting of fenuginous dusts and organic wastes in a pneumatic furnace with oxygen or oxygen enriched air but after preliminary experiments it was decided that better control of bath conditions and lower gas volumes would be achieved in an electric furnace. The process as it has been developed utilises a pelletised feed that is fed into a special D.C. electric furnace, the pellets becoming immersed in a molten slag above a carbon saturated iron bath. The iron oxide in the pellets is reduced and carburised whilst the organics are broken down to carbon monoxide, carbon dioxide, hydrogen and water vapour. Volatile metals are vapourised and collected in the bagbouse. Fundamental studies of the pellet 'dissolution' suggest that Fe2O3 and Fe3O4 present in the dusts reduce to FeO in less than a minute, depending on pellet characteristics and slag conditions, after which the pellet disintegrates. Trials carried out in a 100 kg D.C. electric arc furnace has allowed key process factors, such as composition of the pellets, the slag chemistry and furnace conditions to be addressed for a wide range of feed materials.
- Publication type
- Conference paper
- Proceedings of the 'Pyrometalluurgy '95' Conference, Cambridge, United Kingdom, 10-12 July 1995, pp. 235-242
- Publication year
- Electric arc furnace; Process development; Waste recovery; Waste treatment
- The Institution of Mining and Metallurgy
- 9781870706292, 1870706293
- Publisher URL
- Copyright © 1995.
- Peer reviewed