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In an integrated steel works the rolling mill process generates thick sludge. This is generally composed of iron oxides (calamine) formed at the surface of the metal and detached at the time of rolling, oil and grease used in the process, and water which is used to flush out previous products to avoid accumulation under the rolling mill casing. The mixture of three elements is treated and recycled to allow the water to be purified. As a result of this treatment thick sediment is produced containing approximately 5% of hydrocarbons. It is not possible to recycle this in the steelworks and it is stored in watertight basins. The Fos steel works, for example, produces 10-12kt each year. Due to increased regulation concerning the management of industrial waste and reduction in the steel works' storage capacity, research was carried out with the aim of finding a use for this sediment. Firstly, with the collaboration of LECES, research was carried out in the laboratory to test a process of cold compacting of sediment to produce pellets that could be treated to produce oxygen. The results were promising and it was decided to set up an industrial trial.

Additional information

Authors: GALIMANT P, Sollac Fos, Fos-sur-Mer Cedex (FR)
Bibliographic Reference: EUR 18782 FR (1999) 32pp.
Availability: Available from OOPEC Sales agents
ISBN: ISBN 92-828-5300-4
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