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Final report on Contract No 7210-PR/071, 1 July 1998 to 30 June 2001

Control of chemistry is a major concern in blast furnace operations, in particular sulphur and alkali control in which slag plays a major role. Normally, the final slag composition is controlled with burden materials charged at the furnace top to neutralise the acid slag of the coke. This basic feeding leads to highly basic slag between the melting zone and the tuyère level where most of the coke is converted and the acid coke ash is released. This can cause problems of control of blast furnace regularity.

Modelling of the fluid dynamics of the solid injectants has led to a recommendation for the geometry of the lance arrangement within the tuyère for achieving a maximum residence time of the injectants within the raceway zone to react with the molten material. The thermochemical slag metal model calculations have shown quite good results for the important desulphurisation of the hot metal (HM). The prediction of the silicon content of the hot metal by those model calculations does not fit as well. Injection trials have shown a somewhat better sulphur distribution between slag and hot metal when using MgO-C refractory fires. Although the injection of ground HM desulphurisation slag leads to a raised input, the desulphurisation of the HM is increased more. Injection of titanium oxide into the hearth results in increased Ti distribution between HM and slag.

Additional information

Authors: BUCHWALDER J, EKO Stahl, Eisenhüttenstadt (DE);HARP G, BFI VDEh, Düsseldorf (DE);WEINBERG M, BFI VDEh, Düsseldorf (DE);BÜRGLER T, Voestalpine Stahl, Linz (AT);DE SANTIS M, CSM, Rome (IT);GIOVANNI C, CSM, Rome (IT);LIBERATI L, CSM, Rome (IT)
Bibliographic Reference: EUR 20472 EN (2002), pp.95. Euro: 14.50
Availability: EUR-OP reference: KI-NA-20472-EN-S Available from EUR-OP sales agents. URL:
ISBN: ISBN: 92-894-4278-6
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