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The objective of the research was to analyse the physico-chemical aspects of silicon transfer in the blast furnace and to define the operating conditions promoting the production of consistent hot metal, with low and regular silicon content. A thermodynamic model of Si equilibrium slag and metal has been developed. It is shown that, at the tuyere level the equilibrium silicon content should be high, whereas under hearth conditions a potential desiliconisation capacity exists. The flow of liquids (metal and slag) in the hearth of the blast furnace has been investigated by radioactive tracer techniques. Results show that the hearth is far from a well mixed reactor, explaining thus the large chemical and thermal heterogeneities of liquids that are observed and that may affect hot metal quality. According to the present analysis, the oxygen potential and the availability of oxygen at slag metal interface appear as determinant parameters to control silicon transfer. This concept has led to industrial trials consisting of injection of pulverised iron oxides at the tuyeres of the blast furnace.

Additional information

Authors: STEILER J M, Institut de Recherches de la Sidérurgie Française, Saint-Germain-en-Laye (FR)
Bibliographic Reference: EUR 12103 FR (1989) MF, 148 pp., ECU 8, blow-up copy ECU 18.75
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