Effect of coal properties, injection rate and O2 addition on BF conditions

A test with different coal grades, injection rates and methods for oxygen addition has been performed in the LKAB experimental BF (EBF). The EBF test results are compared with results achieved at BF No. 3 at SSAB Tunnplåt in Luleå. The BF conditions have been studied by evaluation of process data, vertical temperature measurements and under-burden probe data in terms of temperature and gas composition. The generation of fines has been studied in samples taken out by solid sampling in the shaft and in samples of BF flue dust and sludge. The samples have been analysed by tumbler tests, chemical analyses, XRD and light microscopy. The type of PC used turned out to have a great effect on the consumption of reducing agents as well as on the dust generation. Effects seen on the BF gas composition and alkali behaviour that affected the raw material behaviour could be seen when the low volatile coal was changed into a high volatile coal. The vertical temperature profile was greatly influenced by the PCR, which also had an effect on the dust generation.

Ingår i:4th International Congress on the Science and Technology of Ironmarking, ICSTI 2006, Proceedings, s. 327-330

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