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  • Critical review of existing procedures for the characterisation of the metallurgical properties of blast furnace burden material at conditions of high injection rates


Disintegration behaviour, reducibility and melting properties are rated as the most important metallurgical quality data for the characterisation of the ferrous burden.

The currently used test procedures were developed at a time when blast furnaces were operated in full coke operation and may not adequately describe the metallurgical properties of the burden at conditions of high injection rates of coal or oil into the blast furnace.

Within the research work, disintegration, reduction and melting properties of simter, pellets and lump ore were tested according to various gas temperature programmes, developed by the partners, which take into account the conditions of high injection rates.

The test work showed that the disintegration behaviour, the reducibility and the melting properties can be characterised by using the newly developed programmes No 5. Althoug the absolute test results differ to the results of the tests according to the standardised ISO procedures, the ranking of results is identical. A comparison of the overall results shows that a differentiation of results is even better when ISO procedures are used for the tests. The ISO procedures have an additional advantage that these tests are much more effective with regard to repeatability and time needed for the testing.

Accordingly, it can be stated that the well-introduced and accepted ISO procedures can also be used to characterise the burden material at the nowadays common practice of high injection rates of coal or ail into the blast furnace.

Additional information

Authors: RITZ V, Studiengesellschaft fur Eisenerzaufbereitung (SGA), Liebenburg (DE);MULHEIMS K, ThyssenKrupp Stahl AG, Duisburg (DE);ROSENPLANTER R, ThyssenKrupp Stahl AG, Duisburg (DE);LECTARD E, IRSID, Maizieres-les-Metz (FR);BURGLER T, Voestalpine Stahl GmbH, Linz (AT)
Bibliographic Reference: EUR 20943 EN (2004), 153 pp. Euro: 25
Availability: EUR-OP reference: KI-NA-20943-EN-S Available from EUR-OP sales agents URL:
ISBN: ISBN: 92-894-7548-X
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