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This work aimed to study the formation of metal accretions (skulls) on the basic oxygen furnace (BOF) converter lance. A systematic collection of lance skulls was achieved. The chemical composition and structural analysis of the samples allowed classification into two groups : small skulls and large skulls. The second part of the work involved simulating the initial contact of a liquid metal drop on the lance. A maximum speed of the liquid metal droplets for adhering to the lance has been highlighted. Trials with different coatings have also been performed. It has been found that the most appropriate product is a coating made of grey alumina. A statistical analysis of the operating conditions leading to the skull formation has been achieved. The first relevant parameter underlined by this analysis is the height of the lance during the first minutes of the blow probably through its action on the droplet speed. The second parameter is the metal bath temperature just after the completion of all the inputs. Practical actions have been derived, especially an enhanced control of the lance practice during the first minutes of the blow. A drastic reduction of the skull formation has been noticed.

Additional information

Authors: MARIQUE C, Centre de recherches métallurgiques, Liège (BE);NYSSEN P, Centre de recherches métallurgiques, Liège (BE)
Bibliographic Reference: EUR 15504 FR (1996) 32pp., FS, ECU 7
Availability: Available from the (2)
ISBN: ISBN 92-827-5785-4
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