Efficiency of different kinds of aluminium during deoxidation at the Steelworks of ISD Dunaferr Co. Ltd.

Abstract

In all areas of life, cost-effectiveness is increasingly emphasized. It is true for materials used in metallurgical processes too. In many cases, however, not only the composition of the materials used affects the efficiency, but also their consistency. The use of various Al carrier alloys used for deoxidation during converter steel production differs due to different degrees of burns. In this article we will compare the utilization of cast (solid) “mokka” aluminium and the loose waste “shredder” aluminium used in ISD DunaferrZrt. Steel Works during the deoxidation process and the economics of the use of two deoxidation aluminiums.The experiment involved a total of 67 heats. Taking into account the results of the statistical analysis, 3 heats were excluded from the heats deoxidized with “mokka” aluminium. The calculations related to the experiment were performed on the basis of 35 heats deoxidized with “mokka” aluminium and 29 heats pre-deoxidized with “shredder” aluminium. In the calculation of aluminium utilization it can be observed that the “mokka” aluminium is ∼ 2.3% better utilized in comparison to the „shredder” aluminium and it can be observed also based on the total amount of aluminium delivered during the whole production process, that the total aluminium utilization is ∼ 3.7% better for heats where pre-deoxidation was made with “mokka” aluminium.On the basis of economical calculations it can be stated that the use of “shredder” aluminium is only economical, if its price per tonne does not exceed ∼ 80% of the price of “mokka” aluminium.