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Effect of physical properties of slag on sulphur removal mechanism during ESR process
Author(s) -
Eissa Mamdouh,
EIMohammadi Alaa
Publication year - 1998
Publication title -
steel research
Language(s) - English
Resource type - Journals
eISSN - 1869-344X
pISSN - 0177-4832
DOI - 10.1002/srin.199805573
Subject(s) - slag (welding) , metallurgy , metal , sulfur , materials science , viscosity , chemistry , composite material
In this study, the effect of slag's physical properties on the desulphurization process in electroslag remelting (ESR) was investigated. Three different steel grades were used as consumable electrodes in ESR. Each steel was remelted under three slag compositions with different physical and chemical properties. The results obtained showed the efficiency of ESR in removal of up to 68 % of the sulphur contained in the metal. This pronounced effect of ESR on desulphurization is a result of slag/metal and gas/slag reactions. Although the greatest portion of sulphur is removed by gas/slag reaction which is enhanced by using a low viscosity slag, the metal/slag reaction represents the rate controlling step over all the desulphurization process. Slag/metal reaction occurring at the metal droplets/slag interface is the most effective and enhancing by relatively high slag viscosity and high CaO content in the slag. Slag composition (mass contents in %) of 70 CaF 2 , 15 CaO and 15 Al 2 O 3 has a good combination of chemical reactivity and physical properties for attaining the highest degree of desulphurization among the three investigated slags.