ISIJ International
Online ISSN : 1347-5460
Print ISSN : 0915-1559
ISSN-L : 0915-1559
Regular Article
Effect of Flux Addition Method on Hot Metal Desulfurization by Mechanical Stirring Process
Yoshie NakaiYuta HinoIkuhiro SumiNaoki KikuchiYuichi UchidaYuji Miki
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2015 Volume 55 Issue 7 Pages 1398-1407

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Abstract

The effects of three flux addition methods on hot metal desulfurization with mechanical stirring were investigated in a 1/12-water model test and a 70 kg hot metal desulfurization test. The flux addition methods studied here were top addition on the bath surface in the first period of desulfurization (batch addition), continuous addition from the top, and powder blasting with nitrogen gas. The desulfurization rate when powder blasting is applied is larger than that of either continuous addition or batch addition. The obtained aggregated slag (desulfurization flux) particle diameters after desulfurization were 0.76 mm (batch addition) and 0.38–0.44 mm (powder blasting). Desulfurization behavior was analyzed assuming that the interfacial area between the flux and the hot metal is proportional to the estimated size of the aggregated slag. Based on this analysis, the effect of powder blasting with nitrogen gas on improvement of desulfurization efficiency was interpreted to be the combined result of a) promotion of flux dispersion and avoiding aggregation during flux addition and b) prevention of slag particle aggregation in the hot metal during stirring.

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© 2015 by The Iron and Steel Institute of Japan
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