ISIJ International
Online ISSN : 1347-5460
Print ISSN : 0915-1559
ISSN-L : 0915-1559
Regular Article
Effect of Cr2O3 on the Reduction and Smelting Mechanism of High-Chromium Vanadium-titanium Magnetite Pellets
Gong-jin ChengXiang-xin XueZi-xian GaoTao JiangHe YangPei-ning Duan
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2016 Volume 56 Issue 11 Pages 1938-1947

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Abstract

Effect of Cr2O3 on the reduction mechanism of high-chromium vanadium-titanium pellets was firstly studied in the present paper. It is found that Cr2O3 has an obvious effect on the reduction of high chromium vanadium-titanium pellets. With increasing Cr2O3 content from 0.28% to 8.22%, the reduction extents increased slightly and then decreased, and the reduction mechanism was further elucidated by means of XRD and SEM-EDS. Effect of Cr2O3 on the smelting mechanism of high-chromium vanadium-titanium pellets was also studied in the present paper. With increasing Cr2O3 contents from 0.28% to 8.22%, the softening start temperature and the softening temperature gradually increased, and the softening zone increased as a whole. The melting start temperature increased as a whole. The dripping temperature gradually increased, the melting-dripping zone increased quickly to a relatively high value of above 230°C, and the permeability index increased evidently, indicating the deterioration of melting-dripping index. The dripping difficulty increasing with the increase of Cr2O3 contents is in accordance with the observed Cr-multicarbides and Cr-carbides in the XRD pattern and the microscopic examination of the not-dripped and dripped melted iron and slag.

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© 2016 by The Iron and Steel Institute of Japan
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