Effect of Cr2O3 on the Reduction and Smelting Mechanism of High-Chromium Vanadium-titanium Magnetite Pellets

• Published in: ISIJ International Vol. 56; no. 11; pp. 1938 - 1947
• Main Authors: Cheng, Gong-jin, Xue, Xiang-xin, Gao, Zi-xian, Jiang, Tao, Yang, He, Duan, Pei-ning
• Format: Journal Article
• Language: English
• Published: The Iron and Steel Institute of Japan 01.01.2016
• Subjects: Cr2O3; high chromium vanadium-titanium magnetite; pellet; reduction mechanism; smelting mechanism
• ISSN: 0915-1559; 1347-5460
• DOI: 10.2355/isijinternational.ISIJINT-2016-234

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.