期刊
ISIJ INTERNATIONAL
卷 56, 期 11, 页码 1938-1947出版社
IRON STEEL INST JAPAN KEIDANREN KAIKAN
DOI: 10.2355/isijinternational.ISIJINT-2016-234
关键词
high chromium vanadium-titanium magnetite; pellet; Cr2O3; reduction mechanism; smelting mechanism
资金
- National Natural Science Foundation of China [51090384]
- 863 Program [2012AA062304]
- Fundamental Research Funds for the Central Universities [N150203003, N150202001]
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 degrees 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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