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Reduction of ilmenite concentrates by methane-containing gas: Part I. Effects of ilmenite composition, temperature and gas composition

Journal Article


Abstract


  • Reduction of ilmenite concentrates by CH4-H2-Ar gas mixture was investigated in a laboratory fixed bed reactor in the temperature range of 850-1350°C. Three ilmenite concentrates with different concentrations of TiO2 (55.6-71.5wt%) and iron oxides (Fetotal 14.5-28.2wt%) were examined. In the temperature range under investigation, iron oxides in ilmenites were quickly reduced to metallic iron. Titanium oxycarbide was formed at temperatures of 950°C and above. Solid carbon was also formed as a result of methane cracking. The rate and extent of ilmenite reduction increased with increasing temperature from 950 to 1150-1200°C. A further increase in temperature caused a decrease in the final extent of reduction. An increase in methane content in reducing gas up to 8 vol% resulted in an increase in the rate of titanium oxycarbid formation, but reduction extend decreased. An increase in hydrogen content increased both the rate and extent of reduction.

Publication Date


  • 2001

Citation


  • Zhang, G., & Ostrovski, O. (2001). Reduction of ilmenite concentrates by methane-containing gas: Part I. Effects of ilmenite composition, temperature and gas composition. Canadian Metallurgical Quarterly, 40(3), 317-326. doi:10.1179/cmq.2001.40.3.317

Scopus Eid


  • 2-s2.0-0035388313

Start Page


  • 317

End Page


  • 326

Volume


  • 40

Issue


  • 3

Abstract


  • Reduction of ilmenite concentrates by CH4-H2-Ar gas mixture was investigated in a laboratory fixed bed reactor in the temperature range of 850-1350°C. Three ilmenite concentrates with different concentrations of TiO2 (55.6-71.5wt%) and iron oxides (Fetotal 14.5-28.2wt%) were examined. In the temperature range under investigation, iron oxides in ilmenites were quickly reduced to metallic iron. Titanium oxycarbide was formed at temperatures of 950°C and above. Solid carbon was also formed as a result of methane cracking. The rate and extent of ilmenite reduction increased with increasing temperature from 950 to 1150-1200°C. A further increase in temperature caused a decrease in the final extent of reduction. An increase in methane content in reducing gas up to 8 vol% resulted in an increase in the rate of titanium oxycarbid formation, but reduction extend decreased. An increase in hydrogen content increased both the rate and extent of reduction.

Publication Date


  • 2001

Citation


  • Zhang, G., & Ostrovski, O. (2001). Reduction of ilmenite concentrates by methane-containing gas: Part I. Effects of ilmenite composition, temperature and gas composition. Canadian Metallurgical Quarterly, 40(3), 317-326. doi:10.1179/cmq.2001.40.3.317

Scopus Eid


  • 2-s2.0-0035388313

Start Page


  • 317

End Page


  • 326

Volume


  • 40

Issue


  • 3