The Kinetics Mechanisms of Hematite and Magnetite Containing Self-Reducing Briquettes
The present work, analyzes the impact of the key variables –temperature, reduction atmosphere and composition of the ferrous and carbonaceous materials –on the kinetics of self-reducing briquettes, for two types of samples, over the temperature range of 1000 to 1300℃. The experimental procedure and parameters, characterization of the samples and the results are described. Based on the results obtained, the kinetic parameters were evaluated determining the apparent activation energy (E0) and the pre-exponential frequency factor of the Arrehnius equation (κ0) for both samples. It is observed that, increasing the temperature, decreasing the inert gas flow (N2) and using CO atmosphere, improves significantly the kinetics of reduction of self-reducing briquettes, raising the rate of iron oxide reduction. The results confirm that the Boudouard reaction is the rate limiting step of the overall reaction, up to 1200℃, when a mixed control starts, where the influence of the iron oxides reduction shall be also considered.
kinetics self-reducing activation energy, briquettes boudouard
D’Abreu José Carlos Noldin Jr José Henrique Kohler Hélio Marques
Catholic University of Rio de Janeiro – PUC-Rio, Rio de Janeiro, Brazil Tecno-Logos S/A,Rio de Janeiro, Brazil Independent Consultant, Rio de Janeiro, Brazil
国际会议
The 5th International Congress on the Science and Technology of Ironmaking(第五届国际炼铁科技大会 ICSTI09)
上海
英文
1326-1330
2009-10-20（万方平台首次上网日期，不代表论文的发表时间）