Effect of TiO2 during Oxidation Roasting Process of Pellet: Kinetic Mechanism and Microstructure

Author:

Feng Jinge123,Tang Jue14ORCID,Wang Xiaoai5,Chu Mansheng34,Zhao Zichuan123,Liu Zhenggen23,Li Lanjie5

Affiliation:

1. School of Metallurgy Northeastern University Shenyang 110819 P. R. China

2. Institute for Frontier Technologies of Low‐carbon Steelmaking Northeastern University Shenyang 110819 P. R. China

3. Liaoning Low‐Carbon Steelmaking Technology Engineering Research Center Northeastern University Shenyang 110819 P. R. China

4. Engineering Research Center of Frontier Technologies for Low‐carbon Steelmaking Ministry of Education Shenyang 110819 P. R. China

5. School of Material HBIS Group Co., Ltd. Iron and Steel Research Institute of HBIS Group Co., Ltd. Shijiazhuang 050000 China

Abstract

This study investigates the effect of TiO2 on the oxidation kinetic mechanism of iron ore concentrate under nonisothermal conditions. Based on the fact that iron‐containing materials are mainly smelted in the form of pellets, the microstructure evolution of pellets with different TiO2 additions during oxidation is studied to verify the accuracy of the kinetic analysis results. The results show that the reaction model is the mechanism describing oxidation of iron ore concentrate under different TiO2 additions at stages I and II. The increase of TiO2 increases E and worsens the oxidation kinetic conditions at stages I and II. This phenomenon is caused by the Fe–Ti solid solution embedded in the hematite particles hindering the recrystallization and large‐scale crystal bridge connection of hematite. The fluctuation amplitude of apparent activation energy (E) at stages I and II is 23.6112 and 19.508 kJ mol−1, respectively. Furthermore, the mechanism of stage III corresponds to the diffusion model, and the increase of TiO2 decreases E and improves the oxidation kinetic conditions. It is due to the loose structure of pellets with the increase of TiO2, facilitating the internal diffusion of reaction gases. The fluctuation amplitude of E is 5.07 kJ mol−1 at stage III.

Funder

National Natural Science Foundation of China

University of Science and Technology Liaoning

Hebei Provincial Key Research Projects

National Ten Thousand Talent Program

Central University Basic Scientific Research Business Expenses Special Funds

Publisher

Wiley

Subject

Materials Chemistry,Metals and Alloys,Physical and Theoretical Chemistry,Condensed Matter Physics

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