Effect of preoxidation on the reduction of ilmenite concentrate powder by hydrogen |
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| Affiliation: | 1. State Key Laboratory of Mechanical Transmissions, Chongqing University, Chongqing 400044, China;2. Chongqing Key Laboratory of Vanadium-Titanium Metallurgy and New Materials, Chongqing University, Chongqing 400044, China;3. College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China;4. Pangang Group Research Institute Co. Ltd., Panzhihua, 617000, China;5. Chongqing Qianxin energy environmental protection Co., Ltd., Chongqing 401221, China;1. School of Materials and Metallurgy, Guizhou University, Guiyang 550025, China;2. Guizhou Province Key Laboratory of Metallurgical Engineering and Energy Process Energy, Guiyang 550025, China;1. College of Materials Science and Engineering, Chongqing University, Chongqing, 400044, PR China;2. State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou University of Technology, Lanzhou, 730050, PR China;3. State Key Laboratory of Mechanical Transmissions, Chongqing University, Chongqing, 400044, PR China;4. Spectris Instr. & Sys. Shanghai Ltd., Malvern Panalytical (China), Shanghai, 200233, PR China;5. National Innovation (Qingdao) High Speed Train Material Research Institute Co. Ltd., Qingdao, 266109, PR China;1. State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing, China;2. Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing, Beijing 100083, China;1. School of Materials Science and Engineering, Shanghai University, Shanghai 200072, China;2. State Key Laboratory of Advanced Special Steels, Shanghai University, Shanghai 200072, China;3. Shanghai Key Laboratory of Advanced Ferro-metallurgy, Shanghai University, Shanghai 200072, China |
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| Abstract: | In this study, hydrogen reduction of raw and preoxidized ilmenite concentrates powder, with particle size less than 74 μm, is investigated using a thermal analyzer at 1123, 1173, and 1223 K in a 30% H2 + 70% Ar atmosphere. The reduction rate by hydrogen was found to be accelerated due to preoxidation treatment of the raw ilmenite concentrate. The reduction of both raw and preoxidized ilmenite concentrates can be divided into two stages: Fe3+→Fe2+ and Fe2+→Fe. The Fe3O4→FeO stage overlaps with the Fe2O3→Fe3O4 stage during reduction process of the preoxidized ilmenite concentrate. Moreover, the preoxidation treatment can effectively decrease the reduction activation energy. The scanning electron microscopy (SEM) and the X-ray powder diffraction (XRD) techniques were used to characterize the micromorphology and phase of the products. The promotion mechanism of reduction of ilmenite by hydrogen through preoxidation treatments is also discussed. |
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| Keywords: | Ilmenite concentrate Preoxidation Hydrogen reduction Activation energy |
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