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Metals 2018, 8(1), 49; doi:10.3390/met8010049

In Situ Spectroscopic Analysis of the Carbothermal Reduction Process of Iron Oxides during Microwave Irradiation

Department of Applied Chemistry, Tohoku University, Aoba Aramaki, Sendai, Miyagi 980-8579, Japan
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Received: 25 December 2017 / Revised: 9 January 2018 / Accepted: 9 January 2018 / Published: 11 January 2018
(This article belongs to the Special Issue Ironmaking and Steelmaking)
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Abstract

The effects of microwave plasma induction and reduction on the promotion of the carbothermal reduction of iron oxides (α-Fe2O3, γ-Fe2O3, and Fe3O4) are investigated using in situ emission spectroscopy measurements during 2.45 GHz microwave processing, and the plasma discharge (such as CN and N2) is measured during microwave E-field irradiation. It is shown that CN gas or excited CN molecules contribute to the iron oxide reduction reactions, as well as to the thermal reduction. On the other hand, no plasma is generated during microwave H-field irradiation, resulting in thermal reduction. Magnetite strongly interacts with the microwave H-field, and the reduction reaction is clearly promoted by microwave H-field irradiation, as well as thermal reduction reaction. View Full-Text
Keywords: ironmaking; microwaves; carbothermal reduction; iron oxides; emission spectrum ironmaking; microwaves; carbothermal reduction; iron oxides; emission spectrum
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Fukushima, J.; Takizawa, H. In Situ Spectroscopic Analysis of the Carbothermal Reduction Process of Iron Oxides during Microwave Irradiation. Metals 2018, 8, 49.

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