Diffusion behavior and distribution regulation of MgO in MgO-bearing pellets

Qiang-jian Gao, Yan-song Shen, Guo Wei, Xin Jiang, Feng-man Shen

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    Cite this article as:

    Qiang-jian Gao, Yan-song Shen, Guo Wei, Xin Jiang, and Feng-man Shen, Diffusion behavior and distribution regulation of MgO in MgO-bearing pellets, Int. J. Miner. Metall. Mater., 23(2016), No. 9, pp.1011-1018. https://dx.doi.org/10.1007/s12613-016-1318-9
    Qiang-jian Gao, Yan-song Shen, Guo Wei, Xin Jiang, and Feng-man Shen, Diffusion behavior and distribution regulation of MgO in MgO-bearing pellets, Int. J. Miner. Metall. Mater., 23(2016), No. 9, pp.1011-1018. https://dx.doi.org/10.1007/s12613-016-1318-9
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    Diffusion behavior and distribution regulation of MgO in MgO-bearing pellets

    基金项目: 

    The authors would like to thank the editor and referees for their constructive comments and suggestions which have been used to improve the readability of the paper. Also, the financial support of China Postdoctoral Science Foundation (No. 2016M591445), Postdoctoral Science Foundation of NEU China (No. 20160302) and National Natural Science Foundation of China (No. 51604069) are much appreciated.

      通信作者:

      Feng-man Shen E-mail: gaoqiangjian@163.com

    In this paper, the diffusion behavior between MgO and Fe2O3 (the main iron oxide in pellets) is investigated using a diffusion couple method. In addition, the distribution regulation of MgO in MgO-bearing pellets is analyzed via pelletizing experiments. The results illustrate that MgO is prone to diffuse into Fe2O3 in the form of solid solution; the diffusion rate considered here is 13.64 µm·min-1. Most MgO content distributes in the iron phase instead of the slag phase. The MF phase {(Mg1-x Fex)O·Fe2O3, x ≤ 1} is generated in the MgO-bearing pellets. However, the distribution of MgO in the radial direction of the pellets is inconsistent. The solid solution portion of MgO in the MF phase is larger in the outer layer of the pellets than in the inner layer. In this work, the approximate chemical composition of the MF phase in the outer layer of the pellets is {(Mg0.35-0.77·Fe0.65-0.23) O·Fe2O3} and in the inner layer is {(Mg0.13-0.45·Fe0.87-0.55) O·Fe2O3}.

     

    Diffusion behavior and distribution regulation of MgO in MgO-bearing pellets

    Author Affilications
    • Funds: 

      The authors would like to thank the editor and referees for their constructive comments and suggestions which have been used to improve the readability of the paper. Also, the financial support of China Postdoctoral Science Foundation (No. 2016M591445), Postdoctoral Science Foundation of NEU China (No. 20160302) and National Natural Science Foundation of China (No. 51604069) are much appreciated.

    • Received: 11 December 2015; Revised: 24 May 2016; Accepted: 29 May 2016;
    In this paper, the diffusion behavior between MgO and Fe2O3 (the main iron oxide in pellets) is investigated using a diffusion couple method. In addition, the distribution regulation of MgO in MgO-bearing pellets is analyzed via pelletizing experiments. The results illustrate that MgO is prone to diffuse into Fe2O3 in the form of solid solution; the diffusion rate considered here is 13.64 µm·min-1. Most MgO content distributes in the iron phase instead of the slag phase. The MF phase {(Mg1-x Fex)O·Fe2O3, x ≤ 1} is generated in the MgO-bearing pellets. However, the distribution of MgO in the radial direction of the pellets is inconsistent. The solid solution portion of MgO in the MF phase is larger in the outer layer of the pellets than in the inner layer. In this work, the approximate chemical composition of the MF phase in the outer layer of the pellets is {(Mg0.35-0.77·Fe0.65-0.23) O·Fe2O3} and in the inner layer is {(Mg0.13-0.45·Fe0.87-0.55) O·Fe2O3}.

     

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    Rongrong Wang, Jianliang Zhang, Zhengjian Liu, et al. Interaction between iron ore and magnesium additives during induration process of pellets. Powder Technology, 2020, 361: 894. 必应学术
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