Thermodynamics and kinetics of alumina and magnesium oxide in calcium ferrite sintering process

Rende Chang, Chengyi Ding, Hongming Long, Xuewei Lv, Tiejun Chun, Xiaoqing Xu, Zhiming Yan, Xuchao Wang, Sheng Xue, Wei Lv

分享

计量
  • 文章访问数:  132
  • HTML全文浏览量:  42
  • PDF下载量:  10
  • 被引次数: 0

目录

    Cite this article as:

    Rende Chang, Chengyi Ding, Hongming Long, Xuewei Lv, Tiejun Chun, Xiaoqing Xu, Zhiming Yan, Xuchao Wang, Sheng Xue, and Wei Lv, Thermodynamics and kinetics of alumina and magnesium oxide in calcium ferrite sintering process, Int. J. Miner. Metall. Mater.,(2024). https://dx.doi.org/10.1007/s12613-024-3070-x
    Rende Chang, Chengyi Ding, Hongming Long, Xuewei Lv, Tiejun Chun, Xiaoqing Xu, Zhiming Yan, Xuchao Wang, Sheng Xue, and Wei Lv, Thermodynamics and kinetics of alumina and magnesium oxide in calcium ferrite sintering process, Int. J. Miner. Metall. Mater.,(2024). https://dx.doi.org/10.1007/s12613-024-3070-x
    引用本文 PDF XML SpringerLink
    研究论文

    Research Article

    Thermodynamics and kinetics of alumina and magnesium oxide in calcium ferrite sintering process

    Author Affilications
    • Received: 20 October 2024; Revised: 08 December 2024; Accepted: 11 December 2024; Available online: 12 December 2024

    Al2O3 and MgO are the primary gangue components in sintered ores, critical for the formation of the CaO-Fe2O3-Al2O3(CF-A) and CaO-Fe2O3-MgO (CF-M) systems. This study examines the non-isothermal crystallization kinetics of CF-A and CF-M systems using Differential Scanning Calorimetry (DSC). Crystallization processes at different cooling rates (5, 10, 15, and 20 K/min) were investigated, with phase identification and microstructural analysis performed via X-ray Diffraction (XRD) and Scanning Electron Microscopy (SEM). Results show that at 2 wt.% Al2O3 and MgO, increasing cooling rates promotes the precipitation of CaFe2O4 (CF) in both systems, inhibiting Ca2Fe2O5 (C2F) formation. However, crystallization weakens when cooling rates exceed 20 K/min. The addition of Al2O3 and MgO does not alter the precipitation mechanisms of C2F and CF compared to the Fe2O3-CaO (C-F) system. Increased Al2O3 content reduces the initial crystallization temperatures of CF and CF₂A to 1578 K and 1566 K, respectively, slowing the C2F and CF precipitation processes and delaying the peritectic reaction temperature from 1489 K to 1473 K. In CF4A (4 wt.% Al2O3) and CF8A (8 wt.% Al2O3) systems, the liquid-to-solid transition involving C2(A, F) precipitation and the peritectic reaction involving C(A, F) phases become more gradual, with peritectic reaction temperatures delayed to 1455 K and 1416 K, respectively.  Increasing MgO content raises the crystallization temperature of the CF4M (4 wt.% MgO) system. Enhanced precipitation of MF (The spinel phase is mainly composed of Fe3O4 and MgFe2O4) and CF phases suppresses the CF-related peritectic reaction, which ceases in the CF8M system. The crystallization behaviors of CF2A (2 wt.% Al2O3), CF2M (2 wt.% MgO), and CF are similar. Using the Ozawa method, the apparent activation energies of CF2A and CF2M systems are higher than those of single-step processes. Malek’s method shows that the CF2A system initially follows a logarithmic law (lnα or lnα2), later transitioning to a reaction order law ((1-α)-1 or (1-α)-1/2, n=2/3) or the lnα2 function of the exponential law. The CF2M system consistently follows the sequence ƒ(α) = (1-α)2.

     

    Relative Articles

    Jun-wei Chen, Yang Jiao, Xi-dong Wang. Thermodynamic studies on gas-based reduction of vanadium titano-magnetite pellets [J]. 矿物冶金与材料学报(英文版). DOI: 10.1007/s12613-019-1795-8

    View details

    Xue-feng Bai, Yan-hui Sun, Rui-mei Chen, Yi-min Zhang, Yi-fan Cai. Formation and thermodynamics of CaS-bearing inclusions during Ca treatment in oil casting steels [J]. 矿物冶金与材料学报(英文版). DOI: 10.1007/s12613-019-1766-0

    View details

    Feng Chen, Wei Chen, Yu-feng Guo, Shuai Wang, Fu-qiang Zheng, Tao Jiang, Ze-qiang Xie, Ling-zhi Yang. Thermodynamics and phase transformations in the recovery of zinc from willemite [J]. 矿物冶金与材料学报(英文版). DOI: 10.1007/s12613-018-1691-7

    View details

    Cui Wang, Jian-liang Zhang, Guang-wei Wang, Ke-xin Jiao, Zheng-jian Liu, Kuo-chih Chou. Combustion characteristics and kinetics of anthracite with added chlorine [J]. 矿物冶金与材料学报(英文版). DOI: 10.1007/s12613-017-1458-6

    View details

    Int. J. Miner. Metall. Mater., 2017, 24(5): 486-492.

    PDF View details

    Aref Sardari, Eskandar Keshavarz Alamdari, Mohammad Noaparast, Sied Ziaedin Shafaei. Kinetics of magnetite oxidation under non-isothermal conditions [J]. 矿物冶金与材料学报(英文版). DOI: 10.1007/s12613-017-1429-y

    View details

    Jian-Hua Chen, Xian-Hao Long, Li-Hong Lan, Qian He. Thermodynamics and density functional theory study of potassium dichromate interaction with galena [J]. 矿物冶金与材料学报(英文版). DOI: 10.1007/s12613-014-0994-6

    View details

    Li-li Cheng, Ti-chang Sun, Xian-ping Luo, Dian-zuo Wang. Kinetics of the electrochemical process of galena electrodes in the diethyldithiocarbamate solution [J]. 矿物冶金与材料学报(英文版). DOI: 10.1007/s12613-010-0372-y

    View details

    Int. J. Miner. Metall. Mater., 2000, 7(1): 14-17.

    PDF View details

    Jisong Yi, Ping Wang, Jie Fu, Baohong Tu, Jin Li, Jianxin Liu, Wu Wen, Chenggang Huang. Thermodynamics of Slag-desulphuration in VD Process [J]. 矿物冶金与材料学报(英文版).

    View details

    /

    返回文章
    返回