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基于钒铬渣钙化焙烧过程的V2O5/Cr2O3-CaO体系固相反应扩散行为

孙红艳 温婧 陈泊键 余唐霞 姜涛

孙红艳, 温婧, 陈泊键, 余唐霞, 姜涛. 基于钒铬渣钙化焙烧过程的V2O5/Cr2O3-CaO体系固相反应扩散行为[J]. 钢铁钒钛, 2021, 42(3): 17-24. doi: 10.7513/j.issn.1004-7638.2021.03.003
引用本文: 孙红艳, 温婧, 陈泊键, 余唐霞, 姜涛. 基于钒铬渣钙化焙烧过程的V2O5/Cr2O3-CaO体系固相反应扩散行为[J]. 钢铁钒钛, 2021, 42(3): 17-24. doi: 10.7513/j.issn.1004-7638.2021.03.003
Sun Hongyan, Wen Jing, Chen Bojian, Yu Tangxia, Jiang Tao. Solid phase reaction and diffusion behavior of V2O5/Cr2O3-CaO system based on calcification roasting of chromium–containing vanadium slag[J]. IRON STEEL VANADIUM TITANIUM, 2021, 42(3): 17-24. doi: 10.7513/j.issn.1004-7638.2021.03.003
Citation: Sun Hongyan, Wen Jing, Chen Bojian, Yu Tangxia, Jiang Tao. Solid phase reaction and diffusion behavior of V2O5/Cr2O3-CaO system based on calcification roasting of chromium–containing vanadium slag[J]. IRON STEEL VANADIUM TITANIUM, 2021, 42(3): 17-24. doi: 10.7513/j.issn.1004-7638.2021.03.003

基于钒铬渣钙化焙烧过程的V2O5/Cr2O3-CaO体系固相反应扩散行为

doi: 10.7513/j.issn.1004-7638.2021.03.003
基金项目: 国家自然基金面上项目(51574082);钒钛资源综合利用国家重点实验室资助项目
详细信息
    作者简介:

    孙红艳(1996—),女,黑龙江大庆人,硕士研究生

    通讯作者:

    姜涛(1973—),男,辽宁本溪人,教授,博士生导师,长期从事钒钛资源综合利用方面研究工作,E-mail:jiangt@smm.neu.edu.cn

  • 中图分类号: TF841.3

Solid phase reaction and diffusion behavior of V2O5/Cr2O3-CaO system based on calcification roasting of chromium–containing vanadium slag

  • 摘要: 为探究钒铬渣钙化焙烧过程钒、铬组元与钙反应能力的差异,在热力学分析基础上,以V2O5、Cr2O3、CaO纯物质为原料,采用恒温焙烧法分别制备出V2O5-CaO与Cr2O3-CaO扩散偶。利用扫描电镜与能谱仪观测不同恒温时间后扩散界面的微观形貌以及产物层元素分布,分析恒温时间对固相界面反应的影响,并利用wagner方程对体系互扩散系数进行计算。结果表明:在空气气氛中873 K恒温焙烧9 h后,V2O5-CaO扩散偶界面产物层清晰,厚度与时间的平方根存在线性关系,说明该固相反应由扩散控速,产物以CaV2O6为主。而相同焙烧条件下,Cr2O3-CaO间未见明显的界面产物层,说明V2O5-CaO间固-固界面反应能力更强,其互扩散系数量级为10−10 cm2·s−1
  • 图  1  扩散偶制备流程

    Figure  1.  Preparation process of V2O5/Cr2O3 -CaO diffusion couple

    图  2  V2O5/Cr2O3-CaO体系反应的热力学关系图

    Figure  2.  Gθ-T graph of the formation reaction of V2O5/Cr2O3-CaO system

    图  3  V2O5-CaO扩散偶873 K恒温焙烧0~9 h线扫描分析

    Figure  3.  Line scanning of V2O5 -CaO diffusion couples roasted at 873 K for 0~9 h

    图  4  V2O5 -CaO扩散偶873 K恒温焙烧9 h的背散射电子像与元素分布

    Figure  4.  BSE and elements distribution of V2O3-CaO diffusion couple roasted at 873 K for 9 h

    图  5  Cr2O3-CaO扩散偶界面微观形貌

    Figure  5.  The morphology of Cr2O3-CaO diffusion couples

    图  6  Cr2O3-CaO扩散偶873 K恒温焙烧15 h线扫描分析

    Figure  6.  Line scanning of Cr2O3-CaO diffusion couple roasted at 873 K for 15 h

    图  7  Cr2O3-CaO扩散偶873 K恒温焙烧15 h的背散射电子像与元素分布

    Figure  7.  BSE and elements distribution of Cr2O3-CaO diffusion couple roasted at 873 K for 15 h

    图  8  873 K条件下V2O5-CaO扩散偶产物层厚度与时间关系

    Figure  8.  Relationship of the product layers of V2O5-CaO diffusion couple with time at 873 K

    图  9  V2O5-CaO扩散偶873 K恒温焙烧9 h的浓度分布曲线

    Figure  9.  Concentration distribution curve of V2O5-CaO diffusion couple for 9 h at 873 K

    表  1  扩散试验条件

    Table  1.   Conditions of diffusion experiment

    扩散偶温度/K气氛恒温扩散时间/h
    V2O5-CaO873空气0,3,6,9
    Cr2O3-CaO873空气0,3,6,9,12,15
    下载: 导出CSV

    表  2  873 K恒温焙烧9 h的V2O5-CaO扩散偶互扩散系数

    Table  2.   Diffusion coefficient of V2O5-CaO diffusion couple at 873 K for 9 h

    恒温时间/
    h
    D×1010(NCa=0.02±0.002)/
    (cm2∙s−1
    D×1010(NCa=0.05±0.002)/
    (cm2∙s−1
    D×1010(NCa=0.12±0.01)/
    (cm2∙s−1
    D×1010(NCa=0.48±0.01)/
    (cm2∙s−1
    90.1960.1411.1370.017
    下载: 导出CSV
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  • 收稿日期:  2021-03-12
  • 刊出日期:  2021-06-10

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