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还原气氛下含铬污泥中铬形态转化机理的研究

万新宇 高建军 曹志成 吴佩佩 许海川

万新宇, 高建军, 曹志成, 吴佩佩, 许海川. 还原气氛下含铬污泥中铬形态转化机理的研究[J]. 钢铁钒钛, 2022, 43(5): 106-110, 122. doi: 10.7513/j.issn.1004-7638.2022.05.015
引用本文: 万新宇, 高建军, 曹志成, 吴佩佩, 许海川. 还原气氛下含铬污泥中铬形态转化机理的研究[J]. 钢铁钒钛, 2022, 43(5): 106-110, 122. doi: 10.7513/j.issn.1004-7638.2022.05.015
Wan Xinyu, Gao Jianjun, Cao Zhicheng, Wu Peipei, Xu Haichuan. Study on the transformation mechanism of chromium in chromium sludge under reducing atmosphere[J]. IRON STEEL VANADIUM TITANIUM, 2022, 43(5): 106-110, 122. doi: 10.7513/j.issn.1004-7638.2022.05.015
Citation: Wan Xinyu, Gao Jianjun, Cao Zhicheng, Wu Peipei, Xu Haichuan. Study on the transformation mechanism of chromium in chromium sludge under reducing atmosphere[J]. IRON STEEL VANADIUM TITANIUM, 2022, 43(5): 106-110, 122. doi: 10.7513/j.issn.1004-7638.2022.05.015

还原气氛下含铬污泥中铬形态转化机理的研究

doi: 10.7513/j.issn.1004-7638.2022.05.015
基金项目: 国家重点研发计划(2018YFC1900601)项目。
详细信息
    作者简介:

    万新宇,1988年出生,男,河北张家口人,博士,高级工程师,主要工作方向:冶金固废资源化利用,E-mail: wxy17610353825@qq.com

  • 中图分类号: X757

Study on the transformation mechanism of chromium in chromium sludge under reducing atmosphere

  • 摘要: 在还原气氛下对含铬污泥中铬形态转化机理进行了研究,并讨论了转底炉用于处理含铬污泥的可行性。结果表明,铬在污泥中主要以氢氧化铬、铬酸钙和铬酸钠的形式存在;在CO-CO2气氛下,还原后铬泥中的三价铬不会氧化成六价铬且铬泥原有的六价铬会被还原成三价铬,在相同CO浓度下,随着铬泥配比增大,六价铬转化率逐步降低;在CO-CO2-O2-N2气氛下,配加3%和6%的氧气后,六价铬转化率和六价铬变化率均为负值,三价铬仍不会氧化成六价铬。因此,将含铬污泥在转底炉工序进行无害化处置是可行的。
  • 图  1  铬泥XRD分析结果

    Figure  1.  XRD pattern of chromium sludge

    表  1  含铬污泥的主要化学成分

    Table  1.   Main chemical composition of chromium sludge %

    Cr2O3CaOFe2O3SiO2Al2O3MgOClNa2OK2O
    5.93732.501.7810.7599.860.1650.1780.2190.012
    CuOZnOPbOTiO2SrOBiP2O5SO3其它
    0.010.04470.0090.03200.01230.00360.07646.511.8914
    下载: 导出CSV

    表  2  含铁尘泥混合料的主要化学成分

    Table  2.   Main chemical composition of iron-bearing dust %

    Cr2O3CaOFe2O3SiO2Al2O3MgOClNa2OK2O
    0.0297.9267.963.391.692.032.060.9820.361
    CuOZnOPbOTiO2SrOMnOP2O5SO3其它
    0.0222.3190.2580.09490.0080.5290.02021.289.04
    下载: 导出CSV

    表  3  试验焙烧制度

    Table  3.   Roasting parameters of the experiment

    区域温度/℃时间/min
    排烟段1050~11506.88
    预热段
    还原一区1150~12305.00
    还原二区1230~12804.38
    还原三区12505.00
    冷却段11500.83
    下载: 导出CSV

    表  4  CO-CO2气氛下六价铬的变化情况

    Table  4.   Variation of hexavalent chromium content under CO-CO2 atmosphere

    气氛$ \phi $/%β/%
    0.2%1.0%3.0%5.0%0.2%1.0%3.0%5.0%
    O2=100%0.560.560.240.2611.7529.1224.5750.60
    CO=2% CO2=98%−2.18−1.00−0.49−0.27−46.06−52.23−49.08−51.52
    CO=5% CO2=95%−2.94−0.94−0.60−0.21−62.08−49.01−60.13−41.68
    CO=10% CO2=90%−1.15−0.35−0.35−0.15−44.24−58.44−45.73−48.38
    CO=20% CO2=80%−1.79−0.94−0.45−0.17−37.87−48.96−45.51−33.33
    下载: 导出CSV

    表  5  混合气氛下六价铬的变化情况

    Table  5.   Variation of hexavalent chromium content under mixed atmosphere

    气氛$ \phi $/%β/%
    0.2%0.5%1.0%0.2%0.5%1.0%
    CO=10%,O2=3%,N2+CO2=87%−3.39−7.47−13.42−38.65−63.58−77.37
    CO=5%,O2=6%,N2+CO2=89%−3.84−7.70−13.20−43.80−65.59−76.10
    下载: 导出CSV

    表  6  不同气氛下铬元素的分布情况

    Table  6.   Distribution of chromium element in different atmospheres

    试验参数∆Cr(焙烧后-焙烧前)
    气氛铬泥配比/%∆TCr/g∆Cr6+/g∆Cr3+/g
    CO=2%,
    CO2=98%
    0.2−0.0022−0.0002−0.0020
    1.0−0.0059−0.0002−0.0057
    3.0−0.0076−0.0003−0.0073
    5.0−0.0065−0.0002−0.0064
    CO=5%,
    CO2=95%
    0.2−0.0016−0.0004−0.0013
    1.0−0.0066−0.0002−0.0063
    3.0−0.0066−0.0003−0.0063
    5.0−0.0078−0.0002−0.0076
    CO=10%,
    CO2=90%
    0.2−0.0004−0.0001−0.0003
    1.0−0.0074−0.0001−0.0074
    3.0−0.0050−0.0002−0.0049
    5.0−0.0085−0.0001−0.0084
    CO=20%,
    CO2=80%
    0.2−0.0007−0.0002−0.0005
    1.0−0.0073−0.0002−0.0070
    3.0−0.0008−0.0002−0.0006
    5.0−0.0083−0.0001−0.0082
    CO=10%,O2=3%,
    N2+CO2=87%
    0.2−0.0017−0.0005−0.0012
    0.5−0.0039−0.0012−0.0027
    1.0−0.0038−0.00220.0016
    CO=5%,O2=6%,
    N2+CO2=89%
    0.2−0.0008−0.0005−0.0003
    0.5−0.0039−0.0012−0.0027
    1.0−0.0039−0.00220.0017
    下载: 导出CSV
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出版历程
  • 收稿日期:  2022-05-06
  • 刊出日期:  2022-11-01

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