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采用机械活化工艺制备建筑用地聚合物的试验研究

郑卫芳 穆勇攀

郑卫芳, 穆勇攀. 采用机械活化工艺制备建筑用地聚合物的试验研究[J]. 钢铁钒钛, 2021, 42(4): 92-96, 110. doi: 10.7513/j.issn.1004-7638.2021.04.016
引用本文: 郑卫芳, 穆勇攀. 采用机械活化工艺制备建筑用地聚合物的试验研究[J]. 钢铁钒钛, 2021, 42(4): 92-96, 110. doi: 10.7513/j.issn.1004-7638.2021.04.016
Zheng Weifang, Mu Yongpan. Preparation of geopolymer for building by mechanical activation process[J]. IRON STEEL VANADIUM TITANIUM, 2021, 42(4): 92-96, 110. doi: 10.7513/j.issn.1004-7638.2021.04.016
Citation: Zheng Weifang, Mu Yongpan. Preparation of geopolymer for building by mechanical activation process[J]. IRON STEEL VANADIUM TITANIUM, 2021, 42(4): 92-96, 110. doi: 10.7513/j.issn.1004-7638.2021.04.016

采用机械活化工艺制备建筑用地聚合物的试验研究

doi: 10.7513/j.issn.1004-7638.2021.04.016
基金项目: 河南省教育科学“十三五”规划项目([2017]-JKGHYB-0255)
详细信息
    作者简介:

    郑卫芳(1986−),女,河南郑州人,硕士,讲师,通讯作者,研究方向:道路与桥梁、交通工程与建筑材料,E-mail:602019862@qq.com

  • 中图分类号: X751

Preparation of geopolymer for building by mechanical activation process

  • 摘要: 利用钒钛磁铁矿尾矿制备地聚合物,既减轻了尾矿的污染,又实现了尾矿的高效利用。以承德某钒钛磁铁矿尾矿为主要原料,采用机械活化工艺制备地聚合物,探讨活化时间对尾矿的粒度、结构与地聚合物制品抗压强度的影响。结果表明:延长活化时间减小了尾矿粒度,破坏了矿物的晶体结构,从而增大了尾矿中活性硅与活性铝的浸出浓度,赋予地聚合物较高的抗压强度。当尾矿活化3.0 h后,采用尾矿与高岭土的质量比为6:4,Ca(OH)2和Na2SiO3的掺量均为10%、胶砂比为1∶1.5、液固比为0. 20的工艺条件,可制备出28 d 抗压强度高达50 MPa的地聚合物。样品的重金属离子浸出浓度符合国家标准。无定型的铝硅酸盐凝胶相及少量的沸石结合紧密,赋予制品较高的强度。
  • 图  1  经不同时间活化后尾矿的XRD谱

    Figure  1.  XRD patterns of tailings after activation for different time

    图  2  经活化前后的尾矿的红外光谱

    Figure  2.  Infrared spectra of tailings before and after activation

    图  3  尾矿中活性硅与活性铝的浸出浓度随活化时间的变化曲线

    Figure  3.  Variation of leaching concentration of active silicon and aluminum in tailings with activation time

    图  4  地聚合物抗压强度随活化时间的变化曲线

    Figure  4.  Compressive strength curves of geopolymer with activation time

    图  5  地聚物的XRD谱图

    Figure  5.  XRD pattern of geopolymer

    图  6  地聚合物的SEM照片

    Figure  6.  SEM images of geopolymer

    表  1  尾矿和偏高岭土的化学组成

    Table  1.   Chemical compositions of tailings and kaolin %

    原料SiO2Al2O3Fe2O3CaOMgONa2OK2OTiO2SO3V2O5LOI
    尾矿56.8912.566.399.651.262.631.691.505.390.022.02
    高岭土40.2946.980.620.090.290.330.960.520.129.80
    下载: 导出CSV

    表  2  经机械活化后尾矿的粒度分布及比表面积

    Table  2.   Particle size distribution and specific surface area of tailings after mechanical activation

    活化时间/h−10 µm含量/%d50/µmd90/µm比表面积/
    (m2·g−1
    040.2619.5578.120.30
    0.550.9616.3460.580.43
    1.058.3812.6945.230.52
    1.564.229.6435.120.86
    2.070.696.9727.920.95
    2.575.164.4722.641.13
    3.080.222.9517.311.20
    3.583.691.9415.551.22
    下载: 导出CSV

    表  3  样品重金属浸出浓度与相关标准要求

    Table  3.   Leaching concentration of heavy metals of the sample and the related standard requirements mg/L

    CuPbCdCrZn
    含量2.333.690.6711.0619.28
    标准限值<3.00<5.00<1.00<15.00<100.00
    下载: 导出CSV
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出版历程
  • 收稿日期:  2021-02-27
  • 刊出日期:  2021-08-10

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