赤泥基全固废矿井充填材料的制备与性能研究
作者:
作者单位:

中国矿业大学(北京) 化学与环境工程学院, 北京 100083

作者简介:

史建新(1996—),男,山东淄博人,中国矿业大学(北京)硕士生.E-mail:jianxin000@163.com

通讯作者:

刘 泽(1981—),男,山西朔州人,中国矿业大学(北京)教授,博士生导师,博士.E-mail:lzk1227@sina.com

中图分类号:

TU528.09

基金项目:

中国矿业大学(北京)中央高校优秀青年团队项目(2023YQTD03)


Fabrication and Performance of Mine Filling Materials Derived from Red Mud Based Full Solid Wastes
Author:
Affiliation:

School of Chemistry and Environmental Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China

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    摘要:

    为实现拜耳法赤泥的资源化利用,采用拜耳法赤泥、电石渣、矿粉和煤矸石等制备了赤泥基全固废矿井充填材料.研究了不同赤泥、电石渣掺量对充填材料力学性能与工作性能的影响,并采用X射线衍射仪(XRD)、扫描电子显微镜及能谱仪(SEM-EDS)、电感耦合等离子体发射光谱仪(ICP-OES)等微观测试手段,分析了赤泥基全固废矿井充填料浆的水化产物、微观结构演变以及重金属浸出毒性.结果表明:矿井充填材料中,当赤泥占胶凝材料的50%,充填浓度为75%时,充填料浆的流动度可达230 mm,充填料浆硬化体7、28 d的抗压强度分别达到2.29、2.88 MPa,满足大多数矿井充填材料工作性能与力学性能的要求.使用赤泥制备矿井充填材料后,As、Cd、Cr、Pb等重金属离子的浸出浓度显著下降,远低于GB/T 14848—2017《地下水环境质量标准》要求的浸出毒性限制.

    Abstract:

    To achieve the resource utilization of Bayer red mud, it is used that Bayer red mud, carbide slag, blast furnace slag and coal gangue to prepare red mud based mine filling materials without natural materials. The effects of different content of red mud and carbide slag on the mechanical properties and working performance of the filling materials were investigated. And the hydration products, microstructural evolution, and heavy metal toxicity of the red mud based mine filling materials were analyzed by using microscopic testing techniques such as X-ray diffraction (XRD), scanning electron microscopy and energy spectroscopy (SEM-EDS), inductively coupled plasma emission spectrometry (ICP-OES) and so on. The results show that when the red mud accounts for 50% in binding material, and the solid content of the backfill slurry is 75%, the fluidity of the backfill slurry is 230 mm, the compressive strength of the backfill can reach 2.29, 2.88 MPa at age of 7 d and 28 d, respectively, which meet the requirements of most mine backfilling performance and mechanical property. After using red mud to prepare mine filling materials, the leaching concentration of As, Cd, Cr, Pb and other heavy metal ions in it decreased significantly, far lower than the leaching toxicity requirements of standard GB/T14848—2017 Standard for Groudwater Quality.

    表 1 赤泥、电石渣和矿粉的化学组成Table 1 Chemical compositions(by mass) of red mud, carbide slag, and blast furnace slag Unit: %
    表 2 破碎煤矸石颗粒筛分分析Table 2 Screening analysis of crushed coal gangue particles
    表 4 流变性能测试拟合结果Table 4 Fitting results of rheological property test
    表 3 试验充填料浆配比Table 3 Mix proportion(by mass) of experimental backfill slurry Unit: %
    表 5 赤泥基矿井充填体浸出液重金属浓度Table 5 Concentration of heavy metals in the leaching solution of red mud based backfill
    图1 赤泥、矿粉、电石渣的XRD图谱Fig.1 XRD patterns of red mud, blast furnace slag, carbide slag
    图2 原材料的粒度分布曲线Fig.2 Particle size distribution curves of raw materials
    图3 电石渣、赤泥掺量对充填材料抗压强度的影响Fig.3 Influence of carbide slag and red mud content on compressive strength of blackfill materials
    图4 电石渣、赤泥掺量对充填材料沉缩比的影响Fig.4 Influence of carbide slag and red mud content on settling ratio of backfill slurry
    图5 赤泥和电石渣掺量对充填料浆流动度的影响Fig.5 Effect of red mud and carbide slag content on fluidity of backfill slurry
    图6 充填料浆净浆的流变拟合曲线Fig.6 Rheological fitting curves of backfill slurry without aggregate
    图7 赤泥掺量为60%时不同电石渣掺量下硬化充填体的XRD图谱Fig.7 XRD patterns of hardened backfill with 60% red mud and different carbide slag contents
    图8 赤泥掺量为60%时不同电石渣掺量下充填体的SEM照片Fig.8 SEM images of backfill at different curing ages with 60% red mud and different carbide slag contents
    图9 SEM图中点 A、B、C的能谱分析Fig.9 EDS analyses of point A, B and C in SEM images
    图10 养护龄期为28 d的充填体表面元素分布Fig.10 Distribution of elements on the surface of backfill with curing for 28 d
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史建新,孙星海,周林邦,刘泽,王栋民.赤泥基全固废矿井充填材料的制备与性能研究[J].建筑材料学报,2024,27(10):946-954

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  • 收稿日期:2024-01-11
  • 最后修改日期:2024-05-20
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