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Volume 30 Issue 8
Aug.  2023
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文章导航 >  矿物冶金与材料学报（英文）  > 2023  >  30(8): 1538-1547
Huazhe Jiao, Wenbo Yang, Zhu’en Ruan, Jianxin Yu, Juanhong Liu, and Yixuan Yang, Microscale mechanism of tailing thickening in metal mines, Int. J. Miner. Metall. Mater., 30(2023), No. 8, pp. 1538-1547. https://doi.org/10.1007/s12613-022-2587-0
Cite this article as:
Huazhe Jiao, Wenbo Yang, Zhu’en Ruan, Jianxin Yu, Juanhong Liu, and Yixuan Yang, Microscale mechanism of tailing thickening in metal mines, Int. J. Miner. Metall. Mater., 30(2023), No. 8, pp. 1538-1547. https://doi.org/10.1007/s12613-022-2587-0
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研究论文

金属矿山尾矿浓密微观机理

  • 1)

    河南理工大学土木工程学院, 焦作 454000, 中国

  • 2)

    北京科技大学土木与资源工程环境, 北京 100083, 中国



  • 通讯作者:

    阮竹恩    E-mail: ustb_ruanzhuen@hotmail.com

文章亮点

  • (1) 运用拓扑学原理对孔隙进行精细化表征并分析孔隙结构的剪切演化机理。
  • (2) 从微观角度揭示连续动态条件下底流料浆内部水分排出过程。
  • (3) 发现孔隙结构与渗流通道之间的相互作用并深入分析导水通道演化对底流浓度的影响。
  • 超细尾矿颗粒形成的锁水絮体会破坏膏体制备过程中浓密机底流浓度。当研究深度脱水阶段时，尾砂浆体的微观结构和渗流特性之间的关系通常会被忽略。文章利用铜尾矿展开了全尾砂堆积床层剪切渗透性测试，借助CT扫描技术分析了微观孔隙的形态和几何分布情况，运用三维重构方法真实还原了浆料内部孔隙结构和渗流通道剪切演化对底流料浆脱水性能的影响。结果表明伴随剪切作用的发生，样品孔隙率有较大幅度的降低。添加剪切作用且搅拌时间为10 min时，样品连通孔隙比及吼道平均半径达到最大，分别为0.79和31.38μm。但在添加剪切作用后样品流速和绝对渗透性有不同幅度的降低，最大流速达到1.537μm/s，绝对渗透率提高了14.16%。剪切作用改变了导水通道的形成阶段和孔隙结构，孤立的孔隙与周围絮体连接形成分支通道，继而成为主渗流通道，形成了优势导水通道。
    • Research Article

    Microscale mechanism of tailing thickening in metal mines

    + Author Affiliations
      Abstract
    • Water-locking flocs formed by ultrafine tailings particles will damage the thickener underflow concentration in the thickening process during paste preparation. The relationship between the mesostructure and seepage characteristics of tail mortar is typically ignored when investigating the deep dehydration stage. A shearing seepage test of an unclassified tailing–sedimentation bed was performed with copper tailings, and the morphology and geometric distribution of micropores were analyzed via X-ray computed tomography. Moreover, the shearing evolution of the micropore structure and seepage channel was investigated to evaluate the dewatering performance of underflow slurry using a three-dimensional reconstruction approach. The results show that porosity decreases considerably under shearing. The connected-pore ratio and the average radius of the throat channel reach peak values of 0.79 and 31.38 μm, respectively, when shearing is applied for 10 min. However, the reverse seepage velocity and absolute permeability in the bed decrease to various extents after shearing. Meanwhile, the maximum flow rate reaches 1.537 μm/s and the absolute permeability increases by 14.16%. Shearing alters the formation process and the pore structure of the seepage channel. Isolated pores connect to the surrounding flocs to form branch channels, which then become the main seepage channel and create the dominant water-seepage flow channel.
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