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Volume 29 Issue 12
Dec.  2022
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文章导航 >  矿物冶金与材料学报（英文）  > 2022  >  29(12): 2126-2135
Huazhe Jiao, Weilin Chen, Aixiang Wu, Yang Yu, Zhuen Ruan, Rick Honaker, Xinming Chen, and Jianxin Yu, Flocculated unclassified tailings settling efficiency improvement by particle collision optimization in the feedwell, Int. J. Miner. Metall. Mater., 29(2022), No. 12, pp. 2126-2135. https://doi.org/10.1007/s12613-021-2402-3
Cite this article as:
Huazhe Jiao, Weilin Chen, Aixiang Wu, Yang Yu, Zhuen Ruan, Rick Honaker, Xinming Chen, and Jianxin Yu, Flocculated unclassified tailings settling efficiency improvement by particle collision optimization in the feedwell, Int. J. Miner. Metall. Mater., 29(2022), No. 12, pp. 2126-2135. https://doi.org/10.1007/s12613-021-2402-3
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研究论文封面文章

通过进料口中颗粒碰撞优化提高絮凝未分级尾矿沉降效率

  • 1)

    河南理工大学土木工程学院，焦作 454003

  • 2)

    北京科技大学土木与资源工程学院，北京 100083

  • 3)

    河南理工大学测绘与国土信息工程学院，焦作 454000

  • 4)

    中国地质环境监测院，北京 100081

  • 5)

    煤炭安全生产与清洁高效利用省部共建协同创新中心，焦作 454150

  • 6)

    肯塔基大学采矿工程学院，莱克星顿 40506

  • 通讯作者:

    余洋    E-mail: yuyang2005@139.com

    阮竹恩    E-mail: ustb_ruanzhuen@hotmail.com

  • 尾矿的高效浓缩是金属矿山尾矿回填和表面处理作业的先决条件。悬浮液中的超细尾矿颗粒与絮凝剂分子的有效碰撞对于絮体团聚体的形成和沉降至关重要。加料速度和絮凝剂添加方法不合理，会导致絮凝剂不能有效分散，浓缩机溢流中颗粒含量高。本文分析了紊流强度和絮凝剂添加方式对絮凝体大小、强度和运动特性的影响。为了解决浊度增加的问题，进行了中试连续浓缩试验。以全尾砂的单个颗粒和多个絮体为研究对象，建立了絮体的颗粒迭代沉降模型。通过跟踪和模拟粒子轨迹，研究了湍流强度对碰撞效果的影响。结果表明，在单颗粒沉降过程中，由于微观作用引起的颗粒粘附，在迭代过程中出现混沌现象。当紊流强度为25.99%时，尾矿絮体的最大粒径为6.21 mm，最大沉降速率为5.284 cm·s−1。尾矿絮体在受阻沉降时呈现出颗粒力链系统的多尺度结构，强弱力链的交织构成了颗粒的拓扑结构。将研究结果应用于某厂浓缩池，优化了絮凝剂的投加方式和投加速度，提高了絮凝剂沉降速度和溢流澄清度。
    • Research Article

    Flocculated unclassified tailings settling efficiency improvement by particle collision optimization in the feedwell

    + Author Affiliations
      Abstract
    • Efficient thickening of tailings is a prerequisite for the metal mine tailings backfill and surface disposal operation. The effective collision of ultrafine tailings particles in suspension with flocculant molecules is essential for flocs aggregates formation and settling. Unreasonable feeding speed and flocculant adding method will lead to the failure of effective dispersion of flocculant and high particle content in thickener overflow. In this work, the effect of turbulence intensity and flocculant adding method on floc size, strength, and movement characteristics are analysed. Aiming to solve the turbidity increased, a pilot-scale continuous thickening test was carried out. Taking a single particle and multiple flocs of full tailings as the research object, the particle iterative settlement model of flocs was established. The influence of turbulence intensity on collision effect is studied by tracking and simulating particle trajectory. The results show that in the process of single particle settlement, chaos appears in the iterative process owing to particle adhesion which caused by micro action. When the turbulence intensity is 25.99%, the maximum particle size of tailings floc is 6.21 mm and the maximum sedimentation rate is 5.284 cm·s−1. The tailings floc presents a multi-scale structure of particle-force chain system when hindered settling, and the interweaving of strong and weak force chains constitutes the topological structure of particles. The results are applied to a thicker in plant, the flocculant addition mode and feed rate are optimized, and the flocs settling speed and overflow clarity are improved.
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