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絮凝沉降对浓缩超细尾砂料浆屈服应力的影响

阮竹恩 吴爱祥 王贻明 王勇 王建栋

阮竹恩, 吴爱祥, 王贻明, 王勇, 王建栋. 絮凝沉降对浓缩超细尾砂料浆屈服应力的影响[J]. 工程科学学报. doi: 10.13374/j.issn2095-9389.2020.08.01.002
引用本文: 阮竹恩, 吴爱祥, 王贻明, 王勇, 王建栋. 絮凝沉降对浓缩超细尾砂料浆屈服应力的影响[J]. 工程科学学报. doi: 10.13374/j.issn2095-9389.2020.08.01.002
RUAN Zhu-en, WU Ai-xiang, WANG Yi-ming, WANG Yong, WANG Jian-dong. Effect of flocculation sedimentation on the yield stress of thickened ultrafine tailings slurry[J]. Chinese Journal of Engineering. doi: 10.13374/j.issn2095-9389.2020.08.01.002
Citation: RUAN Zhu-en, WU Ai-xiang, WANG Yi-ming, WANG Yong, WANG Jian-dong. Effect of flocculation sedimentation on the yield stress of thickened ultrafine tailings slurry[J]. Chinese Journal of Engineering. doi: 10.13374/j.issn2095-9389.2020.08.01.002

絮凝沉降对浓缩超细尾砂料浆屈服应力的影响

doi: 10.13374/j.issn2095-9389.2020.08.01.002
基金项目: 国家自然科学基金重点资助项目(51834001);国家自然科学基金面上资助项目(51674012);国家自然科学基金青年科学基金资助项目(51804015);中央高校基本科研业务费专项资金资助(06500121)
详细信息
    通讯作者:

    E-mail:wuaixiang@126.com

  • 中图分类号: TD853

Effect of flocculation sedimentation on the yield stress of thickened ultrafine tailings slurry

More Information
  • 摘要: 深锥浓密机内底部料浆的屈服应力过高容易导致压耙,为此通过对不同絮凝沉降条件下获得的浓缩超细尾砂料浆的屈服应力进行原位测量,并通过对絮凝前后料浆总有机碳的测试来分析超细尾砂颗粒表面的絮凝剂吸附量,进而分析了絮凝沉降对浓缩超细尾砂料浆屈服应力的影响规律。研究发现,絮凝沉降对浓缩超细尾砂料浆的屈服应力有显著影响,pH和絮凝剂单耗通过影响尾砂颗粒表面的絮凝剂吸附量进而影响浓缩超细尾砂料浆的屈服应力,屈服应力随着pH和絮凝剂单耗的增大均不断增大。综合考虑尾砂料浆的絮凝沉降效果和所得浓缩超细尾砂料浆的屈服应力,最佳絮凝条件是pH值为11和絮凝剂单耗为15 g·t−1,在此最优条件下料浆固液界面的初始沉降速率为0.4565 mm·s−1,沉降后上清液浊度为143 NTU,底部沉积尾砂料浆的固相质量分数为51.56%、屈服应力为243.18 Pa。初步建立了适用于超细人造尾砂的基于絮凝剂吸附量的屈服应力模型,屈服应力随尾砂颗粒表面单位面积的絮凝剂吸附量的增大而增大,为实际生产中控制全尾砂絮凝沉降参数提供参考。

     

  • 图  1  实验过程

    Figure  1.  Schematic of experiment process

    图  2  絮凝条件对絮凝沉降的影响。(a)pH;(b)絮凝剂单耗

    Figure  2.  Effects of conditions on flocculation and settling: (a) pH; (b) flocculant dosage

    图  3  絮凝条件对絮凝剂吸附效率的影响。(a)pH;(b)絮凝剂单耗。

    Figure  3.  Effects of conditions on efficiency of flocc adsorption: (a) pH; (b) flocculant dosage

    图  4  絮凝条件对屈服应力的影响。(a)pH;(b)絮凝剂单耗

    Figure  4.  Effects of conditions on yield stress: (a) pH; (b) flocculant dosage

    图  5  絮凝剂吸附对屈服应力的影响

    Figure  5.  Effects of flocculant adsorption on yield stress

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  • 收稿日期:  2020-08-01
  • 网络出版日期:  2020-12-30

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