土工基础

›› 2019, Vol. 33 ›› Issue (3): 347-350.

• 工程实录 • 上一篇    下一篇

电场作用下平果铝矿泥的沉降研究

胡跃发1,2 ，孙刚臣1,2 ，龚子龙1,2，晏航宇3   

  1. (1.广西岩土力学 与工程重点实验室，广西桂林 541004;2.桂林理工大学 土木与建筑工程学院，广西桂林 541004;3.玉林师范学院，广西玉林 537000）
  • 收稿日期:2018-09-11 修回日期:2018-09-27 出版日期:2019-06-20 发布日期:2019-08-16
  • 通讯作者: 孙刚臣（1978-），男，讲师，工学博士，研究方向为岩土工程。
  • 作者简介:胡跃发（1992-），男，硕士研究生，研究方向为岩土工程。
  • 基金资助:

    基金项目：国家自然科学基金项目（41062006）；广西自然科学基金项目（2017GXNSFAA198238）

Study on the Sedimentation of Aluminum Sludge from Pingguo Mine Under the Electric Field Action

HU Yuefa1,2, SUN Gangchen1,2, GONG Zilong1,2, YAN Hangyu3   

  1. (1.Guangxi Key Laboratory of Geomechanics and Geotechnical Engineering, Guilin 541004;
    2.College of Civil Engineering and Architecture, Guilin University of Technology, Guilin 541004;
    3.Yuling Normal University, Yulin 537000)
  • Received:2018-09-11 Revised:2018-09-27 Online:2019-06-20 Published:2019-08-16

摘要： 铝土矿尾矿泥是氧化铝生产过程中形成的高含水量泥浆，具有粒径小、比表面积大、含水率高、沉降难的特点。为研究铝土矿泥在外加电场下的沉降机理，通过外加电场对矿泥进行沉降试验，即在不同的直流电压条件下（0 V、9 V、12 V、24 V、36 V），对矿泥沉降过程中的上清液高度、瞬时沉降速度、沉降速度等数据进行实时记录，并对试验过程中矿泥出现的电泳现象，结合电泳理论知识从物理学角度对矿泥沉降机制进行探讨。试验结果表明：矿泥的沉降效果随电场强度的加强而相应增强；由于矿泥颗粒带负电荷，随着电场强度的增强，矿泥颗粒会加速向金属电极片正极移动；在给出的直流电压条件下（0 V、9 V、12 V、24 V、36 V）,24 V是分界点电压，48 V是该范围内的“上限电压”。

关键词: 矿泥 , 电场沉降, 上清液高度, 电泳 

Abstract: Bauxite tailing sludge is a high moisture content slurry formed in the process of alumina production, which has the characteristics of fine particle size, large specific surface area, high water content and difficult to settle in the suspension liquid. In order to further study the sedimentation mechanism of bauxite slurry under the applied electric field, the sedimentation tests of the sludge under different direct electric field (0V, 9V, 12V, 24V, 36V) were conducted. During the sediment of the aluminum sludge, the clear liquid height, transient and average sediment velocity of the particles were real-time monitored. The electrophoretic phenomenon in the aluminum sludge was also observed and its effect on the sedimentation of the mine sludge were also discussed. The results show that the sedimentation effect of the mud is enhanced with the increase of the electric field magnitude. Because of the negative charge of the mud particles, as the electric field magnitude increases, the particles of the mud will accelerate the movement of the anode to the metal electrode plate. Under a given DC voltage condition (0V, 9V, 12V, 24V, 36V), the voltage of 36V should be the threshold voltage and 48V is the "upper limit voltage" for the applied electric field.

Key words: Mine Sludge, Sediment of Mine Sludge Under the Electrical Field, Clear Liquid Height, Electrophoretic Phenomenon