土工基础

土工基础 ›› 2023, Vol. 37 ›› Issue (4): 566-569.

• 工程实录 • 上一篇    下一篇

无机盐对铝矿泥沉降速率的影响——以广西平果铝尾矿泥为例

邓旭1，2，孙刚臣1，2，张喜伟1，2，龚子龙3，何建波1，2   

  1. （1.桂林理工大学土木与建筑工程学院，广西桂林 541004；2.广西绿色建材与建筑工业化重点实验室，广西桂林 541004；3.深圳市勘察测绘院(集团)有限公司，广东深圳 518000）
  • 收稿日期:2021-12-06 修回日期:2022-03-11 出版日期:2023-08-31 发布日期:2023-09-01
  • 通讯作者: 孙刚臣（1977-），男，高级工程师，工学博士，研究方向为岩土工程。
  • 作者简介:邓旭（1996-），男，硕士研究生，研究方向为岩土工程。
  • 基金资助:
    广西自然科学基金项目（2020GXNSFAA297078）；广西建筑新能源与节能重点实验室开放基金（桂科能19-J-21-26）；桂林理工大学科研启动基金（GUTQDJJ2003031）〖ZK)〗

Effect of Inorganic Salts on the Sedimentation Rate of an Aluminum SlimeCase History of the Pingguo Aluminum Tailings Slurry

DENG Xu1,2, SUN Gangchen1,2, ZHANG Xiwei1,2, GONG Zilong3， HE Jianbo1,2   

  1. (1.Civil and Architectural Engineering College, Guilin University of Technology, Guilin 541004； 2.Guangxi Key Laboratory of Green Building Materials and Construction Industrialization, Guilin 541004； 3.Shenzhen Geotechnical Investigation & Surveying Institute (Group) Co. Ltd., Shenzhen 518000)
  • Received:2021-12-06 Revised:2022-03-11 Online:2023-08-31 Published:2023-09-01

摘要： 广西平果铝尾矿泥浆具有具有粒径小、带电、比表面积大、含水率高、沉降困难、含有Al3+杂质等特点。由于平果铝矿泥颗粒间带电，矿泥颗粒间的范德华力作用对其沉降具有较大的影响，而无机盐在水中的电离会对矿泥的电层厚度产生一定的影响，进而影响矿泥的沉降速度。选取常见的无机盐NaCl加入矿泥浆并充分搅拌，根据矿泥上清液高度沉降时间关系分析加入NaCl对矿泥浆沉降速率的影响。结果表明：矿泥的沉降存在三个阶段：湍流影响阶段、主要沉降阶段、次要沉降阶段，且随着加入NaCl浓度的上升，矿泥浆沉降速率逐渐降低。

关键词: 铝矿泥浆, 沉降, 无机盐

Abstract: Guangxi Pingguo aluminum tailings slurry has the characteristics of small particle size, electric charged, large specific surface area, high water content, difficult to settle, and containing Al3+ impurities. As Pingguo aluminum slime particles charged, the Van der Waals force in the mine slurry particles has a great influence on its sedimentation, and the ionization of the inorganic salt will have an impact on the thickness of the electric layer, and then affect the slurry of the sedimentation rate. In this paper, a common inorganic salt, NaCl, was selected to be added into the slurry and fully stirred. The influence of adding the NaCl on the sedimentation rate of the slurry was analyzed according to the relationship between the height and the settling time of the supernatant of the slurry. The results show that there are three stages of the slime sedimentation: the turbulence influence stage, the main settling stage and the secondary settling stage. With the increase of the NaCl concentration, the rate of the slurry gradually decreased.

Key words: Aluminum Slurry, Sedimentation, Inorganic Salt

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