Settling velocity variation of mud layer and particle settling characteristics in thickening of tailings

被引：8

作者：

Hou H. ^{[1
,2
]}

Li C. ^{[1
,2
]}

Wang S. ^{[1
,2
]}

Yan B. ^{[1
,2
]}

机构：

[1] School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing

[2] State Key Laboratory of High-efficient Mining and Safety of Metal Mines, Ministry of Education, Beijing

来源：

Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) | 2019年 / 50卷 / 06期

基金：

中国国家自然科学基金;

关键词：

Flocculation sedimentation; Micro observation; Settling characteristics; Settling velocity; Tailings;

D O I：

10.11817/j.issn.1672-7207.2019.06.022

中图分类号：

学科分类号：

摘要：

Through the macroscopic test of flocculation sedimentation of total tailings, the experiment of different slurry mass fraction and flocculant consumption was carried out to analyze settling velocity variation of mud layer. The regularity curve of flocculation sedimentation velocity of total tailings was obtained based on the corresponding relationship between sedimentation stage and sedimentation velocity of mud layer. The micro-test of tailings particles in different settling areas was carried out, and the samples were observed by environmental scanning electron microscope(ESEM). The particle size distribution in different settling areas was analyzed, and the settling characteristics of different particle size tailings were investigated. The results show that there are differences in the distribution of sedimentation particles in different regions. During the formation, transition and disappearance of different settling areas, the curve of settling velocity of tailings flocculation can be divided into five stages: the front section of free settlement, the last section of free settlement, the front section of interference settlement, the last section of interference settlement and the compaction section. It is found that the settling velocity is closely related to the particle size. The particles with diameter above 82.0 μm do not flocculate and settle in the form of particles to the bottom, the particles with diameter between 26.5 and 82.0 μm are hard to flocculate, the particles with diameter between 10.0 and 26.5 μm are not easy to flocculate and the particles with diameter below 10.0 μm are easy to flocculate and settle in the form of flocs. © 2019, Central South University Press. All right reserved.

引用

页码：1428 / 1436

页数：8

共 24 条

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