自然科学版 英文版
自然科学版 英文版
自然科学版 英文版
自然科学版 英文版
英文版编委
自然科学版 英文版
英文版首届青年编委

您目前所在的位置:首页 - 期刊简介 - 详细页面

中南大学学报(自然科学版)

Journal of Central South University

第50卷    第7期    总第299期    2019年7月

[PDF全文下载]    [Flash在线阅读]

    

文章编号:1672-7207(2019)07-1670-07
絮团稠化对全尾砂浓密性能的影响
周旭1, 2, 3,王洪江1, 2,吴爱祥1, 2,曹炎森1, 2,牛鹏1, 2

(1. 北京科技大学 土木与资源工程学院,北京,100083;
2. 金属矿山高效开采与安全教育部重点实验室,北京,100083;
3. 鑫达金银开发中心,北京,100038
)

摘 要: 基于全尾砂浓密过程料浆质量分数高,尾矿絮团无法直接观测,而取样稀释再进行测试分析难以避免误差,借助FBRM和PVM实时在线监测和分析系统,观测全尾砂浓密过程耙架剪切应力和重力耦合作用下絮团颗粒结构和粒度的变化。研究结果表明:在泥层高度分别为25,45和70 cm的3个全尾砂浓密阶段内均保持耙架转速为15 r/min的试验条件下,直径在100 μm以上的絮团逐渐破裂重构而数量减少,直径在10 μm以下絮团数量相应增加,松散的大絮团逐渐演化成为密实的小絮团;絮团有效直径随剪切时间延长和泥层高度增加而减小,絮团稠化速程度随泥层高度上升而加快;有效干涉沉降系数是基于絮团有效直径的函数,随剪切时间延长和泥层高度增加呈现先增大后稳定的趋势。

 

关键词: 泥层高度;絮团稠化;絮团有效直径;有效干涉沉降系数

Effects of aggregate densification on unclassified tailings thickening performance
ZHOU Xu1, 2, 3, WANG Hongjiang1, 2, WU Aixiang1, 2, CAO Yansen1, 2, NIU Peng1, 2

1. School of Civil and Resources Engineering, University of Science and Technology Beijing, Beijing 100083, China;
2. Key Laboratory of Ministry of Education for Efficient Mining and Safety of Metal Mines, Beijing 100083, China;
3. Xinda Gold and Silver Development Center, Beijing 100038, China

Abstract:Due to the high concentration of unclassified tailings slurry thickening process, flocculated aggregates of tailings particles can’t be directly observed, and the deviation of sampling and diluted analyzing is unavoidable. Based on focused beam reflectance measurement (FBRM) and particle vision microscope (PVM) real-time online monitoring and analysis system, the study of aggregate densification under rake shear stress coupled with gravity during unclassified tailings thickening process was accomplished. The results show that in three thickening test stages of mud bed height 25, 45 and 70 cm with the same rake shear ratio 15 r/min, the amount of aggregates diameter over 100 μm decreases, while the amount of aggregates diameter under 10 μm increases, because the large and loosen aggregates are reconstructed and deformed into small and denser aggregates. Effective aggregate diameter decreases as shear time mud bed height increases, and the aggregate densification accelerates with mud bed height rises. As the function of effective aggregate diameter, the effective hinder settling factor rapidly increases first and then becomes stable when shear time increase and mud bed height rises.

 

Key words: mud bed height; aggregate densification; effective aggregate diameter; effective hindered settling coefficient

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
版权所有:《中南大学学报(自然科学版、英文版)》编辑部
地 址:湖南省长沙市中南大学 邮编: 410083
电 话: 0731-88879765(中) 88836963(英) 传真: 0731-88877727
电子邮箱:zngdxb@csu.edu.cn 湘ICP备09001153号