低浓度全尾砂充填材料泌水及其调控机理

doi:10.11901/1005.3093.2020.034

材料研究学报

2020, Vol. 34

Issue (7): 481-488 DOI: 10.11901/1005.3093.2020.034

研究论文

本期目录 | 过刊浏览

低浓度全尾砂充填材料泌水及其调控机理

周在波¹, 刘娟红¹^,²^,³(

), 吴瑞东¹(

), 吴爱祥¹^,³, 王洪江¹^,³, 王少勇¹^,³

1.北京科技大学土木与资源工程学院北京 100083
2.北京科技大学城市地下空间工程北京市重点实验室北京 100083
3.北京科技大学金属矿山高效开采与安全教育部重点实验室北京 100083

Analysis of Bleeding of Low Concentration Full Tailings Filling Material and Its Regulate-control

ZHOU Zaibo¹, LIU Juanhong¹^,²^,³(

), WU Ruidong¹(

), WU Aixiang¹^,³, WANG Hongjiang¹^,³, WANG Shaoyong¹^,³

1.College of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China
2.Beijing Key Laboratory of Urban Underground Space Engineering, University of Science and Technology Beijing, Beijing 100083, China
3.State Key Laboratory of High-efficient Mining and Safety of Metal Mines, Ministry of Education, University of Science and Technology Beijing, Beijing 100083, China

引用本文:

周在波, 刘娟红, 吴瑞东, 吴爱祥, 王洪江, 王少勇. 低浓度全尾砂充填材料泌水及其调控机理[J]. 材料研究学报, 2020, 34(7): 481-488.
Zaibo ZHOU, Juanhong LIU, Ruidong WU, Aixiang WU, Hongjiang WANG, Shaoyong WANG. Analysis of Bleeding of Low Concentration Full Tailings Filling Material and Its Regulate-control[J]. Chinese Journal of Materials Research, 2020, 34(7): 481-488.

全文: PDF(8533 KB) HTML

摘要:

针对低浓度全尾砂充填过程中的泌水造成输送堵管充填体强度不均匀和体积沉缩等问题，进行尾砂级配、胶凝材料用量、料浆浓度、固水材料掺量的正交实验，分析了各种因素对泌水率的影响，根据电阻率(ER)测试、SEM-EDS和XRD探讨了固水材料的作用机理。结果表明，充填料浆的泌水率随着尾砂细颗粒、胶砂比、浓度和固水材料掺量的增加而降低，料浆的浓度和固水材料掺量对泌水率的影响最显著。添加5%的固水材料可使充填材料泌水率降低10%，初始粘度降低30%，2 h粘度降低53%，28 d抗压强度提高20%。固水材料可改善充填材料的孔隙率，提高充填材料水化体系的SO₄^2-浓度和pH值，生成钙矾石、斜方钙沸石以及C-S-H凝胶和硅铝酸盐凝胶的混合物，消耗大量自由水，高分子聚合物通过分子缠绕提高了体系的稳定性，改善了充填材料的泌水现象。

关键词 ：复合材料, 固水材料, 正交实验, 泌水率, 微观机理

Abstract：

It is known that the bleeding phenomenon during the paste filling of the low concentration full tailings may result in the blocking of pipes, afterwards, the inhomogeneous distribution of strength and volume shrinkage of the filling body. For solving the above problems, orthogonal tests were designed for revealing the effect of tailing gradation, amount of binding material, slurry concentration and content of anti-bleeding material on bleeding rate by means of electrical resistivity test (ER), SEM-EDS and XRD. The results show that the bleeding rate of filling materials is inversely proportional to the tailing gradation, amount of binding material, slurry concentration and the content of anti-bleeding material. The concentration of slurry and the content of water solidifier had a great influence on the bleeding rate. By adding 5% anti-bleeding material equivalent to the total amount of glue-powder, the initial viscosity reduced by 30%, the 2 h viscosity reduced by 53%, the bleeding rate can be reduced by 10% and the 28 d compressive strength increased by 20% for the filling body. The anti-bleeding material improves the porosity of the, increases the concentration of SO₄^2- and pH value of the hydration system of the filling body, as well as generates ettringite, trapezium, C-S-H gel and silicoaluminate gel, which consumed a lot of free water, improves system stability by entangling molecules so that improves the bleeding situation for the filling body.

Key words： composite anti-bleeding material orthogonal tests bleeding rate microscopic mechanism

收稿日期: 2020-01-28

ZTFLH:

TG142

基金资助:国家自然科学基金(51834001)

作者简介: 周在波，男，1992年生，博士

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https://www.cjmr.org/CN/10.11901/1005.3093.2020.034 或 https://www.cjmr.org/CN/Y2020/V34/I7/481

表1 不同材料氧化物分析(质量分数, %)

图1 试验材料的尾砂粒径分析和胶固粉的矿物分析

表2 L9(34)泌水率正交实验结果

图2 泌水率正交实验结果分析

图3 固水材料对充填材料流变性能、抗压强度和泌水率的影响

图4 充填材料在管道输送过程示意图(1)泌水示意图，(2)固水材料作用原理

图5 M0G0与M0G1试验组不同龄期的电阻率

图6 固水材料添加前后不同龄期的SEM微观分析

图7 添加固水材料后水化28 d不同点位的能谱分析

图8 水化产物的对比分析

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