摘要
赤泥作为矿山充填材料可解决其堆存问题,但矿井水中金属离子和酸根离子会侵蚀充填体,影响其稳定性。以补连塔矿和寸草塔矿为背景进行室内模拟试验,采用抗侵蚀系数表征矿井水对充填体抗压强度的影响,确定原材料的最佳配合比。分析充填体在矿井水中抗压强度的变化规律,通过抗压强度折损率、表观破坏路径等指标评价矿井水对充填体的侵蚀程度,并结合扫描电镜和能谱分析等测试手段,揭示矿井水对充填体的微观作用机理。结果表明:料浆质量浓度为56%,赤泥、煅烧高岭土、水泥的配合比为5∶4∶1时,试件28d抗压强度为1.98 MPa,料浆的初始流动度为260 mm,满足充填体性能要求且实现了赤泥的大规模消纳;经硫酸和氢氧化钠溶液浸泡28 d后的试件抗压强度较纯水浸泡条件下分别下降7.3%和2.8%,对应的抗侵蚀系数分别为0.92和0.97;微观测试结果显示,充填体长期处于酸碱环境中,Si—O—Al键断裂,凝胶解聚,导致充填体抗压强度逐渐降低。研究结果可为赤泥基充填材料在矿井水中的工程应用提供理论参考。
Red mud as mine filling materials can solve the storage problems,but metal ions and acid ions in mine water will corrode the filling body and affect their stability.Indoor simulation tests were conducted based on the backgrounds of Bulianta Mine and Cuncaota Mine,and the impact of mine water on the compressive strength of the filling material was characterized by the erosion resistance coefficient to determine the optimal ratio of raw materials.The variation law of compressive strength of the filling body in mine water was analyzed,and the degree of erosion of the filling body by mine water was evaluated through indicators such as compressive strength loss rate and apparent failure path.Combining with testing methods such as scanning electron microscopy and energy dpectrum analysis,the micro mechanism of the action of mine water on the filling body was revealed.The results show that when the mass concentration of the slurry is 56%and the ratio of red mud,calcined kaolin,and cement is 5∶4∶1,the compressive strength of the specimen at 28 d is 1.98 MPa,and the initial flowability of the slurry is 260 mm,which meets the performance requirements of the filling body and achieves large-scale consumption of red mud.After soaking in sulfuric acid and sodium hydroxide solutions for 28 d,the compressive strength of the specimens decreases by 7.3%and 2.8%respectively compared to pure water immersion conditions,with corresponding corrosion resistance coefficients of 0.92 and 0.97,respectively.The microscopic test results show that the filling body has been in an acid-base environment for a long time,the Si—O—Al bond is broken,and the gel is depolymerized,leading to the gradual reduction of the compressive strength of the filling body.This research can provide a theoretical reference for the engineering application of red mud-based filling materials in mine water.
作者
宋永明
李驰
高瑜
王晓荣
SONG Yongming;LI Chi;GAO Yu;WANG Xiaorong(School of Civil Engineering,Inner Mongolia University of Technology,Hohhot,Inner Mongolia 010051,China;School of Resources and Environmental Engineering,Inner Mongolia University of Technology,Hohhot,Inner Mongolia 010051,China;Inner Mongolia Engineering Research Center of Geological Technology and Geotechnical Engineering,Inner Mongolia University of Technology,Hohhot,Inner Mongolia 010051,China;Key Laboratory of University of Geological Hazards and Geotechnical Engineering Defense in Sandy,Drought and Cold Regions,Hohhot,Inner Mongolia 010051,China)
出处
《矿业研究与开发》
北大核心
2025年第1期103-111,共9页
Mining Research and Development
基金
国家自然科学基金项目(52378348,12262031)
内蒙古自治区科技计划项目(2021GG0344)
内蒙古自治区自然科学基金青年基金项目(2023QN04016)。
关键词
矿井水
赤泥基充填材料
抗压强度
酸碱侵蚀
抗侵蚀系数
Mine water
Red mud-based filling material
Compressive strength
Acid alkali erosion
Anti-erosion coefficien
