磁铁矿尾矿砂作为建筑用砂试验研究  

Experimental Research of Magnetite Tailings Sand as Construction Sand

作　　者：李仲贤 刘奕岑 米瑞宇[1,2,3,4] 闵鑫 刘磊[5] 吴小文 刘艳改 房明浩[1,2,3,4] 黄朝晖 王林俊[5] LI Zhongxian;LIU Yicen;MI Ruiyu;MIN Xin;LIU Lei;WU Xiaowen;LIU Yangai;FANG Minghao;HUANG Zhaohui;WANG Linjun(School of Materials Science and Technology,China University of Geosciences(Beijing);National Lab-oratory of Mineral Materials;Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes;Engineering Research Center of Ministry of Education for Geological Carbon Storage and Low Carbon Utilization of Resources;Beijing Building Materials Academy of Sciences Research Co.,Ltd.)

机构地区：[1]中国地质大学(北京)材料科学与工程学院,北京市海淀区100083 [2]矿物材料国家专业实验室 [3]非金属矿物与固废资源材料化利用北京市重点实验室 [4]地质碳储与资源低碳利用教育部工程研究中心 [5]北京建筑材料科学研究总院有限公司

出　　处：《现代矿业》2025年第2期212-215,共4页Modern Mining

基　　金：国家重点研发计划项目(编号:2021YFC1910602)。

摘　　要：为解决承德地区铁尾矿资源丰富但利用率低的问题,考察了单一磁铁矿尾矿砂作为建筑用砂的可行性。将磁铁矿尾矿砂以20%、40%、60%、80%、100%不同比例替代标准砂制备水泥砂浆,分析了其物相组成、微观形貌及力学性能。结果表明,当磁铁矿尾矿砂替代比例为40%时,水泥砂浆的力学性能最优,28 d平均抗折强度达17.78 MPa,平均抗压强度达81.10 MPa。扫描电子显微镜分析显示,40%替代比例的水泥砂浆试样内部水化产物分布均匀,表现出良好的微观结构。然而,过高的替代比例会抑制水化反应,降低砂浆性能。研究还发现,7~14 d的强度增长较快,之后增速放缓。研究结果为铁尾矿在建筑材料中的应用提供了科学依据,不仅有助于环境保护和资源循环利用,还为固废资源化和可持续建设提供了技术支持。In order to solve the problem of abundant iron tailings resources but low utilization rate in Chengde area,the feasibility of using single magnetite tailings sand as construction sand is investigated.Ce-ment mortar is prepared by replacing standard sand with magnetite tailings sand in different proportions of 20%,40%,60%,80%,100%,and its phase composition,microstructure and mechanical properties are analyzed.The results show that when the replacement ratio of magnetite tailings sand is 40%,the mechani-cal properties of cement mortar are the best,the average flexural strength of 28 d is 17.78 MPa,and the av-erage compressive strength is 81.10 MPa.Scanning electron microscope analysis showed that the internal hy-dration products of cement mortar samples with 40%substitution ratio are evenly distributed and showed good microstructure.However,too high substitution ratio will inhibit the hydration reaction and reduce the performance of mortar.The study also found that the intensity of 7~14 d increased rapidly,and then the growth rate slowed down.The research results provide a scientific basis for the application of iron tailings in building materials,which not only contributes to environmental protection and resource recycling,but also provides technical support for sustainable construction.

关 键 词：单一磁铁矿 尾矿砂 水泥砂浆 建筑材料 

分 类 号：TD926.4[矿业工程—选矿] TU521.1[建筑科学—建筑技术科学]