Development and Heavy Metal Solidification of Lead Smelting Slag-based Ecological Cementitious Materials
LIU Wenhuan1,2, HU Jing1, ZHAO Zhongzhong1, DU Renhao1, WAN Yongfeng1, LEI Fan1, LI Hui1,2,*
1 College of Materials Science and Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China 2 Ecological Cement Engineering Research Center of Ministry of Education, Xi'an 710055, China
Abstract: Lead smelting slag (LSS) is a hazardous waste containing heavy metals (Cr, Ni, Cu, Zn, As, and Pb), and its improper disposal can cause irreversible harm to the ecosystem. In this study, the ecological cementitious materials were prepared by using lime ash slag (LAS), bischofite (BF), slag powder (SP) and proper amount of cement (CM) co-excited LSS. The ideal cementitious material ratio was discovered through orthogonal tests, and the effects of various variables on the compressive strength of ecological cementitious materials were discussed. XRD, SEM, FTIR, and the sulfuric acid nitrate method were used to examine the properties of the cementitious materials' hydration products as well as the leaching law of heavy metals. The results show that when the mass ratio of LSS to cement is 3∶1, and the external admixture of lime ash slag, bischofite and mineral powder is 20%, 10% and 10% of the sum of the mass of LSS and cement respectively, the compressive strength of the prepared ecological cementitious material is optimal, and the 28 d compressive strength reaches 40.9 MPa, and the admixture of mineral powder is the first factor affecting its compressive strength. Microscopic analysis shows that the hydration products of the cementitious material are mainly Friedel's salt, calcite, C-S-H and C/M-A-S-H, which are interlinked to form a dense spatial network structure, which help to improve the mechanical properties of the cementitious material. The cementation solidification ratio of the cementitious material for the main heavy metals is greater than 83%, and the leaching solution concentration of heavy metals meets the requirements of the sanitary standard for domestic drinking water (GB5749-2006).
通讯作者: *李辉,教授、博士研究生导师。1994年西安建筑科技大学材料科学与工程专业本科毕业,1997年西安建筑科技大学材料学专业硕士毕业后到西安建筑科技大学工作至今,2009年西安建筑科技大学材料学专业博士毕业。主要从事固体废弃物的资源化利用及新型水泥基材料的低碳制备等方面的研究工作。近年来发表论文100余篇,包括Chemical Engineering Journal、Journal of Hazardous Materials、Journal of Cleaner Production、Environmental Chemistry Letters、Construction and Building Materials、《硅酸盐学报》《建筑材料学报》《材料导报》等,2017年曾荣获国家科技进步二等奖。
作者简介: 刘文欢,西安建筑科技大学材料科学与工程学院副教授、硕士研究生导师。2004年西安建筑科技大学材料科学与工程专业本科毕业,2007年西安建筑科技大学材料学专业硕士毕业后到西安建筑科技大学工作至今,2019年西安建筑科技大学材料学专业博士毕业。目前主要从事生态建筑材料、固体废弃物的资源化利用等方面的研究工作。近年来发表论文20余篇,包括Journal of Cleaner Production、Case Studies in Construction Materials、《建筑材料学报》《材料导报》等。
引用本文:
刘文欢, 胡静, 赵忠忠, 杜任豪, 万永峰, 雷繁, 李辉. 铅冶炼渣基生态胶凝材料的研发及重金属固化[J]. 材料导报, 2024, 38(6): 22120057-8.
LIU Wenhuan, HU Jing, ZHAO Zhongzhong, DU Renhao, WAN Yongfeng, LEI Fan, LI Hui. Development and Heavy Metal Solidification of Lead Smelting Slag-based Ecological Cementitious Materials. Materials Reports, 2024, 38(6): 22120057-8.
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2024, Vol. 38 
