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煅烧锂渣基地质聚合物的微观结构及性能研究
作者：韩乐，刘泽，张延博，王吉祥，谢福助
[中国矿业大学（北京） 化学与环境工程学院混凝土与环境材料研究所，北京 100083]
摘要：以700 ℃煅烧锂渣（CLS）为原料制备煅烧锂渣基地质聚合物，研究不同硅铝比、氢氧化钠浓度对锂渣基地质聚合物性能及微观结构的影响。结果表明：当硅铝比为2.9、氢氧化钠浓度为3.5 mol/L时，煅烧锂渣基地质聚合物的强度较高，1、3、7、28 d抗压强度分别为59.0、46.8、57.8、71.3 MPa；煅烧锂渣基地质聚合物的主要产物为N-A-S-H凝胶，体系微观呈片状凝胶层层堆积的密实结构。
关键词：煅烧锂渣；碱激发；力学性能；微观形貌；红外分析
中图分类号：TU526 文献标识码：A 文章编号：1001-702X（2020）06-0009-05
Microstructure and properties of calcined lithium slag-based geopolymers
HAN Le，LIU Ze，ZHANG Yanbo，WANG Jixiang，XIE Fuzhu
（Research Institution of Concrete and Eco-Materials，School of Chemical and Environmental Engineering，China University of Mining and Technology-Beijing，Beijing 100083，China）
Abstract：In this study，lithium slag-based geopolymer were prepared by calcining lithium slag at 700 ℃. The effects of different Si/Al ratios and NaOH concentrations on the properties and microstructures of lithium slag-based geopolymer were studied. The results show that while the Si/Al ratio is 2.9，and the concentration of sodium hydroxide is 3.5 mol/L，the base polymer of lithium slag reaches higher strength. It reveals that calcining lithium slag based geopolymer exhibit compressive strength of 59.0 MPa，46.8 MPa，57.8 MPa and 71.3 MPa at 1 d，3 d，7 d and 28 d respectively. The main product of the calcined lithium slag base polymer is N-A-S-H gel，the system microscopically is dense structure of sheet gel layer.
Key words：calcining lithium slag，alkali activation，mechanical properties，microstructure，FTIR analysis