活化煤矸石地质聚合物的制备与性能研究

硅酸盐通报 ›› 2021, Vol. 40 ›› Issue (3): 914-920.

活化煤矸石地质聚合物的制备与性能研究

王菲, 刘泽, 韩乐, 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

收稿日期:2020-10-10 修回日期:2020-12-09 出版日期:2021-03-15 发布日期:2021-04-13
通讯作者: 刘泽,博士,教授。E-mail:lzk1227@sina.com
作者简介:王菲(1995—),女,硕士研究生。主要从事无机非金属材料研究。E-mail:wangf810@outlook.com
基金资助:
国家重点研发计划(2019YFC1904300);国家自然科学基金联合基金项目(U20A20324);宁夏回族自治区重点计划计划(2020BCE01001);中国矿业大学(北京)越崎青年学者基金(2019QN10)

Preparation and Properties of Activated Coal Gangue Geopolymer

WANG Fei, LIU Ze, HAN Le, 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

Received:2020-10-10 Revised:2020-12-09 Online:2021-03-15 Published:2021-04-13

摘要/Abstract

摘要： 对原状煤矸石进行了定性和定量双重分析,优化了煤矸石活化的煅烧温度,探究了钠铝比(n(Na)/n(Al)=0.52、0.57、0.62)和激发剂模数(M=0.66、0.69、1.32、1.65)对活化煤矸石地质聚合物抗压强度和微观结构的影响。利用XRD、FT-IR和SEM对活化煤矸石地质聚合物的微观结构进行了分析表征。结果表明,高温活化煤矸石有助于激发煤矸石中的活性组分,在煅烧温度为600 ℃时,高岭岩相完全消失,“鼓包峰”面积相对较大,可用于制备活化煤矸石地质聚合物。n(Na)/n(Al)的提高促进了地质聚合反应的进行,抗压强度也随之提高,同时随着激发剂模数的增加,抗压强度也随之增加。当n(Na)/n(Al)为0.62,激发剂模数为1.65时,试样7 d的抗压强度可达到52 MPa。活化煤矸石地质聚合物的聚合产物主要为水化硅铝酸钠(N-A-S-H)凝胶,水化产物致密,性能优良。

关键词: 煅烧温度, 煤矸石, 地质聚合物, 材料强度, 微观结构

Abstract: The original coal gangue was analyzed both qualitatively and quantitatively, the calcination temperature of activated coal gangue was optimized, and the effects of sodium-aluminum ratio (n(Na)/n(Al)=0.52, 0.57, 0.62) and the activator modulus (M=0.66, 0.69, 1.32, 1.65) on the compressive strength and microstructure of activated coal gangue geopolymer were investigated. The microstructure of activated coal gangue geopolymer was characterized by XRD, FT-IR and SEM. The results show that activated coal gangue at high temperature is helpful to activate the active components in coal gangue. When the calcination temperature is 600 ℃, the kaolinite facies disappears completely and “the bulge peak” area is relatively large, which can be used to prepare activated coal gangue geopolymer. The increase of n(Na)/n(Al) promots the geopolymer reaction, and the compressive strength is also increased. Meanwhile, the compressive strength is also increased with the increase of the excitation modulus. When n(Na)/n(Al) is 0.62 and the activator modulus is 1.65, the compressive strength of the sample on 7 d reaches to 52 MPa. The product of activated coal gangue geopolymer is sodium silicate hydrate (N-A-S-H) gel, the hydration product is compact and has good performance.

Key words: calcination temperature, coal gangue, geopolymer, material strength, microstructure

中图分类号:

TU52

王菲, 刘泽, 韩乐, 谢福助. 活化煤矸石地质聚合物的制备与性能研究[J]. 硅酸盐通报, 2021, 40(3): 914-920.

WANG Fei, LIU Ze, HAN Le, XIE Fuzhu. Preparation and Properties of Activated Coal Gangue Geopolymer[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(3): 914-920.

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