煤气化粗渣基地质聚合物的热稳定性研究  

Research on thermal stability of coal gasification coarse slag based geopolymer

作　　者：吕政晔 张彤 刘泽[1] 王群英 王栋民[1] LüZhengye;Zhang Tong;Liu Ze;Wang Qunying;Wang Dongmin(School of Chemical and Environmental Engineering,China University of Mining and Technology-Beijing,Beijing 100083,China;Huadian Electric Power Research Institute Company,Hangzhou Zhejiang 310012,China)

机构地区：[1]中国矿业大学(北京)化学与环境工程学院,北京100083 [2]华电电力科学研究院有限公司,浙江杭州310012

出　　处：《矿业科学学报》2022年第5期595-603,共9页Journal of Mining Science and Technology

基　　金：国家重点研发计划(2019YFC1904302);宁夏回族自治区重点研发计划(2021BEG92002);国家自然科学基金联合基金(U20A20324)。

摘　　要：煤气化粗渣可以作为前驱体制备地质聚合物,其耐高温性需要进一步探究。本文分别对煤气化粗渣中掺入10%TiO_(2)、30%粉煤灰和30%矿渣制备的地质聚合物进行高温处理,探究在不同温度下4种28 d地质聚合物的热稳定性。结果表明,在100℃时,样品抗压强度与常温时相差不大;在200℃、400℃和800℃时,4种样品的抗压强度均出现不同程度的下滑,其中强度衰减最为明显的是掺入矿粉的样品,强度衰减较小的是掺入TiO_(2)的样品;随着温度的升高,地质聚合物出现了开裂现象,在100℃和200℃时仅煤气化粗渣地质聚合物有开裂现象,在400℃时仅掺入TiO_(2)的地质聚合物未开裂,在800℃时所有地质聚合物均开裂。掺入TiO_(2)的地质聚合物因含有锐钛矿而具有较好的耐高温性。Coal gasification crude slag can be used as a precursor to prepare geopolymer,and its high temperature resistance needs to be further explored.In this paper,geopolymers prepared by mixing 10%of TiO_(2),30%of fly ash and 30%of slag in coal gasification crude slag were treated at high temperature,and the thermal stability of four 28d geopolymers at different temperatures was explored.The results show that at 100℃,the compressive strength of the sample is not much different from that at room temperature.At 200℃,400℃and 800℃,the compressive strengths of the four samples all decreased to different degrees.The strength attenuation is most obvious in the samples doped with mineral powder,and the strength attenuation of the samples doped with TiO_(2) is smaller at high temperature.With the increase of temperature,the geopolymers cracked:at 100℃and 200℃,only the coal gasification coarse slag geopolymers cracked;at 400℃,the geopolymers only mixed with TiO_(2) did not crack;at 800℃,all geopolymers cracked.Geopolymers doped with TiO_(2) have better high temperature resistance due to the anatase content.

关 键 词：煤气化粗渣 碱激发 地质聚合物 热稳定性 力学性能 TiO_(2) 

分 类 号：TU52[建筑科学—建筑技术科学]