碱激发热改性煤矸石基注浆材料性能研究  

Study on Properties of Alkali-Activated and Thermal Modification Coal Gangue-Based Grouting Material

作　　者：王鑫 王开[1] 张世玉 WANG Xin;WANG Kai;ZHANG Shiyu(College of Mining Engineering,Taiyuan University of Technology,Taiyuan,Shanxi 030024,China)

机构地区：[1]太原理工大学矿业工程学院,山西太原030024

出　　处：《矿业研究与开发》2024年第12期264-272,共9页Mining Research and Development

基　　金：国家自然科学基金青年项目(52304148);山西省基础研究计划青年项目(202203021212262);山西省自然科学研究面上项目(20210302123147)。

摘　　要：为了增加煤矸石在注浆材料中的使用,对活化后煤矸石基注浆材料的活性和性能进行研究,分析了活化温度、煤矸石占比、化学激发剂对热改性煤矸石基注浆材料在流动性能、凝结时间、抗压强度等方面的影响。采用X射线荧光光谱法(XRF)、X射线衍射分析法(XRD)分析了热活化前后煤矸石材料物相,并使用电感耦合等离子体发射光谱仪(ICP-OES)分析了活化后煤矸石的硅-铝离子溶出特性。活化后的材料分别加入NaOH、Na_(2)SiO_(3)两种化学激发剂进一步活化,结果显示:活化温度为800℃、煤矸石占比为66.7%、Na_(2)SiO_(3)添加量为4%的胶凝材料活化效果最佳,流动距离可达19.3 cm, 28 d抗压强度为13.47 MPa,热重分析水化进程表明,在此活化条件下650~800℃间质量损失最多,所生成的方解石量达到8.81%;白云岩会延缓煤矸石在热活化时的团聚效应,使其最佳活化温度达到800℃;对于化学激发剂来讲,适量添加可以加速水化进程,反之则会延缓水化进程。In order to increase the use of coal gangue in grouting materials, the activity and performance of activated coal gangue-based grouting materials were studied. The influences of activation temperature, coal gangue proportion, and chemical activators on the fluidity, setting time and compressive strength of thermally modified coal gangue-based grouting materials were analyzed. The phases of coal gangue materials before and after thermal activation were analyzed using X-ray fluorescence spectroscopy(XRF) and X-ray diffraction analysis(XRD), and the leaching characteristics of silicon and aluminum of activated coal gangue were analyzed using inductively coupled plasma optical emission spectroscopy(ICP-OES). The activated material was further activated by adding two chemical activators, NaOH and Na_(2)SiO_(3).The results show that the cementitious material with an activation temperature of 800 ℃, a coal gangue proportion of 66.7%, and a Na_(2)SiO_(3) dosage of 4% has the best activation effect, which has a flow distance of 19.3 cm and a compressive strength of 13.47 MPa at 28 d. Thermogravimetric analysis of the hydration process shows that under this activation condition, the mass loss was the highest between 650-800 ℃, and the amount of calcite generated reached 8.81%. Adding dolomite will delay the agglomeration effect of coal gangue during thermal activation, making its optimal activation temperature reach 800 ℃. Moderate addition of chemical activators can accelerate the hydration process, while the opposite will delay the hydration process.

关 键 词：煤矸石基注浆材料 白云岩 活化温度 碱激发 热重分析 

分 类 号：TD849.5[矿业工程—煤矿开采]