Effect and Mechanism of Rare Earth Hydrotalcite Inhibiting Coal Spontaneous Combustion

作     者：张小娟 LIU Bo 罗振敏 SUN Lu ZHANG Xiaojuan;LIU Bo;LUO Zhenmin;SUN Lu

作者机构：School of Safety Science and EngineeringXi’an University of Science and TechnologyXi’an 710054China 

出 版 物：《Journal of Wuhan University of Technology(Materials Science)》 (武汉理工大学学报（材料科学英文版）)

年 卷 期：2024年第39卷第1期

页      面：50-59页

核心收录：

学科分类：0819[工学-矿业工程] 081903[工学-安全技术及工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：Funded by National Natural Science Foundation of China (No.52074218)。 

主　　题：rare earth hydrotalcite coal spontaneous combustion mechanism 

摘      要：A hydrotalcite(layered double hydroxide, LDH) inhibitor which is suitable for the whole process of coal spontaneous combustion and a LDH inhibitor containing rare earth lanthanum elements were prepared. The inhibition effect and mechanism were analyzed by scanning electron microscopy(SEM),X-ray diffraction(XRD), thermal performance analysis, in-situ diffuse reflectance infrared spectroscopy and temperature-programmed experiment. The results have shown that the inhibitor containing lanthanum can play a good inhibitory role in every stage of coal oxidation. During the slow oxidation of coal samples, the inhibitor containing lanthanum ions can slow down the oxidation process of coal and increase the initial temperature of coal spontaneous combustion. At the same time, because the hydroxyl groups in LDHs are connected with-COO-groups on the coal surface through hydrogen bonds, the stability of coal is improved. With the increase of temperature, LDHs can remove interlayer water molecules and reduce the surface temperature of coal. CO release rate of coal samples decreases significantly after adding inhibitor containing lanthanum element, and the maximum inhibition rate of the inhibitor is 58.1%.