Inhibiting effects of Zn/Mg/Al layer double hydroxide on coal spontaneous combustion

ZHANG Yutao; SHI Xueqiang; LI Yaqing; WEN Hu; HUANG Yao; LI Shanshan; LIU Yurui

doi:10.13225/j.cnki.jccs.2017.0855

Abstract：Coal spontaneous combustion is a serious threat for the production of coal mines.Application of inhibitors is one of widely used method to prevent coal spontaneous combustion.TG/DSC synchronous analyzer coupling with Fourier infrared spectrometer (FTIR) was employed to investigate the inhibiting effects of Zn1 Mg2Al1-CO3-LDHs on coal spontaneous combustion.Inhibiting effects were evaluated from standpoints of quality,characteristics temperatures,thermal characteristics,and gases products during the process of coal spon-taneous combustion.Experimental results show that the endothermic effect resulted from pyrogenic decomposition of Zn1 Mg2Al1-CO3-LDHs was the main reason that Zn1Mg2Al1-CO3-LDHs inhibited coal spontaneous combustion.The temperature corresponding to the maximum rate of dehydration and desorption,slow oxidation temperature,and temperature started to release heat could be increased by Zn1Mg2Al1-CO3-LDHs.Nevertheless,Zn1Mg2Al1-CO3-LDHs can reduce the maximum heat release power of coal samples.Meanwhile,it can slightly promote the production of CO2 during the oxidation process.All of these results indicate that Zn1 Mg2Al1-CO3-LDHs exhibited great inhibiting effects on coal spontaneous combustion.