LDHs复合阻化剂对煤阻化性能的试验研究

Experimental study on LDHs composite inhibitor to coal resistance property

为了降低神府煤的自燃危险性,采用原位共沉淀法制备了锌镁铝水滑石粉状复合阻化剂,将其与神府矿区长焰煤种按比例进行机械混合制成阻化煤样。利用热重/差示扫描量热仪-傅里叶变换红外光谱仪联用技术对阻化煤样进行分析表明,热重(TG)曲线各特征温度点比原煤总体上滞后,煤着火点提高,阻化剂混合量达到煤样的20%时,滞后现象明显,放热峰温度从135℃升高到560℃,峰面积明显降低,说明锌镁铝水滑石粉状复合阻化剂多级吸热抑制了煤氧化。傅里叶变换红外光谱(FTIR)图谱显示,加入阻化剂煤样CO释放量明显减少,因此锌镁铝水滑石粉状复合阻化剂对神府煤的阻化效果明显。

In order to reduce the spontaneous combustion danger of Shenfu Coal, an in situ coprecipitation method was applied to prepare ZnMgAl-CO3-LDHs complex inhibitor. Then the inhibitor and a given percentage of the long flame coal from Shenfu Mining Area would be mechanically mixed to prepare the inhibition coal samples. A thermogravimetry/differential scanning calorimeter - Fourier transform in- frared spectrometer combined technology were applied to analyze the inhibition coal samples. The analysis results showed that each feature temperature point of inhibition coal samples would be delay generally than the raw coal and the ignition point of the coal was increased on the TG curve. When the mixing quantity of the inhibitor reached to 20% of the coal sample, the delay phenomenon would be obvious. The exotherm temperature would be increased from 135 ℃ to 560 ℃ and the peak area would be obviously reduced. Therefore, the ZnMgAl- CO3 -LDHs complex inhibitor could absorb the heat in multi grade and could control the coal oxidation. The FTIR spectra showed that CO released volume from the coal samples added with the complex inhibitor would be reduced obviously, therefore, the complex inhibitor would have an obvious inhibition effect to Shenfu Coal.