School of Chemical and Environment Engineering, China University of Mining and Technology (Beijing)

基于低阶煤中含氧官能团的赋存状态对其表面性质的影响,分析了国内外11种典型低阶煤中含氧官能团的含量及含氧官能团中氧占总氧的比例,发现低阶煤中主要的含氧官能团是羟基和羧基,羟基中的氧占总氧的比例为34.79%~53.00%,中国褐煤羧基含量大于羟基含量,其他国家的褐煤羟基含量大于羧基含量。同时对含氧官能团的评价方法(化学分析法和仪器分析法)的优缺点进行了分析;重点阐述了含氧官能团对低阶煤性质(吸水性、Zeta电位、接触角)的影响。含氧官能团的脱除使低阶煤的表面性质由吸水性变为疏水性,降低了其吸水能力,这对低阶煤改质具有重要意义。

Based on the deposit conditions of the oxygen functional groups in the low rank coal affected to the surface properties, the paper analyzed the content 0 f the oxygen functional groups in 11 kinds typical low rank coal at home and abroad and the percentage of the oxygen in total oxygen of the oxygen functional groups.It was found that the main oxygen functional groups in the low rank coal were hydroxyI and carboxyl.The percentage of the oxygen in the hydroxyI account for 34.79% ~ 5 3.00% of the total oxygen, the carboxyI content of China lignite was higher than the hydroxyl content and the hydroxyI content of the lignite in other countries was highe r than carboxyl content.Meanwhile, an analysis was conducted on the advantage and disadvantage of the two evaluation methods (chemical analysis method and the in strument analysis method) for the oxygen functional groups.The paper stressed the oxygen function groups affected to the low rank coal properties (water absorbency, Zeta level and contact angle) .The removal of the oxygen function groups could cause the surface properties of the low rank coal converted from water absorbency to h ydrophobicity and could reduce the water adsorption capacity of the low rank coal.All those would have important significances to the properties modified of the low ran k coal.

国家自然科学基金资助项目(21076222)；