Abstract Coal gasification slag is abundant of unburned carbon and inorganic matters such as silica, alumina and calcium oxide. The mesoporous structure of coal gasification slag can be produced by acid leaching of metal ions. Therefore, it is very important to study the acid leaching process of coal gasification slag. At the same time, in order to broaden the application fields of coal gasification slag, the thermal stability of the as-prepared pore structure should meet the requirements of various occasions. Using coal gasification coarse slag (CS) and coal gasification fine slag (FS) as raw materials, this study investigated the kinetic characteristics of mesoporous formation and optimized the acid leaching conditions. The results of BET, BJH, SEM, XPS and chemical tests showed that under the condition of acid-ash ratio (molar ratio) of 1.0, liquid-solid ratio (volume/mass) of 4:1 and acid leaching temperature of 90 °C, the formation of mesoporous structure by acid leaching was a process of first-order kinetic reaction. According to the analysis of XRD, it was found that the thermal stability of both CS and FS had been greatly improved after acid leaching because of the siliceous enrichment.

中文翻译：

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煤气化渣酸浸介孔形成动力学分析及其热稳定性

摘要 煤气化炉渣中含有丰富的未燃碳和二氧化硅、氧化铝、氧化钙等无机物。煤气化渣的介孔结构可以通过金属离子的酸浸产生。因此，研究煤气化渣的酸浸工艺具有十分重要的意义。同时，为拓宽煤气化渣的应用领域，所制备的孔隙结构的热稳定性应满足各种场合的要求。本研究以煤气化粗渣（CS）和煤气化细渣（FS）为原料，研究了介孔形成的动力学特征，优化了酸浸条件。BET、BJH、SEM、XPS和化学测试结果表明，在酸灰比（摩尔比）为1.0的条件下，在液固比（体积/质量）为4:1，酸浸温度为90℃时，酸浸形成介孔结构是一个一级动力学反应过程。根据XRD分析发现，酸浸后CS和FS的热稳定性均因硅质的富集而得到极大的提高。