Fine slag (FS), which is a by-product from coal gasification, is composed of inorganic minerals and residual carbon. Acid treatment has high efficiency to separate the residual carbon in FS but the changes of properties of FS treated by acid remain unclear. To have a deep understanding of effects of acid treatment on physicochemical properties and gasification activity of FS, FS was subjected to different acid treatment, and then were characterized using Nitrogen adsorption technique, Raman spectroscopy and thermo-gravimetric analyzer. The results showed that the combined treatment with hydrochloric acid and hydrofluoric acid can remove the almost all mineral matters. Acid treatments did not modify the continuous and complete pores structure of FS. While, hydrochloric acid has a major influence on carbon structure, which produces the highest carbon actives and amorphous carbon. Nitric acid has positive influence on carbon structure transformation to crystalline structure. Notably, the gasification time can be shortened by the reduction of ash content. The carbon active sites in samples governed the initial reactivity while at the late stage of gasification the amount of inorganic elements controlled the gasification rate.

细渣（FS）是煤气化的副产品，由无机矿物和残余碳组成。酸处理具有很高的分离FS中残留碳的效率，但是用酸处理的FS的性能变化仍然不清楚。为了深入了解酸处理对FS的理化性质和气化活性的影响，对FS进行了不同的酸处理，然后使用氮气吸附技术，拉曼光谱和热重分析仪对其进行了表征。结果表明，盐酸和氢氟酸联合处理可以去除几乎所有矿物质。酸处理并未改变FS的连续和完整的毛孔结构。盐酸对碳结构有很大影响，产生最高的活性炭和无定形碳。硝酸对碳结构转化为晶体结构具有积极影响。值得注意的是，通过减少灰分含量可以缩短气化时间。样品中的碳活性位决定了初始反应性，而在气化后期，无机元素的含量控制着气化速率。