Effective processing and use of coal slime is of great significance to protect the environment and save resources. Different coal slimes (untreated with 43 wt% ash content, crushed and flotation treated with 10 wt% ash content, and pre-carbonized) were activated with KOH to prepare porous activated carbon. The results show the activated carbon prepared from coal slime with 10 wt% ash had high specific surface area (3037 m²/g) and pore volume (1.66 cm³/g), which was ascribed to the suitable contents of minerals as template and oxygen-containing functional groups. Electrochemical measurements exhibited the best specific capacitance of 220 F/g at 0.1 A/g and the cycle stability of over 100% capacitance retention after 1000 cycles at 5 A/g in 6 M KOH solution. Due to the high specific surface area, superior electrochemical performance, and facile and low cost, developing highly porous activated carbon for supercapacitors is one alternative way for effective use of coal slime waste.

有效处理和使用煤泥对保护环境和节约资源具有重要意义。用KOH活化不同的煤泥（未经处理的灰浆含量为43 wt％，经破碎和浮选处理，灰浆含量为10 wt％，并已预碳化）以制备多孔活性炭。结果表明，由煤灰含灰量为10 wt％制备的活性炭具有较高的比表面积（3037 m ² / g）和孔体积（1.66 cm ^3）/ g），这归因于矿物质作为模板和含氧官能团的合适含量。电化学测量显示在0.1 A / g时的最佳比电容为220 F / g，在6 M KOH溶液中以5 A / g进行1000次循环后的循环稳定性超过100％。由于高的比表面积，优异的电化学性能以及简便且低成本，开发用于超级电容器的高度多孔的活性炭是有效利用煤泥废料的一种替代方法。