近日，南方科技大学刘科团队实现了甲醇湿磨法制备微米纳米级煤颗粒。该项研究成果发表在2026年2月3日出版的《颗粒学报》杂志上。

受制于粉碎极限的限制，自上而下法生产超微细及亚微米级煤粉是一个耗时长且能耗高的过程。研究组探讨了甲醇湿法研磨的可行性，并从宏观、微观结构、晶体及分子层面揭示了其破碎机理。结果表明，当研磨时间为35分钟时，煤粉的d50粒径从23.20微米降至1.60微米。因此，甲醇湿法研磨是制备超微细煤粉的有效方法。随着研磨时间延长，样品的BET比表面积持续增加，表明未达到粉碎极限。

同时，样品中高岭石、无定形碳、石英和方解石的特征衍射峰强度因晶格表面不稳定能量破坏晶体结构而逐渐减弱直至完全消失。芳香环在高能持续应力作用下发生断裂重组，形成带有自由基的芳香环结构。甲醇分子接枝到含自由基的芳香环上，由于与甲醇相容性的侧链增加，煤颗粒外部易于形成甲醇壳层。这种结构阻碍了颗粒团聚，从而促进了超细研磨过程。

附：英文原文

Title: Preparation of micron-nano coal particles by wet grinding in methanol

Author: Changning Wu b c, Ke Liu a b

Issue&Volume: 2026/02/03

Abstract: Limited by comminution limit, the top-down method is a time-consuming and high energy demands process to produce ultrafine and submicron coal. The feasibility of the wet grinding in methanol was probed, and the breakage mechanism was investigated from the macroscopic, microstructure, crystal, and molecular perspectives in this study. The results show that at 35 min grinding time, the coal’s d50 size decreased from 23.20 to 1.60 μm. Therefore, wet grinding in methanol is an efficient method to produce ultrafine coal. Moreover, with the increase of grinding time, the BET specific surface area of the sample increase, indicating that the comminution limit is not reached. Moreover, the characteristic diffraction peak intensity of kaolinite, amorphous carbon, quartz, and calcite of the sample decrease until they completely disappear due to destroy the crystal structure by the unstable energy on the lattice surface. The aromatics rings are cleaved and rearranged to form aromatic rings with radicals in continuous high-energy stress. The methanol was grafted onto the aromatic rings with radicals. The methanol shell may be easily built on the outside of coal particles due to increasing these side chains with compatibility with methanol. The agglomeration of particles is hindered, and thus the ultrafine grinding is promoted.

DOI: 10.1016/j.partic.2026.01.028

Source: https://www.sciencedirect.com/science/article/abs/pii/S1674200126000544