摘要：采用EasyDrop DSA20型接触角测量仪,研究3种不同变质煤样经湿法超细粉碎后润湿性的变化,计算得到超细粉碎后煤颗粒表面张力、煤-水界面表面张力和煤-水体系粘附功的变化。结果表明:神木不粘煤与淮南气煤2种低阶煤经湿法超细粉碎后疏水性增强,太西无烟煤在长时间超细粉碎后疏水性减弱;超细粉碎后,煤颗粒表面张力、煤-水体系粘附功与接触角呈负相关。

关键词：超细粉碎；润湿性；表面张力；粘附功

Abstract：Contact angle measurement EasyDrop DSA20 was used to study the wettability of three different coal samples after wet ultra-fine grinding. The surface tension of coal particles and coal-water interface,the adhesion work of coal-water system were calculated. The results show that the hydrophobicity of two kinds of low rank coals including Shenmu non-caking coal and Huainan gas coal is enhanced after wet ultra-fine grinding. For a long time of wet super fine crushing, the hydrophobicity of Taixi anthracite coal weakens. After ultra-fine grinding, the variation tendency of coal surface tension and adhesion work of coal-water system is in contrast with the contact angle.

Keywords: ultra-fine grinding；wettability；surface tension；adhesion work