Synergistic effect of particle heterogeneity and size on the surface hydrophobicity characterization of low rank coal

Abstract

In this article, five particle size fractions such as +0.500 mm, 0.500–0.250 mm, 0.250–0.125 mm, 0.125–0.074 mm, and −0.074 mm were used to investigate the synergistic effect of particle heterogeneity and size on the hydrophobicity characterization of low rank coal surfaces using induction time and wetting thermodynamic measurements. The high induction time result of +0.500 mm size fraction with low ash content proved that the physical property, especially particle size, has a significant effect on induction time and wetting thermodynamic measurements. Moreover, LHR value and combustible recovery of 0.250–0.125 mm size fraction were higher than that of 0.125–0.074 mm size fraction, which indicated that the induction time measurement was greatly affected by the chemical property, i.e. heterogeneity. Furthermore, wetting thermodynamic measurements can be used as the supplement of induction time measurements while the ash content of the particle size fractions is close.

Keywords:

• Induction time
• wetting thermodynamic
• particle size
• heterogeneity
• hydrophobicity
• low rank coal

Correction Statement

This article has been republished with minor changes. These changes do not impact the academic content of the article.

Additional information

Funding

This work was supported by Qianjiaohe KY Zi [2019]126, 2018 high-level talent research and startup fund project (LPSSYKYJJ201811), Qiankehe Platform of Science and Technology for Talents ([2018]5777), Key Supported Discipline of Guizhou Provence (Qian Xuewei He Zi ZDXK [2016]24), National Natural Science Foundation of China (No. 50874107), and Liu panshui Normal University creative team (LPSSYKJTD201401).