表面含氧官能团对煤成浆性的影响

Influence of surface oxygen-containing functional groups on slurryability of coals

选取了七种不同变质程度的煤种进行制浆实验,并通过红外光谱和X射线能谱分析不同煤种表面的含氧官能团,研究煤表面官能团对煤成浆性的影响。研究结果表明,随着煤阶的增加,煤表面芳香烃的含量增加,羟基OH、羧基COOH、共轭CO等含氧官能团的含量降低。煤表面含氧官能团越低,导致煤表面亲水性越弱。在水煤浆中,亲水性越弱的煤颗粒表面束缚的水越少,起润滑作用的自由水就越多,有利于浆体的流动,煤的成浆浓度越高。因此,随着煤阶增加,煤的成浆性越好。

Seven kinds of coals with different rank were chosen to prepare slurry, and surface oxygen-containing functional groups of these coals were analyzed by using FTIR and XPS, to study effects of oxygen-containing functional groups on coals＇ slurryability. Resulsts showed that, as coars rank increasing, the content of aromatic hydrocarbon on coal surface increased, and the content of oxygen-containing functional groups, such as OH, COOH, CO, decreased. The lower surface oxygen containing functional groups made the hydrophilicity of coal surface weaker. In the coal water slurry, coal particles with weaker hydrophilicity absorbed less bound water on the surface, and there was more free water, acting as a lubricant, which was beneficial to flow of coal water slurry, so the coal＇s slurry concentration was higher. Therefore, the coal with higher rank had better slurryability.