煤尘表面含氧官能团对煤尘润湿性能的影响

Effects of Oxygen Containing Functional Groups on Coal Dust Wettability

采用光学接触角测量仪,测量了不同煤质的微细煤尘对去离子水以及添加氯化钙、水玻璃、丁二酸纳、十二烷基磺酸钠、十二磺基硫酸钠等表面活性剂水溶液的润湿接触角。通过红外光谱技术,对煤尘表面的化学结构特别是含氧官能团进行了测量,并分析了其对颗粒表面的表面活性剂溶液润湿性能的影响,同时对不同煤质微细煤尘进行了工业分析,建立了煤尘润湿性与煤尘煤质参数及其表面含氧官能团含量之间的耦合关系,研究发现煤尘的固定碳含量、表面含氧官能团中的羰基基团、游离OH基团对煤尘的润湿性能具有显著的影响。

The optical contact angle measuring instrument is used to measure the wetting contact angle of the deionized water and the aqueous solution added calcium chloride, water glass, sodium succinate, sodium dodecyl sulfate, twelve sulfonic sodium sulfate as surfactant of different fine coal. Using infrared spectroscopy, the chemical structure of coal dust surface especially oxygen - containing functional groups were measured, and the influence of the surfactant of the particles surface on wetting properties were analyzed. At the same time, by doing industrial analysis of different kinds of fine coal dust, the coupling relationship between the coal dust wettability and coal quality parameters and surface oxygen containing functional groups was set up. The study found that fixed carbon content of coal dust, carbonyl group and free OH groups of surface oxygen containing functional groups have remarkable influence on the coal dust wettability.