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为了研究煤尘堆垛结构对其润湿性的影响,对从全国选取的10种不同变质程度煤样进行X射线衍射实验,结合液-固界面动态接触角测定结果,分析得到煤尘微晶参数与其润湿性之间的关系.结果表明,无机矿物种类随着煤样变质程度的提高逐步减少,且原生矿物种类数量越多,润湿性则越好,次生矿物对煤尘润湿性的影响则较小.变质程度高的煤种晶态成分较多,芳晶结构单元较大,芳香环缩合度较高;而中低变质程度煤种的非晶态成分较多,往往是一些亲水性的烷基小分子侧链、含氧官能团等.随着堆砌度和延展度不断升高,面网间距逐渐减小,煤尘润湿性逐步变差.当煤尘X射线衍射的堆砌度为18.5 nm,延展度为41.7 nm,面网间距为0.898 nm时,煤尘润湿性最佳,其X射线衍射微晶参数越接近上述组合,润湿性越好.
In order to study the influence of stack structure of coal dust on its wettability, X-ray diffraction experiments were carried out on 10 different coal samples selected from the whole country. Combined with the dynamic contact angle measurement results of liquid-solid interface, The results show that the types of inorganic minerals gradually decrease with the increase of the degree of coal metamorphism, and the more the types of primary minerals, the better the wettability, and the secondary minerals wetting coal dust The influence of sex is smaller.The coal with higher degree of metamorphism has more crystalline components, the larger the aromatic structure unit and the higher degree of aromatic ring condensation, while the coal with low and medium degree of metamorphism has more amorphous components, Some hydrophilic alkyl small molecule side chains, oxygen-containing functional groups, etc. With the increasing degree of slump and extension, the distance between surface webs gradually decreases, and the wettability of coal dust gradually deteriorates.When the coal dust X-ray diffraction The results showed that the wettability of coal dust was the best when the degree of packing was 18.5 nm, the elongation was 41.7 nm and the surface network spacing was 0.898 nm. The closer the XRD parameters were, the better the wettability was.