中文摘要：

针对低阶煤泥表面含氧官能团多、亲水性强、可浮性差的难题,采用聚氧乙烯醚型非离子表面活性剂（NP-10）对神东矿业集团大柳塔选煤厂的低阶煤泥进行表面改性机理研究。吸附热力学研究表明,NP-10在煤泥表面的吸附符合Langmuir吸附特征,属物理吸附,吸附过程为焓熵双驱动。吸附动力学过程符合准二级动力学方程,控制机制为颗粒内扩散和液膜扩散共同作用。X射线光电子能谱（X-ray photoelectron spectroscopy,XPS）检测结果表明,低阶煤泥表面的含氧官能团被NP-10显著覆盖,尤其易与C—O（羟基、醚基）官能团以氢键方式结合。NP-10在煤泥表面吸附后,接触角由46.28°提高至55.32°,说明煤泥表面疏水性显著增强,有效提高了低阶煤泥的可浮性。

英文摘要：

Aiming at the problems of low oxygen content, strong hydrophilicity and poor floatability of low rank coal slime sur face, the mechanism of nonylphenolethoxylate （NP-10） modification on the surface of low rank coal slime from Daliuta Coal Prep aration Plant of Shendong coal group was studied. Adsorption thermodynamics study shows that the adsorption of NP-10 on coal exhibits Langmui~type isotherms, which belongs to physical adsorption and the hydrophobic interaction is driven by enthalpy en tropy synergically. Adsorption kinetics of NP-10 over the low rank coal perfectly obeys a pseudo-second-orderkineticmodel,and is controlled by intra-particle diffusion and liquid membrane diffusion. X-ray photoelectron spectroscopy （XPS）indicates that the ox ygen-containing functional groups of the low rank coal slime aresignificantly covered by the NP-10, especially combining with C--O（ohydroxyl and ether group） by hydrogen bond easily. The NP4 surfactant increasesthe contact angle of the low rank coal from 46.28% to 55.32%, indicating that the hydrophobicity of low rank coal slime surface isenhanced significantly, and the float- ability of the low rank coal slime isimproved.