苯酚与氨氮影响水煤浆表观黏度的颗粒间作用力机理探讨

doi:10.11799/ce202411028

摘要/Abstract

摘要： 利用煤化工废水制备水煤浆可降低水煤浆气化工艺废水的处理难度，实现废水中污染物的综合利用，减少对环境的不良影响。选取新疆褐煤，以亚甲基双萘磺酸钠(NNO)为分散剂制备水煤浆，探究了煤化工废水组分中苯酚和氨氮对水煤浆成浆特性的影响机理，并基于原子力显微镜(AFM)探索了相应液相环境中颗粒间相互作用力，分析了其与浆体流变性的关联关系。结果发现，颗粒间作用力与浆体流变性具有良好的对应性，其中：随苯酚浓度的提高，AFM颗粒探针进针过程中斥力增大而作用距离缩短，退针过程中粘附力减弱及作用程的下降，表明苯酚的加入降低了水化膜厚度而释放出更多自由水，表现为表观黏度下降|随着氨氮浓度的提高，AFM颗粒探针进针过程及退针过程均主要表现作用距离的提高，表明氨氮的加入增加了水化膜厚度而束缚了更多自由水，表现为当氨氮浓度足够高时表观黏度快速提高。此外，研究发现即便在液相组成不同时，退针过程的作用距离和最高引力值与表观黏度之间仍呈现出较好的单调关联，为深入探索水煤浆体系中颗粒表界面调控、废水环境调节和添加剂的研发提供了一种机理性指导方法。

关键词: 水煤浆, 原子力显微镜, 颗粒间作用力, 苯酚, 氨氮

Abstract: The preparation of coal water slurry using coal chemical wastewater has achieved comprehensive utilization of pollutants in wastewater, minimizing the adverse impact of wastewater on the environment. This study selected Xinjiang lignite and prepared coal water slurry using sodium naphthalene sulfonate as a dispersant. Explored the influence mechanism of phenol and ammonia nitrogen in wastewater components on the slurry characteristics of coal water slurry, and explored the interaction forces between particles in the corresponding liquid-phase environment based on atomic force microscopy (AFM). The results showed that the inter-particle force had a good correspondence with the rheology of the slurry, in which: with the increase of phenol concentration, the repulsion force of the AFM particle probe increased and the action distance was shortened during the probe feeding process, while the adhesion and action duration decreased during the probe withdrawal process, indicating that the addition of phenol reduced the thickness of the hydration film and released more free water, which was manifested as a decrease in the apparent viscosity. With the increase of ammonia nitrogen concentration, the AFM particle probe feeding process and the withdrawal process mainly showed the increase of action distance, indicating that the addition of ammonia nitrogen increased the thickness of the hydration film and bound more free water, which showed that the apparent viscosity increased rapidly when the ammonia nitrogen concentration was high enough. In addition, it is found that even when the composition of the liquid phase was different, the distance and the maximum attraction value still had a good monotonic correlation with the apparent viscosity during the needle extraction process, which provides a mechanistic guidance method for in-depth exploration of the regulation of particle surface interface, wastewater environment regulation and the research and development of additives in coal water slurry system.

郭勇, 董岳, 胡金亮, 等. 苯酚与氨氮影响水煤浆表观黏度的颗粒间作用力机理探讨[J]. 煤炭工程, 2024, 56(11): 188-194.

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