Experimental study on the influence of water immersion on the wettability of coal dust

IF 4.2 2区工程技术 Q2 ENGINEERING, CHEMICAL

Advanced Powder Technology Pub Date : 2024-06-10 DOI:10.1016/j.apt.2024.104504

Lingfeng Wang , Shixun Ding , Zhengdong Liu , Kaiwen Sun , Zhiyang Zhang , Chang Li , Chunmiao Yuan

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Abstract

In order to enhance the understanding of the wetting mechanism of coal dust and explore additional approaches to improve the wettability of hydrophobic coal dust. Two coal dust samples with different particle sizes were selected and subjected to water immersion treatments. The wetting behavior of coal dust was investigated through a sinking experiment, focusing on the effects of the water immersion process, immersion time, and particle size. Fourier-transform infrared spectroscopy was employed to analyze the changes in functional groups of coal dust during the water immersion process. The results indicated a significant improvement in the wettability of coal dust after a short-term water immersion treatment, and this enhancement effect can be synergistic with the action of surfactants. The increase in hydroxyl content was identified as a crucial factor in enhancing the wettability of coal dust after water immersion. Moreover, the limitations of using the fractal dimension of particle size distribution to characterize the wettability of coal were explored. The results indicated that coal dust with similar fractal dimensions could exhibit significant differences in wettability, suggesting the need for further investigation into the effects of particle size polydispersity and other particle size parameters on coal dust wettability.

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浸水对煤尘润湿性影响的实验研究

为了加深对煤粉润湿机理的理解，探索改善疏水性煤粉润湿性的其他方法。选取了两种不同粒径的煤粉样品，并对其进行了水浸泡处理。通过沉降实验研究了煤粉的润湿行为，重点研究了水浸泡过程、浸泡时间和颗粒大小的影响。傅立叶变换红外光谱分析了煤粉在浸水过程中官能团的变化。结果表明，经过短期水浸泡处理后，煤粉的润湿性得到了明显改善，这种改善效果与表面活性剂的作用具有协同作用。羟基含量的增加被认为是水浸后提高煤粉润湿性的关键因素。此外，还探讨了使用粒度分布的分形维度来表征煤的润湿性的局限性。结果表明，具有相似分形维数的煤粉在润湿性方面会表现出显著差异，这表明有必要进一步研究粒度多分散性和其他粒度参数对煤粉润湿性的影响。

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来源期刊

Advanced Powder Technology 工程技术-工程：化工

CiteScore

9.50

自引率

7.70%

发文量

424

审稿时长

55 days

期刊介绍： The aim of Advanced Powder Technology is to meet the demand for an international journal that integrates all aspects of science and technology research on powder and particulate materials. The journal fulfills this purpose by publishing original research papers, rapid communications, reviews, and translated articles by prominent researchers worldwide. The editorial work of Advanced Powder Technology, which was founded as the International Journal of the Society of Powder Technology, Japan, is now shared by distinguished board members, who operate in a unique framework designed to respond to the increasing global demand for articles on not only powder and particles, but also on various materials produced from them. Advanced Powder Technology covers various areas, but a discussion of powder and particles is required in articles. Topics include: Production of powder and particulate materials in gases and liquids(nanoparticles, fine ceramics, pharmaceuticals, novel functional materials, etc.); Aerosol and colloidal processing; Powder and particle characterization; Dynamics and phenomena; Calculation and simulation (CFD, DEM, Monte Carlo method, population balance, etc.); Measurement and control of powder processes; Particle modification; Comminution; Powder handling and operations (storage, transport, granulation, separation, fluidization, etc.)