Exploration on the mechanism of enhancing flotation of long-flame coal by diesel modification via oxidation

IF 4.2 2区 工程技术 Q2 ENGINEERING, CHEMICAL
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Abstract

Low-rank coal is naturally hydrophilic, and the traditional hydrocarbon collectors often have poor performance in its flotation. In this study, the modification of diesel was conducted using an instantaneous gasification-oxidation-condensation device for the expected improvement of collector’s performance. Experimental analyses and interfacial interaction calculation were performed to explore the mechanism of enhancing flotation of long-flame coal by diesel modification. It indicated that the flotation of coal sample can be greatly enhanced by the modified diesel, and a combustible matter recovery of 90.52 % could be attained only consuming 6 kg/t of modified diesel which was far better than the flotation effect consuming 100 kg/t of common diesel. The improved flotation effect of the coal sample could be attributed to the increased polarity of collector from 0.48 % to 9.76 % resulted from the newly added oxygenated functional groups after the oxidation of diesel, which significantly enhanced the adsorption capacity of the collector on the long-flame coal surface reflected by the FTIR and XPS analyses. Furthermore, the calculated results of interfacial interaction between the coal sample and the common/modified diesel suggested that the efficient adsorption of modified diesel on the coal sample was achieved through the bridging role acted by water molecules. This research may give some insight into enhancing flotation of low-rank coal.

Abstract Image

柴油氧化改性增强长焰煤浮选机理探讨
低阶煤具有天然亲水性,传统的碳氢化合物捕收剂在其浮选中往往性能不佳。本研究利用瞬时气化-氧化-缩合装置对柴油进行改性,以期改善捕收剂的性能。通过实验分析和界面相互作用计算,探讨了柴油改性提高长焰煤浮选性能的机理。结果表明,改性柴油可大大提高煤样的浮选效果,仅消耗 6 千克/吨改性柴油就可获得 90.52 % 的可燃物回收率,远远优于消耗 100 千克/吨普通柴油的浮选效果。煤样浮选效果的改善可归因于柴油氧化后新添加的含氧官能团使捕收剂的极性从 0.48 % 增加到 9.76 %,从而显著提高了捕收剂在长焰煤表面的吸附能力,这一点可从傅立叶变换红外光谱和 XPS 分析中反映出来。此外,煤样与普通/改性柴油之间界面相互作用的计算结果表明,改性柴油在煤样上的高效吸附是通过水分子的架桥作用实现的。这项研究可为提高低阶煤的浮选效果提供一些启示。
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来源期刊
Advanced Powder Technology
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.)
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