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Effect of pores on the flotation of low-rank coal: An experiment and simulation study
Fuel ( IF 7.4 ) Pub Date : 2020-07-01 , DOI: 10.1016/j.fuel.2020.117557
Liang Shen , Chuanzhen Wang , Fanfei Min , Lingyun Liu , Changguo Xue

Abstract Low rank coal contains a large number of pores and cracks which have an adverse influence on its flotation behavior. Effects of pores on the hydration layer and flotation behavior of low-rank coal were studied by molecular dynamics method and experiments in this paper. A specific surface area/pore analyzer was employed to determine the pore structure. Pore distribution analysis indicated that the pores in the low-rank coal are mainly micropores. Pore volume and average pore diameter in low-rank coal can be reduced by pore compression pretreatment. Coal-bubble attachment experiments were conducted to study the effect of pores on the effect of pores on particle bubble adhesion process. Results showed that coal particles with less pores were more likely to adhere to the surface of the bubble. And a probable mechanism for the effect of pores on the adhesion of coal particles to bubbles was proposed. Molecular dynamics simulation results revealed that the pores on the surface of low-rank coal reduce the mobility of water molecules and form a more stable hydration layer. Flotation results indicated that reducing the pore content in low-rank coal could reduce the collector dosage in flotation process and improve the flotation behavior of low-rank coal.

中文翻译:

孔隙对低阶煤浮选的影响:实验与模拟研究

摘要 低阶煤含有大量孔隙和裂缝,对其浮选行为产生不利影响。本文采用分子动力学方法和实验研究了孔隙对低阶煤水化层和浮选行为的影响。使用比表面积/孔分析仪来确定孔结构。孔隙分布分析表明,低阶煤中的孔隙以微孔为主。低阶煤的孔隙体积和平均孔径可通过孔隙压缩预处理降低。煤-气泡附着实验研究了气孔对气孔对颗粒气泡附着过程的影响。结果表明,孔隙较少的煤颗粒更容易粘附在气泡表面。并提出了孔隙对煤颗粒粘附于气泡的影响的可能机制。分子动力学模拟结果表明,低阶煤表面的孔隙降低了水分子的流动性,形成了更稳定的水化层。浮选结果表明,降低低阶煤的孔隙含量可以减少浮选过程中捕收剂的用量,改善低阶煤的浮选行为。
更新日期:2020-07-01
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