Synergistic effects of dodecane-castor oil acid mixture on the flotation responses of low-rank coal:A combined simulation and experimental study  

作　　者：Fen Xu Shiwei Wang Rongjie Kong Chengyong Wang 

机构地区：[1]College of Environmental and Chemical Engineering,Dalian University,Dalian 116622,China [2]School of Mines and Mechanical Engineering,Liupanshui Normal University,Liupanshui 553004,China

出　　处：《International Journal of Mining Science and Technology》2023年第5期649-658,共10页矿业科学技术学报（英文版）

基　　金：the Foundation of Guizhou Province(No.Qiankehe-ZK[2021]Yiban 255);the National Natural Science Foundation of China(No.52264032);the Foundation of Liupanshui Normal University(No.LPSSYLPY202122).

摘　　要：The utilization of an appropriate collector or surfactant is crucial for the beneficiation of low-rank coal.However,in previous studies,the selection of surfactants was primarily based on flotation procedures,which hinders the understanding of the interaction mechanism between surfactant groups and oxygen-containing functional groups at the surface of low-rank coal.In this study,we investigate the flotation of low-rank coal in the presence of a composite collector by using a combined theoretical and experimental approach.The maximum flotation mass recovery achieved was 82.89%using a 3:1 mixture of dodecane and castor oil acid.Fourier-transform infrared and X-ray photoelectron spectroscopic analyses showed that castor oil acid was effectively adsorbed onto the surface of low-rank coal,enhancing the hydrophobicity of the coal.In addition,the diffusion coefficient of water molecules in the water-composite collector-coal system was greater than that in the dodecane system.Moreover,due to the presence of castor oil acid in the flotation process,the adsorption distance of dodecane and low-rank coal became shorter.Molecular dynamics simulations revealed that the diffusion and interaction of surfactant molecules at the interface of low-rank coal particles and water was enhanced because the adsorption of the dodecane-castor oil acid mixture is primarily controlled by hydrogen bonds and electrostatic attraction.Based on these results,a better surfactant for flotation of low-rank coal is also proposed.

关 键 词：Low-rank coal FLOTATION Castor oil acid Surface hydrophobicity Molecular dynamics simulation 

分 类 号：TD94[矿业工程—选矿] TD923