摘要
机械搅拌是絮团分选超净煤过程中至关重要的环节。通过理论计算和分析,论证了絮团形成过程中搅拌能量场输入的必要性,试验分析了搅拌转速、搅拌时间对絮团粒度及超净煤分选的影响,对比了经两种不同超细粉碎方式粉碎后的煤颗粒形成的絮团大小和超净煤分选结果的差异。结果表明:颗粒间的相互作用势能存在能垒峰,机械搅拌能量场的输入,赋予了煤粒克服能垒的动能,使其能在疏水势能作用下发生聚团。粒度越小,需要输入的搅拌能量就越高。粒度较小的煤颗粒,随着搅拌转速、时间的增加,絮团粒度及超净煤产率出现小幅度的升高后逐渐降低。较强的搅拌能量场输入有利于分选出灰分更低的超净煤。与搅拌磨粉碎后的煤样相比,经气流磨粉碎后的超细煤形成的絮团粒度较大,分选出的超净煤产率和灰分较高。
Mechanical stirring is a very important step in the process of ultra-fine coal separation.Through theoretical calculation and analysis,the necessity of stirring energy input in floc flotation process are demonstrated,and the effects of stirring speed and stirring time on floccules size and ultra clean coal separation are experimentally analyzed.The floc size formed by coal particles grinded by two different ultra-fine grinding methods and the separation results of ultra clean coal were compared.The results show that there is an energy barrier peak in the interaction potential energy between particles,and the energy input of mechanical stirring endows the coal particles with the kinetic energy to overcome the energy barrier,which enables them to agglomerate under the action of hydrophobic potential energy.The smaller the particle size,the higher the input of stirring energy.With the increase of stirring speed or stirring time,the floccules size and ultra-clean coal yield increases slightly and then decreases gradually for coal particles with smaller particle size.Stronger stirring energy input is beneficial to the separation of ultra-clean coal with lower ash content.Compared with the coal samples grinded by stirring mill,the ultrafine coal pulverized by jet mill has larger-sized flocs and higher yield and ash content of ultrafine coal.
作者
王婕
李琼
赵静
张广山
WANG Jie;LI Qiong;ZHAO Jing;ZHANG Guangshan(College of Civil Engineering,Taiyuan University of Technology,Taiyuan 03024,China;Shanxi Institute of Geology and Mineral Resources Co.,Ltd.,Taiyuan 030001,China;School of Chemistry and Materials Engineering,Huainan Normal University,Huainan 232038,China;Metaspace(Beijing)Air Dome Corp.,Beijing 100125,China)
出处
《煤炭工程》
北大核心
2023年第8期159-164,共6页
Coal Engineering
基金
山西省青年科技研究基金(201901D211040)。
