煤粒形状与捕收剂对颗粒气泡相互作用行为的影响  

Effect of coal particle shape and collector on interaction between a particle and a bubble

作　　者：陈伟旺 陈炫来 张志强[1] 张继龙[1] CHEN Weiwang;CHEN Xuanlai;ZHANG Zhiqiang;ZHANG Jilong(College of Mining Engineering,Taiyuan University of Technology,030024 Taiyuan,China)

机构地区：[1]太原理工大学矿业工程学院,太原030024

出　　处：《煤炭转化》2023年第2期84-91,共8页Coal Conversion

基　　金：山西省专利转化专项项目(202202053).

摘　　要：选用煤油、乳化煤油和生物柴油对制备的四种形状煤粒(尖状煤粒、棱状煤粒、面状煤粒和类球形煤粒),其中尖状煤粒和棱状煤粒又根据尖锐度分为5种角度(30°,60°,90°,120°和150°)表面进行改性,用于改性的捕收剂溶液又分为0.05 mmol/L,0.10 mmol/L和0.15 mmol/L三种浓度水平,利用搭建的颗粒-气泡相互作用行为测试系统测量了上述各种条件下改性后四种不同形状煤粒与气泡作用的液膜排水时间和最大吸引力。结果表明:捕收剂浓度相同时,三种油类捕收剂改性面状煤粒与气泡作用的液膜排水时间由小到大依次为生物柴油、乳化煤油、煤油、去离子水,最大吸引力由大到小依次为生物柴油、乳化煤油、煤油、去离子水,从微观角度印证了生物柴油替代传统煤油捕收剂的发展潜力;通过对比不同煤油浓度改性后的不同形状煤粒与气泡作用时间和作用力,如0.10 mmol/L浓度煤油改性的150°尖状煤粒和0.05 mmol/L浓度煤油改性的120°棱状煤粒与气泡作用的最大吸引力相近,结合已有浮选速率常数与附着力之间的线性关系,从微观角度说明了通过改变煤粒形状来减少捕收剂用量的可行性。Three kinds of collecting agents,including kerosene,emulsified kerosene and biodiesel,were used to modify the surface of four kinds of shaped coal particles(sharp coal particles,prismatic coal particles,flat coal particles and spherical coal particles,among which the sharp and prismatic coal particles were divided into five angles(30°,60°,90°,120°,150°)according to the sharpness).Collector used for modification of the solution was divided into three levels,0.05 mmol/L,0.1 mmol/L and 0.15 mmol/L.The particle-bubble interaction behaviors under various conditions were measured in an established testing system,thus the drainage time and maximum attraction of the liquid film formed between modified coal particles with different shapes and bubbles can be determined.Results show that when the concentration of the collector is the same,the application of biodiesel can lead to the smallest drainage time of the liquid film,followed by biodiesel,emulsified kerosene,kerosene and deionized water(in order of drainage time,from smallest to largest).In terms of the maximum attraction,all three oil collectors are arranged in the following order:biodiesel,emulsified kerosene,kerosene and deionized water(from largest to smallest).Hence,the development potential of biodiesel as a substitute for traditional kerosene collector is confirmed from microscopic point of view.In addition,the 150°sharp coal particles modified with 0.1 mmol/L kerosene and the 120°prismatic coal particles modified with 0.05 mmol/L kerosene have similar maximum attraction.It indicates that the interaction behavior between coal particles and bubbles depends on the shape of coal particles and the amount of collector under the same other conditions.Combined with the linear relationship between flotation rate constant and adhesion established,it provides a theoretical basis for reducing the amount of collector by changing the shape of coal particles in actual slime flotation.

关 键 词：煤泥浮选 煤粒形状 捕收剂用量 相互作用力 生物柴油 

分 类 号：TQ520.61[化学工程—煤化学工程]