摘要
通过C80微量热仪和微电泳仪等仪器考察了十二烷基醇聚氧乙烯醚(AEO-15)在低阶煤中有机质和矿物质表面的吸附特性,并在浮选作业前对吸附于低阶煤泥上的表面活性剂进行超声条件下的选择性脱除,以提高浮选低阶精煤品质。结果表明:超声波可以减小低阶煤泥颗粒的粒径,降低颗粒表面的负电性,增加低阶煤表面的疏水性;超声波选择性脱除表面活性剂90s后的浮选结果,同未超声脱附的浮选结果相比,精煤产率变化不大,灰分降低了1.24%(质量分数,下同),浮选完善度由34.27%增加到36.93%。处理120s的低阶煤润湿热达到最大(1.69J/g),超声脱附120s后,矸石上浮率降低了10.24%。
The adsorption characteristics of dodecyl primary alcobol ethoxylate ether(AEO-15)on the surface of organic matter and minerals in low rank coal were investigated by C80 microcalorimeter and microelectrophoresis.The surfactant adsorbed on the low rank coal was selectively removed under ultrasonic conditions prior to the flotation operation,thereby improving the quality of flotation clean coal.The results show that the ultrasound can reduce the particle size of the low rank coal slurry particles,reduce the negative electric properties of the particle surface,and increase the hydrophobicity of the low rank coal slurry surface.Compared with the coal sample flotation results without ultrasonic desorption of surfactants,the result of ultrasonic selective removal of surfactant for 90 sshows that the yield of clean coal is roughly the same,the ash mass fraction decreases by 1.24%(mass fraction,the same below),and the floatation perfect index increases from 34.27%to 36.93%.The wetting heat value of low rank coal treated for 120 s reaches the maximum value for 1.69 J/g.After 120 sof ultrasonic desorption,the gangue floating rate is reduced by 10.24%.
引文
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