Experiment study on fine coal slime flotation with simultaneous ultrasonic treatment
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摘要: 为探究超声波对细粒煤泥浮选过程的影响，自制超声浮选装置进行浮选试验。 使用激光 粒度仪、扫描电子显微镜，分析超声波对浮选产品粒度组成和表面特性的影响；利用紫外分光 光度计测定矿浆剩余捕收剂量，计算超声波对捕收剂吸附的影响。 试验结果表明：在浮选过程加 入超声波后，可燃体回收率、浮选完善指数均有提升；100kHz超声波作用时，可燃体回收率比常 规浮选提高10%，改进效果最佳；在同等浮选条件下，超声浮选比常规浮选所需浮选药剂用量低 19%~35%。 超声作用能够去除煤粒表面吸附细泥，促使浮选气泡团聚，形成气絮团，提高大于+0.045mm粒级的浮选效率。Abstract: In order to investigate the effect of ultrasonic simultaneous treatment on flotation of fine coal slimes,a new ultrasonic flotation device was made to conduct floatation experiment. The particle size distribution of clean coal particles was investigated by SEM.The influence of ultrasound on adsorption of collector was investigated by UV spectrophotometer.The result revealed that combustible recovery and perfect index flotation of floated products increased by using ultrasonic treatment with same reagent dosages.The best flotation effect can be achieved with 100 kH ultrasound , and the combustible recovery rate is 10% higher than that of conventional flotation.Ultrasonic floatation need 19%~35% less reagent dosages than conventional floatation under the same flotation condition.Ultrasonic can remove the fine mud adsorbed on the surface of coal particles , promote bubble agglomeration in the pulp,form air flocculation ,and improve the flotation efficiency of particles with size of +0.045 mm.
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