在用传统的 (泡沫 )浮选和溶解空气减压浮选 (DAF)法处理矿石和废水中 ,使用了各种尺寸分布的空气泡。近年来 ,Jameson浮选机和Microcel浮选机的研究已经引起了研究人员的极大兴趣。这些浮选工艺受到气泡的物理特性以及尺寸控制 ,因此 ,准确测定所产生的气泡尺寸分布是必要的。通过捕俘不运动的气泡 ,并联合应用带有数码影像处理程序的显微镜 ,开发了一种测量气泡尺寸分布的新方法。这种技术 (LTM -B型装置 )利用取样器采集沿柱上升的气泡 ,并将它带入特制的观察室中 ,气泡经减速或停止后 ,用数码照相机拍照。因此 ,完全克服了气泡运动所产生的聚焦、照明、拍摄速度和气泡重迭等问题。获得的结果与一些用传统图象分析方法报道的有价值结果对应得很好。这表明采用这种检测技术可以便利和有效地获得精确的气泡尺寸分布资料。对一些影响气泡形成的操作参数进行了研究。可以相信 ,本研究中开发的气泡尺寸测量技术将有助于弄清和改进DAF浮选和传统细粒和超细粒矿物浮选的理论和实践。 Air bubbles of various sizes are used in the treatment of ores and wastewater using conventional (froth) flotation and dissolved air depressurization (DAF) processes. In recent years, the research of Jameson flotation machine and Microcel flotation machine has aroused great interest of researchers. These flotation processes are governed by the physical properties and size of the bubbles, so accurate determination of the resulting bubble size distribution is necessary. A new method of measuring bubble size distribution has been developed by capturing non-moving bubbles and using microscopy with a digital image processing program. This technology (Model LTM-B) uses a sampler to collect bubbles rising up a column and takes it to a special viewing chamber where the bubbles are slowed down or stopped and photographed with a digital camera. Therefore, the problems of focus, illumination, shooting speed and bubble overlap caused by the movement of bubbles are completely overcome. The obtained results correspond well with some of the valuable results reported by traditional image analysis methods. This shows that accurate bubble size distribution data can be conveniently and efficiently obtained using this detection technique. Some operating parameters that affect bubble formation were investigated. It is believed that the bubble size measurement technique developed in this study will help clarify and improve the theory and practice of DAF flotation and conventional fines and fines flotation.