| Summary: | The influence of air humidity and water particles on dust control was examined using ultrasonic atomization at 2.4 MHz, an acrylic box (61 L), andfour types of ore dust samples: green tuff (4 m), green tuff (6 m), kaolin, and silica. It was clearly demonstrated that ultrasonic atomization waseffective in raising humidity rapidly. However, at high relative air humidity, the water particles remained stable in the box without changing to watervapor. Ultrasonic atomization was applied to suppress dust dispersion and 40–95% dust reduction was achieved at 83% relative air humidity. Dustdispersion was more effective with ultrasonic atomization than without.
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