Abstract: In order to reduce the fine dust in metal mine blasting，the technique of cloud dust removal on the whole section of roadway was proposed to purify the dust particles in the return current.By using the self-designed atomization experiment platform of cloud nozzle，the atomization effect of cloud nozzle and the influence of air pressure and water pressure on the atomization effect were studied，and the law of air flow and water flow with air pressure was obtained.When the air pressure is 0.5 MPa，the water pressure is 0.2 MPa，the water flow is 35 L/h，and the air flow is 2.65 m3/h，D50 of fog droplets is about 6.0 μm，which is the smallest particle size.Based on the atomization characteristics of the cloud nozzle and the best working conditions，the full-section cloud dusting technology of roadway was produced with the cloud dusting prototype and gas water source disposal as the main body，and the field test was carried out in Meishan Iron Mine.The study results show that the total and respirable dust efficiency after purification by fog dust removal device is 96.89%，96.04% respectively，which indicate that cloud fog and dust particle size was matching good，which can effectively reduce the fine dust concentration along the wind direction，improve the efficiency of dust and achieve better economic benefits and social benefits.

Key words: Metal mine, Dust removal with cloud fog, Atomizing characteristics, Droplet size, Dust removal effect