Abstract: In mine production， a large amount of dust are produced， which seriously pollutes the environment of the working face and poses a great threat to the health of the workers in the working face. In most of metal mines， the drop point and the transfer point are the main sources of dust generation， and the air water spray has a very effective effect on controlling the dust of the ore falling point and the transfer point. Taking Zijinshan Copper Mine as background， the spray nozzle type and caliber of air water spray are optimized to obtain the best atomizing effect of the nozzle with a caliber of 1.5 mm adjustable wide angle. The average particle size of the aerosol is basically ranging from 15 μm to 30 μm， which can effectively complement the dust flying in the working face. The 1.5 mm wide-angle adjustable nozzle has the optimum dust removal distance of 270 cm when the atomization angle of the aerosol is 47.5 degrees， which is very suitable for the dust removal system under the mine. In order to verify the dust removal effect of adjustable wide angle sprinkler with diameter of 1.5 mm， field experiments were conducted in Zijinshan Copper Mine to verify the dust removal effect of the sprinkler. The dust removal efficiency of the sprinkler is over 90%， which can greatly improve the working environment of mine workers and ensure their health.

Key words: Underground mine, Ore falling point, Transfer point, Dust control, Air-water nozzle, Selection of nozzle type