As a tracer gas,sulfur hexafluoride gas is widely used in the pressure prevention and fire extinguishing technology of ventilation field to detect air leakage passage and air leakage volume in goaf or fire area and determine the location of fire source in fire area.

　　The reason why sulfur hexafluoride gas can be widely used in the pressure prevention and fire extinguishing technology of ventilation field is that sulfur hexafluoride gas is a colorless,tasteless,non-toxic non-combustible gas.At the same time,the physical activity of the gas,in the disturbed air can be quickly mixed and evenly distributed in the detection space,it is insoluble in water,does not settle,does not condense,is a good negative gas.

　　The original content of sulfur hexafluoride in the atmosphere and mine environment is very low,about 10-14~10-15g/ml,and its detection sensitivity is high,the detection accuracy can reach 8×10-9.These properties of sulfur hexafluoride gas make it convenient and accurate to use it in mine air leakage detection.At present,sulfur hexafluoride tracers are widely used at home and abroad to study the traces and rules of gas flow.The channel,direction,wind speed and volume of air leakage can be detected by instantaneous release and continuous and stable quantitative release of sulfur hexafluoride.

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