Abstract: A leadzinc mine has developed 19 middle sections after years of mining and development.The lowest middle section is nearly 1 000 m above the ground,the length of the roadway is about 5 km,the ventilation environment is complicated,the system has insufficient air flow,the polluted wind is connected in series,and the temperature at the deep working surface increases rapidly problem.In order to optimize the relay ventilation system of the mine,through the investigation and measurement of the current status of the mine ventilation system,the problems and influencing factors of the ventilation system were analyzed,and the optimization scheme of the relay ventilation system for the north and south partitions was proposed.The ventilation effect of the design parameters,the results show that: the system's air intake,return air volume and the wind speed of each roadway can meet the requirements of relevant regulations and specifications,each fan has a higher operating efficiency and a reasonable operating point.

Key words: Underground mine,Ventilation system,Zoning ventilation,Relay ventilation