In order to reveal the deposition law of pyrrhotite dust in human respiratory tract at construction site,and propose effective occupational disease protection measures,we took the pyrrhotite sample in the sampling roadway of a metal mine in Anhui as research object and establish a three-dimensional model of human respiratory tract.Then,under different concentrations of pyrrhotite dust and different work areas,we simulated the particle deposition in human respiratory tract during the transportation and shoveling processes.The results showed that the pyrrhotite under different respiration intensities,processes,and particle sizes is mainly deposited in the throat and trachea of the human body.When the particle size is greater than 5.456 μm,that is,the operator is close to the tuyere in the tunnel,all the mineral dust will be deposited in the respiratory tract of the human body.The total particle deposition rate of the respiratory tract will first decrease with the increase of particle concentration and then fluctuate steadily.And the total particle deposition rate will increase with the increase of particle size and respiratory intensity.The farther the distance from tuyere in the tunnel,the smaller the total particle deposition rate.Based on the deposition law of pyrrhotite dust on the respiratory tract of the human body and actual working conditions,corresponding protective measures are proposed.

pyrrhotite dust  /  human respiratory tract  /  depositional law