To clarify the pollution characteristics of high-temperature particles associated with the thermal process in the foundry workshop with local ventilation systems,the microscopic characteris-tics,concentration distribution and personal exposure of particles in different process post areas of a state-owned enterprise casting workshop were investigated by experimental tests combined with expo-sure calculation in present study.The results show that the dust particles have different shapes,de-veloped surface voids,large specific surface area,and contain a large amount of oxides of Fe,Al,Si,while carrying Mn,Ti,Cr and other carcinogenic heavy metal elements.In addition,it takes nearly 24 h for 10 μm particles to settle from a height of 10 m to the ground,and the concentrations of 2.5-micrometer particular matter(PM2.5)and inhalable particles(PM10)in different posts are 5-10 times that of the indoor concentration of various civil buildings.Under protective conditions,the daily intake of PM2.5 and PM10 of workers is between 5 and 10 times that of ordinary civil buildings.There-fore,the post environment in the casting workshops is still relatively harsh,and there is an urgent need to develop more effective protective tools and optimize the design of ventilation systems.
维普
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