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Investigation on occupational health protective ventilation facilities at a rare metal factory

LI Nan-chun;CHEN Rui-mei;HUANG Xu;Department of Occupational Health Monitoring,Qingyuan Center for Disease Control and Prevention;  
Objective To investigate the status and effect of the occupational health protective ventilation at a rare metal factory. Methods The factory was investigated to know the production technology,the occupational hazards and the facilities of the industrial ventilation. The industrial ventilation and the occupational hazards were tested. Results The main occupational hazards were cadmium and its compounds,tellurium and its compounds. The air distribution of the general ventilation in the work rooms was piston air. The average person's fresh air rate was 250- 343 m3/ h,and it met the requirement of health standards. The frequency of general ventilation air change at the distillation area,the powder of cadmium area,the synthesis area and the crush area were 13. 7 time / h,15. 1 time / h,11. 5 time / h and 11. 3 time / h respectively. Except the synthesis area and the crush area which frequency of air change were lesser than 12 time / h,all the other frequency of general ventilation air change of the workshop met the requirement of health standards. The range of the air velocity of the exhaust hoods was 0. 85- 2. 96 m / s,and the air velocity was instability at the exhaust hoods. The passing rates of the concentrations of cadmium in the distillation area,the synthesis area,the powder of cadmium area and the crush area were100. 0%,77. 8%,83. 3% and 66. 7% respectively. The concentrations of tellurium in all the working room met the requirement of health standards. Conclusion The facilities of the industrial ventilation were effective in some ways to prevent occupational hazards,but it should be improved further,and it should be kept in good repair further.
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