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通过对耐火材料、焦化、烧结、炼铁、炼钢以及机械铸造等作业场所进行呼吸性粉尘和总粉尘平行测定分析 ,对武钢作业场所呼吸性粉尘的危害程度作了了解 ,并探讨了呼吸性粉尘浓度与总粉尘浓度之间的关系。结果表明 ,呼吸性粉尘浓度和总粉尘浓度以耐火材料最高 ,分别为 4 2 8,1 4 7mg/m3 ;呼吸性粉尘和总粉尘游离SiO2 含量以机械铸造最高分别为 39 2 % ,32 8% ,粉尘危害较为严重。呼吸性粉尘浓度与总粉尘浓度比值平均为 1∶3 32 ,存在明显的相关关系 ,相关系数r在 0 6 0～ 0 96之间。呼吸性粉尘浓度与总粉尘浓度合格率分别为 44 5 5 % ,45 0 4% ;游离SiO2 含量在 1 0 %～ 5 0 %之间的呼吸性粉尘合格率与总粉尘合格率 ,分别为 30 6 7% ,1 7 33% ,两者之间有显著性差异 ,经 χ2 检验 ,P <0 0 1 ,反映2mg/m3 的总粉尘卫生标准在某种程度上较 1mg/m3 的呼吸性粉尘卫生标准严格。
Through the parallel analysis of respirable dust and total dust in operation sites such as refractories, coking, sintering, iron making, steelmaking and mechanical casting, the hazard degree of respirable dust in WISCO workplace was understood and the respiratory Relationship between dust concentration and total dust concentration. The results showed that respirable dust concentration and total dust concentration were the highest refractory materials, which were 428 and 147 mg / m3 respectively. The highest free SiO2 content of respirable dust and total dust was 39 2% and 32 8% , The dust damage is more serious. The ratio of respirable dust concentration to total dust concentration averaged 1: 32, there was a clear correlation between the correlation coefficient r between 0 6 0 ~ 0 96. Respiratory dust concentration and total dust concentration pass rate were 445 5%, 45 0 4%; free SiO2 content of 10% ~ 50% of the respiratory dust pass rate and total dust pass rate were 30 6 7% and 1 7 33% respectively. There was a significant difference between the two groups. Chi-square test (P <0.01) showed that the total dust level of 2mg / m3 was somewhat higher than that of 1mg / m3 respirable dust Strict hygiene standards.