摘要
本文分析了叶腊石矿尘与雕刻尘主要化学成份和接尘工人尘肺患病危险性,并进行预期尘肺发病率预测和容许浓度推算。结果表明;叶腊石尘属游离SiO_2含量在10％以上的混合矿物尘,但矿尘中游离SiO_2含量(=33.24％)明显高于雕刻尘(=14.48％)Al含量则相反,金属元素含量差异较大。叶腊石尘尘肺现患病率=33.63％,而接触矿尘工人尘肺患病危险性明显大于雕刻尘接触者,且发病工龄短,病变程度重,进展速度快。建议:叶腊石矿尘的MAC值为2mg/m^3,叶腊石雕刻尘为4mg/m^3。
This is a report of the mineralogical analysis of (pyrophyllite dust P dust), the risk of developing pyrophyllitesis among workers exposed to P dust and the hygiene standard setting of P dust. P dust is a mixed mineral dust in which the content of SiO_2 is more than 10% and greatly higher in pyrophyllite mine(PM) dust (=33.24%)than in pyrophyllite carve mill (PCM) dust (=10.4%),but Al is lower in PM dust. The prevance rate of pyrophyllitosis is 33.63%. The risk of developing pyrophyllitosis, however, was significantly higher in workers exposed to PM dust than in those exposed to PCM dust, and a rather rapid progression of pyrophyllitosis was found in workers of PM. It is suggested that 2mg/m^3 and 4mg/m^3 are considered as the MAC of P dust, respectively in PM and PCM.
关键词
叶腊石
尘肺
粉尘容许浓度
Pyrophyllite Pneumoconiosis Maximum allowable concentration (MAC)
