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通过对１９９５ 年至１９９７ 年某钢铁企业８ 个厂矿的卫生检测资料进行分析， 发现近三年来该企业的粉尘检测样品合格率有逐年提高趋势， 但样品的年平均浓度逐年下降趋势不明显， 韩旺铁矿、浇铸和烧结厂粉尘污染较重。韩旺铁矿和浇铸厂粉尘中的游离二氧化硅含量超过１０ ％ ， 分别为３２－９ ％ 和２２－１ ％ ， 样品合格率最低分别为１８－２ ％ 和１３－３ ％ ； 烧结厂的粉尘样品平均浓度最高为５５－２ ｍｇ／ｍ３ ， 样品合格率也较低为４８－０ ％ ； 炼铁厂的粉尘平均浓度也超过国家卫生标准为１６－９ ｍｇ／ｍ３ ； 其余各厂的粉尘危害相对较轻
Through the analysis of the health inspection data of 8 factories and mines in an iron and steel enterprise from 1995 to 1997, it is found that the passing rate of dust testing samples of this enterprise has been increasing year by year in the past three years, but the annual average concentration of samples has not decreased significantly year by year. Mong iron ore, casting and sintering plant dust pollution. Hanwang iron ore and casting plant dust in the free silica content of more than 10%, respectively, 32-9% and 22-1%, the lowest sample rates were 18-2% and 13-3%; sintering plant The highest average concentration of dust samples was 55-2 mg / m3, and the passing rate of samples was also lower at 48-0%. The average dust concentration of ironworks also exceeded the national health standard of 16-9 mg / m3. The dust of other factories Harm is relatively light