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我矿是一个地下开采磷矿石的企业,是全国重点化学矿山之一。1961年建矿,现职工4000多人。磷矿层及顶底板围岩中含硅量超过10%,属于矽尘危害的矿山。为了掌握情况,及时采取措沲,从1978年开始,开展了粉尘浓度监测工作。1978年粉尘浓度合格的产尘点仅占22.7%,最高的达229.5mg/m~3,平均为8.72mg/m~3,均超过国家标准。从粉尘的分散度来看,小于10μm 的占95.4%,其中小于5μm 的占68.8%。
Mine is an underground phosphate rock mining enterprises, is one of the country’s key chemical mines. Construction in 1961, now more than 4,000 workers. Phosphate rock and roof and floor rock in the silicon content of more than 10%, belongs to the mine hazards of silica dust. In order to grasp the situation and take prompt measures, dust concentration monitoring has been carried out since 1978. In 1978, dust-producing dust spots only accounted for 22.7%, the highest reached 229.5mg / m ~ 3, an average of 8.72mg / m ~ 3, all exceeding the national standard. From the degree of dispersion of dust, 95.4% is less than 10 μm, with 68.8% less than 5 μm.