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尘肺发病趋势的预测,对于制订尘肺防治规划,指导今后工作具有重要的意义。本文试用寿命表方法对某煤矿尘肺发病趋势进行了预测,报道如下:一般情况该矿为一具有60余年开采史的老煤矿。未开展防尘工作前,井下平均粉尘浓度高达276.5mg/m~3;1963年推行湿式作业后,井下平均粉尘浓度降为16.3mg/m~3(据1963～1981年5,451个测尘资料的统计)。粉尘分散度5μ以下者占87～93％。围岩中平均游离二氧化硅含量
The prediction of the incidence trend of pneumoconiosis is of great significance for the formulation of a pneumoconiosis prevention and control plan and guidance for future work. In this paper, the life table method is used to predict the incidence of pneumoconiosis in a coal mine. The report is as follows: In general, the mine is an old coal mine with a mining history of more than 60 years. Before the dust prevention work was carried out, the average downhole dust concentration was as high as 276.5 mg/m 3 . After the wet operation was implemented in 1963, the average downhole dust concentration was reduced to 16.3 mg/m 3 (according to 5,451 dust measurement data from 1963 to 1981. statistics). Dispersion of dust less than 5μ accounted for 87 to 93%. The average free silica content in the surrounding rock