江安县硫铁矿厂是我省生产硫精砂的主要厂矿之一,现在职工1000余人。井下凿岩经历了人工手锤打眼、手摇掰钻打眼、电钻扣眼,1979年后逐步采用湿式风钻. 从1964年起对接尘工人进行X线摄片检查,由地区矽肺诊断组诊断。近年来对接尘工人每三年摄片检查一次,1—I和I期矽肺患者每年摄片检查。粉尘浓度测定采用滤膜重量法,游离SiO_2含量用焦磷酸法,分散 Jiang’an County pyrite plant is one of the major factories and mines producing sulfur concentrate in our province, and now employs more than 1,000 people. Downhole drilling experienced artificial hand-hammer drilling, hand-cranked drill drill, diamond-studded electric drill, and gradually adopted wet pneumatic drill after 1979. From 1964 onwards, X-ray examination of workers exposed to dust was diagnosed by the regional silicosis diagnostic group. In recent years, workers exposed to dust every three years radiography once, 1-I and I patients with silicosis annual radiography. Determination of dust concentration using the filter weight method, free SiO2 content with pyrophosphate method, dispersed