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为了总结经验,为修改粉尘卫生标准提供科学依据,我们选择某钨矿,进行了低浓度粉尘与矽肺发病关系的调查,现报告如下, 一般情况 该矿是属高温热液裂隙充填型矿床,主要围岩为黑云母中粒花岗岩。其矿物组成为石英42％,长石50％,黑云母3％,绿泥石4％。化学成分:总含SiO_274.6％,其中游离SiO_231～41％,AL_2O_313.7％,1960年投产,平巷开拓井下采矿。建矿初期以风钻凿岩,手工装矿
In order to summarize the experience, to provide a scientific basis for the revision of the dust hygiene standards, we choose a tungsten ore, the investigation of the relationship between low concentration of dust and silicosis, are reported as follows, under normal circumstances the mine is a pyroclastic fissure filling deposits, the main Surrounding rock for the biotite granite granite. The mineral composition of quartz 42%, 50% feldspar, biotite 3%, chlorite 4%. Chemical composition: The total content of SiO_274.6%, of which free SiO_231 ~ 41%, AL_2O_313.7%, put into operation in 1960, the open pit to open up underground mining. In the early stage of drilling, the drill was drilled with wind and the ore was loaded by hand