向山硫铁矿是一个有近四十年井下开采历史的矿山。矿石属硅化、高岭土化、绿泥石化浸染状黄铁矿。矿石中二氧化矽含量平均为25％以上,粉尘中游离二氧化矽含量为7.32～16.1％,平均11.4％。多年来,通过采取综合防尘措施,井下工作面粉尘浓度不断下降,近期平均为2.4～4.0毫克/米~3,合格率达国家标准的占70％以上,显著减少了粉尘对井下职工的危害,促进了生产发展。 一、通风措施 针对矿石松软,大量用水降尘会造成矿石粘结,给矿石装运带来困难的特点,措施 Xiangshan pyrite is a mine with nearly 40 years of underground mining history. Ore is silicified, kaolin, chlorite impregnated pyrite. The average content of silica in the ore is above 25%, and the content of free silica in the dust is from 7.32 to 16.1% with an average of 11.4%. Over the years, by taking comprehensive dust control measures, the concentration of dust on the working face in the mine has been declining. The recent average is 2.4 ~ 4.0 mg / m ~ 3, and the passing rate is over 70% of the national standard, which significantly reduces the harm of dust to underground workers , Promoted the development of production. First, the ventilation measures For loose ore, a large number of water dust will cause ore bonding, to the difficulty of ore loading characteristics, measures