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某花岗石厂引进的花岗石生产线,1988年2月试生产时,锯机车间粉尘污染严重,工程验收时因不符合卫生要求,未通过验收。该生产线是1987年从意大利引进的。两台SB型摆式框架锯机,采用砂泵自动供浆循环喷浆防尘,其喷浆装置安装在砂锯的顶部,喷浆口距石料3m,适于加工2.2m高的石料板材。但实际上石料装锯高度多在0.9～1.3m,锯机喷浆口距石料1.7～2m,造成砂浆飞溅,加上摆式框架的运转,整个车间粉尘飞扬。1988年2～9月对车间粉尘作业点采样测定,19个样品中,浓度为2.5～34mg/m~3者16个(粉尘中游离二氧化硅含量均在10％以上),2mg/m~3以下者3
A granite factory introduced granite production line, February 1988 trial production, sawing workshop dust pollution, engineering acceptance due to non-compliance with health requirements, failed to pass the inspection. The line was introduced from Italy in 1987. Two SB-type pendulum frame sawing machine, the use of automatic sand slurry pump slurry spray dust, the spray device installed in the top of the sand saw, spray nozzle from the stone 3m, suitable for processing 2.2m high stone sheet. However, in fact the height of the stone loading saws is more than 0.9 ~ 1.3m, the sawing machine shotcrete distance 1.7 ~ 2m away from the stone, resulting in mortar splashing, coupled with tilting frame operation, the dust of the entire workshop. From February to September, 1988, dust samples were measured in the workshop. Among 19 samples, 16 samples with 2.5 ~ 34 mg / m ~ 3 concentration (the content of free silica in the dust were more than 10%), 2mg / 3 the following 3