Environmental protection design of sand production line
In recent years, the pollution problem of sand and gravel plants has been serious. Many sand and gravel plants have been closed and the supply of machine-made sand is in short supply. As long as the standard environmental protection design is passed, dust, noise and waste water pollution problems can be eliminated and environmental protection standards can be ensured.
1. Dust suppression
The dust generated in the production process of machine-made sand is generally called organized dust, and the secondary dust caused by open storage yard and transportation is generally called unorganized dust. The state stipulates that the dust emission concentration should be lower than 30㎎/m3, and the specific suppression measures are:
① Choose equipment with less dust and good airtightness, add a high-pressure spray system at the jaw breaker pit and vibrating feeder, and install a bag-type dust collector at the feed opening of the production line.
②In the transfer link of belt conveying materials, minimize the material drop, control the conveying speed, and reduce the escape of dust.
③Measures such as spray humidification and sealed storage at material loading and unloading and stacking points to reduce dust.
2. Noise control
The national regulations on noise in industrial areas are: less than 65dB(A) during the day and less than 55dB(A) at night. To control noise, it is necessary to start with crushing and screening equipment, try to choose low-noise new process equipment, reduce noise from the source, and install mufflers, sound insulation covers, etc. on the equipment to further reduce noise. And equip field workers with earplugs, earmuffs, etc. to ensure the health of the workers on the job.
3. Wastewater treatment
The waste water generated in the sand making process is mainly water for washing sand. A sedimentation tank can be built for treatment. A mud storage bucket is installed at the entrance of the sedimentation tank. The waste water flows in from one end of the sedimentation tank, and then flows out from the other end. Water can be reused for sand washing to realize waste water recycling, which not only meets environmental protection requirements, but also saves water resources. The deposited sludge and waste soil can also be used for the reclamation of mine cushions.
According to the production line designed according to the above method, the machine-made sand produced is of high quality and widely sold, and the entire production process is green and environmentally friendly, achieving the goal of sustainable profitability for the long-term development of the sand and gravel plant.
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