So, in the process of dry sand making, how should we control the dust emission?
With the national environmental protection control of the sand and stone industry increasing, many new sand production lines adopt closed production scheme, that is, production in the workshop or shed to control dust discharge.
At present, the new tower type sand making system in the field of sand making adopts the fully closed production mode, which does not need to build an external workshop, and can also achieve the purpose of dust emission control. According to the actual production statistics, the dust emission concentration of sand making building can be controlled at 20mg / m3, which is lower than the national environmental protection regulations.
2. Atomization humidification
In the production process, the impact dust is easy to be raised in the parts with large drop. If the water content is allowed, the dust formed by material impact can be reduced by material humidification and high-altitude atomization.
3. Install dust remover
It is also necessary to install dust remover in production line. Many production lines are equipped with multiple dust collectors to collect excess dust, control dust emission concentration and keep workshop clean.
4. Wastewater treatment
No water is needed in the production process of dry sand production line, but the finished manufactured sand is generally washed by the sand washing machine to further improve the quality of machine-made sand and make it comparable to river sand, and the product waste water will be produced in the sand washing process.
The amount of waste water is small, and the content of suspended solids is low. The treatment process of natural sedimentation in sedimentation tank can be used to treat the production wastewater, and the upper clarified water is recycled to save water.
For a sand production line, the environmental protection situation of the whole production line is basically controlled from two aspects of dust and wastewater, which is conducive to passing the EIA, and can also deal with the inspection of relevant government departments to achieve legal and compliance production.