Environmental Friendly Sand Production Line

Environmental Friendly Sand Production Line

The proportion of sand in the aggregate of commercial concrete is generally about 30%, and the amount of sand is relatively large. In the current environment where natural sand resources are exhausted and exploitation is limited, artificial sand has gradually become the trend and mainstream. In recent years, the aggregate of sand and stone develops rapidly and its scale is increasing day by day, but at present, most of the domestic quarries are small in scale and have many problems. How to keep a firm foothold in the highly competitive market, sandstone enterprises need to make some adjustments and improvements. The pollution of machine-made sand and stone production line is mainly dust and noise. The design shall strictly comply with the national and local environmental protection laws and regulations, ensure that the environmental protection facilities and engineering design, construction, production "three at the same time", ensure that the emission of various pollution factors meet the national emission standards, so that the surrounding environment is not affected or reduced to the minimum pollution level.

1. Dust prevention and collection measures

In the production of machine-made sand and stone, the dust produced in the process of material crushing, screening and transportation is generally called organized dust, and the secondary dust caused by open yard and automobile transportation is generally called unorganized dust. In the design, the principle of prevention first and prevention combined is generally adopted. Dust points shall be reduced as far as possible in each process link before medium and fine crushing, and conveying and feeding equipment with good airtight performance shall be used. Pay attention to the shape and angle of the material pipe when designing the material pipe connected with the equipment, and try to reduce the drop. High efficiency dust collector with high efficiency and reliable technology shall be adopted at all dust emission points to ensure that the dust emission concentration is lower than the national standard of 20mg / nm 3. Storage of intermediate material and soil waste is carried out by closed stack and spray dusting to reduce the impact of dust on the surrounding environment.

2. Noise control

The high noise sources of machine-made sand production line mainly include the mechanical noise produced by crusher and vibrating screen and the aerodynamic noise produced by air compressor. The source intensity is generally 85-115db (a). For the control of noise, the equipment with low noise shall be selected or equipped with muffler as far as possible to reduce the noise of the equipment. In addition, measures should be taken to control the transmission of noise. The workshop with strong noise source adopts closed workshop, and the greening outside the workshop is adopted at the same time. The noise production technology is isolated to varying degrees by its shielding effect, so that the noise value transmitted to the workshop 50m away is lower than 50dB (a). Meet the requirements of national noise control standard for plant boundary.

3. Wastewater treatment and sludge discharge (wet production line)

The wastewater is mainly domestic wastewater and sand washing wastewater. The domestic waste water is pretreated in the septic tank and other waste water is collected into the waste water treatment station of the plant area for treatment. After treatment, the waste water can be reused for the production line after meeting the reclaimed water reuse standard. The waste water from screen washing is recycled as production water after being treated by sand washing and waste water sludge treatment system. The sludge cake and waste soil produced by pre screening after sludge treatment are used in the mine reclamation cushion to achieve zero discharge of waste water and sludge. This link of the dry production line can be basically ignored, and the big end of the pressure is in the dust removal link.

4. Make small greening in the mine

Greening design shall be carried out for the project according to local conditions. Roadside trees and hedges shall be planted on both sides of the road. Turf and four seasons flowers shall be planted as far as possible in the open space around the workshop to fully beautify the environment and coordinate with the whole plant greening. The greening coefficient shall be controlled at about 15%, and the greening investment shall be included in the project budget.

5. Energy saving, environmental protection and money saving

In the design, in accordance with the relevant provisions of national energy conservation, energy conservation and rational utilization shall be achieved, and the energy conservation measures adopted by various disciplines such as technology, civil engineering and electrical engineering shall be coordinated with each other to give full play to the energy conservation benefits, so as to achieve the best overall energy conservation effect of the project. New energy-saving equipment and technology are adopted in the design, and backward products are discarded and eliminated.

Some suggestions on aggregate production line

  • (1) The product scheme shall be determined first according to the market conditions in the process scheme design. The success or failure of a gravel processing system mainly depends on whether the relationship among lithology, process flow and equipment selection can be reasonably solved. The lithology analysis of raw materials is generally determined by experiments: crushing work index, abrasion index, water content and mud content, and the process and equipment selection is based on this.
  • (2) The overall planning shall be divided into three-dimensional functional layout according to the process flow to minimize the occupation of land; there shall be enough safe space around the equipment for on-site maintenance operation; lifting devices shall be set above the equipment to facilitate maintenance operation; maintenance access shall be planned on the site to facilitate vehicle access; walkways and ladders for personnel access shall be set at the belt profile and each floor.
  • (3) With high degree of automation, the system can realize full-automatic operation through programming control, without manual interference except for special cases; the system can automatically make fault diagnosis and corresponding processing, and send out alarm information for the operator to solve.
  • (4) The closed-circuit water circulation system and sewage treatment system are adopted to realize zero discharge of sewage and ensure no pollution to the surrounding environment; all dust points in the plant are equipped with efficient dust removal facilities to ensure that the gas emission concentration meets the requirements of national standards; the roads and ground in the plant are hardened.
  • (5) Pay attention to safety design. All work points requiring personnel to enter or close to shall be designed with walkways and steps; all walkways and steps shall be equipped with safety handrails and guardrails; all equipment shall be equipped with manual emergency stop keys nearby, and all belt lines shall be equipped with manual emergency stop pull ropes; the motor shall be equipped with maintenance and open circuit protection; the dangerous parts shall be equipped with protective covers and marked with danger Danger warning signs.
  • (6) It is convenient for maintenance, with special spare parts inventory and maintenance center