Dry Sand Production And Processing Technology

Dry sand production is not restricted by water sources and the environment, and can also be carried out in places where water resources are scarce to reduce water pollution. In addition, the dry process only removes particles smaller than 75um, and the various particles are evenly graded, and the gradation zone line is good. With the application of tower-type sand-making systems, dry production has gradually become a more popular sand-making process in the current market.

In engineering applications, the amount of crushed stone accounts for more than twice the amount of sand. The establishment of a separate sand factory with a large investment and limited supply is not economically economical. On the basis of the crushed stone production and processing system, an increase of one A set of vertical shaft impact crusher (sand making machine) and a set of dust removing device, the returned material crushed by the jaw crusher and some stones with different particle diameters enter the sand making machine to separate the stone powder that does not meet the grading requirements. Formation of mechanism sand.

Mine selection pays attention to wind direction

For mines with thicker soil layers, more mud in the interlayer, lower parent rock strength, lower dolomite content, and layered rocks into flakes, avoid in-situ plant construction. When choosing a mine, the wind direction and the influence of wind speed should be considered, and it should be selected near the mountainous wasteland. The wind speed is small, and the dust should not fly to the village or farmland. The reserves of Shishan meet the requirements. The higher the strength, the better. The strength of the wool base material must not be lower than 80MPa. To this end, reserves, strengths, and mining ranges are analyzed through geological drilling.

Reasonably designed machinery and equipment installation and stone storage site are extremely important. According to the terrain conditions and wind direction, the equipment is arranged in steps along the mountain. The initial crushing should be arranged on the uppermost step in the mining direction, the second crushing and screening equipment should be arranged on the next step, and the finished product discharge should be arranged on the lowest step, so that production and discharge do not interfere with each other, which is environmentally friendly and economical.

The power line design fully considers the power load

The power consumption of the stone yard production is large, usually a sand-stone co-production unit with a production capacity of 180 ~ 200t/h has more than 1000kV.A. When designing the transformer capacity, we must consider the affluence of all equipment when they are enabled at the same time. The line design is preferably not less than 50mm².

The soil removal device is indispensable

The ore wool is loaded into the silo by the loader, and enters the jaw crusher through the vibrating feeder. Crushed stones and soil blocks below 100mm are roughly selected by the feeder and do not enter the jaw crusher, and are sorted to the feeder In the lower silo, the belt conveyor conveys it to the vibrating screen installed on the chute for screening. The stone below 20mm is basically soil. It is classified as discarded. Crushed stone above 20mm and the stone after the initial break directly enter the transition bin , Effectively prevent the mixing of soil and impurities. In this way, the mud and soil in the wool can be removed, and the mud content of crushed stone and machined sand is basically well controlled.

Selection of sand and stone materials

After processing several kinds of stone from crushed stone, choosing which grade of stone to enter into the sand making machine is a crucial step for whether it can produce qualified machine sand and increase the output. After the stone is crushed, the secondary crushed stone debris accounts for about 30% of the total production, and the stone below 0.075mm accounts for about 25% of the stone debris. If the stone chips enter the sand making machine again, there will be more stone powder below 0.075mm and more waste will be generated. It is not cost-effective to produce sand. Mechanism sand.

Quality assurance measures

  • 1. When the stone enters the feeding port, the rod feeder is used to remove the soil to prevent the produced sand from exceeding the standard mud content, and the problem of mud content is solved from the source.
  • 2. The storage site is hardened to prevent mud from mixing into the machined sand during loading.
  • 3. Water mist is sprayed on the top of the machine sand belt conveyor, so that the small particle powder in the machine sand with the powder content that meets the requirements of the powder separator adheres to the large particles to prevent the separation of stones of different particle sizes when falling. Or use the method of reducing the stack height to reduce segregation.
  • 4. The crushed stone used for the production of machine-made sand adopts the impact crusher to return to the cage to avoid the low crushing index of the machine-made sand and control its mud content.
  • 5. When the dry production method is adopted, the air flow rate of the fan is measured, and the air volume is fixed after the commissioning operation is normal, so that the content of the produced sand powder is controlled in a relatively stable state. When wet production is used, the water flow rate and the inclination of the sand washer are measured. While the stone powder is being washed away, larger particles of sand are not washed away, resulting in grading that does not meet the requirements. When using a sieve to remove stone powder, a sieve with different apertures and meshes with different areas are mixed and installed. After repeated screening, the content of stone powder is adjusted to determine the size and area of ​​the screen to ensure the production of qualified machine sand.
  • 6. The production of machine-made sand is equipped with corresponding test equipment, and the stone powder content and mud content index are measured at least once a week to strictly control the quality of the site to avoid unqualified shipment to the construction site.

The production and processing technology of dry sand making with machined sand is simple and practical, which can reduce the pollution of water resources, help protect the environment, easily control the grading of machined sand, and reduce production costs.

Relate Project

* Standardized Design Of Artificial Sand Production Line

* Difference Between Natural Sand And Artificial Sand

* How To Improve The Quality Of Machine Sand

* Factors Of Low Sand Production Of Sand Making Machine

* Improve the Performance of Sand Making Machine

* Application Of Large Sand Making Machine

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