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The respective advantages and disadvantages of sand and gravel aggregate dry, wet and combined dry and wet production processes

Release time:Apr.22.2024 Views:0

Sand and gravel aggregate dry,(stone crusher) wet and combined dry and wet production processes have their own advantages and disadvantages, and their applicable scope and conditions are also different. Only by fully understanding the characteristics of each process can we target different production conditions. Choose the optimal production plan. Let’s talk about the advantages and disadvantages of these three production processes.


Dry machine-made sand and gravel technology


Dry sand making technology is later than wet sand making technology. It is a technology further developed on the basis of the traditional wet sand making production line. Compared with wet sand making technology, it does not require a large amount of water during the sand removal process and mainly uses wind power. Method to remove powder.

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  advantage:


(1) Water consumption in production is very small, drainage and sewage treatment equipment are reduced, the production line process is short, the process is simple and easy to maintain, the layout is compact and the area is small, the total installed power is low, and construction and equipment investment are low.

(2) The moisture content of finished aggregate and artificial sand is low, generally not higher than 2%, which is conducive to screening. The sand formation rate is high and can be transported or used directly. It will not freeze when the temperature is below zero in winter and can be used all year round. Continuous production.

(3) The fine stone powder collected during the production process can be used as raw material for roadbed cushion or cement-free bricks. The resource utilization rate is high and zero emissions can be basically achieved.

(4) By adjusting the air volume and air pressure of the powder separator, the stone powder content in the finished sand can be controlled. Compared with the wet method, the sand production rate is higher, and it can also directly meet the mandatory requirements of civil construction engineering standards and urban construction-related standards. Requirements, the strength of concrete made from finished aggregate is relatively high.


  shortcoming:


(1) Dust is easily generated in all aspects of crushing, screening, transfer, transportation and storage, and strict requirements for equipment sealing and dust removal are required. Efficient and reliable dust removal equipment and dust reduction measures need to be used to ensure that the dust content of the purified exhaust gas reaches 5mg/Nm3. It meets national and local environmental protection requirements.

(2) It is necessary to effectively control topsoil organic matter, interlayers, weathered layers and other mud-containing layers during the mining stage, otherwise it will easily cause blockage and overload the dust collection system.

(3) If the ore contains a certain amount of soil, it will easily be screened during production in the rainy season, reducing production efficiency and product quality.

(4) The surface of the sand and gravel produced is not as clean as that produced by the wet method. There is a certain amount of stone powder remaining, the cleanliness is not high, and the surface feel is poor.

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Wet production process


Wet sand making is a water washing sand making mode using a sand washing machine. It uses hydraulic means to remove powder and removes a large amount of mud and powder in the sand through water washing, so that the powder content of the machine-made sand is lower.


  advantage


(1) During the production process, soil and stone powder are taken away by the water flow, resulting in less dust pollution and good environmental protection effect.

(2) The water washing and screening efficiency is high, and the surface of the finished sand and gravel aggregate is clean and has good sensory properties.

(3) The wet process does not have as high a moisture content in the raw materials as the dry process, and there are basically no special requirements.


  shortcoming


(1) The production process consumes a lot of water and the loss of fine sand and gravel powder is serious.

(2) The moisture content of the finished sand is high, the proportion of small particles is relatively small, the fineness modulus is relatively large, the moisture content cannot meet the requirement of less than 6%, and the sand output is low (a fine sand recovery system is required for this) .

(3) Since the finished product contains almost no stone powder, direct use will increase the amount of concrete cement and increase production costs.

(4) A large amount of drainage and sewage treatment equipment needs to be added, the process is relatively complex, the fine powder recovery and sewage treatment costs are high, the construction investment is large, and the unit cost of the finished sand and gravel aggregate is high.

(5) It is highly dependent on water resources and is only suitable for mining areas with relatively abundant water resources. It cannot produce normally in arid areas with little rainfall or in cold and freezing seasons.

(6) Apart from part of the by-product mud cake generated during the production process, which can be used for mine greening and reclamation, there is currently no other better use. Part of the mud cake needs to be discharged on site.


Dry-wet combined production process


The combined dry and wet method production process is a new process method that has only been applied in recent years. The investment cost is less than the wet method, but more than the dry method. The finished sand and gravel powder content is between the two, and the operating cost is also between the two. between.

The advantage is that part or all of the finished sand and gravel are no longer washed with water, so compared to the wet process, the water consumption is much less, and the content of the finished sand and gravel powder is correspondingly much higher.

Disadvantages: Since the moisture content of the sand-making raw materials is between 6% and 10%, it is particularly easy to cause screen holes in the screening equipment to be clogged, causing screening difficulties, which in turn will reduce the output of finished sand and increase the unit production cost.

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Nowadays, the concept of green mine construction promotes the development of environmental protection. Therefore, no matter which machine-made sand and gravel process route is adopted, environmental protection facilities and environmental indicators must be considered to meet the standards. The finished machine-made sand and gravel produced should also comply with national standards or industry standards. However, the choice of production process is important, and the choice of production line equipment is equally important.

Xingao Nai Heavy Industry can provide a complete set of equipment required for sand and gravel production lines. Since most production lines have different processing raw materials and finished product requirements, our complete sets of sand and gravel production lines have various configurations. Each sand and gravel production line is designed according to the user's project scale, It is configured according to the working conditions, finished material particle size requirements, raw material characteristics, output and energy consumption, etc., so as to achieve high-yield, efficient, green and environmentally friendly production line operation, allowing users to obtain higher profits in later use.

Different sand making processes have different application ranges, and the harvested benefits are also very different. If you are not sure how to choose, you can inform our online customer service of your needs. Our professional engineers will go to the production site to inspect, and then combine your requirements Based on actual production needs, we can design a suitable sand and gravel production line solution for you to help you quickly achieve profitability!