The advantages and disadvantages of the dry sand production process in the process of generating sand and gravel aggregates are as follows:

Main advantages

(1) The moisture content of the finished aggregate and artificial sand is low, generally not higher than 2%, and can be directly transported or used. It will not freeze when the temperature is below zero in winter, and can be produced continuously throughout the year.

(2) By adjusting the air volume and air pressure of the powder selector, the stone powder content in the finished sand can be controlled. Compared with the wet method, the sand production rate is high, and it can directly meet the mandatory requirements of civil engineering construction standards and urban construction standards. In addition, the concrete strength produced by this finished aggregate is relatively high.

(3) The fine stone powder collected as a by-product during the production process can be used as a roadbed cushion or raw material for cement unburned bricks, with high resource utilization and basically zero emissions.

(4) Since water is basically not used in the production process, water supply and drainage and sewage treatment equipment are reduced, and the system is relatively simple, so the investment is small, the area is small, the number of operators and managers is small, the production capacity is large, and the production cost is low.

(5) The processing process is short, the equipment is simple and easy to centrally control, and it is relatively easy to realize automated or unmanned production operation. (6) By controlling the content of soil, weathered rock and organic matter during the mining stage, dust collectors are used at all levels of crushing and screening to collect dust. The finished sand and gravel aggregates can basically meet the standards of water conservancy projects and urban construction without the need for additional powder separators.

Main Disadvantages

(1) It is sensitive to the content of impurities such as soil and organic matter in the raw materials. The content of impurities such as soil should be strictly controlled. Otherwise, it is very easy to cause blockage and overload of the dust collection system.

(2) There is a certain amount of stone powder residue on the surface of the product aggregate, the cleanliness is not high, and the appearance is poor.

(3) A lot of dust will be generated in the stone crushing, screening and artificial sand making stages, and the equipment sealing and dust removal requirements are relatively strict. Dust is also easily generated at conveying equipment such as belt conveyors. According to current environmental protection emission requirements, the main production equipment and conveying equipment are required to be arranged in a fully enclosed factory building.