To generate high-quality machine-made sand, the following points should be done:

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1. Parent rock selection

Machine-made sand comes from rock, and its quality is determined by the natural characteristics of the parent rock. To produce high-quality machine-made sand, the key is to ensure that the raw materials are of high quality. High-quality raw materials usually refer to rocks with high strength, low content of weathered rocks and soft rocks, few rock interlayers and interlayer clay, and low content of harmful substances.

2. Grain shape control

Poor-quality machine-made sand often has poor grain shape, sharp edges and corners, and too many needle-like particles, which is mainly due to the use of inappropriate processing equipment. In order to save costs, some companies only use hammer crushers and fine jaw crushers for crushing and sand making, resulting in poor quality of the finished sand. It is recommended to use professional sand making and shaping equipment such as Shibang vertical shaft impact crusher, which can produce more cubic and rounded machine-made sand.

3. Gradation control

Many machine-made sands have unreasonable gradations, often showing the phenomenon of "big at both ends and small in the middle". This is because the content of coarse particles above 2.36mm and fine particles below 0.15mm is too much, while the content of intermediate particle size is relatively small. The selection of appropriate sand making and screening equipment can effectively control the gradation so that the finished sand meets the standards of zone II sand.

4. Fineness modulus control

Generally, sand with a fineness modulus of 3.1-3.5 belongs to medium-coarse sand. As long as a reasonable sand production process is adopted, the fineness modulus of machine-made sand can be continuously adjusted, and medium sand with a fineness modulus of 2.3-3.0 can be produced according to production requirements.

5. Stone powder content control

It is inevitable that a certain amount of stone powder will be produced in the production process of machine-made sand. If the stone powder content is too high, it will affect the performance of concrete mortar, and the excess stone powder will also cause resource waste and environmental pollution. The use of reasonable sand making equipment and sand making process can reduce the stone powder content of machine-made sand and make the powder content adjustable and controllable between 5-15%.