In recent years, machine-made sand and gravel have played an increasingly important role in infrastructure construction projects and have gradually become the main source of construction sand, which has greatly promoted the development of machine-made sand and gravel production equipment. As the concept of low-carbon environmental protection based on low energy consumption, low pollution, and low emissions continues to deepen, the government has stepped up its macro-control on various industries, especially the machine-made sand and gravel industry. In this context, how to do a good job in the design of the sand production line?
There are two main types of machine-made sand and gravel production processes: two-stage crushing and three-stage crushing. Small-scale machine-made sand and gravel production lines mostly use two-stage crushing and screening processes. Some large-scale machine-made sand and gravel production lines mostly use three-stage because of large material lumpiness. For the crushing and screening process, the four-stage crushing and screening process is relatively rare.
The equipment of the two-stage crushing process mainly has two process configurations:
1. Jaw crusher + impact crusher;
2. Jaw crusher + cone crusher.
The crushing ratio of the second-stage crushing process is generally about 15 to 25, the total crushing ratio is not large, and the amount of crushed ore is not much, often less than 1,000 tons per day, except for the use of large crushers. As far as the two-stage crushing process is concerned, most sand and gravel plants usually adopt a two-stage one-closed-circuit process, that is, the second-stage crusher and the inspection and screening equipment form a closed circuit, so as to ensure that the product size meets the requirements and meet the requirements of sand and aggregates.
The equipment of the three-stage crushing process mainly has 4 process configurations:
1. Jaw crusher + impact crusher + impact plastic sand making machine;
2. Jaw crusher + hydraulic cone crusher + impact plastic sand making machine;
3. Medium crushing cone crusher + fine crushing cone crusher + efficient sand making machine;
4. Coarse crushing impact crusher + fine crushing impact crusher + impact plastic sand making machine.
The three-stage closed-circuit process, that is, the third stage is divided into a closed circuit with an inspection screen, which is the most common crushing and screening process. The total crushing of this production process is relatively large; up to about 25-200, and the maximum feeding particle size can reach about 1000 mm. The product size of crushed ore can reach 12 mm or smaller, so it is suitable for large and medium aggregates production line.
The full set of machine-made sand and gravel production equipment is mainly composed of feeding equipment, crushing equipment, screening equipment, conveying equipment, etc. According to the special requirements of the user's required discharge particle size and grain shape, it can also be equipped with impact-type sand making machine and other sand making machines shaping equipment. At the same time, in order to protect the environment and cater to the low-carbon environmental protection situation, some machine-made sand and gravel production lines are also equipped with auxiliary dust and noise reduction equipment.
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