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Factors affecting the quality of finished materials in the sand and gravel production line

Release time:Apr.08.2024 Views:0

Everything is graded, and sand and gravel aggregates are no exception. The content of flat and oblong particles in the finished materials of the sand and gravel production line directly affects the quality of the finished products. Let’s talk about the factors that affect the quality of finished materials.


Parent rock properties


The quality of finished sand and gravel aggregate is first determined by the quality of the parent rock. The strength, mineral composition, rock structure and chemical composition of the parent rock are different, which has an important impact on the energy consumption of the equipment, the stone powder content and particle shape of the finished product. Another factor is the cleanliness of the parent rock. When choosing sand mines, choose mines with less impurities such as soil and light substances and good rock integrity. During mining, there will be relatively less impurities and sediment mixed in. It is also easier to control the mud content of machine-made sand and gravel to ensure the quality of finished sand and gravel aggregates.


Equipment selection


The control of sand and gravel quality first needs to start from the source. The source is mainly the selection of sand and gravel equipment, which will directly affect the quality indicators of finished product particle size, mud content, finished material grade and taste. Equipment selection can make corresponding equipment configuration and process design plans based on the size of the raw materials and the needs of the production line. In these plans, how to combine the jaw crusher, cone crusher, impact crusher, sand making machine and other equipment depends on the material properties and production capacity. Adapt based on size and finished product granularity.

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Crushing ratio


The crushing ratio refers to the ratio of the particle size of the imported material and the crushed finished product. The greater the ratio, the greater the crushing ratio, and vice versa. If the crushing ratio is too small, the needle flake content will increase. If the crushing ratio is too small, the output of the entire system will decrease, the internal circulation volume will increase, the wear of the crusher will increase, the economy will be poor, and the production efficiency will be low. (The rule has nothing to do with the crusher model and is applicable to most crushers)


Feed particle size


For crushers, different types or models can process different sizes of input materials. If the input particle size is inappropriate, it will also cause the discharge quality to be substandard, so the input particle size must meet Production equipment requirements.


Feeding speed


Unstable and insufficient material supply will cause the stone to be affected by the lining plate and the outer lining plate in the crushing cavity, and easily form needle-like and flaky shapes. If the feed supply is sufficient, the material entering the crushing cavity will be layered. Crushing, forming extrusion, crushing and grinding between materials, is conducive to forming a better particle shape of finished materials, so constant feeding is the key to improving the quality of finished materials.


Open and closed loops


In the secondary crushing process, the cycle is divided into open cycle and closed cycle. Open cycle (screening first and then crushing) means that the materials after primary crushing are screened through the finished product screen and then enter the secondary crushing feed port. Crushing, so that the output of finished materials increases, and the content of needle flakes also increases; closed cycle (crushed first and then screened) means that all the materials crushed in the first level are put into the feed port of the secondary crusher, and then crushed again. The finished product screen is used for screening. The entire system is a closed system, with no loss of crushed materials and a large cycle load, but the product has good particle shape. In the actual production of the crusher, open circuit or closed circuit circulation can be selected according to production needs.


Discharge opening size


When the discharge opening is larger than the particle diameter, the needle flake content is lower than when the discharge opening is smaller than the particle diameter. This is because for the same feed opening, the discharge opening is small and the crushing ratio is large, so the particle shape becomes worse, so when the discharge opening is The particle shape is best when the mouth is adjusted to be consistent with the particle size of the finished material.

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Screen selection


In order to ensure better quality of finished materials, production should be carried out strictly according to the requirements of aggregate particle size, and the screen mesh should be selected according to the gradation to achieve matching, thereby ensuring that the finished sand and gravel aggregates meet quality standards and regulations.

In summary, the quality of finished machine-made sand and gravel aggregate is affected by many factors. Therefore, in the sand and gravel production line, appropriate production line equipment should be selected according to the characteristics of the parent rock, and the production conditions of the sand and gravel production line should be comprehensively considered. Reasonable equipment performance settings can effectively ensure better finished product quality and achieve better production efficiency.

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As my country's sand and gravel aggregate processing industry expands from small to large, and environmental protection requirements become more and more stringent, in order to improve its own efficiency and development, the quality of sand and gravel aggregates should be controlled to produce high-quality machine-made sand and gravel aggregates. Xingao Nai Heavy Industry focuses on the field of sand and gravel aggregate crushing. It can provide the equipment and program design required for sand and gravel aggregate production lines with an output of 100-6,000 tons per hour for the infrastructure industry, mining crushing, industrial sand making, green building materials and other fields. It has tens of thousands of A partner and service provider that customers trust.