As an independent industrial system, the aggregate production plant has its own distinctive features compared with other mature industrial categories. Its main features are: diversified types of raw materials (parent rock), diversified product types and uses, and diversified crushing and screening equipment.
In view of the above characteristics of the sand and aggregate processing plant, the key to the process design is to make a comparison of various plans. Designed from the perspectives of the stability of production and operation (dry method, wet method and combination of dry and wet), product quality stability (selection of auxiliary equipment such as crushing, screening, sand making equipment, conveying equipment), investment cost and operating cost Develop the optimal process plan.
In this article, we focus on the selection of crushing equipment and screening equipment in the aggregate production process.
Selection of crushing equipment
Before choosing the crushing equipment for the aggregate production line, it is necessary to survey and test the raw materials to understand the basic physical and chemical properties, types and distribution of the parent rock. Select appropriate crushing equipment and wear-resistant parts based on the compressive strength, impact index and abrasion index of the rock.
Selection of crushing equipment based on hard rock
For hard rocks such as granite, basalt and tuff, you can choose a combination of compression crushing equipment consisting of a gyratory crusher, a jaw crusher and a cone crusher.
Selection of crushing equipment based on medium hard or soft rock
For limestone, dolomite and other medium and low hardness rocks, there are many combinations of optional equipment. Such as:
- Compression crushing equipment combination consisting of gyratory crusher, jaw crusher and cone crusher.
- A combination of crushing equipment composed of compression crusher and impact crusher.
- A combination of crushing equipment consisting of impact crushers.
- A combination of impact crushing equipment composed of hammer crushers.
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Special attention should be paid to the selection of aggregate crusher for medium-hard sedimentary rocks. It is necessary to have a full understanding of the geological conditions of the mine, perform multiple tests on the material properties of the parent rock, and strengthen field inspections to determine the most suitable aggregate production line. The selection scheme of crushing equipment.
Screening equipment selection
Common screening equipment includes circular vibrating screen, linear vibrating screen, composite screen, gravity probability screen, hydraulic high frequency screen and so on. All kinds of screening equipment have advantages and disadvantages. The selection needs to be compared according to the specific working conditions. The selection of the screen type should also be paid attention to. At the same time, it is recommended that the selection should have a certain margin, and the circulating screen should consider the changes in the crushing system working conditions circumstances that lead to increased circulation.
Read Also: What is inclined vibrating screen
The following factors need to be considered when selecting screening equipment: the particle size distribution curve of the feed, the mud content of the feed, the water content of the feed and the classification requirements of the finished product.
The key point of the process design of the aggregate production plant is to compare the selection of various crushing and screening equipment and the process route, and the comparison of the schemes runs through the whole project design and every detail.
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