Aggregate is a general term for materials such as sand, gravel, crushed stone, in hydraulic engineering. It is also a major raw material in the field of construction. The aggregate crushing plant used for gravel aggregate production processing. The limestone aggregate is widely used after crushing and screening. The aggregate production process mainly includes coarse crushing, fine crushing, screening and conveying. With the rapid development of the construction industry, the demand for manufactured sand, crushed stone, and other aggregate are growing. Aggregate crushing equipment has also become a hot large-scale machine on the market.
Aggregate crushing processing
1. Use jaw crusher or hammer crusher for primary crushing to crushing rock materials. Jaw crusher has a larger production capacity and efficiency which can crush the raw stone into coarse aggregate.
2. The coarse aggregate is uniformly, quantitatively and continuously conveyed to a fine crusher (impact crusher or cone crusher) by a vibrating feeder for the secondary crushing to obtain a smaller stone particle size.
3. Sand making machine crushes the crushed aggregate into several sizes. Then the circular vibrating screen screening out these sizes of aggregates. If you want to get clean construction sand aggregate, we need to wash the aggregate with a sand washing machine.
Aggregate crushing plant equipment
The aggregate production processing mainly consists of vibrating feeder, jaw crusher ( select different crushing equipment according to production requirements), screening equipment, sand making machine, belt conveyor, bucket elevator and other equipment. The crushing operation mainly breaks the big sand aggregate into small particles, which is convenient for the sand making processing. The purpose of screening is to control the size of aggregate.
Affecting aggregate factors
Whether it is jaw crusher, impact crusher, cone crusher, impact crusher, and other crusher equipment are often used equipment in mineral processing, crusher plant, sand plant, construction, and other industries. The production quality of the crusher directly affects the quality of the aggregate. What are the factors that affect the quality of the discharged particles from the crusher?
1. Crushing ratio
The crushing ratio is the ratio of the feed size to the finished product size. The larger the ratio, the larger the crushing ratio, and vice versa. The ratio of breakage is large, and the content of needle flake is increased. Moreover, this law applies not only to the jaw crusher but also to the cone crusher. However, if the crushing ratio is too small, the output of the whole system decreases the internal circulation increases, the crusher machine wear increases, poor economy, low production efficiency.
Therefore, in the aggregate production processing, it is very important to select the appropriate crushing ratio. JXSC produces a variety of crushers which superior quality and affordable price.
2. Feed size
The particle size of feed has a great influence on the shape of the discharge particle. When the feed size was reduced from 100mm to 50mm, the needle-like content decreased by about 38% in the finished product. So a perfect construction aggregate crushing plant is a number of crusher joint operations, which divided into coarse crushing, intermediate grinding, fine crushing, manufactured sand, and so on.
3. Open and closed loops
In the secondary crushing process, the circulation divides into open circulation and closed circulation. The former is called sieving before crushing, and the latter is called screening after crushing. Sieving before crushing means that the material after the first stage crushing is sieved before entering the second stage crushing inlet for crushing. So the output of the finished material is increased and the needle-like content is also increased. First crushing then screening refers to the first level of broken material all into the second level crusher feed mouth, after re-broken again into the finished screen for screening. The whole system is closed, without crushed material loss. The cycle load is larger, but the product shape is good.
4. Cycling Load
In a closed-loop production process, adjust the discharge port, increase the load in the cycle, the stone particle shape will be better. In the whole process, as the cycle load increases, the wear of the equipment in the crushing system increases.
What is aggregate
Aggregate framework or fill the role of granular loose materials in the concrete. Because it plays the skeleton and the support function in the building, which similar to the human body skeleton. Therefore, it called the aggregate. When cement and water mix, it becomes dilute paste. It will unshape without the aggregate. So the aggregate is a very important building material.
Types of aggregate
The gravel aggregate according to size can be divided into coarse aggregate and fine aggregate. Aggregate that can pass through a 4.75mm screening equipment is called fine aggregate. Without pass through 4.75 mm screen Mesh, Retained granite aggregate as coarse aggregate.
Market demand for aggregate
The market demand for aggregate is huge. China is the world’s largest demand for sand and gravel countries. Accounting for about 45% of the world’s sand aggregate use. China’s annual aggregate consumption of about 18 billion tons. If according to the average price of 50-55 yuan per ton to calculation, the direct output value of more than 900 billion yuan.