The green development of the gravel aggregate industry has always attracted the attention of industry insiders. Some studies have shown that gravel aggregate has become the second largest consumable for humans, second only to fresh water, high-speed railways all over the country, roads extending in all directions, and tall buildings lined up one after another. Building, what kind of engineering construction does not need to consume a lot of gravel aggregate? So what exactly is aggregate?
What exactly is aggregate?
Aggregate plays the role of filling and racking in concrete, which is loosely granular and improves the durability and stability of concrete.
According to the source, it is divided into natural, artificial and regenerated;
According to the particle size, it can be divided into coarse aggregate and fine aggregate;
According to the density, it is divided into ordinary aggregate and light aggregate.
Fine aggregates with a particle size between 0.15-4.75mm are commonly known as sand, and coarse aggregates with a particle size between 4.75-9.0mm are commonly known as stone. Since natural sand and stone aggregates are gradually depleting, the artificial sand and stone markets are compared Fiery, can process all kinds of slag, rock, waste, etc. to the required particle size through mechanical equipment.
Aggregate production process
The selection of aggregate production line is an important part of modern aggregate production. The complete production line consists of four major systems: feeding system, crushing sand system, screening system, and sorting system.
This stage mainly uses hammering to pre-crush the bulk materials in the raw aggregate of sand and gravel aggregates, and sort the debris that are not suitable for crushing, to remove waste wood, plastic and other debris, so as to facilitate the next The processing process. And conduct the first magnetic separation to remove the scrap iron in the aggregate.
2. Crushing sand
First, the jaw crusher is used to crush the raw materials in one stage, and the feed is evenly fed by the vibrating feeder. The jaw crusher uses the movement of the jaw plate to crush the large aggregates of sand and gravel into smaller particles. The rough material is transported by the conveying equipment to the transfer pile. Then, the sand making and shaping machine can be used to finely crush and shape the materials, and the aggregate size of the gravel after the sand making machine is processed is uniform.
3. the first screening
At this stage, a round vibrating screen is used to divide the coarse-grained concrete aggregate screen into blocks of 0-40mm and crushed materials below 5mm. Among them, the coarse aggregate of 5-40mm can be directly used for the production of C15-C20 concrete. Fine aggregate can be transported to the transfer pile for the next process.
4. Secondary crushing and screening
For the second crushing, a ball mill can be used to crush the fine aggregate again. The second-level screening divides the crushed aggregate into 5-20mm high-quality recycled aggregate, which can be used for C25-C30 concrete manufacturing. The third-level screening selects 0.15mm-5mm high-quality recycled fine aggregate and 0.15 Fine powder below mm.
Common aggregate production line configuration
Generally speaking, the configuration of the aggregate production line needs to be combined with the user's working conditions, time production, finished product particle size, energy consumption and other requirements. The common equipment combination form of the aggregate production line:
1. Jaw crusher + cone crusher + sand making machine + auxiliary equipment (feeder, conveyor, elevator, etc.);
2. Jaw crusher + impact crusher + sand making machine + auxiliary equipment;
3. Hammer crusher + high efficiency fine crusher + impact sand making machine + auxiliary equipment.
The advantages of finished aggregate processed by the aggregate production line:
1. It has a very good particle gradation and a small accumulation void ratio, which can save the amount of cement.
2. It has very stable physical and chemical properties and better durability.
3. Less impurities, will not affect the cement hardening, can effectively increase the service life of engineering buildings.
4. The mechanically processed aggregate has a higher hardness and firmness, and has a more obvious role as a rack.
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