As a carbonate rock with calcite as its main component, limestone is also called limestone. It has various colors, including gray, grayish white, grayish black, yellow, light red and brownish red, and is usually of low hardness. It may be mixed with minerals such as dolomite, clay and debris.
Limestone machine-made sand is made from waste materials, waste slag and stone powder from limestone mining through mechanical crushing, water washing and screening processes. This processing method gives limestone machine-made sand the following advantages:
1. It can meet national standards and engineering quality requirements, and accurately control technical indicators such as the particle size of machine-made sand.
2. The particle shape of machine-made sand is mostly angular and the surface is rough, which helps to improve the adhesion with cementitious materials such as cement, thereby enhancing the strength of concrete.
3. The production of machine-made sand can be combined with the production process of crushed stone to promote the comprehensive use of mineral resources.
The production process of machine-made sand and stone is mainly divided into two-stage crushing and three-stage crushing. Small production lines usually use two-stage crushing and screening, while large production lines usually choose three-stage crushing and screening due to the large size of the material.
In the production of limestone machine-made sand, three-stage crushing (coarse crushing, medium and fine crushing, sand making) is a common method:
Coarse crushing generally uses a jaw crusher.
Medium crushing often uses an impact crusher.
For fine crushing and sand making, vertical shaft or cone crushers are usually used.
The following are the characteristics of these equipment:
1. Jaw Crusher
It is favored for its simple structure, stable continuous operation and low cost. It can adjust the discharge port and has low requirements for plant height. When handling wet materials and high clay content ores, it is not easy to clog and is widely used in the coarse crushing stage of domestic sand and gravel aggregate projects.
2. Impact Crusher
This equipment is known for its large crushing ratio and low energy consumption, and is particularly suitable for the handling of fragile materials. Its product particle size distribution is more uniform, and it is often used for mid-stage crushing in sand and gravel aggregate projects.
3. Vertical Shaft Impact Crusher
This model has a small size, simple foundation, high crushing efficiency, large output and low maintenance requirements. The various chamber types of vertical shaft crushers are suitable for different working conditions. They are suitable for fine and ultra-fine crushing of most materials, and have the functions of shaping and sand making.
The "stone-on-stone" crushing method is suitable for materials with high abrasiveness and medium-hardness or above, such as basalt. In this method, the impact between materials reduces the wear on the metal components of the equipment, reduces iron consumption, reduces maintenance requirements, and the finished product has excellent particle shape.
The "stone-on-iron" crushing method is suitable for materials with low abrasiveness and medium-hardness or below, such as limestone, and has a high crushing efficiency.
The above are the main crushing equipment commonly used in the production of limestone machine-made sand and gravel aggregates. As for the specific equipment configuration of the sand and gravel production line, it should be selected according to the specific situation. Hongji Group is committed to understanding customer needs and providing customers with the best production line design solutions to ensure that customers can produce without worries.
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