Five common crushing methods include:

Hammer Crushing: The material is crushed by force through the impact and impact of a high-speed rotating hammer head or heavy hammer on the material. Common equipment include hammer crushers and jaw crushers. This method is suitable for crushing materials with low hardness, such as limestone, shale, etc.

Compression crushing: The use of mechanical devices to apply pressure to the material, so that the material is crushed under pressure. Common devices include cone crushers, impact crushers and drum crushers. This method is suitable for crushing materials with high hardness, such as quartzite, granite, etc.

Shear Crushing: Using shear force to cut, tear and crush the material. Common equipment include shear crushers and cutting crushers. This method is suitable for fibrous or soft materials, such as wood, paper, etc.

Impact Crushing: The material is impacted and crushed by the high-speed rotor rotating to collide and crush the material. Common equipment include impact crushers and vertical shaft impact crushers. This method is suitable for crushing brittle materials, such as glass, ceramics, etc.

Grinding and stripping crushing: Using the friction and collision between the material and the grinding body, the material is ground into fine particles. Common equipment include ball mill and grinding roller crusher. The method is suitable for crushing and fine grinding of materials with high hardness, such as ores, cement clinker, etc.

Comparison of the crushing effect of different crushing methods

In these five crushing methods, impact crushing effect is the best, grinding and stripping crushing because the force is acting on the surface of the ore, so the effect is the worst, only for fine grained ore, its specific surface area is large, it is more favorable.

In the other three crushing methods, pressure crushing because of the large contact area between the ore and the crushing surface, so the pressure required is also large, the consumption of energy is also more.

Splitting because of the concentration of force on the ore, and fracture in addition to the concentration of force, and the role of bending moment. Therefore, the external force required is smaller, and the energy consumed is also less.

Experiments show that the force required to split and break is only 10% to 20% of the crushing force.

The crushing equipment currently in use often has the combined effect of several forces.

It is worth noting that the general ore is composed of a variety of minerals, their physical properties are not the same, and sometimes very different, when crushing this type of ore, where the minerals are crushed in different situations, some are crushed into coarser particles, some are finer. This phenomenon is called selective crushing.

The fundamental reason for selective crushing is that the mechanical properties of the minerals in the ore differ greatly, but the performance of the powder crushing machinery also has an impact. Such as impact crushers and mills are prone to selective crushing. Note that this phenomenon is important in the beneficiation process. For example: the useful minerals than the vein is easy to mud the ore, should be dissociated first containing more minerals with the particle size, do not have to wait for all the ore are ground to the same size, thus helping to reduce over-crushing.

After understanding the mechanical nature of the ore and the force applied to the crushing equipment, it should be noted that the force applied to the powder crusher should be adapted to the nature of the ore in order to have a good crushing effect.

For hard ore, should be used to bend with the impact to crush it, such as grinding, equipment will be severely worn for brittle ore, bending and splitting more favorable. Such as grinding and peeling, the product will be too much too fine powder. For toughness and viscosity of the larger ore using grinding and peeling to crush it, it is more reasonable. Due to the mechanical properties of the material is a variety of. So the crushing equipment is also a variety of.