Hole slag, usually waste generated during tunnel excavation, is mainly composed of a mixture of stones, soil and rocks.In recent years, with the continuous development of the field of construction engineering, the reuse of cave slag has become an important means of saving resources and protecting the environment.Among them, it is a common way to use cave slag as a raw material for sand and gravel.So, what kind of hole slag can be used as raw material for sand and gravel?What are the processing equipment for hole slag?
What kind of hole slag can be used as raw material for sand and gravel?
As the raw material of sand and gravel, hole slag needs to have certain physical properties.It mainly includes the following aspects：
- Particle size: The particle size distribution of hole slag needs to meet certain requirements.Generally speaking, finer particle sizes can provide better filling effects and improve the strength and durability of concrete.However, too fine particle size may also lead to increased shrinkage and creep of concrete, so the distribution range of particle size needs to be controlled.
- Strength: The strength of the hole slag needs to meet certain requirements.Generally speaking, hole slag with higher strength can provide better support and improve the carrying capacity of concrete.
- Stability: Hole slag needs to have a certain stability, that is, the ability to keep its physical properties unchanged for a certain period of time.If the stability of the hole slag is poor, it may cause concrete cracking, peeling and other phenomena.
What are the processing equipment for hole slag?
Hole slag processing equipment is equipment used to crush, screen, clean and other treatment of hole slag. Its main purpose is to convert waste hole slag into valuable sand and gravel raw materials for subsequent construction materials.The following describes several common hole slag processing equipment：
- Jaw crusher
Jaw crusher is a classic crushing equipment, the primary crushing equipment in hole slag processing, suitable for crushing materials of various hardness and size.Its main working principle is to use the angle and impact force between the two jaw plates to break the material.Jaw crusher has the advantages of simple structure, easy operation and low maintenance cost.
- Impact crusher
The impact crusher is an efficient and continuous crushing equipment, which is suitable for crushing medium-hardness and brittle materials.Its main working principle is to use the interaction of the impact block and the counterattack plate to break the material.The impact crusher has the advantages of large crushing ratio, uniform product particle size, and large processing capacity. It is one of the advanced equipment in hole slag processing.
- Cone crusher
Cone crusher is a kind of high-efficiency, continuous, multi-stage crushing equipment. The secondary crushing equipment in the processing of hole slag is used to finely crush the hole slag to obtain the required particle size.Its main working principle is to use the rotation and extrusion of one or more cones to break the material.Cone crusher has the advantages of large crushing ratio, fine product particle size, and large processing capacity, but the price is higher and it is suitable for large-scale hole slag processing.
- Vertical impact crusher
Vertical impact crusher is a kind of equipment that uses the dual effects of impact and grinding to crush materials. It is suitable for crushing materials of medium hardness and above.Its main working principle is to use a high-speed rotating rotor to eject the material into the crushing chamber, and after multiple shocks and grinding, the material is broken.Vertical impact crusher has the advantages of large crushing ratio, fine product particle size, and large processing capacity, but it is easy to wear and is suitable for large-scale hole slag processing.
- Vibrating screen: Vibrating screen is mainly used for preliminary screening of hole slag to separate larger particles of hole slag.
- Round vibrating screen: Round vibrating screen is used for fine screening of hole slag, and it can be sieved into sand and gravel of different particle sizes.
- Wheel bucket sand washing machine: The wheel bucket sand washing machine is mainly used to clean the soil and debris in the hole slag to improve the cleanliness of the sand and gravel.
- Sand washing machine: The sand washing machine uses the rotation of the impeller to clean the hole slag and separate the soil and debris.
The above is a brief introduction to the processing of hole slag. The selection of suitable hole slag processing equipment can not only improve the utilization rate of hole slag, but also realize the sustainable use of resources.