Coal gangue is a kind of solid waste produced during coal mining. Its main components are silicate, aluminosilicate and other minerals.The large accumulation of coal gangue not only occupies land resources, but also causes serious pollution to the environment.Therefore, the effective treatment and utilization of coal gangue has become an important task in the comprehensive utilization of resources and environmental protection in our country.Coal gangue crushing is the first step in the treatment and utilization of coal gangue. This article will discuss the equipment selection, process flow and use of coal gangue crushing.
What equipment is used for coal gangue crushing?
Coal gangue crushing equipment mainly includes jaw crushers, cone crushers, impact crushers, etc.When choosing crushing equipment, the following factors should be considered：
- The physical properties of coal gangue: including the hardness, humidity, particle size, etc. of coal gangue, different types of crushing equipment should be selected for coal gangue of different properties.
- Production capacity: Select the appropriate production capacity of the crushing equipment according to the production needs.
- Crushing method: Coal gangue crushing can be divided into dry crushing and wet crushing, and the appropriate crushing method is selected according to the actual situation.
- Equipment performance: Choose crushing equipment with stable performance, easy maintenance, energy saving and environmental protection.
Coal gangue crushing process flow
The coal gangue crushing process mainly includes the following steps：
- Raw material preparation: The coal gangue raw materials are sieved to remove raw materials larger than the specified particle size for subsequent crushing.
- Crushing: The prepared coal gangue raw materials are fed into the crusher for crushing, and the crusher screen is adjusted according to demand to control the particle size of the coal gangue after crushing.
- Screening: The broken coal gangue is sieved through a vibrating screen and divided into different particle size grades.
- Collection and transportation: The sieved coal gangue is collected and sent to the next processing or utilization link through the conveying equipment.
Use of coal gangue after crushing
After coal gangue is broken, it can be used in the following aspects according to its particle size and properties：
- Coal gangue brick: The broken coal gangue is mixed with cement, lime and other materials to make coal gangue brick, which is used in the construction field.
- Coal gangue aggregate: The broken coal gangue is processed into aggregates of appropriate particle size for infrastructure construction such as roads and bridges.
- Coal gangue for power generation: The broken coal gangue is used as fuel for power generation in thermal power plants.
- Coal gangue fertilizer: The broken coal gangue is activated to make organic-inorganic compound fertilizer for agricultural production.
- Environmentally friendly materials for coal gangue: The broken coal gangue is used to prepare environmentally friendly materials, such as soil improvers, heavy metal adsorbents, etc.
Coal gangue crushing is a key link in the comprehensive utilization of coal gangue. Selecting suitable crushing equipment and optimizing the crushing process can improve the comprehensive utilization rate of coal gangue, reduce environmental pollution, and realize resource-based and harmless treatment.