What is the use of crushing coal gangue?
Coal gangue is a solid waste generated during coal mining and washing and has long been considered an environmental burden. However, with the advancement of technology and the improvement of environmental awareness, the reuse value of coal gangue is gradually being explored. Crushing is a key step in the utilization of coal gangue resources. This article will introduce in detail the uses of coal gangue after crushing, and attach relevant data.
1. Main uses of coal gangue crushing
After crushing, coal gangue can be used in many fields according to its composition and particle size. The following is a summary of the main uses:
| Purpose | Particle size requirements after crushing | Application scenarios |
|---|---|---|
| Building materials production | 0-10mm | Brick making, cement admixtures, lightweight aggregates |
| road filling | 10-30mm | Roadbed materials, pavement base |
| fuel for power generation | 0-5mm | Circulating fluidized bed boiler blending |
| soil improvement | 0-5mm | Improvement and reclamation of barren land |
| Chemical raw materials | 0-1mm | Extract aluminum, silicon and other elements |
2. Technical parameters of coal gangue crushing
Different uses have different requirements for the process and equipment of coal gangue crushing. The following is a performance comparison of common crushing equipment:
| Device type | Feed particle size (mm) | Discharge particle size (mm) | Processing capacity (t/h) | Applicable scenarios |
|---|---|---|---|---|
| jaw crusher | ≤1200 | 10-350 | 1-2200 | coarsely chopped |
| impact crusher | ≤800 | 0-30 | 30-800 | medium finely chopped |
| cone crusher | ≤560 | 3-60 | 12-1000 | medium finely chopped |
| Roller Crusher | 2-10 | 5-110 | finely chopped |
3. Analysis of economic benefits of coal gangue crushing
Taking a coal gangue treatment project with an annual output of 1 million tons as an example, the utilization of resources after crushing can produce significant benefits:
| Utilization method | Unit income (yuan/ton) | Annual income (10,000 yuan) | Investment payback period (years) |
|---|---|---|---|
| brick making | 30-50 | 3000-5000 | 2-3 |
| generate electricity | 15-25 | 1500-2500 | 4-5 |
| road filling | 10-20 | 1000-2000 | 1-2 |
| Chemical extraction | 80-120 | 8000-12000 | 5-8 |
4. Environmental significance of coal gangue crushing
The crushing and reuse of coal gangue not only creates economic value, but also has important environmental benefits:
1.Reduce land occupation: Every time 100 million tons of coal gangue is used, 500 acres of land can be saved;
2.Reduce contamination risk: Recycling after crushing can avoid spontaneous combustion and leachate pollution;
3.Alternative natural resources: Used in the production of building materials to reduce clay mining and sand and gravel consumption;
4.Carbon emission reduction benefits: Each ton of coal gangue bricks can reduce CO₂ emissions by 0.28 tons compared to clay bricks.
5. Policy support and development trends
The "Implementation Plan for Comprehensive Utilization of Bulk Solid Waste" issued by the National Development and Reform Commission in 2023 clearly states:
1. By 2025, the comprehensive utilization rate of coal gangue will reach more than 75%;
2. Provide tax incentives and equipment subsidies to coal gangue utilization companies;
3. It is prohibited to build new permanent coal gangue dumping sites;
4. Support the construction of more than 10 demonstration bases for high-value utilization of coal gangue.
Conclusion
Coal gangue crushing is a key link in realizing "turning waste into treasure". Through scientific crushing, processing and classification utilization, it can not only create considerable economic value, but also significantly improve the ecological environment of the mining area. With the advancement of technology and the increase of policy support, the utilization of coal gangue resources will usher in a broader development space.
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