What are the uses of coal gangue?

1. Recovery of coal and pyrite: Good coal is washed from coal gangue by simple process, poor coal is selected from coal gangue by screening, and pyrite is also selected. Or recover pyrite, cleaned coal and middle coal from jigger shaking table coal preparation process. Recovered coal can be used as fuel for power boilers, gangue washing can be used as building materials, and pyrite can be used as chemical raw materials.

2. Used for power generation: mainly using mixed combustion of coal washing and gangue washing to generate power. China has used a fluidized bed furnace to burn a mixture of washed coal and gangue (calorific value is about 2000 kcal per kilogram) to generate electricity. Slag can produce slag brick and slag cement.

3. Manufacturing building materials: You can dig less fertile land without using clay as raw material for brick making. When burning bricks, coal can be saved by using combustible substances of coal gangue itself.

4. Coal gangue can also be used for producing low calorific value gas, making ceramics, making soil improvers, or paving roads, underground filling and land reclamation. After spontaneous combustion, the gangue hill can also plant grass to beautify the environment.