Bricks are fired in kilns, typically for a period of 10 to 40 hours, using various fuels to achieve the necessary high temperatures for hardening.
Kiln Types and Firing Process
The firing process is crucial for transforming raw clay into durable bricks. The specific method depends on the type of kiln used and the fuel source.
Common Kiln Types:
- Tunnel Kilns: These are the most common type. Bricks move continuously through the kiln on carts.
- Periodic Kilns: These kilns are loaded with bricks, fired, cooled, and then unloaded in batches.
Fuel Sources:
A variety of fuels can be used to fire bricks:
- Natural gas
- Coal
- Sawdust
- Methane gas from landfills
- Combinations of these fuels
Firing Duration:
The firing time typically ranges from 10 to 40 hours, depending on the kiln type and other factors influencing the process. This timing ensures the clay vitrifies properly, resulting in strong and durable bricks.
