What is fly ash?

Fly ash is the fine ash that is produced as a byproduct from the combustion of coal in power plants, and it is collected from the exhaust of incinerators. It consists primarily of small particles that rise with combustion gases. These particles are captured by pollution control equipment before they can be released into the atmosphere, making it an important aspect of waste management in energy production.

The composition of fly ash typically includes alumino-silicate glass, unburned carbon, and various metals, depending on the type of coal burned. It is commonly used in construction materials, such as concrete, due to its pozzolanic properties, which allow it to enhance strength and durability.

Other options presented do not accurately describe fly ash: waste in landfills refers to materials discarded after use, harmful gases during combustion suggest pollutants like carbon monoxide, and naturally occurring fires would produce ash but not the specific fly ash associated with industrial processes. Understanding the characteristics and uses of fly ash is crucial for those in environmental management and sanitation practices.