26th April 2023 (6 Topics)
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In a first, fly ash particles found in Antarctic ice
Context
Spheroidal carbonaceous particles (SCP), a component of fly ash, have been identified for the first time in an Antarctic ice core, according to a new study.
What is fly ash?
- Fly ash is a residue generated in combustion and comprises the fine particles that rise with the flue gases.
- Fly ash is a heterogeneous material. The main chemical components present in fly ash are:
- Silicon dioxide
- Aluminium oxide
- Ferric oxide
- Calcium oxide (occasionally)
- Source: Coal-fired power plants are the biggest sources of fly ash, which contains toxic chemicals such as arsenic, barium, cadmium, nickel and lead, among others.
- Impact: Without proper management, fly ash can pollute the waterways, groundwater, drinking water, and air, posing a risk to humans, wildlife, and the environment.
What are the applications?
- In the commercial and industrial sectors, fly ash has a wide variety of applications and uses, though it is primarily known for improving the durability and workability of concrete mixes.
- Fly ash is also a filler in paints, adhesives, and metal and plastic composites.
- It's commonly used as structural fill for road construction and fly ash can be used to make bricks, ceramic tiles, plaster, Portland cement, and ready-mix cement.
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