Flyash | Frequently Asked Questions


What is fly ash?


Fly ash is a fused residue of clay minerals present in coal. The high temperature generated when coal burns in thermal power plants, transforms the clay minerals in coal powder into a variety of fused fine particles of mainly aluminium silicate composition.


Is fly ash harmful?

Fly ash is a very fine powder and tends to travel in the air. When not properly disposed of, it pollutes air and water, and causes respiratory problems

when inhaled. When it settles on leaves and crops in agriculture fields around the power plant, it lowers the yield.


What makes fly ash useful?

Fly ash is most commonly used as a pozzolan in PCC applications. Pozzolans are siliceous or siliceous and aluminous material, which in a finely divided form and in the presence of water, react with calcium hydroxide at ordinary temperatures to produce cementitious compounds.

What are Carbon credits?


Carbon credits are certificates awarded to countries that are successful in reducing the emissions that cause global warming. For trading purposes, one credit is considered equivalent to one tonne of carbon dioxide emission reduced. Such a credit can be sold in the international market at a prevailing market rate. The trading can take place in open market. Developed countries that have exceeded the levels can either cut down emissions, or borrow or buy carbon credits from developing countries. However there are two exchanges for Carbon credit viz Chicago Climate Exchange and the European Climate Exchange.