
Today, electricity is a vital part of functioning as a society. Thermal power plant produces electricity and furthermore it produces secondary products in the form of different types of ash. The difference between a secondary product and waste is that the secondary product is generally both usable and not dangerous to people and the environment. Important however, is that technical and environmental properties of the secondary products are evaluated to the specific application. In many cases it saves a lot of energy, a lot of money and solution to environmental pollution problems, to use a recycled material instead of conventional ones.