How is bottom ash produced?
Bottom ash is created in the environmentally friendly dry furnaces of modern hard coal fired power plants. When the coal is fired, non-combustible mineral residues remain. The greater part of this is fly ash, which is removed from the flue gas by electrostatic precipitators. The heavier residues which fall to the lowest point form the bottom ash.
Environmentally friendly lightweight aggregate
Light, versatile in use and climate-friendly – bottom ash is an easy to use construction material which is used mostly in the production of concrete goods, in horticulture and landscaping, and as filling material in road building. The individual grains have a porous structure that gives them material characteristics similar to other natural and artificial lightweight aggregates. This combines with a high level of environmental compatibility: The use of bottom ash conserves natural resources; moreover, no additional energy is consumed to produce it. On top of that, bottom ash is easily recycled. With interim storage, an average material moisture level of 20 to 25 percent can be attained.