Non-ferrous slags are different from steel slag high content of iron oxide (20-40%). Fuel slag (Zoloshlaki CHP) Zoloshlaki formed during fuel combustion at the CHP are widely used in the production of building materials. In this regard, we could not ignore this product. When burning solid fuel from its formed part of the mineral ash and slag, whose content is different for different fuels. They constitute 10-15% of brown coal, in the bituminous coals – 3-40%, anthracite – 2-30% oil shale – 50-80% fuel peat – 2-30%, wood – 0,5-1, 5% fuel oil – 0.15-0.2%. In Currently, the majority of CHP fuel is burned in pulverized state, the temperature in the combustion chamber reaches 1200 – 1600 C.
In this conglomerate of various compounds formed from the mineral part of it, stand in a dust mass. Small and light particles (size from 5 to 100 microns) contained in the ashes of up to 80-85%, are carried away from the furnace flue gas conglomerate, forming the so-called ash-entrainment. Larger particles are deposited on / under furnace slag lump of fused or vitreous mass, which is then subjected to granulation. The ratio of generated slag and ash-carryover is different, it depends on the design of the furnace at the CHP and power plant. For example, in furnaces with solid slag removal in the slag usually goes 10-20% of the fuel ash. In furnaces with liquid slag removal of slag becomes 20-40%, while in cyclone furnaces – to 85 – 90% of the fuel ash.