Firing is the concluding ceramic technology process with which the properties of the products, such as water insolubility and compressive strength are defined. The tunnel kiln is the prevalent firing installation. In shuttle kilns, special products and small batches are fired, in fast-firing kilns very much shorter firing times can be realized than in tunnel kilns. For the internal refractory kiln lining and the kiln cars, refractory materials are used. Clay roofing tiles are fired in special refractor setters. With coal-firing systems, solid fuels like lignite, coal fines or coal can be used. Top- or side-fired tunnel kilns are supplied with fuel by means of special burner systems. Suspended ceilings in tunnel kilns are state of the art in refractories engineering.
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