A method for cleaning and / or descaling of a slab or a washer and scale washer by means of a preliminary

摘要

The invention relates to a method for cleaning and / or descaling of a slab or of a preliminary (1) by means of a washer (2), wherein the scale washer (2) at least one nozzle (3) by means of which under pressure (p) standing water to the surface of the slab or of the preliminary (1) is applied. In an energy-saving manner in order to achieve a good descaling result, the invention provides that, according to the outlet (4) of the nozzle (3) in the direction normal (n) to the surface of the slab or of the preliminary (1), rectangular or in the form of slots with at least in sections, arcuate configuration, is formed, so that the water over the entire width (b) of the slab or of the preliminary (1) as a continuous strip-shaped beam (5), wherein the width (b) of the outlet (4) of the nozzle (3) in the conveying direction (f) of the slab or of the preliminary (1) between 0.2 mm and 1.5 mm is chosen, wherein the water of the nozzle (3) with a pressure of between 5 bar and 50 bars is supplied, and wherein the distance (a) between the point of exit (4) of the nozzle (3) and the surface of the slab or of the preliminary (1) of between 8 mm and 35 mm is selected. Furthermore, the invention relates to a scale washer.