Facility 6, wherein for processing light materials treated in the first chamber and the second chamber, there is provided a washing drum which is disposed largely horizontally, and which is provided with a helical conveying and washing means with radial wing blades for stirring and mechanically treating the materials in a water bath during the conveying of materials from a washing drum inlet opening at one end of the washing drum to {HEAD ~ an outlet opening} at {TAIL ~ an opposite end} of the washing drum 
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Facility 6 , wherein for processing light materials treated in the first chamber and the second chamber , there is provided a washing drum which is disposed largely horizontally , and which is provided with a helical conveying and washing means with radial wing blades for stirring and mechanically treating the materials in a water bath during the conveying of materials from a washing drum inlet opening at one end of the washing drum to { HEAD ~ an outlet opening } at { TAIL ~ an opposite end } of the washing drum
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