Facility 6, wherein for processing {HEAD ~ 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 {TAIL ~ a washing drum inlet opening} at one end of the washing drum to an outlet opening at an opposite end of the washing drum 
Facility 6 , wherein for processing { HEAD ~ 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 { TAIL ~ a washing drum inlet opening } at one end of the washing drum to an outlet opening at an opposite end of the washing drum
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