This screw conveyor is arranged in an inclining outer tube, where the shaft bearing the screw is hollow and perforated along most of its length for supplying process water during operation, as materials can be conveyed upwards from the lower end of the conveyor to its upper end, and where {HEAD ~ the outer tube} has {TAIL ~ a perforated area} along at least part of its lower side, the perforated area being surrounded by a channel element connected to a line for conducting used process water to a settling tank 
This screw conveyor is arranged in an inclining outer tube , where the shaft bearing the screw is hollow and perforated along most of its length for supplying process water during operation , as materials can be conveyed upwards from the lower end of the conveyor to its upper end , and where { HEAD ~ the outer tube } has { TAIL ~ a perforated area } along at least part of its lower side , the perforated area being surrounded by a channel element connected to a line for conducting used process water to a settling tank
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