Rotary drum washer for street sweeping waste and contaminated soil

摘要

A horizontal rotary drum in which the materials to be treated are introduced through a feed hopper together with a water flow admitted through treatment nozzles so as to form a suspension of water and materials is described. The horizontal rotary drum has inclined paddles that move forward the heavy materials deposited on the bottom of the drum towards an exit end where an extractor conveys them towards concentric screening means, a stop ring being arranged transversally inside the drum so as to leave only a peripheral annular passage having a height lower than the level of the suspension of water and materials present on the bottom of the drum so as to stop the lighter organic contaminants that are in the upper part of the suspension. Means for slightly inclining the axis of the rotary drum within a small angular interval, as well as with clod-breaking teeth for treating clayey materials are also described.

主权项

1. A washer comprising:
a horizontal rotary drum in which materials to be treated are adapted to be introduced through a feed hopper together with a water flow admitted through treatment nozzles so as to form a suspension of water and materials, inclined paddles arranged inside the drum, the inclined paddles configured to move forward heavy materials deposited on the bottom of the drum towards an exit end of the drum, an extractor and concentric screening means, the extractor connected to the drum at the exit end and configured to convey the heavy materials towards the concentric screening means, a first nozzle for admission of water for counter-current washing of the treated materials arranged just upstream of said extractor, and a stop member arranged transversally inside the drum so as to leave only a peripheral annular passage having a height lower than the level of the suspension of water and materials present on the bottom of the drum.