| 摘要 |
<p>The subject of the invention consists of a device for washing metal-containing sludges, said device comprising a screw feeder cylinder bearing blades placed between the turns and rotatably supported in both senses on its horizontal axis within a fixed cylinder containing a washing fluid, said fluid being circulated between the inside of the screw feeder cylinder and the gap between the same and the fixed cylinder. The exhausted washing fluid is removed and is replaced within the fixed cylinder by fresh washing fluid, according to the adjustment of a level control. Said screw feeder cylinder is caused to rotate in both senses so as to cause the sludge to be washed to go forward and backward so meeting the washing fluid inside the cylinder itseld according to a predetermined washing program, and after such program has been realized, the sludge now washed is removed after filtering. Are also subjects of this invention a process for washing metal-containing sludges which makes use of such kind of device, and a product which is suitable to counteract the excess acidity of woodlands, said product being made up of the residual sludge of such process. <IMAGE></p> |
