Recycling process of coarse sludge from steelworks or industrial or metallurgical tailings by gravimetric concentration of metallic iron or iron oxides in concentrating spirals

摘要

"RECYCLING PROCESS OF THICK WOOD OR INDUSTRIAL OR METALLURAL WASTE THROUGH GRAVIMETRIC IRON CONCENTRATION OR IRON OXIDE IN CONCENTRATIVE SPIRALS". The present invention comprises a process for recycling coarse sludge from steelmaking or industrial and metallurgical tailings by gravimetric concentration of metal or iron oxides in concentrating spirals. (2), carried out by belt conveyors (3), equipped with a frequency inverter, to control the feed, and a load cell, to weigh all sludge to be fed in the gravimetric concentration plant, to a lung silo (4). ). Alternatively, sludge can be collected in Brook buckets (5) by reversing the rotation of belt conveyors (3). In the process of gravimetric concentration by spirals, three partitions are produced: one concentrate, one mixed and one tail, primary. The mixed is discharged into the pulp box (10) and pumped into a second set of coils (11), producing two secondary material partitions, a concentrate and a tailings. The primary and secondary tailings are gravity transferred to the pulp box (12), and then pumped to the thickeners (13). This concentration can, in a second alternative, be performed through cycloning (14) and filter press (15), aiming to maximize the percentage of solids. And in the second feeding alternative, via the Brook bucket (5), the sludge is extracted and transported by truck to the proximity of the gravimetric concentration plant, where it is dumped on a silo (20) and by a conveyor. thread (21) feeds the vibrating screen (22). This process results in a metallic iron concentrate that can be reused in the steel industry, in the production of steel and other metallurgical products.