METHOD OF PROCESSING IRON-CONTAINING DUST Russian patent published in 2025 - IPC B03B7/00 

FIELD: performing operations.

SUBSTANCE: proposed invention relates to methods of processing of dust separation products, which occur at various processing processes of iron-containing materials, for example, slags, scale and sawdust. Proposed method comprises preliminary coarse cleaning and magnetic-gravitational concentration. Coarse-grained and fine-grained products are obtained during preliminary coarse purification. Coarse-grained products are subjected to dry magnetic separation at induction from 0.1 to 0.3 T so that magnetic and non-magnetic products are obtained. Magnetic product is supplied for further processing, and non-magnetic product is sent to dump. Fine-grained products are subjected to wet cleaning so that iron-containing pulp is obtained, which is subject to magnetic-gravitational centrifugal concentration, with preliminary magnetisation at magnetic field induction from 0.15 to 0.4 T. Non-magnetic product of magnetic-gravitational centrifugal concentration is directed to dump, magnetic product is thickened with simultaneous addition of PVA in amount of 1.0 to 2.5% of solid weight. Thickened product is filtered to obtain a cake and a filtrate. Cake is mixed with coarse-grained magnetic product of dry magnetic separation and directed to extruder to produce wet iron-containing extrudates which are dried; dry iron-containing extrudates are finished product. Thickening discharge and the filtrate are used as recycled water.

EFFECT: high efficiency of extracting iron and low environmental hazard.

1 cl, 1 dwg, 6 tbl, 2 ex