FIELD: metallurgy.
SUBSTANCE: group of inventions relates to the pyrometallurgical conversion of lignite ores, in particular to a method and device for producing iron from lignite ore oolites. The method involves heating them by passing an electric current and compacting them. Oolites are charred in a small oolite charring machine, after which they are poured into a small press mold of quasi-spherical geometry and an electric current is passed to create a temperature of 250-400 ºC at the points of contact of the oolites. Then, oolites are compacted by pressing to form small spherical oolite-carbon molds with an average diameter of 15-25 mm. The resulting molds are charred in a large charring machine of small spherical oolite-carbon molds. Then, an electric current is passed through the bulk mass of the resulting charred small spherical oolite-carbon molds, which ensures a temperature of 800-900 ºC at the points of contact of the spherical molds. The molds are pressed to produce large spherical oolite-carbon molds with an average diameter of 150-250 mm, which are hammered at a temperature of 900-1100 ºC to produce bloom. Bloom is used to prepare homogeneous metal molds by pressing and rolling at a temperature of 960-1200 ºC. Then they are melted in a vertical induction furnace at a temperature of 1240-1540 ºC to produce iron and separate the rerolling product.
EFFECT: inventions make it possible to efficiently compact, enrich and recover iron ore material.
6 cl, 17 dwg
