SU699027A2 - Method of producijg fluxed raw material - Google Patents

Description

This invention relates to the preparation of metal raw materials for blast smelting. From the main auth. St. No. 296442 is a known method for the production of fluxed raw materials, including the use of a mixture of lime-iron-containing materials in an amount of up to 50% by weight of the charge, and the content of CaO in the mixture is no more than 20%. However, with this method, the lime-iron-containing mixture due to the low mixing efficiency of the mixture has insufficient contact with the carbon of the fuel. This does not allow to fully use the intensifying effect of the injected mixture on the process of formation of the liquid phase during sintering of the agglomerate. The purpose of the invention is to increase plant productivity and improve sinter quality. This is achieved by the fact that in a known method of producing fluxed raw material, carbon-containing material is introduced into the mixture used as a component of the charge in the amount of 10-20% of the total carbon content in the mixture. The presence of carbon fuel in a mixture of lime-iron-containing material contributes to the intensive reduction of high iron oxides to nitrous in the zone of solid-phase sintering at a temperature of 900-1100 С and the formation of low-melting eutectics in the CaO - FeO FejOj system. The proposed method is carried out as follows. From the total flow of materials, a part of iron-containing material is released, to which lime-containing material, material (for example, lime from kiln machines) and solid fuel in the amount of 10–20% of the total consumption to the charge, is metered. The mixture prepared in this way is subjected to crushing, followed by its introduction into the total flow of the mixture before mixing. As carbon fuel can be used unburned fuel, which

when implementing this method, it is introduced in excess during calcination of limestone on roasting machines. The optimum content of fuel used to enter the mixture in the mixture is selected experimentally, depending on the composition of the materials used to produce the sinter.

Example, Experimenting the sintering of sintering shafts was carried out without using co-milled lime-containing mixtures, using Tekhniko “economic speckles

calling for mixtures according to the basic invention and as proposed. In order to determine the amount of carbon introduced into the composition of the mixture, sintering was carried out with a solid fuel content in the mixture of 5, 10, 15, 20, 25% of its total content in the mixture.

Technique. “At horseback, the specs of agglomeration mixtures are given in the table. agglomerative sheikht