SU1271877A1 - Method of conducting blast furnace heat - Google Patents

Abstract

The invention relates to ferrous metallurgy, in particular to blast furnace production, and can be used to control blast furnace smelting. The aim of the invention is to increase the productivity of a blast furnace and reduce coke consumption by stabilizing the gas permeability of the Melting Zone. A decrease in the proportion of pellets in the charge is carried out taking into account the basicity of the agglomerate according to the following relationship (SV-1) DFeO, where lt is the change in the share of the sinter, in the charge,%; B - basicity of sinter; FeO change in sinter content,%; 3.0 and 1.0 are the limits of variation of the basicity of the agglomerate, in the range of which the method is implemented. When the amount of FeO in the agglomerate is increased by 1%, the fraction in the charge in the mixture is reduced by 2-8% H, on the contrary, which leads to (L stabilization of the melting temperature range of the mixture. 1 Cp f-crystals.

Description

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The invention relates to metallurgy, in particular, to methods of blast furnace smelting. The purpose of the invention is to increase the productivity of the blast furnace and reduce the specific consumption of coke due to the stabilization of the gas permeability of the melting zone. The gas permeability of the charge column in the blast furnace is determined by a number of factors, among which an important role is played by the length of the iron ore materials depending on their temperature range. melting. The temperature range for the melting of the iron ore part of the charge can be estimated by the formula (Tj-m, + t; -t,) - (t;, - ty Ro), gprt T T temperature where 1 S "(I start melting and The melt ing temperature is responsible for the agglomerate and its content of m and so on sinter and pellets in the iron ore portion of the charge, the fraction of units. When the FeO content in the agglomerate decreases, the temperature range of its melting increases, which leads to a decrease in the gas permeability of the melting zone of the charge. gas permeability zone of iron ore mate It is possible due to a decrease in the charge of the pellets melted in a wide temperature range, while the decrease in the proportion of pellets in the charge depends on the basicity of the agglomerate.When the basicity of the agglomerate is 1.0-1.4, the decrease in FeO content in it % requires constant maintenance of the melting temperature range of the charge, reducing the proportion of the mixture in the charge by 2% with a basicity of agglomerates of 2.63, 0, this value is 8%. Thus, the magnitude of the change in the oligate of the pellets in the charge, depending on the agglomerate slaginess, can be calculated by the formula LSo (2B-H) l FeO, the change in the content of the pellets in the charge; basicity of sinter; change in iron oxide content. in the agglomerate, 3.0 and 1.0 are the limits of variation of the basicity of the agglomerate, in the range of which the adjustment is made. The method is carried out in the following manner. When operating the furnace on a mixture of sinter and pellets, the FeO content in the sinter with a basicity of 1.35 decreases from 15 to 12%. To maintain a stable melting temperature range for the charge, the proportion of pellets is. The charge is reduced by 9% due to an increase in the share of agglomerate. The application of the invention stabilizes the temperature range of the charge and gas permeability of the melting zone, which ensures an increase in furnace productivity by .1, 5% and a reduction in the specific coke consumption by 10-12 kg / t of cast iron. invention 1. Method of blast-smelting, including loading sinter and pellets into a blast furnace and melting them to produce cast iron of a given composition, characterized in that, in order to increase the productivity of blast furnace and reduce the specific consumption of coke due to stabilization of the gas permeability of the melting zone, in the charge, it is reduced by 2-8% with a decrease in the FeO content in the agglomerate by 1% and vice versa. 2. The method according to claim 1, characterized in that the decrease in the proportion of pellets in the charge while reducing the content of FeO in the sinter is carried out

3 1271877

taking into account the basicity of PolReO sinter - change in the content of FeO

following dependency: in the agglomerate;

ySho (SG-1,0) -LREO, 3.0

where Amj is the change in the share of the last vi 1.0 - the range of the main charge,%; .5 teas of agglomerate, in the range B, the basicity of the agglomerate, which implements the method.

Claims (3)

^ claims 1. A blast furnace method comprising loading agglomerate and pellets into a blast furnace and melting them 45 to produce cast iron of a given composition, characterized in that, in order to increase the productivity of the blast furnace and reduce the specific consumption of coke by stabilizing 50 the gas permeability of the melting zone, the proportion of pellets in the charge is reduced by 2-8% with a decrease in the FeO content in the agglomerate by 1% and vice versa, 55 2. The method according to π.I, characterized in that the decrease in the proportion of pellets in the mixture with a decrease in the FeO content in the sinter is carried out taking into account the basicity of the sinter according to the following relationship: hw _o = (ЗВ-1,0) - ^ FeO, where Amj is the change in the fraction of pellets in the charge,%; • B - basicity of the agglomerate; ziFeO - change in the content of FeO in the agglomerate; 3.0 and 1.0 are the limits of the change in the basicity of 5 sinter, in the range of which the method is implemented.