MgO optimal distribution method for iron-containing furnace charge of blast furnace

Abstract

The invention relates to an MgO optimal distribution method for iron-containing furnace charge of a blast furnace. The method comprises the following steps: S1, determining that the MgO content SMg' of optimized sintered ore is less than or equal to 1.8% and the binary alkalinity (CaO/SiO2) Sb' is greater than or equal to 1.8; S2, determining that the MgO content of optimized pellets is 1.5%-2.0%and the binary alkalinity is less than or equal to 0.4, namely, PMg' is greater than or equal to 1.5% and less than or equal to 2.0%, Pb' is less than or equal to 0.4, and the charging proportion Pp'is less than or equal to 30%; S3, according to the binary alkalinity requirement Bb of the blast furnace comprehensive furnace charge and the binary alkalinity constraint condition of each iron-containing furnace charge, determining the charging proportion Pp' of the optimized pellets; S4, determining the MgO content PMg' of optimized pellets and the MgO content SMg' of optimized sintered ore according to the MgO content requirement BMg of blast furnace comprehensive furnace charge, the optimized iron-containing furnace charge proportions and the optimized iron-containing furnace charge MgO constraint conditions. The method has the advantages that the reduction degree of the comprehensive furnace charge is effectively improved, the soft melting temperature is reduced, the interval is narrowed, and the smelting performance is improved.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy blast furnace ironmaking charge optimization, and in particular relates to a method for optimizing the distribution of MgO in a blast furnace iron-containing charge. Background technique [0002] In order to achieve a good separation effect of slag and iron in blast furnace smelting, the chemical composition of slag (SiO 2 , CaO, MgO, Al 2 o 3 etc.) have certain requirements. Studies have shown that when the MgO content of the slag is 8% to 12%, and the binary basicity is 1.05 to 1.15, the fluidity and desulfurization performance of the slag are the best. The contents of CaO and MgO in iron ore are relatively low, so it is necessary to add alkaline flux to supplement the MgO and CaO required by the slag. There are three sources of CaO and MgO: (1) sintered ore, (2) pelletized ore, and (3) raw flux; at present, the typical domestic blast furnace charge structure is: more than 7...

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Problems solved by technology

[0004] In view of the problems that the existing blast furnace MgO in my country is all provided by sinter ore, there is a large difference in smelting performance between sinter ore and pellets, and the comprehensive index of ironmaking is poor. The MgO necessary for blast furnace smelting is transferred from sinter to pellets, and at the same time, the basicity of pellets and the ratio of pellets into the furnace are properly adjusted to improve the metallurgical properties of the comprehensive charge and improve the overall efficiency of ironmaking

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