A mgo optimal allocation method for blast furnace iron-containing charge

Abstract

The invention relates to a method for optimizing the distribution of MgO in blast furnace iron-containing charge, comprising the following steps: S1: determining the optimized sintered ore MgO content S Mg ’≤1.8%, binary alkalinity (CaO / SiO 2 )S b ’≥1.8; S2 determines that the optimized pellet MgO content is 1.5%‑2.0%, binary alkalinity≤0.4, that is, 1.5%≤P Mg '≤2.0%, P b ’ ≤ 0.4, the ratio of entering the furnace P p ’≤30%; S3: According to the binary basicity requirements of blast furnace comprehensive charge B b , and the binary alkalinity constraints of each iron-containing charge, determine the optimized proportion of pellets into the furnace P p ’; S4: According to the MgO content requirements of blast furnace comprehensive charge B Mg , the optimized ratio of each iron-containing charge, and the MgO constraint conditions of each iron-containing charge, determine the optimized pellet MgO content P Mg ’ and sinter MgO content S Mg '. The advantages are: the reduction degree of the comprehensive charge is effectively increased, the reflow temperature is lowered, 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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