Manganese-based fluxing agent for converter steelmaking and preparation method thereof

Abstract

The invention provides a manganese-based fluxing agent for converter steelmaking. The manganese-based fluxing agent comprises the following components of 60-75 percent of manganese oxide, 10-20 percent of calcium oxide, 5-10 percent of silicon dioxide, 3-5 percent of ferrous oxide and 3-5 percent of aluminum oxide, wherein the total manganese content accounts for 40-55 percent of the manganese oxide. The preparation method of the fluxing agent comprises the following steps: the manganese ore fines, the lime powder and the reducing agent are prepared according to the composition of the fluxing agent, the prepared materials are evenly mixed and then burnt with a continuous strand sinter machine, the thickness of the fabric is 300-500 mm in the burning process, the temperature is controlled between 1300 DEG C and 1500 DEG C, and then the materials are cooled, crushed and processed after burning. The manganese-based fluxing agent is favorable for environmental protection, has good continuous slag melting effect, no metal spattering and small lining erosion, can increase the content of useful elements in the molten steel, reduces the smelting cost and improves the quality of the molten steel.

Description

technical field [0001] The invention belongs to the technical field of steelmaking, and in particular relates to a manganese-based flux technology for converter steelmaking. Background technique [0002] In the process of converter steelmaking, in order to ensure the early slag generation and smooth operation of dephosphorization, desulfurization and blowing, it is necessary to add a certain amount of flux. At present, the fluxes used in production mainly include the following types: [0003] 1. With CaF 2 Main composition: fluorite is a commonly used slagging flux, the main component of fluorite is CaF 2 , which has a low melting point and can significantly reduce the melting point of CaO, but because fluorite releases harmful (F -1 ) elements, causing environmental pollution, and at the same time, fluorite seriously erodes the converter lining, so the use of fluorite as a flux has been banned. [0004] 2. Take Al 2 o 3 Be the vanadium class (bauxite, bauxite and bauxi...

AI Technical Summary

Problems solved by technology

[0003] 1. With CaF 2 Main composition: fluorite is a commonly used slagging flux, the main component of fluorite is CaF 2 , which has a low melting point and can significantly reduce the melting point of CaO, but because fluorite releases harmful (F -1 ) elements, causing environmental pollution. At the same time, fluorite has seriously eroded the lining of the converter. Therefore, the use of fluorite as a flux has been banned.

[0004] 2. Take Al 2 o 3 Be the vanadium class (bauxite, bauxite and bauxite as main raw material) flux of main composition: the Chinese patent that the patent No. is 99113322.6 discloses a kind of with Al 2 o 3 It is mainly composed of bauxite flux, and its composition is: Al 2 o 3 ≥45%, SiO 2 ≤30%, Fe 2 o 3 : 7~8%, the balance is CaO, MgO, TiO 2 , P, S and other impurities, the particle size is 5-30mm, and the usage rate is 1.6-9kg / ton. The slag removal effect of the vanadium-based flux is relatively stable, but there are problems such as serious erosion of the furnace lining and insignificant slag removal effect.

[0005] 3. Iron-phosphorous (iron scale, iron ore and iron scale) fluxes mainly composed of FeO: Chinese patent No. 99112573.8 discloses a kind of iron-phosphorus flux mainly composed of FeO Flux, its composition is: iron scale 70-90%, iron-making sludge 5-25%, binder 1-5%, raw materials are pulverized, prepared, mixed and pressed into balls, iron scale flux slag The effect is more significant, but there are problems such as severe corrosion of the furnace lining, large temperature drop of molten steel, short fluxing time and unsustainable slag removal, etc.

[0006] The common problems of the above-mentioned fluxes are that they seriously corrode the furnace lining, some of them also pollute the environment, or the effect of slag removal is not obvious, or the temperature drop of molten steel is large, the fluxing time is short, and the slag cannot be continuously removed, etc.

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