Preparation method for carbon extracting and manganese retaining of high-manganese high-silicon and high-phosphorus molten iron through converter smelting

A converter smelting and molten iron technology, which is applied in the direction of manufacturing converters and improving process efficiency, can solve the problems of no relevant research reports on the smelting process of carbon extraction and manganese preservation, so as to promote the improvement of smelting technical and economic indicators, reduce the amount of addition, Improve the effect of dispensing concentration

Active Publication Date: 2018-12-21
WUKUN STEEL
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AI Technical Summary

Problems solved by technology

At present, domestic steel mills basically use low-Mn and low-P molten iron with the following chemical composition (Mn≤0.50wt%, Si 0.30-0.50wt%, P≤0.100wt%). The converter smelting process for the above-mentioned molte...

Method used

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preparation example Construction

[0016] The preparation method of converter smelting high-manganese, high-silicon, high-phosphorus hot metal to extract carbon and preserve manganese in the present invention comprises the following process steps:

[0017] A. Smelting and loading process: pour out all the final slag in the converter after tapping the steel in the upper furnace and splashing the slag, according to 130-150kg / t 钢 The scrap steel is put into the ratio, and the scrap steel is added to the 50-ton LD converter; according to 920-940kg / t 钢 The proportion of molten iron is loaded, and the following temperature and mass ratio of high-manganese, high-silicon and high-phosphorus molten iron are added to a 50-ton LD converter: molten iron temperature ≥ 1290 ° C, molten iron composition C 4.5-5.2wt%, Si0.70-1.00wt%, Mn 1.10-1.50wt%, P 0.120-0.170wt%, S≤0.035wt%, the rest is Fe and unavoidable impurities;

[0018] B. Pre-smelting process: In step A, after the high-manganese, low-silicon, high-phosphorus molte...

Embodiment 1

[0029] A. Smelting and loading process: pour out all the final slag in the converter after tapping the steel in the upper furnace and splashing the slag, according to 130kg / t 钢 The ratio of scrap steel is loaded into the 50-ton LD converter with the following mass ratio of scrap steel: C 0.17wt%, Si 0.40wt%, Mn 1.25wt%, P0.036wt%, S0.035wt%, the rest is Fe and unavoidable impurity; according to 940kg / t 钢 The molten iron is loaded into the ratio, and the following temperature and mass ratio of high-manganese, high-silicon, and high-phosphorus molten iron are added to a 50-ton LD converter: molten iron temperature 1290 ° C, molten iron composition C4.5wt%, Si 0.70wt%, Mn 1.10wt%, P 0.120wt%, S 0.020wt%, the rest is Fe and unavoidable impurities.

[0030] B. Pre-smelting process: In step A, the high-manganese, low-silicon, high-phosphorus molten iron and steel scrap cold material are loaded into a 50-ton LD converter, and the front and rear shaking furnaces expose the molten iro...

Embodiment 2

[0035] A. Smelting and loading process: pour out all the final slag in the converter after tapping the steel in the upper furnace and splashing the slag, according to 140kg / t 钢 The ratio of steel scrap is loaded into a 50-ton LD converter with the following mass ratios of steel scrap: C 0.20wt%, Si 0.50wt%, Mn 1.38wt%, P0.042wt%, S 0.040wt%, the rest is Fe and unavoidable impurity; according to 930kg / t 钢 The molten iron is loaded into the ratio, and the following temperature and mass ratio of high-manganese, high-silicon, and high-phosphorus molten iron are added to a 50-ton LD converter: molten iron temperature 1300 ° C, molten iron composition C4.9wt%, Si 0.85wt%, Mn 1.30wt%, P 0.145wt%, S0.030wt%, the rest is Fe and unavoidable impurities.

[0036] B. Pre-smelting process: In step A, after the high-manganese, low-silicon, high-phosphorus molten iron and steel scrap cold material are loaded into a 50-ton LD converter, the front and rear shaking furnaces expose the molten ir...

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Abstract

The invention discloses a preparation method for carbon extracting and manganese retaining of high-manganese high-silicon and high-phosphorus molten iron through converter smelting, wherein the high-manganese high-silicon and high-phosphorus molten iron comprises, by weight, 1.10-1.50% of Mn, 0.70-1.00% of Si, 0.120-0.170% of P, and 0.035% or the less of S. According to the preparation method, theprocesses such as slag retaining operation, double-slag slag making process, less slag smelting, constant-pressure gun changing operation in the smelting process, converter direct lowest-gun-positiongun pressing operation, slag washing in the steel discharging process, and whole-process bottom argon blowing are adopted and integrally innovated, thus kinetics and thermodynamic conditions of a smelting reaction are optimized, the good smelting slagging dephosphorization and desulfurization effects are obtained, splashing of molten steel and slag in the smelting process is avoided, the distribution concentration in the slag (MnO) is effectively increased, reduction in the slag (MnO) at the smelting medium stage is promoted, re-oxidation of Mn in the molten steel at the smelting later stageis lowered, the end point molten steel residual Mn content (0.35-0.55wt%) is significantly increased, the adding amount of a manganese-series alloy in the deoxidizing alloying process is reduced, steelmaking alloy consumption and the alloying cost are significantly lowered, and the product market competitiveness is improved.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy and steelmaking technology, and in particular relates to a converter smelting method for high-manganese, high-silicon, and high-phosphorus molten iron that extracts carbon and preserves manganese. Background technique [0002] Manganese (Mn) element is a beneficial element in steel. During the converter smelting process, with the continuous blowing process, most of the Mn in the molten iron is oxidized. The alloy cost is higher. The Mn content of molten steel at the end of converter smelting mainly comes from Mn in molten iron. During the blowing process, manganese oxidation and reduction reactions occur between the molten metal pool, slag and oxygen, and the residual Mn content in molten steel at the end of converter is affected by The influence of factors such as the amount of slag, the oxidation of molten steel and slag at the end of the converter, and the temperature at the ...

Claims

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Application Information

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IPC IPC(8): C21C5/30C21C7/068
CPCC21C5/30C21C7/068Y02P10/20
Inventor 陈伟张卫强陈必胜李金柱文玉兵邓家木苏华林杨冠龙刘红兵
Owner WUKUN STEEL
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