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A preparation method for extracting carbon and preserving manganese from manganese-high-phosphorus iron in converter smelting

A converter smelting and molten iron technology, which is applied in the manufacture of converters and the improvement of process efficiency, can solve the problems of no relevant research reports on the process of carbon extraction and manganese preservation, and achieve good slag dephosphorization effect and good smelting slag dephosphorization Effect, the effect of improving product market competitiveness

Active Publication Date: 2020-03-20
WUKUN STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, domestic steel mills basically adopt low-Mn and low-P molten iron with the following chemical composition (Mn≤0.50wt%, Si0.30-0.55wt%, P≤0.090wt%). There are certain research reports on the smelting process, but there is no relevant research report on the process of using medium manganese and high phosphorus molten iron to smelt carbon and preserve manganese

Method used

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preparation example Construction

[0016] The preparation method for extracting carbon and preserving manganese from manganese-high-phosphorus iron in converter smelting of the present invention comprises the following process steps:

[0017] A. Smelting and loading process: After the steel tapping and slag splashing of the upper furnace, 1 / 2 of the final slag is kept in the converter, according to 2.0-3.0kg / t 钢 The amount, add conventional active lime to the converter; according to 115-135kg / t 钢 The scrap steel is put into the ratio, and the scrap steel is added to the 50-ton LD converter; according to 30kg / t 钢 The pig iron is put into the ratio, and the pig iron is added to the 50-ton LD converter; after that, it is 910-930kg / t 钢 The molten iron is loaded into the ratio, and the following temperature and mass ratio of high-manganese and high-phosphorus molten iron are added to the 50-ton LD converter: molten iron temperature ≥ 1280 ° C, molten iron composition C4.0-5.0wt%, Mn0.70-0.90wt%, Si 0.25-0.45wt%, P...

Embodiment 1

[0030] A preparation method for extracting carbon and preserving manganese from manganese-high-phosphorus iron in converter smelting, comprising the following process steps:

[0031] A. Smelting and loading process: After the steel tapping and slag splashing of the upper furnace, 1 / 2 of the final slag is kept in the converter, according to 2.0kg / t 钢 The amount, add conventional active lime to the converter; according to 115kg / t 钢 The proportion of steel scrap is loaded into the 50-ton LD converter with the following mass ratio of steel scrap: C 0.22wt%, Si 0.40wt%, Mn 1.20wt%, P 0.025wt%, S 0.018wt%, the rest is Fe and unavoidable impurity; according to 30kg / t 钢 The proportion of pig iron loaded into the 50-ton LD converter is added with the following mass ratio of pig iron: C3.2wt%, Si 0.30wt%, Mn 0.30wt%, P 0.070wt%, S 0.020wt%, the rest is Fe and unavoidable impurity) into the LD converter; then press 930kg / t 钢 The proportion of molten iron is loaded, and the following t...

Embodiment 2

[0037] A preparation method for extracting carbon and preserving manganese from manganese-high-phosphorus iron in converter smelting, comprising the following process steps:

[0038] A. Smelting and loading process: after the steel tapping and slag splashing of the upper furnace, 1 / 2 of the final slag is kept in the converter, according to 2.5kg / t 钢 The amount, add conventional active lime to the converter; according to 125kg / t 钢 The proportion of scrap steel is loaded into the 50-ton LD converter with the following mass ratio of scrap steel: C 0.24wt%, Si 0.49wt%, Mn 1.35wt%, P 0.032wt%, S 0.025wt%, the rest is Fe and unavoidable impurity; according to 30kg / t 钢 The proportion of pig iron loaded into the 50-ton LD converter is added with the following mass ratio of pig iron: C 3.3wt%, Si 0.40wt%, Mn 0.40wt%, P 0.080wt%, S 0.028wt%, the rest is Fe and unavoidable impurity) into the LD converter; then press 920kg / t 钢 The proportion of molten iron is loaded, and the following ...

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Abstract

The invention discloses a preparation method for carbon extraction and manganese consercation in medium-manganese high-phosphorus molten steel (Mn is 0.70-0.90wt%, Si is 0.25-0.45wt%, P is 0.120-0.220wt% and S is less than or equal to 0.040wt%) in converter steel making. By adopting the preparation method, processes such as slag retention operation, continuous casting slag application, little slagsmelting, constant pressure gun conversion operation in the smelting process, lowest gun position pressing operation in primary pouring of a converter, and slag wash of whole-process steel discharge,are integrated and created, rapid slag formation in the smelting process is promoted, smelting reaction kinetic and thermodynamic conditions are improved, excellent slagging and phosphorus removal effects are achieved, molten steel and slag splashing in the smelting process is avoided, a MnO allocation concentration is effectively increased, reduction of the MnO at the medium stage of smelting ispromoted, secondary oxidation of Mn in molten steel at the later smelting stage is reduced, furthermore, the content of residual Mn in the molten steel at a final point is remarkably increased (0.25-0.40wt%), the addition amount of a manganese alloy in a deoxidation alloying process is reduced, the steel making alloy consumption and alloying cost can be remarkably reduced, and the market competitiveness of products can be improved.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy and steelmaking technology, and specifically relates to a preparation method for extracting carbon and preserving manganese from manganese and high phosphorus iron in converter smelting. 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 end of the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/32C21C7/064C22C38/04
CPCC21C5/32C21C7/064C22C38/04Y02P10/20
Inventor 陈伟张卫强王炳海吴光耀杨春雷欧阳晨曦文玉兵曹重付士富陈大双王定树
Owner WUKUN STEEL
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