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

A technology for converter smelting and molten iron, applied in the manufacture of converters, improvement of process efficiency, etc., can solve problems such as carbon extraction and manganese preservation process, achieve good smelting slag dephosphorization effect, good slag dephosphorization, avoid spraying splash effect

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 use low-Mn and low-P molten iron with the following chemical compositions (Mn≤0.60wt%, Si0.30-0.55wt%, P≤0.100wt%). There are certain research reports on the converter smelting process, but there is no relevant research report on the process of using medium manganese, low silicon and high phosphorus molten iron to smelt carbon and preserve manganese

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

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

[0017] A. Smelting and charging process: after the steel tapping and slag splashing of the upper furnace, all the final slag is kept in the converter, according to 3.0-4.0kg / t 钢 The amount, add light burnt dolomite to the converter; according to 110-140kg / t 钢 The scrap steel is loaded into the ratio, and the scrap steel is added to the 50-ton LD converter; after that, it is 930-960kg / t 钢 The proportion of molten iron is loaded, and the following temperature and mass ratio of medium manganese, low silicon and high phosphorus molten iron are added to a 50-ton LD converter: molten iron temperature ≥ 1320 ° C, molten iron composition C 4.2-4.8wt%, Mn0.70-0.90wt%, Si 0.06-0.15wt%, P 0.130-0.220wt%, S≤0.045wt%, the rest is Fe and unavoidable impurities;

[0018...

Embodiment 1

[0029] A method for preparing manganese, low-silicon, and high-phosphorus iron in converter smelting by extracting carbon and preserving manganese in water, comprising the following process steps:

[0030] A. Smelting and loading process: After the steel tapping and slag splashing of the upper furnace, all the final slag is kept in the converter, according to 3.0kg / t 钢 The amount, add light burnt dolomite to the converter; according to 110kg / 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 Impurities; then press 960kg / t 钢 The proportion of molten iron is loaded, and the following temperature and mass ratio of medium manganese, low silicon and high phosphorus molten iron are added to a 50-ton LD converter: molten iron temperature 1320 ° C, molten iron composition C 4.2wt%, Mn0.70wt%, Si 0.06wt%, P0 .130wt%, S 0.025wt%,...

Embodiment 2

[0036] A method for preparing manganese, low-silicon, and high-phosphorus iron in converter smelting by extracting carbon and preserving manganese in water, comprising the following process steps:

[0037] A. Smelting and loading process: after the steel tapping and slag splashing of the upper furnace, all the final slag is kept in the converter, according to 3.5kg / t 钢 The amount of light-burned dolomite is added 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 Impurities; then press 945kg / t 钢 The proportion of molten iron is loaded, and the following temperature and mass ratio of medium manganese, low silicon and high phosphorus molten iron are added to a 50-ton LD converter: molten iron temperature 1335 ° C, molten iron composition C 4.5wt%, Mn0.80wt%, Si 0.10wt%, P0 .175wt%, S 0...

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PUM

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Abstract

The invention discloses a preparation method for carbon extraction and manganese consercation in medium-manganese low-silicon high-phosphorus molten steel (Mn is 0.70-0.90wt%, Si is 0.06-0.15wt%, P is0.130-0.220wt% and S is less than or equal to 0.045wt%) in converter steel making. By adopting the preparation method, processes such as slag retention operation, continuous casting slag application,little slag smelting, 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, low-silicon molten steel smelting slagging elements and heat sources are increased, rapid slag formation in the smelting process is promoted, smelting reactionkinetic and thermodynamic conditions are improved, excellent slugging and phosphorus removal effects are achieved, molten steel and slag splashing in the smelting process is avoided, a MnO allocationconcentration is effectively increased, reduction of the MnO at the medium stage of smelting is promoted, 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 (0.25-0.38wt%), 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 molten iron with low manganese, low silicon and high phosphorus 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 ...

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 陈伟张卫强吴光耀邹荣欧阳晨曦李金柱付士富赵卫东陈大双王定树
Owner WUKUN STEEL
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