A kind of preparation method of converter smelting high manganese high phosphorus iron water to extract carbon and preserve manganese

A converter smelting and molten iron technology, which is applied in the direction of manufacturing converters and improving process efficiency, can solve the problem of no relevant research reports on the smelting process of carbon extraction and manganese preservation, and achieves the improvement of smelting technical and economic indicators, and excellent slag removal. Phosphorus effect, good slag dephosphorization effect

Active Publication Date: 2020-03-20
WUKUN STEEL
View PDF4 Cites 0 Cited by
  • 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%, Si 0.30-0.55wt%, P≤0.100wt%). There are certain research reports on the process, but there is no relevant research report on the smelting process using high-manganese and high-phosphorus hot metal to extract carbon and preserve manganese

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0016] The preparation method of converter smelting high-manganese-high-phosphorus iron water to extract carbon and preserve manganese 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, 3 / 4 of the final slag is kept in the converter, according to 3.0kg / t 钢 The amount, add conventional active lime to the converter; according to 115-145kg / t 钢 The scrap steel is put into the ratio, and the scrap steel is added to the 50-ton LD converter; according to 20kg / t 钢 Put the pig iron into the ratio, and add pig iron to the 50-ton LD converter; according to 910-940kg / t 钢 The molten iron is loaded into the ratio, and the following temperature and mass ratio of high-manganese, low-silicon, and high-phosphorus molten iron are added to a 50-ton LD converter: molten iron temperature ≥ 1285 ° C, molten iron composition C3.8-4.5wt%, Si 0.25-0.50wt%, Mn 1.20-1.70wt%, P 0.130-0...

Embodiment 1

[0029] A. Smelting and loading process: After the steel tapping and slag splashing of the upper furnace, 3 / 4 of the final slag is kept in the converter, according to 3.0kg / t 钢 The amount, add conventional active lime to the converter; according to 115kg / t 钢 The ratio of steel scrap is loaded into a 50-ton LD converter with the following mass ratios of steel scrap: C 0.12wt%, Si 0.15wt%, Mn 0.40wt%, P 0.025wt%, S 0.018wt%, the rest is Fe and unavoidable impurity; according to 20kg / 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 3.2wt%, Si 0.30wt%, Mn 0.30wt%, P 0.070wt%, S 0.020wt%, the rest is Fe and unavoidable impurity; according to 940kg / t 钢 The proportion of molten iron is loaded, and the following temperature and mass ratio of high-manganese, low-silicon, and high-phosphorus molten iron are added to a 50-ton LD converter: molten iron temperature 1285 ° C, molten iron composition C 3.8wt%, Si 0.25wt...

Embodiment 2

[0035] A. Smelting and loading process: After the steel tapping and slag splashing of the upper furnace, 3 / 4 of the final slag is kept in the converter, according to 3.0kg / t 钢 The amount, add conventional active lime to the converter; according to 125kg / t 钢 The ratio of steel scrap is loaded into a 50-ton LD converter with the following mass ratio of steel scrap: C 0.15wt%, Si 0.22wt%, Mn 0.55wt%, P 0.030wt%, S 0.026wt%, the rest is Fe and unavoidable impurity; according to 20kg / 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 3.4wt%, Si 0.40wt%, Mn 0.40wt%, P 0.080wt%, S 0.028wt%, the rest is Fe and unavoidable impurity; according to 925kg / t 钢 The proportion of molten iron is charged, and the following temperature and mass ratio of high-manganese, low-silicon, and high-phosphorus molten iron are added to a 50-ton LD converter: molten iron temperature 1300 ° C, molten iron composition C 4.1wt%, Si 0.38wt...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a preparation method for carbon extraction and manganese consercation in medium-manganese high-phosphorus molten steel (Mn is 1.20-1.70wt%, Si is 0.25-0.50wt%, P is 0.130-0.200wt% 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, 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, smeltingreaction kinetic 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 allocation concentration 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 (0.35-0.60wt%), 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 converting high-manganese and high-phosphorus iron into water to extract carbon and preserve 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 end of the c...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/32C21C7/064C22C38/04
CPCC21C5/32C21C7/064C22C38/04Y02P10/20
Inventor 陈伟张卫强高连坤陈必胜李金柱文玉兵徐涛王翔陈爱林苏灿东王文峰
Owner WUKUN STEEL
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap