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Semi-steel less slagging dephosphorization smelting method capable of rapid slagging

A smelting method and a slag-forming technology are applied in the field of rapid slag-forming semi-steel low-slag dephosphorization smelting, which can solve the problems of large consumption of auxiliary materials and long slag-forming time, and achieve a shortened slag-forming time and short slag-discharging time. Effect

Active Publication Date: 2019-06-21
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is: when the semi-steel is smelted by the double slag method, the time for slag forming is long and the consumption of auxiliary materials is relatively large

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A 120t converter in a factory uses semi-steel for steelmaking, and the phosphorus content of the semi-steel entering the furnace is 0.080%. The method of the present invention is used for smelting. After the slag is left in the previous furnace, only a compound slagging agent is added to the converter to control the initial slag basicity to 2. , and then add 6t of scrap steel, mix it with semi-steel, put down the lance to start blowing, and the oxygen supply intensity of the top blowing oxygen lance is 2m 3 / (t steel min), the blowing gun position is controlled at 1.2m-1.3m, the bottom blowing flow rate is 1200NL / min; when the blowing is 1.5min, the compound slagging agent is added again to reduce the slag alkalinity to 1.5, and the oxygen blowing is continued to The furnace was poured for slag at 3 minutes, the phosphorus content in molten steel was 0.019%, the amount of slag discharged was 92wt% of the total amount of slag, the flow rate of bottom blowing was 500NL / min,...

Embodiment 2

[0037] A 120t converter in a factory uses semi-steel for steelmaking, and the phosphorus content of the semi-steel entering the furnace is 0.060%. The method of the present invention is used for smelting. After the slag is left in the previous furnace, only a compound slag-forming agent is added to the converter to control the initial slag basicity to 2.3, and then 7t of scrap steel is added. The oxygen supply strength of the gun is 2.3m 3 / (t steel min), the blowing gun position is controlled at 1.3m-1.4m, and the bottom blowing flow rate is 1400NL / min; when blowing for 2 minutes, add a compound slagging agent again to reduce the slag alkalinity to 1.8, and continue blowing oxygen to 3.2 The furnace is poured to discharge slag at min. When the furnace is discharged, the phosphorus content in molten steel is 0.018%, and the amount of slag discharged is 85wt% of the total amount of slag. Secondary slagging is carried out after slagging. During the secondary slagging, only high...

Embodiment 3

[0040] A 120t converter in a factory uses semi-steel for steelmaking, and the phosphorus content of the semi-steel entering the furnace is 0.075%. The method of the present invention is used for smelting. After the slag is left in the previous furnace, only a compound slagging agent is added to the converter to control the basicity of the initial slag to 2.5, and then 8t of scrap steel is added. The oxygen supply strength of the gun is 2.5m 3 / (t steel min), the blowing gun position is controlled at 1.4m-1.5m, the bottom blowing flow rate is 1600NL / min; when the blowing is 2.5min, the compound slagging agent is added again to reduce the slag alkalinity to 2, and the oxygen blowing is continued to The slag was poured in 3.5 minutes. The phosphorus content in molten steel was 0.018% when the furnace was poured. The amount of slag discharged was 80wt% of the total amount of slag. Secondary slagging is carried out after slagging. During the secondary slagging, only 15kg / t of high...

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Abstract

The invention discloses a semi-steel less slagging dephosphorization smelting method capable of rapid slagging, and belongs to the technical field of steel smelting. The semi-steel less slagging dephosphorization smelting method includes the following steps that (1) under the condition that slag exists in a converter, the basicity of the slag is adjusted to be 2-2.5 by adding a composite slag forming agent after converter protection by slag splashing, semi-steel is blended, then under the condition of top blowing oxygen supply and bottom blowing gas supply, blowing and slag forming are conducted, the basicity of the slag is controlled to be 1.5-2 by adding the composite slag forming agent in the process of blowing, and after blowing is completed, turning down and slagging are conducted; (2) after slagging in the step (1), the basicity of the final slag is controlled to be 3-4 by adding high-magnesium lime and active lime into the converter under the condition of top blowing oxygen supply and bottom blowing gas supply, blowing is conducted until qualified molten steel is obtained, and slag B existing in the converter is obtained after steel tapping and all slag remaining; and (3) the step (1) and the step (2) are cycled, wherein the original slag existing in the converter in step (1) is the slag B obtained in the step (2).

Description

technical field [0001] The invention belongs to the technical field of iron and steel smelting, and in particular relates to a dephosphorization smelting method for rapid slag formation of semi-steel and less slag. Background technique [0002] my country is rich in vanadium-titanium magnetite resources. Domestic iron and steel enterprises such as Panzhihua Iron and Steel, Chenggang, Kunming Iron and Steel, and Weiyang Iron and Steel all use vanadium-titanium magnetite for smelting. The main raw material for converter steelmaking is to use a special converter to extract vanadium. The semi-steel, the carbon mass percentage content of the semi-steel obtained after desulfurization and vanadium-containing molten iron is 3.4%-4.0%, the content of silicon and manganese heating slag-forming elements in the semi-steel are all traces, and the mass percentage content of phosphorus is 0.060%-0.080%, so semi-steel smelting has the characteristics of less acidic slagging substances, single...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/36C21C5/35C21C7/064
CPCY02P10/20
Inventor 陈均曾建华杨森祥梁新腾
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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