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Rapid slag-forming method for dephosphorization of semi-steel with less slag

A smelting method and slagging technology, which is applied in the field of dephosphorization of semi-steel with less slag and can solve the problems of long slagging time and large consumption of auxiliary materials, so as to shorten the slagging time and short slagging time Effect

Active Publication Date: 2021-08-17
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 and start blowing, 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, an...

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 rapid slag-forming semi-steel and less slag dephosphorization smelting method, belonging to the technical field of iron and steel smelting, comprising the following steps: (1) adding a composite slagging agent after splashing slag to protect the furnace under the condition that there is slag in the converter Adjust the basicity of the slag to 2-2.5, mix it with semi-steel, and then carry out blowing and slagging under the conditions of top blowing oxygen supply and bottom blowing gas supply. During the blowing process, add a compound slagging agent to control the slag basicity 1.5‑2, after the blowing is completed, pour the furnace and discharge the slag; (2) Step (1) After the slag discharge, add high-magnesia lime and active lime to the converter under the condition of top-blowing oxygen supply and bottom-blowing gas supply to control the end-point slag The basicity is 3-4, blowing to obtain qualified molten steel, tapping, all slag, obtain the slag B that exists in the converter; (3) step (1)-(2) is carried out in circulation, wherein, step ( In 1), the slag initially present in the converter is the slag B obtained in 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 Patents(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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