A high-efficiency slagging and desulfurization smelting process for lf aluminum-killed steel

An aluminum-killed steel and slag-making technology, applied in the field of smelting, can solve the problems of adding metal calcium, which is difficult to control, increase production costs, and unstable desulfurization, so as to shorten the treatment period, reduce slag consumption and energy consumption, and reduce the burden of desulfurization Effect

Active Publication Date: 2022-02-01
MAANSHAN IRON & STEEL CO LTD
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AI Technical Summary

Problems solved by technology

However, calcium metal is a relatively active element. It is difficult to control the addition of calcium metal after the converter is tapped so that it will not be oxidized, resulting in unstable desulfurization in the production process and increasing production costs.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] This embodiment is a smelting method for LF aluminum killed steel with high efficiency slagging and desulfurization in the process path of "300t converter→argon blowing station→RH→continuous casting". The steel type is SPHC, and the specific steps are as follows:

[0033] (1) Converter steelmaking: 53.2 tons of steel scrap into the furnace, 272 tons of hot metal into the furnace; the end temperature of converter blowing is 1624 ° C, the end point of oxygen is 546 ppm; the bottom blowing intensity is increased in the later stage of converter blowing, and the stirring of the molten pool is strengthened;

[0034] (2) In the steel tapping process, the infrared slag detection is used, and the slag blocking cone + pneumatic slag blocking are used to strictly control the amount of slag falling in the converter; when 1 / 5 of the steel is tapped, the alloy and auxiliary materials are added through the rotating trough, and the rotating trough is dynamically adjusted during the adding ...

Embodiment 2

[0043] This embodiment is a smelting method for LF aluminum killed steel with high efficiency slagging and desulfurization in the process path of "300t converter→argon blowing station→RH→continuous casting". The steel type is SPHC, and the specific steps are as follows:

[0044] (1) Converter steelmaking: 60.8 tons of steel scrap into the furnace, 267 tons of hot metal into the furnace; the end temperature of converter blowing is 1656 ° C, the end point of oxygen is 471ppm; the bottom blowing intensity is increased in the later stage of converter blowing, and the stirring of the molten pool is strengthened;

[0045] (2) In the steel tapping process, the infrared slag detection is used, and the slag blocking cone + pneumatic slag blocking are used to strictly control the amount of slag falling in the converter; when 1 / 5 of the steel is tapped, the alloy and auxiliary materials are added through the rotating trough, and the rotating trough is dynamically adjusted during the adding...

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Abstract

The invention discloses a high-efficiency slagging and desulfurization smelting process for LF aluminum-killed steel. Bottom blowing mode strengthens molten pool agitation. The high-efficiency slagging and desulfurization smelting process of LF aluminum-killed steel adjusts the task division of converter tapping, argon blowing station and LF refining through process design, forming a "trinity" refining process of converter tapping, argon blowing station and LF refining, making LF The slagging work was moved forward, and a rapid slagging process system was formulated. Through design optimization, more than 80% of the slagging material was added in the tapping process, and the impact kinetic energy of the tapping steel flow, the sensible heat of molten steel and the stirring power of argon blowing at the bottom of the ladle were fully utilized. The chemical conditions promote the melting of slag material; the argon station adopts top-bottom strong stirring and appropriate deoxidation process to quickly form slag to promote steel slag reaction, realize top slag reduction pre-desulfurization, and reduce the burden of LF slagging and desulfurization; LF target basically completes slagging and desulfurization at one time Task.

Description

technical field [0001] The invention relates to the technical field of smelting, in particular to a smelting process for efficient slagging and desulfurization of LF aluminum killed steel. Background technique [0002] As an important smelting process, LF furnace refining is one of the main functions of slagging and desulfurization. Although it can meet the production requirements for steel grades below 20ppm sulfur, the refining process takes a long time and there is room for further improvement in desulfurization rate. The long refining cycle leads to the increase of power consumption, electrode consumption, argon gas consumption, and the decrease of the service life of ladle refractory materials. At the same time, it often leads to the occurrence of continuous casting casting speed drop or even broken pouring accidents due to node reasons. Frequent changes in casting speed are also It will have a great impact on the quality of the slab. Compared with converter smelting a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/064C21C5/36C21C7/06
CPCC21C7/064C21C5/36C21C7/06Y02P10/20
Inventor 王泉黄传根毛鸣徐小伟沈广文周亚辉舒宏富乌琼胡晓光
Owner MAANSHAN IRON & STEEL CO LTD
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