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Converter tapping, slag washing and refining process

A technology of tapping slag and converter, which is applied in the field of converter tapping slag washing and refining process, can solve the problems affecting continuous casting smooth pouring, high production cost, and continuous casting flocculation nozzle, so as to reduce production cost, low production cost, and reduce refining The effect of equipment

Inactive Publication Date: 2020-02-18
唐山瑞丰钢铁(集团)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If some kinds of steel or aluminum-killed steel are not refined, more Al will be generated during the deoxidation process. 2 o 3 Inclusions, and this inclusion does not effectively remove the Al in the process of continuous casting 2 o 3 Such inclusions will adhere to the inner wall of the continuous casting upper nozzle and the submerged nozzle, resulting in continuous casting flocculation, affecting the smooth pouring of continuous casting, thereby affecting normal production, and the quality of steel products cannot be guaranteed
However, the investment in molten steel refining equipment is large and the production cost is high, so the steelmaking and tapping slag washing and refining process has been developed.
[0003] Chinese patent 201010146899.X discloses a converter tapping slag washing and pre-desulfurization refining process. The invention uses synthetic slag at the bottom of the ladle before tapping, and continuously and uniformly adds lime along with the steel flow for 2 minutes after tapping. The method is characterized by Research on the desulfurization of the slag washing process, but did not analyze the deoxidation and removal of inclusions in the slag washing process, and there are differences in the composition of the slag washing material and the parameters of the slag washing process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Steel type SPHC, 120t converter tapping, tapping temperature 1650℃.

[0028] (1) Raw material preparation

[0029] The main raw material is desulfurization and deoxidation by using aluminum-containing pre-melted slag washing material, aluminum particles and lime slag. Among them, the aluminum-containing pre-melted slag washing material is composed of the following raw materials by weight percentage: CaO: 39%~45%, Al 2 o 3 : 28~35%, SiO 2 : 0%~5%, MgO: 0%~5%, Al: 7%~10%, CaF 2 : 4%~10%, particle size 10~30mm; aluminum particles, composed of the following raw materials by weight percentage: Al≥99.9%; white ash small slag, composed of the following raw materials by weight percentage: CaO: 85%~93%, SiO 2 : 0%~3%, activity ≥ 320, particle size 10~40mm.

[0030] (2) Strong desulfurization and deoxidation

[0031] Converter tapping and strong desulfurization and deoxidation are carried out almost at the same time, so strong desulfurization and deoxidation are controlled ...

Embodiment 2

[0040] Steel type Q235BL, 120t converter tapping, tapping temperature 1643°C.

[0041] (1) Raw material preparation

[0042] The main raw material is desulfurization and deoxidation by using aluminum-containing pre-melted slag washing material, aluminum particles and lime slag. Among them, the aluminum-containing pre-melted slag washing material is composed of the following raw materials by weight percentage: CaO: 39%~45%, Al 2 o 3 : 28~35%, SiO 2 : 0%~5%, MgO: 0%~5%, Al: 7%~10%, CaF 2 : 4%~10%, particle size 10~30mm; aluminum particles, composed of the following raw materials by weight percentage: Al≥99.9%; white ash small slag, composed of the following raw materials by weight percentage: CaO: 85%~93%, SiO 2 : 0%~3%, activity ≥ 320, particle size 10~40mm.

[0043] (2) Strong desulfurization and deoxidation

[0044] Converter tapping and strong desulfurization and deoxidation are carried out almost at the same time, so strong desulfurization and deoxidation are controll...

Embodiment 3

[0053] Steel type Q195L, 120t converter tapping, tapping temperature 1648°C.

[0054] (1) Raw material preparation

[0055] The main raw material is desulfurization and deoxidation by using aluminum-containing pre-melted slag washing material, aluminum particles and lime slag. Among them, the aluminum-containing pre-melted slag washing material is composed of the following raw materials by weight percentage: CaO: 39%~45%, Al 2 o 3 : 28~35%, SiO 2 : 0%~5%, MgO: 0%~5%, Al: 7%~10%, CaF 2 : 4%~10%, particle size 10~30mm; aluminum particles, composed of the following raw materials by weight percentage: Al≥99.9%; white ash small slag, composed of the following raw materials by weight percentage: CaO: 85%~93%, SiO 2 : 0%~3%, activity ≥ 320, particle size 10~40mm.

[0056] (2) Strong desulfurization and deoxidation

[0057] Converter tapping and strong desulfurization and deoxidation are carried out almost at the same time, so strong desulfurization and deoxidation are controlle...

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Abstract

The invention relates to a converter tapping, slag washing and refining process, and belongs to the technical field of steelmaking. In terms of strong desulphurization and deoxidization of the process, during converter tapping, when molten steel is fully laid at the bottom of a ladle, a slag washing material and small lime slag are continuously and evenly put into the steel ladle through an alloychute; when converter tapping is carried out for 1 minute, aluminum particles are added for strong deoxidization, and the addition amount of the aluminum particles is 1.5-2.5 kilograms per tonnage ofsteel; in the tapping process, the flow of argon blown at the bottom of the steel ladle is larger than or equal to 500 ML / min; when tapping ends, aluminum particles are added to the slag side of the steel ladle for slag deoxidization, and the addition amount is 0.3-0.5 kg / t; and the steel slag oxidability (FeO+MnO) is smaller than or equal to 2%. The desulphurization and deoxidization are realizedthrough the tapping and slag washing process without a refining furnace, impurities in steel are effectively removed, the continuous casting castability is improved, and the cleanliness of a castingblank is improved.

Description

technical field [0001] The invention relates to a process for washing and refining converter tapping slag, which belongs to the technical field of steelmaking. Background technique [0002] At present, when most steel mills produce variety steel or aluminum-killed steel, in order to ensure product quality or to ensure continuous casting in multiple furnaces, the molten steel out of the furnace must go through a series of out-of-furnace refining treatments such as LF furnace, RH, VD, etc. The role of molten steel refining is to deoxidize, desulfurize and remove inclusions, etc., to ensure the quality of the variety of steel. If some kinds of steel or aluminum-killed steel are not refined, more Al will be generated during the deoxidation process. 2 o 3 Inclusions, and this inclusion does not effectively remove the Al in the process of continuous casting 2 o 3 Such inclusions will adhere to the inner wall of the continuous casting nozzle and the submerged nozzle, thereby ca...

Claims

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Application Information

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IPC IPC(8): C21C5/36C21C7/06C21C7/064
CPCC21C5/36C21C7/06C21C7/0645
Inventor 孙仕良张立强王延峰沈武李雪松鲁宪红崔登云刘卓超郭子昂张龙徐子娟王伟王华代高生李宏超周兴焘郑方兴孙雅江齐超群侯朝君张超
Owner 唐山瑞丰钢铁(集团)有限公司
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