Method for maintaining converter

A technology for converters and protective furnaces, applied in the manufacture of converters, etc., can solve problems such as easy blockage of ventilating elements at the bottom of the furnace, affecting the service life of the oxygen lance, and affecting the smelting process

Inactive Publication Date: 2006-07-05
SHANGHAI NO 1 IRON & STEEL CO LTD BAOGANG GRP
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Disadvantages of this furnace protection method: 1) higher equipment investment (N 2 pipeline laying); 2) The oxygen lance is easy to stick to cold steel, which affects the service life of the oxygen lance; 3) The ventilation element at the bottom of the furnace is easy to block, which affects the smelting process

Method used

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Embodiment Construction

[0027] The air-permeable element blowing at the bottom of the converter is adopted in the present invention, and the inert gas (N 2 , Ar) to spray the slag on the surface of the converter lining, which can also form a certain thickness of the slag layer on the furnace lining to protect the furnace lining.

[0028] The specific steps: after the converter is tapped, when the end point temperature of the converter is greater than 1680°C or Free[O] is greater than 800ppm, add a certain proportion of slag-adjusting materials, mainly including dolomite and magnesite balls, and the input amount of slag-adjusting materials is controlled Control the slag (MgO) content above 8% at 5% to 15% of the total slag amount; tilt the converter back and forth to speed up the adjustment and fusion of the slag, and at the same time make part of the slag adhere to the front and rear furnace walls; set the bottom blowing flow rate , hang-coat the tempered slag on the surface of the furnace wall; cont...

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Abstract

This invention relates to a lining protection method for converter with detailed process as follows: investigate the circumstance of slag after tapping of converter and add some slag coordinating materials into high-temperature and high-oxidative slag so as to keep the MgO content in the slag above 8%; tilt the converter back and forth so as to enhance the fusion of the slag and make partial slag coherent to the converter wall; set the bottom blowing flux and split the quenched and tempered slag onto the wall surface by bottom blowing ventilating components; the control of bottom blowing flux can be modulated according to the lining corrosion and slag circumstances. In this invention, bottom blowing ventilating components are employed and nitrogen and argon are blowing for slag splitting and deposition. Therefore, the line slag, molten pool and ear-axis areas, which are usually corroded most seriously, can be effectively protected. Difficult issues such as sticking lances and burning lances of oxygen lances and bottom rising in the lining protection process of top blowing slag splitting and flow blockage of bottom blowing ventilating components in top and bottom blowing converter are completely avoided. Besides, it also significantly weakens the corrosion of feeble sites of lining and displays considerable lining protection effect.

Description

technical field [0001] The invention belongs to the field of converter smelting, and in particular relates to a process for protecting a converter. Background technique [0002] The existing methods for protecting the converter include the method of repairing the furnace for protecting the furnace, and the method of protecting the furnace by splashing slag with a converter top gun. Among them, the furnace repairing material protection method mainly uses a certain proportion and particle size of the furnace repairing material to cover the eroded furnace lining surface. Since the furnace repairing material is mainly composed of magnesia, graphite, binder, etc., it has a high degree of refractoriness. Therefore, it can protect the furnace lining and reduce corrosion under steelmaking conditions. [0003] Furnace repair material protection mainly uses gunning machine or hopper to spray or flatten the furnace lining surface, so that the furnace repair material adheres to the fur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/28C21C5/46
Inventor 邵世杰蒋兴元茅卫东左开山胡越
Owner SHANGHAI NO 1 IRON & STEEL CO LTD BAOGANG GRP
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