A maintenance method for converter lining

A converter lining and slag technology, which is applied in the manufacture of converters and other directions, can solve the problems of long time consumption and high labor intensity, and achieve the effects of short time consumption, prolonged operation time and improved maintenance effect.

Active Publication Date: 2017-12-26
QIANAN CITY JIUJIANG WIRE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although wet gunning and brick repairing can repair the parts with severe lining loss, it takes too long (generally 40-60 minutes) and labor-intensive

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] After the converter is tapped, the slag splashing treatment is not carried out, the carbon content of the steel obtained after the converter is tapped is measured to be 0.06%, the content of FeO in the converter slag is 14.5%, and the basicity of the slag is 3.8. Shake the furnace to the ironing position. The angle between the furnace mouth and the ground is required to be 45°. Use the hopper to add 1.4t of raw dolomite with a particle size of 60mm and 0.7t of limestone into the furnace. When feeding, shake the furnace while feeding. Fully mix the filling material and slag, and evenly spread it on the 2 square meters defect formed on the furnace lining. Splash slag at refining position for 2.5 minutes.

Embodiment 2

[0043] After the converter is tapped, the slag splashing treatment is not carried out, the carbon content of the steel obtained after the converter is tapped is measured to be 0.10%, the content of FeO in the converter slag is 11.2%, and the basicity of the slag is 3.0. Shake the furnace to the ironing position so that the angle between the furnace mouth of the converter and the ground is 40°. Use a hopper to add 0.8t of raw dolomite with a particle size of 45mm and 1t of limestone into the furnace. When feeding, shake the furnace while feeding to make the supplement Furnace material and slag are mixed, and evenly spread on the defect of about 2 square meters in the furnace lining. The temperature of the converter slag makes the standing sintering process proceed at 1590 ° C, standing for 7 minutes, and then shaking the furnace to the blowing position for slag splashing treatment 2.5 min.

Embodiment 3

[0045] After the converter is tapped, the slag splashing treatment is not carried out, the carbon content of the converter tapped steel is determined to be 0.12%, the FeO content in the converter slag is 10.8%, and the slag basicity is 2.7. Shake the furnace to the iron mixing position. The angle between the furnace mouth and the ground is required to be 45°. Use the hopper to add 0.7t of raw dolomite with a particle size of 50mm and 1.2t of limestone into the furnace. When feeding, shake the furnace while feeding. Fully mix the filling material and slag, and evenly spread it on the 1.5 square meter defect formed on the furnace lining. The temperature of the converter slag is such that the standing sintering process is carried out at 1600 ° C, standing for 6 minutes, and then shaking the furnace until blowing Splash slag for 2 minutes.

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Abstract

The invention provides a maintaining method for a converter lining. After tapping of a converter, slag splashing treatment is not conducted, the flaw position of the converter lining is filled with a mending agent, and standing sintering is conducted. The mending agent comprises filler and slag. The filler comprises raw dolomite and lime stone, wherein the mass ratio of the raw dolomite to the lime stone is 4:(7-1). According to the provided method, after tapping of the converter, slag splashing treatment is not needed, the slag and the filler with the limited mass proportion relationship are mixed, the flaw position of the converter lining is filled in a targeted manner, standing sintering is directly conduced, and accordingly maintaining of the converter lining can be finished. The maintaining process is simple, the consumed time is short, and maintaining of the converter lining can be finished in 5-8 min.

Description

technical field [0001] The invention belongs to the technical field of converter steelmaking, and in particular relates to a method for maintaining the lining of a converter. Background technique [0002] The converter lining is made of refractory materials and consists of a permanent layer, a filling layer and a working layer. During the blowing process of the converter, extremely complex and intense physical and chemical reactions and mechanical movements are carried out. Affected by high temperature and harsh conditions, the lining of the converter is easily damaged during use. The main factors are: Mechanical wear, chemical corrosion of the furnace lining by slag and furnace gas, and damage to the furnace lining due to changes in temperature difference in the furnace during water stop and tapping. In the production of converter steelmaking, reducing the damage to the converter lining and increasing the service life of the converter lining are of great significance for i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/44
CPCC21C5/441
Inventor 徐灯亮侯永清张松杨守安邰军凯
Owner QIANAN CITY JIUJIANG WIRE
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