Magnesia material for repairing converter lining, and preparation method and using method thereof

Abstract

The invention relates to a magnesia material for repairing a converter lining, and a preparation method and a using method thereof. According to the magnesia material, magnesia is taken as a main rawmaterial, silica fume is taken as a binding agent, at least one magnesium oxide micro powder, calcined alumina micro powder, silicon carbide micro powder, zirconium oxide micro powder and titanium dioxide micro powder is taken as an additive, at least one of hydroxypropyl methyl cellulose and carboxymethylcellulose is taken as a bleeding prevention agent, at least one of boric acid, citric acid, tartaric acid and oxalic acid is taken as a retarder, at least one of metal aluminum powder and organic anti-explosion fiber is taken as an anti-burst agent, water is taken as a medium, and the magnesia material is prepared after uniform mixing. The magnesia material is an environmentally-friendly magnesia material which is rapid in sintering and long in service life, and has the advantages of environmental protection, no pollution, high mobility, short sintering time and the like.

Description

technical field [0001] The invention relates to the technical field of refractory materials, in particular to a magnesia material for repairing the lining of a converter and its preparation and use methods. Background technique [0002] The converter is the main equipment for steelmaking production. Since the converter lining works at high temperature for a long time and is subject to mechanical impact and slag erosion, the furnace bottom and the magnesia carbon bricks on the front and rear surfaces are easily damaged. In order to increase the life of the converter lining and reduce the cost of steelmaking, the methods of slag splashing and large-scale hot repair are usually used to maintain the converter lining. [0003] Converter slag splash protection is to add light-burned magnesium balls or magnesium carbon balls and other modifiers after tapping, and make the slag and modifiers adhere to the inner wall of the converter by blowing nitrogen and splashing slag, thereby in...

AI Technical Summary

Problems solved by technology

[0003] Converter slag splash protection is to add light-burned magnesium balls or magnesium carbon balls and other modifiers after tapping, and make the slag and modifiers adhere to the inner wall of the converter by blowing nitrogen and splashing slag, thereby increasing the furnace wall. The thickness reaches the effect of maintaining the furnace lining, but this method has two disadvantages: one is that the service life of the furnace lining is short after repair (generally only 1 furnace), so the maintenance frequency is high and the material consumption is large; the other is that it is only suitable for large areas. Permanent repair, can not repair the pit or groove with serious melting loss alone

However, this material will produce a large amount of harmful smoke and dust at high temperature, resulting in environmental pollution; in addition, the sintering time of the asphalt-bonded repair material is too long

This not only affects the rhythm of converter steelmaking, but also reduces the utilization rate of converter

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