Environment-friendly aqueous long-life self-flowing repairing mix for converter and preparation method thereof

Abstract

The invention relates to environment-friendly aqueous long-life self-flowing repairing mix for a converter and a preparation method thereof. The invention is characterized by utilizing high purity fused magnesia, high purity sintered magnesia and fine silica powder as the main raw materials; utilizing one or more of ferrosilicon powder, silicon carbide powder, fine metal powder and the like as the burning accelerating agent to realize rapid sintering of the self-flowing repairing mix; utilizing one or two of citric acid, boric acid, tartaric acid, oxalic acid and the like as the retarders to realize the construction time of the self-flowing repairing mix; and utilizing fine MgO and SiO2 powder, thus improving the mobility and the sintering property of the material, enhancing the medium and high temperature strength and boosting the washing resistance and the impact resistance of the material. The self-flowing repairing mix has high hot strength and excellent erosion resistance and liquid steel washing resistance and can be continuously used for 50h after once repairing under the condition of smelting multi-variety steel in the converter, thus greatly improving the efficiency of converter steelmaking, reducing the consumption of refractories and prolonging the lives of the lining materials of the converter.

Description

technical field [0001] The invention relates to an environment-friendly (water system) long-life self-flowing repair material for converters and its preparation method. Specifically, on the one hand, it is to realize green steelmaking, and on the other hand, it is to meet the requirements of fast-paced and low-consumption converter steelmaking. A new environment-friendly long-life converter self-flowing repair material is provided. It belongs to the field of refractory materials. Background technique [0002] Converter steelmaking is the main equipment for steelmaking production. Due to the long-term mechanical impact and slag erosion of the converter at high temperature, the refractory materials on the bottom of the furnace and the large front and rear surfaces are easily damaged. In order to increase the life of the converter and reduce the cost of steelmaking, the lining of the converter is usually maintained. The current maintenance methods are converter slag splashing...

AI Technical Summary

Problems solved by technology

Converter slag splashing is to add light-burned magnesium balls or magnesium carbon balls and other modifiers after tapping to make the slag and modifiers adhere to the inner wall of the converter by blowing nitrogen and splashing slag, so as to increase the thickness of the furnace wall to achieve maintenance. effect, but this method has two disadvantages: the service life after the first repair is short (generally only 1 furnace), the maintenance frequency is high, and the material consumption is large; the second repair area is large, and it cannot be used for the serious melting Pit or groove repaired individually

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 the converter steelmaking, but also reduces the utilization rate of the converter

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