Magnesia carbon brick for vicinity of furnace door of electric arc furnace and preparation method of magnesia carbon brick

Abstract

The invention relates to a magnesia carbon brick for the vicinity of the furnace door of an electric arc furnace and a preparation method of the magnesia carbon brick. The prepared magnesia carbon brick is prepared from the following raw materials in parts by weight: 20-30 parts of fused magnesia of which the granularity is more than or equal to 3mm and less than 5mm, 20-40 parts of fused magnesiaof which the granularity is more than or equal to 1mm and less than 3mm, 10-20 parts of fused magnesia of which the granularity is more than or equal to 0.1 mm, 5-20 parts of fused magnesia powder ofwhich the granularity is smaller than 0.088 mm, and 12-16 parts of flake graphite, 1-3 parts of phenolic resin binder, and 1-6 parts of additive; the content of magnesium oxide in the fused magnesiteis greater than or equal to 97.5 wt%, and the volume density of the fused magnesite is greater than 3.45 g / cm <3>. According to the magnesia carbon brick for the vicinity of the furnace door of an electric arc furnace and a preparation method of the magnesia carbon brick of the invention, the phenolic resin binder is used; the phenolic resin binder is utilized to prepare the fused magnesite and flake graphite with different particle sizes under the action of the additive, so that the magnesia carbon brick has the advantages of good heat-conducting property, low thermal expansion coefficient,high tensile strength, good toughness, oxidation resistance and scour resistance.

Description

technical field [0001] The invention relates to the technical field of magnesia-carbon brick processing, in particular to a magnesia-carbon brick used near an electric furnace door and a preparation method thereof. Background technique [0002] With the development of the economy, the amount of scrap steel resources in my country has gradually increased. The supply of scrap steel shows a strong growth trend, and the reuse of scrap steel resources has received great attention. In recent years, the country has advocated the vigorous development of electric furnace steelmaking, and the current steelmaking electric furnace is developing in the direction of large-scale, ultra-high power and automatic control. With the development of electric furnace steelmaking technology, higher requirements must be put forward for the refractory materials used. The magnesia-carbon bricks used near the electric furnace door must not only bear the radiation of high-temperature arc light, but als...

AI Technical Summary

Problems solved by technology

With the development of electric furnace steelmaking technology, higher requirements must be put forward for the refractory materials used. The magnesia-carbon bricks used near the electric furnace door must not only bear the radiation of high-temperature arc light, but also withstand the high-temperature molten steel and slag during the smelting process. Penetration erosion, erosion and wear, as well as rapid cooling and rapid heating, the service conditions are very harsh, and this part is not easy to be sprayed at the same time, so it often becomes the weak link of the entire furnace operation, resulting in frequent offline replacement of the electric furnace during use, not only It affects the production rhythm, buryes hidden dangers for safety, increases the cost per ton of steel, and has become a restrictive link in the development of variety steel

[0003] The performance of magnesia-carbon bricks produced by traditional technology is relatively poor. Using them near the electric furnace door will lead to the following problems:

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