High-corrosion-resistance and low-expansion magnesia carbon brick and preparation method thereof

Abstract

The invention discloses a high-corrosion-resistance and low-expansion magnesia carbon brick and a preparation method thereof. The high-corrosion-resistance and low-expansion magnesia carbon brick comprises the following raw materials in parts by mass: 60-75 parts of coated magnesia particles, 5-15 parts of fine magnesia powder, 8-18 parts of crystalline flake graphite, 1-4 parts of an antioxidant and 2-5 parts of phenolic resin. The coated magnesia particles comprise the following raw materials in parts by mass: 3-9 parts of active Al2O3 micro powder, 2-4 parts of active MgO micro powder, 0.5-2 parts of active CaO micro powder, 3-7 parts of asphalt powder and 80-95 parts of magnesia particles. The preparation method of the coated magnesia particles comprises the steps of: well mixing the raw materials of the coated magnesia particles in a mixing mill in a hot state at 150-300 DEG C, and cooling to obtain the coated magnesia particles. The preparation method of the high-corrosion-resistance and low-expansion magnesia carbon brick comprises the steps of: well mixing the raw materials of the high-corrosion-resistance and low-expansion magnesia carbon brick, pressing the mixture into a green body, and baking the green body at 150-220 DEG C for 6-12 hours to obtain the high-corrosion-resistance and low-expansion magnesia carbon brick.

Description

Technical field [0001] The present invention relates to the technical field of refining steel refractory materials, and more particularly to high inhibiting low expansion magnesium carbon tiles and methods of preparation thereof. Background technique [0002] The steel bag is an important thermal equipment in the metallurgical industry. The most primitive and most basic function is to promote, transport and cast steel. With the rapid development and technical advancement of the metallurgical industry, the requirements of steel quality and performance in various industries are also increasing, and the steel water should generally carry out the second refining of the furnace before the casting, mainly including dethinated, degassing, removal In inclusions, adjust the components and temperature of the steel, the main steelmaking process involved is LF, RH, RH + OB, VD, VOD, LATS, etc. The above-mentioned refining process is basically completed in the steel bag so that the steel bag ...

AI Technical Summary

Problems solved by technology

[0005] 1) Oxidation and thermal spalling problems during baking and use: Although increasing the content of metal antioxidants such as Al, Si, etc. can effectively alleviate the problem of oxidative spalling, the above-mentioned additives will react and expand inside the material, causing thermal spalling of the material The problem

At the same time, the addition of the above antioxidants will reduce the slag erosion resistance of the material to some extent

[0006] 2) It is easy to produce "cracks" and "bun-shaped" melting losses during use: due to the high thermal expansion rate of magnesia-carbon bricks at high temperatures, "vertical seams" are prone to occur, and the thermal stress between bricks at the brick joints is relatively high. Large, under the erosion of molten steel and slag, it will preferentially become the channel of damage, which will eventually lead to the problem of "steamed bun-shaped" melting loss

Images