Unburned magnesia-carbon brick and preparation method thereof

Abstract

The invention belongs to the technical field of high-duty refractory for electric furnace and converter linings and ladle linings and in particular relates to an unburned magnesia-carbon brick and a preparation method thereof. The unburned magnesia-carbon brick is characterized by comprising the following components in parts by weight: 80-90 parts of fused magnesite (more than or equal to 97% of MgO, the granularity of 0.1-5mm and the moisture content of less than or equal to 4%), 12-16 parts of graphite (more than or equal to 98% of C, the granularity of less than or equal to 400 meshes, and the moisture content of less than or equal to 0.15%), 0.5-1.5 parts of metal aluminum powder (more than or equal to 98% of Al and the granularity of less than or equal to 400 meshes), 1-3 parts of an aluminum magnesium alloy (more than or equal to 98% of Al+Mg and the granularity of less than or equal to 400 meshes), 0.2-0.8 part of boron carbide (more than or equal to 99% of BC4 and the granularity of 200-325 meshes), 1-2.5 parts of high temperature pitch (softening temperature of more than or equal to 150 DEG C, more than or equal to 50% of residual carbon and the granularity of 100-200 meshes), 0.2-0.5 part of a rare earth oxide (the granularity of 300-350 meshes), 3-5 parts of ceramic bond, 3-4 parts of a complex magnesium-aluminum cementing agent and 1-3 parts of water. The unburned magnesia-carbon brick disclosed by the invention has the advantages of simple and safe preparation method, low cost, no need of high-temperature firing, high density, high strength, high corrosion resistance, molten metal resistance, high oxidation resistance, energy conservation and emission reduction and the like.

Description

technical field [0001] The invention belongs to the technical field of high-grade refractory materials for electric furnaces, converter linings and ladle linings, and in particular relates to a non-fired magnesia carbon brick and a preparation method thereof. Background technique [0002] Magnesia carbon brick is a new type of refractory material that emerged in the middle of the 20th century. It is a refractory material made of high-temperature sintered magnesia or fused magnesia and carbon materials and various carbonaceous binders. Due to its high refractoriness, Excellent thermal shock resistance and strong corrosion resistance are widely used in converter steelmaking and electric furnace steelmaking. Although the current magnesia carbon bricks meet certain requirements for use, they still have problems such as high price and short service life. Therefore, how to reduce costs and develop green and environmentally friendly refractory materials with high efficiency and lon...

AI Technical Summary

Problems solved by technology

[0003] At present, in order to reduce smog and protect the environment, in the preparation method of magnesia carbon bricks, natural gas is used instead of fuel oil to provide heat energy during the firing process. Therefore, a large amount of natural gas is required to provide heat energy during the firing process. 600-800 yuan, the product cost is still high, and the burning of natural gas still produces a certain amount of greenhouse gases during the firing process, which will have an impact on the overall greenhouse effect of the earth

Although natural gas is colorless and odorless, when the natural gas accumulates to a certain proportion in a closed environment, it will trigger a powerful explosion. Therefore, there are certain safety hazards in using natural gas to provide heat energy, and the details in the preparation process are relatively rough. , the shape and density of the prepared shaped bricks are insufficient

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