A kind of unfired alumina-magnesia-carbon brick and preparation method thereof

Abstract

The invention belongs to the technical fields of advanced fireproof materials for electric furnaces, converter linings and steel ladle linings and preparation thereof, and relates to an unfired alumina-magnesite carbon brick and a preparation method thereof. The unfired alumina-magnesite carbon brick is prepared from aggregate, powder, an additive and a binding agent in parts by weight: 60 to 70 parts of brown aluminum oxide and / or special alumina; 1 to 3 parts of magnesium aluminate spinel, 9 to 11 parts of high-purity magnesia, and 11 to 13 parts of sub-white corundum; 2 to 4 parts of the additive; 5 to 7 parts of graphite, 1 to 3 parts of high-temperature pitch, 0.2 to 0.5 part of rare earth oxide, 3 to 5 parts of a ceramic binding agent, 3 to 4 parts of a complexing magnalium grouting agent and 1 to 3 parts of water. The unfired alumina-magnesite carbon brick has the advantages that the preparation method is simple and safe, the cost is low, high-temperature firing is not needed, the density is large and the strength is high.

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 their preparation, and in particular relates to a non-fired alumina-magnesia-carbon brick and a preparation method thereof. Background technique [0002] Aluminum magnesia carbon brick is based on Al 2 o 3 , MgO and C as the main components of carbon-containing refractories, containing Al2O360% ~ 69%, MgO7% ~ 14%, C5% ~ 12%. It has good slag erosion resistance and thermal shock resistance, and has a small amount of reburning expansion. It is mainly used for electric furnace, converter lining and ladle lining. Although the existing alumina-magnesia-carbon bricks meet certain requirements for use, there are still 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 long service life has alw...

AI Technical Summary

Problems solved by technology

[0003] At present, in order to reduce smog and protect the environment, in the preparation method of alumina-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, and the cost of natural gas required for firing per ton of bricks About 600-800 yuan, the cost of the product 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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