Mechanically-pressed carbon-free corundum spinel ladle brick as well as preparation method thereof

Abstract

The invention discloses a mechanically-pressed carbon-free corundum spinel ladle brick. The mechanically-pressed carbon-free corundum spinel ladle brick comprises the following components in percentage by weight: 30%-50% of plate-shaped corundum particles, 10%-20% of high-purity aluminum-rich spinel particles, 10%-20% of plate-shaped corundum fine powder, 1%-9% of large crystallized magnesia fine powder, 5%-15% of high-purity aluminum-rich spinel fine powder, 1%-10% of high-purity silicon micro powder, 2%-10% of imported multimodal alpha-Al2O3 micro powder, 1%-4% of metal silicon and a bonding agent which is composed of 1%-5% of polyphosphate and 1%-3% of polysaccharide. The mechanically-pressed carbon-free corundum spinel ladle brick disclosed by the invention adopts an organic-inorganic compound combining system, is wet-milled and mixed under high pressure, formed under high pressure, high in density, good in thermal stability under high temperature, and resistant to molten steel and slag, and does not pollute the molten steel; moreover, production efficiency can be greatly improved, and therefore, the mechanically-pressed carbon-free corundum spinel ladle brick can be extensively applied to various ladles, especially refined low-carbon steel and ultralow-carbon ladles.

Description

technical field [0001] The invention relates to a refractory material, in particular to a machine-pressed carbon-free corundum spinel ladle lining brick and a preparation method thereof. Background technique [0002] Around the 1980s, carbon-containing refractory materials were used with great success in the lining of steel smelting furnaces. Carbon-containing products have good resistance to slag penetration and erosion, so currently ladles mostly use different grades of unfired magnesia-carbon bricks and magnesia-alumina-carbon bricks. Carbon-containing refractories have played an important role in the steelmaking process for decades. However, with the rapid development of the national economy, the market demand for high-quality, special steel and other clean steel in industries such as automobiles, home appliances, high-speed rail, and oil pipelines is increasing. my country's iron and steel industry enterprises are also adjusting their products according to changes in m...

AI Technical Summary

Problems solved by technology

The production plan of low-carbon ladle bricks uses phenolic resin as a binder, adds a small amount of graphite, and at the same time adds a large amount of metal antioxidants to ensure that the resin and graphite are not oxidized. In addition, due to the addition of a large amount of metal antioxidants, the production cost is very high. At the same time, the ceramic structure formed after oxidation of the antioxidants has a great impact on the resistance to peeling off during the use of the product. restrictive

The carbon-free ladle bricks currently in use adopt the production process of pouring prefabricated bricks. The solution for pouring prefabricated bricks is to use calcium aluminate cement or micropowder hydration as the bonding system, and vibrate to form after stirring. Only a few pieces can be produced each time. After several hours of curing, the next batch can be produced after demoulding. The production efficiency is low, and combined with the influence of the system by temperature and humidity, the performance of the product fluctuates greatly.

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