Production of composite corundum carbon brick for ladle

Abstract

The invention discloses a production method for composite corundum carbon brick used in ladle; the material ratio of the invention is that high alumina corundum 35-40%, fused magnesia 25-35%, fused alumina-magnesia spinel 10-15%, graphite 6-7%, aluminum powder 1-2%, silicon powder 1-3%, silicon carbide 3-5%, aluminum oxide 3-5%, resin 3.5-3.8%; an the manufacturing process is that stirring - molding and shaping - drying - heating - checking and warehousing. The service life of the composite corundum carbon brick used in ladle produced by the method can be greatly prolonged, the average service life can reach 130 times, and the highest is 146 times, the lowest is 123 times, which is higher than the original service life 60-80 times by one time, thus keeping the high production continuity and bringing forth considerable economic effectiveness.

Description

technical field [0001] The invention relates to the technical field of refractory production, in particular to a production method of composite corundum carbon bricks for ladles. Background technique [0002] Various composite bricks are used for the working lining of the bottom and wall (non-slag line area) of the refining ladle (80-160t) in the smelting furnace of the steelmaking plant. The most important requirement for the composite brick is long life, otherwise it must be replaced frequently The working lining not only affects the continuity of the work, but also causes great economic losses due to maintenance and shutdown. At present, similar domestic ladle products generally have a short service life, with an average of 60-80 furnaces. This is due to the following reasons: 1. The main material of the existing bricks for ladles is relatively cheap. The raw materials contain bauxite and magnesia that affect product performance, resulting in low-grade products; 2. High ...

AI Technical Summary

Problems solved by technology

[0002] Various composite bricks are used for the working lining of the bottom and wall (non-slag line area) of the refining ladle (80-160t) in the smelting furnace of the steelmaking plant. The most important requirement for the composite brick is long life, otherwise it must be replaced frequently The working lining not only affects the continuity of work, but also causes great economic losses due to maintenance and shutdown

At present, similar domestic ladle products generally have a short service life, with an average of 60-80 furnaces. This is due to the following reasons: 1. The main material of the existing bricks for ladles is relatively cheap. The raw materials contain bauxite and magnesia that affect product performance, resulting in low-grade products; 2. High carbon content (about 10%), which affects the thermal conductivity of the product. The higher the carbon content, the faster the thermal conductivity of the product. It is beneficial to the heat preservation of molten steel in the ladle; 3. Process reasons, especially in the mixing process and baking control, have an impact on product performance

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