A kind of ladle breathable brick and preparation method thereof

Abstract

The invention discloses a preparing method of a steel ladle air brick. The method comprises the steps that all raw materials of the steel ladle air brick are mixed uniformly and sequentially subjected to vibrating pressurizing formation, curing and sintering, so that the steel ladle air brick is obtained; the steel ladle air brick is manufactured with, by weight, 60-70 parts of compact sintered alumina particles, 20-30 parts of compact sintered alumina fine powder, 3-10 parts of activated aluminum oxide micro powder, 1-5 parts of magnesium oxide micro powder, 1-6 parts of chromium oxide micro power, 3-8 parts of a sol solution, 0.04-0.08 part of organic fibers and 0.1-0.5 part of an organic modifier. The steel ladle air brick has excellent thermal shock stability, low corrodibility and a high blow-off rate, and is easy to sweep, and the service life is improved greatly.

Description

Technical field [0001] The invention relates to the field of refractories, in particular to a ladle air-permeable brick and a preparation method thereof. Background technique [0002] With the continuous progress of iron and steel smelting technology, especially the increase in the smelting volume of some high value-added steels, the proportion of out-of-furnace refining in the smelting process is increasing. Breathable brick is a key functional refractory material used for refining outside the furnace. It is stirred by blowing argon with the breathable brick, so that the added alloy can be quickly and evenly dissolved in the molten steel. [0003] However, as the smelting temperature increases, the refining ratio increases, and the refining time extends, the use conditions of ventilated bricks become more and more demanding, resulting in increased erosion during use, increased cross-sectional spalling, and shortened service life. The ladle had to be rolled off the assembly line ea...

AI Technical Summary

Problems solved by technology

[0005] 1) Easy to block, break and peel off;

[0006] 2) The brick core is not resistant to burning oxygen, and its resistance to melting loss is not bad;

[0007] 3) Insufficient thermal shock stability, poor adaptability to rapid cooling and rapid heating conditions

[0008] The above-mentioned problems eventually lead to the service life of the air-permeable brick not meeting the requirements, the life of the ladle is limited, and the cost of refractory materials per ton of steel is high

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