What factors will affect refractory bricks during the firing process?

1. Vapor deposition

In many smelting furnaces and flame furnaces, the decomposition of carbon monoxide and the volatilization of lead, zinc, and alkali metal oxides will occur during the production process, and they will be deposited in the pores and the joints of the refractory bricks, which will cause the brickwork to crack and deform. And chemical erosion, this phenomenon is more prominent in the upper part of blast furnace, blast furnace, shaft kiln and coke oven, and even becomes the main cause of these parts.

2. Influence of drastic changes in temperature

Many kilns, especially those operating intermittently, have large temperature fluctuations, and sudden temperature changes will generate large internal stress, which will lead to cracking and cracking of refractory brick masonry, spalling, deforming or collapsing in severe cases. Such as steelmaking converter, electric arc furnace, copper and tin smelting reverberatory furnace, etc. During smelting, the furnace temperature can reach 1250-1650℃, but after the slag, steel and copper tapping, the temperature in the furnace drops sharply to 600-800℃. If the temperature is too fast or fluctuates too much in a short time, it will cause the brick body to be stressed and cracked. , peeling, damage.

3. Slag corrosion

Corrosion caused by the physicochemical interaction of molten slag with molten metal or corrosive gas containing dust.

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