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Semi-Silica Brick

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Semi-Silica Brick

Category：

Refractory Fire Brick

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Semi-Silica Brick Details

Semi-silica brick refers to an aluminum-silicon refractory product with a SiO2 content of greater than 65% and an Al2O3 content of 15% to 30%. They generally use clay containing quartz impurities or native kaolin, refractory clay or tailings and pyrophyllite obtained from kaolin mineral processing as raw materials. Pyrophyllite is often used in countries around the world to make semi-silica bricks.

The refractory degree of semi-silica brick is about SK27 (~1610°C), and it is the most general refractory material in terms of composition. Its characteristics include low price, small volume change at high temperatures, and good resistance to rapid cooling and heating. In the past, semi-silica bricks were used in gas generators and coke ovens where furnaces expand and contract due to repeated heating and cooling.

Features

1. Cost-Effective:Semi-silica bricks are generally more cost-effective compared to high-alumina or silica bricks, making them a preferred choice in certain applications where cost is a significant factor.

2.Thermal Shock Resistance:Semi-silica bricks exhibit moderate resistance to thermal shock, allowing them to withstand rapid temperature changes to a certain extent.

3.Versatility:They can be used in a variety of industrial settings, such as furnaces, kilns, and other high-temperature environments.

Semi-silica Bricks

Physical And Chemical Indicator

Brand Properties		Semi-silica bricks
Bulk Density(g/cm3)		1.80~1.95
Cold Crushing Strength(MPa)		≥25
Apparent Porosity(%)		20~28
Thermal Shock Stability(1100℃ water cooling)(Times)		≥30
Chemical Analysis(%)	SiO2	77~81
	Al2O3	14~18
	Fe2O3	1.2

Application

Semi-silica bricks are widely used in coke ovens, acidified iron furnaces, metallurgical furnace flues, ladle linings, flowing steel bricks and hot metal tanks, etc.

$refractory Semi-silica Bricks$

It is mainly used as a refractory layer for ladle linings and pouring steel systems. In addition, it can also be used in hot furnace tops, regenerator checker bricks, iron furnace linings, various kiln bottoms and flues, etc.

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