Semi Silica Bricks

Semi silica bricks refer to aluminum-silicon refractory products with a content of more than 65% and a content of 15% to 30%. Semi-silica bricks generally use clay containing quartz impurities or native kaolin, refractory clay or tailings and pyrophyllite obtained from kaolin mineral processing as raw materials. The refractory degree of semi-silica fire brick is about SK27 (1610℃), 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.

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Moderate Thermal Conductivity: Semi Silica Brick provides reliable thermal resistance, making it suitable for applications where extreme temperatures are not the primary concern.
Cost-Effective Construction: Its composition allows for a more cost-effective manufacturing process, providing a budget-friendly alternative without compromising essential refractory qualities.
Mechanical Strength: The brick's inherent strength ensures durability in environments with moderate mechanical stress, contributing to extended service life.

The production process of semi silica bricks can be divided into two types: fired or unfired. Unfired bricks are mostly made of water glass as a binding agent. The production process of fired bricks is roughly the same as that of pasted products, but it also has its own characteristics, mainly reflected in:
(1) Whether to add clinker is determined by the characteristics of the raw materials and the use requirements of the products. Siliceous clay has small shrinkage during firing and can be used without adding clinker. To improve the thermal shock resistance of semi-silica bricks, 10% to 20% clinker should be added.
(2) If there are few fusible substances and coarse quartz particles in the raw material, the semi-silica brick will have low density and poor strength, but good thermal shock resistance and high load softening temperature; otherwise, the product will have poor fire resistance and thermal shock resistance. reduce. Therefore, when adding quartz sand or silica clinker, it should be decided according to the use conditions of the product whether to increase the particle size material or add fine particle material.
(3) The volume shrinkage of semi-silica bricks is not obvious below 1250°C. At high temperatures, the volume shrinks greatly as the liquid phase increases. Therefore, its firing temperature should be higher than that of clay bricks, generally in the range of 1350-1410°C. Obtain high-density products.
(4) When using pyrophyllite as the raw material for semi silica bricks, the process should be determined based on the chemical composition of the pyrophyllite raw material. Pyrophyllite, the main component of pyrophyllite, loses little weight after dehydration and still maintains its lattice structure. Therefore, bricks can be made directly from raw materials, and mineral resources can also be fully utilized to reduce production costs. In order to prevent expansion and strength reduction during firing, the wax stone raw material can also be calcined into clinker, and a small portion can be added during batching. It should also be noted that wax stone has poor water absorption, so the moisture content of the mud should be strictly controlled, otherwise cracks in the finished product will occur during molding.

Semi silica bricks are mainly used as the refractory layer of ladle linings and cast steel systems. 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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