Lightweight silica brick is a very special material that has practical potential in only two industrial fields. In most cases, lightweight silica bricks and dense silica bricks are used as the lightweight part of the structural layer. Commonly used is the light weight of the glass kiln, mainly the insulation of the kiln vault, thereby reducing heat loss and increasing the efficiency of the melting process. The second area is used in the steel industry, where lightweight silica bricks are used for the lightness of hot blast stove walls and domes.
1. Lightweight silica bricks are used in the glass industry - thermal insulation of furnace vaults
During the glass melting process, very high temperatures are reached in the raised lower part of the dome. Depending on the type of glass, the temperature is around 1600°C. Lightweight layers are usually designed as two or more layers.
Lightweight silica bricks are mainly exposed to these temperature loads. It is expected that the single layers of the vault (structural and lightweight layers) have the same or similar expansion properties. Silica bricks with a bulk density of 1250kg·m-3 or 1000kg·m-3 can meet the requirements of the dense layer. The next layer uses silica bricks with a bulk density of 800kg·m-3 or 600kg·m-3.
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Lightweight silica bricks can be freely stacked on the furnace arch, or bonded with silica fire clay. There is no chemical load during the furnace service period (several years). Lightweight silica bricks are mainly used because the chemical and mineral composition of the working linings are similar to dense silica bricks.
2. Lightweight silica bricks are used in hot blast stoves
The hot blast stove is often used for hot blast (called blast furnace blast), which is connected with the blast furnace's air extractor. 1 range.
This entails calculating a comparison between a hot blast stove (different component sizes and locations of use) and a glass kiln vault at different levels and loads, focusing on the thermomechanical properties. For lightweight layers, bulk densities of 1250 kg·m-3 or 1050 kg·m-3 are used (mainly due to their higher strength). Similar to dense silica bricks, light silica bricks are also bonded with fire clay (mainly Q94 grade fire clay).
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At the same time, among these components, the lightweight silica bricks must meet the entire cycle life of the hot blast stove (ie, 8 to 12 years).
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