Common lightweight insulation bricks for electric furnace linings

Masonry furnace body, often divided into refractory layer, high-temperature refractory insulation layer, medium-temperature refractory insulation layer and so on. In order to reduce the heat storage of the furnace wall itself and the heat lost through the furnace wall to the outside, in order to shorten the warming time, saving heat energy, often near the furnace lining high-temperature refractory layer near a layer of thermal resistance, both fire-resistant and heat preservation of lightweight refractory materials. Although the bulk density of this material is only 0.4 ~ 1.3g/cm3, but can withstand high temperatures of more than 1200 ℃, is widely used as furnace lining and high-temperature insulation layer materials. But also because of its low bulk density, high porosity, resulting in low mechanical strength, poor wear resistance, chemical corrosion resistance is also poor, the selection should be considered when the high temperature mechanical strength can meet the requirements.

There are three manufacturing methods for lightweight refractory bricks: burning off the addition method (usually adding wood chips), foam method and chemical method. Currently commonly used lightweight refractory bricks are lightweight refractory clay bricks, lightweight refractory silica bricks, lightweight refractory high alumina bricks and so on.

Lightweight refractory clay bricks are fired with clay clinker as the main raw material, bulk density according to the corresponding grades should not be greater than 0.4 ~ 1.3g/cm3, its main performance indicators are shown in table.

Lightweight refractory clay brick is mainly used for heat treatment furnace lining, can also be used for high-temperature insulation materials for the furnace. Its weakness is large porosity, poor abrasion resistance, load softening start temperature is only about 1100 ℃, poor thermal stability, refractoriness and clay brick close.

Lightweight refractory silica bricks are used in the masonry part where the temperature does not exceed 1550℃, and the secondary bricks are used as high-temperature insulation materials. The main performance indicators of lightweight refractory bricks are shown in the table.

Lightweight refractory silica bricks have high load softening temperature (about 1600℃), and residual expansion at high temperature is below 0.2%, widely used in furnace roof and wall parts.

Lightweight refractory high alumina bricks bulk density of 0.4 ~ 1.0g/cm3. Density can be used for direct contact with the flame parts, but should not be used with high gas flow scouring or high-temperature melting parts of contact. Small density for thermal insulation, the use of temperature should not be higher than 1450 ℃, lightweight refractory high alumina brick main performance indicators are shown in the table. Lightweight high alumina bricks are used for masonry all kinds of high temperature kilns, electric furnaces and high temperature insulation materials.

Note: Products PM-1.0 and PM-0.8 can be used in areas where there is no strong erosion or scouring of high-temperature molten materials.

Light alumina bricks from fine powder processing and firing, nature is better than high alumina bricks, commonly used in electric furnaces at high temperatures parts of the thermal insulation materials, the use of the temperature of 1300 ℃, the temperature will be too high shrinkage deformation. Light alumina brick main performance indicators are shown in the table.

With the development of science and technology, some advanced refractory insulation materials continue to appear, such as alumina hollow ball is an example. Alumina refractory hollow ball is used in granular form, can also be added to the appropriate binder molding after masonry. The main performance index of alumina refractory hollow ball brick is shown in the table.

Note: The chemical composition of alumina hollow - sphere brick is 99.76% Al₂O₃, 0.05% Fe₂O₃, and 0.22% SiO₂.

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