Why Do Glass Melting Furnaces Use The 5 Types of Refractory Bricks?

The main indicators of lightweight refractory materials are: bulk density, porosity, thermal conductivity, service temperature and mechanical strength.

Light Refractory Brick

Light-weight refractory bricks are block-shaped heat-resistant refractory products with thermal insulation properties within the porous structure. Among them, brick-shaped products have the most extensive production and application, so they are also called lightweight Insulated refractory bricks. Light-weight thermal insulation refractory bricks can be divided into clay, silicon, aluminum and mullite according to the raw materials used. Lightweight refractory bricks have low compressive strength, poor slag resistance, and poor thermal shock resistance, and cannot be in direct contact with glass liquid or flame.

Light Clay Thermal Insulation Brick

Lightweight clay insulation bricks are made of refractory clay as the main raw material, with A1203 content of 30% ~ 48%. Its production process uses the burn-in plus character method and the foam method. Its volume and density are 0.3 ~ 1.5g / cm3. Lightweight clay insulation bricks have a wide range of uses. They are mainly used in various industrial kiln refractory materials that do not encounter molten matter and non-erosive gases. The use temperature is 1200 ~ 1400°C.

Light Silicon Thermal Insulation Brick

Light-weight silicon-based thermal insulation bricks are made of silica as the main raw material and the thermal insulation products with a SiO2 content of not less than 91%. The bulk density of lightweight silicon thermal insulation brick is 0.9 ~ 1.1g / cm3, the thermal conductivity is only half that of ordinary silicon brick, and the thermal shock resistance is good. Therefore, the maximum use temperature of silicon thermal insulation brick can reach 1550°C. It does not shrink at high temperatures and even slightly expands.

Lightweight silica refractory bricks have excellent fire resistance. The softening temperature under load is close to that of dense silica bricks reaching above 1620°C. There is only a small amount of residual expansion and their thermal stability is better than that of dense silica bricks. Therefore, the lightweight silicon brick can be used for a long time at 1500 ~ 1550°C under high-temperature conditions without contact with slag.

Lightweight Alumina Insulation Brick

Lightweight alumina insulation bricks are heat-resistant refractory products made of fused alumina, sintered alumina and industrial alumina. Its production process has two methods: foam method and burn-out additive method. The alumina foam brick is produced by the foam method. After the clinker is ground, it is mixed with a binder and a foaming agent to prepare a slurry, which is cast and fired at 1350 ~ 1500°C. The product has high fire resistance and good thermal shock resistance and is often used as a high-temperature insulation layer of a kiln.

Light Mullite Insulation Brick

Light mullite insulation brick is a heat-resistant refractory product made with mullite as the main raw material. Mullite insulation brick is high temperature resistant, high strength, low thermal conductivity, direct contact with flame, suitable for lining of various industrial furnaces.