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Characteristics and uses of light insulation bricks

July 09, 2021

Light insulation brick is to point to the finalize the design of refractory brick products for porous structure inside, bulky density is small, porosity is high, sex of heat insulation high temperature is excellent, also can call light firebrick or brick of light heat preservation. Use raw material according to material material is different, divide for a variety of, if be made with clay, silicon qualitative and high alumina etc. raw material is called light clay brick, light silicon brick and light high alumina brick. The composition characteristics, use temperature and use of light insulation brick are as follows:


Light clay insulation brick: refers to the aluminum content of 30%-46% light firebrick, with clay clinker or light clinker and plastic clay as the main raw material, using combustible method production. The bulk density is 0.75-1.20g/cm3, the compressive strength is 2.0-5.9MPa, the thermal conductivity is 0.221-0.442W (m.k), the service temperature is 1200-1400℃, used for various industrial furnaces do not contact the melt and no corrosive gas action of the heat insulation layer material.


Light high aluminum insulation brick: refers to the content of Al2O3 in more than 46% of light firebrick. The brick made of natural high alumina clinker is called ordinary light high alumina brick. Light corundum brick is made of fused alumina and its main crystal phase is corundum. Lightweight high aluminum bricks are usually produced by the foam method, with a volume density of 0.4-1.35g/cm3, a porosity of 66%-75%, a compressive strength of 1.3-8.1MPa, and a thermal conductivity of 0.291-0.582W (m.k). Ordinary light high aluminum brick using temperature of 1350-1500℃, suitable for hydrogen, CO and other gases as the protective atmosphere of the kiln. Lightweight corundum brick can be used as furnace lining with the temperature reaching 1650-1800℃, which can directly contact the flame, but it should not be eroded by slag.


Mullite light insulation brick: refers to the Al2O3 content of 50%-85% light firebrick, with mullite as the main crystalline phase and the combination of high quality insulation materials. The main characteristics are: high strength of high temperature structure, low creep at high temperature, small thermal expansion coefficient, strong floc resistance, excellent thermal shock resistance. According to the different aluminum content and volume density, the use of temperature of 1350-1700℃, can directly contact the flame furnace working layer lining.

Silica thermal insulation refractory brick: refers to the thermal insulation silicon refractory brick with SiO2 content above 90% and volume density less than 1.2g/cm3. The volume density is 0.9-1.1g/cm3, the compressive strength is 2.0-5.9MPa, the thermal conductivity is 0.35-0.42W (M. K), and the operating temperature is 1200-1500℃. It is suitable for use in high temperature kiln without contact with molten slag, such as heat insulation material lining of high temperature hot blast furnace of large blast furnace and heat insulation material of glass kiln brick masonry.


Calcium feldspar light heat insulation brick: mainly divided into two kinds, one kind is made of calcium feldspar as main raw material, another kind is based on calcium feldspar combined with light mullite brick (need to add kyanite raw material) his characteristic is small volume density, small thermal conductivity, good thermal shock resistance, the effect of anti-reducing atmosphere is strong. The operating temperature is 1100-1300℃. It is suitable for heat insulation lining of hot blast furnace, soaking furnace and heating furnace in iron and steel industry, and heat insulation lining of various catalytic cracking furnace in petroleum industry.


In addition to the above commonly used lightweight firebrick, there are also applicable to the alkaline erosion of lightweight firebrick, such as magnesium thermal insulation brick, magnesia thermal insulation brick, chromium magnesium thermal insulation brick, zirconia thermal insulation brick, silicon carbide light thermal insulation brick, etc. CH Refractories can supply you with reliable insulating bricks, if you have any need please contact us!




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