What is the main material of lightweight insulation bricks? What are the unique physical and chemical properties of these materials?
Publish Time: 2024-05-06
The main materials of lightweight insulation bricks include graphite, perlite, dolomite and silica sand. Each of these materials has unique physical and chemical properties. Here is a brief introduction to these materials and their properties:
Graphite:Physical properties: Graphite is an allotrope of carbon with a layered structure and has high thermal stability and electrical conductivity. In lightweight insulation bricks, graphite is mainly used to improve the insulation performance of the bricks.Chemical properties: The chemical properties of graphite are very stable and can resist the erosion of acids, alkalis and organic solvents.Perlite:Physical Properties: Perlite is a porous volcanic rock with high porosity and low bulk density. In lightweight insulation bricks, perlite is used as a skeleton material to maintain a certain strength of the bricks while ensuring their lightness.Chemical properties: The chemical properties of perlite are relatively stable, but may be attacked by some acidic and alkaline solutions.Dolomite:Physical Properties: Dolomite is a carbonate mineral composed primarily of calcium and magnesium carbonate. Its special structure can provide a certain strength for lightweight insulation bricks.Chemical Properties: Dolomite is resistant to attack by most acids and bases, but may react in strong acid or base environments.Silica sand:Physical properties: Silica sand is a natural mineral with high silicon content, mainly used to enhance the fire resistance of lightweight insulation bricks.Chemical properties: Silica sand has high chemical stability and can resist the attack of most acids and alkalis.The proportion of these materials in lightweight insulation bricks is mainly determined by the process and product performance requirements. Generally, the content of perlite and dolomite is 50% to 70%, the content of graphite is 20% to 30%, and the content of silica sand is 5% to 15%. The combination of these materials makes the lightweight insulation bricks have the characteristics of high porosity, low volume density, and good thermal insulation properties. They are widely used as thermal insulation filling materials in the space between the refractory bricks and the ketone body inside various industrial kilns.
