Fire Clay, high alumina and basic bricks
The oxides of silicon and aluminum form the basis of fire clay and high alumina bricks.
Fireclay Clay Bricks
The composition of fireclay bricks are in the SiO2-Al2O3 system, with 5-80% SiO2 and between 20-45% Al2O3. Höganäs Borgestad’s vast experience ensures top performance and quality. For areas of application please look into the process.
High Alumina Bricks
According to the description above of fireclay bricks, the High Alumina Bricks belong to the SiO2-Al2O3 system.
The definition of High Alumina is that it has a Al2O3 content above 45%. The higher alumina content normally gives better refractoriness at higher temperatures in comparison with Fireclay Bricks.
Magnesite (or Basic Bricks) is based on magnesium oxide (MgO) and calcium oxide (CaO). The designation magnesia or magnesite brick, is used for bricks with MgO content above 80%.
Generally, basic materials offers very great high-temperature properties, along with good resistance to basic slags, making the material very useful as refractory for the steel, iron and cement industry.
For cement, different brick composition will offer different properties in the hotter part of the rotary kiln. Höganäs Borgestad has long experience and proven products enabling secure and stable operation of the kilns different zones, taking into consideration properties of fuel and raw material input.
Cement and Mortar
Cement or mortar is often used to join bricks. Cements harden at room temperature, while mortars normally require a temperature of at least 300 degrees before they are properly cured.