1.Classified according to whether they are shaped or not
According to the shape of the products delivered from the factory are divided into shaped products and unshaped products. Where called bricks are stereotyped products. All kinds of castables, furnace filler, pounding material, fire clay, etc. are unshaped products. Shaped products are divided into dense and heat-insulating type, refractory bricks belong to dense products, concrete is a shaped delivery products, but it is an unshaped product.
2. According to the main crystal phase acid, alkali nature classification
(1) acidic material products: these products to quartz (SiO2) for the first phase, SiO2 is an acidic oxide, help and so named. Silica brick is a representative product of acidic materials; half-silica brick, alkali-resistant brick, acid-resistant brick in the SiO2 content of 60% to 80%, is a semi-acidic materials.
(2) alkaline material products: MgO, CaO main crystal phase, because MgO, CaO is alkaline earth oxide, so it is called alkaline refractories. Their high melting point, resistance to alkaline slag (C / S> 2) erosion ability is very strong, belongs to the senior refractory materials, but they are easy to hydrate. Magnesium-chromium bricks, dolomite bricks, olivine bricks and other products, the main Chinese chemical composition is also MgO, CaO also belongs to alkaline materials.
(3) neutral material products: Al2O3, ZrO2 main crystal phase, their chemical behavior is variable, when encountered with alkaline oxides show acidic characteristics, such as the generation of MgO, Al2O3, Al2O3, ZrO2; encountered with strong acidic oxides and alkaline characteristics. Such as the generation of clay bricks, high alumina bricks, mullite bricks are representative of neutral materials. Zircon products are also neutral products.
