What kinds of firebricks can be divided into

Firebrick as the name suggests is a kind of high temperature resistant brick, can also be called fire brick, has a certain shape and size of refractory materials, according to the preparation process can be divided into fired brick, not fired brick, electric melting brick, refractory heat insulation brick; According to the shape and size, it can be divided into standard bricks, ordinary bricks and special bricks.
According to the different composition of firebricks, it can be divided into five categories: silica-aluminum series firebricks, alkaline series firebricks, carbon-containing firebricks, zirconia-containing firebricks, and heat-insulating firebricks.
First, silicon aluminum series firebrick, including the following:
1, high aluminum refractory brick, with high bauxite clinker as the main raw material, soft clay and waste pulp paper liquid as the binder, multistage particle ratio of mud, high pressure molding, drying, high temperature firing, Al2O3 content of more than 75% neutral refractory material. According to the Al2O3 content, high-aluminum bricks can be divided into four grades: super high-aluminum bricks, first-grade high-aluminum bricks, second-grade high-aluminum bricks and third-grade high-aluminum bricks. Super high aluminum brick is Al2O3 not less than 80%, the first high aluminum brick is Al2O3 not less than 75%, the second high aluminum brick is Al2O3 not less than 65%, the third high aluminum brick is Al2O3 not less than 55%. High aluminum bricks are widely used in iron and steel industry, non-ferrous metal industry and other industries.
2, clay bricks, clay clinker as aggregate, refractory clay as a binder made of Al2O3 content of 30-48% refractory products. Usually with hard clay as the main raw material, pre-calcined mature material, and then with soft clay, semi-dry or plastic molding, the temperature is 1300-1400°C fired into clay brick products, it is a blast furnace, hot blast furnace, heating furnace, power boiler, lime kiln, rotary kiln, ceramic kiln commonly used in the refractory brick.
3, silicon brick, refers to the firebrick containing SiO₂ content of more than 93%, is the main variety of acid firebrick. It is mainly used for masonry coke ovens, but also for various glass, ceramic, carbon calciners, and in the high-temperature bearing parts of hot blast furnaces, but it is not suitable for thermal equipment below 600°C and with large temperature fluctuations.
4, corundum refractory brick, refers to the Al2O3 content is not less than 90%, corundum as the main phase of a refractory brick, divided into sintered corundum brick and fused corundum brick
Second, alkaline series refractory bricks, refers to alkaline oxide and MgO and CaO as the main components of refractory products, the main varieties are:
1. Magnesian firebrick refers to firebrick with magnesite as raw material, square magnesite as the main crystalline phase, and MgO content of 80-85% or more. Magnesia refractory brick is the main product of alkaline refractory brick, high refractories, good resistance to alkaline slag and iron slag, mainly used in open hearth furnace, oxygen converter, electric furnace and superior metal smelting.
2, dolomite brick, is a kind of alkaline refractory brick produced by dolomite as the main raw material, widely used in alkaline converter, can also be used as the lining of some furnace refining package.
3. Magnesium olivine firebrick is a kind of firebrick with magnesium olivine MgO-SiO₂ as the main component. It is mainly used for regenerative lattice bricks in open-hearth furnace, ingot brick, furnace bottom of heating furnace and copper smelting furnace.
3. Carbon-containing firebricks are made of carbon or carbon compounds and are divided into:
1. Carbon brick is a high temperature neutral refractory product made of carbon material as the main raw material and adding an appropriate amount of binder. Carbon bricks are widely used in laying the bottom, hearth, belly and bottom of blast furnace.
2, graphite refractory products, natural graphite as raw materials, with clay as a bond made of refractory materials. The main products of this kind are graphite clay crucible, plug brick for casting steel, water brick and steel drum lining brick
3, silicon carbide refractory products, silicon carbide SiC as raw material production of advanced refractory materials, its wear resistance and corrosion resistance is good, high temperature strength, high thermal conductivity, linear expansion coefficient is small, good thermal shock resistance, in iron and steel smelting, it can be used for steel barrel lining, water plug head, blast furnace bottom.
Fourth, zirconium refractory brick, belongs to a kind of acid material, is made of natural zircon sand as raw materials, zirconium refractory brick has good slag resistance, small thermal expansion rate, high softening temperature under load, high wear resistance, good thermal shock resistance
1, zircon brick, slag, molten steel erosion and thermal shock resistance is good, used as stainless steel cask lining, continuous casting cask lining, cast brick, sleeve brick and high temperature induction furnace lining.
2, AZS fused brick, also known as fused corundum brick, has become a key part of the glass kiln important refractory material, it is resistant to the erosion of glass liquid.
3, zirconium mullite fused brick, characterized by dense crystal structure, high softening temperature under load, good thermal shock resistance, high mechanical strength at room temperature and high temperature, good wear resistance, good thermal conductivity, with excellent resistance to slag erosion ability, used in metallurgical heating furnace, soaking furnace, calcium carbide furnace outlet.
Fifth, heat insulation refractory bricks, also known as light refractory materials, refers to high porosity, low volume density, low thermal conductivity of refractory materials, can be divided into:
1, high aluminum heat insulation light firebrick, is a bauxite content of not less than 48% of the heat insulation brick, can be used for masonry insulation layer and no strong high-temperature molten material erosion and erosion of the part, the contact temperature shall not be higher than 1350°C.
2, Mullite thermal insulation refractory brick, with high quality bauxite clinker as the main raw material, foam or chemical method to form a porous structure, ingredients and water mixed into plastic mud or mud, to extrude molding after high temperature fired high-quality thermal insulation brick. Can directly contact the flame, with high temperature resistance, high strength, good energy saving effect, used in pyrolysis furnace, hot blast furnace, ceramic roller kiln and various resistance furnace lining.
3, clay heat insulation refractory brick, is made of refractory clay as the main raw material of refractory refractory brick, with refractory clay, drift beads and other additives and sawdust, by batching, mixing molding, drying, burning to produce refractory products.
4, bleached bead brick is the main raw material made of heat insulation refractory products. Floating beads are hollow aluminum silicate glass spheres flotation from fly ash of thermal power plant. Bleached bead brick can be formed by semi-dry method.
5, alumina hollow ball brick, based on alumina hollow ball and aluminum oxide powder as the main raw materials, combined with other bonding agents, after 1750℃ high temperature firing, the highest use temperature of 1800℃, the product mechanical strength is high, several times the general light products. It has been widely used in high temperature and ultra-high temperature kilns such as gasifier in petrochemical industry, carbon black industrial reactor and induction furnace in metallurgical industry, and has achieved very satisfactory energy-saving effect. Alumina hollow ball refractoriness can reach more than 1750℃, good thermal stability, reburning line change rate is small, durable, strong thermal insulation characteristics, low thermal conductivity.