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Lightweight insulating refractory magnesia alumina brick magnesia brick manufacturers
Alkaline series refractory bricks. Alkaline refractory bricks are refractories with basic oxides such as Mg0 and CaO as the main components. The main varieties are the following.
(a) magnesia brick, refers to the brucite as raw materials, mainly to periclase phase, the content of MgO in 80% to more than 85% of the refractory brick. Its products are divided into two major categories: Metallurgical magnesia and magnesia products. According to the chemical composition and different purposes, Martin sand, ordinary metallurgical magnesia, magnesia brick, magnesia brick, ordinary magnesia brick, magnesia calcium brick, magnesia brick and other varieties. The main products of magnesite brick is alkaline refractory brick, high refractoriness, has good resistance to alkaline slag and iron slag, is a kind of important high refractory brick. Mainly used in open hearth furnace, BOF, EAF and non-ferrous metal smelting etc..
(two) dolomite brick with dolomite as a main raw material for the production of basic refractory brick. It is widely used in alkaline converter and can also be used as a lining for some outside refining ladle.
(three) the magnesia olivine refractory brick is a refractory brick composed mainly of 2MgO SiO2. Mainly used in open hearth furnace regenerator, ingot brick, heating furnace and the smelting furnace has good effect.
Carbon containing refractory bricks. Carbon containing refractory bricks are made of carbon or carbon compounds, with different forms of carbon as the main components of the refractory brick products, mainly divided into the following.
(1) carbon brick is a high temperature neutral refractory brick made from carbonaceous material as the main raw material and a proper amount of binder added. Carbon brick is widely used in the blast furnace bottom and hearth, bosh and lower stack. It can improve the continuous operation time of the blast furnace and prolong the service life. In addition, carbon bricks are also widely used in the electrochemical industry, chemical industry, petrochemical industry, electroplating industry, ferroalloy industrial furnaces (or equipment lining), acid solutions, caustic bath linings and pipelines, as well as melting non-ferrous metals (such as lead, aluminum, tin, etc.).
(two) graphite refractories are refractories made of natural graphite as raw materials and clay as binder. These products include graphite clay crucible, distillation tank, plug brick for cast steel, water mouth brick and steel barrel lining. The most widely used and widely used graphite clay crucible for steelmaking and smelting nonferrous metals is the most widely used.
(three) silicon carbide refractory products are high refractory materials produced with silicon carbide (SiC) as raw materials. It has good wear resistance and corrosion resistance, high temperature strength, high thermal conductivity, small coefficient of linear expansion, and good thermal shock resistance. In the iron and steel smelting, it can be used for ladle lining, nozzle, plug, blast furnace and iron tank, bosh, BOF and EAF taphole, heating furnace without water cooling slide etc.. In smelting nonferrous metals (zinc, copper and aluminum), they are widely used in distillers, distillation tray, electrolytic cell side wall, molten metal pipe, suction pump and smelting metal crucible. In silicate industry, it is used as the roof boards of various kilns and flame-proof materials, such as muffle furnace lining and sagger etc.. In the chemical industry, it is mainly used in oil and gas generator, organic waste calciner, petroleum gasifier and desulphurization furnace. In addition, the space technology can be used as a rocket nozzle and a high temperature gas turbine blade.
Zirconium containing refractory bricks. Is a kind of acidic material is natural zircon sand (ZrSiO2) as raw material to prepare products. Zirconium firebrick is different from the silicon aluminum refractory brick and carbon brick, the slag resistance and thermal expansion rate is low, the thermal conductivity decreases with the increase of temperature, high load softening temperature, wear-resistant high strength, good thermal shock resistance, which has become an important material in various industrial fields. With the development of continuous casting and vacuum degassing technology in metallurgical industry, zircon refractory brick is used more and more widely, mainly in the following categories.
(a) zircon brick, in the steel-making process, by tapping degassing method, and zircon refractories for molten steel slag, corrosion resistance and good thermal shock resistance, and is suitable for working under reduced pressure, it is widely used in metallurgical industry with masonry degassing ladle liner, with stainless steel Sheng the steel ladle lining, continuous casting ladle lining, casting nozzle brick, brick, brick plug sleeve and high temperature induction furnace lining etc.. Zircon refractory bricks are highly resistant to acid slag and glass, and are also widely used in the serious damaged parts of the glass kiln that melted the most active glass. Zircon refractory material also has the nature of metal aluminum, aluminum oxide and slag penetration, and achieved good results in the aluminum smelting furnace bottom.
(two) AZS electric melting brick, also known as fused zirconia corundum brick, with the development of glass industry, AZS electric melting brick has become the key part of glass furnace, refractory material. It resists the erosion of glass liquid.
(three) AZS RESINTERED electrofusion brick is mainly used for the thermal equipment, such as the bottom, the wall and the regenerative lattices of the building glass tank kiln.
(four) zirconium mullite electric melting brick, which is characterized by dense crystal structure, high load softening temperature, good thermal shock resistance, high mechanical strength, good wear resistance, good thermal conductivity and excellent resistance to slag erosion at normal temperature and high temperature. The use of this kind of products are widely used in metallurgy, heating furnace, soaking furnace, calcium carbide furnace outlet, glass kiln wall, the effect is very good.
Heat insulation refractory bricks. It refers to refractory materials with high porosity, low volume density and low thermal conductivity. Heat insulation refractories are also known as light refractories. It includes the following categories.
(1) high aluminum heat insulation lightweight refractory brick. It is a heat insulating lightweight refractory brick with bauxite as the main AL2O3 content not less than 48%. The production process of the foam method, also can use burn addition method. High alumina lightweight refractory bricks can be used in masonry insulation layer and parts without strong high temperature melting material erosion and scour. When direct contact with the flame, the surface contact temperature of the general high alumina insulating refractory bricks should not be higher than 1350 degrees C. The mullite insulation refractory bricks can be directly exposed to the flame. It has the characteristics of high temperature resistance, high strength and remarkable energy saving effect. It is suitable for the lining of the pyrolytic furnace, hot blast stove, ceramic roller kiln, electric porcelain drawer kiln and various kinds of resistance furnaces.
(two) the clay insulating lightweight refractory brick is a heat insulating refractory brick with AL2O3 content of 30% ~ 48% made from fire clay as the main raw material. The production process using burn add characters and foam. In Boulder, refractory clay, refractory clay clinker as raw material, and sawdust mixed with binder, mixing, mixing, molding, drying, sintering, prepared volume density is 0.3 ~ 1. 5g/cm3 products. The output of the clay insulating brick accounts for more than half of the total output of the heat insulating brick.
The Chinese standard (GB 3994 - 1983) divides the clayey thermal bricks according to the volume density into NG - 1.5, NG - 1.3A, NG - 1.3b, NG - 1, NG - 0.9, NG 0.8, NG - 0.7, NG - 0.6, 0.5 - 0.5 and 0.5 - 0.410 grades.
(three) diatomite heat insulation firebrick, is a heat insulation refractory made from diatomite as the main raw material. It is mainly used in heat insulation below 900 degrees C.
China Standard (GB 3996 - 1983) divides diatomite thermal insulation products into GG 0.7A, GG 0. 7b, GG 0.6, GG 0. 5a, GG 0.5B and GG 0.4 0.4 according to volume density.
(four) bead brick, with floating beads as the main raw material made of insulating refractory products. Flotation from fly ash cenosphere is a thermal power plant in the aluminium silicate hollow glass beads. It has light body, thin wall, hollow, smooth surface, high temperature resistance and good heat insulation. The use of these beads can produce excellent characteristics, heat insulating materials with excellent performance. The production of cenosphere brick can adopt semi dry method.