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Anshan Yuhang Technology Engineering Co., Ltd

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Phone number: +86-139-4128-8112

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Company address: Xingyangqi Village, Dadaowan Town, Qianshan District, Anshan City, Liaoning Province


Unshaped refractories

2019-05-22
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The acid refractories use silicon oxide as the main component, and silicon bricks and clay bricks are commonly used. Silica brick is a siliceous product containing more than 94% of silicon oxide. The raw materials used are silica and waste silica brick. It has strong resistance to acid slag erosion, high load softening temperature, and does not shrink in volume after repeated calcination, or even slightly expands; However, it is easily eroded by alkaline slag and has poor thermal shock resistance. Silica brick is mainly used in thermal equipment such as coke oven, glass melting furnace, acid steel-making furnace and so on. Clay bricks use refractory clay as the main raw material and contain 30% to 46% of alumina. They are weak acid refractory materials and are resistant to thermal shock.


Neutral refractories have alumina, chromium oxide or carbon as the main components. Corundum products containing more than 95% of alumina are high-quality refractory materials with a wide range of uses. Chrome bricks with chromium oxide as the main component have good corrosion resistance to steel slag, but poor thermal shock resistance and low deformation temperature at high temperature. Carbonaceous refractory materials include carbon bricks, graphite products and silicon carbide products, which have a low thermal expansion coefficient, high thermal conductivity, good thermal shock resistance, high temperature strength, resistance to acid and alkali and salt corrosion, especially weak acids and alkalis. Good resistance, not subject to wetting by metal and slag, light weight. It is widely used as high temperature furnace lining material, and also used as lining of autoclave for petroleum and chemical industry


Alkaline refractories use magnesium oxide and calcium oxide as the main components, and magnesium bricks are commonly used. Magnesia bricks containing more than 80% to 85% of magnesium oxide have good resistance to alkaline slag and iron slag, and the refractoriness is higher than clay bricks and silica bricks. Mainly used in open furnace, oxygen blowing converter, electric furnace, non-ferrous metal smelting equipment and some high temperature equipment.


Refractory materials used in special occasions include high-temperature oxide materials, such as aluminum oxide, lanthanum oxide, beryllium oxide, calcium oxide, zirconium oxide, etc., refractory compound materials, such as carbide, nitride, boride, silicide and sulfide Etc.; high-temperature composite materials, mainly including cermets, high-temperature inorganic coatings and fiber-reinforced ceramics.


Bulk refractory material (indefinite refractory material): Indefinite refractory material is a refractory material that is composed of a reasonable grade of granular and powder materials and a binder, and is directly available for use without forming and firing. Generally, the granular material constituting such a material is called aggregate, the powdery material is called admixture, and the binding agent is called cement. This type of material has no fixed shape, and can be made into a paste, a paste, and a loose form, so it is also commonly known as a bulk refractory. This kind of refractory material can be used to form an integral structure without joints, so it is also called integral refractory material.


The basic composition of amorphous refractories is granular and powdery refractories. According to its use requirements, it can be made of various materials. In order to combine these refractory materials as a whole, except for very few special cases, generally the appropriate variety and quantity of binders are added. In order to improve its plasticity or reduce water consumption, a small amount of appropriate plasticized water-reducing agent can be added. To meet other special requirements, a small amount of other suitable additives can also be added separately.


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