Fused Cast Refractories And Float Glass Furnaces

Fused cast alumina block includes alpha alumina block, beta alumina block and alpha-beta alumina block. Alpha-beta alumina block mainly consists of intertwined crystals of alpha alumina and beta alumina with just a small amount of glass phase. It has excellent corrosion resistance to glass liquid under 1350℃ and produces almost no pollution to the glass liquid, so it is widely used in working tank, feeder channels, superstructures and lipstone of the high quality glass and special glass furnaces. Beta alumina block has a higher resistance to alkali vapor, thus it has excellent thermal shock resistance and does not form molten droplets. It is the best material for molter crown, port crown,feeder channel,ect.. After the oxygen-fuel technology is applied in the glass furnaces, beta alumina block replace the silica brick to be used in the crown.

Fused cast AZS block is the most widely used fused cast refractories used in the float glass furnace due to its good corrosion resistance to glass liquid and good high temperature performance. According to the content of ZrO2, fused cast AZS block can be divided into AZS 33#, 36# and 41#. According to the casting method, fused cast AZS can be categorized into PT AZS, QX AZS, ZWS AZS and WS AZS.

The crystal structure of AZS mainly consists of the eutectic crystal of Al2O3 and ZrO2, scattered baddeleyite crystal and a small amount of glass phase and pores. Its micro-structure determines its performance, while its micro-structure is up to the chemical composition, melting method and annealing method.
AZS 33# is generally used in the sidewall, the bottom paving block and the superstructure. In order to eliminate the horizontal mortar joints, large sidewall block made of QX AZS 33# is used. Due to its higher ZrO2 content and better corrosion resistance, AZS 41#, especially WS AZS 41#, is always used in the demanding areas such as the feeder corner, throat, etc..

Fused cast refractory is a special type of refractory made by melting the raw materials in the electric arc furnace, pouring the melt into a mold and cooling the melt to solidify. It features dense structure, good corrosion resistance, low pollution to glass and long service life. Its quality and development has great influence on the service life of the float glass furnace.
Fused cast high zirconia block is specially designed refractory for glass furnace application. It is made of artificial synthesis high purity raw materials through special casting process. The crystalline texture consists of baddeleyite and with the characteristics of excellent high temperature and corrosion resistance, low blister and stoning potential. These advantages can prevent liquid glass from pollution effectively. It is used in sidewall, throat cover, throat support, electrode block, and dam block parts.

Henan Xinmi Changxing Refractory Material Co., Ltd. Located in Henan Province,China.ChangXing's product portfolio covers shaped products such as refractory materials,refractory brick, refractory castable,refractory nozzle, ceramic fiber, slide gate, etc; unshaped products including repair, construction and casting mixes and mortars.exported to more than 20 countries, such as Thailand, Indonesia, Pakistan, Saudi Arabia, South Africa, Turkey, Iran, Iraq and so on.

Development of Ladle Lining Refractory Materials

20th Century 50--70 years, China's steel plants mainly used aluminosilicate refractory materials, including clay, alumina brick and so on. Since the 1980s, China has successively developed the aluminum-magnesium carbon, coal quality calcium and magnesium and other several series of new steel package refractories. Wherein the aluminum-magnesium carbon refractory materials are of varieties, all specifications, is China's major ladlerefractories.
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EAF roof damage mechanism and applicated refractory materials

It is mad of high temperature' electrical calcined anthracite as main a material, medium temperate pitch as binder, through forming, high temperature baking, final precision machining. It features good thermal conductivity and alkaline resistance. It is economic and practical, and mainly applied for blast furnace bottom.

EAF Roof is a spherical structure with electrode hole and smoke output hole. Out part is called main roof, and the mid part is called small roof (also called triangle). When loading raw material, the roof can be removed. EAF process is extremely complex, triangle preform conditions are very harsh. Mainly by the electrode arc radiation, thermal shock, high-speed air stream of molten steel ....................

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Application of monolithic refractories on industrial furnaces

Unshaped refractory material is a supporting material for building furnace, which can be divided into two categories: ramming material and casting material. They are widely applied on industrial furnace, mainly used in the furnace bottom portion, inconvenient construction part and masonry part of cooling element.   ..............................

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Influence of LF Refining Slag Adjustment on Ladle Refractories and Refining Effect

In order to take with the problem of serious erosion of ladle lining during the desulfrization of LF refining, LFrefining slag was adjusted and calcium aluminate system substituted fluorine free refining slag with fluorine. After the adjustment of the slag, the erosion conditions on ladle were improved greatly and refining number, refining ratio and remaining lining thickness after demolishing all increased substantially. 
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Molding methods of refractories and widely used refractories

There are many refractory material molding methods, such as common molding method, vibration extrusion method, extrusion method, pounding method and so on.

At present, when it comes to the production of refractory materials, the most frequent way of molding refractory material is machine pressure molding method which is a way using brick molding machine and mold to compress the clay material into body. because the clay contains 5% water it is called semi-dry molding method. Machine molding is with compact structure, high strength, narrow drying and firing way, and size is also easy to control. It can be divided into the single side pressure, and double sides pressure which can reduce the phenomenon of layer density.

The common refractory material are AZS brick, corundum brick, magnesite chrome brick, directly silica carbide, silicon carborundum brick, nitrides, silicides, sulfide, boride, carbide and other non oxide refractories materials; Calcium oxide, chromium oxide, aluminum oxide, magnesium oxide and so on.

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Low Cement Castable is More Widely Used in Aluminum Industry Than Before

Low cement castable mainly uses alumina material and silica powder as raw materials. It is a kind of powder materials, and is constituted by refractory material together with some agglutinant.

With the development of aluminum industry, the Clay, High Alumina insulating bricks for aluminum alloy melting furnace and holding furnace has been changed from phosphate combined high alumina brick to low cement castable which can prevent molten aluminum permeate refractory products. At the same time, it can extend service life of refractory material at high temperature.

When comes to the heating surface of aluminum, aluminum alloy melting furnace and holding furnace, the low cement castable has taken place of the phosphate combined with high alumina brick. The reasons are as bellow, there is smaller pore size in the structure of low cement castable, molten aluminum and aluminum alloy cannot permeate refractory company easily. It can avoid the oxide in refractory restoring from aluminum. At the same time, the low cement castable possesses high wear resistance. In recent years, as the low cement castable uses molten aluminum as additive, which increase the wetting agent, so the performance has been improved. This kind refractory material has taken place of traditional phosphate combined high alumina brick and low cement castable gradually.