Fused cast refractory is a special type of refractory made by melting the raw materials in the electric arc fuace, 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 fuace.

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 chaels, superstructures and lipstone of the high quality glass and special glass fuaces. 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 chael,ect.. After the oxygen-fuel technology is applied in the glass fuaces, beta alumina block replace the silica brick to be used in the crown.

Fused cast AZS block is the most widely used fused cast refractory used in the float glass fuace 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 aealing 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 coer, throat, etc..

Fused cast high zirconia block is specially designed refractory for glass fuace 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.

Zhengzhou Sunrise is a refractory material supplier from China, offering high quality refractory materials for glass fuaces, including fused cast AZS block, fused cast alumina block, fused cast high zirconia block, mullite brick, zircon brick, alumina bubble brick, magnesia brick, sillimanite brick, corundum brick, low porosity fireclay brick, high alumina brick, all kinds of glass fuace ramming masses, etc..

The popular type of fuace used for the production of E glass is the unit fuace. More than 10 kinds of refractories are used to build to the fuace.

Fused cast AZS block

Fused cast AZS 33# is mainly used in the buer block of the melting zone and the feeder block.

Dense chromium oxide brick

Dense chromium oxide brick has the best resistance to the corrosion by E glass. It almost causes no pollution to the glass liquid. It is ideal for the E glass fuace. It is made by isostatic pressing. It has a very dense structure. It contains more than 94% Cr2O3 and less than 15% pores and its bulk density is 4.24g/cm3. Its erosion loss is only 1/10 of that of the dense zircon brick. It is mainly used in the high temperature glass-contact areas, such as the sidewall and the tank bottom of the melting zone and the sidewall of the main chael and transition chael.

Dense zircon brick

The resistance of Dense zircon brick to high temperature and E glass is not as good as dense chromium oxide brick. It is made by isostatic pressing too. It contains more than 65% ZrO2 and less than 2.0% pores and its bulk density is 4.25g/cm3. If the operating temperature exceeds 1370℃, it will be eroded. It is mainly used as the bottom block in the lower temperature parts of the melting zone and the forming chael and transition chael, flow block and back-up block.

Zircon brick

Zircon brick contains 66% ZrO2 and its bulk density is 3.7g/cm3. It has good thermal stability and good creep resistance. Its is the sidewall and breast wall of the feeder port where the erosion of batches is severe, peep hole and the breast wall, crown and buer of the flame space of the chael.

Sintered mullite brick

Sintered mullite brick contains more than 74% Al2O3;2.2% SiO2 and its bulk density is 2.5g/cm3. It is generally used as the back-up brick of the zircon brick, the breast wall and front wall of the melting zone, the lining brick of the flue of the chael, the foot parts of the crown and the outside layer of the discharging port

There is another type of mullite brick which is made by melting the raw materials first to form mullite crystals and then sintering it. It has better resistance to creep and thermal shock than mullite brick. It can be used in the crown and the breast wall of the flame space.

Fused cast mullite brick

Fused cast mullite brick is made of the bauxite, high quality alumina powder and clay by the fused cast method. It is mainly used in the flue.

Fused chrome corundum brick

Fused chrome corundum brick contains 28.3% Cr2O3, 58.3% Al2O3, and 5.2% MgO and Fe2O3. Its bulk density is 3.4g/cm3. It is used as the flue interface brick of the heat exchanger.

Besides the refractories mentioned above, difference types of fireclay brick and insulation brick are used in the outside layer of the fuace.