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Zircon-Mullite Bricks

  • Zircon-Mullite Bricks



1.Has a high resistance to acids, alkalis and glass liquids

2.Used for contact with molten glass

3.Used in the upper structure of glass melting furnaces
Zircon-Mullite Bricks Introduction

Zircon-Mullite Bricks for glass furnace is a white solid formed by pure alumina powder and zircon sand containing zirconia 65% and about 34% silica in the electric furnace and then injected into the mold to be cooled. The AZS bricks structure consists of an eutectoid and a glass phase of corundum and zirconium, AZS fused cast bricks are phased as eutectoids of the corundum phase and the zircon oblique phase, the glass phase is filled between their crystals.

Zircon-Mullite Bricks Application

Refractory zircon mullite brick is melted and casted in high temperature electric furnace by high quality mullite grops,AZS refractories brick is mainly used in areas that require good wear-resistance and high temperature resistance,such as gliding rail bricks in steel pusher metallurgical furnaces,the tapping platform(tapping spout)for tapping platform (tapping spout)style walking beam metallurgical furnaces,azs bricks also as the interior lining for destructors.

Zircon-Mullite Bricks Specification
 
Al203 73%
Zro2 5.5%
SiO2 19%
Na2O 1%
Corundum 38%
Baddeleyite 5%
Mullite 40%
Vitreous Phase 17%
True specific Gravity 3.54g/cm3
Cold Crushing Strength 350Mpa
RefractorinessUnder Load of 0.2Mpa 1700℃
Thermal Expansion Rate 0.8%
Thermal Conductivity 4.6W/m.K
Apparent Porosity ≤8%

Zircon-Mullite Bricks Using Precautions in Glass Kiln

1.Irregular Changes in Thermal Expansion

The expansion curve of the zircon mullite firebrick has an anomaly near 1000 °C, the internal ZrO2 crystal undergoes a reversible crystal transformation with a large volume change. Therefore, AZS block product containing ZrO2 should not be used at around 1000 °C, the temperature is often A region that fluctuates sharply. When baking the kiln, the temperature change at 900~1150 °C should not be too large, generally can not exceed 15 °C / h, requiring a steady temperature rise. AZS fused cast bricks parts should be protected from blowing cold air and protected by other bricks to prevent cracking.

2.Shrinkage

When casting, there are often shrinkage holes in the casting mouth, and azs refractory brick body has more pores and poor density. Therefore, when the glass wall of the glass melting part is made, the shrinkage holes are directed toward the direction of the kiln. When AZS refractory brick is eroded to a very thin level, azs brick will cause a leakage of glass liquid. When used in the upper flame space of the kiln, the service life is very long, and there is no problem of running glass. Therefore, the casting port is used outwards to extend the service life.

3.Eutectic

The refractory zircon mullite brick and the clay brick are in contact with the clay brick. The eutectic phenomenon occurs at a high temperature of 1300 °C. Therefore, when the refractory material is selected, the two refractory materials with severe eutectic phenomena should be avoided from contact with the masonry, such as silica brick casting. Below AZS fused cast bricks ,AZS brick is most susceptible to erosion by the fused cast AZS brick.

Zircon-Mullite Bricks Packing & Delivery

Consider various and complex transportation conditions,all fused cast azs bricks products are packing following the highest standards with foam boards between every two blocks, corners protected with triangular hard card boards by steel bands and wrapping in plastic film on the outside.

For easy location of different materials,zircon mullite refractory bricks packing lists are places both inside and outside packages, and shipping marks are clearly painted on all cases.

Why Choose RS Refractory as Refractory Bricks Supplier
 
Rongsheng company adhering to the “integrity ,innovation,hard work”business philosophy,the “people-oriented”as the cornerstone of enterprise development to pursuit of excellence as the core values of the enterprise,will create “Rongsheng Brand”as a corporate strategic objectives.Product  types rich scientific management processes,improve customer information management system,timely,efficient,to proved satisfactory service to our customers.We can provide competitive prices and excellent service .Consult with many professional engineers to deal with your problems.Choose us as your supplier, we will become your loyal partner and solve your problems.

RongSheng Refractory Factory have any Certificate according to client requirement,such as ISO9001 certificate, CE.
 
If you worry about the RS Refractory factory ,which is not satisfy with your high requirement and remove you doubts,welcome to visit our factory & company,the technologists & designers waiting for you.

If not sure what refractory material or refractory bricks you need,please tell us your any requests on refractory material performance and specification & working temperature & working environment as well as application ,according to your requirement ,that we can recommend suitable refractory bricks,we can make sure that you can’t disappointed.

If you make sure what firebricks you need ,please provide the drawings you used in the past, we can do better ,satisfy your any technology requests.

RongSheng Refractory have the professional sales team,if you have any smaller problem ,we can solve them at any time. We treat every client as a friend ,friend is precious.