High Temperature Resistant Fused Cast Zircon Corundum Brick for Glass Melting Furnace

Fused cast alumina zircon silica AZS brick zircon corundum brick for glass melting furnace

Electrocast refractory factory supplied fused cast AZS brick zircon corundum brick for glass furnace

Fused AZS bricks, the full name of which is Electrically Fused Alumina-Zirconia-Silicate Refractory Brick, are high-performance, high-temperature and corrosion-resistant refractory materials. They are widely used in glass melting furnaces, ceramic industries, and other fields that need to withstand extreme high temperatures and chemical corrosion environments. This article will provide a detailed introduction to their composition, characteristics, manufacturing process, applications, and development prospects.

Fused AZS bricks are mainly composed of alumina (Al2O3), zirconium oxide (ZrO2), and silicate (SiO2), of which alumina and zirconium oxide provide excellent high-temperature stability and mechanical strength, while silicate ensures the material's corrosion resistance and good thermal shock stability. According to the different zirconium oxide content, fused AZS bricks are usually divided into several grades, such as AZS-33#, AZS-41#, and AZS-36#, and the numbers represent the mass percentage of zirconium oxide.

High temperature resistance: Due to the special composition, fused AZS bricks can maintain structural stability in high temperature environments up to 1700°C or above.

Erosion resistance: It shows strong corrosion resistance in high-temperature molten glass or other corrosive media, especially resistance to alkaline substances.

Thermal stability: Good thermal expansion coefficient matching and thermal shock stability reduce cracks and peeling caused by rapid temperature changes.

Mechanical strength: Even under long-term high-temperature operation, it can maintain high mechanical strength to ensure the stable operation of the equipment.

Casting method of alumina zircon silica AZS brick zircon corundum brick for glass melting furnace

Application of Fused cast alumina zircon silica AZS brick zircon corundum brick for glass melting furnace

AZS-33# products are particularly superior in preventing contamination of molten glass. They have a very small tendency to cause stones, bubbles and basic glass phase precipitation in the glass. They are suitable for the upper structure of the melting pool, the pool wall bricks and paving bricks of the working pool and the material channel.

AZS-36# products are standard oxidation-processed fused zirconium corundum bricks. They have the characteristics of particularly high resistance to erosion of molten glass and low pollution, and the performance in these two aspects is balanced. They are suitable for parts in the glass melting furnace that are in direct contact with molten glass, such as melting pool wall bricks, paving bricks, and charging ports.

AZS-41# products are the highest-grade oxidation-processed fused zirconium corundum bricks. They have the highest resistance to erosion of molten glass and outstanding low pollution to molten glass. They are suitable for parts in glass furnaces that require particularly high corrosion resistance, such as all-electric melting furnaces, liquid flow holes, kiln sills, bubbling bricks, and bricks at the corners of charging ports.

Specification of Fused cast alumina zircon silica AZS brick zircon corundum brick for glass melting furnace

Producing pcessing of Fused cast alumina zircon silica AZS brick zircon corundum brick for glass melting furnace

1. Sand mold making:

The sand mold is made of silica sand and water glass as a binding agent. After the water glass and silica sand are mixed evenly in a mixer, a support box is installed according to the model requirements to start making the sand mold, and then it is loaded on the kiln car and pushed into the drying kiln for drying.

2. Raw material processing and proportioning by computer:

Raw materials such as alumina powder, zircon sand and desiliconized zirconium and other raw materials shall be put into storage for use or sent to raw materials for pretreatment after acceptance. After processing in the raw material workshop, the raw materials are proportioned for use in accordance with different product requirements.

3. Melting process:

Mainly in accordance with the requirements of the production plan, the matched fused zirconium corundum raw materials are added to the automatically controlled electric arc furnace and melted under the best conditions. If the temperature is low, a highly uniform melt cannot be obtained. It is easy to make the casting form a porous body, causing pores and cracks in the molten casting product, and the shrinkage will increase accordingly. The key to the melting process is to maintain a stable melting temperature system to obtain a melt with uniform chemical composition, low carbon content, a certain temperature and good casting properties. The melting process adopts a programmable computer program for automatic melting process control, so that the melting is sufficient and uniform.

4. Casting process:

Pour the molten material into a specially designed product mold. The fused cast electric fusion brick with compact structure and good performance is made. When casting with a suitably overheated melt, the shrinkage cavity of the zirconia corundum bricks is concentrated, the thickness of the dense zone increases, and the density of the entire product also increases. However, when the degree of overheating is too high, although the melt density increases, it is easy to cause cracks and large shrinkage holes in the product.

5. Heat preservation and annealing process:

The cast bricks are slowly cooled, so that the crystals of the prepared fused zirconia corundum bricks grow and form the best structure. Usually, an incubator filled with diatomaceous earth and other thermal insulation materials is used for annealing with molds, or an adjustable temperature resistance furnace or tunnel kiln is used for annealing with molds or demoulding according to a certain temperature system. The initial annealing temperature and holding conditions have a significant effect on the annealing effect.

6. Demoulding process:

The annealed fused cast zirconium corundum bricks are taken out of the cavity using equipment for product inspection.

7. Machining rocessing:

Check the appearance defects, brick size and surface accuracy of the bricks one by one, and carry out high-precision grinding according to the requirements of users to ensure the size and surface accuracy of the bricks.

8. After Machining processing, it is pre-assembled to ensure that the product size is packaged and shipped.

Packing of refractory bricks

Shipping of refractory bricks

1.Our packaging is as per customer’s request
2.Normal goods delivered by sea transport
3.Sample shipping by express
4.We will shipping and delivery goods timely, quanlity and quantity guaranteed, and also in accordance with the contract and customer's requirment completely.

1. Strong professional:
Our company has thirty years producing experience in refractory products. Our manager will supervise on a various refractorys production materials, process control, quality supervision and package delivery, and ensure the products are 100% qualified.

2.Annual supply:
Our company has passed ISO9001 quality management system certification and SGS certification. And the annual supply of shaped and unshaped refractory product is 28, 800-35, 000 tons.

3. Export experiences:
Now we have gained a global sales network reaching Taiwan, Russia, Vietnam, Pakistan, Bulgaria, French, India, Congo, Angola, South Africa, and so on.

4. Production equipment:
Production and testing equipments are new, complete and automated or semi- automated. Such modern facilities and equipments have provided the fine technical guarantee for the production and testing.

5. Testing equipment:
Our company's testing equipments as follows:
High Temperature RUL Tester
Bulk Density Tester
The Pressure Tester
Refractoriness Tester

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