International Standard CaO Content Sintered AZS Refractory Brick for Steel Furnace

Description of Sintered AZS refractory brick

Sintered AZS bricks are made of zircon and alumina as the main raw materials, and pre-synthesized materials are used as aggregates. Since the billet is an inert material, it is not effective to increase the molding pressure to increase the density of the product. The increase in the number of presses of large products may also lead to uneven cracking and density. It is necessary to adjust the critical particle size composition, add the composite binder and a small amount of TiO2. , MgO combustion aid and strengthening sintering to achieve the purpose of dense sintering.

Characteristics of sintered AZS bricks:

1. Resistance to glass liquid and alkali corrosion, erosion resistance

2. Good thermal stability, low thermal conductivity

3. Uniform structure and compactness, low glass phase content

Application of sintered AZS bricks:

Sintered AZS bricks mainly used for the bottom of the glass melting part, the bottom of the cooling part, the small furnace, the grid body of the regenerator, the nose area of the L-shaped hanging wall, etc.

 Technical datas of Sintered AZS brick

Performance of Sintered AZS refractory brick

In industrial production, in order to reduce costs and improve economic efficiency, Sintered AZS refractory brick have been widely used in the manufacture of Sintered AZS refractory brick. The crystal of zircon (ZrSiO4) is a tetragonal crystal, and the crystal form is usually in the shape of a quadrangular prism. The colors are reddish purple, brown, yellow, gray, and the like. The theoretical composition of zircon is ZrO2: 67.23%, SiO2: 32.77%. Zircon has a melting point of 2420 ° C, a density of 4.6 to 4.7 g/cm 3 and a Mohs hardness of 7.5.

The zircon raw material used for the manufacture of zircon bricks requires a purity of 98% to 99%, wherein the content of ZrO2 should be greater than 63%, and the lower the impurity content, the better. When manufacturing a product, the pure zircon fine powder is first pressed into a compact, calcined at about 1600 ° C, then crushed, molded, and finally fired. Zircon is slowly dissociated from 1540 ° C, and dissociates rapidly from 1750 ° C. At 1870 ° C, the dissociation amount reaches 95%, and the dissociation products are monoclinic zirconia and silica glass. As the dissociation progresses, the variant expansion of zirconia also gradually becomes significant. Due to this feature, the final firing temperature of zircon bricks does not exceed 1600 °C. According to the volume change of the zircon body during the firing process, the temperature rise rate below 600 ° C should be slow to facilitate the removal of moisture and organic matter in the body; between 600 and 1200 ° C, sintering has not yet begun. The temperature rise can be accelerated. Between 1200 and 1500 ° C, the green body undergoes severe shrinkage, so the heating rate should be slow. When molding zircon bricks by molding, it is necessary to add appropriate flux and mineralizer. An example of the ingredients is: 40% fused zircon pellets, 40% zircon sand, 20% zircon powder, and a small amount of fluoride. Using dextrin as a binder, it is molded under high pressure. The performance of this brick is shown in Table 1.

Because zircon is cheaper than zirconia, and it is easy to obtain natural raw materials, it does not change in structure, has low linear expansion coefficient and good thermal shock resistance, so it is a valuable refractory material. The zircon brick can be used as a crucible for smelting lead, antimony and other metals and alloys thereof, cast steel ladle lining bricks, nozzle bricks, and containers for melting alkali-free glass and molten pool bricks.

Workshop corner

 Packaging of Sintered AZS refractory brick

 Shipping of Sintered AZS refractory brick

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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