Zircon Mullite High Alumina Refractory Brick for High Temperature Industrial Furnaces

 High temperature resistance azs 33 41 ws blocks zircon mullite high alumina refractory brick for furnace

The scientific name of AZS refractory brick is fused zirconia corundum brick. It is made by completely melting the raw materials and casting them in a mold, then cooling and condensing them. Mainly for the use of glass furnace.

1. Erosion of fused zirconium corundum brick
The erosion of fused zirconium corundum brick is mainly divided into physical action and chemical action.Physical action refers to the glass melting pool wall in the long-term operation process, repeatedly subjected to the impact of rapid cooling and heat, its surface is bound to undergo the change process of shrinkage - expansion.Due to excessive fatigue, the structure of fused zirconium corundum brick is damaged, resulting in increased cracks in the surface layer and loose structure.Therefore, under the action of airflow, material and liquid glass scouring and cracking, peeling, and this process will continue to repeat.
The chemical erosion of fused zirconium corundum brick is more complex and intense, which can be divided into four aspects:
(1) the precipitation of glass phase
The electrofused zirconium corundum brick of the pool wall is subjected to the action of high temperature glass solution for a long time (>;1500℃), on the one hand, the glass phase in the brick will gradually melt out (the lowest precipitation temperature is about 1150℃);On the other hand, the alkaline glass liquid containing Na2O will invade the brick along the pores and cracks, and diffuse and penetrate into each other with the precipitated glass, thus reducing the viscosity and improving the fluidity of the precipitated glass, and further aggravating the erosion behavior and extending to the depth.
(2) Damage to skeleton
With the deepening of the glass solution erosion, the skeleton minerals that constituted the brick body were gradually infiltrated and surrounded by the glass solution containing Na20, and the skeleton began to be eroded.First, the dissolved mullite decomposes into α-Al203 and Si02, and then causes α-Al203 to transform into β-Al203.With the increase of temperature, β-Al203 all dissolved in the glass solution, and plagic plumbite and corundum crystal lattice were also damaged, and then fractured, disintegrated and partially melted.β-Al203 gradually dissolves in the glass at high temperature and is rarely retained. With the continuous diffusion and penetration of glass, the plagioplastite microcrystals become free. Some of them are taken away with the glass liquid and may become glass stones, while some of them are retained.Although plagioplagite can be dissolved into glass, its solubility is very small. With the fluctuation of temperature, Zr02 will crystallize rapidly from the glass solution, forming skeleton or beaded plagioplagite crystals.
(3) Crystallization of new minerals
Because the skeleton minerals of the brick body were partially melted in the glass solution, the composition of the original glass solution was changed.Therefore, when the ratio of Si02 - Al203-Na20 in the glass solution is close to the theoretical composition of nepheline, a large number of nepheline crystals will be precipitated.
Al203 + 2Si02 + Na20→+ 2NaAlSi04(nepheline)
(4) the invasion of nepheline
Because the density of nepheline is less than that of brick, the brick structure becomes loose when nepheline crystal is precipitated along with the expansion of larger volume.Although the melting of part of the crystalline phase in the brick will increase the viscosity of the glass liquid and have a certain bonding and protection effect on the loose structure, it still can not completely block the airflow, material and glass liquid scour and the effect of gravity in the kiln, and crack and flake into the glass liquid, forming glass stones.After exfoliation, the wound surface continued to be eroded and scoured by liquid glass and continued to exfoliate.The result will inevitably lead to erosion and disintegration of fused lead corundum brick.
2. Prolong the service life of fused fused corundum brick in glass electric furnace
As is known to all, the glass tank is melted horizontally, the material and liquid level moves horizontally, and there is serious erosion at the three-phase interface outside the liquid drain hole, as shown in Fig. 1.Glass electric furnace is vertical melting, most of the cold top melting, glass liquid level is covered by a layer of raw material, there are few three-phase interface.Because of the vertical melting, the erosion of the pool wall brick is no longer concentrated in the three-phase interface, but the overall erosion, so the weak link of the fused corundum brick is the breakthrough of erosion

Packaging

1. 1 ton bags in container, 25 MT/20'FCL.
2. 25kg bags in container, 25 MT/20'FCL
3. 25kg bags in ton bags, then in container, 25 MT/20'FCL
4. as the customer' request

Packaging of SK37 High Alumina Refractory Brick

1.on wooden pallets with plastic cover: wooden pallet size :930*930 or 1000*1000mm,
2.Load weight of each pallet: 1.5-2.0 tons,

Shipping of SK37 High Alumina 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, quality and quantity guaranteed, and also in accordance with the contract and customer's requirement completely.

Delivery:

15-30 days working day for large quantity. The shipment we will arrange as soon as possible. Of course, if it is a custom products, the shipping time will delay.
Sample:

Usually by EMS, DHL, UPS, TNT, FedEx. Anyway you like. Bulk order: Usually by sea.

Payment:

It can be through T/T, L/C at sight. The specific terms determined according to the quantity of the goods, etc.
Your inquiry related to our product & price will be replied within 24 hours.
Export:
Our products have been exported to many countries: Australia, Chile, USA, Russia, UK, Indonesia, etc., good quality have be approved by our clients.

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,  Korea, Vietnam, Pakistan, Bulgaria, French, India, Egypt,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 

Our competitive Advantage:

1.Competitive Price. Make the products competitive in your market.

2.Quick Response:We promise quick response at the very first moment when we received your request. 3.Superior Customer Service:The company provides after sales service ensuring customer’s satisfactions,we believe in Long term partnership bringing loyalty.  

4.We had been on this filed for many years and we have our own research team,the prouduction process could be concrolled strictly.

5.We have developed stable customer base overseas and kept long-term  cooperation.