refractory

Zirconium-containing corundum brick Zirconia, zircon as raw material to produce corundum brick. Zirconia series products, zircon series products, zirconium mullite and zirconium corundum series of products belong to such products. According to the different production processes, zirconium-containing corundum brick is divided into sintered products, fused bricks and non-burning products. Zirconia-containing corundum brick has the characteristics of high melting point, low thermal conductivity and good chemical stability, and has good corrosion resistance to molten glass in particular.

The Zr-O system has several phases of oxygen in zirconium oxide and a non-stoichiometric oxide of the same melt. The stable compound of zirconium and oxygen is dioxide ZrO2. Zirconium dioxide has an ion radius ratio of 0.66, which is close to the limit of crystal coordination numbers 3 and 6. The zirconium cation is larger in size (0.082 nm) .In order to achieve the 8 coordination, oxygen ions are not as close as possible in the crystal lattice. Therefore, ZrO2 exhibits anomalous coordination. When its coordination number is equal to 7, one of the oxygen atoms occupies the space between two nodes of the AB crystal lattice. A lattice coordination and B lattice 4 coordination, High temperature by ions in the lattice node thermal motion occurs longer bond length is due to oxygen ions from the unit space transition to the A or B position knot preclude. Anion vacancies at the same time to achieve the 8 coordination.

The properties of Zr-bearing corundum bricks depend on the nature of ZrO2. Density and Stabilization The melting point of zirconia is 2677 ℃ and the temperature is 2500 ℃. The bulk density fluctuates 4.5 ~ 5.5g / cm3 due to the purity of the raw materials and the manufacturing method. The bulk density of compact zirconium corundum brick can reach 5.75g / cm3. Sintered zirconium corundum brick and liquid glass can not afford chemical reaction. Caustic solutions, carbonate solutions and acids (except concentrated H2SO4 and HF) do not react chemically with zirconia. ZrO2 has high structural strength and as a lining of the hot surface has the ability to work at 2200 ~ 2450 ℃ temperature.

Zirconia corundum brick high mechanical strength, and strength has been maintained to 1300 ~ 1500 ℃. The thermal conductivity of ZrO2 is much lower than the thermal conductivity of all other oxide materials. The use of ZrO2 this feature can be made of high temperature insulation layer.

In the shipment of refractory bricks, should pay special attention to the occurrence of bumps, so as to avoid cracks and corner, affecting the quality of refractory bricks. So the handling must be refractory bricks and rice bandaged, in the handling process should be lightly put.

In order to facilitate the use, to avoid misuse, storage should be in accordance with the variety of firebrick, shape, different models were stacked. Each kind of refractory bricks should be in accordance with the actual needs of the necessary reserve. Storage should be dry, so as not to reduce the quality of refractory brick water.

After the refractory brick into the factory, should carry out verification and selection work, will not grid (if crack and corner) out. Validation of the important inspection of refractory bricks chemical composition, type, shape, whether the degree of compliance requirements, such as for refractoriness, resistance to rapid cooling, pressure and other experiments on the more difficult. On the proportion of refractory requirements of the error is not greater than 3 mm, such as the error is too large, will bring the puzzle to the puzzle, puzzle quality is also difficult to guarantee.

The quality of refractory bricks is one of the key conditions to determine whether the kiln can operate safely all the year round. So pay attention to the handling of refractory bricks, good fire brick storage and verification work can not be ignored.

The refractory bricks can fill the pores between the pig iron particles while forming a gel with the liquefied product, with the alkaline material magnesium oxide lining to form a gel. In the pig iron-based concrete, mortar and refractory castables, mixed with the amount of refractory bricks, refractory steel and castables should be made by the laboratory construction tacit ratio. In strict accordance with the tacit than construction. In the agitation of refractory steel, the refractory bricks should be added to the stirrer after the aggregate is put on. Refractory bricks in the composition process, due to the process of transition due to the effect of cortical tension, constitute non-crystalline amorphous spherical particles, and the cortex is quite clean, and some are a number of ball particles adhere to an example of the comon The It is a very much deeper than the skin layer, the activity is very high volcanic ash objects. Mixed with refractory bricks, fine spherical body can play a lubricating effect.

The production of high temperature refractory material is closely related to the development of glass industry. Improve the glass process depends on the use of high temperature melting and to create a highly uniform and high purity glass products …
The production of high temperature refractory material is closely related to the development of glass industry. Improve the glass process depends on the use of high temperature melting and to create a highly uniform and high purity glass products, for which, requires the use of better and better quality refractory materials.

In glass production, the use of liquid fuels and natural gas as energy sources also raises the question of improving the quality of refractories. Improve the quality of refractory glass industry, but also because of the rapid pace of residential construction in recent years. Thus requiring more and more high-quality glass results. Growing cars, airplanes and other industrial sectors also need high-quality glass. Therefore, in recent years, the glass industry must not only improve the quality of glass, but also increase its output. To achieve this goal, we must first reduce the waste glass production, increase productivity and extend the service life of glass tank kiln. From the above tasks, the highly stable fused refractories play an especially important role in the effective development of the Soviet glass industry. In other words, the technological advances made by the Soviet Union and foreign glass industry over the last decade in the production of sheet glass are largely due to the adoption of such refractory materials.

Refractory raw materials processing is to enter the factory of various shapes and sizes of refractory raw materials (including raw ore and clinker) into the required size, and remove impurities mixed with refractory raw materials for the preparation of brick use.
Refractory raw material processing include: selection of refractory raw materials, crushing, grinding, fine grinding and screening
The selection of raw materials into the plant
The selection of refractory raw materials into the plant there are two main purposes: (1) selected mixed in the raw materials in the debris, under burning material, not burning fuel and tumor blocks, etc .; (2) According to the appearance of refractory raw materials Features are stacked for ease of management and use.
Broken smashing purposes
The mechanical method (or other methods) exerting external force on the large refractory raw materials so as to fragment them into small pieces or fine powders is called raw material crushing and pulverizing.
Usually two or three broken crushed. That broken – broken pieces of material from 250-300mm broken 40-50mm;
Crush – Material block size from 40-50mm crushed to 4-5mm;
Fine grinding – finely ground material size from 4-5mm to less than 0.088mm.
The purpose of crushing is to prepare massive refractory raw materials into pellets and fine powders with a certain granular composition so that powders of different compositions are prepared and mixed uniformly; the specific surface area of ​​the raw materials is increased and the physicochemical reaction speed is increased.
Impact broken broken factors
There are two factors influencing the crushing and breaking: on the one hand, it is related to the structural properties of the refractory raw material itself – strength, hardness, homogeneity, cleavage and plasticity; on the other hand, it is related to the characteristics of the equipment used, Broken product size requirements are closely related. Generally, the crushing ratio (the ratio of the average diameter of the material before it is crushed to the average diameter of the material after it is crushed) is lower, and the lower the productivity of the machine is.
Broken crushing process and characteristics
There are usually two types of crushing processes: open flow and closed flow. Open flow advantage is the simple process, refractory raw material only through the grinder once. The disadvantage is the power consumption, low productivity, and produce excessive flour, is not conducive to improving the quality of products. Although there is no above closed-flow shortcomings, but the process is complex, requiring more ancillary equipment. The advantage is higher crushing efficiency, easy to reach the degree of particle material requirements. Usually refractory raw materials broken open-flow, and crushed by closed-flow circulating crushing.

Refractory brick is a good refractory material, mainly used in the construction of kilns. The quality of refractory bricks are also good or bad, good quality firebrick durable fire effect. So high-quality refractory bricks should have what

Glass kiln refractory materials (such as fused zirconia corundum brick) in the course of its use, to withstand high temperature, rapid temperature changes, changes in the atmosphere and dust, flue gas, molten metal and slag erosion, the damage mechanism is very complicated, it is difficult Make the right judgment.
Glass kiln refractory used in the process of damage, not only the slag erosion (continuous), but also fracture and picks (non-continuous type) factor. After a comprehensive analysis of the results of the use of refractory materials for glass kilns, the way of damage during use can be summarized into three basic forms.
1, Due to the mechanical stress and thermal stress of the structure, the glass kiln is damaged by irregular cracks (thermal and mechanical peeling or flaking) on ​​the refractory lining.
2, Due to the continuous scouring of the molten glass, the infiltration of molten slag and the temperature fluctuation on the hot surface (working surface), the structure of the fused zirconia corundum brick is changed, and thus the unique metamorphic layer is formed. In the original layer and the metamorphic layer The interface with the heating surface parallel to the crack and damage.
3, due to the glass melt, slag and soot reaction and melt flow and wear, mainly due to the liquid phase and AZS brick surface layer of corrosion.
Refractory glass kiln used in the process, in fact, is thermodynamically unstable. Therefore, the direction of the research and development of refractories for glass kilns is to establish a kinetic barrier within (and in the vicinity of) the refractory to resist the deterioration caused by the eventual irreversible structural and compositional changes

Ceramic Fiber Board is made of Alumino-Silicate fibrous wool by vacuum forming process.
Characteristic:
♦ Fibers are bonded by binder
♦ Low density and low thermal conductivity
♦ Shorter heat up and cool down time
♦ Resilience and resistance to thermal shock
♦ Greater mechanical strength
♦ Can withstand gas flow velocity of 30 m/sec
♦ Even density, thickness
♦ Flexible and easy to cut or install
♦ Asbestos free

China’s metallurgical industry will continue to develop steadily, in the number of scale growth rate will slow down, but in improving quality, develop varieties and reduce energy consumption are required to achieve a higher level. Therefore, backward, old technology and equipment will be gradually eliminated, and advanced technology and equipment to promote the application will be accelerated. For example, in the iron and steel industry, furnace and small blast furnace, converter and electric furnace will be eliminated, and continuous casting and furnace refining will be faster and development and application. These conditions will provide a new and good opportunity for the development of refractory bricks, as well as new and stringent requirements for the quality of refractory bricks and will lead to more intense use among hundreds of refractory tiles manufacturers in China competition.

China’s metallurgical industry will continue to develop steadily, in the number of scale growth rate will slow down, but in improving quality, develop varieties and reduce energy consumption are required to achieve a higher level. Therefore, backward, old technology and equipment will be gradually eliminated, and advanced technology and equipment to promote the application will be accelerated. For example, in the iron and steel industry, furnace and small blast furnace, converter and electric furnace will be eliminated, and continuous casting and furnace refining will be faster and development and application. These conditions will provide a new and good opportunity for the development of refractory bricks, as well as new and stringent requirements for the quality of refractory bricks and will lead to more intense use among hundreds of refractory tiles manufacturers in China competition.

Fused Cast AZS are the most widely used materials both in glass contact and superstructure of glass melting furnaces.
What’s Fused Cast

The term Fused Cast refers to a manufacturing process in which the ceramic bonding is obtained by the solidification of a mixture which has been melted in an electric furnace and cast in liquid state into molds.

► Fused Cast AZS Blocks Introduction

AZS fused cast block is also called fused cast block which is abbreviated as AZS because it contains Al2O3－ZrO2－SiO2. Fused cast AZS block is made from pure alumina powder and Zircon sand (composed of 65% zirconia and 34% SiO2). After Alumina powder and zircon sand melting in electric furnace, they are cast into various molds and cool themselves down to become white solid. Because of the different content of Zirconia from 33%-41%, our fused cast AZS blocks can be divided into three types AZS—33#,AZS—36# and AZS—41#.
TY-AZS33 Description

Fused cast AZS 33# block has dense micro structure which ensures its great resistance in glass liquid, thus you don’t have to worry about the solidification and other problems. It is widely applied to glass furnace for superstructure, working pool side wall, paving blocks, feeder channels, tank bottoms, C-shaped block and doghouse crown,etc.

►Advantages
1. Compact microstructure
2. Good erosion resistibility to molten glass
3. Good thermal shock resistibility,high compression resistance
4. Barely rendering blister
5. A variety of formats and shapes for furnace different working areas

Fused Cast AZS are the most widely used materials both in glass contact and superstructure of glass melting furnaces.
What’s Fused Cast

The term Fused Cast refers to a manufacturing process in which the ceramic bonding is obtained by the solidification of a mixture which has been melted in an electric furnace and cast in liquid state into molds.

► Fused Cast AZS Blocks Introduction

AZS fused cast block is also called fused cast block which is abbreviated as AZS because it contains Al2O3－ZrO2－SiO2. Fused cast AZS block is made from pure alumina powder and Zircon sand (composed of 65% zirconia and 34% SiO2). After Alumina powder and zircon sand melting in electric furnace, they are cast into various molds and cool themselves down to become white solid. Because of the different content of Zirconia from 33%-41%, our fused cast AZS blocks can be divided into three types AZS—33#,AZS—36# and AZS—41#.
TY-AZS33 Description

Fused cast AZS 33# block has dense micro structure which ensures its great resistance in glass liquid, thus you don’t have to worry about the solidification and other problems. It is widely applied to glass furnace for superstructure, working pool side wall, paving blocks, feeder channels, tank bottoms, C-shaped block and doghouse crown,etc.

►Advantages
1. Compact microstructure
2. Good erosion resistibility to molten glass
3. Good thermal shock resistibility,high compression resistance
4. Barely rendering blister
5. A variety of formats and shapes for furnace different working areas

With the development of the world automobile industry in recent years the technology on rearview mirror is also greatly improved, as demands a higher request on mold bricks in terms of its performance and quality. We have been working on the research and development. of Mold Bricks since 2000, and in March 2003 success was achieved in the trial manufacture, in Sep 2003 a Mold Brick production line was established, and we are now a factory specialized on Mold Brick for Viewing Mirrors.