December 12

The Performance Of Chrome Corundum Brick

General

 

Properties and Application of Chromium Corundum Brick.
Fire resistance of the product
In the high-purity corundum material by adding Cr2O3, regardless of the amount of how much, not only will not reduce the fire resistance of materials, but to improve the fire resistance of materials. Chromite corundum bricks (> 1790) are superior to high purity corundum products in terms of fire resistance and load resistance (> 1700!).
1. The strength of the product
Room temperature compressive strength of high purity corundum brick is usually 70 ~ 100MPa, room temperature high compressive strength of high-performance chrome corundum brick is generally greater than 150MPa, the intensity was significantly higher than corundum brick. This is because the products in the combustion process, between particles and particles, particles and fine powder, powder and powder formed between the Al2O3-Cr2O3 solid solution, solid solution particles and fine powder particles together, so that the strength of the material to achieve greatly increased.
2. Thermal shock resistance
When the Cr2O3 content is 10% to 66%, Cr2O3 is added to the corundum. Raw materials Chromium Corundum series of products using alumina and chromium oxide with a certain proportion of high-temperature melting after the synthesis of solid solution

Properties of Chromium Corundum Brick.

Fire resistance of the product

In the high-purity corundum material by adding Cr2O3, regardless of the amount of how much, not only will not reduce the fire resistance of materials, but to improve the fire resistance of materials. Chromite corundum bricks (> 1790) are superior to high purity corundum products in terms of fire resistance and load resistance (> 1700!).

1. The strength of the product

Room temperature compressive strength of high purity corundum brick is usually 70 ~ 100MPa, room temperature high compressive strength of high-performance chrome corundum brick is generally greater than 150MPa, the intensity was significantly higher than corundum brick. This is because the products in the combustion process, between particles and particles, particles and fine powder, powder and powder formed between the Al2O3-Cr2O3 solid solution, solid solution particles and fine powder particles together, so that the strength of the material to achieve greatly increased.

 

2. Thermal shock resistance

When the Cr2O3 content is 10% to 66%, Cr2O3 is added to the corundum. Raw materials Chromium Corundum series of products using alumina and chromium oxide with a certain proportion of high-temperature melting after the synthesis of solid solution

 


December 05

The Melting Technology Of Fused Cast AZS Block

General

 

Melting AZS block melting technology is divided into reduction and oxidation.
Reduction method, also known as submerged arc method, is the graphite electrode immersed in the furnace charge, because the electrode in the oxygen shortage of combustion, recovery of a series of recovery reactions, so that some high-oxide melt instability, together with the carbon Also into the melt, which will eventually melt the color black.
In the ablation process, the charge charge of the circuit is not carburizing or melting impregnation, carbon decarburization before casting, which makes the melt without carbon technology, known as oxidation, also known as the arc method. Because of the existence of carbon in AZS recovery method, when used in the glass kiln, high-temperature combustion of carbon, the gas will be squeezed out of the soft glass phase, accelerating the corrosion of glass on the brick, so the presence of carbon corrosion resistance AZS bad, Now more choice of oxidation rather than recovery methods, AZS charcoal in the history of the main graphite electrode during the discharge will not use the arc into the furnace, so need to find a way to prevent coal into the furnace. Here are a few common ways:
Long arc method
The electrode does not melt in the furnace and eliminates carbon transfer between the electrode and the melt.
Add oxidizer method
Some oxygen enrichment is added to the constituent material, which releases oxygen during the melting process. The molten liquid evaporates on the surface of the carbon combustion, but is usually smelted by a bright arc, with arc melting during the refining process.
Through the oxygen method
There are a lot of the same methods, but the oxygen is blown back after melting. Some will oxygen lance pierced from the roof, a number of oxygen gun placed in the mouth, so that the furnace forward melting submerged tube oxygen lance, a trace of molten carbon melt contact with oxygen escape.

Fused cast AZS block's melting technology is divided into reduction and oxidation method.

Reduction method, also known as submerged arc method, is the graphite electrode immersed in the furnace charge, because the electrode in the oxygen shortage of combustion, recovery of a series of recovery reactions, so that some high-oxide melt instability, together with the carbon Also into the melt, which will eventually melt the color black.

In the ablation process, the charge charge of the circuit is not carburizing or melting impregnation, carbon decarburization before casting, which makes the melt without carbon technology, known as oxidation, also known as the arc method. Because of the existence of carbon in AZS recovery method, when used in the glass kiln, high-temperature combustion of carbon, the gas will be squeezed out of the soft glass phase, accelerating the corrosion of glass on the brick, so the presence of carbon corrosion resistance AZS bad, Now more choice of oxidation rather than recovery methods, AZS charcoal in the history of the main graphite electrode during the discharge will not use the arc into the furnace, so need to find a way to prevent coal into the furnace. Here are a few common ways:

Long arc method

The electrode does not melt in the furnace and eliminates carbon transfer between the electrode and the melt.

Add oxidizer method

Some oxygen enrichment is added to the constituent material, which releases oxygen during the melting process. The molten liquid evaporates on the surface of the carbon combustion, but is usually smelted by a bright arc, with arc melting during the refining process.

Through the oxygen method

There are a lot of the same methods, but the oxygen is blown back after melting. Some will oxygen lance pierced from the roof, a number of oxygen gun placed in the mouth, so that the furnace forward melting submerged tube oxygen lance, the melt of the trace carbon combustion escapes by contact with oxygen.