How to distinguish the quality of high alumina refractory bricks

Application
High-alumina bricks are commonly used for industrial furnaces such as steel, steel making, hot blast stoves, electric furnace tops, blast furnaces, reverberatory furnaces, rotary kiln linings, etc., which are mainly composed of high alumina bauxite; sillimanite minerals (including Kyanite, red sill, sillimanite, etc.; artificial composition of materials, such as industrial alumina, mullite, fused corundum and so on.)
Characteristics
1.Strong wear resistance
2. Excellent thermal conductivity
3. Great resistance to impact
4. Great slag resistance
Factors affecting quality

Color
When buying high-alumina bricks, the first thing to look at is color. The excellent high-aluminum brick surface is lubricated, the color is yellow and white, the four sides are flat, no break angle, no cracks.
Appearance impurity
In addition, it is to look at the content of impurities on the surface of refractory bricks. In high-aluminum bricks, we often see some black spots on the surface. These are the impurities in the raw materials. In theory, the less impurities, the better, because most of these impurities are the iron oxide is simply reduced to molten iron in the high temperature environment of the kiln, which forms the damage of the refractory brick structure and then affects the service life of the refractory brick.
Weight
To weigh the weight of a single brick, take the T-3 standard brick as an example. The weight of the first grade high aluminum brick is 4.5kg or so. The second-grade high-alumina brick has a single weight of around 4.2kg, and the third-grade high-aluminum brick has a single weight of about 4.0 kg. The equal grade, the equal parameter type can reach this specification and can be regarded as an excellent high-aluminum brick. On the contrary, the quality of this component cannot be achieved.
Article Source:China ladle lining materials development
Company name:Henan Xinmi Changxing Refractory Materials Co.,Ltd
Email: sales1@chinafirebrick.com
Website:http://www.chinafirebrick.com/

Matters need attention for the sintering of tundish lining

To save cost and make it easy to use, it’s better to make a fast sintering to increase the temperature in tundish to 1000-1100℃ 1 to 2 hours before it is put into use.
For slab continuous casting, normally Al-C monoblock stopper or integrated Al-C submerged entry nozzle would apply with tundish. If the sintering is too long, the strength of monoblock stopper and SEN will be lowered, if they are with bad anti oxidizing coatings, they could be oxidized, which will further lower their strength and service life.

The changing rules of the strength of aluminium carbon products during sintering is: With the increasing of sintering temperature, the strength goes down, when the temperture is between 500℃ to 600℃, it has the lowest strength. When the temperature goes up again, the strength will go up, when the temperature is 1300℃, it will go back to original level, but when the temperature rise again, the strength will go down. For this reason, it is required that the sintering should be fast to get the preset temperature asap.

Changxing refractory provides refractory products, calcium silicate products, castable & mortar, china refractory brick, ceramic fiber felt, ladle & tundish nozzle, ceramic fiber with high quality for you. Such as high alumina refractory bricks, magnesia carbon brick, clay refractory bricks and other refractory products.

Article Source:Matters need attention for the sintering of tundish lining
Company name:Henan Xinmi Changxing Refractory Materials Co.,Ltd
Email: sales1@chinafirebrick.com
Website:http://www.chinafirebrick.com/

The importance of correct refractory design

As we all know, the refractory design remains the most fundamental factor in all furnaces construction. Refractory design details and proven technology consideration is of paramount importance to come up with an optimum furnace life and to maintain productivity in the life span of the furnace lining.

The failure to produce a technically or operationally durable refractory design lining could give rise to premature deterioration of the refractory lining and furnace shell.

The premature failure of the furnace lining will lead to extensive heat losses, furnace bath shift, change in tap hole orientation and alteration of the Pitch Circle Diameter. In this way, the pre-design of refractory lining is very important, we must pay attention to every details, finding out the most suitable refractories for each part.
Our technical team can give you a perfect design which is suitable for your furnaces according to specific needs, please contact us freely if you’re interested.

Changxing refractory provides refractory products, calcium silicate products, castable & mortar, china refractory brick, ceramic fiber felt, ladle & tundish nozzle, ceramic fiber with high quality for you. Such as high alumina refractory bricks, magnesia carbon brick, clay refractory bricks and other refractory products.

Article Source:The importance of correct refractory design
Company name: Henan Xinmi Changxing Refractory Materials Co.,Ltd
Email: sales1@chinafirebrick.com
Website:http://www.chinafirebrick.com/

Refractories and Classification of Refractories

Refractories are the raw materials which are resistant to heat and exposure to different degrees of mechanical stress and strain, thermal stress and strain, corrosion/erosion from solids, liquids and gases, gas diffusion, and mechanical abrasion at various temperatures. In simplified language, they are considered to be materials of construction which are able to withstand high temperatures. Refractories are usually inorganic non-metallic materials with refractoriness greater than 1500 deg C. They belong to coarse-grained ceramics having microstructure which is composed of large grains. The basis of body is coarse-grained grog joined by fine materials.
Changxing refractory provides refractory products, calcium silicate products, castable & mortar,china refractory brick, ceramic fiber felt, ladle & tundish nozzle, ceramic fiber with high quality for you. Such as high alumina refractory bricks, magnesia carbon brick, clay refractory bricks and other refractory products.
Article Source:Refractories and Classification of Refractories
Company name: Henan Xinmi Changxing Refractory Materials Co.,Ltd
Email: sales1@chinafirebrick.com
Website:http://www.chinafirebrick.com/