How to make magnesia carbon brick

 The article describes in detail the process of how to make magnesium carbon bricks. What’s more, the article also expresses some other issues related to magnesia carbon bricks. Weclcome to visit our factory to see magnesium carbon brick product process.

Magnesia carbon brick Production process

The steps in the production process of MgO-C bricks are described here. First, the refractory raw materials are graded into coarse, medium, and fine sizes and are classified as necessary.  Next, they are mixed and kneaded with a binder in pre-determined blend proportions by parti­cle size. The kneaded mixture is press formed into bricks. 

By a magnesia-carbon brick there is understood a brick based mainly on the components burned magnesite, carbon in the amount of typically 5-30% carbon by weight and a suitable binder. Magnesia-carbon bricks are used in the wear lining of a converter for steel production, and are substantially more resistant to wear than magnesite bricks in which the percentage of carbon used is not so high. The wear lining of a converter can, depending on the price of the bricks, be wholly or partly constructed from magnesia-carbon bricks, especially at the location of the trunnions of the converter, where the wear is greatest.

Magnesia Carbon Brick for sale

Production process for MgO-C bricks

Uniaxial forming with an oil press or a friction press is normally used as the pressing equipment. The magnesia aggregate and graphite in MgO-C bricks show orientability depending on the forming di­rection of the press. The strength and thermal conductivity of MgO-C bricks show anisotropy . It is hence important to consider the forming direction of bricks when laying the bricks. A cold isostatic press (CIP) with small anisotropy is also used for the production of large refractory products such as bottom blowing tuyere bricks and taphole bricks.

Formed bricks are dried to remove moisture and other volatile components, processed, and coated as needed, visually inspected for cracks, chips, and other defects, and dispatched after removing defective bricks.

MgO-C (magnesia-carbon) refractories are widely used in several steelmaking linings. These refractories are exposed to extreme stress due to high temperatures (T > 1600 °C) required to cause the metallurgical reactions. These working conditions produced refractory wear through various related processes. The different types of degradation that the material suffers can be from thermochemical or thermomechanical origin.

Method for the manufacture of a magnesia-carbon brick, comprising the steps of:

a. preparing a mixture comprising:

1. burned magnesite

2. carbon

3. a binder solution comprising:

3.1 pre-condensed novolak resin

3.2 a solvent for this novolak resin.

4. a hardener for the resin.

b. pressing a brick from the mixture.

The method also provides bricks produced by the method and a converter having a wear lining consisting at least partly of such bricks.

FAQ:

How are magnesia carbon bricks made?

The traditional magnesia carbon brick manufactured by the synthetic tar binder in the cold mixing process is hardened during the process of tar damage and the necessary strength is obtained, thus forming isotropic glassy carbon.

What is the use of magnesia carbon bricks?

MgO-C (magnesia-carbon) refractory bricks are widely used in steel industry, the primary consumer of refractory linings, such as basic oxygen furnaces, electric arc furnaces, and ladle furnaces.

What is the raw material for magnesia carbon bricks?

Sea water magnesia is mainly used in SAIL as the main raw material for manufacturing of magnesia carbon bricks.

What is magnesia carbon brick?

Magnesia-Carbon brick is resin-bonded brick made from dead-burned or fused magnesia and graphite. Anti-oxidant is added if required. Our control over bonding agents mean that these products are classed as eco friendly in terms of steel production.

In conclusion, Welcome to learn how to make magnesia carbon bricks and learn other information about magnesia carbon bricks. If you are interested in other refractory products and production processes, please feel free to browse our website or visit our factory.

Article Source:How to make magnesia carbon brick
Company name: Henan Changxing Refractory Materials Co.,Ltd
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Magnesia Carbon Bricks

How to avoid clogging in tundish nozzles

 

Various methods employed to avoid clogging in Tundish nozzles are:

1.Erosion of Alumina build-up

2.Steel reinforcement of Alumina matrix

3.Flow model studies

4.Argon purging facility in the bore of nozzles

5.Anti-clogging mix employment at bore

Tundish nozzles are manufactured by alumina carbon refractory material. The porosity ranges between 12%-15%. In order to have a purging facility however, the bore porosity must be >18% without compromising strength. 

Tundish Nozzle

The results of tundish nozzles Clogging

Clogging in continuous casting tundish nozzles is build-up of material in flow passage between the tundish and mold, and results in:

Decrease in productivity

If clogging becomes sufficiently severe, the flow control device will no longer be able to compensate, resulting in either a decrease in casting speed or making it necessary to replace the nozzle. These events reduce net casting throughput and thereby reduce productivity.

Increase in cost

Depending on the casting shop, some portions of clogged nozzles (e.g. submerged entry nozzle) can be independently replaced during casting. This is done by use of a sub entry shroud or a tube changing SEN. However other clogged refractory (e.g. tundish nozzle) can only be replaced by changing tundishes. Therefore nozzle clogging results in additional costs in terms of tundish refurbishment or nozzle replacement.

Depletion of quality

Clogged particles can get dislodged from the build-up and result in unacceptable cleanliness-related defects in the product. The restriction of flow passage may also cause biased flow patterns in the mold which thereby cause quality problems such as mold flux ingestion, shell thinning etc.

The process of Continuous Casting has achieved new heights in recent years, as tundishes are no longer treated as simply a transfer vessel but as a metallurgical reactor. Progress in technology has led many producers to move to casting high quality steel of all grades with very long casting duration i.e. >20 hrs. We all know nozzle clogging has been a serious productivity and quality problem in continuous casting of Aluminium killed steel, which limits the slab casters to last a defined (short) time. This led to development of TCD (Tube Changing Device) casters where the SEN can be changed during an ongoing casting process.

In addition, products of steel-refractory interactions such as CA6, commonly found in tundish nozzles, were observed in the lab tests. Alumina-graphite nozzle materials were shown to clog at a faster rate since industrial alumina-graphite has strong thermochemical interactions with steel. No significant steel-refractory interactions were observed in the pure oxide or zirconia-graphite nozzles however.

Tundish Nozzle for sale

FAQ:

What is a tundish nozzle?

Tundish Nozzles are an integral part of Continuous Steel Casting process. These products are instrumental in controlling the flow of Molten Steel from Tundish to Continuous Casting.

What is the function of a nozzle?

The primary function of a nozzle is to control flow rate and convert the spray liquid into droplets (via atomisation) that are of a suitable size for depositing on the intended target.

What is the result of  tundish nozzle clogging?

Irregular flow through a tundish nozzle increases the probability of generating a number of quality defects such as re-oxidation of the steel and slag entrapment. Nozzle clogging also affects productivity in that less steel is able to be cast because of the blockage in the nozzle.

What is the HS code for tundish nozzle?

69032090

Why is my tundish nozzle clogging?

The cause of the clogging is related to a combination of operating criteria including ladle slag practice, tundish refractory, deoxidation methodology and temperature.

What causes nozzle clogging?

The reason behind this problem is that some of the old material remains in the extruder due to the lower temperature needs of the new material. As a result, the old filament will not melt completely, and the residue left behind may cause the nozzle to clog in the long run.

How to choose right refractory materials used in furnaces

 This article will introduce the types and application fields of refractory materials. Through this article, you can have a comprehensive understanding of refractory materials and learn more about the advantages of refractory materials. On the other hand, understand the main use areas and manufacturing processes of refractory materials.

How to choose right refractory materials

Refractories should have high structural strength and can withstand long-term mechanical loads at operating temperature. Refractories should have good resistance to the components of the batch materials, molten glass and gaseous substances. Refractories should produce minimum contamination to the glass.

Types of Refractory Materials

1. Fired Refractory Products

2. Non-Fired Refractory Products

3. Special Refractory

4. Monolithic Refractory (Bulk Refractory Or Refractory Concrete)

5. Functional Refractory Materials

6. Clay Bricks

7. High Alumina Bricks

8. Silica Bricks  

9. Magnesium Bricks

10. Corundum Bricks

11. Ramming Material 

12. Plastic Refractory 

13. Casting Material

Refractory material characteristics:

Depending on the working conditions of various steel furnaces, the working conditions of refractory materials were found to be very difficult. Therefore, the refractory materials used must have the following characteristics:

High-temperature resistance and high fire resistance.

Wear resistance and wear resistance of heat-resistant steel and slag.

For the intermittent operation of the steelmaking furnace, the refractory material must have excellent thermal shock and fracture resistance.

It has high mechanical strength, can tilt the blows of the furnace, and withstand the load of the furnace without damage.

There are many operations and processes for secondary steelmaking, such as vacuum degassing and ladle refinancing. Refractory materials use a unique combination of various bricks to meet diverse requirements. The following can be observed:

The high temperature and long retention time of molten steel in the ladle.

Wide variation of slag composition Various types of vacuum treatment. Thermal changes.

The stirring of molten steel causes erosion of molten steel movement.

In all ladle refining processes such as ladle furnaces, ASE-SKF and VAD processes,ladle MgO-C bricks are used in areas where slag and steel are in contact. For general walls, high alumina bricks are widely used. The bottom zircon bricks are used to prevent molten steel from penetrating into the joints of the bricks. In some cases, MgO-C, Al2O3-C bricks and molds are used in the impact area. MgO-C bricks with added metal pairs have high thermal strength and excellent oxidation resistance.

Refractory materials include natural ores and various products made by certain purposes and requirements through certain processes, which have certain high-temperature mechanical properties and good volume stability. They are the necessary materials for various high-temperature equipment.

FAQ:

How do you select refractory materials?

Refractories should have stable volume at high temperature and the residual expansion and contraction should be small. Heat capacity, thermal expansion coefficient, thermal conductivity and other thermal properties should meet the requirements. Refractories should have neat appearance and accurate shape and size.

What are the basics of refractory materials?

Refractory material is a material that is resistant to decomposition of heat, pressure or chemical attack and retains strength and form temperatures. The basic refractory materials include alumina, silica, magnesia and lime.

How are refractory material made?

This process involves using an electric arc furnace to melt the refractory raw materials, then pouring the melted materials into sand-forming molds. Another type of refractory process is ceramic fiber production. In this process, calcined kaolin is melted in an electric arc furnace.

Through this article, you already had an in-depth understanding of the advantages and application fields of refractory materials.What’s more,you can also view company news to learn more about refractory  industry news. If you need refractory materials, please contact me.

Article Source: https://www.cxrefractories.com/en-refractory-news?article_id=1260
Company name: Henan Changxing Refractory Materials Co.,Ltd
More refractory products:https://www.cxrefractories.com/en-product-solution
Email:info@cxrefractories.com
Website:https://www.cxrefractories.com