Magnesia Carbon Brick Manufacturer
Magnesia Carbon Brick is a great choice for your steel production needs.
Magnesia Carbon Brick for EAF
Magnesia Carbon Brick for LF
What is magnesia-carbon brick ?
Magnesia-carbon bricks are made from high melting point Basic oxide magnesia (melting point 2800 ° C) and high melting point carbon materials which are difficult to be infiltrated by slag. Unburned carbon composite Refractory made from a combination of carbon binders.
Magnesia-Carbon brick is a great choice for converters, EAFs, ladles, and refining furnaces.
What are the types of magnesia-carbon brick ?
Application of magnesia-carbon brick
Mgo-carbon brick is mainly used for lining of converter, AC electric arc furnace, DC electric arc furnace, slag line of ladle and other parts.
Advantages of Magnesia Carbon brick:
As a composite Refractory, magnesia-carbon brick makes good use of the slag resistance of magnesia and the high thermal conductivity and low expansion of carbon to compensate for the worst spalling resistance of Magnesia. Its main characteristics are: with good high temperature resistance, slag resistance, good thermal shock resistance, low creep at high temperature.
The results show that the MgO-C brick made of the mixture of fused magnesia and sintered magnesia, with 15% flake graphite and a small amount of mg-al alloy as the antioxidant, has good application effect, compared with MgO-C brick containing 18% C without anti-oxidant, the damage rate of 100 t LF ladle slag line is reduced by 20-30% , and the average corrosion rate is 1.2-1.3 mm/furnace.
You can trust our products to help you achieve better results in your steel production !
Chemical composition of magnesia-carbon brick
Magnesite is the main raw material of MgO-c brick, which is divided into fused magnesite and sintered magnesite. Compared with sintered magnesite, fused magnesite has the advantages of coarse crystal grains and large particle volume density, and is the main raw material in the production of magnesia-carbon brick. In order to produce ordinary magnesia Refractory, the raw material of Magnesia is required to possess high temperature strength and corrosion resistance, so the purity of Magnesia and the C/s ratio and B2O3 content in its chemical composition are emphasized. With the development of metallurgical industry and the increasingly harsh smelting conditions, the magnesia used in MgO-c brick used in metallurgical equipment (converter, electric furnace, ladle, etc.) , in addition to its chemical composition, in the aspect of microstructure, high density and large crystallization are also required.
In addition to graphite, carbon black is also widely used in the production of magnesia-carbon brick. Carbon Black is a kind of highly dispersed black powder carbonaceous material, which is produced by thermal decomposition or incomplete combustion of hydrocarbon hydrocarbons. The carbon black particles are small (less than 1 μm) , the specific surface area is large, and the mass fraction of carbon is 90-99% , high purity, high powder resistivity, high thermal stability, low thermal conductivity, is difficult to graphitized carbon. The addition of Carbon Black can effectively improve the spalling resistance of MgO-C brick, increase the amount of residual carbon and increase the density of brick.
Common binders for MgO-C bricks include coal tar, coal tar and petroleum asphalt, as well as special carbonaceous resins, polyols, modified Phenol formaldehyde resin, synthetic resins, etc. . The binders used are of the following types:
If the binder is carbonized to form a mosaic structure and a carbon fiber material is formed in situ, then the binder will improve the high temperature performance of the Refractory.
Production process of magnesia-carbon brick
2.1 Ratio of mud (%)
Electric fusion sintered magnesia 70~85, flake graphite 15~20. Additive 5~10; phenolic resin (additional) 5~7, curing agent amount.
2.2 Mud mixing
The effect of mud mixing is directly related to the quality of the product. Therefore, the following technical measures should be taken for the forming process:
①Preheat the magnesia particles to about 40°C to ensure uniform mixing;
②The binder is preheated to 30~40°C to increase fluidity;
③ pre-mix the curing agent and resin and then add to the mud;
④ Strictly control the amount of resin added to ensure that it evenly wets the mud and prevents agglomeration, and it is necessary to ensure the time for the material to be trapped.
The feeding sequence is: magnesia particles→graphite→bonding agent→tube mill powder→asphalt, and the total mixing time must be ensured.
Magnesia Carbon Bricks specification standard
The sampling and acceptance of products shall be carried out in accordance with GB/T 10325, and the apparent porosity, bulk density, compressive strength at room temperature and the content of MgO and C shall be the acceptance inspection items.
For Electric Arc Furnace
|Cold Crushing Strength||MPa||40||40||40||35||30|
|Refractoriness Under Load T2||℃||–||–||–||–||–|
For Ladle Furnace
|Cold Crushing Strength||MPa||40||35||35||35||40||35|
|Cold Crushing Strength||MPa||40||35||35||33||40||35|
LMM YOTAI Magnesia Carbon Brick
located at “Magnesium city”of China, we have material location advantage.
Japanese technology & management.
• 1 set 2100 tons automatic hydraulic press.
• 2 sets 1850C Tunnel Kiln annual production capacity: 80000 tons.
we supplied to Greece, Bulgaria, Ukraine, Mexico etc.. we can also do OEM for you.
With our Magnesia Carbon Brick you can produce steel in a more environmentally friendly way. You won’t have to worry about your furnace overheating or corroding. Plus, our bricks resist spalling, so you’ll get longer life out of your furnace.
The company strictly according to modern enterprise management requirements set up a perfectquality assurance system, and passed the ISO9001:2008 quality management system certification, ISO14001:2004 environmental management system certification, OHSAS18001:1999 occupationalhealth and safety management system certification.
* Inquiry and consulting support.
* Planning layout and Design requires machinery
* Welcome visit our Factory.
* Engineers available to service machinery overseas.
* IN-TIME delivery goods.
* Free charges for installing, training and debugging.
* Long-term technical support.
Contact us today to learn more about our magnesia-carbon bricks !