Introduction
Magnesia carbon brick is made from high-melting-point alkaline oxide MgO (melting point 2800°C) and high-melting-point carbon materials, which are resistant to slag infiltration. Various non-oxide additives are added, and the materials are combined with a carbon-based binder to form a composite, non-fired refractory material.
As a composite refractory, magnesia carbon brick effectively utilizes magnesia's strong resistance to slag erosion and carbon's high thermal conductivity and low thermal expansion, compensating for magnesia's main weakness-poor spalling resistance.
MgO:≥69-85% C:≥5-18% Bulk density:2.87-3.15g/cm
Advantage
Excellent High-Temperature Resistance: Both magnesium oxide and graphite have high melting points and no eutectic point, allowing magnesia carbon bricks to withstand temperatures above 1600°C without softening or melting.
Strong Resistance to Slag Erosion: Magnesia resists alkaline and high-iron slags. Graphite has a high wetting angle with slag, making it difficult to be infiltrated. Together, they provide superior erosion resistance.
Good Thermal Shock Stability: Graphite's high thermal conductivity, low thermal expansion, and low modulus of elasticity give the bricks excellent resistance to thermal shock, minimizing cracking and spalling during rapid temperature changes.
Improved Thermal Conductivity: The graphite component enhances thermal conductivity, allowing for rapid heat transfer and more uniform temperature distribution within the furnace.
High Strength at Elevated Temperatures: Magnesia carbon bricks maintain their strength at high temperatures, resisting deformation and collapse, thus ensuring the stability and safety of furnace linings.
ZINFON Magnesium-Carbon Brick
The Application of ZINFON Magnesium-Carbon Brick in Ladle Project
Physical and Chemical Specifications - Ladle
| Brand | GMC5 | GMC8 | GMC10 | GMC12 | GMC14 | GMC16 | GMC18 | |
| Index | ||||||||
| MgO(%) | ≥ | 87 | 84 | 82 | 80 | 76 | 74 | 72 |
| C(%) | ≥ | 5 | 8 | 10 | 12 | 14 | 16 | 18 |
| Apparent Porosity(%) | ≤ | 5.0 | 5.0 | 4.0 | 4.0 | 3.0 | 3.0 | 3.0 |
| Bulk Density(g/cm3) | ≥ | 3.10 | 3.08 | 3.02 | 3.00 | 2.97 | 2.95 | 2.93 |
| Cold Crushing Strength(MPa) | ≥ | 45 | 45 | 40 | 40 | 35 | 35 | 35 |
| Hot Modulus Of Rupture1400℃×0.5 | ≥ | 6 | 6 | 8 | 8 | 10 | 10 | 10 |
The displayed indicators are for reference only.
Physical and Chemical Specifications - Converter
| Brand | MC12A | MC14A | MC10A | MC14A | MC16A | MC14A | |
| Index | |||||||
| MgO(%) | ＞ | 83 | 76 | 80 | 78 | 74 | 78 |
| F.C(%) | ＞ | 10 | 14 | 10 | 12 | 16 | 12 |
| Apparent Porosity(%) | ＜ | 4 | 3 | 4 | 4 | 3 | 3 |
| Bulk Density(g/cm3) | ＞ | 3.02 | 2.98 | 3.02 | 3.00 | 2.96 | 3.00 |
| Cold Crushing Strength(MPa) | ＞ | 40 | 35 | 40 | 40 | 35 | 40 |
| Hot Modulus Of Rupture1400℃×0.5 | ＞ | 6 | 12 | 14 | 12 | 10 | 12 |
| Application Position | Furnace bottom | Furnace shaft, molten pool | Impact position | Tapping hole | Trunnion position | Furnace top cap | |
The displayed indicators are for reference only.
Physical and Chemical Specifications
|
Type |
Apparent Porosity % ≤ |
Bulk Density g/cm³ |
Cold Crushing Strength MPa ≥ |
MgO% ≥ |
C% ≥ |
|
MT-5A |
5 |
3.15±0.08 |
50 |
85 |
5 |
|
MT-5B |
6 |
3.10±0.08 |
50 |
84 |
5 |
|
MT-5C |
7 |
3.00±0.08 |
45 |
82 |
5 |
|
MT-8A |
4.5 |
3.12±0.08 |
45 |
82 |
8 |
|
MT-8B |
5 |
3.08±0.08 |
45 |
81 |
8 |
|
MT-8C |
6 |
2.98±0.08 |
40 |
79 |
8 |
|
MT-10A |
4 |
3.10±0.08 |
40 |
80 |
10 |
|
MT-10B |
4.5 |
3.05±0.08 |
40 |
79 |
10 |
|
MT-10C |
5 |
3.00±0.08 |
35 |
77 |
10 |
|
MT-12A |
4 |
3.05±0.08 |
40 |
78 |
12 |
|
MT-12B |
4 |
3.02±0.08 |
35 |
77 |
12 |
|
MT-12C |
4.5 |
3.00±0.08 |
35 |
75 |
12 |
|
MT-14A |
3.5 |
3.03±0.08 |
40 |
76 |
14 |
|
MT-14B |
3.5 |
2.98±0.08 |
35 |
74 |
14 |
|
MT-14C |
4 |
2.95±0.08 |
35 |
75 |
14 |
|
MT-16A |
3.5 |
3.00±0.08 |
35 |
74 |
16 |
|
MT-16B |
3.5 |
2.95±0.08 |
35 |
72 |
16 |
|
MT-16C |
4 |
2.90±0.08 |
30 |
70 |
16 |
|
MT-18A |
3 |
2.97±0.08 |
35 |
72 |
18 |
|
MT-18B |
3.5 |
2.92±0.08 |
30 |
70 |
18 |
|
MT-18C |
4 |
2.87±0.08 |
30 |
69 |
18 |
Comparison with Other Refractory Materials
Superior High-Temperature Resistance: Magnesia and graphite withstand over 1600°C without melting or softening, making magnesia carbon bricks more effective in high-temperature environments.
Enhanced Slag Erosion Resistance: These bricks outperform others in resisting alkaline and oxidizing slags, especially in iron and steelmaking.
Excellent Thermal Shock Resistance: Their ability to withstand rapid temperature fluctuations surpasses that of many traditional refractories.
High-Temperature Strength: They maintain mechanical strength under extreme temperatures better than many low-temperature-strength refractories.
process
Taking high-quality electrofused magnesia sand and flake graphite as the main raw materials, using thermosetting phenolic resin as the binder, and adding metal antioxidants, through scientific and reasonable particle size grading, it is molded under high pressure by a press of 800T or more. The product has good high-temperature resistance performance, good oxidation resistance and performance of resisting slag erosion.
-Raw Material Preparation: Select high-purity magnesia particles, carbon materials (e.g., graphite), and binders such as tar pitch or resin. To prevent carbon oxidation, additives like aluminum, silicon, magnesium, or boron nitride (≤5%) are included.
-Batching: Raw materials are weighed and mixed according to required performance specifications.
-Mixing: Materials are mixed thoroughly at elevated temperatures to form a uniform, plastic mixture.
-Molding: The mix is shaped using a hydraulic press at 100–200 MPa. The resulting blank should have a density of 2.8–3.0 g/cm³. Moisture should be kept below 40% to prevent graphite degradation.
-Drying and Curing: Dry in a kiln at 110–200°C for 24–48 hours, keeping the heating rate under 5°C/h to avoid cracking.
-Firing: Sintering is typically carried out at 1500–1700°C for 8–24 hours.
Applications
Iron and Steel Industry
Converter Linings: Used in furnace bodies and caps, where bricks resist high-temperature steel, slag scouring, and frequent thermal shocks.
Electric Arc Furnaces:Commonly applied near electrodes in hot zones, where they endure intense heat and slag/steel erosion.
Refining Furnaces: Withstand high-temperature, high-alkalinity slag erosion and molten steel agitation.
Ladle Slag Line: Protects the contact area between molten steel and slag, improving steel purity and ladle lifespan.
Non-Ferrous Metal Smelting
Copper Smelting: Serves as lining in smelting and refining furnaces, resisting high-temperature slag and metal corrosion.
Nickel Smelting: Adapts to high temperatures and complex slag conditions.
Lead/Zinc Smelting: Used in furnaces such as blast and reflector furnaces to resist erosion from gases, slag, and molten metals.
Glass Industry
Glass Furnaces: Applied in regenerators and checker bricks to withstand hot flue gases and thermal shocks, improving heat recovery and kiln lifespan.
Cement Industry
Rotary Kilns: Used in the transition and firing zones to resist erosion from high temperatures and alkaline materials, reducing maintenance and downtime.
precaution
Storage & Transportation: Store in a dry, ventilated warehouse. Protect from moisture and impacts to avoid cracks or spalling.
Construction & Installation: Follow standard procedures. Ensure even, dense joints to avoid leakage or misalignment.
Operation & Maintenance: Control furnace temperature, atmosphere, and slag composition to avoid excessive wear. Conduct regular inspections and timely repairs to extend service life.
Why chooes us?
01/Customized dimensions and shapes
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Customized Brick Shape
Provide Sample Sheets
1
>>
Mold Opening & Quotation
2
>>
Mold Opening & Sample Making
3
>>
Bulk Production Quotation
4
>>
Contract Signing
5
>>
Bulk Production
6
02/Delivery cycle and logistics
-
Sea freight, land freight. Determine the mode of transportation according to the needs
About 30 days, customized products delivery time depends on the actual situation.
03/Customized packaging
-
Customize your brand
Logo customization, custom fonts, taglines and messages for packaging, signage, websites or printed materials.
Take your brand to the next level, contact us today to discuss your project!
04/Purchase ZINFON refractory Bricks at Reasonable Prices
-
The price of refractory bricks is a known key factor influencing customers' purchasing decisions. Therefore, we offer affordable refractory bricks for sale. Here are several reasons why ZINFON provides refractory bricks at competitive prices:
By collaborating with ZINFON, we ensure that customers enjoy the ex-factory price of refractory bricks, reducing costs from middlemen or distributors. This allows customers to obtain the most cost-effective pricing directly from the source.
Factory price
ZINFON is surrounded by abundant mineral resources. With these high-quality materials, customers can obtain products that are both affordable and excellent in performance.
Low raw material cost
ZINFON possesses advanced production equipment and technologies, enabling the factory to achieve economies of scale and reduce unit production costs. Meanwhile, it ensures a continuous supply of high-quality products at preferential prices.
Mass production
It is worth noting that while price is an important factor, it should not be the sole determinant of your purchasing decision. When buying refractory bricks from ZINFON, quality, reliability, and technical support are equally important considerations.
By choosing ZINFON as your supplier, you can access high-quality refractory bricks, a wide range of other refractory materials, and comprehensive support. Contact ZINFON Refractories immediately to discuss your specific requirements and obtain customized solutions!
7*24 hours online response
Provide professional after-sales protection
Our address
Qinghua Management Dist., Dashiqiao City, Yingkou City, Liaoning, China
Phone Number
+8613700131695
+8618540210631
info@zinfon-refractory.com
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