Introduction
Carbon Bricks: Composition and Properties
Carbon bricks are a type of carbonaceous refractory material composed of coke, anthracite, or graphite mixed with tar. Shaped and fired in a reducing flame at 1450°C, these bricks contain 88–90% carbon. They resist erosion from molten metals and slags but are susceptible to oxidation, making them ideal for lining blast furnace hearths and boshes.
Manufacturing and Raw Materials
As neutral refractory products, carbon bricks are formed from carbonaceous materials with binders. Key raw materials include:
Aggregate: Anthracite (low volatile content, dense structure) and metallurgical coke.
Binders: Asphalt, tar, and anthracene oil.
Anthracite is commonly used as the primary aggregate, combined with coke and asphalt binders to ensure structural density.
Advantage
Exceptional Refractoriness
Exhibits extremely high refractoriness, resisting melting or softening. Volatilization occurs only at temperatures above 3000°C, far exceeding blast furnace operating ranges.
High Mechanical Strength
Compressive strength ranges from 250–500 kg/cm², comparable to that of clay bricks.
High Load Softening Point
Load softening temperature is significantly elevated. For high-quality carbon bricks with low ash content, this temperature is virtually non-detectable and far exceeds the 1400°C typical of clay bricks.
Superior Slag Resistance
Resists erosion from most slags, except those with high FeO content.
Excellent Abrasion Resistance
Abrasion strength is comparable to that of clay bricks, effectively withstanding material scouring and wear.
Non-Infiltration Property
Impervious to iron and slag infiltration, preventing adhesion. This reduces the likelihood of skull formation and damage caused by reactions with iron or slag.
Low Thermal Expansion
A low thermal expansion coefficient prevents crack formation during rapid high-temperature cooling-critical for components prone to cracking (e.g., furnace bottoms).
High Thermal Conductivity
Thermal conductivity exceeds that of clay bricks, especially in graphite bricks. This facilitates heat transfer (promoting slag skin formation) but may also increase heat loss.
Zinfon Refractory Technology Co.,Ltd.
We provide one-stop services from technical consultation to design, production, and after-sales support.
Raw materials
Key raw materials for carbon bricks include carbonaceous substances such as anthracite, coke, and graphite, along with binders like bitumen, tar, and anthracene oil. Anthracite, with its low volatile content and dense structure, is commonly used as the aggregate. It is combined with metallurgical coke and bitumen binders to produce carbon refractory bricks.
Physical and Chemical Specifications
|
Item |
unit |
Index |
|
Ash |
% |
8 |
|
Cold Crushing Strength |
Mpa |
38 |
|
Apparent Porosity |
% |
20 |
|
Bulk Density |
g/cm3 |
1.56 |
process
Raw Material Preparation
Crush low-ash coke into fine particles (<10 mm).
Mix with 16–18% coal tar, along with 6 mm crushed coke aggregates.
Molding
Pressurize the mixture to reduce porosity and form brick blanks.
Roasting
Place blanks in a sealed furnace, covering them with sand to isolate them from air.
Roast at 1000°C for several days, ensuring no air gaps in the furnace. Heat transfer occurs via conduction through the sand.
types
Ordinary Carbon Bricks
Micro-Porous Carbon Bricks
With an average pore size of <0.5 μm, these bricks are produced using high-temperature (1500–2000°C) calcined anthracite, with additions of graphite powder, silica powder, and medium-temperature asphalt as the binder. They exhibit excellent alkali resistance, thermal conductivity, molten iron resistance, oxidation resistance, and ferromagnetic permeability. They are primarily used in areas of blast furnaces subject to abnormal erosion, such as ring seam sections and other vulnerable parts.
Ultramicroporous Carbon Bricks
These bricks have an average pore diameter of <0.1 μm, with over 80% of the pore volume consisting of sub-0.1 μm pores. They offer excellent conventional physicochemical properties and performance. Their low permeability makes them ideal for blast furnace bosh and hearth linings, where they resist alkali corrosion and iron penetration, enabling high efficiency, energy savings, and extended furnace life.
High-Temperature Molded Carbon Bricks
These bricks demonstrate outstanding high-temperature performance, including high thermal and electrical conductivity, alkali corrosion resistance, thermal shock resistance, and low permeability. Their small size minimizes temperature gradients, making them ideal for lining blast furnace boshes, bellies, and lower furnace sections.
application
Metallurgical Industry Applications
Blast Furnaces
Application: Lining for blast furnace hearths, boshes, bellies, and lower furnace sections.
Performance Benefits:
High thermal conductivity facilitates stable slag skin formation, protecting the furnace lining.
Excellent resistance to ferroalloy erosion and infiltration withstands high-temperature scouring, extending furnace life.
Electric Furnaces
Application: Linings for electric furnace walls and hearths.
Performance Benefits:
Resists high-temperature arc radiation and molten steel erosion.
High electrical conductivity improves furnace efficiency by enhancing power transfer.
Non-Ferrous Metal Smelting Industry
Aluminum Electrolyzers
Role: Key lining material for aluminum electrolyzers.
Performance Benefits:
Resists erosion and penetration from high-temperature electrolytes.
Good electrical conductivity facilitates smooth electrolysis, reduces energy consumption, and extends service life while improving productivity.
Copper, Lead, Zinc Smelting Furnaces
Application: Linings for furnace bottoms and walls in non-ferrous metal smelting.
Performance Benefits:
Withstands erosion from various slags and molten metals.
Maintains furnace sealing and structural stability, extending operational cycles.
Chemical Industry Applications
Application: Linings for gas furnaces that endure high-temperature gas scouring and erosion.
Performance Benefits:
Excellent thermal insulation reduces heat loss and enhances thermal efficiency.
Application: Linings for high-temperature reactors (e.g., ammonia converters, calcium carbide furnaces).
Performance Benefits:
Resist high temperatures, pressure, and corrosion from aggressive gases or materials, ensuring reactor reliability.
Glass Industry Applications
Application: Linings for walls and bottoms of glass melting kilns.
Performance Benefits:
Resist erosion and scouring from high-temperature glass melts.
Minimize glass melt penetration, extending kiln life.
Maintain stable temperatures, enhancing glass quality.
Other Industrial Applications
Application: Linings for incinerators that must withstand high temperatures and corrosive gas erosion.
Performance Benefits:
Reduces wear and corrosion of the furnace structure.
Enhances operational stability and prolongs incinerator life.
Application: Linings for test furnaces that require stable high-temperature environments.
Performance Benefits:
High refractoriness and erosion resistance ensure accurate and reliable test results.
Why chooes us?
Customized dimensions and shapes
-
Customized Brick Shape
Provide Sample Sheets--Mold Opening & Quotation--Mold Opening & Sample Making--Bulk Production Quotation--Contract Signing--Bulk Production
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.
Customized packaging
-
Customize your brand
Logo customization, custom fonts, taglines and messages for packaging, signage, websites or printed materials.
Carbon Refractory Brick price is known to be a key factor influencing customers' purchase. Therefore, we offer affordable Carbon Refractory Bricks for sale. There are several reasons why ZINFON offers affordable Carbon Refractory Bricks:
factory price
By working with ZINFON, we ensure that our customers enjoy ex-factory prices for carbon refractory bricks. This allows customers to reduce the cost of middlemen or distributors. Allowing customers to get the most cost-effective pricing directly from the source. If you want to buy the cheapest refractory bricks, contact us today.
Low raw material costs
One of the key factors for the low price of carbon refractory bricks is the low cost of their raw materials.ZINFON is surrounded by abundant mineral resources. As a result, ZINFON has low production costs and high quality. With its high quality materials, customers can get affordable products with excellent performance.
mass production
ZINFON possesses advanced production equipment and technologies that enable the plant to realize economies of scale and reduce unit production costs. In addition, the large-scale production of carbon refractory bricks not only helps ZINFON to optimize its resources, but also ensures a continuous supply of high-quality products at favorable prices.
It is important to note that price is an important factor, but it should not be the only determining factor in your purchasing decision. Quality, reliability and technical support are equally important considerations when buying carbon refractory bricks from ZINFON.
Pre-sales 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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