Blast Furnace Iron Runners Refractory Castables are specialized monolithic refractory materials developed for blast furnace ironmaking systems. They are manufactured using brown fused alumina as the main raw material, combined with silicon carbide, carbonaceous materials, clay, high alumina cement, ultrafine powders and performance-enhancing additives.
These castables are designed to withstand the severe operating conditions found in blast furnace iron runners, where refractory linings are continuously exposed to high-temperature molten iron, slag erosion, chemical corrosion and mechanical wear. Their dense structure and high mechanical strength help protect the working lining and maintain stable iron and slag flow during tapping operations.
Depending on the application, different formulations can be selected for main iron runners, main runner slag lines, secondary iron runners, slag runners and tilting runners. The optimized combination of alumina, silicon carbide and carbon-containing materials helps improve resistance to molten iron penetration, slag attack and surface erosion.
In addition to their high-temperature performance, Blast Furnace Iron Runners Refractory Castables offer good workability, favorable gas permeability and fast-drying characteristics when properly installed and dried according to the recommended procedure. These properties help reduce installation downtime and support reliable lining performance in continuous ironmaking operations.
Technical Specifications
Parameter | ASC-1 | ASC-2 | ASC-3 | ASC-4 | ASC-5 | ASC-6 |
|---|---|---|---|---|---|---|
Al₂O₃ Content (%) | 70 | 53 | 60 | 48 | 48 | 60 |
SiC + C Content (%) | 12 | 25 | 16 | 10 | 17 | 10 |
Bulk Density at 110°C × 24h (g/cm³) | 2.9 | 2.8 | 2.7 | 2.4 | 2.4 | 2.7 |
Bulk Density at 1450°C × 3h (g/cm³) | 2.85 | 2.75 | 2.65 | 2.35 | 2.35 | 2.65 |
Permanent Linear Change at 1450°C × 3h (%) | ±0.3 | ±0.3 | ±0.5 | ±0.5 | ±0.5 | ±0.5 |
Cold Crushing Strength at 110°C × 24h (MPa) | ≥20 | ≥18 | ≥20 | ≥15 | ≥15 | ≥20 |
Cold Crushing Strength at 1450°C × 3h (MPa) | ≥30 | ≥25 | ≥40 | ≥30 | ≥30 | ≥40 |
Typical Application | Main runner iron line | Main runner slag line | Main runner | Iron runner | Slag runner | Tilting runner |
Key Features
- High Temperature Resistance: Designed to withstand the extreme thermal conditions encountered during blast furnace tapping and molten iron transportation.
- Excellent Erosion Resistance: The combination of brown fused alumina, silicon carbide and carbonaceous materials helps resist erosion caused by high-velocity molten iron and slag.
- Strong Slag Corrosion Resistance: Formulated to improve resistance to chemical attack from molten slag, helping protect the working lining during repeated tapping cycles.
- High Bulk Density: A dense refractory structure helps reduce molten iron and slag penetration when the material is properly installed and dried.
- High Mechanical Strength: Provides resistance to abrasion and mechanical wear under demanding iron runner operating conditions.
- Reduced Slag Adhesion: The optimized refractory composition helps limit slag adhesion and facilitates cleaning and maintenance.
- Good Workability: Suitable for castable installation methods, allowing the material to be placed and shaped according to the runner design.
- Fast Drying Performance: Properly formulated grades can support efficient drying and shorter baking schedules when used with an approved heating procedure.
- Good Gas Permeability: Designed to facilitate gas release during drying, helping reduce the risk of internal pressure buildup.
- Longer Lining Service Life: Appropriate grade selection and installation help improve lining durability and reduce the frequency of refractory repairs.
Typical Applications of Molten Iron Ladles Refractory Castables
Blast Furnace Iron Runners Refractory Castables are primarily used to construct, repair and maintain refractory linings in blast furnace ironmaking systems.
Typical applications include:
- Main Iron Runner Iron Lines: Protecting the primary flow channel that carries molten iron away from the blast furnace.
- Main Runner Slag Lines: Providing resistance to slag erosion and chemical corrosion in areas exposed to molten slag.
- Secondary Iron Runners: Maintaining the refractory lining of channels used to transport molten iron.
- Slag Runners: Protecting channels that carry high-temperature slag during blast furnace tapping.
- Tilting Runners: Providing refractory protection for tilting runner systems used in molten iron and slag handling.
- Blast Furnace Tapping Channels: Supporting continuous molten iron discharge under severe thermal and chemical conditions.
- Runner Repair and Maintenance: Rebuilding worn sections and restoring the protective refractory lining during scheduled maintenance.
Different runner sections experience different combinations of molten iron flow, slag contact, thermal cycling and mechanical wear. Selecting the appropriate castable grade for each section helps optimize refractory performance and operating costs.
Production Details
- Raw Materials: Brown fused alumina serves as the primary refractory aggregate, with silicon carbide, carbonaceous materials, clay and high alumina cement added according to the required formulation.
- Particle Grading: Multiple particle sizes are proportioned to improve packing density and support the development of a stable refractory structure.
- Ultrafine Powders: Selected fine powders help optimize the matrix structure and improve the physical properties of the castable.
- Additive Technology: Appropriate additives are incorporated to adjust workability, setting behavior, drying characteristics and overall performance.
- Mixing and Proportioning: Raw materials are accurately weighed and mixed to maintain consistent chemical composition and product quality.
- Quality Control: Testing can include chemical composition, bulk density, cold crushing strength, permanent linear change and other specified physical properties.
- Grade Selection: Formulations are adjusted according to the requirements of main iron lines, slag lines, secondary runners and tilting runners.
Packing and Shipping Details
- Standard Packaging: Moisture-resistant bags, with 25 kg per bag available upon confirmation.
- Bulk Packaging: Jumbo bags or other bulk packaging can be arranged according to project requirements.
- Storage Conditions: Store in a dry, well-ventilated warehouse and protect the material from moisture.
- Moisture Protection: Keep the packaging sealed until use to help preserve setting and installation properties.
- Shipping Methods: Sea freight, rail transport and truck delivery, depending on destination and logistics requirements.
- Delivery Form: Dry castable refractory material ready for onsite mixing with the specified amount of water.
- Packaging specifications, palletization and delivery arrangements can be confirmed according to order quantity and destination.
Frequently Asked Questions (FAQ)
Q1: What are Blast Furnace Iron Runners Refractory Castables?
Blast Furnace Iron Runners Refractory Castables are monolithic refractory materials used to line and repair channels that transport molten iron and slag from blast furnaces. They are typically made from brown fused alumina, silicon carbide, carbonaceous materials, binders and functional additives.
Q2:What materials are used in iron runner castables?
The main materials include brown fused alumina, silicon carbide, carbonaceous materials, clay, high alumina cement, ultrafine powders and additives. Their proportions vary according to the required performance and application.
Q3. What is the Al₂O₃ content of these castables?
The typical Al₂O₃ content ranges from 48% to 70%, depending on the grade. The appropriate alumina content is selected according to the operating conditions and the requirements of the runner section.
Q4: What are the main applications of iron runner refractory castables?
They are used in main iron runners, main runner slag lines, secondary iron runners, slag runners and tilting runners. They are also suitable for repairing worn refractory sections in blast furnace tapping systems.
Q5: Can different grades be selected for different runner sections?
Yes. Different grades can be selected for iron lines, slag lines, main runners and tilting runners according to local temperature, flow velocity, slag exposure and wear conditions.
Q6: Can Blast Furnace Iron Runners Refractory Castables be customized?
Yes. Formulations can be adjusted according to the runner design, operating temperature, molten iron flow, slag composition, installation method, drying requirements and target service life.
