Ground Granulated Blast Furnace Slag (GBFS)
Ground Granulated Blast Furnace Slag (GBFS) is a non-metallic, glassy, granular material formed when molten iron slag (a byproduct from the blast furnace in iron making) is rapidly quenched with water or steam. This rapid cooling prevents crystallization, resulting in a vitreous (glassy) material with latent cementitious properties (the ability to harden when activated).
When GBFS is dried and finely ground, it is known as Ground Granulated Blast Furnace Slag (GGBFS). Its primary composition is a complex calcium aluminosilicate, similar to volcanic ash, which makes it a highly effective pozzolanic material and a source of key oxides (CaO, SiO₂, Al₂O₃) for metallurgical adjustments.
Main Function and Characteristics
GBFS is used as an inert, high-temperature raw material source and as a partial replacement for cement in construction due to its latent binding ability.
| CHARACTERISTIC | VALUE RANGE | PRIMARY METALLURGICAL FUNCTION |
|---|---|---|
| Composition | CaO–MgO–Al₂O₃–SiO₂ | Provides basic and amphoteric oxides for slag manipulation. |
| State | GLASSY/AMORPHOUS | Critical for pozzolanic and cementitious activity. |
| Fineness | ULTRA-FINE (when ground) | Necessary to activate the latent binding potential. |
CLASSIFICATION
- Chemistry Focus: Industrial Byproduct / Flux – Complex Calcium Aluminosilicate
- Primary Application Focus: Slag Conditioner, Cement Replacement (GGBFS), and Raw Material for High-Grade Ceramics
Key Performance Metrics
| PROPERTY | TYPICAL PERFORMANCE | MECHANISM OF ADVANTAGE |
|---|---|---|
| Slag Adjustment | EXCELLENT | Used to increase the volume of the refining slag or adjust its basicity/fluidity. |
| Alkali Resistance | HIGH | Improves the durability and service life of construction materials (GGBFS use). |
| Environmental | HIGH | Utilizing a byproduct minimizes waste and reduces the CO₂ footprint of cement production. |
- Role as a Slag and Fluxing Agent (Raw Materials Menu)
In its granular or pre-ground form, GBFS is used directly in subsequent metallurgical processes:
- Slag Volume and Cover: It can be added to the ladle or tundish to increase the slag layer’s volume and thickness, which provides thermal insulation and acts as a chemical blanket to protect the molten metal from re-oxidation by the atmosphere.
- Basicity and Fluidity: The CaO and MgO content contributes to the slag’s basicity, while the SiO₂ and Al₂O₃ content influences its viscosity (fluidity). It is a cost-effective way to condition the steelmaking slag.
- Role in Cementitious Systems (GGBFS)
When ground (GGBFS), it is used as a supplementary cementitious material (SCM), often replacing 25% to 80% of Portland Cement.
- Pozzolanic Activity: GGBFS reacts slowly with the calcium hydroxide produced by the hydration of Portland cement. This reaction creates additional strong Calcium Silicate Hydrate (C-S-H) compounds, which increase the final strength, reduce porosity, and significantly enhance the resistance of the concrete/castable to chemical attack (chloride and sulfate corrosion).
- Technical Guidance
- Activation: GBFS is not hydraulically active on its own. It requires an activator (like Ca(OH)₂ from Portland Cement or CAC) or a chemical alkali to initiate its hardening reaction.
- Contamination: For use in high-purity refractories or ceramics, the relatively high Fe₂O₃ content in GBFS typically limits its use to lower-cost, lower-duty applications.
✨ Customization Services
We offer product customization services, allowing you to tailor the appearance, dimensions, or specific markings of items like refractory shapes or bricks. This includes options for incorporating specific geometric requirements to ensure seamless integration into your process systems.
🔬 Sampling for Testing & Validation
Free product samples are available for thorough testing and validation. This allows you to confirm the quality, compatibility, and performance of our materials—such as specific bricks, castables, or raw materials—before committing to a full order.
💡 Expertise in Refractory Solutions
Leverage our deep expertise to receive detailed, application-specific refractory solutions. We move beyond just selling products by providing comprehensive plans that encompass material selection, installation guidance, and performance optimization to maximize the lifespan and efficiency of your high-temperature processes.
Rabatec products are exclusively manufactured in facilities that have achieved rigorous ISO certifications across Quality (ISO 9001), Environmental Management, and Occupational Health & Safety. This commitment ensures every product, from refractory bricks to specialized equipment, meets the highest global benchmarks for performance, sustainability, and workplace safety.
📦 Logistics Excellence: Shipping, Packaging, and Marking
Minimizing Risk: We manage all logistics to minimize handling touchpoints and transit shock. Our carriers are pre-vetted for their experience in transporting heavy, fragile, and sensitive industrial materials.
Traceability: Every shipment includes comprehensive documentation and tracking information, providing end-to-end visibility and ensuring precise delivery coordination for your site.
Protection is Paramount: Our packaging strictly follows industry standards to prevent damage, corner chipping, and moisture absorption—especially critical for materials like Basic Refractory Bricks and Refractory Mortars & Mixes.
Robust Palletization: Products are secured on fumigated, high-strength export pallets (e.g., 1100x950mm or similar sturdy dimensions) using heavy-duty strapping and durable protective wrapping (polyethylene sheeting, cardboard, etc.) to withstand long-distance travel and multiple loadings.
Moisture Control: Sensitive materials are protected with appropriate sealing and, where necessary, desiccants or moisture-vapor proof enclosures to maintain the product's integrity until installation.
Clear Identification: All outer packaging is clearly marked on multiple sides with large, legible text for immediate identification and safe handling.
Full Traceability: Markings include all essential data points: Product Name, Quality Grade, Batch Number, Quantity, Net/Gross Weight, Order Number, and the Final Destination/Construction Area. This ensures every pallet can be accounted for and correctly staged upon arrival.
Safety & Compliance: We adhere to all regulatory requirements for marking, labeling, and placarding—especially for any items classified as Dangerous Goods—to ensure full compliance with international and domestic transport regulations.
❓ Frequently Asked Questions (FAQ)
Question | Elaborated Answer |
Q: What is the Refractoriness Under Load (RUL) of your refractories? | A: Refractoriness Under Load (RUL) is a critical property that defines the maximum temperature our materials can withstand while under compressive stress before deforming (softening). Since we offer a wide range of materials—from Alumina-Silicate Bricks to high-performance Silicon Carbide Bricks—the RUL varies significantly. For specific product data, please refer to the product data sheet or submit a quote request for the material you are interested in. |
Q: Where are the Rabatec refractories and materials produced? | A: Our products are primarily sourced from specialized manufacturing plants in China. Crucially, these facilities have all undergone rigorous audits and achieved comprehensive ISO certifications (Quality, Environment, and Safety), ensuring that production adheres to the highest global standards for consistency and performance. |
Q: What refractory materials does the company offer? | A: We supply a comprehensive portfolio of advanced refractory solutions, including: Shaped Products: Alumina & Silica Bricks, Basic & Specialized Bricks (e.g., Magnesia), SiC & Structural Ceramics, and Precast Shapes. Monolithic Products: Refractory Castables, Mixes & Mortars. Insulation: Insulation Fibre and High-Performance Insulation Products. |
Q: How should I choose the appropriate refractory material for my application? | A: Selecting the correct refractory is paramount to process efficiency. The choice depends on three key factors: 1. Operating Environment: Maximum process temperature and thermal cycling (shock). 2. Chemical Attack: Type of slag, molten metal, or corrosive gas being handled (acidic, neutral, or basic). 3. Mechanical Stress: Abrasion, erosion, and static load requirements. We recommend utilizing our detailed refractory solutions service to consult with our engineers for an optimized, application-specific recommendation. |
Q: Which monolithic material should I choose when patching an existing lining? | A: For patching and minor repairs, the ideal monolithic material depends on the parent lining material, the patching depth, and the need for a rapid return to service. Common choices include: Refractory Mortars & Mixes (for minor joints/surfaces) or Plastic Refractories (for areas requiring physical compaction). Always choose a patch material chemically compatible with the existing lining to ensure proper bonding and service life. |
Q: Can I receive product samples before placing a major order? | A: Yes. We gladly provide product samples for your internal testing and validation purposes. This ensures you can confirm the quality, composition, and fit of the material—such as our Refractory Castables or Alumina-Silicate Bricks—in your specific operational environment before committing to a bulk purchase. |
Q: Do you provide certifications to verify material quality? | A: Absolutely. We provide product-related inspection certificates and quality assurance documentation upon request. This verifies that your order has passed all internal quality control checks and meets the required material specifications and industry standards. |
Q: What measures are taken for product protection during transport? | A: We ensure quick, reliable transport by using robust, industrial packaging that strictly follows industry standards. This includes high-strength palletization, heavy-duty strapping, and weather-resistant wrapping to protect fragile items like bricks and mixes from corner chipping, mechanical damage, and moisture during transit. |
