Ramming Mass – MgO
Main Chemical Compositions & Categories
MgO Ramming Mass consists predominantly of high-purity Magnesia (Periclase) aggregate. Since MgO is chemically inert, the bonding mechanism is crucial; it is generally bonded by chemical additives (inorganic or organic like resins/pitch) that facilitate high-density sintering upon initial heating.
| COMPONENT | CONTENT | CHEMICAL BASE | PRIMARY ADVANTAGE |
| Aggregate | MgO (90% to 98%) | Dead-burned or Fused Magnesia | Basicity, extreme refractoriness |
| Binder | Inorganic / Organic Additives | Boric Acid, Resin/Pitch | Facilitates high-density sintering and hot strength |
| VARIANT | BINDER TYPE | APPLICATION NOTE |
| Dry Vibratable | Minimal Inorganic Bond | Used for cold installations in induction furnaces (CIF) |
| Chemically Bonded | Resin/Pitch/Tar | Used for hot installations or where high-strength coke bond is desired |
Key Properties and Performance
| PROPERTY | TYMPICAL PERFORMANCE | MECHANISM OF ADVANTAGE |
| Chemical Resistance | EXCELLENT (Basic) | Highly stable against CaO– and MgO-saturated basic slags in steelmaking. |
| Refractoriness Under Load (RUL) | EXTREME | MgO has a melting point of 2800°C, ensuring structural stability above 1800°C. |
| Installation Density | VERY HIGH | Intensive ramming or vibration achieves minimal porosity, inhibiting slag penetration. |
| Volume Stability | EXCELLENT | Designed to achieve minimal shrinkage or expansion after sintering. |
Advantages and Key Characteristics
MgO Ramming Mass is essential for furnace areas that require the highest level of chemical resistance against basic slags and maximum thermal stability under extreme temperature conditions.
- Maximum Slag Resistance: As a basic refractory, MgO is chemically compatible with basic slags. It resists chemical dissolution and penetration, which is critical in maintaining the integrity of the working lining in steelmaking vessels.
- Monolithic and Joint-Free: Ramming creates a seamless lining, eliminating the weak points (joints) inherent in brick linings that are susceptible to slag attack, metal penetration, and erosion.
- Controlled Sintering: The composition is engineered to form a strong, dense hot face (“sintered layer”) upon initial heating, while the backing layer remains unfired, providing a cushion and making tear-out easier at the end of the campaign.
- Customized Shape: Particularly vital for coreless induction furnaces (CIF), where the ramming mix is packed around a metal former (the coil protector), creating a perfectly customized crucible shape directly against the coil.
Typical Industries and Applications
This product is specialized for basic metallurgical processes:
- Ferrous Industry (Steel): Hearth lining of Electric Arc Furnaces (EAF), lining of EAF spouts, bottoms of Ladle Furnaces (LF), and lining the crucible of Coreless Induction Furnaces (CIF) melting basic-slag-forming steels.
- Non-Ferrous Industry: Specialized applications requiring basic resistance, such as certain refining vessels.
Furnace Areas and Service Zones
They are specified for structural, high-temperature, and chemical-contact areas:
- EAF/LF HEARTHS: The bottom of the furnace, where the metal pool rests and slag contact occurs.
- CIF CRUCIBLES: The primary working lining that contains the molten charge.
- MAGNESIA BRICK BACKUP: Used to fill gaps or uneven surfaces behind basic brick lining.
Key Data Sheet Properties to Consider
Selection criteria focus on purity, density, and binding mechanism:
- MgO Purity: CRITICAL VALUE. Must be high (> 90%) for maximum refractoriness and slag resistance. Low SiO2 content is necessary.
- Installation Density: Look for the required Rammed/Vibrated Bulk Density (BD) (e.g., > 2.8 g/cm3) to confirm that proper installation yields minimal porosity.
- Sintering Curve: Check the temperature required to achieve the necessary sintered hot face.
- Maximum Service Temperature (MST): Must be rated for the operating temperature of the furnace (typically 1700°C to 1850°C).
Technical Guidance: Successful installation is entirely dependent on achieving the specified installation density through proper ramming or vibration. For CIF applications, a slow, controlled initial heat-up with a metal plug/scrap charge is required to safely sinter the working face and prevent material washout. This material is highly susceptible to attack by acidic slags and must not be used in such environments.
✨ 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. |
