Rammed (compactible) silica mass is a refractory material with a high silica content that is used for lining and repairing induction furnaces, blast furnaces, and metal melting units. By ramming or pressing it into place, this mass forms a dense and durable layer. Its main characteristics are high thermal resistance, chemical stability against molten metal and slag, and controlled thermal expansion. Easy application, good compactability, and increased service life of equipment are important advantages of this mass in the metal industries.
Rammed silica mass is a monolithic refractory based on high-purity quartz, combined with special additives to promote sintering. This material is applied in a dry form by ramming, and during the initial heating, its binder is activated, forming a dense ceramic layer that is impermeable to molten metal. High mechanical strength at operating temperatures, stability against thermal shock, and its economic cost make it an unrivalled choice for lining induction furnaces used in steel and cast iron melting, while also extending furnace service life.
Rammed silica masses are a category of monolithic refractories that are compacted in dry form—without the need for added water—through ramming or vibration. Their unique feature lies in the initial firing process, where heat generates a strong, low-porosity ceramic layer at the contact surface with the molten metal, while the backing layers retain a more porous and insulating structure. This dual-layer system ensures low thermal conductivity, preventing energy loss while blocking metal penetration and refractory wall corrosion. These masses also exhibit outstanding chemical resistance against acidic slags rich in oxides of iron, silicon, aluminium, and chromium. For this reason, they are widely used in the lining of induction furnaces, molten metal ladles, and tundishes as a cost-effective and high-performance solution to extend equipment service life.
Silica ramming masses, with controlled thermal expansion and high chemical stability, not only withstand extreme operating temperatures but also prevent destructive reactions with molten metal and slag. This key property protects furnace linings from cracking and erosion, ensuring a dense and impermeable structure. These characteristics make them the ideal choice for induction furnace linings, significantly reducing repair time and costs.
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| Grain Size | Loss of Ignition % | Na₂O % | K₂O % | MgO % | CaO % | Fe₃O₄ % | Fe₂O₃ % | Al₂O₃ % | SiO₂ % |
|---|---|---|---|---|---|---|---|---|---|
| 0–6 mm | <0.05 | <0.03 | <0.07 | <0.05 | <0.2 | <0.2 | <0.2 | <0.3 | 98 |
