A Brief Introduction of Ladle Ramming Mass
2025-10-28
Ladle ramming mass is a refractory material used for ladle lining. Produced through a ramming process, it boasts high-temperature and corrosion resistance and is widely used in industries such as metallurgy and steelmaking.
Composition and Properties
Ladle ramming mass typically consists primarily of magnesium oxide (MgO), supplemented with additives such as chromium oxide (Cr₂O₃). It exhibits high refractoriness (reaching temperatures exceeding 1600°C) and strong corrosion resistance. For example, the MgO-Cr₂O₃ ramming material for VOD ladle safety linings has a chemical composition of ≥60% MgO and ≥4.0% Cr₂O₃, making it suitable for furnaces smelting metals such as copper, nickel, and lead.
Applications
It is primarily used for lining ladle refining equipment, such as medium-frequency furnaces and VOD units, which must withstand high-temperature molten steel and chemical corrosion. For example, ramming material is used in the riser pipes of RH vacuum degassing units and key areas of AOD refining equipment.
Construction and Maintenance
During construction, the raw materials are mixed according to the particle size ratio (e.g., 45-55% for 4-1mm particles and 25-35% for 1-0.074mm particles). The material is then formed by ramming. During use, the lining thickness must be regularly checked (e.g., the permanent layer should be maintained at 120-130mm), and worn areas must be promptly repaired.
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