ALUMINA-MAGNESIA-BASED REFRACTORY BRICK AND METHOD FOR PRODUCING THE SAME

• Main Authors: YOSHIDA MASAHIRO, TOMITANI NAOSHI
• Format: Patent
• Language: English
• Published: 16.02.2012
• Subjects: ARTIFICIAL STONE; BLASTING; CEMENTS; CERAMICS; CHEMISTRY; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS; CONCRETE; DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS,IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KINDOF FURNACE; FURNACES; HEATING; KILNS; LIGHTING; LIME, MAGNESIA; MECHANICAL ENGINEERING; METALLURGY; OVENS; REFRACTORIES; RETORTS; SLAG; TREATMENT OF NATURAL STONE; WEAPONS

PROBLEM TO BE SOLVED: To provide an alumina-magnesia-based refractory brick which is excellent in residual expansibility, stress relaxation ability and slag infiltration resistance, required for ladles, particularly refractories for steel bath parts, and which restrains contamination of a molten steel by carbon, and to provide a method for producing the same.SOLUTION: In the method for producing the alumina-magnesia-based refractory brick, an alumina-based raw material and a magnesia-based raw material containing ≥90 mass% of a fine powder having a grain size of ≤0.5 mm are used, wherein the total amount of AlOand MgO as chemical components is ≥85 mass%, MgO is 4-20 mass%, SiOis 0.5-5 mass%, the total amount of NaO and KO is 0.3-2 mass%, and C is ≥0.5 and <7 mass%. The production method is characterized by mixing/kneading the raw materials, press molding the obtained kneaded material, and heating the resulting molding for treatment within the temperature range of 100-1,150°C.