SPINEL-ALUMINA-CARBON BRICK FOR VACUUM DEGASSING APPARATUS AND VACUUM DEGASSING APPARATUS

• Main Authors: TSUTSUI YUJI, HARADA JUNJI, YAMAUCHI JUN, HASHIMOTO KAZUMI
• Format: Patent
• Language: English; Japanese
• Published: 31.03.2022
• 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

To provide a spinel-alumina-carbon brick having excellent corrosion resistance to slag generated in a vacuum degassing apparatus and also having excellent thermal shock resistance, magnesia-carbon reaction resistance, and oxidation resistance, and a vacuum degassing apparatus using thereof for a lower vessel wall.SOLUTION: A spinel-alumina-carbon brick containing 13 mass% or over and 70 mass% or under of spinel, 1 mass% or over and 70 mass% or under of alumina, 3 mass% or over and 15 mass% or under of graphite, and 0.1 mass% or over and 2.0 mass% or under of aluminum and/or aluminum alloy, is lined to a lower vessel side wall of a vacuum degassing apparatus for performing operations involving an operation, conducted at a rate of 80% or over of operation opportunities of one furnace, of adding aluminum as a deoxidation material in a vessel, the operation satisfying the formula (2). 0.10≤average in-vessel slag index [-]≤0.30 (2)SELECTED DRAWING: Figure 2 【課題】真空脱ガス装置内で発生するスラグに対して耐食性に優れ、さらに耐熱衝撃性、耐マグネシア－カーボン反応性、耐酸化性に優れるスピネル－アルミナ－カーボン煉瓦及びこれを下部槽壁に使用した真空脱ガス装置を提供する。【解決手段】スピネルを１３質量％以上７０質量％以下、アルミナを1質量％以上７０質量％以下、黒鉛を３質量％以上１５質量％以下、並びにアルミニウム及び／又はアルミニウム合金を０．１質量％以上２．０質量％以下含有するスピネル－アルミナ－カーボン煉瓦を、脱酸材としてアルミニウムを槽内で添加することを含む操業を１炉代の操業機会あたり８０％以上実施する操業であって下記（２）を満たす操業を行う真空脱ガス装置の下部槽側壁にライニングする。０．１０≦平均槽内スラグインデックス［－］≦０．３０ （２）【選択図】図２