SILICA CASTABLE REFRACTORY AND SILICA PRECAST BLOCK REFRACTORY

• Main Authors: TAKENAMI JUNYA, NISHIHARA JUN, ENDO YOSHIYASU
• Format: Patent
• Language: English; Japanese
• Published: 14.04.2016
• 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 a silica castable refractory excellent in thermal shock resistance during heating, having suppressed shrinkage under load at high temperature, good in creep resistance at high temperature, hardening in appropriate time and capable of being flow molding easily even when being a large molded body.SOLUTION: There is provided a silica castable refractory by adding Portland cement of 0.7 to 2 mass%, a water-reducing agent of 0.03 to 0.3 mass%, sodium silicate of 0.04 to 0.30 mass% in terms of NaO, by outer multiplication, based on 100 mass% of a silica refractory raw blended article consisting of molten quartz, crystalline silica consisting of cristobalite and quartz and silica superfine powder. There is provided a silica castable refractory which has blended ratio of the silica refractory raw material blended article of the molten quartz of 96 to 70 mass%, the crystalline silica consisting of cristobalite and quartz of 0 to 20 mass% and the silica superfine powder of 3.8 to 10 mass%, and may contain burnt silica of 10 mass% or less as a part of the silica refractory raw material blended article.SELECTED DRAWING: None 【課題】加熱時の熱衝撃抵抗性に優れ、高温での荷重下収縮が抑制され、高温下での耐クリープ性が良好で、適切な時間内で硬化し、大型成形体であっても容易に流し込み成形可能な珪石質キャスタブル耐火物の提供。【解決手段】溶融石英と、クリストバライト及びクオーツからなる結晶質シリカと、シリカ質超微粉からなる珪石質耐火原料配合物１００質量％に対して、外掛けでポルトランドセメントを０．７〜２質量％、減水剤を０．０３〜０．３質量％、珪酸ソーダをＮａ２Ｏに換算して０．０４〜０．３０質量％添加した珪石質キャスタブル耐火物。前記珪石質耐火原料配合物の配合割合が、溶融石英９６〜７０質量％、クリストバライト及びクオーツからなる結晶質シリカ０〜２０質量％、シリカ質超微粉３．８〜１０質量％であり、珪石質耐火原料配合物の一部として焼成珪石を１０質量％以下含み得る珪石質キャスタブル耐火物。【選択図】なし