Monothilic refractory composition
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United States of America Patent
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Jan 23, 2007
Grant Date -
Nov 17, 2005
app pub date -
May 8, 2002
filing date -
Feb 9, 2001
priority date (Note) -
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Abstract
A subject for the invention is to provide an unshaped refractory composition having not only high thermal resistance but also improved corrosion resistance and improved unsusceptibility to slag infiltration.The invention is 'an unshaped refractory composition comprising: (1) 20 to 70% by weight raw spinel material comprising an MgO--Al.sub.2O.sub.3 spinel phase and containing 2 to 20% by weight magnesia and/or raw spinel/corundum material comprising an MgO--Al.sub.2O.sub.3 spinel phase and a corundum phase and containing 2 to 20% by weight magnesia; (2) 3 to 12% by weight raw magnesia material having a particle diameter of 0.3 mm or smaller, containing particle sizes of 75 .mu.m or smaller in an amount of 55 to 85% by weight, and having a magnesia purity of 90% by weight or higher; (3) 3 to 10% by weight alumina cement having a calcia content lower than 20% by weight; (4) 0.3 to 1.5% by weight ultrafine powder consisting mainly of silica; and (5) a raw alumina material as the remainder'.
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