silica castable refractories and silica quality precast block refractory

摘要

PROBLEM TO BE SOLVED: To provide a silica-based castable refractory which has excellent thermal shock resistance during heating, suppresses shrinkage under load at high temperatures, exhibits good creep resistance at high temperatures, and hardens within a proper time.;SOLUTION: A silica-based castable refractory is obtained by adding, to 100 mass% of a silica-based refractory raw material mixture comprising fused quartz and fired silica stone, 3.0-9.3 mass% (expressed in terms of solid SiO₂) of colloidal silica and 0.04-0.30 mass% (expressed in terms of solid Na₂O) of sodium silicate. The fired silica stone consists mainly of tridymite, blending percentages of fused quartz and fired silica stone are 40-100 mass% of fused quartz and 0-60 mass% of fired silica stone, and a total addition amount of sodium components is 0.06-0.32 mass% (expressed in terms of solid Na₂O) externally relative to 100 mass% of the composition. The fired silica stone may consist mainly of tridymite and cristobalite. In this case, blending percentages of fused quartz and fired silica stone are set to 60-100 mass% of fused quartz and 0-40 mass% of fired silica.;COPYRIGHT: (C)2013,JPO&INPIT