| 摘要 |
<P>PROBLEM TO BE SOLVED: To control the pushing-away effect such that chromium ore having higher specific gravity pushes away silica having lower specific gravity by using the difference in grain sizes therebetween in a nozzle filler filled into the nozzle hole, e.g., of a sliding nozzle of a molten metal vessel and obtained by blending the silica and chromium ore, thereby eliminating the variation in sintering to increase the natural opening ratio of the nozzle hole. <P>SOLUTION: The nozzle filler is composed of a mixture of 50 to 70 wt.% chromium ore containing 40 to 55 wt.% Cr<SB>2</SB>O<SB>3</SB>and 30 to 50 wt.% silica containing ≥95 wt.% SiO<SB>2</SB>. The grain size index AFS of the chromium ore and silica is each 30 to 40, and the ratio (the grain size index AFS of the chromium ore)/(the grain size index AFS of the silica) is 0.90 to 0.92. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
