Filler sand for a ladle tap hole valve
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United States of America Patent
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app pub date -
Nov 20, 2001
filing date -
May 27, 1999
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Abandoned
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Abstract
A filler sand for a ladle tap hole valve contains 45 to 55 mass % of zircon sand, 30 to 40 mass % of chromite sand and 10 to 20 mass % of silica sand and is blended externally with 0.05 to 5 mass % of carbon black calculated based on the total amount of the sands; or contains 30 to 90 mass % of chromite sand and 10 to 70 mass % of silica sand and is optionally blended externally with 0.05 to 5 mass % of carbon black, wherein 95 mass % or more of the chromite sand consists of particles having diameters falling within a range of 150 to 850 .mu.m, 60 mass % or more of the chromite sand consists of particles having diameters falling within a range of 212 to 600 .mu.m, 95 mass % or more of the silica sand consists of particles having diameters falling within a range of 300 to 1180 .mu.m, and 90 mass % or more of the silica sand consists of particles having diameters falling within a range of 600 to 1180 .mu.m.
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