Hole-opening bit and tap hole opening method using same
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United States of America Patent
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-
Nov 21, 2023
Grant Date -
N/A
app pub date -
Mar 10, 2020
filing date -
Mar 19, 2019
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A hole-opening bit that can simplify an operation for opening a tap hole for installing a burner lance for raising the temperature of a furnace bottom of a blast furnace, which allows the blast furnace to be started up in a relatively short time after long-time blast stoppage or after a furnace cooling accident, by efficiently heating the furnace bottom, and a tap hole opening method using the hole-opening bit. A hole-opening bit used to open the tap hole in the furnace bottom of the blast furnace including chips on rear surfaces of a furnace drilling surface of the hole-opening bit such that outermost ends of the chips are located inside of an outermost end of the hole-opening bit.
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