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(Metallurgy) a hole in a furnace for running off molten metal or slag
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014



a hole in a blast furnace, steelmaking furnace, etc., through which molten metal or slag is tapped off.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
References in periodicals archive ?
This acquisition will allow Allied to increase its manufacturing presence in the Southeast, add taphole clay to its line of refractory products and expand its sales into the steel industry, The sale includes Riverside's Pell City, Alabama manufacturing operation, monolithic and pre-cast refractory shapes products, refractory coatings and mortars and high-alumina and anhydrous taphole clay products.
Depending on operating conditions, the mixture of molten iron and slag [4], which are continually tapped by the internal pressure of the blast furnace from the blast furnace hearth through a taphole, is separated by the density difference of fluids [5] in the downstream of main trough.
The crawler is launched through a 4-inch taphole drilled into the main using standard no-blow hot tap technology.
The Commission found that the tie-up would significantly impede effective competition in the European markets of phenolic resins for refractory bricks, shapes, and taphole clay (refractory materials).
Molten coal ash will flow out of a taphole in the bottom of the vessel and into a water-filled quench bath to become a solid slag that can be used as a building material.
Crude lead and discard slag are tapped continuously from this furnace through a single taphole and separated in a conventional forehearth.
When the molten aluminum reaches a certain volume, it flows continuously out of the taphole into a connected holding crucible, where it is stored.