Blast-furnace blowing coal and method for producing same
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United States of America Patent
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Apr 18, 2017
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app pub date -
Apr 25, 2013
filing date -
Aug 13, 2012
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Abstract
A method for producing blast-furnace blowing coal to be blown through a tuyere into the interior of the blast-furnace body of a blast furnace, wherein: the composition and melting point of the ash from the coal are analyzed in advance; the composition of the blast-furnace slag is analyzed in advance; the blast-furnace slag contains more calcium oxide than the coal ash does; and the coal and the blast-furnace slag are mixed, on the basis of the composition and melting point of the coal ash and the composition of the blast-furnace slag, and in a manner such that the amount of calcium oxide contained in a quaternary system phase diagram including silicon dioxide, magnesium oxide, aluminum oxide and calcium oxide, which are the principal components of the coal ash and the blast-furnace slag, causes the melting point of the ash to be 1400° C. or higher.
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