BLAST-FURNACE BLOWING COAL AND METHOD FOR PRODUCING SAME

摘要

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.

主权项

1. Blast-furnace injecting coal which is injected through a tuyere into an interior of a blast-furnace body of a blast furnace;
a composition and a melting point of coal ash being analyzed in advance and a composition of iron and steel slag produced by an iron and steel production step being analyzed in advance; the iron and steel slag containing more calcium oxide than the coal ash does; and the coal and the iron and steel slag being mixed, on the basis of the composition and melting point of the coal ash and the composition of the iron and steel slag, and in a manner such that a content of calcium oxide contained in a quaternary system phase diagram including silicon dioxide, magnesium oxide, aluminum oxide and calcium oxide, which are principal components of the coal ash and the iron and steel slag, causes the melting point of the ash to be 1400° C. or higher.