Abstract

Basic-oxygen furnaces are rapidly replacing open-hearth furnaces. A byproduct of the basic-oxygen process is a high tonnage of flue dust which consists of very fine iron oxide particles with small quantities of nonferrous impurities. A current problem within the steel industry is the profitable use of this by-product material. One possibility is to agglomerate the flue dust on a sintering machine and return it to the steel-making system. The utilization of flue dust from the basic-oxygen process as a blast furnace sinter requires that the nonferrous metal content be controlled. A major impurity is zinc, which originates from galvanized scrap fed directly into the basic-oxygen furnace. The presence of zinc in sinter is destructive to the blast-furnace lining and shell. For the rapid determination of zinc in both flue dust and sinter, x-ray fluorescence spectroscopy has been successfully used.

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