Treatment of steel mill waste metal oxides
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United States of America Patent
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Sep 19, 2000
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N/A
app pub date -
Mar 25, 1998
filing date -
Mar 25, 1998
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Abstract
A process of recovering iron values and separating zinc oxides and other contaminants from steel mill waste metal oxides, such as blast furnace dust, BOF dust, mill scale and oily sludges, characterized by iron metallization levels up to 95% or more and zinc oxide removal in excess of 99%, and including the steps of blending the oxides with coke breeze in an amount sufficient to provide a total carbon content of 16% to 22%, the coke breeze having a particle size of 50% or more plus 60 mesh or larger, briquetting the blend to form briquettes having a thickness ranging from 1/2' to 3/4', and firing the briquettes in a rotary hearth furnace to metallize the iron and evolve zinc and other oxide contaminants.
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