METHOD FOR PRODUCING GRANULAR METALLIC IRON
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United States of America Patent
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Issued Date -
Feb 3, 2011
app pub date -
Apr 6, 2009
filing date -
Apr 9, 2008
priority date (Note) -
Abandoned
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Abstract
A method for producing granular metallic iron by heating and reducing a raw material mixture which includes an iron oxide-containing material, a carbonaceous reductant and a Li.sub.2O supplying material in a thermal reduction furnace, wherein the iron oxide-containing material includes a hematite-containing material, and the raw material mixture includes at least Fe, Ca, Mg, Si and Li as constituent elements in such a manner that slag which forms as a by-product during heating and reduction contains CaO, MgO, SiO.sub.2 and Li.sub.2O, has a Li.sub.2O content of 0.05% by mass or more, and the slag has a basicity [(CaO+MgO)/SiO.sub.2] in a range of from 1.5 to 1.9. This method enables granular metallic iron to be produced at a high productivity even when a hematite-containing material is used as the iron oxide-containing material.
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