Patent · US Expired

Apparatus for the direct reduction of iron ore to sponge iron

US4062529A · kind A · utility

5Cited by

5References

5Claims

0Family size

Assignee

Thyssen Purofer GmbH

Inventors

Klaus Altenhoner
Walter Jansen · Mülheim an der Ruhr, DE
Klaus Knop · Geldern, DE
Jan G. Reering · Rio de Janeiro, BR

Key dates

Filing date	Dec 17, 1975
Grant date	Dec 13, 1977
Priority date	—
Expiry date	Dec 17, 1995

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY02P10/134
WIPO fieldMaterials, metallurgy
WIPO sectorChemistry

Abstract

In a shaft furnace for the direct reduction of iron ore in which hot reducing gas is introduced at the bottom of the furnace and removed from the top of the furnace, means for recirculating at least a portion of the furnace exhaust gas are provided along with means for introducing fresh gas into the recirculated gas stream and means to heat the gas stream introduced into the furnace. The improvement comprises providing means for desulfurizing the fresh gas stream prior to its joining the recycled exhaust gas and providing for dust removal, sulfur and CO removal in the recycled gas stream prior to its joining the fresh gas stream.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.