PROCESS FOR PRODUCING SPONGE IRON BY DIRECT REDUCTION OF IRON OXIDE-CONTAINING MATERIALS
PCT No. PCT/AT97/00236 Sec. 371 Date Sep. 30, 1998 Sec. 102(e) Date Sep. 30, 1998 PCT Filed Nov. 5, 1997 PCT Pub. No. WO98/20171 PCT Pub. Date May 14, 1998In a process for producing sponge iron by direct reduction of iron-oxide-containing material, synthesis gas is mixed with top gas forming in the...
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Main Authors | , , , |
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Format | Patent |
Language | English French German |
Published |
19.12.2001
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Edition | 7 |
Subjects | |
Online Access | Get full text |
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Summary: | PCT No. PCT/AT97/00236 Sec. 371 Date Sep. 30, 1998 Sec. 102(e) Date Sep. 30, 1998 PCT Filed Nov. 5, 1997 PCT Pub. No. WO98/20171 PCT Pub. Date May 14, 1998In a process for producing sponge iron by direct reduction of iron-oxide-containing material, synthesis gas is mixed with top gas forming in the direct reduction of the iron-oxide-containing material and is utilized as a CO- and H2-containing reducing gas for direct reduction and for heating the iron-oxide-containing material to a reduction temperature. To be able to save energy in an economically efficient manner when producing steel, especially in the refining process, direct reduction is carried out as follows: (1) in addition to the reducing gas, a carbon-containing gas, such as natural gas, or a gas having higher hydrocarbons is utilized for reduction; (2) the iron-oxide-containing material for a predetermined period of time exceeding the period necessary for complete reduction is exposed to the reducing gas and to the additionally supplied carbon-containing gas, and (3) a CO/CO2 ratio ranging between 2 and 5, preferably a ratio in excess of 2.5, is adjusted in the reducing gas. |
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Bibliography: | Application Number: EP19970910150 |