公开(公告)号：US4908059A

公开(公告)日：1990-03-13

申请号：US302355

申请日：1989-01-27

申请人： Akihide Hikosaka ,  Tsuyoshi Mimura ,  Tomio Suzuki ,  Takeo Yoshigae ,  Shuzo Ito

发明人： Akihide Hikosaka ,  Tsuyoshi Mimura ,  Tomio Suzuki ,  Takeo Yoshigae ,  Shuzo Ito

IPC分类号： C21B11/00 ,  C21B11/02 ,  C21B13/00 ,  C21C1/02 ,  F27B1/08

CPC分类号： F27B1/08 ,  C21B11/02 ,  C21C1/02 ,  Y02P10/136 ,  Y02P10/212

摘要： Described herein is a process for melting iron material in the production of molten iron, in which cold iron material such as scraps, cold pig iron or reduced iron is charged into a melting furnace, the process comprising: feeding a carbon-containing solid material into a precombustion vessel for primary combustion therein with supply of an oxygen-containing gas with an oxygen content corresponding to 0.4 to 0.9 of theoretical air ratio; separating combustion residues of the carbon-containing solid material from the resulting hot reducing gas; and introducing the reducing gas into the melting furnace for secondary combustion therein with supply of an oxygen-containing gas holding an oxygen concentration corresponding to 0.7 to 1.3 of theoretical air ratio in total with the oxygen-containing gas supplied to the precombustion furnace.

公开(公告)号：US4957545A

公开(公告)日：1990-09-18

申请号：US302612

申请日：1989-01-27

申请人： Akihide Hikosaka ,  Tsuyoshi Mimura ,  Tomio Suzuki ,  Takeo Yoshigae ,  Shuzo Itoh

发明人： Akihide Hikosaka ,  Tsuyoshi Mimura ,  Tomio Suzuki ,  Takeo Yoshigae ,  Shuzo Itoh

IPC分类号： C21B11/00 ,  C21B13/00 ,  C21B13/14

CPC分类号： C21B13/14 ,  C21B13/0013 ,  Y02P10/136 ,  Y02P10/212

摘要： Described herein is a smelting reduction process for smelting and reducing an iron oxide material by introducing same into a smelting reduction furnace together with a solid carbonaceous material, a fluxing agent and an oxygen-containing gas, process comprising: subjecting part or all of the solid carbonaceous material to primary combustion using an oxygen-containing gas with an oxygen content corresponding to a theoretical air ratio of 0.4 to 0.9: separating the resulting reducing gas from combustion residue of the solid carbonaceous material; and introducing the reducing gas into a smelting reduction furnace to effect secondary combustion with supply of a separately introduced oxygen-containing gas for smelting and reducing said iron material.