Patents Assigned to Midrex International B.V. Zurich Branch
-
Patent number: 7806959Abstract: Metallic iron nuggets made by reducing-melt of a material containing a carbonaceous reductant and a metal-oxide-containing material, the metallic iron nuggets comprising at least 94% by mass, hereinafter denoted as “%”, of Fe and 1.0 to 4.5% of C, and having a diameter of 1 to 30 mm are disclosed.Type: GrantFiled: June 4, 2007Date of Patent: October 5, 2010Assignee: Midrex International B.V. Zurich BranchInventors: Shuzo Ito, Yasuhiro Tanigaki, Isao Kobayashi, Osamu Tsuge, Keisuke Honda, Koji Tokuda, Shoichi Kikuchi
-
Patent number: 7674316Abstract: A hearth material is laid in the form of a layer on the hearth prior to supply of a mixture containing a carbonaceous reducing agent and iron oxides onto a hearth of a reduction melting furnace, thereby forming a renewable hearth capable of being renewed, and the metallic iron is produced while renewing a part or the whole of the renewable hearth, which has deteriorated during operation, with the hearth material.Type: GrantFiled: July 31, 2008Date of Patent: March 9, 2010Assignee: Midrex International B.V. Zurich BranchInventors: Osamu Tsuge, Yasuhiro Tanigaki, Isao Kobayashi, Koji Tokuda, Shoichi Kikuchi, Shuzo Ito
-
Publication number: 20090031859Abstract: A hearth material is laid in the form of a layer on the hearth prior to supply of a mixture containing a carbonaceous reducing agent and iron oxides onto a hearth of a reduction melting furnace, thereby forming a renewable hearth capable of being renewed, and the metallic iron is produced while renewing a part or the whole of the renewable hearth, which has deteriorated during operation, with the hearth material.Type: ApplicationFiled: July 31, 2008Publication date: February 5, 2009Applicant: MIDREX INTERNATIONAL B. V. Zurich BranchInventors: Osamu TSUGE, Yasuhiro Tanigaki, Isao Kobayashi, Koji Tokuda, Shoichi Kikuchi, Shuzo Ito
-
Publication number: 20070227301Abstract: Metallic iron nuggets made by reducing-melt of a material containing a carbonaceous reductant and a metal-oxide-containing material, the metallic iron nuggets comprising at least 94% by mass, hereinafter denoted as “%”, of Fe and 1.0 to 4.5% of C, and having a diameter of 1 to 30 mm are disclosed.Type: ApplicationFiled: June 4, 2007Publication date: October 4, 2007Applicant: MIDREX INTERNATIONAL B.V. Zurich BranchInventors: Shuzo Ito, Yasuhiro Tanigaki, Isao Kobayashi, Osamu Tsuge, Keisuke Honda, Koji Tokuda, Shoichi Kikuchi
-
Publication number: 20060248981Abstract: Metallic iron nuggets made by reducing-melt of a material containing a carbonaceous reductant and a metal-oxide-containing material, the metallic iron nuggets comprising at least 94% by mass, hereinafter denoted as “%”, of Fe and 1.0 to 4.5% of C, and having a diameter of 1 to 30 mm are disclosed.Type: ApplicationFiled: July 6, 2006Publication date: November 9, 2006Applicant: MIDREX INTERNATIONAL B.V. Zurich BranchInventors: Shuzo Ito, Yasuhiro Tanigaki, Isao Kobayashi, Osamu Tsuge, Keisuke Honda, Koji Tokuda, Shoichi Kikuchi
-
Publication number: 20060070495Abstract: Metallic iron nuggets made by reducing-melt of a material containing a carbonaceous reductant and a metal-oxide-containing material, the metallic iron nuggets comprising at least 94% by mass, hereinafter denoted as “%”, of Fe and 1.0 to 4.5% of C, and having a diameter of 1 to 30 mm are disclosed.Type: ApplicationFiled: December 8, 2005Publication date: April 6, 2006Applicant: MIDREX INTERNATIONAL B. V. Zurich BranchInventors: Shuzo Ito, Yasuhiro Tanigaki, Isao Kobayashi, Osamu Tsuge, Keisuke Honda, Koji Tokuda, Shoichi Kikuchi
-
Patent number: 6630010Abstract: The present invention is directed to a method of producing granular metallic iron, including: heating a formed raw material comprising a carbonaceous reductant and a substance containing iron oxide in a reduction melting furnace to subject the iron oxide contained in the formed raw material to solid-state reduction; and carburizing reduced iron resulting from the solid-state reduction with carbon contained in the carbonaceous in the formed raw material and causing resulting molten metallic iron to coalesce into the granular metallic iron, wherein an atmospheric gas present in proximity to the formed raw material in the carburizing and melting step has a reduction degree of not less than 0.5. The present invention is also directed to a method of producing metallic iron, including forming a deposit layer containing slag produced in the reduction melting process on hearth refractories, thereby protecting the hearth refractories while producing the metallic iron.Type: GrantFiled: March 28, 2001Date of Patent: October 7, 2003Assignee: Midrex International B.V. Zurich BranchInventors: Shuzo Ito, Yasuhiro Tanigaki, Shoichi Kikuchi, Osamu Tsuge, Isao Kobayashi, Keisuke Honda, Koji Tokuda, Hidekazu Okamoto
-
Patent number: 6592649Abstract: The present invention provides a method of producing metallic iron nuggets with a high yield and good productivity, and more particularly a method which can produce metallic iron nuggets which have a high Fe purity and are excellent in transporting and handling due to a large grain diameter with a high yield and good productivity, when they are produced by reducing and melting raw material containing iron oxide such as iron ore and carbonaceous reducing agent such as coke.Type: GrantFiled: June 28, 2001Date of Patent: July 15, 2003Assignee: Midrex International B.V. Zurich BranchInventors: Shoichi Kikuchi, Yasuhiro Tanigaki, Koji Tokuda, Osamu Tsuchiya, Shuzo Ito
-
Patent number: 6569223Abstract: A method of manufacturing a molten metal iron by charging a starting material at least comprising a carbonaceous reducing material and an iron oxide-containing material into a rotary hearth furnace, reducing under heating the charged starting material into a solid reducing iron, carburizing the metal iron in the solid reduced iron with the carbon ingredient in the carbonaceous reducing material, thereby melting the metal iron, separating the slag ingredient contained in the starting material by the melting, and discharging the molten metal alloy in the molten state as it is to the outside of the rotary hearth furnace for recovery, wherein a downward inclined surface is disposed at an angle 3 to 30° relative to the horizontal plane on the upper surface of a hearth of the rotary hearth furnace on which the starting material is placed, and the molten metal iron is discharged at the discharging position for the molten metal iron from the lowest portion of the inclined surface.Type: GrantFiled: March 29, 2001Date of Patent: May 27, 2003Assignee: Midrex International B.V. Zurich BranchInventors: Yasuhiro Tanigaki, Osamu Tsuge, Isao Kobayashi, Keisuke Honda, Koji Tokuda, Shoichi Kikuchi, Shuzo Ito
-
Patent number: 6503289Abstract: A process comprising: charging a raw material compacting substance containing a carbonaceous reducing agent and an iron oxide contained substance into a moving hearth type furnace; reducing the raw material compacting substance to a reducing ratio 30 to 80% within the reducing furnace to thereby form a shell formed of metal iron or forming a state that a shell formed of metal iron or metal iron are stretched around in a network fashion and a carbonaceous reducing agent remains in a clearance therebetween; agglomerating produced slag containing FeO therein; charging the compacting substance reduced into a melting furnace in a state maintaining a high temperature, and carrying out final reducing and melting to obtain molten meal iron.Type: GrantFiled: March 30, 2001Date of Patent: January 7, 2003Assignee: Midrex International B.V. Zurich BranchInventors: Yasuhiro Tanigaki, Akira Uragami
-
Publication number: 20010025550Abstract: A process comprising: charging a raw material compacting substance containing a carbonaceous reducing agent and an iron oxide contained substance into a moving hearth type furnace; reducing the raw material compacting substance to a reducing ratio 30 to 80% within the reducing furnace to thereby form a shell formed of metal iron or forming a state that a shell formed of metal iron or metal iron are stretched around in a network fashion and a carbonaceous reducing agent remains in a clearance therebetween; agglomerating produced slag containing FeO therein; charging the compacting substance reduced into a melting furnace in a state maintaining a high temperature, and carrying out final reducing and melting to obtain molten meal iron.Type: ApplicationFiled: March 30, 2001Publication date: October 4, 2001Applicant: MIDREX INTERNATIONAL B.V. Zurich BranchInventors: Yasuhiro Tanigaki, Akira Uragami
-
Publication number: 20010025549Abstract: A method of manufacturing a molten metal iron by charging a starting material at least comprising a carbonaceous reducing material and an iron oxide-containing material into a rotary hearth furnace, reducing under heating the charged starting material into a solid reducing iron, carburizing the metal iron in the solid reduced iron with the carbon ingredient in the carbonaceous reducing material, thereby melting the metal iron, separating the slag ingredient contained in the starting material by the melting, and discharging the molten metal alloy in the molten state as it is to the outside of the rotary hearth furnace for recovery, wherein a downward inclined surface is disposed at an angle 3 to 30° relative to the horizontal plane on the upper surface of a hearth of the rotary hearth furnace on which the starting material is placed, and the molten metal iron is discharged at the discharging position for the molten metal iron from the lowest portion of the inclined surface.Type: ApplicationFiled: March 29, 2001Publication date: October 4, 2001Applicant: MIDREX INTERNATIONAL B.V. Zurich BranchInventors: Yasuhiro Tanigaki, Osamu Tsuge, Isao Kobayashi, Keisuke Honda, Koji Tokuda, Shoichi Kikuchi, Shuzo Ito