Abstract: Provided is a device for producing partially reduced iron, with which partially reduced iron having a prescribed reduction ratio can be produced efficiently. The present invention is equipped with: CO sensors that detect the carbon monoxide concentration in an exhaust gas; an O2 sensor that detects the oxygen concentration in an exhaust gas; an exhaust gas circulation device that adjusts the circulating amount of the exhaust gas supplied to a reduction furnace main body, and an air feed device that adjusts the amount of air that being fed; and a control device that controls these devices. The control devices on the basis of the carbon monoxide concentration in the exhaust gas as detected by the CO sensor and the oxygen concentration in the exhaust gas as detected by the O2 sensor.

Abstract: Provided is a device for producing partially reduced iron, with which partially reduced iron having a prescribed reduction ratio can be produced efficiently. The present invention is equipped with: CO sensors that detect the carbon monoxide concentration in an exhaust gas; an O2 sensor that detects the oxygen concentration in an exhaust gas; an exhaust gas circulation device that adjusts the circulating amount of the exhaust gas supplied to a reduction furnace main body, and an air feed device that adjusts the amount of air that being fed; and a control device that controls these devices. The control devices on the basis of the carbon monoxide concentration in the exhaust gas as detected by the CO sensor and the oxygen concentration in the exhaust gas as detected by the O2 sensor.

Abstract: Provided is a green pellet (10) which comprises: an inner core layer (11) containing an iron oxide-containing starting material, a carbonaceous material for reduction, and a slag-forming agent; and a coating layer (12) disposed so as to encapsulate the surface of the inner core layer (11), wherein the coating layer (12) is formed from a protective layer (12a), which is disposed so as to encapsulate the surface of the inner core layer (11) and which contains an inorganic compound (includes an alkali metal oxide) having a melting point that is 750°C. or greater but less than 1100°C., and a combustion layer (12b ), which is disposed so as to encapsulate the surface of the protective layer (12a) and which contains the carbonaceous material.

Abstract: A partially-reduced iron producing apparatus includes: an exhaust gas circulating device which supplies an oxygen-containing gas to raw-material pellets to be heated by a heat of ignition raw-material pellets, the oxygen-containing gas made by circulating part of an exhaust gas discharged from the raw-material pellets by use of the heat of the ignition raw-material pellets heated in a heating furnace and mixing the discharged exhaust gas with air; and a liquid-tar separating device which is provided in the exhaust gas circulating device and which separates a tar component in the exhaust gas from the exhaust gas as a liquid tar.

Abstract: A partially-reduced iron producing apparatus includes: a supplying device laying ignition raw-material pellets on an endless-grate; a heating furnace heating the ignition raw-material pellets; another supplying device laying the raw material pellets on the ignition raw-material pellets; and an exhaust gas circulation device supplying an oxygen-containing gas to the raw-material pellets. The oxygen containing gas is made by circulating part of an exhaust gas discharged from the raw-material pellets and mixing it with air. A partially-reduced iron is produced by thermally reducing the raw-material pellets in a bed height direction thereof through separate combustion and heating regions. The combustion region formed on an upstream side in a travelling direction of the endless grate by supplying the oxygen-containing gas having a high oxygen concentration.

Abstract: A reduction furnace includes a pellet material supplying device forming on a grate an ignition carbon material layer having a predetermined height; an ignition device; and an exhaust gas circulation device supplying an oxygen-containing gas comprising circulated exhaust gas mixed with air, to a packed bed of the pellets heated by a combustion heat of the ignition carbon material layer. A partially-reduced iron is produced by thermally reducing the pellets through a combustion region for the ignition carbon material layer and a heating region, the combustion region formed upstream in a travelling direction of the grate by supplying a gas having a high oxygen concentration, the heating region formed downstream of the combustion region by supplying a gas having a low oxygen concentration.

Abstract: A partially-reduced iron producing apparatus includes: an exhaust gas circulating device supplying an oxygen-containing gas to raw-material pellets to be heated by ignition of raw-material pellets, the oxygen-containing gas made by circulating part of an exhaust gas by use of the heat of the ignition raw-material pellets and mixing the discharged exhaust gas with air; and a liquid-tar separating device which is provided in the exhaust gas circulating device. A partially-reduced iron is produced by heating and reducing the whole of the raw-material pellets in a bed height direction thereof through a combustion region for the raw-material pellets and a heating region for the raw-material pellets, the combustion region formed on an upstream side of an endless grate by supplying the gas having a high oxygen concentration; and the heating region formed downstream of the combustion region of the endless grate by supplying the gas having a low oxygen concentration.

Abstract: Provided is a green pellet (10) which comprises: an inner core layer (11) containing an iron oxide-containing starting material, a carbonaceous material for reduction, and a slag-forming agent; and a coating layer (12) disposed so as to encapsulate the surface of the inner core layer (11), wherein the coating layer (12) is formed from a protective layer (12a), which is disposed so as to encapsulate the surface of the inner core layer (11) and which contains an inorganic compound (includes an alkali metal oxide) having a melting point that is 750° C. or greater but less than 1100° C., and a combustion layer (12b), which is disposed so as to encapsulate the surface of the protective layer (12a) and which contains the carbonaceous material.

Abstract: An evaporation source having a nozzle structure that makes the distribution of film thickness uniform in the width direction of a substrate and a vacuum evaporator using the same are provided. A vapor produced by evaporation or sublimation by heating to evaporation material is discharged from a long nozzle opening like a band. A deposited substrate is transferred in a direction perpendicular to the longitudinal direction of the nozzle opening while facing the nozzle opening. A discharge flow rate of vapor per unit area in the longitudinal direction of the nozzle opening is made to be maximum in a portion at a nozzle width direction position corresponding to a substrate edge position rather than a central part of the nozzle opening and a plurality of partition plates providing directivity to the flow of vapor are arranged inside the nozzle opening.

Abstract: A crucible is a monolithic structure extending over an entire area of a vaporizing chamber and has at least one slit groove provided in the upper surface thereof. The at least one slit groove has a length from one end of the upper surface of the crucible to other end thereof. The at least one slit groove is used as a portion for containing the evaporation material (dopant material or the like). Alternatively, a crucible is a monolithic structure extending over the entire area of the vaporizing chamber and has a plurality of holes provided in the upper surface thereof. The holes are used as portions for containing the evaporation material. Further, the crucible is divided into a plurality of regions, and individual electric heaters are provided under the lower surface of the crucible for the respective regions, whereby temperature can be individually controlled for the respective regions by the electric heaters.

Abstract: A crucible is a monolithic structure extending over an entire area of a vaporizing chamber and has at least one slit groove provided in the upper surface thereof. The at least one slit groove has a length from one end of the upper surface of the crucible to other end thereof. The at least one slit groove is used as a portion for containing the evaporation material (dopant material or the like). Alternatively, a crucible is a monolithic structure extending over the entire area of the vaporizing chamber and has a plurality of holes provided in the upper surface thereof. The holes are used as portions for containing the evaporation material. Further, the crucible is divided into a plurality of regions, and individual electric heaters are provided under the lower surface of the crucible for the respective regions, whereby temperature can be individually controlled for the respective regions by the electric heaters.

Abstract: Provided is an in-line film-formation apparatus including: deposition sources, deposition-preventing plates, and a screen. The deposition sources store different film-formation materials, and include openings extending in the width directions of a substrate, which is perpendicular to the conveying direction. The openings, arranged in parallel with each other, are disposed respectively on the upstream and the downstream sides in the conveying direction. The plates, partitioning a co-deposition chamber from adjacent deposition chambers and placed, in parallel to each other, on the upstream and the downstream sides in the conveying direction, limit a deposition region of the vapor from the openings. The screen limits and makes the deposition regions of the substrate for vapor from openings coincide with deposition regions limited by the plates. Thereby, the formation of a mono-content film is prevented and only the mixed film is formed on the substrate.

Abstract: An evaporation source having a nozzle structure that makes the distribution of film thickness uniform in the width direction of a substrate and a vacuum evaporator using the same are provided. A vapor produced by evaporation or sublimation by heating to evaporation material is discharged from a long nozzle opening like a band. A deposited substrate is transferred in a direction perpendicular to the longitudinal direction of the nozzle opening while facing the nozzle opening. A discharge flow rate of vapor per unit area in the longitudinal direction of the nozzle opening is made to be maximum in a portion at a nozzle width direction position corresponding to a substrate edge position rather than a central part of the nozzle opening and a plurality of partition plates providing directivity to the flow of vapor are arranged inside the nozzle opening.

Abstract: A crucible is a monolithic structure extending over an entire area of a vaporizing chamber and has at least one slit groove provided in the upper surface thereof. The at least one slit groove has a length from one end of the upper surface of the crucible to other end thereof. The at least one slit groove is used as a portion for containing the evaporation material (dopant material or the like). Alternatively, a crucible is a monolithic structure extending over the entire area of the vaporizing chamber and has a plurality of holes provided in the upper surface thereof. The holes are used as portions for containing the evaporation material. Further, the crucible is divided into a plurality of regions, and individual electric heaters are provided under the lower surface of the crucible for the respective regions, whereby temperature can be individually controlled for the respective regions by the electric heaters.

Abstract: A method of producing reduced iron pellets including reducing raw material pellets to obtain reduced iron pellets, and rolling the reduced iron pellets at a temperature ranging between 800 and 1200° C. sufficiently such that the reduced iron pellets undergo sintering.

Abstract: A reduced iron discharger in a rotary hearth reducing furnace scoops up reduced iron on a rotary hearth from a front side with the use of an impeller enough long to cover the entire width of the rotary hearth, drops the reduced iron onto a vibrating conveyor mounted in the impeller, and discharges it from an outlet to the outside of the reducing furnace. The reduced iron discharger involves minimal structural waste, and gives a satisfactory yield.

Abstract: A pretreatment apparatus for raw materials for production of reduced iron pretreats the raw materials, comprising an iron material, such as iron ore, and other raw materials, such as coal and flux, by a dryer, classifiers, a roll press, and a vertical mill, and feeds the pretreated raw materials to a pelletizer via a feed bin. At least two fluidized mixers for mixing the classified raw materials, one of the fluidized mixers for storage and the other fluidized mixer for supply, are provided for batch treatment. The pretreatment apparatus can uniformize the crushed particle sizes of iron ore, coal, etc. different in hardness, stably supply homogeneously mixed raw materials, and simplify pelletization-side facilities.

Abstract: An apparatus for producing reduced iron, and a compact drying method for application to the apparatus are disclosed. The apparatus comprises a pelletizer or a briquetter for mixing and agglomerating coal as a reducing agent and iron ore as iron oxide to form compacts, a dryer for drying the compacts, a circular rotary hearth type reducing furnace for reducing the dried compacts in a high temperature atmosphere, a first heat exchanger for performing heat exchange between a hot off-gas discharged from the reducing furnace and combustion air to be supplied to the reducing furnace, and coolers for cooling the hot off-gas. A second heat exchanger for heating drying air is disposed on an exit side of the first heat exchanger. The drying air heated by the second heat exchanger is supplied to the dryer to dry the compacts with the drying air which is scant in moisture. Consequently, highly efficient, stable drying in the dryer can be performed, and high quality reduced iron can be produced stably.

Abstract: An apparatus for producing reduced iron dries agglomerates, pelletized from a powdery mixture of an iron oxide powder and a reducing agent, in a drying chamber, preheats the dried agglomerates in a preheating chamber, and then reduces the preheated agglomerates in a high temperature atmosphere of a reducing furnace. In the preheating chamber, an off-gas from the reducing furnace is convected to preheat the dried agglomerates. A decrease in the fuel cost, and downsizing of the equipment can be achieved by effective use of the sensible heat of the off-gas discharged from the reducing furnace. Moreover, a downsized, simplified system for treatment of the off-gas is realized by decreasing the amount of the off-gas.

Abstract: In the production of reduced iron by agglomerating a mixed powder of an iron material and a reducing agent to form compacts like briquettes or pellets, and reducing the compacts in a high temperature atmosphere, when the temperature of reduced compacts is 900° C. or higher, the oxide content in the reduced compacts is set at 11% or more, and the basicity of the reduced compacts is set at 0.5 or higher.