JPH10251724A - Production of metallic iron and producing equipment therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method, in which iron oxide is efficiently reduced to a metallic iron at the time of obtaining the metallic iron by heating and reducing the iron oxide of iron ore, etc., together with carbon quality reducing agent of carbonaceous material, etc., and also, the high quality metallic iron can efficiently be produced as molten iron by melting and smoothly separating slag component mixed as gangue component, etc., in the iron oxide source of iron ore, etc., and an equipment thereof. SOLUTION: At the time of producing the metallic iron by heating and reducing the formed body of iron oxide containing the carbon quality reducing agent, the metallic iron outer shell is produced and grown by heating and reducing while continuously shifting under condition of laying the formed body on an iron-made band plate 1, and the reduction is progressed until the iron oxide does not substantially exist. Further, the slag is produced in the inner part of the formed body, and after melting the formed body together with the iron- made band plate 1 by further heating this formed body is separated into the molten slag S and the molten iron F.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a technique for obtaining metallic iron by heating and reducing iron oxide such as iron ore together with a carbonaceous reducing agent such as carbonaceous material, and more particularly, to improving iron oxide such as iron ore. When reducing iron oxide by heating with a carbonaceous reducing agent such as wood, it efficiently reduces iron oxide to metallic iron and mixes it as a gangue component in iron oxide sources such as iron ore. The present invention relates to a method and equipment capable of effectively melting and separating a coming slag component and efficiently producing high-purity metallic iron as molten iron.

[0002]

2. Description of the Related Art As a direct iron making method of directly reducing iron oxide such as iron ore and iron oxide pellets with a carbon material or a reducing gas to obtain reduced iron, a shaft furnace method represented by the Midrex method has been conventionally used. Are known. This type of direct iron making method is a method in which a reducing gas produced from natural gas or the like is blown from a tuyere at a lower portion of a shaft furnace, and iron oxide is reduced using the reducing power to obtain reduced iron. Recently, a reduced iron production process using a coal material such as coal as a reducing agent in place of natural gas has been attracting attention.Specifically, calcined pellets such as iron ore are reduced by heating in a rotary kiln together with coal powder, The so-called SL / RN method has already been put to practical use.

As another method for producing reduced iron, US Pat. No. 3,443,931 discloses a method in which a carbon material and powdered iron oxide are mixed to form a lump and reduced by heating on a rotary hearth to produce reduced iron. A process is disclosed. In this process, fine ore and fine coal are mixed and agglomerated, and this is heated and reduced in a high-temperature atmosphere.

[0004] The reduced iron produced by these methods is used as an iron source as it is or after being shaped into a briquette or the like, and then charged into an electric furnace. In recent years, as the recycling of iron scrap has become more active, reduced iron obtained by the above method has attracted attention as a diluent for impurity elements mixed into the scrap.

[0005] However, the reduced iron obtained by the conventional reduction iron making method includes iron oxide (such as iron ore) used as a raw material.
SiO _2, Al ₂ O ₃ contained in or carbonaceous material (such as coal),
Since the slag component such as CaO is directly mixed, the iron quality (purity as metallic iron) of the product is lowered. In practical use, these slag components are separated and removed in the next smelting process. In order to meet such demands with the conventional method of producing reduced iron as described above, it is necessary to use high-grade iron ore as a raw material for producing reduced iron. Rather, the range of choice of practicable iron-making raw materials is greatly reduced.

Further, the conventional method as described above has a final object of obtaining a reduced solid product as an intermediate product, and in practical use, conveys, stores, and stores it before sending it to the next scouring process. A process such as briquetting or cooling is required. During this process, there are disadvantages such as a large energy loss, extra energy for briquetting and special equipment.

On the other hand, as a method of directly reducing iron oxide to obtain reduced iron, a smelting reduction method such as a DIOS method is also known.
In this method, iron oxide is preliminarily reduced to an iron purity of about 30 to 50%, and then reduced to metallic iron by direct reduction reaction with carbon in an iron bath. In this method, two steps of pre-reduction and final reduction in an iron bath are indispensable, so that not only the operation is complicated, but also the molten iron oxide (FeO) present in the iron bath comes into direct contact with the refractory. Therefore, a problem that refractory wear is severe is pointed out.

Further, Japanese Patent Publication No. 56-19366 discloses that
Heating and reducing the agglomerate containing the metal oxide, the solid carbonaceous material and the slag forming material, while maintaining the shape of the agglomerate, forming a state in which the metal generated by the reduction is wrapped in a slag shell, Thereafter, a method of melting a slag shell to separate metal and slag is disclosed. However, in this method, in order to prevent re-oxidation of the metal generated by the reduction, it is necessary to generate a sufficient amount of slag to completely enclose the metal. It becomes insufficient and reoxidation of the metal becomes unavoidable. In addition, depending on the heating and reducing conditions, a slag having a high FeO concentration is generated, which significantly damages the refractory lining of the equipment, which poses a serious problem in practical use.

As described above, the realization of a method for producing metallic iron with a small slag component content not only increases the added value as a product metallic iron, but also reduces the cost of iron making using an electric furnace and further reduces the metallurgy. This becomes extremely important from the viewpoint of flexibility in selecting raw materials used in iron production. In addition, minimizing the iron oxide content in the slag by-produced by heating and reduction and suppressing the erosion of refractories is extremely important in making this type of ironmaking process feasible on an industrial scale. Become.

[0010]

The present inventors have paid attention to such a situation, and have found that iron oxide having a high iron content as well as iron ore having a relatively low iron content, such as erosion of refractories, can be considered. Metal iron with extremely high iron purity without causing
We have been conducting research in advance of the development of a technology that can efficiently obtain molten iron with simple processing. As a result of this research, we have developed the following method, and have already filed a patent application (Japanese Patent Application Hei 8 No. 59801).

[0011] In the prior invention, when the iron oxide molded body in which the carbonaceous reducing agent is present is heated and reduced to produce metallic iron, the metallic oxide is generated and grown by the thermal reduction to substantially reduce the iron oxide. And continue reducing until it no longer exists in
Slag agglomerates are formed inside the compact, heat reduction is used to generate and grow metallic iron hulls, and the reduction is advanced until iron oxide is substantially absent, and heating is continued to form inside the compact. Slag flowing out of the metallic iron shell, heat reduction to generate and grow the metallic iron shell, reduce it until iron oxide is virtually absent, and continue heating to melt and separate the metallic iron and slag Or reducing and heating the metal iron crust by heating and reducing it until iron oxide is substantially absent,
It is characterized in that agglomerates of slag are formed inside the molded body, and then the formed slag is separated from metallic iron.

In carrying out the above method, the molten slag inside the molded body may be caused to flow out of the metal iron shell by melting a part of the metal iron shell. In carrying out the process, in order to melt a part or the whole of the metallic iron shell, the carburization by the carbonaceous reducing agent present in the metal shell may be advanced to lower the melting point of the metal shell, and the above-mentioned inventions In carrying out, by controlling the maximum heating temperature of the heating and reducing step to a temperature equal to or higher than the melting point of the generated slag and equal to or lower than the melting point of the metal iron shell to be generated, the metal iron generation reaction can proceed more efficiently. In this reduction step, if the iron oxide is reduced by solid-phase reduction and further reduced by liquid-phase reduction until iron oxide mainly composed of FeO substantially disappears, the resulting metal can be obtained. It is possible to enhance more efficiently the quality.

[0013] In order to promote the reduction of iron oxide in the solid state, it is necessary that the slag generated in the reduction step be melted at a lower temperature than the metallic iron generated by the reduction. , The composition of the slag forming component contained in the iron oxide or carbonaceous reducing agent in the formed body is adjusted in advance, and the forming process of the formed body is performed so that the melting point of the formed slag is lower than the melting point of the reduced iron. Al ₂ O ₃ , S if necessary
It is desirable to additionally adjust iO ₂ , CaO and the like.

In the above-mentioned prior application, a preferable quantitative criterion for "producing reduction until substantially no iron oxide is present in the inside" is that the content of iron oxide mainly containing FeO is determined in the heating reduction step. The reduction is promoted until the rate becomes 5% by weight or less, more preferably 2% by weight or less. ”From another viewpoint, FeO in the produced slag separated from the metallic iron produced by the reduction reaction is mainly used. It is desirable to proceed with the reduction until the iron oxide content to be 5% by weight or less, more preferably 2% by weight or less.

The high-purity metallic iron and produced slag obtained by this method can be separated by a specific gravity difference in a heated and melted state, resulting in a very high metallization ratio of about 95% or more, and even 98% or more. Purity metallic iron can be obtained, and according to this prior invention, the iron oxide content in the produced slag can be reduced as much as possible.
There is no melting of the refractory of the processing furnace caused by iron oxide, and its practical application is expected as a highly practical technology from the viewpoint of facility maintenance. The present invention intends to provide a manufacturing method and an apparatus which can utilize the basic technical concept of the invention of the prior application and can efficiently carry out the same on an industrial scale.

[0016]

Means for Solving the Problems The method for producing metallic iron according to the present invention, which can solve the above-mentioned problems, relates to a method for producing metallic iron by heating and reducing an iron oxide formed body in which a carbonaceous reducing agent is present. By heating and reducing while continuously moving the molded body placed on an iron strip, a metallic iron skin is generated and grown on the surface of the molded body, and iron oxide is substantially present. While the reduction proceeds until it disappears, slag is generated inside the molded body, and the molded body (metallic iron shell and formed slag) and the iron strip are melted by further heating, and then separated into molten slag and molten iron. However, there is a gist.

In carrying out this method, the above-mentioned formed body is formed into a band-shaped or rod-shaped formed body, which is transferred in a substantially horizontal direction or a downward inclined direction while being mounted on an iron strip, or As a granulated, pellet-shaped or lump-shaped compact, heat reduction is carried out while being transported in a substantially horizontal direction with the compact being placed on an iron strip having walls formed on both sides to prevent the compact from falling. It is better to adopt a method.

It is also possible to form the above-mentioned molded body in a predetermined shape before placing it on an iron strip.
A continuous molding device for the compact is provided near the supply position of the compact, or a pre-reduction device is further provided to continuously perform molding and supply of the compact, or to further form and pre-reduce the compact. It is also very effective to continuously supply and supply.

Further, the equipment for producing metallic iron according to the present invention is equipment that is preferably used when carrying out the above-mentioned production method, and is constituted by heating and reducing an iron oxide compact in which a carbonaceous reducing agent is present. Equipment to produce metallic iron
A continuous transfer member for continuously transferring the compact in a state of being placed on an iron strip, and the compact is sequentially heated and reduced and melted in a transfer process, and the iron strip is heated and melted. The gist lies in that a heating member and a separation section for receiving the molten molten slag and the molten iron and separating them are provided.

In the case where a granular, pellet-like, or lump-shaped compact is heated and reduced by using this equipment, the iron-made strip is placed at the mounting position of the iron-made strip or on the upstream side thereof, and on both side edges of the iron-made strip. If a processing section for forming a wall for preventing the molded article from falling is provided, and the molded article is placed and transported thereon, the molded article does not fall off from the iron strip. preferable. In addition, if a forming device for forming a formed body is provided on the upstream side of the mounting position of the formed body on the metal strip, or a pre-reduction device for further pre-reducing the formed body is provided. It is preferable because a series of steps including molding of the molded body and further preliminarily reducing the same can be continuously performed.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As described above, according to the present invention, when heat-reducing an iron oxide formed body containing a carbonaceous reducing agent to produce metallic iron, the formed body is placed on an iron strip. By heating and reducing while continuously transferring in the placed state, a metal iron shell is generated and grown to form a generated slag inside, and further heating is used to form the metal iron shell and the slag and the iron band used for transfer. It is characterized in that after the plate is melted, it is separated into molten slag and molten iron.By adopting such a method, a series of steps of heat reduction of the molded body, separation of metallic iron and slag generated by reduction The process can be performed continuously.

Further, if the formed body is continuously formed or the preformed body can be preliminarily reduced on the upstream side of the mounting position of the formed body on the metal strip, the metallic iron can be formed. It is possible to continuously perform a series of steps from forming of a molded material to be a production raw material (and further pre-reduction) to heat reduction, heat melting of metallic iron and slag generated by reduction, and furthermore, melting and separation of these. Become.

In the heat reduction step, first, heat reduction proceeds on the outer peripheral side of the formed body to form an outer cover made of metallic iron, and thereafter, the carbonaceous reducing agent itself and the thermal decomposition thereof are formed inside the outer cover. Due to the reducing action of carbon monoxide, the reduction reaction of iron oxide in the outer skin proceeds efficiently, and the generated metallic iron adheres to and aggregates with each other, and the generated slag fuses and aggregates with each other. As a result, the metallization rate in this heat reduction step is significantly increased, and the amount of iron oxide mixed in the produced slag is significantly reduced.

Further, on the downstream side of the portion where the heat reduction is performed, the metal iron shell and the slag are melted by further heating, and the iron strip used for the transfer is also melted. Since the metal is separated by the specific gravity difference in the separated part, highly reduced metallic iron can be efficiently obtained as molten iron. In addition, as a result of the high reduction of iron oxide in the heat reduction step, the amount of iron oxide mixed into the molten slag by-produced is also extremely small, and the refractory erosion due to the mixing of iron oxide is also possible. It can be suppressed to.

Hereinafter, the production method and the production equipment according to the present invention will be specifically described with reference to the drawings showing one embodiment, but the present invention is not limited to the illustrated examples.
It is also possible to carry out the present invention with appropriate modifications within a range that can be adapted to the gist of the preceding and the following, and all of them are included in the technical scope of the present invention.

FIG. 1 (A) shows an embodiment of the present invention, and is a schematic longitudinal sectional explanatory view for explaining a typical method for producing metallic iron together with production equipment, where 1 is an iron-made one. Strip,
Reference numeral 2 denotes an annealing furnace, 3 denotes a forming section, 4 denotes a raw material hopper, 5 denotes a heating reduction furnace, 6 denotes a heating and melting furnace, and 7 denotes a melting and separating furnace.

In the present invention, the iron strip 1 is used for transferring a raw material compact. The iron strip 1 is passed through an annealing furnace 2 to be softened and annealed. [FIG. 1 (B): partial cross-sectional explanatory view], and then continuously fed into the heating and reducing furnace 5. Then, a raw material compact obtained by molding a mixture of a carbonaceous reducing agent such as a carbonaceous material, an iron oxide such as iron ore, and a binder to be blended as required into granules, pellets, agglomerates, etc. Is placed on the strip 1 from the raw material hopper 4 provided on the most upstream side of the furnace, and is continuously transferred to the right in the drawing in the heating and reducing furnace 5. A heating burner (not shown) is provided on a side wall or a ceiling portion of the heating and reducing furnace 5, and the molded body is heated by heating by the burner, and is sequentially dried and then reduced by heating.

In the heat reduction step, as described above, the reduction proceeds from the surface layer by the solid reducing agent contained in each molded body, and the metal iron generated as described above forms an outer shell mainly composed of metal iron on the surface. Inside, a strong reducing atmosphere is formed by the carbonaceous reducing agent and carbon monoxide generated by its thermal decomposition, and the reduction of iron oxide proceeds rapidly inside. Therefore, if the moving speed of the strip 1 and the heating conditions are appropriately controlled in accordance with the length of the heating and reducing furnace 5, the iron oxide inside is efficiently reduced by the strong reducing atmosphere in the metallic iron sheath, and as a whole, Can be increased to a level of 95% or more, and even 98% or more.

The slag by-produced with the formation of metallic iron is:
The metal melts at a lower temperature than the metallic iron in the metallic iron shell, and is fused to each other to be separated from the metallic iron. However, the molten metal is further separated by the heating and melting furnace 6 provided downstream of the thermal reduction furnace 5. Upon receiving the heating, the iron strip 1 is melted together with the metallic iron and the generated slag forming the outer skin, and flows out toward the melting and separating furnace 7 sequentially. Then, in the melting and separating furnace 7, the molten slag S having a small specific gravity floats and separates on the surface of the molten iron F. Therefore, the molten slag S is extracted from the molten metal side of the melting and separating furnace 7, and the molten iron F may be extracted from the bottom. .

In the figure, reference numeral 8 denotes an exhaust gas outlet, and the exhaust gas discharged from the outlet 8 may be discharged as it is. However, since this exhaust gas is high in temperature and contains flammable gas, It is preferable to supply the fuel gas to a burner for heating the heating furnace 5 and the heating / melting furnace 6 or the like, or to effectively use the fuel gas for preheating combustion air. As the raw material compact supplied from the raw material hopper 4, it is desirable to use a material which has been formed into pellets or the like in advance and preliminarily dried. This is preferable because the furnace 5 can be shortened. In addition, a molding device (not shown) for molding a raw material compact such as a pellet is installed near the hopper 4, and the raw material molded by the molding device is continuously supplied to the hopper 4. It is also possible to make the constitution and to continuously form and heat-reduce the raw material molded body.

FIG. 2A is a schematic longitudinal sectional view showing another embodiment of the present invention, in which 1 is an iron strip, 3 is a forming section, 9 is a material kneading extruder, and 5 is a heating reduction. Furnace, 6 is a heating and melting furnace, and 7 is a melting and separating furnace.

Also in this embodiment, the iron strip 1 is used for transferring a raw material compact, but the compact placed on the iron strip 1 is made to be a long object, which is continuously formed. While being placed on the iron strip 1 and continuously fed into the heating and reducing furnace 5. That is, in this example, as shown in the figure,
, A raw material kneading extruder 9 is provided, and a carbonaceous reducing agent, iron oxide, and a binder are supplied to the kneading extruder 9 and kneaded, and the mixture is extruded from the tip to the forming section 3. The iron strip 1 is also continuously supplied to the molding part 3, and the kneaded material is supplied onto the iron strip 1 in the molding part 3 and shaped into an arbitrary cross-sectional shape [FIG.
(B): Partial cross-sectional explanatory view] and sent in the direction of the heating and reducing furnace 5 together with the strip 1. The cross section of the molded body at this time may be a flat plate or a rod shape, but it should have a shape having streaky irregularities in the longitudinal direction so that the surface area can be increased and drying and heat reduction can be efficiently promoted. Is desirable.

In this embodiment, the formed body is continuously placed as a long object on the iron strip 1 and there is no fear that the formed body rolls down on the strip 1. The plate 1 may be in the form of a flat plate, and the transfer direction of the strip 1 may be inclined at an appropriate angle in addition to the horizontal direction so that the transfer can be performed more smoothly.

The heating and reducing furnace 5 has a drying section on the most upstream side and a heating and reducing section on the downstream side, and a heating burner (not shown) is provided on a side wall or a ceiling of each section. The molded body is heated by the heating of, and is sequentially dried and then reduced by heating. In this heating reduction step,
In the same manner as described above, the reduction proceeds from the surface layer side by the solid reducing agent contained in the elongated molded body, and the metallic iron generated as described above forms an outer shell mainly composed of metallic iron on the surface. Inside, a strong reducing atmosphere is formed by the carbonaceous reducing agent and carbon monoxide generated by its thermal decomposition, and the reduction of iron oxide proceeds rapidly inside. Therefore, if the moving speed of the strip 1 and the heating conditions are appropriately controlled in accordance with the length of the heating and reducing furnace 5, the iron oxide inside is efficiently reduced by the strong reducing atmosphere in the metallic iron sheath.

The slag by-produced with the production of metallic iron is:
The metal melts at a lower temperature than the metal iron in the metal iron shell, and is fused and separated from each other. However, the heating and melting furnace 6 provided on the downstream side of the heat reduction furnace 5 further heats the metal. When it is received, the iron strip 1 is melted together with the metallic iron and the formed slag forming the outer skin, and flows out toward the melting and separating furnace 7 sequentially. In the melting and separating furnace 7, the molten slag S and the molten iron F are separated in the same manner as described above.

In designing the specific equipment for implementing these methods, it is, of course, possible to make appropriate design changes within a range that can be adapted to the above-mentioned purpose. Included in the range. In the operation of the equipment, various conditions (operation temperature, amount of carbonaceous reducing agent and addition form, utilization of exhaust gas, etc.) are appropriately selected and applied similarly as described above or as described below. be able to.

For example, in carrying out the present invention, the carbonaceous reducing agent contained in the molded body is first consumed in the heat reduction step for reducing iron oxide and carburizing the metallic iron produced by the reduction. The previous solid state reduced iron is porous and susceptible to re-oxidation. Therefore, in order to prevent the reoxidation of the reduced iron, a carbonaceous reducing agent sufficient to prevent the reoxidation is contained in the molded body, and heating is performed by CO gas generated by combustion of the carbonaceous reducing agent. It is necessary to maintain a non-oxidizing atmosphere around the molded body descending in the reduction furnace 5. For this purpose, the amount of the carbonaceous reducing agent contained in the molded body is at least [C amount required for reduction of the raw material iron oxide +
It is desired to adjust the amount of the reduced iron so as to be equal to or more than the amount of C consumed for carburization of the reduced iron + the amount of oxidation loss in the furnace.
In addition, as another means for preventing the reoxidation of the reduced iron, a shortage of the carbonaceous reducing agent or CO may be supplied downstream of the heating reduction furnace 5 or in the heating melting furnace 6 or the melting separation furnace 7. It is possible.

Then, a method of replenishing the carbonaceous reducing agent in the heating / melting furnace 6 or the melting / separating furnace 7 is employed, or if an excess carbonaceous reducing agent is previously added to the molded body, the heating / reducing furnace 5 Even when the iron oxide that cannot be completely reduced is sent to the heating / melting furnace 6 or the melting / separating furnace 7, it is preferable because the reduction of the unreduced iron oxide can be completed in these furnace parts. .

In practicing the present invention, in order to promote the reduction of iron oxide in a solid state, the slag generated in the heat reduction step is at a lower temperature than the metallic iron generated by the reduction as described above. It is necessary to melt, and for that purpose, the composition of slag formation components (gangue components mixed in iron ore or carbonaceous reducing agent generally used as an iron oxide source) in the compact is required. It is necessary to adjust in advance and control the melting point of the produced slag to be lower than the melting point of reduced iron or its carburized product. Therefore, depending on the composition of the gangue component, Al ₂ O ₃ or S
It is desirable to replenish iO ₂ , CaO and the like to generate slag having a low melting temperature.

Further, in the illustrated example, an example is shown in which the compact is sent to the heating reduction furnace 5 as it is to perform the heating reduction. However, the length of the heating reduction furnace 5 is shortened and the heating reduction is advanced in a shorter time. Therefore, it is extremely effective to preliminarily reduce the molded body and then feed the molded body into the heating reduction furnace 5. In this case, a preliminary reduction device is naturally provided upstream of the raw material hopper 4.

A submerged weir is provided in the melting and separating furnace 7, and the molten slag S having a small specific gravity is dammed by the submerged weir to be drawn out from the molten metal surface, and molten iron F having a large specific gravity passing through the submerged weir is removed. It is preferable that the molten iron F and the molten slag S be separated more efficiently because the molten iron F and the molten slag S are separated from the downstream side. It is preferable to further increase the fluidity by heating to a high temperature because the separation and discharge of the slag S and the molten iron F can be further facilitated.

[0042]

The present invention is configured as described above, and enables the new metal iron production technology proposed in the prior application invention to be efficiently realized on a practical scale. In addition to iron oxide having a high iron content, Even from an iron source such as iron ore having a low iron content, extremely high-purity metallic iron having a metallization ratio of 95% or more, and even 98% or more, can be produced in a continuous manner with high productivity. In addition, if this method and equipment are used, the amount of iron oxide mixed into the slag by-produced in the heating and reducing step can be significantly reduced, and the refractory lining of a melting separation furnace or the like is damaged by the molten iron oxide. Can be suppressed as much as possible.

[Brief description of the drawings]

FIG. 1 is a schematic sectional explanatory view showing a typical example of a method and a facility for producing metallic iron according to the present invention.

FIG. 2 is a schematic cross-sectional explanatory view showing another example of the method for producing metallic iron and the production equipment according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Iron strip 2 Annealing furnace 3 Forming part 4 Raw material hopper 5 Heat reduction furnace 6 Heat melting furnace 7 Melt separation furnace 8 Exhaust gas discharge port 9 Kneading extruder F Molten iron S Melting slag

Claims (12)

[Claims] When producing a metallic iron by heating and reducing an iron oxide compact in which a carbonaceous reducing agent is present, heating is performed while continuously moving the compact while placing the compact on an iron strip. By reducing, a metal iron skin is generated and grown on the surface of the molded body, and the reduction is advanced until iron oxide is substantially absent, and slag is generated inside the molded body, and further heating is performed. A method for producing metallic iron, comprising: melting the formed body and the iron strip and then separating the molten slag and molten iron. 2. The method for producing metallic iron according to claim 1, wherein the molded body is a band-shaped or rod-shaped molded body. 3. The method for producing metallic iron according to claim 2, wherein the heat reduction is carried out while transferring the compact in a substantially horizontal direction or a downwardly inclined direction. 4. The method for producing metallic iron according to claim 1, wherein the compact is a granular, pellet-like or massive compact. 5. The method for producing metallic iron according to claim 4, wherein the heat reduction is carried out while transferring the compact in a substantially horizontal direction. 6. The method for producing metallic iron according to claim 5, wherein walls for preventing the compact from being formed are formed on both side edges of the steel strip, and the compact is mounted on the iron strip. 7. The method for producing metallic iron according to claim 1, wherein the compact is preliminarily reduced and then supplied. 8. The method for producing metallic iron according to claim 1, wherein the molded body is placed on an iron strip while being continuously molded. 9. A facility for producing metallic iron by heating and reducing an iron oxide compact in which a carbonaceous reducing agent is present, wherein the compact is continuously transferred while being placed on an iron strip. A continuous transfer member, a heating member for sequentially heating and reducing and melting the formed body in the transfer process, and a heating member for heating and melting the iron strip, and a separation device for receiving the generated molten slag and the molten iron and separating them. And a production facility for metallic iron. 10. A processing portion for forming a molded article falling prevention wall on both side edges of the iron strip at the mounting position of the iron strip or at the upstream side thereof. Manufacturing equipment. 11. The manufacturing equipment according to claim 9, wherein a molding device for molding a molded body is provided upstream of a position where the molded body is placed on the metal strip. 12. A forming device for forming a formed body and a pre-reduction device for pre-reducing the formed body are provided upstream of a position where the formed body is placed on the metal strip. Item 11. The manufacturing equipment according to Item 9 or 10.