JP2018003080A - Production method of iron-making raw material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a production method an iron-making raw material capable of readily utilizing in a blast furnace or a revolving furnace, as a reduction sintered material without oxidizing a metal while suppressing a treatment cost of iron-making dust and/or iron-making sludge.SOLUTION: A production method of an iron-making raw material characterized in that iron-making dust and/or iron-making sludge generated during an iron-making step and a carbon material are mixed and charged in a reaction vessel, in a state where oxygen is shut from the iron-making dust and/or iron-making sludge, the reaction furnace is heated, and a reduction sintered material obtained by reducing at least a part of metallic components contained in the iron-making dust and/or iron-making sludge is used as an iron-making raw material.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a method for producing an iron-making raw material that efficiently reduces iron-making dust and / or iron-making sludge, and at the same time, forms an iron-making raw material in a lump shape that is easy to use.

  In a generally performed iron making process, a certain amount of iron making dust containing metal components including iron is generated. The main sources of iron dust are blast furnaces, converters, sintering machines, raw material processing steps, and hot metal preliminary processing steps. These iron-making dusts contain a carbon component derived from a part of a metal or an oxide thereof, a reducing material or coal or coke charged as a heat source. In the pickling process and rolling process, a slurry-like substance containing metal oxides and hydroxides called iron-making sludge is discharged. Some of the iron sludge contains oil used in the rolling process.

  These iron-making dust and iron-making sludge are unused resources including valuable metals. For this reason, it is desirable to recycle the metal contained in iron-making dust and iron-making sludge to the iron making process in some form. However, direct recycling is difficult for the following two reasons.

  The first point is that heat is required for processing. These metal components are often oxides or hydroxides. In order to remove (reducing) oxygen in order to return them to metal, heat is required, and in order to melt them in a blast furnace or converter, sensible heat and heat of melting are required to raise the temperature to at least 1500 ° C. Become. Moreover, when a large amount of iron-making dust and iron-making sludge is put into the converter, the temperature in the converter may decrease due to the direct reduction reaction by the carbon contained in the hot metal, which may hinder refining.

  The second point is that it is difficult to charge blast furnaces and converters because iron dust and steel sludge are fine particles. In the case where the iron-making dust or the iron-making sludge is a fine particle having a low density, it is transported by air transport, but it is easily fluidized and unstable, and clogging may occur in the transport process. Even if air transport is possible, when introduced into the blast furnace or converter, it is blown away by the gas in the blast furnace or the gas in the converter, and it is difficult to fix in hot metal or molten steel, so-called “yield” "Is easy to fall. In other words, it is difficult to directly process iron-making dust and iron-making sludge directly in a converter / blast furnace, and it has been necessary to reduce it by some method or to adjust the particle size or density.

  As a method for treating iron-making dust or iron-making sludge, Patent Document 1 discloses a method in which converter sludge is baked into an aggregate using an open furnace. Patent Document 2 discloses a method in which fine dust is collected in a wet form, and slurry formed in a settling tank is squeezed with a filter place to form a cake and then charged into a converter. Furthermore, Patent Document 3 discloses a method in which a briquette is formed by adding a carbon material and a binder to electric furnace dust, and then heated and reduced in a rotary hearth furnace.

Japanese Examined Patent Publication No. 62-19492 Japanese Patent No. 3712944 JP 2009-52141 A

  However, in the method of firing a lump using an open furnace, firing in the air causes the metal in the dust to be oxidized. For this reason, when processing the produced | generated lump body with a blast furnace and a converter, the metal oxidized at the time of baking will be reduced again, and the calorie | heat amount required for reduction | restoration will increase. In addition, the method of pressing and drying to make a cake is a cake that has only been dried and solidified, so the generated cake is pulverized during handling during transportation, storage, etc., and the powder is reprocessed. There is a need to do it. Further, the method using a rotary hearth furnace has a problem in that dust treatment costs increase because an expensive binder is added to dust to form briquettes. In addition, these dust and sludge treatment facilities need to be constructed as dedicated facilities in order to avoid mixing with ordinary products, and this construction cost has been a factor of increasing dust and sludge treatment costs.

  The present invention solves the above-mentioned problems, and reduces the steelmaking dust and steelmaking sludge generated in the ironmaking process as a reduced sintered product without oxidizing the metal in the dust while suppressing an increase in the processing cost. It aims at providing the manufacturing method of the iron-making raw material which can be utilized easily by.

The features of the present invention for solving such problems are as follows.
(1) Ironmaking dust and / or ironmaking sludge generated in the ironmaking process and carbonaceous material are mixed and filled in a reaction vessel, and the ironmaking dust and / or ironmaking sludge is added in a state where oxygen is blocked. A method for producing a steelmaking raw material, characterized in that a reduced sintered product obtained by heating a reaction vessel and reducing at least a part of a metal component contained in the ironmaking dust and the ironmaking sludge is used as a steelmaking raw material.
(2) Filling a reaction vessel with iron-making dust containing carbon and / or iron-making sludge containing carbon, which is generated in the iron-making process, and the reaction vessel with the iron-making dust and / or iron-making sludge blocked in oxygen A method for producing an iron-making raw material, characterized in that a reduced sintered product obtained by heating and reducing at least a part of a metal content contained in the iron-making dust and the iron-making sludge is used as an iron-making raw material.
(3) The method for producing an iron-making raw material according to (1) or (2), wherein the reaction vessel is heated at a maximum temperature in a range of 1050 ° C. to 1300 ° C. for 24 hours or more. .
(4) The method for producing an iron-making raw material according to (1) or (2), wherein the reaction vessel is heated at a maximum temperature in a range of 1050 ° C. to 1200 ° C. for 24 hours or more. .
(5) The iron-making dust and / or the iron-making sludge contains at least one compound of iron, chromium, manganese and nickel, as described in any one of (1) to (4) A method for producing steelmaking raw materials.
(6) The reaction vessel is heated using a heating furnace,
The said heating furnace is a tunnel furnace or a rotary hearth furnace, The manufacturing method of the iron-making raw material as described in any one of (1) to (5) characterized by the above-mentioned.
(7) The iron making process according to (6), wherein in the heating furnace, a plurality of reaction vessels filled so that at least one content ratio of iron making dust and / or iron making sludge is different are simultaneously heated. Raw material manufacturing method.
(8) In the heating furnace, a plurality of reaction vessels filled so that at least one kind of filled iron-making dust and / or iron-making sludge is different is heated at the same time, (6) or ( The manufacturing method of the iron-making raw material as described in 7).

  By carrying out the method for producing an iron-making raw material of the present invention, it is possible to produce a massive reduced sintered product in which the metal content in iron-making dust or iron-making sludge is reduced without using a binder. By using this reduced sintered product as an iron-making material, it is possible to produce an iron-making material that can be easily used without increasing the amount of heat required for reduction in a blast furnace or converter while suppressing an increase in processing costs. Moreover, the iron-making dust and iron-making sludge of a composition which is different for every reaction container can be processed with the manufacturing method of the iron-making raw material of this invention. That is, using the same heating furnace, it is possible to perform heat treatment in parallel with heating of general iron products and heating of iron-making dust and iron-making sludge. Thereby, it is not necessary to construct a heating furnace as a dedicated facility, and the processing cost of iron making dust and iron making sludge can be reduced.

The recycling method of chromium containing dust including the manufacturing method of the iron-making raw material which concerns on this embodiment is shown. An example of the reduction sintering equipment with which manufacture of the iron-making raw material which concerns on this embodiment is applied is shown. It is sectional drawing which shows the state of the chromium containing dust with which the reaction container was filled, and powdery coke. It is a graph which shows the temperature rising profile of a heating furnace.

  The present inventors have studied a method for efficiently reducing iron-making dust and / or iron-making sludge, and as a result, when the dust is held for a long time in a high-temperature reducing atmosphere, the reduction firing in which the contained metal oxide is reduced. It has been found that it is possible to produce a knot. Therefore, it was confirmed that this can be implemented in a process using a method using a tunnel furnace that is used as a method for reducing ore and mill scale and producing sponge iron. The present invention is based on the above findings.

  Hereinafter, the present invention will be described through embodiments of the invention. The embodiment of the present invention will be described by taking, as an example, the treatment of chromium-containing dust generated from a converter in a smelting reduction process and a converter in an oxidation refining process.

  FIG. 1 shows a method for recycling chromium-containing dust, including a method for producing a steelmaking raw material according to the present embodiment. In the recycling method shown in FIG. 1, first, chromium-containing dust, which is iron-making dust generated in the stainless steel smelting process using the converter 10, is collected by the dust collection equipment 12. The chromium-containing dust collected by the dust collection equipment 12 is subjected to reduction sintering processing in the reduction sintering equipment 14 to which the method for producing an iron-making raw material according to the present embodiment is applied, and iron oxide contained in the chromium-containing dust and A reduced sintered product is produced in which at least part of the chromium oxide is reduced. And the reduction | restoration sintered compact with a high reduction | restoration rate of chromium oxide is inserted into the converter of an oxidation refining process using a scrap chute | shoot, and chromium and iron of chromium containing dust are collect | recovered. On the other hand, the reduced sintered product having a low reduction rate of chromium oxide is pulverized using the pulverization equipment 16, and then charged into the converter in the smelting reduction process by injection from a burner lance, and unreduced chromium oxide and iron oxide. Is reduced, and chromium and iron contained in the chromium-containing dust are recovered. Note that chromium oxide and iron oxide contained in the chromium-containing dust are examples of metal components contained in the iron-making dust.

  FIG. 2 shows an example of a reduction sintering facility to which the method for producing a steelmaking raw material according to the present embodiment is applied. The reduction sintering facility 14 includes a screw feeder device 20, a heating furnace 40, and a take-out jig 50. The screw feeder device 20 includes a hopper 22 and a screw 26. The chromium-containing dust 24 collected by the dust collection equipment 12 is stored in the hopper 22. The chromium-containing dust 24 is cut out in a predetermined amount by the screw 26 provided on the lower side of the hopper 22.

  The chromium-containing dust 24 cut out from the screw 26 is guided by the funnel 28 and filled in the reaction vessel 30. Similarly, a predetermined amount of powdery coke is supplied to the reaction vessel 30 from a screw feeder device (not shown). In this manner, a predetermined amount of chromium-containing dust 24 and powdered coke are supplied to the reaction vessel 30. FIG. 3 is a cross-sectional view showing the state of chromium-containing dust and powdered coke filled in the reaction vessel. The reaction vessel 30 is composed of a sagar 40 which is a cylindrical heat-resistant vessel made of SiC having a diameter of 45 mm and a height of 2 m, and an alumina round plate 42 bonded to the bottom of the sagar 40 with mortar. .

  The reaction vessel 30 is first filled with powdered coke 44 at the bottom. Next, powdery coke 46 is filled on the powdery coke 44 and the chromium-containing dust 24 is filled on the center side. Furthermore, the powdery coke 50 is filled thereon. Thus, after powdery coke and chromium containing dust 24 are filled into reaction container 30, powdery coke 52 is further filled in the central part of chromium containing dust 24.

  As shown in FIG. 3, powdery coke is filled in the reaction vessel 30 so as to surround the periphery of the chromium-containing dust 24. Thereby, it is possible to prevent the chromium-containing dust 24 from being baked on the sagar 40 and the circular plate 42. Moreover, by filling the powdery coke 50 into the upper part, the chromium-containing dust 24 can be brought into a state where oxygen is blocked. This can prevent the reduced chromium-containing dust 24 from being oxidized again. Further, by filling the central portion of the chromium-containing dust 24 with the powdery coke 52, after the reduction sintering process is completed, a cavity is formed in the central portion of the chromium-containing dust 24. By inserting a take-out jig (described later) into the cavity from above and locking the take-out jig to the bottom of the reduced sintered product, the reduced sintered product can be easily taken out from the reaction vessel 30.

  The reaction vessel 30 filled with powdered coke and chromium-containing dust is carried into the heating furnace 40 while being placed on the carriage 32 and subjected to reduction sintering treatment in the heating furnace 40. The heating furnace 40 is a tunnel furnace having a total length of about 50 m, for example. The tunnel furnace can accommodate a large number of carriages 32 and can perform reduction sintering treatment by simultaneously heating chromium-containing dust filled in the reaction vessel 30. The tunnel furnace can accommodate a large number of reaction vessels 30 mounted on a large number of carriages 32, but these reaction vessels 30 may be filled with different types of iron-making dust or iron-making sludge. The steelmaking dust and the steelmaking sludge may be filled with different content ratios.

  Thus, since the manufacturing method of the iron-making raw material which concerns on this embodiment can process these several types of iron-making dust and iron-making sludge using the reaction container 30 and the heating furnace 40, the processing equipment of iron-making dust and iron-making sludge The number of can be reduced. Thereby, it can contribute to the space saving and cost reduction of the whole steelworks. In the example shown in FIG. 3, an example in which four reaction vessels 30 are placed on one carriage 32 is shown. However, the number placed on one carriage 32 is not limited to four. Furthermore, although the example which used the tunnel furnace was also shown for the heating furnace 40, it is not restricted to this, A rotary hearth furnace may be sufficient.

  The chromium-containing dust 24 filled in the reaction vessel 30 is held for a long time in a high-temperature atmosphere in the heating furnace 40. The atmospheric temperature in the heating furnace 40 is desirably an atmospheric temperature in the range of 1050 ° C. or higher and 1300 ° C. or lower. Note that if the atmospheric temperature is lower than 1000 ° C., the reduction may not proceed depending on the metal oxide, which is not preferable because the purity of the obtained metal is lowered. In particular, chromium oxide has a reduced reduction rate of chromium oxide when the ambient temperature is lower than 1000 ° C.

  Moreover, when atmospheric temperature exceeds 1300 degreeC, the powdery coke for antioxidant filled with the circumference | surroundings of chromium containing dust will be consumed, and the reduced chromium containing dust may be oxidized again. In addition, when the ambient temperature exceeds 1300 ° C., the metal sintering proceeds excessively and the strength thereof becomes too high, and the power consumption when pulverizing with the pulverization equipment 16 increases or the wear of the pulverizing tool increases. To do. On the other hand, when the ambient temperature is excessively high, a melt is generated, and the sagar 40 and the reduced sintered product may be fixed and the reduced sintered product may not be taken out.

  Accordingly, the inventors have studied the ambient temperature of the heating furnace 40 and found that chromium oxide can be reduced even when the ambient temperature is 1200 ° C. or lower. The reason why chromium oxide could be reduced even in a relatively low temperature atmosphere was that iron oxide was reduced by CO gas to produce metallic iron, and carbon derived from CO gas was deposited on the surface of the metallic iron. This is thought to be because chromium oxide in the vicinity of was reduced. Therefore, in the above, the atmospheric temperature in the heating furnace 40 is set in the range of 1050 ° C. or higher and 1300 ° C. or lower. However, the atmospheric temperature in the heating furnace suppresses generation of liquid-phase iron and excessive progress of metal sintering. Therefore, it is more preferable that the temperature be in the range of 1050 ° C. or higher and 1200 ° C. or lower. Regarding the holding time, it is desirable to hold for 24 hours or more. A holding time of less than 24 hours is not preferable because the reduction rate of the metal oxide is reduced.

  The reaction container 30 held for a long time in the high temperature atmosphere in the heating furnace 40 is carried out of the heating furnace 40 and cooled. The chromium-containing dust 24 filled in the reaction vessel 30 is reduced and sintered in the heating furnace 40 to reduce at least part of iron oxide and chromium oxide contained in the chromium-containing dust. become. Thereafter, the reduced sintered product 34 is taken out from the reaction vessel 30 by the take-out jig 50. The taken out reduced sintered product 34 is charged as an iron-making raw material into a converter in an oxidation refining process or a converter in a smelting reduction process, and chromium and iron contained in the chromium-containing dust 24 are recovered.

  In the method for producing an iron-making raw material according to the present embodiment, the chromium-containing dust 24 can be made into the reduced sintered product 34 by filling the reaction vessel 30 with the chromium-containing dust 24 and powdered coke and heating in the heating furnace 40. Thus, in the manufacturing method of the iron-making raw material which concerns on this embodiment, since chromium containing dust can be made into the reduction | sintering sintered compact 34, without using a binder etc., the increase in dust processing cost can be suppressed. In addition, since the chromium-containing dust can be made into a reduced sintered product 34 having high strength obtained by reducing a part of chromium oxide and iron oxide contained in the chromium-containing dust, an oxidation refining process using the reduced sintered product 34 as an iron-making raw material. Thus, chromium and iron can be recovered without increasing the amount of heat required for the reduction while suppressing the yield reduction due to pulverization, by charging the converter or the converter of the smelting reduction process.

  In addition, embodiment of this invention was demonstrated to the example of the process of the chromium containing dust generated from the converter of a smelting reduction process, and the converter of an oxidation refining process. However, the method for treating iron-making dust and iron-making sludge according to the present embodiment is not limited to chromium-containing dust, but can also be applied to the treatment of dust containing manganese oxide and nickel oxide. It can also be applied to the treatment of a slurry-like substance containing a metal called sludge generated in the pickling process or rolling process.

  Moreover, in this embodiment, although the example which fills the reaction container 30 with the chromium containing dust 24 and powdery coke was shown, since the chromium containing dust 24 which generate | occur | produced in the stainless steel refining process using the converter 10 contains carbon. It is not essential to fill with powdered coke. However, for example, slurry sludge containing a metal component generated in the pickling process or rolling process may not contain carbon. In this case, a reaction vessel is used to reduce the metal contained in the sludge. 30 is filled with powdered coke.

  Next, an embodiment in which reduction sintering processing is performed using the reduction sintering equipment 14 described with reference to FIGS. 2 and 3 will be described. Table 1 shows the composition of stainless steel dust used as an example, iron ore used as a comparative example, and powdered coke filled in a reaction vessel for antioxidant purposes.

In Table 1, T-Fe shows the iron content rate (mass%) in stainless steel dust, and M-Fe shows the metal iron content rate (mass%) in stainless steel dust. T-Cr represents the total chromium content (mass%) in the stainless steel dust, TC represents the total carbon content (mass%) in the stainless steel dust, SiO ₂ , Al ₂ O ₃ and CaO shows the content rate (mass%) of each substance contained in stainless steel dust. The same applies to iron ore and powdered coke.

  FIG. 4 is a graph showing a temperature rise profile of the heating furnace. The horizontal axis represents the residence time (h) of the reaction vessel in the furnace, and the vertical axis represents the temperature around the sample in the furnace (° C.). In this example, reduction sintering treatment was performed while changing the maximum temperature and holding time in FIG. 4, and the Fe metalization rate, the Cr metalization rate, and the strength of the reduction sintered product were confirmed. Table 2 shows the conditions and results of Examples and Comparative Examples.

  In Table 2, the maximum temperature (° C.) indicates the maximum temperature in the heating furnace 40. The holding time (h) indicates a time during which the heating furnace 40 is held at the maximum temperature. Fe metallization rate (mass%) shows the ratio reduced from iron oxide to metallic iron. Cr metallization rate (mass%) shows the ratio reduced from chromium oxide to metal chromium. In addition, ○ in the reduced sintered product strength indicates a situation where it was possible to obtain a massive reduced sintered product having a high strength, and × indicates a situation where the reduced sintered product could not be obtained as a high strength. . Here, the strength of the reduced sintered material is sufficient if it does not pulverize when transported to a blast furnace or converter, so that the drop strength (SI) specified in JIS M8711 is 70% or more. If it was less than 70%, it was evaluated as x.

  Comparative Example 1 shows the result of filling a reaction vessel 30 with iron ore and powdered coke and performing a reduction sintering process in a heating furnace 40. The Fe metallization rate was 90% by mass or more, and a reduced sintered product having sufficient strength was generated.

  First, the strength of the reduced sintered product will be described. From the results of Comparative Examples 2 to 5, it can be seen that if the maximum temperature of the heating furnace 40 is 1025 ° C. or less, a reduced sintered product having high strength cannot be generated from the stainless steel dust even if the holding time is 24 hours. Further, it can be seen that when the holding time is 18 hours or less, even if the maximum temperature is 1125 ° C., a reduced sintered product having high strength cannot be generated from the stainless steel dust. On the other hand, from the results of Examples 1 to 5 and 8 to 10, the maximum temperature of the heating furnace 40 is 1050 ° C. or higher and the holding time is 24 hours, so that a reduced sintered product having high strength can be generated from stainless steel dust. I understand. From these results, even without using a binder or the like, the maximum temperature of the heating furnace 40 is set to 1050 ° C. or more, and the holding time at the temperature is set to 24 hours or more, so that a high-strength reduced sintered product can be obtained from stainless steel dust. It was confirmed that it could be generated.

  Comparative Examples 2 and 3 and Examples 1 to 5 and 8 to 10 are examples in which the maximum temperature is changed. The highest Fe metallization rate was in Example 3 where the maximum temperature was 1125 ° C., and the Fe metallization rate was 95% by mass. When the temperature is lower than 1050 ° C., the temperature is low and the reduction of iron oxide is difficult to proceed, and when the temperature exceeds 1300 ° C., the powdery coke filled in the surrounding area is consumed, and the reduced metallic iron is reoxidized. Is considered to be the cause. Further, in Example 10 in which the maximum temperature was raised to 1350 ° C., a reduced sintered product having high strength could be produced from stainless dust, but the reduced sintered product was melted and fused to the container. Removal became difficult. From Table 2, in order to make the Fe metalization rate 90% by mass or more while maintaining the holding time at 24 hours, the maximum temperature may be set in the range of 1050 ° C. or more and 1200 ° C. or less, and the Fe metalization rate is set to 80% by mass. It can be seen that the maximum temperature may be set in the range of 1050 ° C. or higher and 1300 ° C. or lower in order to set it to% or higher.

  Comparative Examples 4 and 5 and Examples 3, 6, and 7 are examples in which the maximum temperature was 1125 ° C. and the holding time was changed. From these comparative examples and examples, it can be seen that the retention time should be 24 hours or longer in order to make the Fe metalization rate 90% by mass or more.

  As described above, by carrying out the method for producing an iron-making raw material according to the present embodiment, a massive reduction firing in which the metal oxide contained in the stainless steel dust is reduced in strength without using a binder from the stainless steel dust. It can produce a knot. Thus, it can be seen that a massive reduced sintered product having high strength can be generated from stainless steel dust without using a binder, so that an increase in dust treatment cost can be suppressed. In addition, by using a massive reduced sintered product with high strength and reduced metal oxide as an iron-making raw material, it is easy to charge into a blast furnace or converter, and it is possible to suppress a decrease in yield due to pulverization. It can be seen that chromium and iron can be recovered without increasing the amount of heat required for the process.

10: Converter 12: Dust collection equipment 14: Reduction sintering equipment 16: Grinding equipment 20: Screw feeder device 22: Hopper 24: Dust containing chromium 26: Screw 28: Funnel 30: Reaction vessel 32: Bogie 34: Reduction sintering Object 40: Heating furnace 50: Removal jig

Claims (8)

  The iron making dust and / or iron making sludge generated in the iron making process and the carbon material are mixed and filled into a reaction vessel, and the reaction vessel is kept in a state where oxygen is blocked with the iron making dust and / or iron making sludge. A method for producing an iron-making raw material, characterized in that a reduced sintered product obtained by heating and reducing at least a part of a metal content contained in the iron-making dust and the iron-making sludge is used as an iron-making raw material.   Filling a reaction vessel with carbon-containing iron-making dust and / or carbon-containing iron-making sludge generated in the iron-making process, heating the reaction vessel with the iron-making dust and / or iron-making sludge in a state of blocking oxygen, A method for producing an iron-making raw material, characterized in that a reduced sintered product obtained by reducing at least a part of the metal contained in the iron-making dust and the iron-making sludge is used as an iron-making raw material.   The method for producing an iron-making raw material according to claim 1 or 2, wherein the reaction vessel is heated at a maximum temperature in a range of 1050 ° C to 1300 ° C for 24 hours or more.   The method for producing an iron-making raw material according to claim 1 or 2, wherein the reaction vessel is heated at a maximum temperature in a range of 1050 ° C to 1200 ° C for 24 hours or more.   The said iron-making dust and / or iron-making sludge contains 1 or more types of the compound of iron, chromium, manganese, and nickel, The iron-making raw material as described in any one of Claims 1-4 characterized by the above-mentioned. Production method. The reaction vessel is heated using a heating furnace,
The said heating furnace is a tunnel furnace or a rotary hearth furnace, The manufacturing method of the iron-making raw material as described in any one of Claims 1-5 characterized by the above-mentioned.   The iron furnace raw material production according to claim 6, wherein in the heating furnace, a plurality of reaction vessels filled so that at least one content ratio of iron dust and / or iron sludge is different are simultaneously heated. Method.   In the heating furnace, a plurality of reaction vessels filled so that at least one kind of filled iron-making dust and / or iron-making sludge is different is heated at the same time. The manufacturing method of the iron-making raw material of description.