KR100976126B1 - molten reduced iron fabricating method and apparatus using the Fe-containing sludge - Google Patents

Abstract

The present invention relates to a method and apparatus for producing a low [S] molten reduced iron using iron by-products, to produce a low iron (S) molten reduced iron produced in a steel mill of high quality and to be capable of manufacturing for iron scrap Its purpose is to provide a rotating body which is rotatably provided with a driving force from a motor so that it can be manufactured into a pellet-shaped (gravel size) molding material according to the input of a mixture, and one end is connected to an outlet of the rotating body. The feed material is formed into a pellet form (gravel size) discharged to be discharged, and the feed material is connected to the other end and the inside of the transfer pipe so as to be in communication with each other. A melting furnace which is tilted in one direction and the other direction to remove and discharge suspended impurities due to melting the furnace, and the melting furnace A manufacturing apparatus comprising a cooling means for receiving the melt discharged from the cooling to cold water to produce a low [S] molten reduced iron, and a method for producing a low [S] molten reduced iron using the manufacturing apparatus Is achieved by.

Iron by-products, steelmaking sludge, steelmaking dust, mill scale, melting, cooling, low-melting reduction iron

Description

Mold reducing iron fabricating method and apparatus using the Fe-containing sludge

The present invention relates to a method and apparatus for manufacturing low [S] molten reduced iron using iron by-products, and more particularly, after mixing wet steel sludge, steelmaking dust, or wet steel sludge with mill scale, among iron-containing by-products generated in steel mills. , After molding the mixture containing moisture into the molding material in the rotating body, and then melting the molding material to the burner flame temperature in the melting furnace, and then cooling it to produce a low-melting reduced iron that can be reused. It relates to a method and apparatus for producing molten reduced iron.

In general, iron-containing by-products generated in steel mills include blast furnace sludge, steel mill sludge in steel mills, steel mill dust, hot rolled oil sludge, and mill scale.

Most of the sludge, dust and mill scales are industrial wastes, which have been manufactured and used as separate products for waste recycling.

However, the blast furnace sludge, steelmaking sludge, steelmaking dust, hot rolled oil sludge, mill scale, etc. of the blast furnace sludge are mostly powdery or contain a large amount of water and cannot be recycled alone. After mixing, it is compressed into a separate molding machine and manufactured in the form of briquettes.

Products manufactured and recycled in the form of briquettes as above are dust briquettes, Sludge Pressed Brick (SPB), CBP (Cold Bonded Pellet), MSP (Mill Scale Pellet) and recently manufactured in briquette form The only reduced products include HBI (Hot Briquette Iron) and DRI (Direct Reduced Iron), and these products, namely the dust briquettes, SPB, CBP, MSP, HBI, and DRI products, are used for housewives and blast furnaces. It is used as a raw material, a coolant in an electric furnace, an oxidizing agent, and a scrap metal replacement agent.

On the other hand, the steelmaking sludge generated in the steelmaking plant is dust is generated during the blowing process by the oxygen in the electric furnace, the dust is collected in the steelmaking dust in the case of dry dust in the case of wet dust sludge in the case of wet dust collection, wet dust collection The fine particles of about 60 μm or more are first sorted, and the fine particles of 60 μm or less are generated as a sludge cake after concentration and dehydration.

Such wet steel sludge contains a large amount of Fe and CaO components, but is a fine particle, has a high moisture content, reaches a moisture content (19-35%) of the OG sludge, and is impossible to be landfilled. Dry the dust (EP, EC, L / T Dust) and sludge and mix it with binders with high sulfur [S] content such as fine ore, cement, molasses, etc., and compress them by briquette method. CBP is prepared and mill scale is mixed with a binder to prepare and use MSP.

That is, the conventional general method for manufacturing dust briquettes or SPB, CBP using wet steel sludge is mixed with a wet steel sludge and a binder to fill the mixture into the frame of the briquetting device having a predetermined shape, By driving the briquetting device, the mixture filled in the mold is manufactured by compression molding. In addition, HBI and DRI products are formed by inserting a compression molded product into a reduction furnace and then heating the surface of the molded product at a furnace temperature of 1200 ° C. or higher. The solid phase is sintered and reduced to prepare molten reduced iron.

Products of the molten reduced iron produced by the method as described above are dust briquettes, CBP, SPB, MSP, HBI, DRI and the like as described above, looking at their components are shown in Table 1 below.

T.Fe CaO S Zn M-Fe Dust briquettes 62.8 10.6 0.160 0.32 1.33 CBP 42 10.0 0.248 0.54 0.32 SPB 58 0.37 0.073 0.78 3.25 MSP 70.8 0.14 0.027 0.12 0.32 DRI 77.7 11.7 0.023 0.18 60.8

However, when manufacturing dust briquettes, CBP, SPB using the main raw material of wet steel sludge as described above, molasses, cement, and ore used as binders are molten iron, and sulfur [S], a harmful component in molten steel, has a high molten iron, Since the quality of molten steel is impaired, the industry has no choice but to avoid its use.

In addition, as described above, after wet molding the steelmaking sludge through a briquetting device, the solid-state sinter reduction of the compression-molded molten reduced iron in the furnace is impossible, so that impurities are impossible to remove, resulting in poor product composition and weak strength. And differentiation and collapse easily occurs in the process of input into the furnace during use, as well as a problem that the use effect is significantly reduced, as well as a serious problem that is caused by the differentiation is easily generated by the differentiation and collapse.

In addition, as shown in Table 1, MSP molded through a briquetting apparatus and a furnace by mixing a mill scale and a bind has an iron oxide (Fe 2 O 3) state so that the M-Fe content is extremely low, even though it is manufactured as a product. There was a problem that can not be used as a substitute.

And, as described above, the product manufactured using the wet steel sludge and the mill scale as the main raw materials, after compression molding, is produced as a solid-phase sinter reduction through a briquetting device, so that only the surface of the raw materials is removed without removing impurities for the main raw materials. Since it is made of reduced iron, there is a problem that it is impossible to obtain a good quality molten reduced iron containing impurities.

Accordingly, the present invention has been made in order to solve the above problems, a mixture of wet steel sludge and steelmaking dust or wet steel sludge and mill scale and reducing agent and desorbent among iron-containing by-products generated in steel mills in the form of pellets It is made of molding material of (gravel size), and its molding material is completely melted by burner flame (2000 ℃) in a melting furnace of 1000 ℃ to remove suspended impurities, and then cooled to make it possible to manufacture low-melted reduced iron. Therefore, it is an object of the present invention to provide a method and apparatus for producing low [S] molten reduced iron using iron by-products to obtain high quality low [S] molten reduced iron.

In addition, another object of the present invention for solving the above problems is a pellet of a certain size in a mixture of wet steel sludge and steelmaking dust or wet steel sludge, mill scale and reducing agent and desorbing agent from the iron-containing by-products generated in steel mills It is made of molding material of (gravel size), and its molding material is completely melted by burner flame (2000 ℃) in 1000 ℃ melting furnace to remove suspended impurities and then cooled to make molten reducing iron. Manufacture of low [S] molten reduced iron using iron by-products that can produce high quality products, prevent differentiation and decay, and thus prevent pollution due to no dust generated when transporting and supplying low [S] molten reduced iron. A method and apparatus are provided.

In addition, another object of the present invention for solving the above problems is a pellet of a constant size in a mixture of wet steel sludge and steelmaking dust or wet steel sludge, mill scale and reducing agent and desorbing agent in the iron-containing by-products generated in steel mills It is made of shaped raw material in the form (gravel size), and its molding raw material is completely melted by a burner flame (2000 ° C.) in a 1000 ° C melting furnace to remove suspended impurities, and then cooled to prepare molten reduced iron. It is to provide a method and apparatus for producing a low [S] molten reduced iron using the iron-containing by-products that can be lowered, M-Fe content can be increased to enable the use of molten reduced iron for scrap iron.

The present invention for achieving the above object, in the apparatus for producing molten reduced iron with a low sulfur [S] content, high M-Fe content using iron-containing by-products, the inlet and outlet are formed at one end and the other end 10 to 30% by weight of steel-making sludge containing water, 50 to 60% by weight of mill scale, and 10 to 20% by weight of reducing agent mixed with aluminum or powdered coke and heavy oil and desulfurization agent 5 ~ 10% is added, and one end is connected to a rotating body rotatably provided by receiving a driving force from a motor so as to be manufactured into a pellet form (gravel size) according to the input of the mixed mixture. A feed pipe body provided to control the amount of pellets (gravel size) discharged to be discharged, and a molding material introduced by connecting the other end and the inside of the transport pipe body so as to communicate with the flame of the burner. The melting furnace is provided to be tilted in one side and the other direction to remove and discharge the floating impurities due to melting into the melt, and the melt discharged from the melting furnace is accommodated and cooled with cold water to produce molten reduced iron. Characterized in that it comprises a cooling means.

In addition, in the manufacturing apparatus, one end is connected in communication with the melting furnace and the other end is waste heat in communication with the rotating body so as to preheat the molding raw material which is put into the rotating body by using the waste heat generated in the melting furnace and manufactured as a molding material. It is characterized in that the supply pipe is further provided.

Another object of the present invention for achieving the above object is a method for producing molten reduced iron having a low content of sulfur [S] and a high M-Fe content by using iron-containing byproducts, wherein the iron-containing by-products contain water. Mixing the reducing agent into the steelmaking sludge and the steelmaking dust thus prepared, and preparing the mixture into pellets (gravel size) by forming the mixture into a rotating body which receives the driving force from the motor; And a step of injecting the molding raw material produced by the rotating body into the melting furnace through a conveying tube, melting the molding raw material introduced into the melting furnace into a melt using flame heat heated from a burner, and the melting furnace. To remove the suspended impurities due to melting by tilting to one side, and tilting the melting furnace to the other side to remove impurities. And the step to inject the melt been removed twos cooling, was cooled by supplying cold water to the melt injected twos the cooling made in a step for producing a molten reduced iron is characterized.

Here, the mixture is 10 to 30% by weight of steel-making sludge containing water, 50 to 60% by weight of mill scale, 10 to 20% by weight of reducing agent mixed with aluminum or powdered coke and heavy oil, and desulfurization agent 5 which is finely divided CaO. It is characterized by consisting of ~ 10%.

In addition, the mixture is 10-30% by weight of steelmaking sludge containing water, 50-60% by weight of steelmaking dust, 10-20% by weight of reducing agent mixed with aluminum or powdered coke and heavy oil, and desulfurization agent 5 which is finely divided CaO. Characterized in that the mixture is made of ~ 10% by weight.

According to the method and apparatus for producing low [S] molten reduced iron using the iron-containing by-product according to the present invention as described above, wet steel sludge and steelmaking dust or wet steel sludge, mill scale and reducing agent and dehydration of iron by-products produced in steel mills The mixture I mixed is made into a pellet of a certain size (pebbles size), and the molding material is melted completely by a burner flame in a 1000 ℃ melting furnace to remove suspended impurities and then cooled by low [S]. Since it is made of molten reduced iron, there is an effect of obtaining a high quality low [S] molten reduced iron.

In addition, according to the method and apparatus for producing low [S] molten reduced iron using the iron by-product according to the present invention, wet steel sludge and steelmaking dust or wet steel sludge, mill scale and reducing agent and desorbing agent is mixed in the iron by-product generated in the steel mill The prepared mixture into pellets of a certain size (gravel size), and the molding material is completely melted by a burner flame in a furnace at 1000 ° C. to remove suspended impurities, and then cooled and then cooled. Since it is manufactured as, the differentiation and collapse does not occur, there is no effect of dust generation when the transport and low [S] molten iron is added there is an effect that can prevent the environmental pollution.

In addition, according to the method and apparatus for producing low [S] molten reduced iron using the iron by-product according to the present invention, wet steel sludge and steelmaking dust or wet steel sludge, mill scale and reducing agent and desorbing agent is mixed in the iron by-product generated in the steel mill The prepared mixture into pellets of a certain size (gravel size), and then melt the molds by a burner flame in a 1000 ℃ melting furnace to remove suspended impurities and cool them by cooling. Since it is made of reduced iron, the content of sulfur [S] is lowered, and the M-Fe content can be increased, so that the low [S] molten reduced iron can be used for scrap metal.

Hereinafter, an embodiment of a method and apparatus for producing low [S] molten reduced iron using an iron-containing by-product according to the present invention will be described in detail.

First, it should be noted that in the drawings, the same components or parts denote the same reference numerals as much as possible. In describing the present invention, detailed descriptions of related well-known functions or configurations are omitted in order not to obscure the subject matter of the present invention.

Prior to describing the drawings, the basic concept of the present invention is to lower the content of sulfur (S) by making it possible to produce a low [S] molten reduced iron by completely melting in the melting furnace using iron-containing by-products to remove suspended impurities, The M-Fe content can be increased to obtain high quality low [S] molten reduced iron, and it can be easily prevented from being broken because it is completely melted and cooled, thereby preventing environmental pollution. .

Next, with reference to the accompanying drawings will be described a preferred embodiment of a method and apparatus for producing a low [S] molten reduced iron using the iron-containing by-product according to the present invention having the above basic concept.

1 is a view showing an apparatus for producing low [S] molten reduced iron using the iron-containing by-product according to the present invention.

As shown, the apparatus 100 for manufacturing molten reduced iron using iron-containing by-products according to the present invention forms an inlet 110a and an outlet 110b at one end and the other end of the steel-making sludge 10-containing moisture in the iron-containing by-products. Reducing agent 30% by weight, 50-60% by weight of mill scale and aluminum or powdered coke and heavy oil (or a mixture of these aluminum and powdered coke and heavy oil) to remove oxygen when produced from low [S] molten iron ˜20% by weight and 5-10% of desulfurization agent, which is finely divided CaO to remove sulfur (S), are added to form pellets (gravel size) according to the input of the mixed mixture (A). Molded raw material of the pellet form (gravel size) is discharged by being connected to one end of the rotating body 110 and the discharge port 110b of the rotating body 110 is provided to receive the driving force from the motor 111 to enable (B) the conveying pipe body 130 is provided to control the amount of feed and the The other end and the inside of the transport pipe 130 is connected in communication with each other to remove and discharge the floating impurities (D) due to melting the incoming raw material into the melt (C) by the flame of the burner 151. Melting furnace 150 is provided to be tilted in one side and the other direction, and the melt (C) discharged from the melting furnace 150 is accommodated and cooled in cold water as shown in Figure 3, that is, low [S] melting It comprises a cooling means 150 is provided for producing reduced molten iron (MRI) (E) (E).

In addition, one end is in communication with the melting furnace 150 to preheat the molding raw material (B), which is introduced into the rotating body (110) using the waste heat generated in the melting furnace (150) and manufactured as the molding raw material (B). Is connected and the other end is further provided with a waste heat supply pipe 190 to communicate with the rotating body (110).

Here, the transfer pipe body 130 is installed below the rotating body 110, the melting furnace 150 will be preferably installed above the cooling means 170.

Hereinafter will be described in more detail with respect to the manufacturing apparatus of low [S] molten reduced iron using the iron-containing by-product according to the present invention described above.

First, the rotating body 110 is a molding raw material (B) having a pellet size (gravel size) of a constant size as shown in Figure 2 while rotating the mixture (A) introduced as shown in Figure 1 The outer circumferential surface is rotatably connected to the rotating part 111a of the motor 111 provided to be driven by application of power.

In addition, the rotating body 110 is inclined downwardly from the inlet 110a so that the outlet (110b) side to automatically discharge the molding material (B) manufactured in pellet form (gravel size) to the outlet (110b) while rotating. , 5 to 10 ° is provided to be inclined.

The transfer pipe body 130 is provided to transfer the molding material (B) discharged through the outlet 110b of the rotating body 110 to the melting furnace 150, as shown in FIG. The hopper 131 is provided to collect the molding material (B) is discharged through the one end close to the discharge port (110b), and one end is connected to the other end of the hopper 131 and the other end is the melting furnace 150 and In a position in which the pipe is communicatively connected and close to the hopper 131, an input amount control valve 133 which is driven by power is installed to control the amount of the molding material B transferred to the melting furnace 150. It is composed of a transfer pipe 135 is provided.

The melting furnace 150, by melting the molding material (B) transferred through the conveying tube body 130 to the flame of the burner 151 using the skimmer for removal shown in FIG. After removal is configured to be discharged to the cooling means 170 side.

That is, the melting furnace 150 is connected to the other end of the transfer pipe 135 of the transfer pipe body 130, as shown in Figures 1 and 4 to 6 and the connection, The waste heat connecting pipe 153 connected to one end of the waste heat supply pipe 190 on one side of the pipe 152 is placed in the upper surface, and the burner 151 penetrates to one side of the waste heat connecting pipe 153. The cover 154 and the cover 154 which are provided at the upper and lower ends of the wire 155 having one end connected to both ends of the upper surface of the cover 154 so as to move up and down. The melting motor 156, the dissolving body 157, the upper portion of which is opened and closed by the cover portion 154, and the piston 158a having one end hinged to one side of the outer surface of the dissolving body 157. The piston 158a is provided to linearly reciprocate to accommodate the other end of the piston to correspond to the inflow and outflow of the compressed air. A base member 159 provided with a pneumatic cylinder 158 and the dissolving body 157 on the upper part so that the dissolving body 157 can be tilted to one side and the other side to correspond to the driving of the cylinder 158. )

Here, the heat source of the burner 151 is provided to melt by directly applying heat to the molding material (B) flowing into the melting body 157 with a flame, COG, O ₂ , LPG, LNG, heavy oil Either of which is used in admixture with air.

The cooling means 170, which is provided for producing the melt (C) discharged from the melting body 157 of the melting furnace 150 to the molten reducing iron (E), the melting body of the melting furnace 150 Cooling tank 171 for accommodating the melt (C) discharged from the 157, and the cold water is supplied to the melt (C) accommodated in the cooling tank 171 by using a supply pump (not shown) The cooling water supply pipe 173 and the cooling water injection nozzle 175 are formed.

In addition, the drain pipe 177 and the storage tank 179 are further provided to discharge and store the cooling water injected into the cooling tank 171 to be reused.

The waste heat supply pipe 190 is a waste heat connection pipe provided on the upper surface of the cover part 154 of the melting furnace 150 to supply the waste heat generated and discharged from the melting furnace 150 to the rotating body 110. One end is connected to the other end of the waste heat supply connecting pipe 191 and the other end of the waste heat supply connecting pipe 191 and the other end is piped in communication with the rotating body 110, one end is connected to the (153). The waste heat supply fan 193, which can be driven by application of power during piping, is provided as a waste heat supply pipe 195 provided therein.

On the other hand, the above mixture is 10-30% by weight of steel-making sludge containing water, 50-60% by weight of mill scale, and aluminum or powdered coke and heavy oil (or these aluminum, powdered coke and heavy oil) ) 10 to 20% by weight of reducing agent, 5 to 10% of desulfurization agent, which is finely divided CaO, but not limited to 10 to 30% by weight of steel-making sludge containing water, and 50 to 60% by weight of steelmaking dust Or it may be made by mixing 10-20 weight% of reducing agents which mixed powdered coke and heavy oil (or these aluminum, powdered coarse and heavy oil), and 5 to 10% of desulfurizing agents which are fine powder CaO.

The method for producing molten reduced iron having a low sulfur [S] content and a high M-Fe content through the apparatus for producing molten reduced iron using the iron-containing by-product according to the present invention, as shown in FIG. Step (S100) for producing a mixture (A) by mixing a reducing agent in the steel-making sludge and steelmaking dust containing water in the by-products (S100), and the mixture (A) is rotated by receiving a driving force from the motor 111 Step (S200) for producing a raw material (B) in the form of pellets (gravel size) by putting in the (110) and the molding material (B) manufactured by the rotating body 110 for transporting tube 130 Step (S300) for the introduction into the melting furnace 150 through the, and the raw material (B) injected into the melting furnace 150 for directly melting the melt (C) using the heat of flame heated from the burner 151 Step (S400) and the melting furnace 150 by tilting to one side to melt the phosphorus Step (S500) for removing the suspended impurities (D), and injecting the melt (C) from which the impurities (D) have been removed to the cooling tank 171 by tilting the melting furnace 150 to the other side (S600) And a cold water supplied to the melt (C) introduced into the cooling tank (171) to cool the molten reduced iron (E) (S700).

The mixture is 10-30% by weight of water-containing steelmaking sludge, 50-60% by weight of mill scale, and mixed with aluminum or powdered coke and heavy oil (or these aluminum and powdered coke) to remove oxygen when manufactured from molten iron. And 10 to 20% by weight of a reducing agent mixed with heavy oil and 5 to 10% of a desulfurizing agent which is CaO of fine powder for removing sulfur (S).

In this case, when the steel-making sludge containing water is mixed at 10 wt% or less, the mixture is in a powder state, and thus the raw material is not formed, and when the mixture is mixed at 30 wt% or more, the mixture is too thin to form a rotating body. Since it will not be produced as a molding raw material, it is preferable to mix at 10 to 30% by weight as described above. At this time, the steelmaking sludge becomes the dynamics of the binder.

In addition, when the mixture of the reducing agent and the desulfurization agent is mixed at least 20% by weight and at least 10% by weight, respectively, since the real rate decreases, as described above, the reducing agent is mixed at 10-20% by weight and the desulfurization agent is 5-10%. It is preferable.

In addition, it is preferable to use the steelmaking sludge containing 5 to 30% of water, and when the content of water is 5% or less, raw material is not formed in the rotating body, and 30% by weight or more of the mixture is mixed. This is because the mixture is so thin that it is difficult to produce a molding material from the rotating body.

In addition, the mixture is 10-30% by weight of steelmaking sludge containing water, 50-60% by weight of steelmaking dust, and a reducing agent mixed with aluminum or powdered coke and heavy oil (or mixed with aluminum, powdered coke and heavy oil). It may be made by mixing with 10% by weight and 5 to 10% of a desulfurization agent which is finely divided CaO.

When the molten reduced iron is to be manufactured through the apparatus 100 for manufacturing molten reduced iron using the iron-containing by-product according to the present invention, the steelmaking sludge containing 20% moisture as shown in FIGS. 1 to 7 is provided. 20% by weight of the mill scale 55 to 15% by weight of the reducing agent and 10% by weight of the desulfurization agent (S100) of the rotating body 110 is rotated by receiving the driving force of the motor 111 is prepared (S100) Injected into the inlet (110a).

The mixture A introduced into the rotating body 110 is formed of pellets (gravel size) as shown in FIG. 1 by the rotating body 110 inclined downward at an angle of 10 degrees to the outlet 110b. B) while being manufactured (see FIG. 2) while being preheated by the waste heat supplied through the waste heat supply pipe 195 of the waste heat supply pipe 130 connected to the melting furnace 150 is discharged through the outlet 110b (S200). .

Molding material (B) discharged through the outlet (110b) is a connecting pipe provided on the hopper 131 and the transfer pipe 135 and the cover 154 of the melting furnace 150 of the transfer pipe body 130 ( 152 is introduced into the dissolving body 157 and a predetermined amount is introduced (S300), thereby driving the input amount control valve 133 in the transfer pipe 135 to block the transfer pipe 135.

While the molding material B is introduced into the melting furnace 150 as described above, the molding material introduced into the flame of the burner 151 fueled with LNG is melted (S400).

When the molding material B is changed into the melt C by the burner 151, the cover motor 156 is driven in the reverse direction to lift the cover part 154 from the surface of the melting body 157. The pneumatic cylinder 158 is driven to remove the suspended impurities D generated by melting.

When the piston 158a moves to the inside of the pneumatic cylinder 158 by the driving of the pneumatic cylinder 158, as shown in Figure 2 dissolution body 157 is connected to one end of the piston 158a The other end is inclined downward by the end of hearing.

When the dissolution body 157 is inclined as described above, the suspended impurities D are removed using a skimmer (S500).

When the impurities D suspended in the melt C are removed as described above, the pneumatic cylinder 158 is driven again to take out the piston 158a from the high pressure cylinder 158.

Due to the sunrise of the piston 158a, the dissolving body 157 is inclined downward as shown in FIG. 3, and thus the melt C stored in the dissolving body 157 is formed of the cooling means 170. It is poured into the cooling tank 171 (S600).

 When the melt C is poured into the cooling tank 171, the supply pump is driven to spray the cooling water stored in the storage tank 179 to the cooling tank 171 through the cooling water supply pipe 173 and the cooling water injection nozzle 175. .

As the cooling water is injected into the melt (C) stored in the cooling tank 171, it is solidified as shown in Figure 1 is made of a molded body, that is, molten reduced iron (E) (see Figure 3) (S700).

At this time, as the quenching is performed according to the cooling rate of the melt C, the size becomes smaller, and as the quenching becomes larger, the size becomes larger.

When the molten reduced iron is manufactured by melting the molten iron completely in the melting furnace using the mixture as described above, the content of sulfur [S] is lowered and the M-Fe content can be increased as shown in Table 2 below. )

SiO ₂ MnO T-Fe FeO M-Fe Pure FeO Fe2O3 C S 0.95 0.65 95.47 66.65 94 86.24 9.52 0.057 0.006

Meanwhile, 10 to 30% by weight of steel-making sludge containing water, 60 to 80% by weight of steelmaking dust, and cement, molasses, and fine ore are mixed with 20 to 30% by weight of binders. It can be made of dust briquettes, CBP, SPB, which can be compressed into sugar ore using a mixture, and also has MSP products that are settled with briquettes by mixing 60-70 wt% of mill scale and 30-40 wt% of cement. The description thereof will be omitted.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the inventions. It will be clear to those who have knowledge of.

1 is a view showing an apparatus for producing low [S] molten reduced iron using the iron-containing by-product according to the present invention

2 is a view showing a molding material produced by a rotating body in the manufacturing apparatus of low [S] molten reduced iron using the iron-containing by-product according to the present invention

3 is a view showing a low [S] molten reduced iron produced by a low [S] molten reduced iron manufacturing apparatus using the iron-containing by-product according to the present invention

Figure 4 is a view showing a state for removing impurities in the molten melt in the melting furnace of the manufacturing apparatus of low [S] molten reduced iron using the iron-containing by-product according to the present invention

5 is a view illustrating a state in which a molten melt is poured into a cooling bath through a melting furnace of a manufacturing apparatus of low [S] molten reduced iron using an iron-containing by-product according to the present invention.

6 is a view showing a melting furnace of a low [S] molten reduced iron manufacturing apparatus using the iron-containing by-product according to the present invention

7 is a flow chart for elucidating a method for producing a low [S] molten reduced iron using the iron-containing by-product according to the present invention

* Description of the symbols for the main parts of the drawings *

100; Melting and reducing iron manufacturing apparatus

110; Rotating body

130; Transfer pipe

150; Melting furnace

170; Cooling means

190; Waste heat supply pipe

Claims (11)

In the apparatus for producing molten reduced iron having a low sulfur [S] content, high M-Fe content using iron-containing by-products, The inlet 110a and the outlet 110b are formed at one end and the other end, and 10 to 30% by weight of steel-making sludge containing water in the iron-containing byproduct, 50 to 60% by weight of mill scale, and aluminum or powdered coke and heavy oil are mixed. 10 ~ 20% by weight of reducing agent and 5 ~ 10% of desulfurization agent, which is finely divided CaO, can be added and rotated by receiving driving force from motor 111 so that it can be manufactured into molding material (B) according to input of mixed mixture (A). Rotating body 110 is provided to; A conveying tube body 130 having a controllable amount of conveying the amount of the molded raw material B which is connected to the discharge port 110b of the rotating body 110 and discharged; The other end and the inside of the transfer pipe 130 is connected in communication with each other to remove and discharge the floating impurities (D) caused by melting the incoming molding material into the melt (C) by the flame of the burner 151. Melting furnace 150 is provided so as to be tilted in one direction and the other direction; Cooling means 150 is provided to receive the melt (C) discharged from the melting furnace 150 to cool with cold water to produce a molten reducing iron (E); Apparatus for producing low [S] molten reduced iron using iron by-products, characterized in that made. The method of claim 1, One end is connected in communication with the melting furnace 150 to preheat the molding raw material B, which is introduced into the rotating body 110 using the waste heat generated in the melting furnace 150 and manufactured as the molding raw material B. The other end of the low [S] molten reduced iron manufacturing apparatus using iron by-products, characterized in that the waste heat supply pipe 190 is further provided in communication with the rotating body (110). The method of claim 1, The rotating body 110 and the rotating portion (111a) of the motor 111, which is provided to be driven by applying power to the outer peripheral surface so as to be able to manufacture a molding material (B) having a certain size while rotating the mixture (A) and Is connected and rotatably provided, so that the discharge port (110b) side is inclined downward than the inlet (110a), that is, 5 ~ 10 ° to enable automatic discharge of the molding material (B) manufactured during the rotation to the discharge port (110b) side Apparatus for producing low [S] molten reduced iron using iron by-products, characterized in that provided. The method of claim 1, The transfer pipe body 130, the hopper 131 is provided to collect the molding material (B) is discharged through one end close to the discharge port (110b), and one end to the other end of the hopper 131 Connected and the other end is piped in communication with the melting furnace 150, the position close to the hopper 131 is driven by applying power to control the amount of the raw material (B) to be transferred to the melting furnace 150 Low [S] molten reduced iron manufacturing apparatus using the iron-containing by-products, characterized in that consisting of a feed pipe 135 is provided with an injection amount control valve 133 is installed. The method of claim 1, The melting furnace 150, the connection pipe 152 is connected to the other end of the transfer pipe 135 of the transfer pipe body 130, one end of the waste heat supply pipe 190 on one side of the connection pipe 152 The cover part 154 and the cover part 154 provided through the burner 151 through one side of the waste heat connecting pipe 153 connected to the upper surface and placed in the waste heat connecting pipe 153. The cover opening / closing motor 156 and the cover part 154, which are provided to be capable of forward and backward driving, by winding the other end of the wire 155 having one end connected to both ends of the upper surface to move up and down. Dissolving body 157 which is provided to be opened and closed and the other end of the piston 158a hinged at one end to one side of the outer surface of the dissolving body 157 to correspond to the inflow and outflow of the compressed air A cylinder 158 provided with a linear reciprocating motion 158a and a dissolving body 157 mounted thereon. Low [S] molten iron using the iron by-product by characterized in that the base body 159 is provided so that the dissolution body 157 can be tilted to one side and the other side to correspond to the driving of the cylinder 158 Manufacturing equipment. The method of claim 1, The cooling means 170, the cooling tank 171 for accommodating the melt (C) discharged from the dissolution body 157 of the melting furnace 150, and the melt (C) accommodated in the cooling tank 171 Cooling water supply pipe (173) having a cooling water injection nozzle 175 is provided to enable the supply and injection of cold water to the supply pump to the discharged cooling water injected to the cooling tank 171 is provided to be reused Low [S] molten reduced iron production apparatus using the iron-containing by-products, characterized in that consisting of a drain pipe (177) and the storage tank (179). The method of claim 2, The waste heat supply pipe 190 is connected to the waste heat supply pipe 191 whose one end is connected to the melting furnace 150 to supply waste heat generated and discharged from the melting furnace 150 to the rotating body 110. One end is connected to the other end of the waste heat supply connector 191 and the other end is connected to the rotating body 110 so as to be connected to the rotating body 110 so as to supply waste heat. 193) is an apparatus for producing low [S] molten reduced iron using iron by-products, characterized in that consisting of a waste heat supply pipe (195) is provided. The method of claim 1, The mixture is 10 to 30% by weight of steelmaking sludge containing water, 50 to 60% by weight of steelmaking dust, 10 to 20% by weight of reducing agent mixed with aluminum or powdered coke and heavy oil, and desulfurization agent 5 to 10 which is finely divided CaO. Apparatus for producing low [S] molten reduced iron using iron by-products, characterized in that the mixture by weight%. In the method for producing molten reduced iron having a low content of sulfur [S] and high M-Fe content using iron-containing by-products, Step (S100) for preparing a mixture (A) by mixing a reducing agent and a desulfurizing agent in the steelmaking sludge and steelmaking dust containing water in the iron-containing by-products; A step (S200) for preparing the raw material (B) by mixing the mixture (A) with the driving force received from the motor (111) and rotating the rotating body (110); A step (S300) for inserting the molding material (B) manufactured by the rotating body (110) into the melting furnace (150) through the conveying tube body (130); A step (S400) of melting the raw material (B) injected into the melting furnace (150) into the melt (C) by using the flame heat heated from the burner (151); A step (S500) for removing impurities (D) suspended by melting the melting furnace 150 to one side; Tilting the melting furnace 150 to the other side to introduce the melt C from which impurities D are removed into the cooling bath 171 (S600); Low [S] molten reducing iron using iron-containing by-products, characterized in that it comprises the step (S700) for supplying cold water to the melt (C) introduced into the cooling tank 171 to produce a molten reducing iron (E). Manufacturing method. 10. The method of claim 9, The mixture is 10 to 30% by weight of steel-making sludge containing water, 50 to 60% by weight of mill scale, 10 to 20% by weight of reducing agent mixed with aluminum or powdered coke and heavy oil, and 5 to 10% of desulfurization agent which is finely divided CaO. Method for producing a low [S] molten reduced iron using the iron-containing by-products, characterized in that it is mixed with. 10. The method of claim 9, The mixture is 10 to 30% by weight of steelmaking sludge containing water, 50 to 60% by weight of steelmaking dust, 10 to 20% by weight of reducing agent mixed with aluminum or powdered coke and heavy oil, and 5 to 10% by weight of finely divided CaO. A method for producing low [S] molten reduced iron using iron by-products, characterized in that the mixture is made in%.

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