KR100948926B1 - Method for manufacturing molten iron comprising nickel - Google Patents

Abstract

The present invention relates to a method for producing nickel-containing molten iron. The method for producing nickel-containing molten iron includes i) sintering nickel oxide ore to provide nickel sintered ore, ii) charging a mixture comprising nickel sintered ore, boron oxide content, alumina content, and coke to the blast furnace, iii ) Blowing hot air into the blast furnace to produce nickel-containing molten iron and slag, and iv) removing nickel-containing molten iron and slag from the blast furnace.

Nickel-containing molten iron, boron oxide, alumina, melting point, fluorspar, slag, fluidity

Description

Process for producing nickel-containing molten iron {METHOD FOR MANUFACTURING MOLTEN IRON COMPRISING NICKEL}

The present invention relates to a method for producing nickel-containing molten iron that can improve the flowability of slag without using fluorspar.

Recently, nickel prices have surged due to the depletion of nickel sulfide ore used as a raw material for nickel. Therefore, the price of stainless steel using nickel as an element for improving the corrosion resistance is also greatly increased. As a result, a method of producing nickel-containing molten iron by using nickel oxide ore directly in a blast furnace has been developed.

In the case of manufacturing molten iron by directly charging nickel oxide ore into the blast furnace, since nickel oxide ore includes a large amount of gangue, a large amount of gangue is included in the slag, thereby reducing the fluidity of the slag and unstable yellowing. Coke is also used in large quantities. In particular, in the case of manufacturing nickel-containing molten iron, the amount of slag in the blast furnace is about 6 times as large as the amount of slag contained in ordinary molten iron. As a result, starting of nickel-containing molten iron is difficult due to slag. Therefore, dolomite or fluorspar is charged together to improve the fluidity of slag. However, when using fluorspar, many problems arise in subsequent processes due to the fluorine contained in the fluorspar.

When fluorite is charged into the blast furnace, fluorine is vaporized and flows to the dust collector installed on the blast furnace. Therefore, the dust collecting apparatus may be corroded by fluorine. In addition, the fluorspar contains fluorine, which is harmful to the human body. If the fluorspar is included in the slag, the slag cannot be reused. In other words, if the slag is used in marine structures, and the fluorspar is included in the slag, the slag cannot be used again due to environmental pollution. Moreover, if fluorine is included in the flue-gases emitted from the blast furnace, the air can be polluted.

It is to provide a method for producing nickel-containing molten iron that can improve the flowability of slag without using fluorspar.

Nickel-containing molten iron manufacturing method according to an embodiment of the present invention, i) sintering nickel oxide ore to provide nickel sintered ore, ii) nickel sintered ore, boron oxide containing, alumina containing, and a mixture comprising coke Charging to the blast furnace, iii) blowing hot air into the blast furnace to produce nickel-containing molten iron and slag, and iv) drawing out nickel-containing molten iron and slag from the blast furnace.

In the step of charging the mixture into the blast furnace, the boron oxide content and the alumina content may be 1 wt% to 25 wt% of the mixture. In the step of charging the mixture into the blast furnace, a mixture of boron oxide content and alumina content is charged to the blast furnace, and the weight ratio of the boron oxide content and alumina content in the mixture may be 20:80 to 80:20. .

In the step of charging the mixture into the blast furnace, the boron oxide content may comprise B ₂ O ₃ and the alumina content may comprise Al ₂ O ₃ . In the step of drawing out nickel-containing molten iron and slag, the amount of boron oxide in the slag may be 1wt% to 10wt%, and the amount of alumina may be 5wt% to 20wt%. The melting temperature of the slag may be 1100 ° C to 1400 ° C.

Nickel-containing molten iron manufacturing method according to an embodiment of the present invention may further include the step of blowing the mixed fine powder containing boron oxide and alumina into the blast furnace through the side of the blast furnace. The particle size of the boron oxide and alumina may be 0.05 mm to 0.2 mm.

In the step of charging the mixture into the blast furnace, the boron oxide contained in the boron oxide content may be 5wt% to 100%, and the alumina contained in the alumina containing material may be 20wt% to 100%. In the step of charging the mixture into the blast furnace, a mixture of boron oxide content and alumina content is charged to the blast furnace, and the particle size of the mixture may be 0.2 mm to 20 mm.

As described above, in the embodiment of the present invention, by using a boron oxide content and alumina content instead of fluorite, it is possible to easily manufacture nickel-containing molten iron by improving the fluidity of the slag. In addition, the problem of environmental pollution due to fluorspar does not occur, thereby improving slag recyclability.

With reference to the accompanying drawings, it will be described embodiments of the present invention to be easily implemented by those skilled in the art. As can be easily understood by those skilled in the art, the embodiments described below may be modified in various forms without departing from the concept and scope of the present invention. Where possible the same or similar parts are represented with the same reference numerals in the drawings.

Unless defined otherwise, all terms including technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. Commonly defined terms used are additionally interpreted to have a meaning consistent with the related technical literature and the presently disclosed contents, and are not interpreted in an ideal or very formal sense unless defined.

1 is a flow chart schematically showing a method for manufacturing nickel-containing molten iron according to an embodiment of the present invention.

Method for producing nickel-containing molten iron according to an embodiment of the present invention, the step of providing a nickel sintered ore (S10), the step of charging a mixture containing nickel sintered ore, boron oxide containing, alumina containing, and coke to the blast furnace (S20), blowing hot air into the blast furnace to produce nickel-containing molten iron and slag (S30), and nickel-containing molten iron and slag (S40). In addition, other steps may be further included as necessary. For example, the method for producing nickel-containing molten iron may further include a step of blowing the mixed fine powder containing boron oxide and alumina into the blast furnace through the side of the blast furnace.

First, in step S10, nickel oxide ore is sintered to manufacture nickel sintered ore. Nickel oxide ore is formed by the weathering of rocks containing a large amount of nickel at the surface, and the nickel-containing solution separated and leaching below the surface. Examples of the nickel oxide light include garnierite ore or laterite ore, limonite ore, and saprolite ore.

When the nickel sintered ore is directly charged into the blast furnace, the fuel cost increases, and the real rate of nickel-containing molten iron may decrease. Therefore, by sintering nickel oxide ore to produce nickel sintered ore, it is produced in a state suitable for blast furnace charging. Alternatively, nickel oxide light may be shortened and used. That is, the nickel oxide ore can be dried and crushed, and can be produced as briquettes in a quencher.

The particle size variation of nickel oxide ore collected from the mountain region can be large. Therefore, after classifying nickel oxide ore into fine nickel or granulated nickel ore, the granulated nickel ore is crushed and adjusted to a uniform size, thereby increasing the use efficiency. For example, when the particle size is 5 mm or less based on the particle size of 5 mm of nickel ore, it may be classified as fine nickel ore, and when the particle size exceeds 5 mm, it may be classified as granulated nickel ore. Here, the granulated nickel ore can be produced again as fine nickel ore by pulverizing using a grinder or the like.

As described above, coke may be mixed in order to sinter nickel oxide ore whose size is uniform by classifying and regrinding. Coke in powder form may be used. In this case, the nickel oxide ore is mixed with the coke powder, charged into a kneader or the like, and rotated to prepare a sintering mixture in which the nickel oxide ore and the coke powder are evenly mixed. Next, the mixture for sintering is put into a sintering machine and sintered to manufacture nickel sintered ore.

In step S20, after preparing a mixture to be loaded into the blast furnace to prepare molten iron, it is charged into the blast furnace. Here, the mixture includes nickel sintered ore, boron oxide containing, alumina containing and coke. The coke is mixed evenly with the nickel sintered ore and charged in the blast furnace to reduce the nickel sintered ore.

The boron oxide content and alumina content can be made into a premixed mixture and mixed with nickel sintered ore and coke. In this case, the boron oxide content and the alumina content may be mixed to briquette or premelt to prepare a flux form. Alternatively, the boron oxide content and alumina content may be supplied separately and then mixed with nickel sintered ore and coke.

Nickel sintered ore includes a large amount of gangue, and a large amount of gangue is included in slag in the manufacture of molten iron. When the slag contains a large amount of gangue, the slag melt dripping capacity is reduced in the blast furnace not only well discharged, but also the slag fluidity is reduced, it is difficult to go out. Therefore, by charging boron oxide and alumina into the blast furnace as a solvent, it is possible to improve the melt dripping ability of the slag in the blast furnace, and to improve the fluidity while lowering the melting point of the slag. And the viscosity of slag can be reduced. Therefore, the starting work becomes easy. And unlike fluorspar, the subsequent processes can be carried out smoothly, and there is no environmental pollution problem. By using boron oxide and alumina as substitutes for fluorspar, slag produced in the blast furnace can be easily removed.

As the boron oxide content, ore such as colemanite or boracite can be used. On the other hand, as the boron oxide content, it is also possible to use a flux which has been refined. The boron oxide content includes 5 wt% to 100% boron oxide. When the boron oxide content contains less than 5 wt% boron oxide, the amount of boron oxide is too small to improve the flowability of the slag. The boron oxide content mainly comprises B ₂ O ₃ . B ₂ O ₃ helps the slag melt down well in the blast furnace. In addition, B ₂ O ₃ in an amount substantially equal to the amount charged into the blast furnace is contained in the slag to increase the flowability of the slag while reducing the melting point of the slag.

The alumina content may include bauxite ore or ladle slag. On the other hand, the flux after the refining process can also be used as an alumina content. The alumina content comprises 20 wt% to 100% alumina. If the amount of alumina is less than 20wt%, the amount of alumina is too small to improve the flowability of slag. The alumina content mainly comprises Al ₂ O ₃ . Al ₂ O ₃ helps the slag melt down well in the blast furnace. In addition, Al ₂ O ₃ in an amount almost equal to the amount charged into the blast furnace is contained in the slag, thereby improving the flowability of the slag while reducing the melting point of the slag. In particular, a high melting point of the Al ₂ O ₃ Al ₂ O ₃ is not well-reduced, while maintaining the oxidation state as it can be incorporated in the slag.

When charging the mixture of the boron oxide content and the alumina content in the blast furnace, the weight ratio of the boron oxide content and the alumina content may be 20:80 to 80:20. If the weight ratio of the boron oxide content and the alumina content is outside the above-mentioned range, the fluidity of the slag cannot be improved. Therefore, the boron oxide content and the alumina content are mixed in the aforementioned range to improve the flowability of the slag.

The mixture comprising nickel sintered ore, boron oxide content, alumina content, and coke may comprise 1 wt% to 25 wt% boron oxide content and alumina content. If the amount of boron oxide content and alumina content is too small, the boron oxide content and alumina content may be reduced in the middle without reaching the bottom of the blast furnace. In this case, melting dripping of slag is hardly performed in a blast furnace, and slag hardly contains boron oxide and alumina. As a result, the fluidity of the slag is greatly lowered, making it difficult to work on the ship. Conversely, if the boron oxide content and the alumina content are too large, the erosion of the blast furnace refractory weight is increased, which shortens the blast furnace life.

The particle size of the mixture in which the boron oxide content and the alumina content are mixed may be 0.2 mm to 20 mm. If the particle size of the mixture is too small, its surface area is so large that boron oxide and alumina do not maintain an oxidation state inside the blast furnace. As a result, boron oxide and alumina can be reduced by reacting with coke. In this case, boron oxide and alumina cannot be incorporated into the slag and thus the flowability of the slag cannot be improved. And when the particle size of the mixture is too large, it is difficult to mix the mixture into the slag.

If fluorite is used in place of boron oxide or alumina, fluorine is contained in the blast furnace flue gas to contaminate the atmosphere, and slag contains fluorine to contaminate the environment. Moreover, slag treatment is not easy.

Next, in step S30, hot air is blown into the blast furnace to produce nickel-containing molten iron and slag. The coke charged into the blast furnace is heated by high temperature while being burned by hot air. Therefore, nickel-containing molten iron and slag are produced while the nickel sintered ore is reduced by the mutual reaction between the coke and the nickel sintered ore.

Finally, in step S40, nickel-containing molten iron and slag are taken out from the blast furnace. That is, nickel-containing molten iron and slag are taken out through the hot water outlet of the blast furnace. In this case, in order to remove the slag from the nickel-containing molten iron, the slag should have good fluidity and low viscosity and melting temperature. As described above, since boron oxide and alumina are used in this embodiment, the boron oxide and alumina are contained in the slag in a large amount to improve the flowability of the slag. As the loading of the mixture increases, the slag melting point is lowered and the slag fluidity is improved. Therefore, slag can be easily removed from nickel-containing molten iron.

In this case, the amount of boron oxide in the slag may be 1wt% to 10wt%. When the amount of boron oxide is too small, it is difficult to separate nickel-containing molten iron because only alumina is increased to ensure sufficient fluidity of slag. Conversely, when the amount of boron oxide is too large, a relatively expensive boron oxide is used in large amounts to increase the production cost, and boron erodes the blast furnace refractory.

On the other hand, the amount of alumina in the slag may be 5wt% to 20wt%. If the amount of alumina is too small, it is difficult to ensure sufficient fluidity of the slag, and it is difficult to separate nickel-containing molten iron. On the contrary, when the amount of alumina is too large, the flowability of molten iron is lowered, and a relatively large amount of aluminum oxide, which is relatively expensive, is used to increase the production cost. In addition, aluminum causes blast furnace refractory erosion. Therefore, the composition range of the mixture is adjusted to the above-mentioned range.

As a result, the melting temperature of slag can be adjusted to 1100 ° C to 1400 ° C. If the slag melting temperature is too low, the fluidity of the slag can be sufficiently secured, but there is a possibility that the inside of the furnace is eroded by using a large amount of boron oxide or alumina. On the contrary, when the slag melting temperature is too high, the fluidity of the slag may decrease. Hereinafter, a process of manufacturing nickel-containing molten iron in a blast furnace will be described in more detail with reference to FIG. 2.

2 schematically shows an internal cross section of the blast furnace 100 for producing nickel-containing molten iron.

Nickel sintered ore, boron oxide containing, alumina containing, and coke are charged through the charging chute 10 located above the blast furnace 100. They are evenly distributed in the blast furnace 100 by forming a layer while charging in the form of a mixture. Therefore, heat exchange is performed well between nickel sintered ore, boron oxide content, alumina content, and coke. The coke is charged into the blast furnace 100 to form the coke filling layer 16.

The hot air is blown into the blast furnace 100 through the tuyere 12. Hot air may be used by mixing coke oven gas (COG). The hot air blown into the blast furnace 100 heats the coke-filled layer 16 to form a raceway 14 in the blast furnace 100. The coke packed layer 16 melts nickel sintered ore while being heated at high temperature to form nickel-containing molten iron. Nickel-containing molten iron flows to the lower side of the blast furnace 100 and is discharged to the outside together with the slag through the hot water outlet 18.

As described above, the boron oxide and alumina contained in the boron oxide content and the alumina content respectively charged into the blast furnace 100 through the charging chute 10 are contained in the slag inside the blast furnace 100. Thus, boron oxide and alumina can reduce the melting point of slag. As a result, the slag in the blast furnace 100 can be melt-melted easily to the lower part of the blast furnace 100. As a result, the flowability of the slag is improved, so that the nickel-containing molten iron can be easily taken out through the tapping hole 18.

On the other hand, as shown in Figure 2, by inserting a lance (121) in the tuyere 12 through the lance 121 mixed fine powder containing boron oxide and alumina from the side of the blast furnace 100 ( 100) may be blown directly into the slag layer inside. Here, the particle size of the boron oxide and alumina may be 0.05mm to 0.2mm. If the particle size of the mixed fine powder is too large, the lance 121 may be blocked. Therefore, it is possible to improve the flowability of the slag by adjusting the particle size of the mixed fine powder in the above-described range. Since the mixed fine powder blown through the lance 121 is directly mixed into the slag, the fluidity can be improved while lowering the melting point of the slag. Therefore, the tapping can be easily performed through the tapping hole 18.

Hereinafter, the present invention will be described in more detail through experimental examples. These experimental examples are only for illustrating the present invention, and the present invention is not limited thereto.

Experimental Example  One

Nickel sintered ore, boron oxide-containing substance, and coke were charged into the blast furnace, and hot air was blown into the blast furnace to prepare nickel-containing molten iron and slag. 300 tons of nickel sintered ore and 100 tons of coke were fixedly charged into the blast furnace, and nickel-containing molten iron was produced by gradually increasing the amount of boron oxide-containing charged into the blast furnace. Is shown in Table 1. The remaining experimental conditions are easily understood by those skilled in the art, and thus detailed descriptions thereof will be omitted.

As can be seen from Experimental Example 1 described above, the real ratio of boron oxide in the slag, that is, the amount of boron oxide contained in the slag in the boron oxide content charged was maintained at 90% to 95%. On the other hand, when the loading amount of the boron oxide-containing content was too small, the melting point drop effect was not large and the slag fluidity was not good. Therefore, it was difficult to ship the slag. On the contrary, when the loading amount of the boron oxide content was too small, the melting point of the slag was greatly lowered, but it was expected that the inside of the furnace would be eroded.

3 shows the slag melting temperature according to the slag content of boron oxide (B ₂ O ₃ ) in a dotted line. As shown in Figure 3, it was found that the melting temperature of the slag is lowered as the content in the slag of the boron oxide increases.

Experimental Example  2

Nickel sintered ore, alumina-containing material and coke were charged into the blast furnace, and hot air was blown into the blast furnace to prepare nickel-containing molten iron and slag. Nickel-containing molten iron was prepared while gradually increasing the amount of alumina-containing material charged in the blast furnace. The melting point of the slag and the amount of alumina contained in the slag were measured and the results are shown in Table 2. The remaining experimental conditions are easily understood by those skilled in the art, and thus detailed descriptions thereof will be omitted.

As can be seen from Experimental Example 2 described above, the real percentage of alumina was maintained at 90% to 98%. On the other hand, when the loading amount of the alumina-containing material is too small, for example, when the amount of the alumina in the slag is 5 wt% or less, the melting point drop effect is not great, the slag fluidity is not good, and the slag is difficult to wire. Conversely, when the loading amount of the alumina-containing material is too large, for example, when the amount of alumina in the slag exceeds 16 wt%, a spinel structure occurs in the slag, and the melting temperature of the slag increases.

Figure 3 shows the slag melting temperature according to the content in the slag of alumina (Al ₂ O ₃ ) in a dashed line. As shown in Figure 3, as the content of the slag of the alumina increases, the melting temperature of the slag is lowered, the melting temperature of the slag was again increased while the content of the alumina exceeds about 16wt%.

Experimental Example  3

The boron oxide content and the alumina content were mixed and charged in the blast furnace, and nickel sintered ore and coke were charged in the blast furnace to prepare nickel-containing molten iron and slag. The amounts of boron oxide and alumina contained in the slag were 5 wt% and 10 wt%, respectively, and the melting temperature of the slag was as low as about 1180 ° C.

Comparative example

For comparison with the experimental examples described above, fluorite, which is a conventional method, was mixed with nickel sintered ore and coke and charged into the blast furnace. Next, hot air was blown into the blast furnace to prepare nickel-containing molten iron and slag. Table 3 shows the results of measuring the melting point of slag and the amount of fluorite contained in the slag. Except for the fluorspar, the experimental conditions are the same as the above-described experimental examples, and thus detailed description thereof will be omitted.

As can be seen from the comparative example described above, it was found that the real rate of fluorspar was 41% to 57%, which was relatively small compared to the real rate of boron oxide of Experimental Example 1 and that of alumina of Experimental Example 2. This means that the amount of fluorspar contained in the slag is smaller than the amount of fluorspar charged in the blast furnace. Therefore, the recovered fluorspar can be expected to be contained or vaporized in nickel-containing molten iron. As a result, when the plate is manufactured using nickel-containing molten iron in a subsequent process, hydrofluoric acid is formed due to the fluorine contained in the plate during water cooling of the plate, so that all peripheral devices can be corroded. In addition, it was expected that the fluorspar vaporizes, causing the dust collector to corrode and cause environmental pollution problems.

Figure 3 shows the slag melting temperature according to the slag content of fluorspar (CaF ₂ ) in a solid line. As shown in Figure 3, it was found that the melting temperature of the slag is lowered as the content in the slag of fluorspar increases.

As shown in Figure 3, boron oxide or fluorspar reduced the melting temperature of the slag in a pattern in approximately the same amount. In addition, when alumina is used instead of fluorite, the fluidity of slag can be reduced substantially the same as when fluorite is charged. Therefore, it was anticipated that nickel-containing molten iron could be easily taken out.

In general, when fluorspar is used, the amount of fluorspar in slag is about 5wt%, so when the amount of boron oxide in slag is 5wt% or alumina is 10wt% to 15wt%, it can be expected to obtain better effects than the conventional one. there was. Moreover, when fluorspar is contained in slag, slag cannot be reused due to environmental pollution problem. On the other hand, boron oxide or alumina has no problem of environmental pollution, so the slag can be reused. Thus fluorspar can be replaced with boron oxide or alumina.

4 summarizes the results obtained from Experimental Examples 1 to 3 and Comparative Examples described above.

4 A and B are 5wt% and 10wt% of the boron oxide in the slag in Experimental Example 1, respectively, and C and D of FIG. 4 are 10wt% and 15wt% in the amount of alumina in the slag in Experimental Example 2, respectively. In Figure 4 E is the amount of boron oxide and alumina 5wt% and 10wt% in Experimental Example 3, respectively, and Figure 4F is the slag of the slag when the amount of fluorspar in the slag is 5wt% in Comparative Example The melting temperature is shown.

As shown in Fig. 4, in the case of A and B, the melting temperatures of the slag were 1280 ° C and 1180 ° C, respectively. And in the case of C and D, melting temperature of slag was 1380 degreeC and 1314 degreeC, respectively. In the case of E, the slag melting temperature was 1180 ° C. On the other hand, in the case of F, the melting temperature of slag was 1293 degreeC. This is shown in Table 4 below.

As can be seen from Table 4, when the boron oxide content and the alumina content are mixed and charged into the blast furnace, the melting temperature of the slag can be significantly lowered compared to the case of using only the alumina content or fluorite. . In addition, since the boron oxide-containing content can be charged less than the case where only the boron oxide-containing material is used, manufacturing cost can be greatly reduced, so that nickel-containing molten iron can be manufactured at low cost.

Although the present invention has been described above, it will be readily understood by those skilled in the art that various modifications and variations are possible without departing from the spirit and scope of the claims set out below.

1 is a flow chart schematically showing a method for manufacturing nickel-containing molten iron according to an embodiment of the present invention.

2 is a diagram schematically showing an internal cross section of a blast furnace for producing nickel-containing molten iron.

3 is a graph showing the slag melting temperature according to the content in the slag of boron oxide, alumina or fluorspar.

4 is a graph showing the melting temperature of the slag of Experimental Example 1 to Experimental Example 3 and Comparative Example.

Claims (10)

Sintering nickel oxide ore to provide nickel sintered ore, Charging the mixture containing the nickel sintered ore, boron oxide content, alumina content, and coke to the blast furnace, Blowing hot air into the blast furnace to produce nickel-containing molten iron and slag, and Step out the nickel-containing molten iron and slag from the blast furnace Method for producing nickel-containing molten iron comprising a. The method of claim 1, In the step of charging the mixture into the blast furnace, the boron oxide content and the alumina content is 1wt% to 25wt% of the mixture of the manufacturing method of the nickel-containing molten iron. The method of claim 1, In the step of charging the mixture into the blast furnace, a mixture of the boron oxide content and the alumina content is charged into the blast furnace, wherein the weight ratio of the boron oxide content and the alumina content in the mixture is 20:80 to 80 : Production method of nickel-containing molten iron which is 20 The method of claim 1, In the step of charging the mixture into the blast furnace, the boron oxide content comprises B ₂ O ₃ and the alumina content comprises Al ₂ O _{3 A} method for producing nickel-containing molten iron. The method of claim 1, In the step of drawing out the nickel-containing molten iron and slag, the amount of boron oxide in the slag is 1wt% to 10wt%, the amount of the alumina is 5wt% to 20wt% manufacturing method of nickel-containing molten iron. The method of claim 5, Melting temperature of the slag is 1100 ℃ to 1400 ℃ manufacturing method of molten iron containing nickel. The method of claim 1, The method for producing nickel-containing molten iron further comprising the step of blowing the mixed fine powder containing boron oxide and alumina into the blast furnace through the side of the blast furnace. The method of claim 7, wherein The particle size of the boron oxide and alumina is 0.05mm to 0.2mm manufacturing method of nickel-containing molten iron. The method of claim 1, In the step of charging the mixture into the blast furnace, the boron oxide contained in the boron oxide content is 5wt% to 100%, the alumina contained in the alumina-containing material is 20wt% to 100% method for producing nickel-containing molten iron. The method of claim 1, In the step of charging the mixture into the blast furnace, a mixture of the boron oxide content and the alumina content is charged to the blast furnace, the particle size of the mixture is 0.2mm to 20mm manufacturing method of molten iron containing nickel.

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