KR101322898B1 - Method for manufacturing molten irons comprising nickels - 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 the following steps: i) sintering nickel oxide ore to provide nickel sintered ore, ii) charging a mixture comprising nickel sintered ore, aluminum oxide containing ore, and coke to the blast furnace, iii) hot air into the blast furnace Preparing a nickel-containing molten iron and slag by blowing the same; and iv) drawing out the nickel-containing molten iron and slag from the blast furnace.

Nickel-containing molten iron, aluminum oxide, fluorite, slag, fluidity

Description

Process for producing nickel-containing molten iron {METHOD FOR MANUFACTURING MOLTEN IRONS COMPRISING NICKELS}

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 a change in the melting point of the slag according to the slag content of aluminum oxide or fluorspar.

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 contains 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 a nickel sintered ore, ii) charging a mixture comprising nickel sintered ore, aluminum oxide containing ore, and coke in 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.

The aluminum oxide containing ore may be 1 wt% to 25 wt% of the mixture. The aluminum oxide containing ore may comprise Al ₂ O ₃ . In the step of drawing out the nickel-containing molten iron and the slag, the amount of aluminum oxide in the slag may be 2wt% to 16wt%. The melting point of the slag may be 1305 ° C to 1490 ° C.

In the step of charging the mixture into the blast furnace, aluminum oxide containing ore may contain 5 wt% or more and less than 100 wt%. In the step of charging the mixture into the blast furnace, the particle size of the aluminum-containing ore may be 1 mm to 20 mm.

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 a nickel-containing molten iron according to an embodiment of the present invention, the step of providing a nickel sintered ore (S10), charging a mixture containing nickel sintered ore, aluminum oxide-containing ore, and coke (S20), Blowing hot air into the blast furnace to produce nickel-containing molten iron and slag (S30), and stepping out the nickel-containing molten iron and slag (S40). In addition, other steps may be further included as necessary.

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 may be large. Therefore, after classifying nickel oxide ore into fine nickel or granulated nickel ore, the granulated nickel ore is pulverized 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 mentioned above, coke powder etc. can be mixed together as a raw material for sintering for sintering the nickel oxide ore which equalized the magnitude | size by classifying and regrinding. In this case, the nickel oxide ore is mixed with the coke powder, charged into a kneader or the like and rotated to evenly mix the nickel oxide ore and the coke powder to prepare a sintering mixture. 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, aluminum oxide containing ore and coke. The coke is mixed evenly with the nickel sintered ore and charged in the blast furnace to reduce the nickel sintered ore.

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 aluminum oxide-containing ore into the blast furnace as a solvent, it is possible to improve the melt dropping ability of the slag in the blast furnace, and improve the fluidity of the slag. Moreover, the viscosity of slag can be reduced. This makes it easier to work on the ship. And because it uses an aluminum oxide-containing ore, unlike fluorspar can proceed smoothly to the subsequent process, there is no environmental pollution problem. By using aluminum oxide-containing ore as a substitute for fluorspar, slag produced in the blast furnace can be easily removed.

As an aluminum oxide containing ore, bauxite ore or ladle slag may be used. The aluminum oxide-containing ore contains 5 wt% or more but less than 100% aluminum oxide. When aluminum oxide containing ore contains less than 5wt% aluminum oxide, the amount of aluminum oxide is too small to improve the flowability of slag. Aluminum oxide-containing ore comprises an Al ₂ O ₃ mainly, Al ₂ O ₃ is added dropwise to help keep blast furnace slag is melted well in the blast furnace to the lower. In addition, almost all of Al ₂ O ₃ is contained in the slag to reduce the melting point of the slag and increase the flowability of the slag. In particular, since the melting point of Al ₂ O ₃ is high and does not reduce well, it can be incorporated into the slag while maintaining the oxidation state as it is.

On the other hand, in the case of using fluorspar, fluorine is contained in the blast furnace flue gas to contaminate the air, and fluorine is contained in the slag to contaminate the environment. Moreover, slag treatment is not easy.

The particle size of the aluminum oxide containing ore may be 0.05 mm to 0.2 mm. If the particle size of the aluminum oxide-containing ore is too small, the surface area of the aluminum oxide is so large that the aluminum oxide in the blast furnace can not be maintained in an oxidation state and can react with coke and be reduced. In this case, aluminum oxide cannot be mixed into the slag, and thus the flowability of the slag cannot be improved. In addition, when the particle size of the aluminum oxide-containing ore is too large, it may be difficult for aluminum oxide to be incorporated into the slag. Therefore, the flowability of slag cannot be improved.

The aluminum oxide containing ore may be included in the mixture described above in an amount of 1 wt% to 25 wt%. If the amount of the aluminum oxide-containing ore is too small, the aluminum oxide may not reach the bottom of the blast furnace and may be reduced in the middle. In this case, the molten dripping of the slag is not well done in the blast furnace, it may be difficult to go out because the slag contains little aluminum oxide. Conversely, when the amount of the aluminum oxide-containing ore is too large, the erosion of the blast furnace refractory weight is increased to shorten the blast furnace life.

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 that is the residue from the nickel-containing molten iron, the flowability of the slag should be good and the viscosity and melting point should be low. As described above, since the aluminum oxide-containing ore is used in the present embodiment, the aluminum oxide is contained in the slag in a large amount to improve the flowability of the slag. As the loading amount of the aluminum oxide-containing ore increases, the slag melting point is lowered, thereby improving the flowability of the slag. Therefore, slag can be easily removed from nickel-containing molten iron.

In this case, the amount of aluminum oxide contained in the slag may be 2wt% to 40wt%. If the amount of aluminum oxide is too small, the fluidity of the slag cannot be sufficiently secured, so that separation of nickel-containing molten iron is difficult. Conversely, when the amount of aluminum oxide is too large, a relatively expensive large amount of aluminum oxide is used to increase the production cost, and aluminum causes blast furnace refractory erosion. Therefore, the amount of aluminum oxide is adjusted in the above-described range. 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, aluminum oxide containing ore and coke are charged through the charging chute 10 located above the blast furnace 100. Nickel sintered ore, aluminum oxide-containing ore and coke are evenly distributed in the blast furnace 100 while forming a layer as it is charged. Therefore, the heat exchange between nickel sintered ore, aluminum oxide ore and coke is performed well. 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 aluminum oxide contained in the aluminum oxide-containing ore charged into the blast furnace 100 through the charging chute 10 is contained in a large amount in the slag inside the blast furnace 100. Therefore, since the aluminum oxide can reduce the melting point of the slag, the slag inside the blast furnace 100 can be easily melted down to the lower portion of the blast furnace 100. As a result, the fluidity of the slag is improved, so that nickel-containing molten iron can be easily wired out through the tapping hole 18.

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

Experimental Example

Nickel sintered ore, aluminum oxide containing ore, and coke were charged to 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 charged into the blast furnace, and nickel-containing molten iron was manufactured while gradually increasing the amount of the aluminum oxide-containing ore charged into the blast furnace, and the melting point of the slag and the amount of aluminum oxide contained in the slag. Was measured. The remaining experimental conditions are easily understood by those skilled in the art, and thus detailed descriptions thereof will be omitted.

Experimental Example  One

Nickel-containing molten iron was prepared by charging 17 kg of aluminum oxide-containing ore into the blast furnace. A slag of 31.2 tons was obtained, and the amount of aluminum oxide in the slag was 15.6 kg. The melting point of the slag was 1490 ° C.

Experimental Example  2

Nickel-containing molten iron was prepared by charging 710 kg of aluminum oxide-containing ore into the blast furnace. A slag of 32.1 tons was obtained, and the amount of aluminum oxide in the slag was 642 kg. The melting point of the slag was 1488 ° C.

Experimental Example  3

Nickel-containing molten iron was prepared by charging 1.44 tons of aluminum oxide-containing ore into the blast furnace. Slag of 32.5 tons was obtained, and the amount of aluminum oxide in the slag was 1.3 tons. The melting point of the slag was 1470 ° C.

Experimental Example  4

2.19 tons of aluminum oxide-containing ore was charged to the blast furnace to prepare nickel-containing molten iron. 32.9 tons of slag was obtained, and the amount of aluminum oxide in the slag was 1.974 tons. The melting point of the slag was 1440 ° C.

Experimental Example  5

2.95 tons of aluminum oxide-containing ore was charged to the blast furnace to prepare nickel-containing molten iron. 32.9 tons of slag was obtained, and the amount of aluminum oxide in the slag was 2.656 tons. The melting point of the slag was 1415 ° C.

Experimental Example  6

3.35 tons of aluminum oxide-containing ore was charged to the blast furnace to prepare nickel-containing molten iron. Slag of 33.5 tons was obtained, and the amount of aluminum oxide in the slag was 3.015 tons. The melting point of the slag was 1390 ° C.

Experimental Example  7

4.14 tons of aluminum oxide-containing ore was charged to the blast furnace to prepare nickel-containing molten iron. A slag of 33.9 tons was obtained, and the amount of aluminum oxide in the slag was 3.729 tons. The melting point of the slag was 1365 ° C.

Experimental Example  8

4.92 tons of aluminum oxide-containing ore was charged to the blast furnace to prepare nickel-containing molten iron. Slag of 34.1 tons was obtained, and the amount of aluminum oxide in the slag was 4.433 tons. The melting point of the slag was 1343 ° C.

Experimental Example  9

5.36 tons of aluminum oxide-containing ore was charged to the blast furnace to prepare nickel-containing molten iron. A slag of 34.5 tons was obtained, and the amount of aluminum oxide in the slag was 4.83 tons. The melting point of the slag was 1323 ° C.

Experimental Example  10

6.18 tons of aluminum oxide-containing ore was charged to the blast furnace to prepare nickel-containing molten iron. Slag of 34.8 tons was obtained, and the amount of aluminum oxide in the slag was 15.568 tons. The melting point of the slag was 1305 ° C.

Experimental Example  11

6.63 tons of aluminum oxide-containing ore was charged to the blast furnace to prepare nickel-containing molten iron. Slag of 35.1 tons was obtained, and the amount of aluminum oxide in the slag was 5.967 tons. The melting point of the slag was 1323 ° C.

The experimental conditions and the results of Experimental Example 1 to Example 11 described above are collectively shown in Table 1 below.

In Experimental Examples 1 to 11, the amount of aluminum oxide in the slag was measured by weight and wt%. The amount of aluminum oxide in the slag was compared with the amount of aluminum oxide charged to determine the real percentage of aluminum oxide, that is, how much of the charged aluminum oxide-containing ore remained in the slag. In addition, the melting point of the slag prepared according to Experimental Example 1 to Experimental Example 11 was measured.

As can be seen from the above Experimental Examples 1 to 11, the real rate of aluminum oxide in the slag, that is, the amount of aluminum oxide contained in the slag in the loaded aluminum oxide-containing ore was maintained at 90% to 98%. However, when the loading amount of the aluminum oxide-containing ore was too small as in Experimental Example 1, or when the loading amount of the aluminum oxide-containing ore was too large as in Experimental Example 11, the real percentage of aluminum oxide dropped to 90%.

On the other hand, in Experimental Examples 1 to 10, the slag melting point gradually decreased as the amount of the aluminum oxide-containing ore increased. That is, in Experimental Example 1, the slag melting point was 1490 ° C, but in Experimental Example 10, the slag melting point was lowered to 1305 ° C. However, in Experimental Example 11, the slag melting point was raised to 1323 ℃ again. Therefore, as the amount of aluminum oxide contained in the slag was increased to 16 wt%, the slag melting point gradually decreased as more aluminum oxide-containing ores were charged.

Comparative Example

Instead of the aluminum oxide-containing ore, fluorspar was mixed with nickel sintered ore and coke and charged into the blast furnace for comparison with the above experimental example. Next, hot air was blown into the blast furnace to prepare nickel-containing molten iron and slag. Except for the fluorspar, the experimental conditions are the same as in the above-described experimental example, and thus the detailed description thereof is omitted.

Comparative Example  One

Nickel-containing molten iron was prepared by charging 42.8 kg of fluorspar into the blast furnace. 35.1 tons of slag was obtained, and the amount of fluorspar in the slag was 17.6 kg. The melting point of the slag was 1425 ° C.

Comparative Example  2

Nickel-containing molten iron was prepared by charging 84.5 kg of fluorspar into the blast furnace. Slag of 35.5 tons was obtained, and the amount of fluorspar in the slag was 35.5 kg. The melting point of the slag was 1410 ° C.

Comparative Example  3

Nickel-containing molten iron was prepared by charging 127.9 kg of fluorspar into the blast furnace. Slag of 35.8 tons was obtained, and the amount of fluorspar in the slag was 53.7 kg. The melting point of the slag was 1390 ° C.

Comparative Example  4

Nickel-containing molten iron was prepared by charging 164.1 kg of fluorspar into the blast furnace. 36.1ton of slag was obtained, and the amount of fluorspar in the slag was 72.2kg. The melting point of the slag was 1375 ° C.

Comparative Example  5

Nickel-containing molten iron was prepared by charging 193.6 kg of fluorspar into the blast furnace. A slag of 36.4 tons was obtained, and the amount of fluorspar in the slag was 91 kg. The melting point of the slag was 1358 ° C.

Comparative Example  6

Nickel-containing molten iron was prepared by charging 240 kg of fluorspar into the blast furnace. Slag of 36.8 tons was obtained, and the amount of fluorspar in the slag was 110.4 kg. The melting point of the slag was 1340 ° C.

Comparative Example  7

Nickel-containing molten iron was prepared by charging 260.4 kg of fluorspar into the blast furnace. A slag of 37.2 tons was obtained, and the amount of fluorspar in the slag was 130.2 kg. The melting point of the slag was 1328 ° C.

Comparative Example  8

Nickel-containing molten iron was prepared by charging 289.2 kg of fluorspar into the blast furnace. 37.6 tons of slag was obtained, and the amount of fluorspar in the slag was 150.4 kg. The melting point of the slag was 1317 ° C.

Comparative Example  9

Nickel-containing molten iron was prepared by charging 321.8 kg of fluorspar into the blast furnace. A slag of 37.9 tons was obtained, and the amount of fluorspar in the slag was 170.6 kg. The melting point of the slag was 1305 ° C.

Comparative Example  10

Nickel-containing molten iron was prepared by charging 353.7 kg of fluorspar into the blast furnace. A slag of 38.2 tons was obtained, and the amount of fluorspar in the slag was 191 kg. The melting point of the slag was 1290 ° C.

Comparative Example  11

Nickel-containing molten iron was prepared by charging 393.1 kg of fluorspar into the blast furnace. A slag of 38.6 tons was obtained, and the amount of fluorspar in the slag was 212.3 kg. The melting point of the slag was 1277 ° C.

Comparative Example  12

Nickel-containing molten iron was prepared by charging 424.4 kg of fluorspar into the blast furnace. Slag of 38.9 tons was obtained, and the amount of fluorspar in the slag was 233.4 kg. The melting point of the slag was 1265 ° C.

Comparative Example  13

Nickel-containing molten iron was prepared by charging 475.1 kg of fluorspar into the blast furnace. 40.2 tons of slag was obtained, and the amount of fluorspar in the slag was 261.3 kg. The melting point of the slag was 1255 ° C.

Comparative Example  14

506.3 kg of fluorspar was charged to the blast furnace to prepare nickel-containing molten iron. 40.5 tons of slag was obtained, and the amount of fluorspar in the slag was 283.5 kg. The melting point of the slag was 1245 ° C.

Comparative Example  15

Nickel-containing molten iron was prepared by charging 545.1 kg of fluorspar into the blast furnace. A slag of 40.7 tons was obtained, and the amount of fluorspar in the slag was 305.3 kg. The melting point of the slag was 1235 ° C.

Comparative Example  16

Nickel-containing molten iron was prepared by charging 574 kg of fluorspar into the blast furnace. 40.9tons of slag was obtained, and the amount of fluorspar in the slag was 327.2 kg. The melting point of the slag was 1225 ° C.

The experimental conditions and the results of the aforementioned Comparative Example 1 to Comparative Example 16 are collectively shown in Table 2 below.

In Comparative Examples 1 to 16, the amount of fluorspar in the slag was measured by weight and wt%. The amount of fluorspar in the slag was compared with the amount of fluorspar charged to determine the real rate of fluorspar, ie, how much of the charged fluorspar remains in the slag. In addition, the melting point of the slag prepared according to Comparative Example 1 to Comparative Example 16 was measured.

As can be seen from Comparative Examples 1 to 16 described above, it can be seen that the real ratio of fluorite is 41% to 57%, which is relatively small compared to aluminum oxide. In other words, the amount of fluorspar contained in the slag was less than the amount of fluorspar charged in the blast furnace. Therefore, the remaining fluorspar can be expected to be contained or vaporized in the nickel-containing molten iron. As a result, hydrofluoric acid is formed due to the fluorine contained in the plate during the water cooling of the plate when the plate is manufactured using nickel-containing molten iron in a subsequent process, so that all the peripheral devices can be corroded, and the dust collector can be corroded. It can also cause environmental pollution.

3 is a graph showing a change in the melting point of the slag according to the slag content of the above-described aluminum oxide or fluorspar. Experimental examples 1 to 11 described above in FIG. 3 correspond to the case where aluminum oxide is added, and comparative examples 1 to 16 correspond to the case where fluorite is added.

As shown in Figure 3, when using aluminum oxide or fluorite, it can be seen that the melting temperature of the slag decreases almost similarly as the content in the slag increases. That is, by using only slightly more aluminum oxide instead of fluorite, the flowability of slag can be reduced to almost the same level, so that the nickel-containing molten iron can be easily taken out. Moreover, when fluorite is contained in slag, it is impossible to recycle slag due to environmental pollution problem, but aluminum oxide has no environmental pollution problem, so slag can be reused. Therefore, fluorite can be replaced with aluminum oxide.

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

It will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the following claims.

Claims (7)

Sintering nickel oxide ore to provide nickel sintered ore, Charging the mixture containing the nickel sintered ore, aluminum oxide containing ore, 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, The aluminum oxide-containing ore is a method for producing nickel-containing molten iron is 1wt% to 25wt% of the mixture. The method of claim 1, Method of producing a nickel-containing molten iron to the aluminum oxide-containing ores including Al ₂ O _3. The method of claim 1, In the step of drawing out the nickel-containing molten iron and slag, the amount of aluminum oxide in the slag is 2wt% to 16wt% manufacturing method of nickel-containing molten iron. 5. The method of claim 4, Melting point of the slag is 1305 ℃ to 1490 ℃ manufacturing method of nickel-containing molten iron. The method of claim 1, In the step of charging the mixture into the blast furnace, a method for producing nickel-containing molten iron containing at least 5wt% aluminum oxide in the aluminum oxide-containing ore. The method of claim 1, In the step of charging the mixture into the blast furnace, the particle size of the aluminum-containing ore is 1mm to 20mm manufacturing method of nickel-containing molten iron.

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