Nickel-containing compound as well as preparation method and application thereof

Abstract

The invention discloses a nickel-containing compound and a preparation method and application thereof. The nickel-containing compound comprises the following raw materials: iron ore powder, wherein the total iron content in the iron ore powder is greater than or equal to 50wt%; the content of nickel oxide in the nickel oxide mineral powder is greater than or equal to 10wt.%; a reducing agent; a binder; the content of copper, chromium and cobalt metal oxides in the nickel-containing compound is less than or equal to 0.5 wt.%. According to the nickel-containing compound disclosed by the embodiment of the invention, the iron ore powder, the nickel oxide ore powder, the reducing agent and the binder are mixed and prepared into the blocky nickel-containing compound, the nickel content in the nickel-containing compound is stable, the components are uniform, the granularity is uniform, the nickel-containing compound is used for smelting nickel-containing steel, the nickel yield fluctuation can be small, and the nickel yield is high. And the nickel content in the molten steel can be conveniently and effectively controlled in a smelting field, so that the production process is stable. And the use of expensive nickel plates, nickel-containing pig iron and other materials is reduced, and the smelting cost of the nickel-containing steel is remarkably reduced.

Description

Technical Field

[0001] This application belongs to the field of iron and steel smelting technology, and in particular relates to a nickel-containing composite material, its preparation method and application. Background Technology

[0002] Adding nickel to molten steel can refine ferrite grains, improving the steel's strength, toughness, and corrosion resistance, while also enhancing its high-temperature resistance. It is widely used in weathering steel, high-temperature welding wire, and stainless steel. Currently, in the smelting of nickel-containing steel, nickel plates or nickel-containing pig iron are typically added as alloying materials to increase the nickel content in the molten steel. This method offers a high and stable nickel recovery rate and is simple to operate. However, due to the scarcity of nickel resources, the complexity of the production process, and the high prices of materials such as nickel plates and nickel-containing pig iron, with no other substitutes, the production cost of nickel-containing steel is high. Summary of the Invention

[0003] This application provides a nickel-containing composite material, which, when used in the smelting of nickel-containing steel, can reduce the fluctuation of nickel yield, facilitate effective control of nickel content in molten steel on-site, stabilize the production process, and significantly reduce the smelting cost of nickel-containing steel.

[0004] In a first aspect, this application provides a nickel-containing composite material comprising the following raw materials: iron ore powder, wherein the total iron content in the iron ore powder is ≥50wt.%, SiO2≤9wt.%, and Al2O3≤3wt.%; nickel oxide ore powder, wherein the nickel oxide content in the nickel oxide ore powder is ≥10wt.%; a reducing agent and a binder; and the content of copper, chromium, and cobalt metal oxides in the nickel-containing composite material is ≤0.5wt.%.

[0005] According to the embodiments of the first aspect of this application, the total iron content in the iron ore powder is 50 wt.% to 70 wt.%.

[0006] According to an embodiment of the first aspect of this application, the iron ore powder is selected from one or more combinations of hematite, magnetite, and limonite.

[0007] According to the embodiments of the first aspect of this application, the nickel oxide content in the nickel oxide ore powder is 10 wt.% to 50 wt.%.

[0008] According to the embodiments of the first aspect of this application, the average particle size of both iron ore powder and nickel oxide ore powder is ≤5mm.

[0009] According to an embodiment of the first aspect of this application, the mass ratio of iron ore powder to nickel oxide ore powder satisfies 1:(1-4).

[0010] According to an embodiment of the first aspect of this application, a mixture of iron ore powder and nickel oxide ore powder is mixed with a reducing agent at a mass ratio of (1-4):1.

[0011] According to an embodiment of the first aspect of this application, the mixture of iron ore powder and nickel oxide ore powder after reaction is mixed with a binder at a mass ratio of (2-8):1.

[0012] According to an embodiment of the first aspect of this application, the reducing agent includes one or a mixture of two or more of the following: charcoal powder, graphite powder, coke, and straw.

[0013] According to an embodiment of the first aspect of this application, the average particle size of the reducing agent is 0.5 mm to 1 mm.

[0014] According to an embodiment of the first aspect of this application, the adhesive includes one or a mixture of two or more organic adhesives and inorganic adhesives.

[0015] According to an embodiment of the first aspect of this application, the inorganic binder includes one or both of bentonite and slaked lime.

[0016] According to an embodiment of the first aspect of this application, the organic binder includes one or both of peridot and modified starch.

[0017] According to an embodiment of the first aspect of this application, the particle size of the nickel-containing composite is 20 mm to 30 mm.

[0018] Secondly, this application provides a method for preparing a nickel-containing composite, comprising: pulverizing iron ore and nickel oxide ore to obtain a mixed powder of iron ore and nickel oxide ore; adding a reducing agent to the mixed powder of iron ore and nickel oxide ore and subjecting it to heating and dispersion treatment to obtain a blended powder; or, mixing iron ore, nickel oxide ore and a reducing agent and subjecting them to crushing, dispersion and heating treatment to obtain a blended powder; and mixing the blended powder with a binder and subjecting it to molding treatment to obtain a nickel-containing composite product.

[0019] According to an embodiment of the second aspect of this application, in the step of crushing iron ore and nickel oxide ore, the average particle size of the iron ore and nickel oxide ore after crushing is ≤5mm.

[0020] According to an embodiment of the second aspect of this application, the step of adding a reducing agent to a mixed powder of iron ore and nickel oxide for dispersion and heating treatment includes: dispersing the mixed powder of iron ore and nickel oxide with a reducing agent at a mass ratio of (1-4):1.

[0021] According to an embodiment of the second aspect of this application, the step of adding a reducing agent to a mixed powder of iron ore and nickel oxide ore for dispersion and heating treatment includes: stirring the mixed powder of iron ore and nickel oxide ore with the reducing agent at 450°C to 550°C for 30 to 60 minutes.

[0022] According to an embodiment of the second aspect of this application, mixing the blended powder with a binder and then molding it includes: mixing the blended powder with the binder and pressing it into a block shape using a molding machine to obtain a nickel-containing composite product in a block shape.

[0023] According to an embodiment of the second aspect of this application, the nickel-containing composite is in the form of pellets.

[0024] Thirdly, this application provides the application of the nickel-containing composite of the first aspect in the smelting of nickel-containing steel.

[0025] According to an embodiment of the third aspect of this application, the application of the nickel-containing compound in the smelting of nickel-containing steel includes: adding the nickel-containing compound to molten steel tapped from a converter or molten steel undergoing LF refining, and obtaining nickel-containing steel through smelting treatment.

[0026] The nickel-containing composite material, its preparation method, and its application in this application involve mixing iron ore powder, nickel oxide ore powder, a reducing agent, and a binder to form a lumpy nickel-containing composite material. This composite material exhibits stable nickel content, uniform composition, and consistent particle size. When used in the smelting of nickel-containing steel, it minimizes fluctuations in nickel yield, facilitating effective control of the nickel content in the molten steel during the smelting process and ensuring stability. Furthermore, it reduces the use of expensive materials such as nickel plates and nickel-containing pig iron, significantly lowering the cost of nickel smelting. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be briefly introduced below. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic flowchart illustrating the preparation method of the nickel-containing composite provided in this application embodiment.

[0029] Figure 2 This is a physical image of the nickel-containing composite provided in Example 1 of this application.

[0030] Figure 3 This is a physical image of the nickel-containing composite provided in Example 3 of this application.

[0031] Figure 4 This is a physical image of the nickel-containing composite provided in Example 4 of this application.

[0032] Figure 5 This is a physical image of the nickel-containing composite provided in Example 5 of this application. Detailed Implementation

[0033] The features and exemplary embodiments of various aspects of this application will be described in detail below. To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain this application and not to limit it. For those skilled in the art, this application can be implemented without some of these specific details. The following description of the embodiments is merely to provide a better understanding of this application by illustrating examples.

[0034] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes said element.

[0035] To address the problems of the prior art, this application provides a nickel-containing composite, its preparation method, and its application. The nickel-containing composite provided in this application is described below.

[0036] In a first aspect, embodiments of this application provide a nickel-containing composite material, comprising: iron ore powder, wherein the total iron content in the iron ore powder is ≥50 wt.%, SiO2 ≤9 wt.%, and Al2O3 ≤3 wt.%; nickel oxide ore powder, wherein the nickel oxide content in the nickel oxide ore powder is ≥10 wt.%; a reducing agent; and a binder; wherein the content of copper, chromium, and cobalt metal oxides in the nickel-containing composite material is ≤0.5 wt.%.

[0037] The nickel-containing composite material of this application embodiment is prepared by mixing iron ore powder, nickel oxide ore powder, reducing agent, and binder to form a lumpy nickel-containing composite material. The nickel content in the nickel-containing composite material is stable, the composition is uniform, and the particle size is uniform. When used in the smelting of nickel-containing steel, it can reduce the fluctuation of nickel yield, facilitate effective control of the nickel content in the molten steel on the smelting site, and stabilize the production process. It also reduces the use of expensive materials such as nickel plates and nickel-containing pig iron, significantly reducing the smelting cost of nickel-containing steel.

[0038] In some embodiments, the total iron content in the iron ore powder is 50 wt.% to 70 wt.%.

[0039] In some embodiments, the nickel oxide content in the nickel oxide ore powder is 10 wt.% to 50 wt.%. Iron ore powder and nickel oxide ore powder meeting the above content can be used to prepare a nickel-containing composite.

[0040] In some embodiments, the average particle size of both iron ore powder and nickel oxide powder is ≤5mm. The larger the particle size of iron ore powder and nickel oxide powder, the slower the reduction reaction rate, and the more likely the ore powder will not react completely, resulting in the ineffective utilization of the required elements, leading to an increase in the amount of nickel-containing complex used, and thus waste.

[0041] In some embodiments, the mass ratio of iron ore powder to nickel oxide powder satisfies 1:(1-4). Using this ratio, the nickel-containing composite can contain primarily nickel oxide, thus effectively increasing its nickel content when added to molten iron or steel. Exemplarily, the mass ratio of iron ore powder to nickel oxide powder satisfies 1:1, 1:1.1, 1:1.3, 1:1.5, 1:1.8, 1:2.0, 1:2.1, 1:2.3, 1:2.5, 1:2.7, 1:2.9, 1:3.0, 1:3.1, 1:3.2, 1:3.3, 1:3.5, 1:3.7, 1:3.8, and 1:4.

[0042] In some embodiments, the mixture of iron ore and nickel oxide ore is mixed with a reducing agent at a mass ratio of (1-4):1. Exemplarily, the reducing agent is mixed with the mixture of iron ore and nickel oxide ore at mass ratios of 1:1, 1:1.25, 1:1.5, 1:1.8, 1:2, 1:2.4, 1:1.25, 1:1.27, 1:1.28, 1:3, 1:1.32, 1:1.35, 1:1.38, and 1:4. Mixing the mixture of iron ore and nickel oxide ore with the reducing agent at the above mass ratios can sufficiently reduce the iron ore and nickel oxide ore powder.

[0043] In some embodiments, the mixture of iron ore powder and nickel oxide ore powder after reaction is mixed with the binder at a mass ratio of (2-8):1. For example, the mixture of iron ore powder and nickel oxide ore powder after reaction with the binder can be mixed with a mass ratio of 2:1, 2:1.5, 2:1.8, 2:2.1, 2:2.3, 2:2.5, 2:2.7, 2:2.9, 2:3, 2:3.1, 2:3.2, 2:3.4, 2:3.5, 2:3.6, 2:3.8, 2:4.0, 2:4.2, 2:4.5, 2:4.7, 2:4.9, 2:5.0, 2:5.3, 2:5.5, 2:5.7, 2:5.9, 2:6.0, 2:6.2, 2:6.4, 2:6.6, 2:6.7, 2:6.8, 2:7.0, 2:7.2, 2:7.5, 2:7.6, 2:7.8, 2:7.9, or 2:8.

[0044] In some embodiments, the reducing agent includes one or a mixture of two or more of carbon powder, graphite powder, coke, and straw. These reducing agents have strong reducing properties, are lightweight, and are inexpensive, which helps to reduce the smelting cost of nickel-containing steel.

[0045] In some embodiments, the average particle size of the reducing agent is 0.5 mm to 1 mm. For example, the average particle size of the reducing agent is 0.6 mm, 0.64 mm, 0.7 mm, 0.75 mm, 0.8 mm, 0.9 mm, or 1 mm.

[0046] In some embodiments, the adhesive comprises one or a mixture of two or more of organic and inorganic adhesives. It is understood that the adhesive may also be a mixture of organic and inorganic adhesives.

[0047] In some embodiments, the inorganic binder includes one or both of bentonite and hydrated lime.

[0048] In some embodiments, the organic binder includes one or both of peridot and modified starch.

[0049] In some embodiments, the average particle size of the nickel-containing composite is 20 mm to 30 mm. Exemplarily, the particle size of the nickel-containing composite is 20 mm, 22 mm, 23 mm, 24 mm, 25 mm, 27 mm, 28 mm, 30 mm, or any value between 20 mm and 30 mm, or a combination of two or more particle sizes. Using the above-mentioned average particle size of the nickel-containing composite allows it to be effectively dispersed in the molten iron or steel during the process of being added to and descending the molten iron or steel. This avoids the situation where an excessively small average particle size would cause it to dissolve in the upper part of the molten iron or steel during the descent process, resulting in uneven nickel content distribution in the molten iron or steel. It also prevents the nickel-containing composite from being unable to dissolve in the molten iron or steel within an effective time, leading to an increase in the amount of nickel-containing composite required and making it difficult to effectively control the nickel content of the molten iron or steel to the desired target.

[0050] Figure 1 A schematic flowchart of a method for preparing a nickel-containing composite according to an embodiment of this application is shown.

[0051] Secondly, such as Figure 1 As shown in the embodiments of this application, the method for preparing the nickel-containing composite includes: S1. The iron ore and nickel oxide ore are crushed to obtain a mixed powder of iron ore and nickel oxide ore; S2. Add a reducing agent to the mixed powder of iron ore and nickel oxide ore, disperse and heat it to obtain a blended powder; or, mix iron ore, nickel oxide ore and reducing agent, crush, disperse and heat it to obtain a blended powder. S3. The blended powder is mixed with the binder and then molded to obtain a nickel-containing composite product.

[0052] The method for preparing the nickel-containing composite provided in this application involves splitting iron ore powder and nickel oxide powder into filaments and dispersing them through heating. This allows the iron ore powder and nickel oxide powder to undergo a reduction reaction in the presence of a reducing agent, resulting in a reduced mixture containing metallic iron and nickel. The mixture obtained from the reduction reaction is then mixed with a binder to form a lumpy nickel-containing composite. The nickel-containing composite has a stable nickel content, uniform composition, and consistent particle size. When used in the smelting of nickel-containing steel, it can minimize fluctuations in nickel yield and facilitate effective control of the nickel content in the molten steel on-site, thus ensuring a stable production process.

[0053] The preparation method of the nickel-containing composite provided in this application uses nickel-containing composites containing mainly Cu, As, Zn and Sn as impurity elements. In the process of smelting nickel-containing steel using nickel-containing composites, the amount of nickel-containing composites added is set according to the requirements of impurity elements in nickel-containing steel to prevent the impurity element content from exceeding the standard.

[0054] In some embodiments, in the step of crushing iron ore and nickel oxide ore, the average particle size of the iron ore and nickel oxide ore after crushing is ≤5mm.

[0055] In some embodiments, the step of adding a reducing agent to a mixed powder of iron ore and nickel oxide for dispersion and heating treatment includes: dispersing the mixed powder of iron ore and nickel oxide with a reducing agent at a mass ratio of (1-4):1. The reducing agent can reduce most of the iron oxides and nickel oxides in the mixed powder of iron ore and nickel oxide to the corresponding elemental substances.

[0056] In some embodiments, the steps of adding a reducing agent to a mixed powder of iron ore and nickel oxide ore for dispersion and heat treatment include: The mixed powder of iron ore and nickel oxide ore was stirred and reacted with a reducing agent at 450℃ to 550℃ for 30 to 60 minutes. For example, the mixed powder of iron ore and nickel oxide ore was stirred and reacted with a reducing agent at 450℃, 455℃, 460℃, 468℃, 470℃, 475℃, 480℃, 488℃, 490℃, 496℃, 500℃, 505℃, 510℃, 518℃, 520℃, 530℃, 540℃, and 550℃.

[0057] In some embodiments, mixing the blended powder with a binder and then molding it includes: mixing the blended powder with a binder and pressing it into lumps using a molding machine to obtain lumps of nickel-containing composite.

[0058] For example, the nickel-containing composite can be square, cuboid, rhomboid, prism, regular polyhedron, sphere, ellipsoid, rod, or ball-and-stick. It is understood that the nickel-containing composite can be pressed into pellets, which dissolve more uniformly on the surface of molten iron or steel, allowing for more efficient addition of nickel from the composite to the molten iron or steel.

[0059] Thirdly, this application provides the application of the nickel-containing composite of the first aspect in the smelting of nickel-containing steel.

[0060] In some embodiments, the application of the nickel-containing compound in the smelting of nickel-containing steel includes: adding the nickel-containing compound to molten steel tapped from a converter or molten steel undergoing LF refining, and then smelting to obtain nickel-containing steel.

[0061] The technical solution and technical effects of this application will be further described below through specific embodiments and comparative examples. The following are the requirements for some raw materials or their available sources: Adhesive, JD-106 type composite adhesive.

[0062] The reducing agent is carbon powder or graphite powder.

[0063] Example 1 This embodiment provides a nickel-containing composite 1, comprising: Iron ore, with a total iron content of 55.5 wt.%; CaO, 4.3 wt.%; MgO, 2.5%; SiO2, 6.2 wt.%; Al2O3, 0.6 wt.%. Nickel oxide ore, containing 12.6 wt.% nickel oxide, 0.6 wt.% CuO, and 0.8 wt.% Cr2O3; the mass ratio of iron ore to nickel oxide ore is 1:1. And carbon powder as a reducing agent; Adhesive, JD-106 type composite adhesive; The mass ratio of the mixture of iron ore and nickel oxide ore to the reducing agent is 8:4, and the mass ratio of the mixture of iron ore powder and nickel oxide ore powder after reaction to the binder is 3:1. The content of copper, chromium, and cobalt metal oxides in the nickel-containing composite is <0.5 wt.%.

[0064] Example 2 A method for preparing a nickel-containing composite, used to prepare the nickel-containing composite provided in Example 1, comprising: 200 kg of iron ore and 200 kg of nickel oxide ore were placed in a ball mill for ball milling, crushing and screening to obtain a mixed powder of iron ore and nickel oxide ore with a particle size ≤5 mm. Place 200 kg of ball-milled iron ore powder, 200 kg of nickel oxide ore powder, and 200 kg of carbon powder into a stirrer, turn on the stirrer, and heat the mixture to 500°C at the same time. Stir for 45 minutes to obtain a blended powder. After mixing, the blended powder is added to 50 kg of JD-106 composite binder, pressed into pellets using a briquetting machine, and then dried in a dryer to obtain the following product: Figure 2 The spherical nickel-containing composite 1 shown.

[0065] Example 3 This embodiment provides a method such as Figure 3 The nickel-containing compound 2 shown includes: Iron ore, with a total iron content of 55.5 wt.%; CaO, 4.3 wt.%; MgO, 2.5%; SiO2, 6.2 wt.%; Al2O3, 0.6 wt.%. Nickel oxide ore, containing 12.6 wt.% nickel oxide, 0.6 wt.% CuO, and 0.8 wt.% Cr₂O₃; the mass ratio of iron ore to nickel oxide ore is 1:3. And graphite powder as a reducing agent; The adhesive is JD-106 type composite adhesive; The mass ratio of the mixture of iron ore and nickel oxide ore to the reducing agent is 6:3, and the mass ratio of the mixture of iron ore powder and nickel oxide ore powder after reaction to the binder is 3:1. The content of copper, chromium, and cobalt metal oxides in the nickel-containing composite is <0.5 wt.%.

[0066] The preparation method of the nickel-containing composite in this embodiment is the same as that in Example 2, and will not be repeated here.

[0067] Example 4 This embodiment provides a method such as Figure 4 The nickel-containing composite 3 shown includes: Iron ore, with a total iron content of 55.5 wt.%; CaO, 4.3 wt.%; MgO, 2.5%; SiO2, 6.2 wt.%; Al2O3, 0.6 wt.%. Nickel oxide ore, containing 12.6 wt.% nickel oxide, 0.6 wt.% CuO, and 0.8 wt.% Cr2O3; the mass ratio of iron ore to nickel oxide ore is 1:3. And graphite powder as a reducing agent; The adhesive is JD-106 type composite adhesive; The mass ratio of the mixture of iron ore and nickel oxide ore to the reducing agent is 10:4, and the mass ratio of the mixture of iron ore powder and nickel oxide ore powder after reaction to the binder is 3.5:1. The content of copper, chromium, and cobalt metal oxides in the nickel-containing composite is <0.5 wt.%.

[0068] The preparation method of the nickel-containing composite in this embodiment is the same as that in Example 2, except that the heating temperature is 455°C.

[0069] Example 5 This embodiment provides a method such as Figure 5 The nickel-containing compound 4 shown includes: Iron ore, with a total iron content of 55.5 wt.%; CaO, 4.3 wt.%; MgO, 2.5%; SiO2, 6.2 wt.%; Al2O3, 0.6 wt.%. Nickel oxide ore, containing 12.6 wt.% nickel oxide, 0.6 wt.% CuO, and 0.8 wt.% Cr2O3; the mass ratio of iron ore to nickel oxide ore is 1:3. And graphite powder as a reducing agent; The adhesive is JD-106 type composite adhesive; The mass ratio of the mixture of iron ore and nickel oxide ore to the reducing agent is 12:5, and the mass ratio of the mixture of iron ore powder and nickel oxide ore powder after reaction to the binder is 3.4:1.

[0070] The preparation method of the nickel-containing composite in this embodiment is the same as that in Example 2, except that the heating temperature is 545°C.

[0071] Example 6 This embodiment provides an application of a nickel-containing compound. 160 tons of molten iron and 55 tons of scrap steel are poured into a converter for oxygen smelting. After smelting, slag is blocked from the ladle and the steel is tapped. The molten steel is then transferred to an LF furnace for LF refining. During LF refining, 20 tons of scrap steel, aluminum blocks, and lime are added for slag formation and desulfurization. Then, 900 kg of nickel-containing compound 1 is added to the molten steel for alloying. Argon stirring is used during the addition process. After 5 minutes, a sample is taken for analysis. The nickel content in the molten steel is 0.0433 wt.%, and the nickel recovery rate is 93.4%. Calculations show that the cost per ton of steel to increase nickel content by 0.01 wt.% using the above-mentioned nickel-containing compound is approximately RMB 5.4.

[0072] Example 7 This embodiment provides an application of a nickel-containing compound. 160 tons of molten iron and 55 tons of scrap steel are poured into a converter for oxygen smelting. After smelting, slag is blocked from the ladle and the steel is tapped. The molten steel is then transferred to an LF furnace for LF refining. During the LF refining process, 20 tons of scrap steel, aluminum blocks, and lime are added for slag formation and desulfurization. 1300 kg of nickel-containing compound 2 is then added to the molten steel for alloying. Argon stirring is used during the addition process. After 5 minutes, a sample is taken for analysis. The nickel content in the molten steel is 0.0407 wt.%, and the nickel recovery rate is 93.3%. Calculations show that the cost per ton of steel to increase nickel content by 0.01 wt.% using the above-mentioned nickel-containing compound is approximately RMB 6.04 / ton.

[0073] Example 8 This embodiment provides an application of a nickel-containing compound. 160 tons of molten iron and 55 tons of scrap steel are poured into a converter for oxygen smelting. After smelting, slag is blocked from the ladle and the steel is tapped. The molten steel is then transferred to an LF furnace for LF refining. During the LF refining process, 20 tons of scrap steel, aluminum blocks, and lime are added for slag formation and desulfurization. 900 kg of nickel-containing compound 3 is then added to the molten steel for alloying. Argon stirring is used during the addition process. After 5 minutes, a sample is taken for analysis. The nickel content in the molten steel is 0.0403 wt%, and the nickel recovery rate is 93.8%. Calculations show that the cost per ton of steel to increase nickel content by 0.01 wt.% using the above-mentioned nickel-containing compound is approximately RMB 5.07.

[0074] Example 9 This embodiment provides an application of a nickel-containing compound. 160 tons of molten iron and 55 tons of scrap steel are poured into a converter for oxygen smelting. After smelting, slag is blocked from the ladle and the steel is tapped. The molten steel is then transferred to an LF furnace for LF refining. During LF refining, 20 tons of scrap steel, aluminum blocks, and lime are added for slag formation and desulfurization. 1000 kg of nickel-containing compound 4 is then added to the molten steel for alloying. Argon stirring is used during the addition process. After 5 minutes, a sample is taken for analysis. The nickel content in the molten steel is 0.0421 wt%, and the nickel recovery rate is 93.8%. Calculations show that the cost per ton of steel to increase nickel content by 0.01 wt.% using the above-mentioned nickel-containing compound is approximately RMB 5.61.

[0075] Example 10 This embodiment provides an application of a nickel-containing compound. 150 tons of molten iron and 65 tons of scrap steel are poured into a converter for oxygen smelting. After smelting, slag is blocked from the ladle and the steel is tapped. The molten steel is then transferred to an LF furnace for LF refining. During LF refining, 20 tons of scrap steel, aluminum blocks, and lime are added for slag formation and desulfurization. 900 kg of nickel-containing compound 1 is then added to the molten steel for alloying. Argon stirring is used during the addition process. After 5 minutes, a sample is taken for analysis. The nickel content in the molten steel is 0.0424 wt.%, and the nickel recovery rate is 91.5%. Calculations show that the cost per ton of steel to increase nickel content by 0.01 wt.% using the above-mentioned nickel-containing compound is approximately RMB 5.51.

[0076] Example 11 This embodiment provides an application of a nickel-containing compound. 155 tons of molten iron and 60 tons of scrap steel are poured into a converter for oxygen smelting. After smelting, slag is blocked from the ladle and the steel is tapped. The molten steel is then transferred to an LF furnace for LF refining. During LF refining, 20 tons of scrap steel, aluminum blocks, and lime are added for slag formation and desulfurization. 1400 kg of nickel-containing compound 2 is then added to the molten steel for alloying. Argon stirring is used during the addition process. Samples are taken for analysis after 5 minutes. The nickel content in the molten steel is 0.04361 wt.%, and the nickel recovery rate is 92.8%. Calculations show that the cost per ton of steel to increase nickel content by 0.01 wt.% using the above-mentioned nickel-containing compound is approximately RMB 6.07.

[0077] Comparative Example 1 This comparative example provides a method for smelting nickel-containing steel using ferronickel, with a nickel content of 20 wt.%. The method includes: pouring 160 tons of molten iron and 55 tons of scrap steel into a converter for oxygen blowing and smelting; after smelting, removing slag from the ladle and tapping the steel; transferring the molten steel to an LF furnace for LF refining; during the LF refining process, adding 20 tons of scrap steel, aluminum blocks, and lime for slag formation and desulfurization; adding 500 kg of ferronickel to the molten steel for alloying treatment; stirring with argon during the addition process; and sampling and analysis after 5 minutes. The nickel content in the molten steel was found to be 0.0447 wt.%, with a nickel recovery rate of 94.5%. Calculations show that the cost per ton of steel to increase nickel content by 0.01 wt.% using the above-mentioned ferronickel is approximately RMB 10.48.

[0078] Comparative Example 2 This comparative example provides a method for smelting nickel-containing steel using nickel plates with a nickel content of 99.9 wt.%. The method includes: pouring 160 tons of molten iron and 55 tons of scrap steel into a converter for oxygen blowing and smelting; after smelting, removing slag from the ladle and tapping the steel; transferring the molten steel to an LF furnace for refining; adding 20 tons of scrap steel, aluminum blocks, and lime for slag formation and desulfurization during the refining process; then adding 100 kg of nickel plates to the molten steel for alloying treatment; stirring with argon during the addition process; and sampling and analysis after 5 minutes. The nickel content in the molten steel was found to be 0.0453 wt.%, with a nickel recovery rate of 95.8%. Calculations show that the cost per ton of steel to increase nickel content by 0.01 wt. using the aforementioned nickel plates is approximately RMB 11.49.

[0079] Comparative Example 3 This comparative example provides a nickel-containing composite, comprising: Iron ore, with a total iron content of 55.5 wt.%; CaO, 4.3 wt.%; MgO, 2.5%; SiO2, 6.2 wt.%; Al2O3, 0.6 wt.%. Nickel oxide ore, containing 12.6 wt.% nickel oxide and 0.8 wt.% Cr₂O₃. A blend of iron ore and nickel oxide ore, with a mass ratio of iron ore to nickel oxide ore of 1:5.

[0080] And graphite powder as a reducing agent; The adhesive is JD-106 type composite adhesive; The mass ratio of the mixture of iron ore and nickel oxide ore to the reducing agent is 6:1, and the mass ratio of the mixture of iron ore powder and nickel oxide ore powder after reaction to the binder is 7:1.

[0081] This comparative example also provides a method for smelting nickel-containing steel using a nickel-containing compound, comprising: pouring 160 tons of molten iron and 55 tons of scrap steel into a converter for oxygen blowing smelting; after smelting, removing slag from the ladle and tapping the steel; transferring the molten steel to an LF furnace for refining treatment; during the treatment process, adding 20 tons of scrap steel, along with aluminum blocks and lime for slag formation and desulfurization; then adding 1000 kg of a nickel-containing compound to the molten steel for alloying treatment; argon blowing and stirring during the addition process; and taking samples for analysis after 5 minutes. The nickel content in the molten steel was 0.0429 wt.%, and the nickel recovery rate was only 75.6%. Calculations show that the cost per ton of steel to increase nickel content by 0.01 wt.% using the above-mentioned nickel-containing compound is approximately RMB 8.82.

[0082] Comparing the above Examples 6-11 and Comparative Examples 1-3, it can be concluded that using the nickel-containing composite provided in the embodiments of this application for the smelting of nickel-containing steel can effectively reduce the cost of increasing nickel content by 0.01 wt% per ton of nickel-containing steel by 47.2% to 55.8%.

[0083] The above description is merely a specific implementation of this application. Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working process described above can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here. It should be understood that the protection scope of this application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this application, and these modifications or substitutions should all be covered within the protection scope of this application.

Claims

1. A nickel-containing composite, characterized in that, The raw materials include: Iron ore powder, the total iron content in the iron ore powder is ≥ 50wt.%, SiO2≤9wt.%, Al2O3≤3wt.%; Nickel oxide ore powder, the content of nickel oxide in the nickel oxide ore powder is ≥ 10wt.%; Reducing agent; Binder; The content of copper, chromium, cobalt metal oxides in the nickel-containing composite is ≤ 0.5wt.%.

2. The nickel-containing composite according to claim 1, wherein: The total iron content in the iron ore powder is 50wt.%-70wt.%, and the content of nickel oxide in the nickel oxide ore powder is 10wt.%-50wt.%; Optionally, the iron ore powder is selected from a combination of one or more of hematite, magnetite, and limonite; Optionally, the average particle size of the iron ore powder and the nickel oxide ore powder is ≤ 5mm.

3. The nickel-containing complex of claim 1, wherein, The mass ratio of the iron ore powder to the nickel oxide ore powder satisfies 1:(1-4).

4. The nickel-containing complex of claim 1, wherein, The mixture of the iron ore powder and the nickel oxide ore powder is mixed with the reducing agent in a mass ratio of (1-4):1; The mixture after the reaction of the iron ore powder and the nickel oxide ore powder is mixed with the binder in a mass ratio of (2-8):1; Optionally, the reducing agent is one or more of carbon powder, graphite powder, coke, and straw.

5. The nickel-containing complex of claim 1, wherein, The reducing agent includes one or a mixture of two or more of carbon powder, coke, and graphite; Optionally, the average particle size of the reducing agent is 0.5mm-1mm.

6. The nickel-containing complex of claim 1, wherein, The binder includes one or a mixture of two or more of organic binder and inorganic binder; Optionally, the inorganic binder includes one or both of bentonite and slaked lime. Optionally, the organic binder includes one or both of Peli Du and modified starch.

7. The nickel-containing composite of claim 1, wherein, The average particle size of the nickel-containing composite is 20mm-30mm.

8. A process for the preparation of a nickel-containing composite as claimed in any one of claims 1 to 7, characterized in that The method includes: Crushing and processing iron ore and nickel oxide ore to obtain a mixture of iron ore and nickel oxide ore powder; Adding a reducing agent to the mixture of iron ore and nickel oxide ore powder for dispersion and heating treatment to obtain a blended powder; or, Mixing iron ore and nickel oxide ore with a reducing agent for crushing, dispersion, and heating treatment to obtain a blended powder; Mixing the blended powder with a binder and performing molding treatment to obtain a nickel-containing composite product.

9. The method of claim 8, wherein the nickel-containing composite is prepared by a process comprising: The step of adding a reducing agent to the mixture of iron ore and nickel oxide ore powder for dispersion and heating treatment includes: Stirring and reacting the mixture of iron ore and nickel oxide ore powder with the reducing agent at 450°C-550°C for 30 minutes-60 minutes; Optionally, the step of mixing the blended powder with a binder and performing molding treatment includes: Mixing the blended powder with a binder and pressing into a briquetted shape by a briquetting machine to obtain a nickel-containing composite in the form of briquettes; Optionally, the nickel-containing composite is in the form of briquettes.

10. Use of the nickel-containing composite according to any one of claims 1-7 in smelting nickel-containing steel.

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