Niobium-iron alloy product and preparation method thereof

Abstract

The invention discloses a niobium-iron alloy product and a preparation method thereof, and belongs to the technical field of metallurgy, and the preparation method comprises the steps that niobium-containing waste residues and waste materials are selected as preparation raw materials, and the minimum value of the niobium content in the niobium-containing waste residues and waste materials is 5%; the preparation raw materials are placed in an electric arc furnace, then a reducing agent and an auxiliary are added for primary smelting, the smelting temperature is 2000-2400 DEG C, and the niobium-iron alloy is obtained; and refining the niobium-iron alloy by adopting a universal refining furnace to obtain a niobium-iron alloy product. The technical effects that the niobium-iron alloy product is obtained with the waste residues as the preparation raw materials, and the source of the niobium-iron alloy raw materials is enriched are achieved.

Description

Technical Field

[0001] The present application relates to the field of metallurgical technology, and in particular to a niobium-iron alloy product and a preparation method thereof. Background Art

[0002] Ferroniobium is mainly used for smelting high-temperature alloys, stainless steel and high-strength low-alloy steel. In stainless steel and heat-resistant steel, niobium reacts with carbon in the steel to form stable niobium carbide, which is evenly distributed at the grain boundaries of the steel, preventing the grains of the steel from growing at high temperatures, refining the steel structure, and improving the strength, toughness and creep properties of the steel.

[0003] Niobium ferroconcentrate is the main raw material for smelting niobium ferroalloy, and its niobium content is usually greater than 25wt%. However, although the content of niobium, iron and other elements in ore resources is rich, the source is single, and the labor cost and environmental impact of ore mining are extremely high. Summary of the invention

[0004] The main purpose of the present application is to provide a ferroniobium alloy product and a preparation method thereof, aiming to solve the technical problem that the raw material source of ferroniobium alloy is single and the sustainable development is poor.

[0005] To achieve the above objectives, the present application provides a method for preparing a ferroniobium alloy product, comprising:

[0006] Selecting niobium-containing waste slag as the preparation raw material, wherein the minimum niobium content in the niobium-containing waste slag is 5%;

[0007] Placing the prepared raw materials in an electric arc furnace, adding a reducing agent and an auxiliary agent for preliminary smelting at a smelting temperature of 2000-2400° C., and obtaining ferroniobium alloy;

[0008] The ferroniobium alloy is refined by a universal refining furnace to obtain a ferroniobium alloy product.

[0009] The present application uses niobium-containing waste slag as the raw material for preparing niobium-iron alloy products. The niobium content in the niobium-containing waste slag is much lower than that in the niobium-iron concentrate, and it also contains a certain amount of iron. By using the preparation method of the present application, a directly usable niobium-iron alloy product can be prepared from niobium-containing waste slag with a minimum niobium content of 5%. An electric arc furnace is used for preliminary smelting. At a temperature of 2000-2400°C, the niobium-containing waste slag reacts with a reducing agent to reduce niobium oxide and iron oxide. At the same time, the additive can prevent the local reaction from being too violent to obtain niobium-iron alloy. A universal refining furnace is further used to refine the niobium-iron alloy to improve the purity of the niobium-iron alloy and obtain a niobium-iron alloy product that can be directly used.

[0010] In one embodiment, the reducing agent includes at least one of carbon, silicon and active metal.

[0011] Carbon, silicon and active metals are all reducing. Carbon is converted into gaseous carbon oxides after redox reaction. Active metals are gaseous at smelting temperature and can form less residue in ferroniobium alloy. Silicon oxides produced by oxidation of silicon can also be removed during the refining process.

[0012] In one embodiment, the auxiliary agent includes at least one of a sodium source and a calcium source.

[0013] The sodium source and calcium source as additives can reduce the contact area between the reducing agent and the molten niobium-containing waste slag and waste materials, thereby preventing the local reaction from being too intense.

[0014] In one embodiment, the time of the preliminary smelting is 4-6 hours.

[0015] If the initial smelting time is too short, the reduction will not be sufficient, while if the smelting time is too long, the purity of the niobium iron alloy will not be improved much and energy consumption will increase.

[0016] In one embodiment, the refining time is 5-8 hours.

[0017] If the refining time is too short, it cannot effectively improve the purity; if the refining time is too long, the energy consumption will be too high.

[0018] In one embodiment, the refining temperature is 2200-2800°C.

[0019] If the refining temperature is too low, it will not be conducive to improving the purity of ferroniobium alloy, and if the refining temperature is too high, it will cause great waste of energy.

[0020] In one embodiment, the mass ratio between the niobium-containing waste slag and the reducing agent is 100:10-100:20.

[0021] If the amount of reducing agent added is too low, the reduction of niobium-containing waste slag and waste will not be sufficient. If the amount of reducing agent added is too high, more impurities may be formed and the purity of niobium-iron alloy may be affected.

[0022] In one embodiment, the mass ratio between the niobium-containing waste slag and the additive is 100:10-100:15.

[0023] If the amount of additive added is too low, it cannot effectively control the intensity of the reaction. If the amount of additive added is too high, the reaction rate will be excessively reduced and the reduction process will be slow.

[0024] In one embodiment, the niobium content of the ferroniobium alloy product is 50%-70%.

[0025] The ferroniobium alloy prepared by the method of the embodiment of the present application has a niobium element content that meets the content standards of common ferroniobium alloy grades on the market and can be directly used as an alloy additive for steelmaking.

[0026] In addition, to achieve the above-mentioned purpose, the present application also provides a ferroniobium alloy product, and the ferroniobium alloy product is prepared by the preparation method of the ferroniobium alloy product as described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present drawings or related technologies, the drawings required for use in the embodiments or related technical descriptions will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present drawings. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0028] Figure 1 This is a schematic diagram of a process of one embodiment of a method for preparing a ferroniobium alloy product of the present application.

[0029] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0030] It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0031] Hereinafter, the ferroniobium alloy product and the method for preparing the same of the present application are specifically disclosed in detail with appropriate reference to the accompanying drawings. However, there may be cases where unnecessary detailed descriptions are omitted. For example, there may be cases where detailed descriptions of well-known matters and repeated descriptions of actually the same structures are omitted. This is to avoid the following description from becoming unnecessarily lengthy and to facilitate the understanding of those skilled in the art. In addition, the accompanying drawings and the following descriptions are provided for those skilled in the art to fully understand the present application and are not intended to limit the subject matter described in the claims.

[0032] "Scope" disclosed in the present application is limited in the form of lower limit and upper limit, and a given range is limited by selecting a lower limit and an upper limit, and the selected lower limit and upper limit define the boundary of a special range. The scope limited in this way can be including end values ​​or not including end values, and can be arbitrarily combined, that is, any lower limit can be combined with any upper limit to form a scope. For example, if the scope of 60-120 and 80-110 is listed for a specific parameter, it is understood that the scope of 60-110 and 80-120 is also expected. In addition, if the minimum range values ​​1 and 2 are listed, and if the maximum range values ​​3, 4 and 5 are listed, the following scope can be all expected: 1-3, 1-4, 1-5, 2-3, 2-4 and 2-5. In the present application, unless otherwise specified, the numerical range "ab" represents the abbreviation of any real number combination between a and b, wherein a and b are real numbers. For example, the numerical range "0-5" means that all real numbers between "0-5" are listed in this document, and "0-5" is just an abbreviation of these numerical combinations. In addition, when a parameter is expressed as an integer ≥ 2, it is equivalent to disclosing that the parameter is, for example, an integer of 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, etc.

[0033] Unless otherwise specified, all embodiments and optional embodiments of the present application can be combined with each other to form a new technical solution.

[0034] Unless otherwise specified, all technical features and optional technical features of this application can be combined with each other to form a new technical solution.

[0035] If there is no special explanation, all steps of the present application can be performed sequentially or randomly, preferably sequentially. For example, the method includes steps (a) and (b), which means that the method may include steps (a) and (b) performed sequentially, or may include steps (b) and (a) performed sequentially. For example, the method may further include step (c), which means that step (c) may be added to the method in any order. For example, the method may include steps (a), (b) and (c), or may include steps (a), (c) and (b), or may include steps (c), (a) and (b), etc.

[0036] If there is no special explanation, the "include" and "comprising" mentioned in this application are open-ended or closed-ended. For example, the "include" and "comprising" may mean that other components not listed may also be included or only the listed components may be included or only the listed components may be included.

[0037] If not specifically stated, in this application, the term "or" is inclusive. For example, the phrase "A or B" means "A, B, or both A and B". More specifically, any of the following conditions satisfies the condition "A or B": A is true (or exists) and B is false (or does not exist); A is false (or does not exist) and B is true (or exists); or both A and B are true (or exist).

[0038] The present application provides a method for preparing a ferroniobium alloy product. Figure 1 In this embodiment, the method for preparing the ferroniobium alloy product includes:

[0039] Step S10, selecting niobium-containing waste slag as a preparation raw material, wherein the minimum niobium content in the niobium-containing waste slag is 5%;

[0040] Step S20, placing the prepared raw material in an electric arc furnace, adding a reducing agent and an auxiliary agent for preliminary smelting at a smelting temperature of 2000-2400° C., to obtain ferroniobium alloy;

[0041] Step S30, refining the ferroniobium alloy in a universal refining furnace to obtain a ferroniobium alloy product.

[0042] The present application uses niobium-containing waste slag as the raw material for preparing niobium-iron alloy products. The niobium content in the niobium-containing waste slag is much lower than that in niobium-iron concentrate, and it also contains a certain amount of iron. By using the preparation method of the present application, a directly usable niobium-iron alloy product can be prepared from niobium-containing waste slag with a minimum niobium-iron content of 5%. It can be understood that the niobium-containing waste slag can be the scraps produced during the niobium-iron smelting process.

[0043] The electric arc furnace is used for preliminary smelting. At a temperature of 2000-2400°C, the state of the niobium-containing waste slag tends to be liquid, and can react with the reducing agent to reduce niobium oxide and iron oxide. At the same time, the additive can prevent the local reaction from being too intense to obtain niobium iron alloy. The electric arc furnace can be a DC electric arc furnace, and the smelting temperature can be 2000°C, 2050°C, 2100°C, 2150°C, 2200°C, etc.

[0044] After the preliminary smelting, the ferroniobium alloy is further refined by a universal refining furnace, which can improve the purity of the ferroniobium alloy and obtain a ferroniobium alloy product that can be directly used. The universal refining furnace is a new type of energy-saving and environmentally friendly smelting equipment, which has a stable voltage and can save electricity. It can be understood that the ferroniobium alloy in this embodiment refers to the product of preliminary smelting, and the ferroniobium alloy product refers to the refined product. Refining can improve the purity of the ferroniobium alloy, so that the ferroniobium content in the ferroniobium alloy product is greater than that of the ferroniobium alloy.

[0045] In some feasible embodiments, the reducing agent includes at least one of carbon, silicon and active metal. Carbon, silicon and active metal are all reducing. Carbon is converted into gaseous carbon oxides after the reduction reaction. Active metals are gaseous at smelting temperature and can form less residue in ferroniobium alloy. The product after the oxidation of silicon can also be removed during the refining process. It is understood that the active metal can include at least one of sodium, sodium alloy, calcium and calcium alloy. Sodium, sodium alloy, calcium and calcium alloy have low boiling points and high activity, and can fully reduce niobium oxide and iron oxide.

[0046] In some feasible embodiments, the auxiliary agent includes at least one of a sodium source and a calcium source. The sodium source and the calcium source as auxiliary agents can reduce the contact area between the reducing agent and the molten niobium-containing waste slag and waste material to prevent the local reaction from being too intense. Specifically, the sodium source can include at least one of sodium hydroxide and sodium carbonate. The calcium source can include at least one of calcium hydroxide, calcium oxide and calcium carbonate.

[0047] In some feasible implementations, the initial smelting time is 4-6 hours, for example, 4 hours, 4.5 hours, 5 hours, 5.5 hours, 6 hours, etc. If the initial smelting time is too short, the reduction is not sufficient, while if the smelting time is too long, the purity of the ferroniobium alloy is not improved much and energy consumption is increased.

[0048] In some feasible implementations, the refining time is 5-8 hours, for example, 5 hours, 5.5 hours, 6 hours, 6.5 hours, 7 hours, 7.5 hours, 8 hours, etc. If the refining time is too short, it cannot effectively improve the purity, and if the refining time is too long, the energy consumption is too large. It is understandable that the refining time can be adjusted according to the initial smelting time, so that the refining time is longer than the initial smelting time, so as to improve the purity of the ferroniobium alloy product.

[0049] In some feasible embodiments, the refining temperature is 2200-2800°C, for example, 2200°C, 2250°C, 2300°C, 2350°C, 2400°C, 2450°C, 2500°C, 2550°C, 2600°C, 2700°C, 2800°C, etc. If the refining temperature is too low, it is not conducive to improving the purity of the ferroniobium alloy, and if the refining temperature is too high, a large amount of energy is wasted. It is understandable that the refining temperature tends to be set higher than the temperature of the initial smelting to achieve a better refining effect.

[0050] In some feasible implementations, the niobium content in the ferroniobium alloy product is 50%-70%, for example, 50%, 60%, 70%, etc. It is understandable that the niobium content in the ferroniobium alloy product prepared by the method of the embodiment of the present application meets the content standards of ferroniobium alloy grades commonly found on the market, and can be directly used as an alloy additive in the process of steelmaking and smelting high-temperature alloys.

[0051] In some feasible embodiments, the mass ratio between the niobium-containing waste slag and the reducing agent is 100:10-100:20, for example, 100:10, 100:12, 100:15, 100:18, 100:20, etc. If the amount of reducing agent added is too low, the reduction of the niobium-containing waste slag is not sufficient, and if the amount of reducing agent added is too high, more impurities may be formed and the purity of the ferroniobium alloy may be affected.

[0052] In some feasible embodiments, the mass ratio of the niobium-containing waste slag and the additive is 100:10-100:15, for example, 100:10, 100:11, 100:13, 100:15, etc. If the amount of additive added is too low, it cannot effectively control the severity of the reaction. If the amount of additive added is too high, the reaction rate is excessively reduced and the reduction process is slow.

[0053] The embodiment of the present application also provides a ferroniobium alloy product, which is prepared by the preparation method of the ferroniobium alloy product described in the above embodiment. The present application uses niobium-containing waste slag as the raw material for preparing the ferroniobium alloy product. The niobium content in the niobium-containing waste slag is much lower than that in the niobium-containing concentrate, and it also contains a certain amount of iron. By using the preparation method of the present application, a directly usable ferroniobium alloy product can be prepared from niobium-containing waste slag with a minimum niobium content of 5%. An electric arc furnace is used for preliminary smelting. At a temperature of 2000-2400°C, the niobium-containing waste slag reacts with a reducing agent to reduce niobium oxide and iron oxide. At the same time, the additive can prevent the local reaction from being too violent to obtain ferroniobium alloy. The ferroniobium alloy is further refined by a universal refining furnace to improve the purity of the ferroniobium alloy and obtain a ferroniobium alloy product that can be directly used.

[0054] The present application is described below with reference to specific embodiments and comparative examples.

[0055] Example 1

[0056] (1) selecting niobium-containing waste slag as the preparation raw material, wherein the niobium content in the niobium-containing waste slag is 5%;

[0057] (2) placing the prepared raw materials in an electric arc furnace, adding a reducing agent and an auxiliary agent for preliminary smelting at a smelting temperature of 2200° C. for 5 hours to obtain ferroniobium alloy;

[0058] (3) The ferroniobium alloy is refined in a universal refining furnace at a refining temperature of 2500°C for 7 hours to obtain a ferroniobium alloy product.

[0059] The reducing agent is carbon and the auxiliary agent is sodium carbonate. 100 parts by weight of niobium-containing waste slag, 15 parts by weight of reducing agent and 12 parts by weight of auxiliary agent.

[0060] Example 2

[0061] (1) selecting niobium-containing waste slag as the preparation raw material, wherein the niobium content in the niobium-containing waste slag is 5%;

[0062] (2) placing the prepared raw materials in an electric arc furnace, adding a reducing agent and an auxiliary agent for preliminary smelting at a smelting temperature of 2000° C. for 5 hours to obtain ferro-niobium alloy;

[0063] (3) The ferroniobium alloy is refined in a universal refining furnace at a refining temperature of 2200° C. for 7 h to obtain a ferroniobium alloy product.

[0064] The reducing agent is carbon and the auxiliary agent is sodium carbonate. 100 parts by weight of niobium-containing waste slag, 15 parts by weight of reducing agent and 12 parts by weight of auxiliary agent.

[0065] Example 3

[0066] (1) selecting niobium-containing waste slag as the preparation raw material, wherein the niobium content in the niobium-containing waste slag is 5%;

[0067] (2) placing the prepared raw materials in an electric arc furnace, adding a reducing agent and an auxiliary agent for preliminary smelting at a smelting temperature of 2400° C. for 5 hours to obtain ferro-niobium alloy;

[0068] (3) The ferroniobium alloy is refined in a universal refining furnace at a refining temperature of 2800°C for 7 hours to obtain a ferroniobium alloy product.

[0069] The reducing agent is carbon and the auxiliary agent is sodium carbonate. 100 parts by weight of niobium-containing waste slag, 15 parts by weight of reducing agent and 12 parts by weight of auxiliary agent.

[0070] Example 4

[0071] (1) selecting niobium-containing waste slag as the preparation raw material, wherein the niobium content in the niobium-containing waste slag is 5%;

[0072] (2) placing the prepared raw materials in an electric arc furnace, adding a reducing agent and an auxiliary agent for preliminary smelting at a smelting temperature of 2200° C. for 6 hours to obtain ferroniobium alloy;

[0073] (3) The ferroniobium alloy is refined in a universal refining furnace at a refining temperature of 2500°C for 8 hours to obtain a ferroniobium alloy product.

[0074] The reducing agent is carbon and the auxiliary agent is sodium carbonate. 100 parts by weight of niobium-containing waste slag, 15 parts by weight of reducing agent and 12 parts by weight of auxiliary agent.

[0075] Example 5

[0076] (1) selecting niobium-containing waste slag as the preparation raw material, wherein the niobium content in the niobium-containing waste slag is 5%;

[0077] (2) placing the prepared raw materials in an electric arc furnace, adding a reducing agent and an auxiliary agent for preliminary smelting at a smelting temperature of 2200° C. for 5 hours to obtain ferroniobium alloy;

[0078] (3) The ferroniobium alloy is refined in a universal refining furnace at a refining temperature of 2500°C for 7 hours to obtain a ferroniobium alloy product.

[0079] The reducing agent is silicon and the auxiliary agent is sodium carbonate. 100 parts by weight of niobium-containing waste slag, 15 parts by weight of reducing agent and 12 parts by weight of auxiliary agent.

[0080] Example 6

[0081] (1) selecting niobium-containing waste slag as the preparation raw material, wherein the niobium content in the niobium-containing waste slag is 5%;

[0082] (2) placing the prepared raw materials in an electric arc furnace, adding a reducing agent and an auxiliary agent for preliminary smelting at a smelting temperature of 2200° C. for 5 hours to obtain ferroniobium alloy;

[0083] (3) The ferroniobium alloy is refined in a universal refining furnace at a refining temperature of 2500°C for 7 hours to obtain a ferroniobium alloy product.

[0084] The reducing agent is carbon and the auxiliary agent is sodium carbonate. 100 parts by weight of niobium-containing waste slag, 10 parts by weight of the reducing agent and 12 parts by weight of the auxiliary agent.

[0085] Example 7

[0086] (1) selecting niobium-containing waste slag as the preparation raw material, wherein the niobium content in the niobium-containing waste slag is 5%;

[0087] (2) placing the prepared raw materials in an electric arc furnace, adding a reducing agent and an auxiliary agent for preliminary smelting at a smelting temperature of 2200° C. for 5 hours to obtain ferroniobium alloy;

[0088] (3) The ferroniobium alloy is refined in a universal refining furnace at a refining temperature of 2500°C for 7 hours to obtain a ferroniobium alloy product.

[0089] The reducing agent is carbon and the auxiliary agent is sodium carbonate. 100 parts by weight of niobium-containing waste slag, 20 parts by weight of the reducing agent and 12 parts by weight of the auxiliary agent.

[0090] Example 8

[0091] (1) selecting niobium-containing waste slag as the preparation raw material, wherein the niobium content in the niobium-containing waste slag is 7%;

[0092] (2) placing the prepared raw materials in an electric arc furnace, adding a reducing agent and an auxiliary agent for preliminary smelting at a smelting temperature of 2200° C. for 5 hours to obtain ferroniobium alloy;

[0093] (3) The ferroniobium alloy is refined in a universal refining furnace at a refining temperature of 2500°C for 7 hours to obtain a ferroniobium alloy product.

[0094] The reducing agent is carbon and the auxiliary agent is sodium carbonate. 100 parts by weight of niobium-containing waste slag, 15 parts by weight of reducing agent and 12 parts by weight of auxiliary agent.

[0095] Example 9

[0096] (1) selecting niobium-containing waste slag as the preparation raw material, wherein the niobium content in the niobium-containing waste slag is 5%;

[0097] (2) placing the prepared raw materials in an electric arc furnace, adding a reducing agent and an auxiliary agent for preliminary smelting at a smelting temperature of 2200° C. for 5 hours to obtain ferroniobium alloy;

[0098] (3) The ferroniobium alloy is refined in a universal refining furnace at a refining temperature of 2500°C for 7 hours to obtain a ferroniobium alloy product.

[0099] The reducing agent is carbon and the auxiliary agent is sodium carbonate. 100 parts by weight of niobium-containing waste slag, 15 parts by weight of reducing agent and 15 parts by weight of auxiliary agent.

[0100] Example 10

[0101] (1) selecting niobium-containing waste slag as the preparation raw material, wherein the niobium content in the niobium-containing waste slag is 8%;

[0102] (2) placing the prepared raw materials in an electric arc furnace, adding a reducing agent and an auxiliary agent for preliminary smelting at a smelting temperature of 2300° C. for 5 hours to obtain ferroniobium alloy;

[0103] (3) The ferroniobium alloy is refined in a universal refining furnace at a refining temperature of 2600°C for 8 hours to obtain a ferroniobium alloy product.

[0104] The reducing agent is silicon and the auxiliary agent is sodium carbonate. 100 parts by weight of niobium-containing waste slag, 18 parts by weight of reducing agent and 13 parts by weight of auxiliary agent.

[0105] The purity and yield of the ferroniobium alloys prepared in Examples 1 to 10 were tested. The test results are shown in Table 1 below.

[0106] Table 1

[0107]

[0108]

[0109] It can be seen from Table 1 that the method for preparing the ferroniobium alloy product in the embodiment of the present application can obtain a product with a purity that meets the requirements of the ferroniobium alloy grade.

[0110] The serial numbers of the above-mentioned embodiments of the present application are for description only and do not represent the advantages or disadvantages of the embodiments.

[0111] The above are only preferred embodiments of the present application, and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A method for preparing a ferroniobium alloy product, characterized in that: The method for preparing the ferroniobium alloy product comprises the following steps: Selecting niobium-containing waste slag as the preparation raw material, wherein the minimum niobium content in the niobium-containing waste slag is 5%; Placing the prepared raw materials in an electric arc furnace, adding a reducing agent and an auxiliary agent for preliminary smelting at a smelting temperature of 2000-2400° C., and obtaining ferroniobium alloy; The ferroniobium alloy is refined by a universal refining furnace to obtain a ferroniobium alloy product.

2. The method for preparing the ferroniobium alloy product according to claim 1, characterized in that: The reducing agent includes at least one of carbon element, silicon element and active metal.

3. The method for preparing the ferroniobium alloy product according to claim 1, characterized in that: The auxiliary agent includes at least one of a sodium source and a calcium source.

4. The method for preparing the ferroniobium alloy product according to claim 1, characterized in that: The time for the preliminary smelting is 4-6 hours.

5. The method for preparing the ferroniobium alloy product according to claim 1, characterized in that: The refining time is 5-8h.

6. The method for preparing the ferroniobium alloy product according to claim 1, characterized in that: The refining temperature is 2200-2800°C.

7. The method for preparing the ferroniobium alloy product according to claim 1, characterized in that: The mass ratio between the niobium-containing waste slag and the reducing agent is 100:10-100:

20.

8. The method for preparing a ferro-niobium alloy product according to claim 1, characterized in that: The mass ratio between the niobium-containing waste slag and the additive is 100:10-100:

15.

9. The method for preparing a ferro-niobium alloy product according to claim 1, characterized in that: The content of niobium element in the ferroniobium alloy product is 50%-70%.

10. A ferroniobium alloy product, characterized in that: The ferroniobium alloy product is prepared by the method for preparing a ferroniobium alloy product according to any one of claims 1 to 9.

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