Vanadium iron charge structure and method for improving the grinding performance of vanadium iron alloy

Abstract

The present application relates to the alloy smelting technical field, specifically relates to a kind of vanadium-iron furnace charge structure and the method for improving the fine grinding performance of vanadium-iron alloy.The furnace charge structure of the present application is set by specific level and component, and the vanadium-iron alloy is obtained by furnace charge distribution, ignition fuel surface, power smelting, power refining after injection, two-step cooling.The method of the present application fully utilizes the mechanism of energy-containing material automatic heat accumulation by hierarchical distribution, improves the vanadium-iron slag refining effect, improves the vanadium yield, and at the same time, by introducing alloying material through injection, the fine grinding characteristics of vanadium-iron alloy are improved by combining two-step forced cooling measures.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of alloy smelting, and particularly relates to a vanadium-iron furnace charge structure and a method for improving the fine grinding performance of vanadium-iron alloy. BACKGROUND

[0002] Vanadium-iron alloy (especially FeV80) is a high-performance alloy widely used in the fields of steel smelting, aerospace, etc. In order to better apply it in production and life, it is very important to accurately detect the composition of vanadium-iron alloy. If the element content in the vanadium-iron alloy is uneven or inappropriate, it will cause problems such as performance decline and shortened service life of the product during use. However, due to the characteristics of dense structure, hard and difficult to grind of vanadium-iron alloy (especially FeV80), it brings many difficulties to composition detection. At present, in order to ensure the particle size of the raw material required for detection, it often needs to be finely ground for 3-4 times. However, this multiple grinding process undoubtedly also causes the over-oxidation of vanadium-iron alloy, introduces impurity elements affecting the detection results, and causes the deviation and fluctuation of the main element composition of the alloy. At the same time, the grinding medium is severely worn, which brings unnecessary trouble to the actual test operation and is easy to form quality disputes. At present, there are few suitable process improvements for the fine grinding performance of vanadium-iron alloy in the existing technology. The existing technology only discloses that the physical and chemical properties of vanadium-iron slag are improved by improving the composition of the sprayed material to realize slag refining and improve the performance of vanadium-iron alloy. For example, patent CN 106282564B provides a spraying refining method in smelting vanadium-iron alloy, which uses a mixture of aluminum powder and vanadium-iron fine powder in a certain proportion as the spraying material, uses vanadium-iron fine powder as the heat absorber to absorb the excess heat in the spraying process, slows down the spattering degree of the slag, improves the efficiency of vanadium-iron spraying refining, reduces the vanadium content in the slag, and improves the smelting vanadium yield. However, it does not mention the improvement of the fine grinding processing performance of vanadium-iron alloy, and there are few methods that can improve the fine grinding processing performance of vanadium-iron alloy while improving the slag refining effect. Patent document CN110373603A provides a method for using vanadium-aluminum alloy fine powder for vanadium-iron spraying refining, which uses a mixture of aluminum powder and vanadium-aluminum alloy fine powder in a certain proportion as the spraying material to improve the efficiency of vanadium-iron spraying refining, reduce the vanadium content in the slag, improve the smelting vanadium yield, and improve the performance of vanadium-iron alloy. Patent document CN 108330303A provides a new method for preparing medium and high vanadium-iron, which uses vanadium pentoxide and vanadium trioxide as raw materials to smelt medium and high vanadium-iron by the off-furnace method. After the smelting reaction, the process of electric arc heating, spraying aluminum slag, and electric arc heating refining again improves the vanadium recovery rate to more than 98%. However, in the actual smelting process, in order to save energy and smelting time, the reaction conditions can be further optimized to obtain vanadium-iron alloy with better fine grinding performance.

[0003] Therefore, it is urgent to develop a method with strong operability and capable of stably improving the refining effect of molten slag. SUMMARY

[0004] The technical problem to be solved by the present application is to further increase the fine grinding performance of vanadium-iron alloy while saving energy and smelting time, to improve the refining effect of vanadium-iron slag and improve the vanadium yield by using the mechanism of automatic accumulation of reaction heat of energy-containing materials through hierarchical distribution of materials according to the reaction rate and heat release of materials, and to improve the fine grinding characteristics of vanadium-iron alloy by adding alloying materials during the refining process, improving the yield, and combining two-step forced cooling measures.

[0005] The technical solution of the present application is as follows:

[0006] The first aspect of the present application provides a vanadium-iron furnace charge structure, which comprises four layers, the mass ratio of each component of the first layer of furnace charge comprising: vanadium oxide: aluminum: iron: lime = 800-1000: 425-435: 180-200: 100-120, the mass ratio of each component of the second layer of furnace charge comprising: vanadium: aluminum: second iron material: lime = 2000-3000: 800-1000: 140-420: 78-102, the mass ratio of each component of the third layer of furnace charge comprising: iron oxide: aluminum = 3-4: 1, and the mass ratio of each component of the fourth layer of furnace charge comprising: potassium chlorate: aluminum = 1: 2-3.

[0007] Further, the vanadium oxide is vanadium trioxide.

[0008] Further, the aluminum in the first layer of furnace charge is aluminum beans, and the iron is ball-milled iron particles, the vanadium in the second layer of furnace charge is vanadium sheet, and the iron is oil-containing steel scrap, and the iron oxide in the third layer of furnace charge is oil-containing iron oxide.

[0009] Further, the oil content of the oil-containing steel scrap is 0.1% to 5%, and the oil content of the oil-containing iron oxide is 0.1% to 5%.

[0010] Preferably, the oil content of the oil-containing steel scrap is 0.1% to 0.5%, and the oil content of the oil-containing iron oxide is 1% to 5%.

[0011] The second aspect of the present application provides a method for improving the fine grinding performance of vanadium-iron alloy, which comprises the following steps:

[0012] a, the setting of the furnace charge: the furnace charge is set to 4 layers, the mass ratio of each component of the first layer of the furnace charge includes: vanadium oxide: aluminum: iron: lime = 800-1000: 425-435: 180-200: 100-120, the mass ratio of each component of the second layer of the furnace charge includes: vanadium: aluminum: iron: lime = 2000-3000: 800-1000: 140-420: 78-102, the mass ratio of each component of the third layer of the furnace charge includes: iron oxide: aluminum = 3-4: 1; the mass ratio of each component of the fourth layer of the furnace charge includes: potassium chlorate: aluminum = 1: 2-3;

[0013] b, the material is added into the furnace in sequence;

[0014] c, the ignition fuel surface;

[0015] d, power smelting;

[0016] e, after blowing, power refining;

[0017] f, after cooling, vanadium-iron alloy is obtained.

[0018] In the present application, the setting of the furnace charge makes full use of the mechanism of automatic accumulation of reaction heat of the material in the furnace, and according to the difficulty of the material reaction and the heat release amount, the difficult reduction material is placed in the lower part of the furnace charge, and the easy reduction material with large heat release amount is placed in the upper part of the furnace charge.

[0019] Further, in step a, the aluminum in the first layer of the furnace charge is aluminum beans, and the iron is ball-milled iron particles, the vanadium in the second layer of the furnace charge is vanadium sheet, and the iron is oil-containing steel scrap, the iron oxide in the third layer of the furnace charge is oil-containing iron oxide, and the oil content of the oil-containing steel scrap is 0.1%-5%; the oil content of the oil-containing iron oxide is 0.1%-5%.

[0020] Further, the vanadium oxide is di vanadium trioxide.

[0021] Preferably, the oil content of the oil-containing steel scrap is 0.1%-0.5%; the oil content of the oil-containing iron oxide is 1%-5%.

[0022] Further, in step c, the reaction time of the ignition fuel surface is 20-40s.

[0023] Further, in step d, the power smelting time in the power smelting step is 25min-30min.

[0024] Further, in step e, the blowing material used for blowing is a mixture of powdered alloying material metal aluminum powder and silicon-manganese alloy powder.

[0025] In the present application, the metal powder containing alloying elements is blown, then an electrode is inserted into the molten slag to heat and hold, while recovering residual vanadium elements in the molten slag, the vanadium-iron alloy is tempered to change its performance.

[0026] Further, the mass ratio of the aluminum metal powder to the silicon-manganese alloy powder in the mixture is 4-5:1.

[0027] Further, the mass of the injection material is 90-160 kg.

[0028] Further, the time for the power refining in step e is 25-55 min.

[0029] Further, the cooling method in step f includes air cooling and forced cooling after the furnace is disassembled.

[0030] Further, the air cooling time is 4-6 h.

[0031] Further, the forced cooling includes water curtain quenching and water pool quenching, the water curtain quenching is to spray water to rapidly reduce the surface center temperature of the refined material to below 700 DEG C, and the water pool quenching is to sink the material quenched by the water curtain into water.

[0032] The above technical solution has at least the following beneficial effects:

[0033] (1) According to the reaction rate and the heat release amount of the material, the self-heat accumulation type conduction mechanism for reasonably utilizing the reaction heat is used by hierarchical distribution of the material, the principle of automatic accumulation of the reaction heat of the energetic material is used, the refining effect of the vanadium iron slag is improved, the heat required for the reduction reaction and the interference of the primary vanadium metal is ensured, and the smelting reduction and slag depletion are facilitated.

[0034] (2) A vanadium iron furnace charge structure is provided, the oil-containing metallic iron material and the oil-containing oxidized iron scale are comprehensively utilized on a large scale, the selection path of the vanadium iron smelting raw material is expanded, and the oil-containing iron material and the oil-containing oxidized iron scale contain certain oily substances, the oily substances have a certain bonding effect, the vanadium oxide and the aluminum reducing agent can be adhered to the iron material together, the gap between the reaction materials is reduced, the bulk density is increased, the probability of point contact and surface contact is promoted, the vanadium metal is immediately combined with the liquid metal iron after being generated, and the reaction efficiency is improved.

[0035] (3) By adding the alloying material, the primary vanadium metal in the slag is changed into binary or ternary vanadium alloy droplets, the melting point is greatly reduced, the probability of collision and polymerization between the alloy droplets is greatly improved, the yield is improved, and the two-step forced cooling measures are combined to promote the precipitation of the metal compounds with high brittleness in the alloy cake, change the solidification structure, and improve the fine grinding characteristics of the vanadium iron alloy. BRIEF DESCRIPTION OF DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the accompanying drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced. Obviously, the accompanying drawings in the following description only represent some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these accompanying drawings without creative effort.

[0037] Figure 1 The flow chart shows the technical points of the process of the present application. DETAILED DESCRIPTION

[0038] In order to make the objects, technical solutions and advantages of the present application clearer, the embodiments of the present application will be further described in detail below with reference to the accompanying drawings.

[0039] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0040] Unless otherwise defined, all the scientific and technical terms used in the present application have the same meaning as commonly understood by those skilled in the art to which the present application relates.

[0041] The beneficial effects of the present application will be further illustrated below with reference to specific embodiments.

[0042] In the method of the present application, unless otherwise specified, percentages and the like all represent mass percentages.

[0043] Embodiment 1

[0044] The specific content of the present application includes: a, the structure of the furnace charge is set. After the material is prepared, the mixture is divided into four batches. The first batch of mixture is vanadium trioxide, aluminum beans, iron material I and lime, and the mass is 800 kg, 425 kg, 180 kg and 100 kg respectively (i.e. vanadium trioxide: aluminum beans: iron material I: lime = 800:425:180:100), wherein the iron material I is ball mill iron particles; the second batch of mixture is vanadium sheet, aluminum beans, iron material II and lime, and the mass is 2000 kg, 800 kg, 140 kg and 78 kg respectively (i.e. vanadium sheet: aluminum beans: iron material II: lime = 2000:800:140:78), wherein the iron material II is oil-containing steel scrap, and the oil content is 0.1%; the third batch of mixture is iron oxide and aluminum material, and the mass is 60 kg and 20 kg respectively (i.e. iron oxide: aluminum material = 3:1), and the iron oxide is oil-containing iron oxide scale, and the oil content is 1%; the fourth batch of material is potassium chlorate and metal aluminum, and the mass is 10 kg and 20 kg respectively (i.e. potassium chlorate: metal aluminum = 1:2). b, the material is distributed. The first to fourth batches of materials are sequentially added to the furnace to form a furnace charge structure with a certain level; c, the fuel surface is ignited to make it quickly undergo aluminothermic reaction, and the reaction time is 40 s; d, the graphite electrode is lowered to conduct smelting for 30 min; e, 90 kg of a mixture of powdered alloying material metal aluminum powder and silicon-manganese alloy powder in a mass ratio of 5:1 is sprayed; f, after conducting for 55 min, the alloy with slag is air-cooled for 6 h, and after the furnace is disassembled, forced cooling is carried out in two stages. The surface of the alloy cake is immediately sprayed with water after the furnace is disassembled to rapidly cool the surface and center temperature of the alloy cake to about 700℃, the alloy cake is suspended and sunk into water, and finally the vanadium-iron alloy with the required product quality is obtained. Figure 1 Flow chart of technical points of the processes of examples 1-3

[0045] Example 2

[0046] The specific content of the present application includes: a, the structure of the furnace charge is set. After the material is prepared, the mixture is divided into four batches. The first batch of mixture is vanadium trioxide, aluminum beans, iron material I and lime, and the mass is 1000 kg, 435 kg, 200 kg and 120 kg respectively (i.e. vanadium trioxide: aluminum beans: iron material I: lime = 1000:435:200:120), wherein the iron material I is ball mill iron particles; the second batch of mixture is vanadium sheet, aluminum beans, iron material II and lime, and the mass is 3000 kg, 1000 kg, 420 kg and 102 kg respectively (i.e. vanadium sheet: aluminum beans: iron material II: lime = 3000:1000:420:102), wherein the iron material II is oil-containing steel scrap, and the oil content is 0.5%; the third batch of mixture is iron oxide and aluminum material, and the mass is 60 kg and 20 kg respectively (i.e. iron oxide: aluminum material = 3:1, the iron oxide is oil-containing iron oxide scale, and the oil content is 5%); the fourth batch of material is potassium chlorate and metal aluminum, and the mass is 10 kg and 30 kg respectively (i.e. potassium chlorate: metal aluminum = 1:3). b, the material is distributed. The first to fourth batches of materials are sequentially added to the furnace to form a furnace charge structure with a certain level; c, the fuel surface is ignited to make it quickly undergo aluminothermic reaction, and the reaction time is 20 s; d, the graphite electrode is lowered to conduct smelting for 30 min; e, 160 kg of a mixture of powdered alloying material metal aluminum powder:silicon-manganese alloy powder = 4:1 is sprayed; f, after 25 min of power-on, the alloy with slag is air-cooled for 4 h, and after the furnace is disassembled, forced cooling is carried out in two stages, the surface of the alloy cake is immediately water-cooled, the surface center temperature of the alloy cake is quickly reduced to about 700℃, the alloy cake is suspended and sunk into water, and finally the vanadium-iron alloy with the required product quality is obtained.

[0047] Example 3

[0048] The invention includes the following details: a, the structure of the furnace charge. After the material is prepared, the mixture is divided into four batches. The first batch of mixture is vanadium trioxide, aluminum beans, iron material I and lime, with the mass of 900 kg, 430 kg, 190 kg and 110 kg respectively (i.e. vanadium trioxide: aluminum beans: iron material I: lime = 900: 430: 190: 110, wherein the iron material I is ball mill iron particles; the second batch of mixture is vanadium sheet, aluminum beans, iron material II and lime, with the mass of 2500 kg, 900 kg, 280 kg and 90 kg respectively (i.e. vanadium sheet: aluminum beans: iron material II: lime = 2500: 900: 280: 90, wherein the iron material II is oil-containing steel scrap with an oil content of 0.3%; the third batch of mixture is iron oxide and aluminum material, with the mass of 80 kg and 20 kg respectively (i.e. iron oxide: aluminum material = 4: 1, the iron oxide is oil-containing iron oxide scale with an oil content of 3%; the fourth batch of material is potassium chlorate and metal aluminum, with the mass of 10 kg and 25 kg respectively (i.e. potassium chlorate: metal aluminum = 1: 2.5). b, the material distribution. The first to fourth batches of materials are sequentially added to the furnace to form a furnace charge structure with certain levels; c, the ignition of the material surface to make it quickly undergo aluminothermic reaction, with a reaction time of 30 s; d, the graphite electrode is lowered to conduct smelting for 25 min; e, the powder alloying material, i.e. the mixture of metal aluminum powder and silicon-manganese alloy powder = 4.5: 1, is sprayed with a mass of 125 kg; f, after the power is on for 40 min, the alloy with slag is air-cooled for 5 h, and after the furnace is disassembled, the forced cooling is carried out in two stages. The surface of the alloy cake is immediately sprayed with water to cool the surface and center of the alloy cake to about 700℃, and the alloy cake is suspended and sunk into water, so that the vanadium-iron alloy with the required product quality is finally obtained.

[0049] The comparative example 1 uses oil-free raw materials

[0050] The specific content includes: a, the structure of the furnace charge is set. After the material is prepared, the mixture is divided into four batches. The first batch of mixture is vanadium trioxide, aluminum beans, iron material I and lime, and the mass is 900 kg, 430 kg, 190 kg and 110 kg respectively (i.e. vanadium trioxide: aluminum beans: iron material I: lime = 900: 430: 190: 110), wherein the iron material I is ball mill iron particles; the second batch of mixture is vanadium sheet, aluminum beans, iron material II and lime, and the mass is 2500 kg, 900 kg, 280 kg and 90 kg respectively (i.e. vanadium sheet: aluminum beans: iron material II: lime = 2500: 900: 280: 90), wherein the iron material II is oil-free steel scrap; the third batch of mixture is iron oxide and aluminum material, and the mass is 80 kg and 20 kg respectively (i.e. iron oxide: aluminum material = 4: 1), wherein the iron oxide is oil-free iron oxide scale; the fourth batch of material is potassium chlorate and metal aluminum, and the mass is 10 kg and 25 kg respectively (i.e. potassium chlorate: metal aluminum = 1: 2.5). b, the material is distributed. The first to fourth batches of materials are sequentially added to the furnace to form a furnace charge structure with a certain level; c, the fuel is ignited to make it quickly undergo aluminothermic reaction, and the reaction time is 30 s; d, the graphite electrode is lowered to conduct smelting for 25 min; e, 102 kg of powdered metal aluminum powder is sprayed; f, after 40 min of power supply, the alloy with slag is air-cooled for 5 h, and after the furnace is disassembled, forced cooling is carried out in two stages. The surface of the alloy cake is immediately sprayed with water to cool the surface of the alloy cake to about 700℃, and the alloy cake is suspended and sunk into water, and finally the vanadium-iron alloy with the required product quality is obtained.

[0051] The spraying material of Comparative Example 2 does not contain silicon manganese

[0052] Specific content includes: a, the structure of the furnace charge. After the material is prepared, the mixture is divided into 4 batches, the first batch of mixture is vanadium trioxide, aluminum beans, iron material I, lime, the mass is 900kg, 430kg, 190kg and 110kg in turn (that is, vanadium trioxide: aluminum beans: iron material I: lime = 900: 430: 190: 110, wherein the iron material I is ball mill iron particles; the second batch of mixture is vanadium sheet, aluminum beans, iron material II and lime, the mass is 2500kg, 900kg, 280kg and 90kg in turn (that is, vanadium sheet: aluminum beans: iron material II: lime = 2500: 900: 280: 90), wherein the iron material II is oil-containing steel scrap, the oil content is 0.3%; the third batch of mixture is iron oxide, aluminum material, the mass is 80kg, 20kg in turn (that is, iron oxide: aluminum material = 4: 1), the iron oxide is oil-containing iron oxide scale, the oil content is 3%; the fourth batch of material is potassium chlorate, metallic aluminum, the mass is 10kg, 25kg in turn (that is, potassium chlorate: metallic aluminum = 1: 2.5). b, distribution. The first to fourth batches of materials are sequentially added to the furnace to form a furnace charge structure with certain levels; c, the fuel surface is ignited to make it quickly undergo aluminothermic reaction, the reaction time is 30s; d, the graphite electrode is lowered to conduct electric smelting for 25min; e, 102kg of powdered metallic aluminum powder is sprayed; f, after 40min of power supply, the alloy with slag is air-cooled for 5h, and then the alloy cake is sunk into water, finally the vanadium-iron alloy with the required product quality is obtained.

[0053] Comparative example 3

[0054] Specific content includes: a, batching and mixing. The materials required for vanadium-iron smelting are prepared according to the proportions of vanadium trioxide, vanadium sheet, lime, aluminum beans, potassium chlorate, iron material I, iron material II and iron oxide, the mass is 900kg, 2500kg, 200kg, 1375kg, 10kg, 190kg, 280kg and 80kg in turn (that is, vanadium trioxide: vanadium sheet: lime: aluminum beans: potassium chlorate: iron material I: iron material II: iron oxide = 900: 2500: 200: 1375: 10: 190: 280: 80), and then mixed uniformly, wherein the iron material I is ball mill iron particles; wherein the iron material II is oil-containing steel scrap, the oil content is 0.3%; the iron oxide is oil-containing iron oxide scale, the oil content is 3%; b, distribution. The mixed material is added to the furnace; c, the fuel surface is ignited to make it quickly undergo aluminothermic reaction, the reaction time is 60s; d, the graphite electrode is lowered to conduct electric smelting for 125min; e, 102kg of powdered metallic aluminum powder is sprayed; f, after 40min of power supply, the alloy with slag is air-cooled for 5h, and then the alloy cake is sunk into water, finally the vanadium-iron alloy with the required product quality is obtained.

[0055] Comparative mode: the yield of vanadium alloy smelting is counted; the content of Si and Mn in the alloy and the fine grinding index (the time of 200g finished product 100% fine grinding to 200 mesh or below / min) are detected, and the comparison results are shown in Table 1. As shown in the results in Table 1, by using the specific proportion of layered distribution mode, using oil-containing materials, appropriately increasing the total content of elements Si and Mn in the spraying process, and performing two-step forced cooling on the alloy cake, the smelting yield is improved by about 2 percentage points, and the fine grinding time is shortened by about 90 min, and the fine grinding index is greatly improved.

[0056] Table 1 smelting conditions

[0057]

[0058] It should be specifically noted that the above is the exemplary embodiments disclosed by the present application, and the sequence of the above embodiments disclosed by the present application is only for description, and does not represent the advantages and disadvantages of the embodiments. However, it should be noted that the above discussion of any embodiment is only exemplary, and is not intended to imply that the scope of the embodiments disclosed by the present application (including claims) is limited to these examples, and various changes and modifications can be made without departing from the scope defined by the claims. The functions, steps and / or acts of the method claims described in the embodiments disclosed herein do not need to be performed in any specific order. In addition, although the elements disclosed in the embodiments of the present application can be described or claimed in singular form, they can also be understood as plural unless explicitly limited to singular.

[0059] Those skilled in the art should understand that the above discussion of any embodiment is only exemplary, and is not intended to imply that the scope of the embodiments disclosed by the present application (including claims) is limited to these examples; under the idea of the embodiments of the present application, the technical features of the above embodiments or different embodiments can also be combined, and there are many other changes of different aspects of the embodiments of the present application as described above. In order to be brief, they are not provided in details. Therefore, any omission, modification, equivalent replacement, improvement, etc. made within the spirit and principles of the embodiments of the present application should be included in the protection scope of the embodiments of the present application.

Claims

1. A vanadium iron charge structure, characterized in that, The furnace charge structure comprises 4 layers, the mass ratio of each component of the first layer of furnace charge comprises: vanadium oxide: aluminum: iron: lime = 800-1000: 425-435: 180-200: 100-120, the mass ratio of each component of the second layer of furnace charge comprises: vanadium: aluminum: iron: lime = 2000-3000: 800-1000: 140-420: 78-102, the mass ratio of each component of the third layer of furnace charge comprises: iron oxide: aluminum = 3-4: 1; the mass ratio of each component of the fourth layer of furnace charge comprises: potassium chlorate: aluminum = 1: 2-3; The aluminum of the first layer of furnace charge is aluminum bean, and the iron is ball mill iron particle, the vanadium of the second layer of furnace charge is sheet vanadium, and the iron is oil-containing steel scrap, the iron oxide in the third layer of furnace charge is oil-containing iron oxide; The application of the furnace charge structure comprises the following steps: arranging furnace charge, distributing material, igniting material surface, electric smelting, electric refining after blowing, and obtaining vanadium-iron alloy after cooling; The distributing material comprises sequentially adding the first to fourth layers of material into the furnace; The blowing material used in the blowing is powdery alloying material, and the powdery alloying material comprises a mixture of aluminum powder and silicon-manganese alloy powder; The cooling method comprises air cooling and forced cooling after the furnace is disassembled, and the forced cooling comprises water curtain quenching and water pool quenching.

2. The structure of claim 1, wherein The oil-containing rate of the oil-containing steel scrap is 0.1%-5%, and the oil-containing rate of the oil-containing iron oxide is 0.1%-5%.

3. A method of improving the fine grinding performance of ferrovanadium alloy, characterized by, The method comprises the following steps: a. Arranging furnace charge: the furnace charge is arranged into 4 layers, the mass ratio of each component of the first layer of furnace charge comprises: vanadium oxide: aluminum: iron: lime = 800-1000: 425-435: 180-200: 100-120, the mass ratio of each component of the second layer of furnace charge comprises: vanadium: aluminum: second iron material: lime = 2000-3000: 800-1000: 140-420: 78-102, the mass ratio of each component of the third layer of furnace charge comprises: iron oxide: aluminum = 3-4: 1; the mass ratio of each component of the fourth layer of furnace charge comprises: potassium chlorate: aluminum = 1: 2-3; the aluminum of the first layer of furnace charge is aluminum bean, and the iron is ball mill iron particle, the vanadium of the second layer of furnace charge is sheet vanadium, and the iron is oil-containing steel scrap, the iron oxide in the third layer of furnace charge is oil-containing iron oxide; b. Distributing material: sequentially adding the first to fourth layers of material into the furnace; c. Igniting material surface; d. Electric smelting; e. Electric refining after blowing; f. Obtaining vanadium-iron alloy after cooling; The blowing material used in the blowing in step e is powdery alloying material, and the powdery alloying material comprises a mixture of aluminum powder and silicon-manganese alloy powder; The cooling method in step f comprises air cooling and forced cooling after the furnace is disassembled; The air cooling time is 4-6h; The forced cooling comprises water curtain quenching and water pool quenching, the water curtain quenching is to spray water to rapidly reduce the surface center temperature of the refined material to below 700℃, and the water pool quenching is to sink the water curtain quenched material into water.

4. The method of claim 3, wherein, The oil-containing rate of the oil-containing steel scrap is 0.1%-5%, and the oil-containing rate of the oil-containing iron oxide is 0.1%-5%.

5. The method of claim 3, wherein, The reaction time of the ignition fuel surface in step c is 20-40s.

6. The method of claim 3, wherein, The power-on smelting time in step d is 25-30 min.

7. The method of claim 3, wherein, The mass ratio of the aluminum powder to the silicon-manganese alloy powder in the mixture is 4-5:

1.

8. The method of claim 3, wherein, The mass of the injection material is 90-160 kg.

9. The method of claim 3, wherein, The power-on refining time in step e is 25-55 min.

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