Method for reducing furnace lining erosion in smelting process of aluminothermic ferrovanadium alloy

Abstract

The invention discloses a method for reducing furnace lining erosion in the smelting process of aluminothermy ferrovanadium alloy. The method comprises the following steps that S1, proportioning is conducted according to the proportion of vanadium-containing materials, the proportion of slag formers and the comprehensive aluminum proportioning coefficient; s2, after the first batch of raw materials enter the furnace to be completely molten and a good low-melting-point molten pool is formed, a second batch of raw materials are added for second-stage smelting; s3, after the second batch of raw materials enter the furnace to be completely molten and form a low-melting-point molten pool, continuously electrifying until the thermit reaction is completed; and S4, after the reaction is completed, electrifying is stopped, the molten slag metal is transferred to a cooling area to be cooled, then furnace disassembling and crushing are conducted, and qualified alloy products and smelting slag are obtained. According to the method, by adjusting the type of the vanadium source entering the furnace and the slag former adding system, a high-calcium, high-vanadium, low-magnesium and low-aluminum low-melting-point slag system with low heat release is formed in the initial stage of the thermit reaction, furnace lining erosion is remarkably reduced, excessive aluminum is added in the subsequent smelting process for thermit reduction, and effective regulation and control of slag and alloy components are further achieved.

Description

Technical Field

[0001] The invention relates to the technical field of metallurgy, and in particular to a method for reducing furnace lining erosion in a ferrovanadium alloy smelting process by aluminothermic method. Background Art

[0002] Ferrovanadium is the most widely used vanadium-containing microalloyed master alloy. Vanadium can combine with carbon and nitrogen in steel to form fine and dispersed carbonitrides, which play a role in fine grain strengthening and precipitation strengthening, thereby improving the comprehensive mechanical properties of steel. At present, ferrovanadium is mainly prepared by aluminothermic reduction or silicon thermal reduction process. The aluminothermic reduction method has become the mainstream preparation method of ferrovanadium alloy due to its advantages of high unit heat release, good product quality and environmental friendliness. At present, the processes for producing ferrovanadium by aluminothermic reduction mainly include straight tube furnace one-step method, tilting furnace two-step method and multi-stage method. However, no matter which process is used, the aluminothermic reduction process always faces common technical difficulties such as severe erosion of the furnace lining by the high melting point slag system formed by the reaction by-products, especially the scouring and melting of the furnace lining caused by the instantaneous high heat release in the initial stage of the aluminothermic reaction, which seriously affects the slag characteristics and furnace life of the aluminothermic reduction process.

[0003] In response to the above technical difficulties, the Chinese patent with publication number CN115319034A discloses a vanadium-iron alloy casting ingot mold and its preparation method. By modularizing the inner lining of the casting ingot mold according to a certain composition and ratio, the lining erosion can be significantly reduced, the infiltration alloy output can be reduced, and the surface finish of the alloy cake can be improved. The Chinese patent with publication number CN117144087A discloses a method for regulating the slag characteristics and smelting efficiency of vanadium-iron alloy, which fully utilizes the advantages of vanadates with large heat release and good mass transfer conditions, improves the slag composition and slag characteristics at different smelting stages, and thus realizes efficient reduction and separation in the smelting process. The Chinese patent with publication number CN101100720A discloses a production process for smelting vanadium iron with calcium vanadate. The resulting smelted vanadium iron has good quality and high vanadium yield, which meets the new industrial needs of high economic value and low environmental pollution.

[0004] It can be seen from the above-mentioned patent disclosure that the current vanadium-ferroalloy smelting mixed materials and smelting process require the addition of some slag-forming agents mainly composed of basic oxides and corresponding vanadates, as well as changes in the furnace lining structure and material to improve the slag characteristics and furnace lining erosion.

[0005] In order to further solve the extreme situation that the intense heat in the initial stage of traditional aluminothermic reduction leads to severe erosion of the furnace lining, without changing the composition and proportion of the main materials in the traditional aluminothermic vanadium-ferroalloy smelting process, it is necessary to redistribute the ingredients and vanadium source and slag-forming agent in the smelting process.

[0006] In view of this, the existing technology should be improved. Summary of the invention

[0007] The main purpose of the present invention is to provide a method for reducing the lining erosion in the aluminothermic vanadium ferroalloy smelting process, by redistributing the ingredients and the vanadium source and slag-forming agent in the smelting process, so as to form a low-melting-point slag system and a low-melting-point primary alloy mainly composed of high calcium, high vanadium, low magnesium and low aluminum with low heat release in the process, and adding excess aluminum in the subsequent smelting process for aluminothermic reduction, further realizing the effective regulation of slag and alloy composition, thereby significantly reducing the lining erosion in the aluminothermic reaction process and extending the life of the lining on the basis of ensuring the reduction effect and product quality.

[0008] According to one aspect of the present invention, a method for reducing lining corrosion in a ferrovanadium alloy smelting process by the aluminothermic process is provided, which comprises the following steps: S1. When the comprehensive batching coefficient of a single furnace is the same as the theoretical batching coefficient, batching is performed according to the proportion of vanadium-containing materials, the proportion of slag-forming agent and the comprehensive aluminum batching coefficient to obtain the first batch of raw materials and the second batch of raw materials; S2, after the first batch of raw materials are completely melted into the furnace and a good low-melting-point molten pool is formed, the second batch of raw materials are quickly added for the second stage of smelting; S3, after the second batch of raw materials are completely melted into the furnace and a good low-melting-point molten pool is formed, the power is continuously supplied until the thermite reaction is completed; S4. When the reaction is completed, stop the power supply, transfer the molten slag to the cooling area, cool it, dismantle the furnace and crush it to obtain qualified alloy products and smelting slag.

[0009] According to one embodiment of the present invention, the vanadium-containing material includes a low-valent vanadium-containing material and a high-valent vanadium-containing material. The vanadium trioxide contained in the low-valent vanadium-containing material reacts with refractory components such as MgO in the furnace lining to generate a vanadium-containing spinel phase (such as MgV 2 O 4 ) and other compounds. These compounds form a dense protective layer on the surface of the furnace lining, which can prevent further penetration and erosion of the slag. During the smelting process, the furnace lining will be eroded and worn by the slag and furnace gas. 2 O 3 The addition of low-cost vanadium-containing materials such as vanadium helps reduce this erosion and wear because they can change the fluidity and viscosity of the slag, making it easier to be discharged rather than adhering to the furnace lining.

[0010] According to one embodiment of the present invention, the content of low-price vanadium-containing materials in the first batch of raw materials is ≥ the content of low-price vanadium-containing materials in the second batch of raw materials, the slag-forming agent ratio of the first batch of raw materials is > the slag-forming agent ratio of the second batch of raw materials, and the comprehensive aluminum-matching coefficient of the first batch of raw materials is < the comprehensive aluminum-matching coefficient of the second batch of raw materials. In order to form a low-melting-point slag system and a low-melting-point primary alloy mainly composed of high calcium, high vanadium, low magnesium and low aluminum with low heat release during the smelting process, the vanadium source and slag-forming agent of the ingredients and smelting process are redistributed.

[0011] According to one embodiment of the present invention, the low-price vanadium-containing material includes vanadium trioxide, and also includes at least one of vanadium-containing dust ash and vanadium-containing enriched material, and the weight ratio of vanadium trioxide to the total low-price vanadium-containing material entering the furnace is not less than 90%. 2 O 3 As an important slag composition adjuster, when its content is not less than 90%, it can significantly affect the melting point, viscosity and other physical properties of the slag, making the slag easier to discharge and reducing energy consumption and time in the smelting process.

[0012] According to one embodiment of the present invention, the high-price vanadium-containing material includes vanadium pentoxide, and also includes at least one of vanadium-containing dust ash and vanadium-containing enriched material, and the weight ratio of vanadium pentoxide to the total high-price vanadium-containing material entering the furnace is not less than 90%.

[0013] According to one embodiment of the present invention, the comprehensive aluminum ratio of a single furnace from batching to iron tapping is 1.00-1.10, the CaO addition amount of a single furnace is 10-20% of the theoretical slag production, and the mass ratio of low-price vanadium-containing materials to high-price vanadium-containing materials is 5:5-8:2.

[0014] According to one embodiment of the present invention, the mass ratio of the low-price vanadium-containing material to the high-price vanadium-containing material in the first batch of raw materials is 8:2-5:5; the mass ratio of the low-price vanadium-containing material to the high-price vanadium-containing material in the second batch of raw materials is 0-8:2.

[0015] According to one embodiment of the present invention, the comprehensive aluminum coefficient of the first batch of raw materials is 0.8-1.0; the comprehensive aluminum coefficient of the second batch of raw materials is 1.0-1.4.

[0016] According to one embodiment of the present invention, the amount of CaO added to the first batch of raw materials is 20-40% of the theoretical slag production, and the amount of CaO added to the second batch of raw materials is 0-20% of the theoretical slag production.

[0017] According to one embodiment of the present invention, the first batch of raw materials and the second batch of raw materials are evenly divided into two parts according to the total amount of vanadium-containing materials entering the furnace.

[0018] In a method for reducing furnace lining erosion in an aluminothermic vanadium-ferrovanadium alloy smelting process according to an embodiment of the present invention, the method adjusts the type of vanadium source entering the furnace and the slag-forming agent addition system to form a low-melting-point slag system with high calcium, high vanadium, low magnesium and low aluminum with low heat release at the initial stage of thermite reaction, thereby significantly reducing furnace lining erosion, and adding excess aluminum for aluminothermic reduction in the subsequent smelting process to further achieve effective regulation of slag and alloy composition. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solution of the embodiment of the present invention, the drawings required for use in the embodiment will be briefly introduced below. Obviously, the drawings described below are only some implementation cases of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 A process flow chart of a method for reducing lining corrosion in a ferrovanadium alloy smelting process by the aluminothermic process according to an exemplary embodiment of the present invention is shown; Figure 2 A schematic diagram of ingredients for a method for reducing lining corrosion in a ferrovanadium smelting process by the aluminothermic process according to an exemplary embodiment of the present invention is shown. DETAILED DESCRIPTION

[0021] The detailed description of the following embodiments is used to exemplify the principles of the present invention, but cannot be used to limit the scope of the present invention. The present invention can be implemented in many different forms and is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

[0022] The present invention provides these embodiments to make this disclosure thorough and complete, and fully express the scope of the present invention to those skilled in the art. It should be noted that unless otherwise specifically stated, the relative arrangement of the parts and steps, the composition of materials, numerical expressions and numerical values ​​set forth in these embodiments should be interpreted as being merely exemplary, rather than as limiting.

[0023] It should be noted that, in the description of the present invention, unless otherwise specified, the meaning of "multiple" is greater than or equal to two; the terms "upper", "lower", "left", "right", "inner", "outer", etc., indicating the orientation or positional relationship, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0024] It should also be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances. When a specific device is described as being located between a first device and a second device, there may or may not be an intermediate device between the specific device and the first device or the second device.

[0025] All terms used in the present invention have the same meanings as those understood by those of ordinary skill in the art to which the present disclosure belongs, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries, for example, should be interpreted as having meanings consistent with their meanings in the context of the relevant technology, and should not be interpreted in an idealized or extremely formal sense, unless explicitly defined herein.

[0026] Technologies, methods, and apparatus known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, these technologies, methods, and apparatus should be considered part of the specification.

[0027] like Figure 1 As shown, the present invention provides a method for reducing furnace lining corrosion in a ferrovanadium alloy smelting process by the aluminothermic process, which comprises the following steps: S1. When the comprehensive batching coefficient of a single furnace is the same as the theoretical batching coefficient, batching is performed according to the proportion of vanadium-containing materials, the proportion of slag-forming agent and the comprehensive aluminum batching coefficient to obtain the first batch of raw materials and the second batch of raw materials; S2, after the first batch of raw materials are completely melted into the furnace and a good low-melting-point molten pool is formed, the second batch of raw materials are quickly added for the second stage of smelting; S3, after the second batch of raw materials are completely melted into the furnace and a good low-melting-point molten pool is formed, the power is continuously supplied until the thermite reaction is completed; S4. When the reaction is completed, stop the power supply, transfer the molten slag to the cooling area, cool it, dismantle the furnace and crush it to obtain qualified alloy products and smelting slag.

[0028] Among them, the comprehensive batching coefficient of a single furnace is the same as the theoretical batching coefficient, which means that on the premise of ensuring that the batching coefficients of raw materials such as reducing agent, vanadium source, slag-forming agent, etc. in the single furnace smelting process meet the theoretical proportions, the batching coefficients of the first batch and the second batch of raw materials may be different from the theoretical batching coefficients. For specific batching criteria, please refer to the following embodiments.

[0029] In the method for reducing furnace lining erosion in the aluminothermic vanadium-ferrovanadium alloy smelting process according to an embodiment of the present invention, by redistributing the ingredients and vanadium sources and slag-forming agents in the smelting process, a low-melting-point slag system and a low-melting-point primary alloy mainly composed of high calcium, high vanadium, low magnesium and low aluminum with low heat release are formed in the process, and excess aluminum is added in the subsequent smelting process for aluminothermic reduction, thereby further achieving effective regulation of the slag and alloy composition, thereby significantly reducing the furnace lining erosion in the aluminothermic reaction process and extending the furnace lining life on the basis of ensuring the reduction effect and product quality.

[0030] In some specific embodiments, the vanadium-containing material includes a low-valent vanadium-containing material and a high-valent vanadium-containing material.

[0031] In some specific embodiments, the content of low-price vanadium-containing materials in the first batch of raw materials is ≥ the content of low-price vanadium-containing materials in the second batch of raw materials, the slag-forming agent ratio of the first batch of raw materials is > the slag-forming agent ratio of the second batch of raw materials, and the comprehensive aluminum coefficient of the first batch of raw materials is < the comprehensive aluminum coefficient of the second batch of raw materials.

[0032] Based on the above embodiments, the low-price vanadium-containing material includes vanadium trioxide and at least one of vanadium-containing dust ash and vanadium-containing enriched material, and the weight ratio of vanadium trioxide to the total low-price vanadium-containing material entering the furnace is not less than 90%.

[0033] In some specific embodiments, the high-price vanadium-containing material includes vanadium pentoxide, and also includes at least one of vanadium-containing dust ash and vanadium-containing enriched material, and the weight ratio of vanadium pentoxide to the total high-price vanadium-containing material entering the furnace is not less than 90%.

[0034] In some specific embodiments, the comprehensive aluminum ratio of a single furnace from batching to iron tapping is 1.00-1.10, the CaO addition amount of a single furnace is 10-20% of the theoretical slag production, and the mass ratio of low-price vanadium-containing materials to high-price vanadium-containing materials is 5:5-8:2.

[0035] like Figure 2 As shown, based on the above embodiments, the mass ratio of the low-price vanadium-containing material to the high-price vanadium-containing material in the first batch of raw materials is 8:2-5:5; the mass ratio of the low-price vanadium-containing material to the high-price vanadium-containing material in the second batch of raw materials is 0-8:2.

[0036] In some specific embodiments, the comprehensive aluminum coefficient of the first batch of raw materials is 0.8-1.0; the comprehensive aluminum coefficient of the second batch of raw materials is 1.0-1.4.

[0037] Based on the above embodiments, the amount of CaO added to the first batch of raw materials is 20-40% of the theoretical slag production, and the amount of CaO added to the second batch of raw materials is 0-20% of the theoretical slag production.

[0038] In some specific embodiments, the first batch of raw materials and the second batch of raw materials are evenly divided into two portions according to the total amount of vanadium-containing materials entering the furnace. Evenly dividing the vanadium-containing materials into two portions can ensure that the vanadium content in each portion of the raw materials is relatively stable, avoiding fluctuations in the smelting process caused by uneven materials. Evenly distributed vanadium-containing materials help reduce safety hazards in the smelting process, such as risks of local overheating and explosion, and improve the safety of the smelting process.

[0039] The present application is described below with reference to specific embodiments.

[0040] Example 1 Batching principle: the comprehensive aluminum matching coefficient of a single furnace is 1.00, the amount of CaO added to a single furnace is 10% of the theoretical slag output, and the mass ratio of low-priced vanadium-containing materials to high-priced vanadium-containing materials is 5:5. The batching system for the two batches of raw materials is as follows: ① The first batch of raw materials: the comprehensive aluminum matching coefficient is 0.9, the amount of CaO added to a single furnace is 20% of the theoretical slag output, and the mass ratio of low-priced vanadium-containing materials to high-priced vanadium-containing materials is 5:5; ② The second batch of raw materials: the comprehensive aluminum matching coefficient is 1.1, the amount of CaO added to a single furnace is 0% of the theoretical slag output, and the mass ratio of low-priced vanadium-containing materials to high-priced vanadium-containing materials is 5:5.

[0041] Implementation effect: According to the above batching conditions, after the first batch of raw materials are put into the furnace for smelting and a molten pool is formed, the second batch of raw materials are quickly added for the second stage of smelting. After the second batch of raw materials are completely melted, the power is continuously turned on until the aluminothermic reaction is completed, and then the furnace is dismantled to obtain vanadium-ferroalloy and smelting slag. The vanadium content of the obtained waste slag is 2.7%, the MgO content is 14.5%, the corresponding vanadium smelting yield is 95.4%, and the furnace lining erosion is 124kg / t alloy (equivalent to FeV50).

[0042] Example 2 Batching principle: the comprehensive aluminum matching coefficient of a single furnace is 1.05, the amount of CaO added to a single furnace is 15% of the theoretical slag output, and the mass ratio of low-priced vanadium-containing materials to high-priced vanadium-containing materials is 5:5. The batching system for the two batches of raw materials is as follows: ① The first batch of raw materials: the comprehensive aluminum matching coefficient is 0.9, the amount of CaO added to a single furnace is 20% of the theoretical slag output, and the mass ratio of low-priced vanadium-containing materials to high-priced vanadium-containing materials is 5:5; ② The second batch of raw materials: the comprehensive aluminum matching coefficient is 1.2, the amount of CaO added to a single furnace is 10% of the theoretical slag output, and the mass ratio of low-priced vanadium-containing materials to high-priced vanadium-containing materials is 5:5.

[0043] Implementation effect: According to the above batching conditions, after the first batch of raw materials are put into the furnace for smelting and a molten pool is formed, the second batch of raw materials are quickly added for the second stage of smelting. After the second batch of raw materials are completely melted, the power is continuously turned on until the aluminothermic reaction is completed, and then the furnace is dismantled to obtain vanadium-ferroalloy and smelting slag. The vanadium content of the obtained waste slag is 1.6%, and the MgO content is 12.6%, corresponding to a vanadium smelting yield of 97.2%, and the furnace lining erosion is 111kg / t alloy (equivalent to FeV50).

[0044] Example 3 Batching principle: the comprehensive aluminum matching coefficient of a single furnace is 1.05, the amount of CaO added to a single furnace is 15% of the theoretical slag output, and the mass ratio of low-priced vanadium-containing materials to high-priced vanadium-containing materials is 6:4. The batching system for two batches of raw materials is as follows: ① The first batch of raw materials: the comprehensive aluminum matching coefficient is 0.9, the amount of CaO added to a single furnace is 20% of the theoretical slag output, and the mass ratio of low-priced vanadium-containing materials to high-priced vanadium-containing materials is 7:3; ② The second batch of raw materials: the comprehensive aluminum matching coefficient is 1.2, the amount of CaO added to a single furnace is 10% of the theoretical slag output, and the mass ratio of low-priced vanadium-containing materials to high-priced vanadium-containing materials is 5:5.

[0045] Implementation effect: According to the above batching conditions, after the first batch of raw materials are put into the furnace for smelting and a molten pool is formed, the second batch of raw materials are quickly added for the second stage of smelting. After the second batch of raw materials are completely melted, the power is continuously turned on until the aluminothermic reaction is completed, and then the furnace is dismantled to obtain vanadium-ferroalloy and smelting slag. The vanadium content of the obtained waste slag is 1.3%, the MgO content is 11.8%, the corresponding vanadium smelting yield is 97.8%, and the furnace lining erosion is 99kg / t alloy (equivalent to FeV50).

[0046] Example 4 Batching principle: the comprehensive aluminum matching coefficient of a single furnace is 1.10, the amount of CaO added to a single furnace is 20% of the theoretical slag output, and the mass ratio of low-priced vanadium-containing materials to high-priced vanadium-containing materials is 8:2. The batching system for the two batches of raw materials is as follows: ① The first batch of raw materials: the comprehensive aluminum matching coefficient is 0.8, the amount of CaO added to a single furnace is 40% of the theoretical slag output, and the mass ratio of low-priced vanadium-containing materials to high-priced vanadium-containing materials is 8:2; ② The second batch of raw materials: the comprehensive aluminum matching coefficient is 1.4, the amount of CaO added to a single furnace is 0% of the theoretical slag output, and the mass ratio of low-priced vanadium-containing materials to high-priced vanadium-containing materials is 8:2.

[0047] Implementation effect: According to the above batching conditions, after the first batch of raw materials are put into the furnace for smelting and a molten pool is formed, the second batch of raw materials are quickly added for the second stage of smelting. After the second batch of raw materials are completely melted, the power is continuously turned on until the aluminothermic reaction is completed, and then the furnace is dismantled to obtain vanadium-ferroalloy and smelting slag. The vanadium content of the obtained waste slag is 0.8%, the MgO content is 9.9%, the corresponding vanadium smelting yield is 98.7%, and the furnace lining erosion is 78kg / t alloy (equivalent to FeV50).

[0048] Comparative Example 1 According to the principle of single furnace comprehensive aluminum coefficient of 1.00, single furnace CaO addition of 10% of theoretical slag production, low-price vanadium-containing materials of 0, all high-price vanadium oxides, all raw materials are mixed evenly at one time and added to the smelting furnace for one-step smelting, and the power is continuously turned on until the aluminum heat reaction is completed, and the furnace is dismantled to obtain vanadium iron alloy and smelting slag. The vanadium content of the obtained waste slag is 3.3%, the MgO content is 15.7%, the corresponding vanadium smelting yield is 94.3%, and the furnace lining erosion is 135kg / t alloy (equivalent to FeV50).

[0049] Test Example 1 The main technical indicators of test examples 1 to 4 and comparative example 1 are shown in the table.

[0050] The calculation formula of vanadium smelting yield is: vanadium smelting yield = vanadium mass fraction in smelting slag × slag volume ÷ vanadium content in raw materials × 100%; The calculation formula for the first-time qualified rate is: first-time qualified rate = 1-slag inclusion rate × 100%.

[0051]

[0052] The method of the present invention takes into account the influence of CaO-MgO-Al 2 O 3 The main factors affecting the melting point of the slag system include, but are not limited to, raw material composition, reaction temperature, reaction time, and chemical composition of the slag system. In order to optimize the smelting process, this method utilizes the characteristics of the thermite reaction by adjusting the type of vanadium source entering the furnace and the addition system of slag-forming agents.

[0053] In the early stage of the thermite reaction, the method precisely controls the raw material ratio so that the reaction can form a low melting point slag system with high calcium, high vanadium, low magnesium and low aluminum with low heat release characteristics. This slag system not only helps to reduce energy consumption during the smelting process, but also significantly reduces the erosion of the furnace lining, prolongs the service life of the smelting equipment, and thus reduces production costs.

[0054] More importantly, this method adds excess aluminum for aluminothermic reduction during the subsequent smelting process. This step not only further promotes the effective regulation of slag system and alloy composition, but also improves the flexibility and controllability of the smelting process. By precisely controlling the amount of aluminum added, the slag and alloy composition can be fine-tuned to meet different requirements for product quality and performance.

[0055] The above are exemplary embodiments disclosed in the present invention. The order disclosed in the above embodiments of the present invention is for description only and does not represent the advantages and disadvantages of the embodiments. However, it should be noted that the discussion of any of the above embodiments is only exemplary and is not intended to imply that the scope disclosed in the embodiments of the present invention (including the claims) is limited to these examples. Various changes and modifications may be made without departing from the scope defined in the claims. The functions, steps and / or actions of the method claims according to the disclosed embodiments described herein do not need to be performed in any particular order. In addition, although the elements disclosed in the embodiments of the present invention may be described or required in individual form, they may also be understood as multiple unless explicitly limited to the singular.

[0056] A person skilled in the art should understand that the discussion of any of the above embodiments is only exemplary and is not intended to imply that the scope of the disclosure of the embodiments of the present invention (including the claims) is limited to these examples; under the concept of the embodiments of the present invention, the technical features in the above embodiments or different embodiments can also be combined, and there are many other changes in different aspects of the embodiments of the present invention as described above, which are not provided in detail for the sake of simplicity. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the embodiments of the present invention should be included in the protection scope of the embodiments of the present invention.

Claims

1. A method for reducing furnace lining corrosion in aluminothermic vanadium-ferroalloy smelting process, characterized in that: The following steps are involved: S1. When the comprehensive batching coefficient of a single furnace is the same as the theoretical batching coefficient, batching is performed according to the proportion of vanadium-containing materials, the proportion of slag-forming agent and the comprehensive aluminum batching coefficient to obtain the first batch of raw materials and the second batch of raw materials; S2, after the first batch of raw materials are completely melted into the furnace and a good low-melting-point molten pool is formed, the second batch of raw materials are quickly added for the second stage of smelting; S3, after the second batch of raw materials are completely melted into the furnace and a good low-melting-point molten pool is formed, the power is continuously supplied until the thermite reaction is completed; S4. When the reaction is completed, stop the power supply, transfer the molten slag to the cooling area, cool it, dismantle the furnace and crush it to obtain qualified alloy products and smelting slag.

2. The method for reducing furnace lining corrosion in aluminothermic vanadium ferroalloy smelting process according to claim 1, characterized in that: The vanadium-containing materials include low-valent vanadium-containing materials and high-valent vanadium-containing materials.

3. The method for reducing furnace lining corrosion in aluminothermic vanadium-ferroalloy smelting process according to claim 2, characterized in that: The content of low-price vanadium-containing materials in the first batch of raw materials is ≥ the content of low-price vanadium-containing materials in the second batch of raw materials, the slag-forming agent ratio of the first batch of raw materials is > the slag-forming agent ratio of the second batch of raw materials, and the comprehensive aluminum content coefficient of the first batch of raw materials is < the comprehensive aluminum content coefficient of the second batch of raw materials.

4. The method for reducing furnace lining corrosion in aluminothermic vanadium ferroalloy smelting process according to claim 2, characterized in that: The low-price vanadium-containing material includes vanadium trioxide, and also includes at least one of vanadium-containing dust ash and vanadium-containing enriched material, and the weight ratio of vanadium trioxide to the total low-price vanadium-containing material entering the furnace is not less than 90%.

5. The method for reducing furnace lining corrosion in aluminothermic vanadium-ferroalloy smelting process according to claim 2, characterized in that: The high-price vanadium-containing material includes vanadium pentoxide, and also includes at least one of vanadium-containing dust ash and vanadium-containing enriched material, and the weight ratio of vanadium pentoxide to the total high-price vanadium-containing material entering the furnace is not less than 90%.

6. The method for reducing furnace lining corrosion in aluminothermic vanadium ferroalloy smelting process according to claim 2, characterized in that: The comprehensive aluminum coefficient of a single furnace from batching to iron tapping is 1.00~1.10, the CaO addition amount of a single furnace is 10~20% of the theoretical slag output, and the mass ratio of low-price vanadium-containing materials to high-price vanadium-containing materials is 5:5~8:

2.

7. The method for reducing furnace lining corrosion in aluminothermic vanadium-ferroalloy smelting process according to claim 2, characterized in that: The mass ratio of the low-price vanadium-containing material to the high-price vanadium-containing material in the first batch of raw materials is 8:2-5:5; the mass ratio of the low-price vanadium-containing material to the high-price vanadium-containing material in the second batch of raw materials is 0-8:

2.

8. The method for reducing furnace lining corrosion in aluminothermic vanadium-ferroalloy smelting process according to claim 1, characterized in that: The comprehensive aluminum coefficient of the first batch of raw materials is 0.8~1.0; the comprehensive aluminum coefficient of the second batch of raw materials is 1.0~1.

4.

9. The method for reducing furnace lining corrosion in aluminothermic vanadium-ferroalloy smelting process according to claim 5, characterized in that: The amount of CaO added to the first batch of raw materials is 20-40% of the theoretical slag production, and the amount of CaO added to the second batch of raw materials is 0-20% of the theoretical slag production.

10. The method for reducing furnace lining corrosion in aluminothermic vanadium-ferroalloy smelting process according to claim 1, characterized in that: The first batch of raw materials and the second batch of raw materials are evenly divided into two parts according to the total amount of vanadium-containing materials entering the furnace.

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