Vanadium alloy slag stopping device and preparation method and application thereof

Abstract

This invention relates to the field of vanadium alloy metallurgical technology, and discloses a vanadium alloy slag-blocking device and its preparation method, comprising: uniformly setting tie bars circumferentially on the inner wall of a ring-shaped rigid structure; preparing a binding layer material, mixing it evenly and filling it into the inner side of the rigid structure, and compacting it by vibration with a vibration device to ensure that the binding material completely wraps the tie bars and adheres to the inner side of the rigid structure; after the binding layer is naturally air-dried to remove water, it is baked multiple times to obtain the vanadium alloy slag-blocking device; wherein, by weight, the binding layer comprises 65-85 parts of corundum slag with different particle sizes, 10-15 parts of coagulant, 10-15 parts of cementitious material, and 5-15 parts of water. This invention also provides this device and its application. This invention utilizes solid waste generated from vanadium ferrometallurgy to prepare a slag-blocking device, reducing raw material costs, improving preparation efficiency, achieving environmentally friendly production, and extending the service life of the slag-blocking device, ensuring efficient and stable operation of vanadium ferrometallurgy.

Description

Technical Field

[0001] This invention relates to the field of vanadium alloy metallurgical technology, and in particular to a vanadium alloy slag-blocking device, its preparation method, and its application. Background Technology

[0002] Vanadium is widely used in metallurgy, aerospace, chemical and other industries in the form of ferrovanadium, vanadium compounds and metallic vanadium. Ferrovanadium is an important alloying additive in the steel industry. Vanadium plays a role in deoxidation and grain refinement in steel. A small amount of vanadium can improve the performance of steel and increase its wear resistance, toughness and strength.

[0003] Domestic ferrovanadium alloy production mainly employs the aluminothermic smelting process, with electric furnaces typically using a two- or three-section structure. During smelting and refining, the aluminothermic reaction is intense, often accompanied by severe material splashing. Therefore, the uppermost furnace ring is usually equipped with a slag-blocking device to prevent vanadium loss due to high-temperature slag splashing. Especially in the top-ignition method for smelting high-vanadium ferrovanadium, the upper furnace ring not only serves as a slag-blocking device but also needs to deflect some of the splashed molten slag to achieve "slag protection of the lance," making the working conditions extremely harsh. The high-temperature molten iron and slag generated in the top-ignition method for smelting high-vanadium ferrovanadium exceed 1800℃, and the slag-blocking furnace ring is subjected to severe scouring and thermal erosion from the high-temperature liquid alloy for extended periods, resulting in a short service life and frequent replacement.

[0004] Currently, slag retaining furnace rings are generally made from magnesia and brine as the main raw materials. This traditional method has the following prominent disadvantages: the traditional mixing and casting process has a long preparation cycle and low production efficiency; brine is usually mainly composed of magnesium chloride, and a large amount of toxic and harmful gases are generated during the baking process of the slag retaining furnace ring; the price of refractory raw materials such as magnesia is high and significantly affected by market fluctuations, which directly increases the preparation cost of slag retaining furnace rings and further compresses the profit margins of enterprises in the context of already limited profits in the ferrovanadium alloy industry.

[0005] Therefore, there is a need to improve the preparation method of vanadium alloy slag-blocking devices in the existing technology. Summary of the Invention

[0006] In view of this, the purpose of this invention is to provide a vanadium alloy slag-blocking device, its preparation method and application, which utilizes solid waste generated from vanadium ferrometallurgy to prepare the slag-blocking device, thereby reducing raw material costs, improving preparation efficiency, achieving environmentally friendly production, extending the service life of the slag-blocking device, and ensuring the efficient and stable operation of vanadium ferrometallurgy.

[0007] To achieve the above objectives, embodiments of the present invention provide a method for preparing a vanadium alloy slag-blocking device, comprising the following steps: S1 has tie rods evenly distributed circumferentially on the inner sidewall of the ring-shaped rigid body structure; S2 Prepare the knotting layer material, mix it evenly and fill it into the inner side of the rigid structure. Use a vibration compaction device to compact it so that the knotting material completely wraps the tendons and fits the inner side of the rigid structure. After the S3 knotting layer is naturally air-dried and dehydrated, it is baked multiple times to obtain a vanadium alloy slag-blocking device. The bridging layer, by weight, comprises 65-85 parts of corundum slag with different particle sizes, 10-15 parts of coagulant, 10-15 parts of cementitious material, and 5-15 parts of water.

[0008] In some embodiments, the corundum slag with different particle size ranges includes: 5-10 parts of corundum slag with a particle size ≤ 2 mm, and 60-75 parts of corundum slag with a particle size of 2 mm < ≤ 15 mm.

[0009] In some embodiments, the corundum slag is corundum slag produced by smelting ferrovanadium, wherein Al2O3≥80% and SiO2≤0.5%.

[0010] In some embodiments, the coagulant is mainly composed of calcium aluminate, wherein Al2O3 ≥ 60% and CaO ≤ 40%.

[0011] In some embodiments, the cementitious material is high-alkali metal dust produced by ferrovanadium smelting, wherein Na2O+K2O≥12%.

[0012] In some embodiments, in S2, after being compacted by the vibration compaction device, the porosity of the knotted layer is ≤2%.

[0013] In some embodiments, in S3, multiple baking specifically involves placing the knotted layer in an environment with a temperature ≥80°C for 5-6 hours, and repeating this baking step 4-5 times.

[0014] In some embodiments, in S1, the tie rod is a strip or column-shaped anchor rod that extends radially inward along the inner wall of the annular rigid body structure and is uniformly welded and fixed.

[0015] Another aspect of the present invention provides a vanadium alloy slag-blocking device, which is prepared using the above method and includes: an annular rigid body structure, tie rods uniformly arranged circumferentially on the inner wall of the annular rigid body structure, and a knotted layer that is densely filled in the inner side of the annular rigid body structure and completely wraps the tie rods.

[0016] In another aspect, the present invention provides an application of the vanadium alloy slag-blocking device described above, characterized in that it is applied in the aluminothermic smelting process of ferrovanadium as a slag-blocking furnace ring in the upper furnace ring of the smelting electric furnace.

[0017] The present invention has at least the following beneficial technical effects: (1) The method of reducing the cost of the slag blocking device in this invention is to replace the magnesium sand with self-produced corundum slag to bind the slag blocking device. At the same time, the high viscosity and alkali activation characteristics of potassium oxide and sodium oxide in the high alkali metal dust produced by smelting ferrovanadium are utilized to replace the traditional brine binder. This not only realizes the comprehensive utilization of high alkali metal dust, but also reduces the cost of purchased raw materials. (2) By utilizing the characteristics of inter-particle disturbance, migration, gap filling, and stabilization during the vertical vibration of the particle bed, the material spontaneously forms a dense layer due to the "coarse particle interlocking - fine particle dense filling" effect generated during the vibration process, thereby replacing manual tamping and compaction. This not only further reduces the cost of furnace ring manufacturing, but also expands the application boundaries of particle physics in metallurgical engineering, and has strong demonstration significance for other fields; (3) Compared with existing slag-blocking device preparation methods, this invention has lower preparation costs, higher preparation efficiency, and no waste gas production. It also features a shorter furnace ring preparation cycle, higher efficiency, and readily available and inexpensive raw materials. The furnace ring prepared using this invention has a service life that is more than doubled, and the cost is reduced by two-thirds. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other embodiments can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of an embodiment of the preparation method of the vanadium alloy slag-blocking device provided by the present invention. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be further described in detail below with reference to specific examples and the accompanying drawings.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. For example, terms such as “length,” “width,” “upper,” “lower,” “left,” “right,” “front,” “rear,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” and “outer” indicate orientations or positions based on the orientations or positions shown in the accompanying drawings and are for ease of description only, and should not be construed as limiting the technical solution.

[0022] The terms "comprising" and "having," and any variations thereof, used in the specification, claims, and accompanying drawings of this invention are intended to cover non-exclusive inclusion; the terms "first," "second," etc., used in the specification, claims, and accompanying drawings are used to distinguish different objects, not to describe a particular order. "A plurality of" means two or more, unless otherwise explicitly specified.

[0023] In the description and claims of this invention and the foregoing drawings, when an element is referred to as "fixed to," "mounted to," "disposed on," or "connected to" another element, it can be located directly or indirectly on that other element. For example, when an element is referred to as "connected to" another element, it can be directly or indirectly connected to that other element.

[0024] Furthermore, the reference to "embodiment" herein means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0025] like Figure 1 The diagram shows a method for preparing the vanadium alloy slag-blocking device provided by the present invention, comprising the following steps: S1 has tie rods evenly distributed circumferentially on the inner sidewall of the ring-shaped rigid body structure; S2 Prepare the knotting layer material, mix it evenly and fill it into the inner side of the rigid structure. Use a vibration compaction device to compact it so that the knotting material completely wraps the tendons and fits the inner side of the rigid structure. After the S3 knotting layer is naturally air-dried and dehydrated, it is baked multiple times to obtain a vanadium alloy slag-blocking device. The bridging layer, by weight, comprises 65-85 parts of corundum slag with different particle sizes, 10-15 parts of coagulant, 10-15 parts of cementitious material, and 5-15 parts of water.

[0026] Furthermore, in S1, the annular rigid body structure can be a cylindrical annular rigid body structure or an overall hollow annular cylindrical structure with a hollow cavity inside. The cylinder has an annular outer side wall and an annular inner side wall, and the inner side wall is used to arrange tie rods in the circumference. The whole is a hollow closed-loop rigid cylinder, which is lightweight and has high structural strength, and is suitable for conventional steelmaking slag-blocking conditions. Those skilled in the art can adjust the specific setting of the annular rigid body structure according to actual needs.

[0027] Furthermore, the corundum slag with different particle size ranges includes: 5-10 parts of corundum slag with a particle size ≤ 2 mm, and 60-75 parts of corundum slag with a particle size < 2 mm ≤ 15 mm. The corundum slag is corundum slag produced by ferrovanadium smelting, wherein Al2O3 ≥ 80% and SiO2 ≤ 0.5%. The main component of the coagulant is calcium aluminate, wherein Al2O3 ≥ 60% and CaO ≤ 40%. The cementitious material is high-alkali metal dust produced by ferrovanadium smelting, wherein Na2O + K2O ≥ 12%.

[0028] Furthermore, in S2, after being compacted by the vibration compaction device, the porosity of the knotted layer is ≤2%.

[0029] Furthermore, the multiple baking process specifically involves placing the knotted layer in an environment with a temperature ≥80℃ for 5-6 hours, and repeating this baking step 4-5 times.

[0030] Furthermore, the tie rods are strip-shaped or column-shaped anchoring bars that extend radially inward along the inner wall of the annular rigid structure and are uniformly welded and fixed.

[0031] This invention also provides a vanadium alloy slag-blocking device, prepared using the above method. The device comprises: an annular rigid structure, tie rods uniformly arranged circumferentially on the inner wall of the annular rigid structure, and a knotting layer densely filling the inner side of the annular rigid structure and completely enclosing the tie rods. By weight, the knotting layer comprises 5-10 parts of corundum slag with a particle size ≤2mm, 60-75 parts of corundum slag with a particle size ≤15mm (2mm < particle size), 10-15 parts of coagulant, 10-15 parts of cementitious material, and 5-15 parts of water. The porosity of the knotting layer is ≤2%.

[0032] Another aspect of the present invention provides an application of a vanadium alloy slag-blocking device, which is applied in the aluminothermic smelting process of ferrovanadium as a slag-blocking furnace ring in the upper furnace ring of the smelting electric furnace. It is adapted to the upper ignition method for smelting high vanadium iron and is used to block high-temperature slag splashing and achieve slag splash protection for the lance.

[0033] The present invention will be further explained and described below with reference to specific embodiments.

[0034] Example 1 The rigid structure of the slag-blocking device has evenly distributed reinforcing ribs on its inner side to fix the mold. The weight composition of the bridging layer includes the following: 5 parts of corundum slag with a particle size ≤2mm, 60 parts of corundum slag with a particle size of 2mm < ≤15mm, 15 parts of coagulant, 15 parts of cementitious material, and 5 parts of water. The corundum slag is corundum slag produced by ferrovanadium smelting, the main component of the coagulant is calcium aluminate, and the cementitious material is high-alkali metal dust produced by ferrovanadium smelting. The materials are weighed and mixed evenly according to this ratio, and the mixed materials are added into the mold. Then, the bridging material is vibrated and compacted by a vibration compaction device. After the bridging layer has solidified naturally, the air-dried slag-blocking device is placed in an environment with a temperature ≥80℃ and baked for 6 hours. After being removed and allowed to cool naturally, this step is repeated 5 times. The material cost of the slag-blocking device is 86 yuan / unit, and the service life is 12 furnaces / unit.

[0035] Example 2 The rigid structure of the slag-blocking device has evenly distributed reinforcing ribs on its inner side to secure the mold. The bridging layer comprises the following components by weight: 10 parts corundum slag with a particle size ≤2mm, 75 parts corundum slag with a particle size ≤15mm (2mm < ≤ 15mm), 5 parts coagulant, 5 parts cementitious material, and 5 parts water. The corundum slag is self-produced corundum slag from ferrovanadium smelting, the coagulant is mainly composed of calcium aluminate, and the cementitious material is high-alkali metal dust from ferrovanadium smelting. The materials are weighed and mixed evenly according to this ratio, then added to the mold, and compacted by a vibration device. After the bridging layer has naturally solidified, the air-dried slag-blocking device is placed in an environment with a temperature ≥80℃ and baked for 5 hours. After cooling naturally, this step is repeated 4 times. The material cost of the slag-blocking device is 88 yuan per unit, and its service life is 12 heats per unit.

[0036] Comparative Example 1 The rigid structure of the slag-blocking device has evenly distributed reinforcing ribs on its inner side to secure the mold. The bridging layer comprises the following components by weight: 15 parts corundum slag with a particle size ≤ 2mm, 55 parts corundum slag with a particle size ≤ 15mm (2mm < 15mm), 6 parts coagulant, and 24 parts water glass. The corundum slag is self-produced corundum slag from ferrovanadium smelting, and the coagulant's main component is calcium aluminate. The materials are weighed and stirred evenly according to this ratio. The mixed material is then added to the mold, and a vibration compaction device is used to vibrate and compact the bridging material. After the bridging layer has naturally solidified, the air-dried slag-blocking device is placed in an environment with a temperature ≥ 180℃ and baked for 6 hours. This step is repeated 6 times. The material cost of the slag-blocking device is 326 yuan per unit, and its service life is 6 furnaces per unit.

[0037] Comparative Example 2 The rigid structure of the slag-blocking device has evenly distributed reinforcing ribs on its inner side to secure the mold. The bridging layer consists of the following weight components: 82 parts sintered magnesia with a particle size ≤5mm and 18 parts brine. These are weighed and mixed evenly according to this ratio. The mixed material is then added to the mold and manually tamped down. After the bridging layer has naturally solidified, the air-dried slag-blocking device is placed in an environment with a temperature ≥500℃ and baked for 6 hours. After cooling naturally, the material cost of the slag-blocking device is 356 yuan per unit, and its service life is 7 furnaces per unit.

[0038] This invention uses self-produced corundum slag from vanadium-iron alloys as the main raw material and self-produced high-alkali metal dust as the cementing agent. It employs a slag-blocking device prepared using a vibration compaction and low-temperature segmented baking process. The material cost is only about 80 yuan per unit, and the service life reaches 12 heats per unit. Comparative Example 1 uses water glass instead of cementing agent, increasing the cost to 326 yuan per unit and reducing the service life to 9 heats per unit. Comparative Example 2 uses magnesia and brine preparation, manual tamping, and high-temperature baking, resulting in the highest cost (356 yuan per unit) and the shortest service life (5 heats per unit). Compared to traditional processes, this invention reduces material costs by more than two-thirds, extends service life by more than double, and avoids the problem of toxic and harmful gases generated during brine baking. The preparation process is more efficient and environmentally friendly, fully meeting the requirements of vanadium alloy smelting.

[0039] The above are exemplary embodiments disclosed in this invention. However, it should be noted that various changes and modifications can be made without departing from the scope of the embodiments of this invention as defined by the claims. The functions, steps, and / or actions of the methods according to the disclosed embodiments described herein do not need to be performed in any particular order. Furthermore, although the elements disclosed in the embodiments of this invention may be described or claimed individually, they may be understood as multiple unless explicitly limited to a singular number.

[0040] It should be understood that, as used herein, unless the context clearly supports an exception. It should also be understood that, as used herein, "and / or" means any and all possible combinations of one or more of the associated listed items.

[0041] The embodiment numbers disclosed in the above embodiments of the present invention are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0042] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the invention (including the claims) is limited to these examples. Within the framework of the invention, technical features of the above embodiments or different embodiments can be combined, and many other variations of different aspects of the invention exist, which are not provided in the details for the sake of brevity. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the invention should be included within the protection scope of the invention.

Claims

1. A method for preparing a vanadium alloy slag-blocking device, characterized in that, include: S1 has tie rods evenly distributed circumferentially on the inner sidewall of the ring-shaped rigid body structure; S2 Prepare the knotting layer material, mix it evenly and fill it into the inner side of the rigid structure. Use a vibration compaction device to compact it so that the knotting material completely wraps the tendons and fits the inner side of the rigid structure. After the knotted layer described in S3 is naturally air-dried and dehydrated, it is baked multiple times to obtain a vanadium alloy slag-blocking device. The bridging layer, by weight, comprises 65-85 parts of corundum slag with different particle sizes, 10-15 parts of coagulant, 10-15 parts of cementitious material, and 5-15 parts of water.

2. The method for preparing the vanadium alloy slag-blocking device according to claim 1, characterized in that, The corundum slag with different particle size ranges includes: 5-10 parts of corundum slag with a particle size ≤ 2 mm, and 60-75 parts of corundum slag with a particle size < 2 mm and ≤ 15 mm.

3. The method for preparing the vanadium alloy slag-blocking device according to claim 1, characterized in that, The corundum slag is corundum slag produced by smelting ferrovanadium, wherein Al2O3≥80% and SiO2≤0.5%.

4. The method for preparing the vanadium alloy slag-blocking device according to claim 1, characterized in that, The coagulant is mainly composed of calcium aluminate, wherein Al2O3 ≥ 60% and CaO ≤ 40%.

5. The method for preparing the vanadium alloy slag-blocking device according to claim 1, characterized in that, The cementitious material is high-alkali metal dust produced by ferrovanadium smelting, wherein Na2O+K2O≥12%.

6. The method for preparing the vanadium alloy slag-blocking device according to claim 1, characterized in that, In S2, after being compacted by the vibration device, the porosity of the knotted layer is ≤2%.

7. The method for preparing the vanadium alloy slag-blocking device according to claim 1, characterized in that, In S3, the multiple baking steps specifically involve placing the knotted layer in an environment with a temperature ≥80℃ for 5-6 hours, and repeating this baking step 4-5 times.

8. The method for preparing the vanadium alloy slag-blocking device according to claim 1, characterized in that, In S1, the tie rod is a strip or column anchor rod that extends radially inward along the inner wall of the annular rigid body structure and is uniformly welded and fixed.

9. A vanadium alloy slag-blocking device, prepared using the method described in any one of claims 1-8, characterized in that, include: The ring-shaped rigid body structure, the tie rods evenly arranged circumferentially on the inner wall of the ring-shaped rigid body structure, and the knotted layer densely filling the inner side of the ring-shaped rigid body structure and completely wrapping the tie rods.

10. An application of the vanadium alloy slag-blocking device as described in claim 9, characterized in that, It is used in the aluminothermic ferrovanadium smelting process as a slag-blocking ring in the upper furnace ring of the smelting electric furnace.

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