Preparation method of low-aluminum ferrovanadium alloy

Abstract

The application discloses a preparation method of low-aluminum ferrovanadium alloy, which comprises the following steps: crushing ferrovanadium powder and adding the same into a smelting furnace for smelting; continuously supplying power to maintain the smelting temperature after the ferrovanadium powder is completely melted; adding an oxidizing agent, a slagging agent and a component regulating agent for tempering, and stopping power supply after continuous smelting; pouring the smelted low-aluminum ferrovanadium alloy into an ingot mold for cooling to obtain low-aluminum ferrovanadium alloy and vanadium-containing smelting slag. The method can not only realize efficient recycling of ferrovanadium powder, but also obtain low-aluminum ferrovanadium alloy products; the obtained vanadium-containing smelting slag can be recycled as a ferrovanadium alloy production raw material, and realizes online circulation of the smelting slag.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vanadium-iron alloy production, and particularly relates to a preparation method of low-aluminum vanadium-iron alloy. BACKGROUND

[0002] As an alloy additive, vanadium-iron alloy can improve the performance of steel, increase the wear resistance, toughness and strength of steel, and is mostly used as an additive of steel. High-strength low-alloy steel, high-speed steel, tool steel, stainless steel and permanent magnet, etc. are produced. At present, the preparation process of industrialized vanadium-iron alloy mainly includes silicon thermal reduction and aluminum thermal reduction. No matter which process is used, the production process of vanadium-iron alloy will inevitably cause the situation that the impurities such as Al, Si, Mn, C, P and S of part of the alloy in the furnace exceed the standard, which seriously affects the comprehensive yield of vanadium-iron alloy. The excessive Al content cannot meet the production requirements of manufacturers, and the Al content in vanadium-iron alloy needs to be further reduced.

[0003] Therefore, there is a need for improvement in the prior art for a preparation method of low-aluminum vanadium-iron alloy. SUMMARY

[0004] Therefore, the purpose of the embodiments of the present application is to provide a preparation method of low-aluminum vanadium-iron alloy, which can not only realize efficient recycling of vanadium-iron fine powder, but also obtain low-aluminum vanadium-iron alloy products. The obtained vanadium-containing smelting slag can be recycled as a raw material for vanadium-iron alloy production, and the on-line circulation of smelting slag is realized.

[0005] Based on the above purpose, the embodiments of the present application provide a preparation method of low-aluminum vanadium-iron alloy, which comprises the following steps:

[0006] S1, vanadium-iron alloy fine powder is crushed and then added into a smelting furnace for smelting, and after the vanadium-iron alloy fine powder is completely melted, power supply is continuously maintained to maintain the smelting temperature;

[0007] S2, an oxidizing agent, a slag former and a component regulator are added for conditioning, and after continuous smelting, power supply is stopped;

[0008] S3, the smelted slag-lean alloy is poured into an ingot mold for cooling to obtain low-aluminum vanadium-iron alloy and vanadium-containing smelting slag.

[0009] In some embodiments, the V content in the vanadium-iron alloy is 45-80% by weight percentage, and the Al content is Al>1.0%.

[0010] In some embodiments, in S1, the smelting temperature is 1700-2000℃, and the continuous power supply time is 30-90 min, according to the mass percentage.

[0011] In some embodiments, in S1, the vanadium-iron alloy fine powder is crushed to 10-50 mm.

[0012] In some embodiments, the oxidizing agent is vanadium oxide, and the amount of the oxidizing agent added is 2-5% by weight of the vanadium-iron alloy.

[0013] In some embodiments, the vanadium oxide includes vanadium trioxide and vanadium pentoxide.

[0014] In some embodiments, the slagging agent is calcium oxide, and the amount of the slagging agent added is 2-5% by weight of the vanadium-iron alloy.

[0015] In some embodiments, the composition regulator is metallic iron powder, and the amount of the composition regulator added is 0-3% by weight of the vanadium-iron alloy.

[0016] In some embodiments, the CaO content in the vanadium-containing smelting slag is 30-50% by weight, the Al2O3 content is 30-50% by weight, and the TV content is 5-20% by weight.

[0017] In some embodiments, in S2, the duration of the smelting is 30-90 min.

[0018] The present application has at least the following beneficial technical effects:

[0019] (1) Efficient recycling of vanadium-iron fine powder can be achieved, and a low-aluminum vanadium-iron alloy product can also be obtained;

[0020] (2) The obtained vanadium-containing smelting slag can be recycled as a vanadium-iron alloy production raw material, realizing online circulation of the smelting slag. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and other embodiments can also be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0022] Figure 1 A schematic diagram of the embodiment of the preparation method of the low-aluminum vanadium-iron alloy provided by the present application. DETAILED DESCRIPTION

[0023] In order to make the objects, technical solutions and advantages of the present application clearer, the following will further describe the embodiments of the present application in combination with specific embodiments and with reference to the drawings.

[0024] It should be noted that all the expressions of "first" and "second" in the embodiments of the present application are used to distinguish two same name non-same entities or non-same parameters, and the "first" and "second" are only for the convenience of description, and should not be understood as the limitation of the embodiments of the present application, and the subsequent embodiments will not be described one by one.

[0025] As Figure 1 The preparation method of the low-aluminum ferrovanadium alloy provided by the present application comprises the following steps:

[0026] S1, after crushing the ferrovanadium alloy powder, the ferrovanadium alloy powder is added into a smelting furnace for smelting, and after the ferrovanadium alloy powder is completely melted, power supply is continuously maintained to maintain the smelting temperature;

[0027] S2, an oxidizing agent, a slagging agent and a component regulating agent are added for tempering, and after continuous smelting, the power supply is stopped;

[0028] S3, the smelted slag alloy is poured into an ingot mold for cooling to obtain a low-aluminum ferrovanadium alloy and a vanadium-containing smelting slag.

[0029] Further, in S1, the V content in the ferrovanadium alloy is 45-80%, the Al content is Al>1.0%, the ferrovanadium alloy powder is crushed to 10-50mm, and is added into a smelting furnace for smelting, the smelting temperature is 1700-2000℃, and after the ferrovanadium alloy powder is completely melted, power supply is continuously maintained for 30-90min to maintain the smelting temperature.

[0030] Further, in S2, the oxidizing agent is vanadium oxide, and the addition amount of the oxidizing agent is 2-5% of the weight of the ferrovanadium alloy, in some embodiments, the vanadium oxide includes vanadium trioxide and vanadium pentoxide, and in some preferred embodiments, the vanadium oxide is vanadium pentoxide.

[0031] Further, in S2, the addition amount of the slagging agent is 2-5% of the weight of the ferrovanadium alloy. The component regulating agent is metal iron powder, and the addition amount of the component regulating agent is 0-3% of the weight of the ferrovanadium alloy.

[0032] In some embodiments, vanadium pentoxide, calcium oxide and metal iron powder are added for tempering, and after continuous smelting for 30-90min, the power supply is stopped.

[0033] Further, in S3, the aluminum content of the low-aluminum ferrovanadium alloy is below 1.0%, the CaO content in the vanadium-containing smelting slag is 30-50%, the Al2O3 content is 30-50%, and the TV content is 5-20%.

[0034] The present application will be further explained by specific embodiments.

[0035] Embodiment 1

[0036] 100 parts by mass of FeV50 alloy fine powder (V content: 48.5%, Al content: 2.1%) is crushed to 10-50 mm and then added to an electric arc furnace for melting, with the melting temperature maintained at 1700°C. After the alloy fine powder is completely melted, 2 parts by mass of V2O5, 2 parts by mass of CaO, and 1 part by mass of metallic iron are added for tempering, and the electric current is continuously supplied for 30 min. After the tempering and melting are completed, the molten slag-gold mixture is poured into an ingot mold for cooling. After the slag-gold is completely cooled, FeV50 alloy cakes and vanadium-containing smelting slag are obtained by disassembly.

[0037] According to the above smelting conditions and operations, the V and Al contents of the obtained FeV50 alloy are 49.5% and 0.6%, respectively. The Al2O3, CaO, and vanadium contents in the vanadium-containing smelting slag are 43.5%, 48.2%, and 5.8%, respectively.

[0038] Example 2

[0039] 100 parts by mass of FeV50 alloy fine powder (V content: 49.8%, Al content: 1.8%) is crushed to 10-50 mm and then added to an electric arc furnace for melting, with the melting temperature maintained at 2000°C. After the alloy fine powder is completely melted, 5 parts by mass of V2O5, 5 parts by mass of CaO, and 1 part by mass of metallic iron are added for tempering, and the electric current is continuously supplied for 90 min. After the tempering and melting are completed, the molten slag-gold mixture is poured into an ingot mold for cooling. After the slag-gold is completely cooled, FeV50 alloy cakes and vanadium-containing smelting slag are obtained by disassembly.

[0040] According to the above smelting conditions and operations, the V and Al contents of the obtained FeV50 alloy are 50.3% and 0.1%, respectively. The Al2O3, CaO, and vanadium contents in the vanadium-containing smelting slag are 39.6%, 45.3%, and 8.9%, respectively.

[0041] Example 3

[0042] 100 parts by mass of FeV80 alloy fine powder (V content: 78.4%, Al content: 2.7%) is crushed to 10-50 mm and then added to an electric arc furnace for melting, with the melting temperature maintained at 1700°C. After the alloy fine powder is completely melted, 2 parts by mass of V2O5, 2 parts by mass of CaO, and 2 parts by mass of metallic iron are added for tempering, and the electric current is continuously supplied for 30 min. After the tempering and melting are completed, the molten slag-gold mixture is poured into an ingot mold for cooling. After the slag-gold is completely cooled, FeV80 alloy cakes and vanadium-containing smelting slag are obtained by disassembly.

[0043] According to the above smelting conditions and operations, the V and Al contents of the obtained FeV50 alloy are 79.1% and 0.9%, respectively. The Al2O3, CaO, and vanadium contents in the vanadium-containing smelting slag are 39.8%, 47.2%, and 5.4%, respectively.

[0044] Example 4

[0045] 100 parts by mass of FeV80 alloy fine powder (V content 79.2%, Al content 3.3%) is crushed to 10-50 mm and then added into an electric arc furnace for smelting, with the smelting temperature maintained at 2000°C. After the alloy fine powder is completely melted, 5 parts by mass of V2O5, 5 parts by mass of CaO and 1 part by mass of metallic iron are added for tempering, and the power is continuously supplied for 90 min. After the tempering smelting is completed, the molten slag-gold mixture is poured into an ingot mold for cooling, and after the slag-gold is completely cooled, FeV80 alloy cakes and vanadium-containing smelting slag are obtained by disassembly.

[0046] According to the above smelting conditions and operations, the V and Al contents of the obtained FeV50 alloy are 80.7% and 0.2%, respectively. The Al2O3, CaO and vanadium contents in the vanadium-containing smelting slag are 39.2%, 47.7% and 7.8%, respectively.

[0047] The method of the present application can realize efficient recycling of vanadium-iron fine powder, and also obtain a low-aluminum vanadium-iron alloy product. The obtained vanadium-containing smelting slag can be recycled as a raw material for vanadium-iron alloy production, realizing online circulation of the smelting slag.

[0048] The above is an exemplary embodiment disclosed by the present application, but it should be noted that various changes and modifications can be made without departing from the scope of the embodiments disclosed by the present application as defined in the claims. The functions, steps and / or actions of the method claims described herein do not need to be performed in any particular order. In addition, although the elements of the embodiments disclosed by the present application can be described or claimed in individual form, they can also be understood as plural unless explicitly limited as singular.

[0049] It should be understood that, as used herein, the singular forms "a", "an" and "the" are intended to include plural forms, unless the context clearly indicates otherwise. It should also be understood that "and / or" as used herein means any and all possible combinations of one or more of the associated listed items.

[0050] The above embodiment sequence number of the embodiments disclosed by the present application is only for description, and does not represent the advantages and disadvantages of the embodiments.

[0051] Those of ordinary skill in the art can understand that all or part of the steps of the above embodiments can be completed by hardware, or by a program instructing relevant hardware, and the program can be stored in a computer readable storage medium, such as a read-only memory, a magnetic disk or an optical disk.

[0052] Those skilled in the art should understand that the above discussion of any embodiment is only exemplary, and is not intended to mean 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 above embodiments or technical features in different embodiments can also be combined, and there are many other changes of different aspects of the embodiments of the present application as above. In order to be brief, they are not provided in details. Therefore, any omission, modification, equivalent replacement, improvement, etc. made in the spirit and principle of the embodiments of the present application shall be included in the protection scope of the embodiments of the present application.

Claims

1. A method for preparing a low-aluminum ferrovanadium alloy, characterized in that, include: S1 crushes the ferrovanadium alloy fine powder and adds it to the smelting furnace for smelting. After the ferrovanadium alloy fine powder is completely melted, the smelting temperature is maintained by continuous power supply. The ferrovanadium alloy has a V content of 45-80% and an Al content of Al > 1.0%. S2 is conditioned by adding oxidant, slag-forming agent and composition regulator. After continuous smelting, the power supply is stopped. The amount of oxidant added is 2-5% of the weight of ferrovanadium alloy, the amount of slag-forming agent added is 2-5% of the weight of ferrovanadium alloy, and the amount of composition regulator added is 0-3% of the weight of ferrovanadium alloy. S3 pours the smelted low-slag alloy into an ingot mold for cooling to obtain ferrovanadium alloy and vanadium-containing smelting slag; The oxidant is vanadium oxide, and the component regulator is metallic iron powder.

2. The method for preparing the low-aluminum ferrovanadium alloy according to claim 1, characterized in that, By mass percentage, in S1, the melting temperature is 1700~2000℃ and the continuous energizing time is 30~90min.

3. The method for preparing the low-aluminum ferrovanadium alloy according to claim 1, characterized in that, By mass percentage, in S1, the ferrovanadium alloy fine powder is crushed to 10~50mm.

4. The method for preparing the low-aluminum ferrovanadium alloy according to claim 1, characterized in that, The vanadium oxides include vanadium trioxide and vanadium pentoxide.

5. The method for preparing the low-aluminum ferrovanadium alloy according to claim 1, characterized in that, The slag-forming agent is calcium oxide.

6. The method for preparing the low-aluminum ferrovanadium alloy according to claim 1, characterized in that, The vanadium-containing smelting slag contains 30-50% CaO, 30-50% Al2O3, and 5-20% TV by weight percentage.

7. The method for preparing the low-aluminum ferrovanadium alloy according to claim 1, characterized in that, In S2, the continuous melting time is 30~90min.

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