Method for realizing ultralow emission and reducing vanadium loss during smelting of high-vanadium iron

Abstract

The invention relates to the technical field of iron smelting and dust removal, and discloses a method for achieving ultralow emission and reducing vanadium loss during high-vanadium iron smelting. The method comprises the following steps: mixing high-calcium and high-magnesium vanadium pentoxide and vanadium pentoxide with an aluminum product in proportion, and adding the mixture into an iron making furnace; heating in the ironmaking furnace to carry out high-temperature reaction so as to introduce smoke dust generated by the reaction into a dust removal system; in the dust removal system, generated smoke dust is subjected to cooling and water melting treatment, and residual smoke subjected to the cooling and water melting treatment is subjected to dehydration treatment and then is discharged. According to the method for achieving ultralow emission and reducing vanadium loss during high-vanadium iron smelting, the smoke emission amount of iron smelting reaction can be reduced, and the vanadium loss can be reduced.

Description

Technical Field

[0001] The present application relates to the technical field of iron smelting dust removal, and in particular to a method for achieving ultra-low emissions and reducing vanadium losses when smelting high-vanadium iron. Background Art

[0002] Vanadium is widely used in metallurgy, aerospace, chemical industry and other industries in the form of ferrovanadium, vanadium compounds and metallic vanadium. Ferrovanadium is an important alloy 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] At present, most vanadium plants in China use the off-furnace method to smelt high-vanadium iron, using vanadium pentoxide, aluminum products, lime and iron filings as raw materials, and adopting the upper ignition smelting reaction, which is an explosive reaction. The reaction process is violent and a large amount of flue gas is generated. Usually, a dust collector is used to capture the generated smoke, but a large amount of high-temperature flue gas will be generated in the instant of reaction. If the flue gas is not effectively treated, the concentration of discharged particulate matter often exceeds the standard; this part of the flue gas is mainly PM10 type particulate matter, which is mainly composed of fine aluminum oxide particles containing vanadium, which will have an adverse effect on the physical and mental health of on-site operators and surrounding residents, and also affect the corporate image. The "Ferroalloy Industry Pollutant Emission Standard" (GB 28666-2012) stipulates the emission limits of atmospheric pollutants for ferroalloy production enterprises, among which the PM10 emission limit of particulate matter is 50mg / m³. The current method of controlling ultra-low emission of PM10 in the ferroalloy industry is mainly to strengthen dust removal through end-of-pipe treatment, including the selection of dust removal equipment and the optimization of dust filter materials. There are few technical measures to control the emission of particulate matter through the selection of raw materials and the optimization of furnace charge structure, and there are even fewer reports in the field of ferrovanadium smelting. Moreover, the data currently reported in the field of ferrovanadium smelting show that the vanadium content in the dust removal ash is too high and needs to be recycled, indicating that the current ultra-low emission in the field of ferrovanadium should also meet the requirements of low concentration of discharged particulate matter and low vanadium loss.

[0004] Therefore, in order to overcome the dual problems of high vanadium loss in the current aluminothermic reduction process and high PM10 concentration in the exhaust particulate matter, it is urgent to explore new improvement methods based on the concept and requirements of ultra-low emissions. Summary of the invention

[0005] In order to provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. The summary is not an extensive review, nor is it intended to identify key / critical elements or delineate the scope of protection of these embodiments, but rather serves as a prelude to the detailed description that follows.

[0006] In view of the shortcomings of the prior art, the embodiments of the present disclosure provide a method for achieving ultra-low emissions and reducing vanadium losses when smelting high-vanadium iron, which can reduce smoke emissions from iron smelting reactions and reduce vanadium losses.

[0007] In a first aspect, an embodiment of the present disclosure provides a method for achieving ultra-low emissions and reducing vanadium loss when smelting high-vanadium iron, comprising the following steps: The high calcium magnesium vanadium pentoxide, vanadium pentoxide and aluminum products are mixed in proportion and added into an ironmaking furnace to form a prefabricated mixture, wherein, by mass percentage, the V2O5 content of the high calcium magnesium vanadium pentoxide is ≥90%, and the CaO content + MgO content is ≥3%; The prefabricated mixture is heated in an ironmaking furnace to generate a high temperature reaction and the smoke generated by the reaction is introduced into a dust removal system; In the dust removal system, the generated smoke is cooled and melted with water, and the remaining smoke after the cooling and melting treatment is discharged after dehydration.

[0008] In the technical solution of the method for achieving ultra-low emissions and reducing vanadium loss when smelting high-vanadium iron, in the prefabricated mixture, the mass ratio of the high-calcium-magnesium vanadium pentoxide, the vanadium pentoxide and the aluminum product is 0:4:2.

[0009] In the technical solution of the method for achieving ultra-low emissions and reducing vanadium loss when smelting high-vanadium iron, in the prefabricated mixture, the mass ratio of the high-calcium-magnesium vanadium pentoxide, the vanadium pentoxide and the aluminum product is: 1:3:1.97-1:3:1.98.

[0010] In the technical solution of the method for achieving ultra-low emissions and reducing vanadium loss when smelting high-vanadium iron, in the prefabricated mixture, the mass ratio of the high-calcium-magnesium vanadium pentoxide, the vanadium pentoxide and the aluminum product is: 4:1:2.4-4:1:2.42.

[0011] In the technical solution of the method for achieving ultra-low emissions and reducing vanadium loss when smelting high-vanadium iron, in the prefabricated mixture, the mass ratio of the high-calcium-magnesium vanadium pentoxide, the vanadium pentoxide and the aluminum product is: 1:4:2.47-1:4:2.48.

[0012] In the technical solution of the above-mentioned method for achieving ultra-low emissions and reducing vanadium losses when smelting high-vanadium iron, the prefabricated mixture is heated in the iron-making furnace to produce a high-temperature reaction and the smoke generated by the reaction is passed into the dust removal system, including: after the prefabricated mixture is added to the iron-making furnace, a self-propagating reaction is carried out by upper ignition and the generated smoke is passed into the dust removal system. In the technical solution of the method for achieving ultra-low emissions and reducing vanadium losses when smelting high-vanadium iron, the generated smoke is cooled and melted in the dust removal system, and the remaining flue gas after the cooling and melt treatment is discharged after dehydration, including: cooling the high-temperature smoke through the Qiuli wet dust removal method so that the smoke is dissolved in the circulating water; the flue gas that is not dissolved in the circulating water is dehydrated and discharged through the chimney.

[0013] In the technical solution of the method for achieving ultra-low emissions and reducing vanadium losses when smelting high-vanadium iron, the generated smoke is cooled and melted in the dust removal system, and the remaining flue gas after the cooling and melt treatment is discharged after dehydration, including: the generated smoke is cooled by the Qiuli wet dust removal to dissolve the smoke into circulating water; the flue gas that is not dissolved in the circulating water is dehydrated and then enters the bag dust collector to capture the dust again and then discharged through the chimney.

[0014] In the above-mentioned technical solution of the method for achieving ultra-low emissions and reducing vanadium losses when smelting high-vanadium iron, after the remaining flue gas after cooling and melt water treatment is discharged after dehydration treatment, the method also includes: passing the discharged flue gas into a detection system to detect the emission concentration of particulate matter PM10 in the flue gas.

[0015] In the above technical solution for achieving ultra-low emissions and reducing vanadium losses during the smelting of high-vanadium iron, it was detected that the PM10 emission concentration of the discharged particulate matter was <5 mg / m3, and the vanadium recovery rate was ≥98.3%.

[0016] The method for achieving ultra-low emissions and reducing vanadium loss during smelting of high-vanadium iron provided in the embodiments of the present disclosure can achieve the following technical effects: Using high calcium magnesium flake vanadium as raw material can increase the initial reaction temperature, and use the calcium oxide and magnesium oxide components in it to quickly form aluminates with the reduction products, thereby reducing the generation of alumina smoke during the smelting process; High calcium magnesium flake vanadium is used in ferrovanadium smelting, which not only reduces the concentration of discharged particulate matter, but also reduces the loss of vanadium in dust removal ash; The application of the composite dust removal system of Venturi wet dust removal + bag dust removal at the end in the ultra-low emission end-of-pipe treatment of ferrovanadium.

[0017] The above general description and the following description are exemplary and explanatory only and are not intended to limit the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] One or more embodiments are exemplarily described by corresponding drawings, which do not limit the embodiments. Elements with the same reference numerals in the drawings are shown as similar elements, and the drawings do not constitute a scale limitation, and wherein: Figure 1A schematic flow chart of a method for achieving ultra-low emissions and reducing vanadium loss during smelting of high-vanadium iron provided by the present invention is shown; Figure 2 A schematic diagram of a composite dust removal system provided by the present invention is shown.

[0019] Reference numerals: 1. Separation tank; 2. Circulating water pool; 3. Dehydration tank; 4. Bag dust collector. DETAILED DESCRIPTION

[0020] In order to be able to understand the features and technical contents of the embodiments of the present disclosure in more detail, the implementation of the embodiments of the present disclosure is described in detail below in conjunction with the accompanying drawings. The attached drawings are for reference only and are not used to limit the embodiments of the present disclosure. In the following technical description, for the convenience of explanation, a full understanding of the disclosed embodiments is provided through multiple details. However, one or more embodiments can still be implemented without these details. In other cases, to simplify the drawings, well-known structures and devices can be simplified for display.

[0021] The terms "first", "second", etc. in the specification and claims of the embodiments of the present disclosure and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchanged where appropriate, so that the embodiments of the embodiments of the present disclosure described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions.

[0022] In the embodiments of the present disclosure, the terms "upper", "lower", "inside", "middle", "outside", "front", "back" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. These terms are mainly intended to better describe the embodiments of the present disclosure and their embodiments, and are not intended to limit the indicated devices, elements or components to have a specific direction, or to be constructed and operated in a specific direction. Moreover, in addition to being used to indicate directions or positional relationships, some of the above terms may also be used to indicate other meanings. For example, the term "upper" may also be used to indicate a certain dependency or connection relationship in certain circumstances. For those of ordinary skill in the art, the specific meanings of these terms in the embodiments of the present disclosure can be understood according to specific circumstances.

[0023] In addition, the terms "disposed", "connected", and "fixed" should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present disclosure can be understood according to specific circumstances.

[0024] Unless otherwise stated, the term "plurality" means two or more.

[0025] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present disclosure may be combined with each other.

[0026] like Figure 1 As shown, an embodiment of the present disclosure provides a method for achieving ultra-low emissions and reducing vanadium loss when smelting high-vanadium iron, comprising: Step S1: high calcium magnesium vanadium pentoxide, vanadium pentoxide and aluminum products are mixed in proportion and added into an ironmaking furnace to form a prefabricated mixture, wherein, in terms of mass percentage, the V2O5 content of the high calcium magnesium vanadium pentoxide is ≥90%, and the CaO content + MgO content is ≥3%; Step S2: heating the prefabricated mixture in an ironmaking furnace to generate a high temperature reaction and passing smoke generated by the reaction into a dust removal system; Step S3: in the dust removal system, the generated smoke is cooled and melted by water, and the remaining smoke after the cooling and melting treatment is discharged after dehydration treatment.

[0027] Specifically, the present invention can use high-calcium-magnesium vanadium pentoxide to smelt high-vanadium iron. The calcium-containing component and the magnesium-containing component types in the high-calcium-magnesium vanadium flakes are calcium vanadate and magnesium vanadate, respectively, which can slow down the heat release rate of the aluminothermic reaction and reduce the amount of smoke generated during the reaction. At the same time, aluminate is formed with the aluminum oxide produced by the reaction of vanadium pentoxide and aluminum, which can promote the forward reaction and reduce the vanadium oxide content in the slag.

[0028] In the preferred technical solution of the present application, in the prefabricated mixture, the mass ratio of the high calcium magnesium vanadium pentoxide, the vanadium pentoxide and the aluminum product is: 0:4:2.

[0029] Specifically, the vanadium pentoxide may be conventional vanadium pentoxide instead of high calcium magnesium vanadium pentoxide. Thus, after high calcium magnesium vanadium pentoxide and vanadium pentoxide are mixed at a ratio of 0:4, normal reaction progress can be achieved by using only conventional vanadium pentoxide.

[0030] like Figure 1 As shown, in the preferred technical solution of the present application, in the prefabricated mixture, the mass ratio of the high calcium magnesium vanadium pentoxide, the vanadium pentoxide and the aluminum product is: 1:3:1.97-1:3:1.98.

[0031] Specifically, after high calcium magnesium vanadium pentoxide and vanadium pentoxide are mixed in a ratio of 1:3, one-quarter of the high calcium magnesium vanadium pentoxide provides magnesium vanadate and calcium vanadate, which can slow down the heat release rate of the thermite reaction and reduce the amount of smoke generated during the reaction. At the same time, three-quarters of the vanadium pentoxide reacts with aluminum to produce alumina to form aluminate, reducing the vanadium oxide content in the slag.

[0032] In the preferred technical solution of the present application, in the prefabricated mixture, the mass ratio of the high calcium magnesium vanadium pentoxide, the vanadium pentoxide and the aluminum product is: 4:1:2.4-4:1:2.42.

[0033] Specifically, after high calcium magnesium vanadium pentoxide is mixed with vanadium pentoxide in a ratio of 4:1, four-fifths of the high calcium magnesium vanadium pentoxide provides magnesium vanadate and calcium vanadate, which can slow down the heat release rate of the aluminothermic reaction and reduce the amount of smoke generated during the reaction. At the same time, one-fifth of the vanadium pentoxide reacts with aluminum to produce alumina to form aluminate, reducing the content of vanadium oxide in the slag. Moreover, the content of high calcium magnesium vanadium pentoxide is higher than that of conventional vanadium pentoxide, which can well control the intensity of the reaction and thus the amount of smoke during the reaction. Reduce the dust removal pressure of the subsequent dust removal system.

[0034] In the preferred technical solution of the present application, the V2O5 content in the high calcium magnesium vanadium pentoxide is ≥90%, and the CaO content + MgO content is ≥3%.

[0035] Specifically, the particle size of the high calcium magnesium vanadium flakes is less than 55*55*8mm, the V2O5 content is ≥90%, and the CaO content + MgO content is ≥3%, which is sufficient to slow down the heat release rate of the thermite reaction.

[0036] In the preferred technical solution of the present application, the prefabricated mixture is heated in the iron-making furnace to produce a high-temperature reaction and the smoke generated by the reaction is passed into the dust removal system, including: after the prefabricated mixture is added to the iron-making furnace, a self-propagating reaction is carried out by upper ignition and the generated smoke is passed into the dust removal system.

[0037] Specifically, high calcium magnesium vanadium pentoxide, vanadium pentoxide, aluminum products and other materials required for ironmaking are ignited in the upper part of the ironmaking furnace to carry out a self-propagating reaction. Although high calcium magnesium vanadium pentoxide is added, a certain amount of smoke and dust will still be generated, but the amount of smoke and dust is much less than that without adding. The smoke and dust generated is then guided into the dust removal system for dust removal.

[0038] In the preferred technical solution of the present application, the generated smoke dust is cooled and melted in the dust removal system, and the remaining flue gas after the cooling and melting treatment is discharged after dehydration, including: the generated smoke dust is cooled by the Qiuli wet dust removal to dissolve the high-temperature smoke dust into the circulating water; the flue gas that is not dissolved in the circulating water is dehydrated and discharged through the chimney.

[0039] Specifically, in this embodiment, the Venturi wet dust removal and dehydration method is used to remove the smoke dust. The Venturi wet dust removal mainly cools down the high-temperature smoke dust, captures part of the dust, and discharges the excess smoke dust after dehydration.

[0040] In the preferred technical solution of the present application, the generated smoke dust is cooled and melted in the dust removal system, and the remaining flue gas after the cooling and melting treatment is discharged after dehydration, including: the generated smoke dust is cooled by the Qiuli wet dust removal to dissolve the smoke dust into the circulating water; the flue gas that is not dissolved in the circulating water is dehydrated and then enters the bag dust collector to capture the dust again and then discharged through the chimney.

[0041] Specifically, in this embodiment, a composite dust removal system of Qiuli wet dust removal plus bag dust collector is used. Application in ultra-low emission terminal treatment of ferrovanadium. On the basis of wet dust removal, the dust removal effect is better through bag dust removal.

[0042] In the preferred technical solution of the present application, after the remaining flue gas after the cooling and melt water treatment is discharged after dehydration treatment, the method further includes: passing the discharged flue gas into a detection system to detect the PM10 emission concentration of particulate matter in the flue gas. Among them, the PM10 emission concentration of the discharged particulate matter is detected to be less than 5mg / m3, and the vanadium recovery rate is ≥98.3%.

[0043] Specifically, in order to verify whether the smoke is qualified after it is discharged, a detection system needs to be set up. The detection system can be, for example, a particle detection device. When the emission concentration of particulate matter PM10 in the smoke is lower than 6 mg / m3, it is a composite requirement.

[0044] In the preferred technical solution of the present application, the composite dust removal system includes a separation tank 1, a circulating water pool 2, a dehydration tank 3 and a bag dust collector 4. The separation tank 1 is connected to the circulating water pool 2, and the separation tank 1 is also connected to the dehydration tank 3 and the bag dust collector 4 in sequence. The circulating water enters the separation tank 1 from the circulating water pool 2, absorbs part of the flue gas in the separation tank 1 and is then discharged. The subsequent flue gas enters the dehydration tank 3 for dehydration and then enters the bag dust collector 4 for dust removal again and is discharged through the chimney.

[0045] The embodiments of the present disclosure are further described below with reference to specific embodiments.

[0046] Example 1 High calcium magnesium vanadium pentoxide and conventional vanadium pentoxide were selected and mixed in a ratio of 0:4:2.02. The upper ignition was carried out for self-propagating reaction. The reaction was violent, accompanied by strong splashing during the reaction, and a large amount of smoke was generated. The generated smoke was cooled by Qiuli wet dust removal to reduce the high-temperature smoke, and a large amount of dust was dissolved in the circulating water. The remaining flue gas was dehydrated and discharged through the chimney. The measured particulate matter PM10 emission concentration was 25mg / m3, and the flue gas temperature was 62℃. The quality of high vanadium iron after smelting met the requirements of "GB / T 4139-2012", the vanadium recovery rate was 98.5%, and the vanadium content in the final dust ash was 0.71%.

[0047] Example 2 High calcium magnesium vanadium pentoxide and conventional vanadium pentoxide were selected and mixed in a ratio of 0:4. The upper ignition was carried out for self-propagating reaction. The reaction was violent, accompanied by strong splashing during the reaction, and a large amount of smoke was generated. The generated smoke was cooled by Qiuli wet dust removal to cool the high-temperature smoke, and a large amount of dust was dissolved in the circulating water. The remaining flue gas was dehydrated and then entered the bag filter to capture the dust again and then discharged through the chimney. The measured particulate matter PM10 emission concentration was 15mg / m3, and the flue gas temperature was 41°C. The quality of high vanadium iron after smelting met the requirements of "GB / T 4139-2012", the vanadium recovery rate was 98.5%, and the vanadium content in the final dust ash was 0.78%.

[0048] Example 3 High calcium magnesium vanadium pentoxide and conventional vanadium pentoxide were selected in a ratio of 1:3 and ignited from the top for self-propagating reaction. The reaction was violent and accompanied by splashing, generating a large amount of smoke and dust. The generated smoke was cooled by the Qiuli wet dust removal method to reduce the temperature of the high-temperature smoke and a large amount of dust was dissolved in the circulating water. The remaining flue gas was dehydrated and then entered the bag filter to capture the dust again and then discharged through the chimney. The measured particulate matter PM10 emission concentration was 7 mg / m3 and the flue gas temperature was 43°C. The quality of high vanadium iron after smelting met the requirements of GB / T 4139-2012, the vanadium recovery rate was 98.39%, and the vanadium content in the final dust ash was 0.81%.

[0049] Example 4 High calcium magnesium vanadium pentoxide and conventional vanadium pentoxide were selected in a ratio of 4:0 and ignited from the top for self-propagating reaction. The reaction was stable, without splashing during the reaction process, and a small amount of smoke was generated. The generated smoke was cooled by the Qiuli wet dust removal method to cool the high-temperature smoke, and a large amount of dust was dissolved in the circulating water. The remaining flue gas was dehydrated and then entered the bag filter to capture the dust again and then discharged through the chimney. The measured particulate matter PM10 emission concentration was 2 mg / m3, and the flue gas temperature was 38°C. The quality of high vanadium iron after smelting met the requirements of GB / T 4139-2012, the vanadium recovery rate was 98.31%, and the vanadium content in the final dust ash was 0.82%.

[0050] Comparative Example 1 100% conventional vanadium pentoxide was selected and proportioned according to the FeV80 proportioning requirements. The upper ignition was carried out for self-propagating reaction. The reaction was stable, and the reaction process was violently splashed, generating a large amount of smoke and dust. The generated smoke and dust were cooled by the Qiuli wet dust removal method to cool the high-temperature smoke and dust, and a large amount of dust was dissolved in the circulating water. The remaining flue gas was dehydrated and then entered the bag filter to capture the dust again and then discharged through the chimney. The measured particulate matter emission PM10 concentration was 22mg / m3, and the flue gas temperature was 48℃. The quality of high vanadium iron after smelting met the requirements of GB / T 4139-2012. The vanadium recovery rate after smelting was 97.31%, and the vanadium content in the final dust ash was 6.82%.

[0051] Comparative Example 2 100% conventional vanadium pentoxide was selected and proportioned according to the FeV80 proportioning requirements. The upper ignition was carried out for self-propagating reaction. The reaction was stable, and the reaction process splashed violently, generating a large amount of smoke. The generated smoke was collected again by the bag filter and then discharged through the chimney. The measured particulate matter PM10 emission concentration was 42 mg / m3, and the flue gas temperature was 88 °C. The quality of high vanadium iron after smelting met the requirements of GB / T 4139-2012. The vanadium recovery rate was 97.01% after smelting, and the vanadium content in the final dust ash was 6.92%.

[0052] It can be seen from the above embodiments and comparative examples that the use of high-calcium magnesium flake vanadium as raw material can increase the initial reaction temperature, utilize the calcium oxide and magnesium oxide components therein to quickly form aluminates with the reduction product, and reduce the generation of alumina smoke during the smelting process; the use of high-calcium magnesium flake vanadium for ferrovanadium smelting not only reduces the concentration of discharged particulate matter, but also reduces the loss of vanadium in the dust removal ash; the application of a composite dust removal system with Venturi wet dust removal + bag dust removal at the end in the ultra-low emission terminal treatment of ferrovanadium.

[0053] The above description and the accompanying drawings sufficiently illustrate the embodiments of the present disclosure to enable those skilled in the art to practice them. Other embodiments may include structural and other changes. The embodiments represent only possible variations. Unless explicitly required, individual components and functions are optional, and the order of operations may vary. Portions and features of some embodiments may be included in or replace portions and features of other embodiments. The embodiments of the present disclosure are not limited to the structures described above and shown in the accompanying drawings, and various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A method for achieving ultra-low emissions and reducing vanadium losses when smelting high-vanadium iron, characterized in that: The following steps are involved: The high calcium magnesium vanadium pentoxide, vanadium pentoxide and aluminum products are mixed in proportion and added into an ironmaking furnace to form a prefabricated mixture, wherein, by mass percentage, the V2O5 content of the high calcium magnesium vanadium pentoxide is ≥90%, and the CaO content + MgO content is ≥3%; The prefabricated mixture is heated in an ironmaking furnace to generate a high temperature reaction and the smoke generated by the reaction is introduced into a dust removal system; In the dust removal system, the generated smoke dust is cooled and melted with water, and the remaining smoke after the cooling and melting treatment is discharged after dehydration.

2. The method according to claim 1, characterized in that In the prefabricated mixture, the mass ratio of the high calcium magnesium vanadium pentoxide, the vanadium pentoxide and the aluminum product is 0:4:

2.

3. The method according to claim 1, characterized in that In the prefabricated mixture, the mass ratio of the high calcium magnesium vanadium pentoxide, the vanadium pentoxide and the aluminum product is: 1:3:1.97-1:3:1.

98.

4. The method according to claim 1, characterized in that: In the prefabricated mixture, the mass ratio of the high calcium magnesium vanadium pentoxide, the vanadium pentoxide and the aluminum product is: 4:1:2.4-4:1:2.

42.

5. In the prefabricated mixture, the mass ratio of the high calcium magnesium vanadium pentoxide, the vanadium pentoxide and the aluminum product is: 1:4:2.47-1:4:2.

48.

6. The method according to any one of claims 2 to 5, characterized in that: The method of heating the prefabricated mixture in the ironmaking furnace to generate a high temperature reaction and introducing the smoke generated by the reaction into the dust removal system comprises: After the prefabricated mixture is added into the ironmaking furnace, a self-propagating reaction is carried out by top ignition and the generated smoke is introduced into the dust removal system.

7. The method according to claim 6, characterized in that The method of cooling and melting the generated smoke in the dust removal system and discharging the remaining smoke after the cooling and melting treatment through dehydration treatment comprises: The generated smoke is cooled by the Qiuli wet dust removal method to dissolve the high-temperature smoke into the circulating water; The flue gas that is not dissolved in the circulating water is dehydrated and discharged through the chimney.

8. The method according to claim 6, characterized in that In the dust removal system, the generated smoke dust is cooled and melted with water, and the remaining smoke after the cooling and melting treatment is discharged after dehydration treatment, including: The generated smoke is cooled by the Qiuli wet dust removal method to dissolve the high-temperature smoke into the circulating water; The flue gas that is not dissolved in the circulating water is dehydrated and then enters the bag filter to capture the dust again and then discharged through the chimney.

9. The method according to claim 7 or 8, characterized in that: After the remaining flue gas after the cooling and melting water treatment is discharged after dehydration treatment, the method further comprises: The exhaust flue gas is passed into the detection system to detect the emission concentration of particulate matter PM10 in the flue gas.

10. The method according to claim 9, characterized in that The emission concentration of PM10 particles discharged was tested to be less than 5mg / m3, and the vanadium recovery rate was ≥98.3%.

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