Vanadium-extracting and slag-adjusting method for vanadium-containing high-silicon molten iron

Abstract

The invention relates to a method for extracting vanadium and adjusting slag from vanadium-containing high-silicon molten iron. The method comprises the following steps: determining the dosage of a slag adjusting agent based on the silicon content in the vanadium-containing high-silicon molten iron; in the process of extracting vanadium from the vanadium-containing high-silicon molten iron through converter oxygen blowing, a determined amount of slag modifier is added for slag conditioning treatment. According to the method, a certain amount of slag modifier is added in the vanadium-containing high-silicon molten iron converter vanadium extraction according to the silicon content, so that the melting point of the vanadium slag can be changed, the viscosity of the vanadium slag is increased, the terminal vanadium content is reduced, the vanadium slag loss is reduced, and the vanadium oxidation rate and the vanadium recovery rate are improved.

Description

Technical Field

[0001] The invention belongs to the field of steel smelting, and more specifically, relates to a method for extracting vanadium and adjusting slag from vanadium-containing high-silicon molten iron. Background Art

[0002] The process of extracting vanadium from hot metal is an oxidation reaction process of iron, vanadium, carbon, silicon, manganese, titanium, phosphorus, sulfur and other elements in hot metal. The speed of the oxidation reaction of these elements depends on the chemical composition of the hot metal itself, the thermodynamic and kinetic conditions when blowing vanadium. The oxidation ability of each element is as follows from large to small: silicon → titanium → manganese → vanadium → chromium. The affinity of silicon to oxygen is stronger than that of vanadium to oxygen. When the silicon content of hot metal is high, the oxidation of vanadium will be inhibited, the terminal vanadium is high, and the vanadium oxidation rate decreases. The silicon in the hot metal is oxidized to generate SiO2. The SiO2 in the primary slag reacts with FeO, MnO, etc. to generate low-melting silicate phases such as fayalite, thereby reducing the melting point of the vanadium slag, reducing the viscosity of the vanadium slag, increasing the fluidity, and the slag coagulation effect. The loss of vanadium slag during steelmaking is large, and the vanadium recovery rate decreases.

[0003] At present, in order to overcome the difficulties in the process of extracting vanadium from high-silicon hot metal and improve the recovery rate of vanadium, a variety of slag adjustment methods are used: (1) Control silicon content: By adjusting the composition of molten iron, the silicon content can be controlled within an appropriate range. This can ensure that the oxidation of silicon does not excessively inhibit the oxidation of vanadium, and can also avoid incomplete blowing reaction and reduced oxidation rate caused by too low silicon content.

[0004] (2) Adding coolant: During the vanadium extraction process, coolant (such as scrap steel, iron ore, etc.) is added to control the molten pool temperature below the carbon-vanadium conversion temperature. This is conducive to achieving the purpose of "vanadium extraction and carbon preservation", that is, vanadium is preferentially oxidized while carbon is retained as much as possible.

[0005] (3) Adopting the combined blowing process: The combined blowing process includes top blowing of oxygen and bottom blowing of inert gas. Bottom gas supply can effectively adjust the oxidation degree of metal and vanadium slag and accelerate the oxidation reaction of vanadium. At the same time, the combined blowing process can also increase the reaction interface and accelerate the mass transfer rate, further improving the oxidation rate and recovery rate of vanadium.

[0006] However, although the above methods have improved the recovery rate and oxidation rate of vanadium to a certain extent and have achieved certain results, the recovery rate and oxidation rate of vanadium still need to be further improved. In particular, there is no relevant literature on how to improve the vanadium extraction process by using the silicon content in high-silicon molten iron.

[0007] Therefore, the existing technology needs to be improved, and it is urgent to design a method for extracting vanadium from vanadium-containing high-silicon molten iron and adjusting slag based on the silicon content in the high-silicon molten iron. Summary of the invention

[0008] The purpose of the present invention is to provide a method for vanadium extraction and slag adjustment from vanadium-containing high-silicon hot metal. The method is a process for vanadium slag adjustment for vanadium extraction from vanadium-containing high-silicon hot metal in a top and bottom double-blown converter. The vanadium-containing high-silicon hot metal is subjected to converter oxygen blowing to extract vanadium. During the process, a certain amount of slag adjustment agent is added, other coolants are operated according to current operations, and the terminal temperature is controlled according to current requirements to reduce the terminal vanadium content and increase the viscosity of the vanadium slag. At the same time, in order to ensure that the CaO content in the vanadium slag meets the national standard requirements (vanadium slag YB / T 008-2006), the high-silicon slag adjustment furnace is not slaged, and the slag is removed after 2-3 furnaces of vanadium extraction from vanadium-containing hot metal.

[0009] In order to solve the above technical problems or achieve the above objectives, the present invention adopts the following technical solutions, which are specifically described as follows: According to aspects of the present invention, a method for extracting vanadium from vanadium-containing high-silicon molten iron and adjusting slag is provided, comprising the following steps: 1) Determine the amount of slag conditioning agent based on the silicon content in vanadium-containing high-silicon hot metal; 2) During the process of extracting vanadium from vanadium-containing high-silicon molten iron through oxygen blowing in a converter, a determined amount of slag conditioning agent is added for slag conditioning treatment.

[0010] In one embodiment of the present invention, the slag adjusting agent is composed of the following components in weight percentage: 0<CaO≤30%; MgO≥25%; 0<P≤0.01%; 0<S≤0.01%.

[0011] In one embodiment of the present invention, the particle size of the slag conditioning agent is 10-70 mm.

[0012] In one embodiment of the present invention, step 1) further comprises: If 0≤silicon content<0.20%, no slag conditioning agent is added; If the silicon content is 0.20%≤<0.25%, the dosage of slag conditioning agent is 300-400 kg / furnace; If the silicon content is 0.25%≤<0.30%, the dosage of slag conditioning agent is 400-600 kg / furnace; If the silicon content is 0.30%≤<0.40%, the dosage of slag adjusting agent is 600-800 kg / furnace; If the silicon content is ≥0.40%, the silicon content in the vanadium-containing high-silicon molten iron is reduced to a silicon content of <0.40%, and then the amount of slag adjusting agent is determined.

[0013] In one embodiment of the present invention, if the silicon content is ≥0.40%, vanadium-containing high-silicon molten iron is mixed with low-silicon molten iron to make the silicon content <0.40%, and then the amount of slag adjusting agent is determined.

[0014] In one embodiment of the present invention, in step 2), the slag conditioning agent is accurately weighed in the furnace top silo and then added into the furnace.

[0015] In one embodiment of the present invention, in step 2), a coolant is added during the process of extracting vanadium from vanadium-containing high-silicon molten iron by oxygen blowing in a converter.

[0016] In one embodiment of the present invention, in step 2), the slag conditioning agent and the coolant are added within 0-3 minutes of oxygen blowing.

[0017] In one embodiment of the present invention, the method further comprises the steps of: 3) The slag is not dumped in the slag adjustment furnace, and vanadium extraction from vanadium-containing molten iron is continued for 2-3 furnaces before slag dumping.

[0018] In one embodiment of the present invention, the converter oxygen blowing to extract vanadium is a top and bottom combined blowing converter.

[0019] By adopting the above technical solution, the present invention has the following advantages compared with the prior art: The present invention adds a certain amount of slag adjusting agent according to the silicon content in the vanadium-containing high-silicon molten iron converter to change the melting point of the vanadium slag, increase the viscosity of the vanadium slag, reduce the terminal vanadium content, reduce the loss of vanadium slag, and improve the vanadium oxidation rate and vanadium recovery rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other embodiments can be obtained based on these drawings without paying creative work.

[0021] The above and / or additional aspects and advantages of the present invention will be more apparent and easily understood in the description of the embodiments in conjunction with the accompanying drawings, in which: Figure 1 The present invention shows a flow chart of a method for extracting vanadium from vanadium-containing high-silicon molten iron and adjusting slag. DETAILED DESCRIPTION

[0022] It should be understood that the embodiments of the present invention shown in the exemplary embodiments are only illustrative. Although only a few embodiments are described in detail in the present invention, it is easy for those skilled in the art to appreciate that multiple modifications are feasible without actually departing from the teaching of the subject matter of the present invention. Accordingly, all such modifications should be included within the scope of the present invention. Without departing from the gist of the present invention, other replacements, modifications, changes and deletions may be made to the design, operating conditions and parameters of the following exemplary embodiments.

[0023] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the embodiments of the present invention are further described in detail below in combination with specific embodiments and with reference to the accompanying drawings.

[0024] Figure 1 The flowchart of the method for extracting vanadium from molten iron containing vanadium and high silicon provided by the present invention is shown. Figure 1 As shown, the present invention provides a method for extracting vanadium from molten iron containing vanadium and high silicon, and adjusting slag, comprising the following steps: S101: Determine the amount of slag conditioning agent based on the silicon content in the vanadium-containing high-silicon hot metal; S102: During the process of extracting vanadium from vanadium-containing high-silicon molten iron by oxygen blowing in a converter, a slag conditioning agent in a determined amount is added to perform slag conditioning treatment.

[0025] The present invention adds a certain amount of slag adjusting agent according to the silicon content in the vanadium-containing high-silicon molten iron converter to change the melting point of the vanadium slag, increase the viscosity of the vanadium slag, reduce the terminal vanadium content, reduce the loss of vanadium slag, and improve the vanadium oxidation rate and vanadium recovery rate.

[0026] In the above-mentioned method for extracting vanadium from vanadium-containing high-silicon molten iron and adjusting slag, the slag adjusting agent is composed of the following components in weight percentage: 0<CaO≤30%; MgO≥25%; 0<P≤0.01%; 0<S≤0.01%.

[0027] In the above-mentioned method for extracting vanadium from vanadium-containing high-silicon molten iron and adjusting slag, the particle size of the slag adjusting agent is 10-70 mm.

[0028] In the above method for extracting vanadium from vanadium-containing high-silicon molten iron and adjusting slag, step S101 further comprises: If 0≤silicon content<0.20%, no slag conditioning agent is added; If the silicon content is 0.20%≤<0.25%, the dosage of slag conditioning agent is 300-400 kg / furnace; If the silicon content is 0.25%≤<0.30%, the dosage of slag conditioning agent is 400-600 kg / furnace; If the silicon content is 0.30%≤<0.40%, the dosage of slag adjusting agent is 600-800 kg / furnace; If the silicon content is ≥0.40%, the silicon content in the vanadium-containing high-silicon molten iron is reduced to a silicon content of <0.40%, and then the amount of slag adjusting agent is determined.

[0029] In the above method for extracting vanadium and adjusting slag from vanadium-containing high-silicon molten iron, if the silicon content is ≥0.40%, the vanadium-containing high-silicon molten iron is mixed with low-silicon molten iron to make the silicon content <0.40%, and then the amount of slag adjusting agent is determined.

[0030] In the above method for extracting vanadium from vanadium-containing high-silicon hot metal and adjusting slag, in step S102, the slag adjusting agent is accurately weighed in the furnace top silo and then added into the furnace.

[0031] In the above method for extracting vanadium from vanadium-containing high-silicon hot metal and adjusting slag, in step S102, a coolant is added during the process of extracting vanadium from the vanadium-containing high-silicon hot metal through converter oxygen blowing.

[0032] In the above method for extracting vanadium from vanadium-containing high-silicon molten iron and adjusting slag, in step S103, the slag adjusting agent and the coolant are added within 0-3 minutes of oxygen blowing.

[0033] In the above method for extracting vanadium from vanadium-containing high-silicon molten iron and adjusting slag, the method further comprises the steps of: The slag is not dumped in the slag-adjusting furnace, and vanadium extraction from vanadium-containing molten iron is continued for 2-3 furnaces before slag dumping.

[0034] In the above method for extracting vanadium from vanadium-containing high-silicon molten iron and adjusting slag, the converter oxygen blowing to extract vanadium is a top and bottom double-blown converter.

[0035] The above technical solution of the present invention is described and explained in detail below through specific embodiments.

[0036] In the embodiment of the present invention, vanadium is extracted from molten iron containing vanadium and high silicon by oxygen blowing in a converter, and a certain amount of slag conditioning agent is added during the process, so that the viscosity of the vanadium slag is increased, which has a good slag coagulation effect.

[0037] The physical and chemical index requirements of slag conditioning agent are: the weight percentage of CaO is not more than 30%, the weight percentage of MgO is not less than 25%, the weight percentage of P is not more than 0.01%, the weight percentage of S is not more than 0.01%, and the particle size is 10-70mm.

[0038] The technical solution of the embodiment of the present invention is specifically described as follows: A method for extracting vanadium from vanadium-containing high-silicon molten iron and adjusting slag, the specific steps are as follows: (1) The dosage of slag conditioning agent is determined based on the silicon content in the vanadium-containing high-silicon molten iron.

[0039] In step (1), the amount of alkaline flux added is: When the silicon content in the molten iron is 0≤<0.20%, it is low-silicon molten iron and no slag adjusting agent is added; when the silicon content in the molten iron is 0.20%≤<0.25%, the amount of slag adjusting agent added is 300-400 kg / furnace; when the silicon content in the molten iron is 0.25%≤<0.30%, the amount of slag adjusting agent added is 400-600 kg / furnace; when the silicon content in the molten iron is 0.30%≤<0.40%, the amount of slag adjusting agent added is 600-800 kg / furnace; when the silicon content in the molten iron is ≥0.40%, vanadium cannot be extracted directly and it needs to be mixed with low-silicon molten iron to make the silicon content <0.40%, and then the amount of slag adjusting agent added is determined according to the above content range.

[0040] (2) During the process of extracting vanadium from vanadium-containing high-silicon molten iron by oxygen blowing in a converter, a slag conditioning agent in a certain amount is added for slag conditioning treatment.

[0041] In step (2), the slag adjusting agent is added in the furnace after being accurately weighed in the furnace top silo. Coolant is also added during the process of vanadium extraction from vanadium-containing high-silicon molten iron by oxygen blowing in the converter. Slag adjusting agent is added at the same time as the coolant, and the coolant is operated according to the current operation. The terminal temperature is controlled according to the current requirements.

[0042] (3) The slag is not dumped in the slag adjustment furnace, and vanadium extraction from vanadium-containing molten iron is continued for 2-3 furnaces before slag dumping.

[0043] Example 1 The 4# vanadium-extracting converter of the vanadium-extracting steel plant has a molten iron volume of 138.3 tons, a Si content of 0.32%, a V content of 0.31%, a molten iron temperature of 1302℃, a coolant of 37.2 kg / ton iron, a slag-adjusting agent of 620 kg, pure oxygen blowing for 5.1 minutes, a terminal temperature of 1402℃, a terminal vanadium of 0.033%, and a thick vanadium slag. During the steel-making process, the slag is lifted and the half steel is basically discharged, and the vanadium slag is basically not lost. The slag is not discharged in this furnace. After 3 furnaces, the vanadium slag furnace sample composition is as follows: CaO: 2.47%; V2O5: 15.2%; TFe: 29.3%; P: 0.043%; SiO2: 15.4%.

[0044] Example 2 The 4# vanadium-extracting converter of the vanadium-extracting steel plant has a molten iron volume of 134 tons, a Si content of 0.20%, a V content of 0.31%, a molten iron temperature of 1324℃, 6 tons of vanadium-containing pig iron blocks, 30.5 kg / ton iron of coolant, 308 kg of slag-adjusting agent, pure oxygen blowing for 5.4 minutes, a terminal temperature of 1386℃, a terminal vanadium of 0.027%, and a thick vanadium slag. During the steel-making process, the slag is lifted and the half steel is basically discharged, and the vanadium slag is basically not lost. The slag is not discharged in this furnace. After 3 furnaces, the vanadium slag furnace sample composition is as follows: CaO: 1.85%; V2O5: 15.8%; TFe: 29.3%; P: 0.035%; SiO2: 13.5%.

[0045] Example 3 The 4# vanadium-extracting converter of the vanadium-extracting steel plant has a molten iron volume of 140.3 tons, a Si content of 0.22%, a V content of 0.34%, a molten iron temperature of 1308°C, a coolant of 39.2 kg / ton iron, a slag regulator of 315 kg, pure oxygen blowing for 5.6 minutes, a terminal temperature of 1394°C, a terminal vanadium of 0.028%, and a thick vanadium slag. During the steel-making process, the slag is lifted and the half steel is basically discharged, and the vanadium slag is basically not lost. The slag is not discharged in this furnace. The composition of the vanadium slag furnace sample after the slag is discharged after 2 furnaces is as follows: CaO: 2.31%; V2O5: 16.2%; TFe: 29.8%; P: 0.045%; SiO2: 14.2%.

[0046] Example 4 The 4# vanadium-extracting converter of the vanadium-extracting steel plant has a molten iron volume of 136.3 tons, a Si content of 0.25%, a V content of 0.32%, a molten iron temperature of 1262°C, a coolant of 34.5 kg / ton iron, a slag-adjusting agent of 515 kg, pure oxygen blowing for 6.0 minutes, a terminal temperature of 1370°C, a terminal vanadium of 0.027%, and a thick vanadium slag. During the steel-making process, the slag is lifted and the half steel is basically discharged, and the vanadium slag is basically not lost. The slag is not discharged in this furnace. The composition of the vanadium slag furnace sample after the slag is discharged after 2 furnaces is as follows: CaO: 2.40%; V2O5: 15.7%; TFe: 29.7%; P: 0.042%; SiO2: 14.8%.

[0047] Example 5 The 4# vanadium-extracting converter of the vanadium-extracting steel plant has a molten iron volume of 138.6 tons, a Si content of 0.28%, a V content of 0.31%, a molten iron temperature of 1267℃, 6 tons of pig iron, 37.3 kg / ton of iron coolant, 580 kg of slag regulator, 6.6 minutes of pure oxygen blowing, a terminal temperature of 1396℃, a terminal vanadium of 0.025%, and a thick vanadium slag. During the steel-making process, the slag is lifted and the half steel is basically discharged, and the vanadium slag is basically not lost. The slag is not discharged in this furnace. The composition of the vanadium slag furnace sample after the slag is discharged after 2 furnaces is as follows: CaO: 2.35%; V2O5: 15.2%; TFe: 30.4%; P: 0.038%; SiO2: 14.9%.

[0048] Example 6 The 4# vanadium-extracting converter of the vanadium-extracting steel plant has a molten iron volume of 130.5 tons, a Si content of 0.30%, a V content of 0.307%, a molten iron temperature of 1282℃, 5 tons of pig iron, 28.6 kg / ton of iron coolant, 620 kg of slag-adjusting agent, pure oxygen blowing for 5.8 minutes, a terminal temperature of 1402℃, a terminal vanadium of 0.033%, and a thick vanadium slag. During the steel-making process, the slag is lifted and the half steel is basically discharged, and the vanadium slag is basically not lost. The slag is not discharged in this furnace. The composition of the vanadium slag furnace sample after the slag is discharged after 2 furnaces is as follows: CaO: 2.48%; V2O5: 14.6%; TFe: 29.5%; P: 0.035%; SiO2: 15.3%.

[0049] Example 7 The 4# vanadium-extracting converter of the vanadium-extracting steel plant has a molten iron volume of 139.5 tons, a Si content of 0.35%, a V content of 0.30%, a molten iron temperature of 1273℃, 7 tons of pig iron, 32.0 kg / ton of coolant, 720 kg of slag-adjusting agent, pure oxygen blowing for 5.4 minutes, a terminal temperature of 1392℃, a terminal vanadium of 0.035%, and a thick vanadium slag. During the steel-making process, the slag is lifted and the half steel is basically discharged, and the vanadium slag is basically not lost. The slag is not discharged in this furnace. The composition of the vanadium slag furnace sample after the slag is discharged after 2 furnaces is as follows: CaO: 2.51%; V2O5: 14.0%; TFe: 30.1%; P: 0.040%; SiO2: 15.8%.

[0050] Example 8 The 4# vanadium-extracting converter of the vanadium-extracting steel plant has a molten iron volume of 140.2 tons, and the Si content in the molten iron is 0.44%, and the V content is 0.32%. At this time, vanadium cannot be directly extracted. The above molten iron is mixed with molten iron with a silicon content of 0.12%, and the Si content of the mixed molten iron is 0.31%, and the V content is 0.31%. The molten iron temperature is 1282℃, and 6 tons of pig iron blocks are added, and 30 kg / ton of coolant is added. Add 630 kg of slag regulator, add pure oxygen for 5.7 minutes, the terminal temperature is 1400℃, and the terminal vanadium is 0.032%. The vanadium slag is thick. During the steel-making process, the slag is lifted and the half steel is basically discharged, and the vanadium slag is basically not lost. The slag is not discharged in this furnace. The composition of the vanadium slag furnace sample after 2 furnaces is as follows: CaO: 2.46%; V2O5: 14.5%; TFe: 29.7%; P: 0.041%; SiO2: 15.1%.

[0051] Comparative Example The vanadium-extracting converter No. 4 of the vanadium-extracting steel plant has a molten iron volume of 138.0 tons, a Si content of 0.30%, a V content of 0.302%, a molten iron temperature of 1298℃, a coolant of 35.6 kg / ton iron, pure oxygen blowing for 4.6 minutes, a final temperature of 1410℃, and a final vanadium content of 0.044%. The vanadium slag in the furnace is thin and has a low viscosity. During the steel-making process, the slag is seen lifting the furnace, and there is still about 0.8 tons of semi-steel in the furnace that cannot be fully discharged; if the semi-steel is fully discharged, about 900 kg of vanadium slag will be lost into the semi-steel tank.

[0052] It can be seen from the above Examples 1-8 and the comparative example that the present invention adds a certain amount of slag adjusting agent according to the silicon content in the vanadium extraction of vanadium from vanadium-containing high-silicon molten iron converter, which can change the melting point of vanadium slag, increase the viscosity of vanadium slag, reduce the terminal vanadium content, reduce the loss of vanadium slag, and improve the vanadium oxidation rate and vanadium recovery rate.

[0053] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusions, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to the process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "including a..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0054] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0055] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A method for extracting vanadium from vanadium-containing high-silicon hot metal and adjusting slag, characterized in that: The following steps are involved: 1) Determine the amount of slag conditioning agent based on the silicon content in vanadium-containing high-silicon hot metal; 2) During the process of extracting vanadium from vanadium-containing high-silicon molten iron through oxygen blowing in a converter, a determined amount of slag conditioning agent is added for slag conditioning treatment.

2. The method for extracting vanadium from vanadium-containing high-silicon hot metal according to claim 1, characterized in that: The slag adjusting agent is composed of the following components in weight percentage: 0<CaO≤30%; MgO≥25%; 0<P≤0.01%; 0<S≤0.01%.

3. The method for extracting vanadium from vanadium-containing high-silicon hot metal according to claim 2, characterized in that: The particle size of the slag conditioning agent is 10-70 mm.

4. The method for extracting vanadium from vanadium-containing high-silicon hot metal according to claim 1, characterized in that: Step 1) further includes: If 0≤silicon content<0.20%, no slag conditioning agent is added; If the silicon content is 0.20%≤<0.25%, the dosage of slag conditioning agent is 300-400 kg / furnace; If the silicon content is 0.25%≤<0.30%, the dosage of slag conditioning agent is 400-600 kg / furnace; If the silicon content is 0.30%≤<0.40%, the dosage of slag adjusting agent is 600-800 kg / furnace; If the silicon content is ≥0.40%, the silicon content in the vanadium-containing high-silicon molten iron is reduced to a silicon content of <0.40%, and then the amount of slag adjusting agent is determined.

5. The method for extracting vanadium from vanadium-containing high-silicon hot metal according to claim 4, characterized in that: If the silicon content is ≥0.40%, mix the vanadium-containing high-silicon molten iron with the low-silicon molten iron to make the silicon content <0.40%, and then determine the amount of slag adjusting agent.

6. The method for extracting vanadium from vanadium-containing high-silicon hot metal according to claim 1, characterized in that: In step 2), the slag conditioning agent is accurately weighed in the furnace top silo and then added into the furnace.

7. The method for extracting vanadium from vanadium-containing high-silicon hot metal according to claim 1, characterized in that: In step 2), a coolant is added during the process of extracting vanadium from vanadium-containing high-silicon molten iron by oxygen blowing in a converter.

8. The method for extracting vanadium from vanadium-containing high-silicon hot metal according to claim 7, characterized in that: In step 2), the slag conditioning agent and the coolant are added within 0-3 minutes of oxygen blowing.

9. The method for extracting vanadium from vanadium-containing high-silicon hot metal according to claim 1, characterized in that: The method further comprises the steps of: 3) The slag is not dumped in the slag adjustment furnace, and vanadium extraction from vanadium-containing molten iron is continued for 2-3 furnaces before slag dumping.

10. The method for extracting vanadium from vanadium-containing high-silicon hot metal according to claim 1, characterized in that: The converter oxygen blowing method for vanadium extraction is a top and bottom blown converter.

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