A smelting method of vanadium titano-magnetite

Abstract

The application discloses a smelting method of vanadium-titanium magnetite, belongs to the technical field of comprehensive utilization of vanadium-titanium magnetite, and solves the problems of low iron utilization value, low vanadium recovery rate and difficulty in recovery and utilization of titanium in the prior art. The method comprises the following steps: vertical furnace gas-based direct reduction of vanadium-titanium magnetite oxidized pellets and reducing gas to obtain metallized pellets; the metallized pellets are loaded into an electric furnace, one-time melting separation is carried out under the condition that no reducing agent is added, low-carbon molten steel and iron-vanadium-titanium slag are generated; the iron-vanadium-titanium slag is mixed with coke and loaded into the electric furnace, secondary melting separation is carried out, and silicon-vanadium alloy and titanium-rich slag are generated. The application can be used for smelting of vanadium-titanium magnetite.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of comprehensive utilization of vanadium-titanium magnetite, and particularly relates to a smelting method of vanadium-titanium magnetite. BACKGROUND

[0002] Vanadium-titanium magnetite is a typical polymetallic co-associated ore, and vanadium and titanium are important strategic resources. The content of TFe in ordinary vanadium-titanium magnetite is 55% to 58%, the content of TiO2 is 7% to 13%, and the content of V2O5 is about 0.6%.

[0003] At present, for the comprehensive utilization of vanadium-titanium magnetite, a method of preparing vanadium-containing molten iron by adopting gas-based shaft furnace pre-reduction and electric furnace deep melting separation is usually adopted. The vanadium-containing molten iron is blown with oxygen in a vanadium extraction converter, V is oxidized to V2O5 to form vanadium slag, then the vanadium slag is used to produce vanadium sheet, and the molten iron is used for steelmaking. However, the utilization value of iron in the above method is low, which leads to low utilization value of iron, low vanadium recovery rate and difficulty in recycling and utilizing titanium in vanadium-titanium magnetite. SUMMARY

[0004] In view of the above analysis, the present application aims to provide a smelting method of vanadium-titanium magnetite, which solves the problems of low utilization value of iron, low vanadium recovery rate and difficulty in recycling and utilizing titanium in vanadium-titanium magnetite in the prior art.

[0005] The purpose of the present application is mainly achieved through the following technical solutions.

[0006] The present application provides a smelting method of vanadium-titanium magnetite, comprising the following steps:

[0007] Step I: vanadium-titanium magnetite oxidized pellets are subjected to shaft furnace gas-based direct reduction with reducing gas to obtain metallized pellets;

[0008] Step II: the metallized pellets are loaded into an electric furnace, and under the condition of not adding reducing agent, one-time melting separation is performed to generate low-carbon molten iron and iron-vanadium-titanium slag;

[0009] Step III: the iron-vanadium-titanium slag is mixed with coke and loaded into the electric furnace for two-time melting separation reduction to generate silicon-vanadium alloy and titanium-rich slag.

[0010] Further, in step I, the shaft furnace gas-based direct reduction is performed under the condition that the gas-solid ratio is 1.2 to 1.6 m 3 / kg.

[0011] Further, in step II, the metallized pellets are directly hot-loaded into the electric furnace.

[0012] Further, in step II, the hot-loading temperature of the metallized pellets is 700 to 900℃.

[0013] Further, in step II, the temperature of the separation is 1550-1650℃.

[0014] Further, in step II, the time of the separation is 30-90min.

[0015] Further, in the first separation process, the low-carbon molten iron and the iron-vanadium-titanium slag are separated by density difference.

[0016] Further, in step III, the amount of the coke added is 15-25% of the mass of the iron-vanadium-titanium slag.

[0017] Further, in step III, the temperature of the second separation is 1600-1800℃.

[0018] Further, in step III, the time of the second separation is 60-120min.

[0019] Compared with the prior art, the present application can achieve at least one of the following beneficial effects.

[0020] A) The present application provides a smelting method of vanadium-titanium magnetite, which adopts a method of vertical furnace gas-based direct reduction, first separation and second separation of vanadium-titanium magnetite, and can realize the step-by-step recovery of iron, vanadium and titanium resources in vanadium-titanium magnetite, and the preparation of low-carbon molten iron and silicon-vanadium alloy, respectively. The low-carbon molten iron is used for producing ultra-pure steel, and the high-value utilization of iron, vanadium and titanium in vanadium-titanium magnetite is realized.

[0021] B) The present application provides a smelting method of vanadium-titanium magnetite, which heats and loads the metallized pellets into an electric furnace. The heating and loading of the metallized pellets can not only reduce the power consumption of the electric furnace separation, but also avoid the carburization of the metallized pellets in the cooling process, which is conducive to obtaining molten steel with very low carbon content.

[0022] C) The present application provides a smelting method of vanadium-titanium magnetite, in which the iron oxide in the vanadium-titanium magnetite is reduced to iron in the first separation, and the impurity content in the generated iron is low, which can be used to prepare other ultra-pure steel. This is because, on the one hand, SiO2, MnO and vanadium oxide cannot be reduced by CO and cannot enter the iron, remaining in the slag; on the other hand, CO is difficult to react with metallic iron to generate Fe3C, so that the carburization amount of the metallized pellets is small.

[0023] D) The present application provides a smelting method of vanadium-titanium magnetite, in which the iron-vanadium-titanium slag is added with coke for secondary deep reduction in the second separation. According to the principle of selective reduction, the iron oxide, vanadium oxide and part of the silicon dioxide in the slag are reduced into the alloy, so as to obtain silicon-vanadium alloy. The silicon-vanadium alloy can be used for oxygen blowing to extract vanadium, and can also replace vanadium-iron alloy. Since iron, vanadium and part of titanium are reduced into the alloy, the remaining slag is a titanium-rich slag, which can be further extracted to produce TiO2 and be used for producing titanium dioxide.

[0024] The technical solutions in the present application can be combined with each other to realize more preferred combination solutions. Other features and advantages of the present application will be described in the following description, and some advantages will become apparent from the description, or will be understood by those skilled in the art through implementation of the present application. The objects and other advantages of the present application can be realized and obtained by the specific embodiments described in the description and the contents particularly pointed out in the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0025] The accompanying drawings are included to provide a further understanding of the present application, and are incorporated herein and constitute a part of the present application.

[0026] Figure 1 A flow chart of the smelting method of vanadium-titanium magnetite provided by the present application. DETAILED DESCRIPTION

[0027] The preferred embodiments of the present application will be specifically described below in combination with the accompanying drawings, wherein the drawings constitute a part of the present application and are used to explain the principles of the present application together with the embodiments of the present application, but are not used to limit the scope of the present application.

[0028] The present application provides a smelting method of vanadium-titanium magnetite, referring to Figure 1 , comprising the following steps:

[0029] Step I: vertical furnace gas-based direct reduction of vanadium-titanium magnetite oxidized pellets and reducing gas to obtain metallized pellets;

[0030] Step II: hot charging of the metallized pellets into an electric furnace (for example, a bare arc operation electric furnace), and performing primary separation without adding a reducing agent to generate low-carbon molten steel and iron vanadium titanium slag, wherein the mass percentage of C in the low-carbon molten steel is <0.1%, the mass percentage of Fe is >99.0%, and the contents of elements such as silicon, manganese, P, and S are very low;

[0031] It should be noted that, on the one hand, the metallized pellets do not contain carbon, and the electric furnace separation is performed without adding a reducing agent, and since there is no carbon in the separation process, the molten iron will not be carburized, so that low-carbon molten iron can be prepared; on the other hand, in the primary separation process, the low-carbon molten iron and the iron vanadium titanium slag are mainly separated by relying on the difference in density.

[0032] Step III: mixing of the iron vanadium titanium slag and coke and charging into an electric furnace (for example, a submerged arc operation electric furnace) to perform secondary separation reduction, the secondary separation temperature is 1600-1800℃, the secondary separation time is 60-120min, and silicon vanadium alloy and titanium-rich slag are generated, wherein the mass percentage of V in the silicon vanadium alloy is >3%, and the mass percentage of TiO2 in the titanium-rich slag is >50%.

[0033] Compared with the prior art, the smelting method of the vanadium-titanium magnetite provided by the application adopts a method of vertical furnace gas-based direct reduction, primary melting separation and secondary melting separation, and iron, vanadium and titanium resources in the vanadium-titanium magnetite are recovered in stages to prepare low-carbon molten steel and silicon-vanadium alloy respectively, and the low-carbon molten steel is used for producing ultra-pure steel, and the iron, vanadium and titanium in the vanadium-titanium magnetite are used in a high-value way.

[0034] Specifically, the metallized pellets are hot-charged into the electric furnace, and the hot-charging of the metallized pellets not only can reduce the electric melting power consumption, but also can avoid carburization of the metallized pellets in the cooling process, and is beneficial to obtaining molten steel with very low carbon content.

[0035] In the first melting separation, the iron oxide in the vanadium-titanium magnetite is reduced into iron, and the generated iron has low impurity content and can be used for preparing other ultra-pure steel, because on the one hand, SiO2, MnO and vanadium oxide cannot be reduced by CO and cannot enter the iron, and are left in the slag; on the other hand, CO is difficult to react with the metallic iron to generate Fe3C, so that the carburization amount of the metallized pellets is small.

[0036] In the second melting separation, the iron-vanadium-titanium slag is added with coke for secondary deep reduction, and according to the selective reduction principle, the iron oxide, vanadium oxide and part of the silicon dioxide in the slag are reduced into the alloy to obtain silicon-vanadium alloy, which can be used for oxygen blowing to extract vanadium, and can also replace vanadium-iron alloy. Since iron, vanadium and part of titanium are reduced into the alloy, the remaining slag is a titanium-rich slag, and TiO2 can be further extracted to produce titanium dioxide.

[0037] In order to obtain a higher metallization rate, in the above step I, the gas-solid ratio is 1.2-1.6 m 3 / kg, and the vertical furnace gas-based direct reduction is carried out. In actual application, the metallization rate of the obtained metallized pellets is 85%-90%, so as to effectively ensure the iron recovery rate.

[0038] In order to reduce the electric furnace energy consumption, in the above step II, the hot-charging temperature of the metallized pellets is 700-900℃. This is because, if the hot-charging temperature is too low, the electric melting power consumption is high, and if the hot-charging temperature is too high, the conveying equipment is difficult to withstand high temperature.

[0039] In order to fully melt, in the above step II, the primary melting temperature is 1550-1650℃, and the melting time is 30-90min. This is because, if the melting temperature is too low and the melting time is too short, full melting cannot be achieved, and the melting efficiency is reduced; if the melting temperature is too high and the melting time is too long, not only the electric power consumption is high, but also the service life of the electric furnace is shortened.

[0040] In order to improve the recovery rate of the alloy, the amount of coke added in step III is 15-25% of the mass of the iron-vanadium-titanium slag. In this way, the amount of coke is sufficient to promote the reduction of the alloy and improve the recovery rate of the alloy.

[0041] In step I, the volume percentage of CO in the reducing gas is 55-70%, and the volume percentage of H2 is 30-45%. This is because the reduction of iron by CO is an exothermic reaction, and the reduction of iron by H2 is an endothermic reaction. The content of CO and H2 is limited within the above range, and the amount of heat released and absorbed is equivalent, which is beneficial to the stable operation of the reduction production.

[0042] In order to obtain CO, the following step is included before step I:

[0043] Step 1: sequentially connect the intermediate frequency furnace and the gasifier, and the gasifier is arranged above the intermediate frequency furnace;

[0044] Step 2: load pig iron into the intermediate frequency furnace, melt it into molten iron by induction heating, and form a molten iron pool in the intermediate frequency furnace;

[0045] Step 3: spray coal powder, slagging agent and O2 into the molten iron pool through an oxygen-coal lance;

[0046] Step 4: S in the coal powder reacts with the slagging agent on the surface of the molten iron pool to fix S in the molten iron and slag, O2 and coal powder react on the surface of the molten iron pool to generate coal gas, ash in the coal powder reacts with the slagging agent on the surface of the molten iron pool to generate slag with a lower melting point, and high-quality coal gas with low sulfur content is generated, which includes CO.

[0047] The coal powder, O2 sprayed in the oxygen-coal lance and the molten iron in the intermediate frequency furnace react as follows:

[0048] 2C + O2(g) = 2CO(g)

[0049] C + O2(g) = CO2(g)

[0050] 3Fe + C = Fe3C

[0051] 2Fe3C + O2 = 6Fe + 2CO(g)

[0052] In this way, the process combining O2 and coal powder injection for gas making and molten iron bath for slagging can realize online desulfurization while coal gas making, and low-sulfur coal gas is obtained. Specifically, the gas making furnace is installed above the medium frequency furnace, the molten iron bath is arranged in the medium frequency furnace, O2 and coal powder are injected into the molten iron bath, the molten iron and molten slag absorb the sulfur in the coal powder, and the sulfur in the coal powder is solidified in the molten iron and molten slag, so that low-sulfur high-temperature coal gas can be obtained. This high-temperature coal gas can be directly used for reduction in the shaft furnace, and the subsequent cooling, desulfurization and heating processes of the coal gas are omitted, effectively solving the problems of long process flow, high sulfur removal cost and great difficulty in heating the coal gas caused by the cooling, desulfurization and heating of the coal gas made by the coal gas making process.

[0053] Meanwhile, since the ash (for example, SiO2 and Al2O3) in the coal powder has a high melting point, the slagging agent is injected into the molten iron bath through the oxygen-coal injection lance, and the ash reacts with the slagging agent to generate molten slag with a low melting point. This molten slag floats on the surface of the molten iron in a liquid state, which is convenient for discharging from the medium frequency furnace.

[0054] In order to be able to carry out post-treatment such as dust removal and moisture removal on the produced coal gas, the above step 4 further includes the following steps:

[0055] Step 5: Post-treatment of the coal gas produced in step 4, for example, the post-treatment includes dust removal and reforming in sequence.

[0056] Specifically, the dust removal includes the following steps:

[0057] Step a: The coal gas produced in step 4 is introduced into the coal gas ascending pipe and the coal gas descending pipe connected in sequence. In the coal gas ascending pipe, part of the dust in the coal gas falls on the side wall of the coal gas ascending pipe under the action of gravity and moves downward to return to the gas making furnace, completing the first dust removal.

[0058] Step b: The coal gas after the first dust removal is introduced into the bottom of the first settling chamber through the coal gas descending pipe, and then the coal gas after the first dust removal moves upward along the inner wall between the coal gas descending pipe and the first settling chamber. Part of the dust in the coal gas falls to the bottom of the first settling chamber under the action of gravity, completing the second dust removal.

[0059] Step c: The coal gas after the second dust removal enters the second settling chamber from the side of the second settling chamber, and cyclone dust removal is carried out, completing the third dust removal.

[0060] The structure of the second settling chamber, in particular, is a cyclone separation structure, which comprises a cyclone cone and a cyclone duct, the cyclone cone is provided with a cyclone inlet on the side surface, the gas outlet direction of the cyclone inlet is arranged in an inclined manner relative to the radial direction of the cyclone cone, the cyclone inlet is connected with the gas outlet of the first settling chamber, the bottom end of the cyclone cone is closed, the cyclone duct is arranged in the cyclone cone in a coaxial manner, and the bottom end of the cyclone duct is connected with the cyclone cone in a sealed manner, and the top end of the cyclone duct is connected with the cyclone cone in a sealed manner. In this way, the coal gas enters the cyclone cone from the cyclone inlet, and flows downward along the cyclone cone to the bottom end of the cyclone cone; since the bottom end of the cyclone cone is closed, the coal gas can only flow into the cyclone duct through the airflow annulus, and then move upward along the cyclone duct and flow out of the second settling chamber, and the dust in the coal gas is deposited at the bottom of the cyclone cone.

[0061] The reforming specifically comprises the following steps:

[0062] The dedusted coal gas and the natural gas are respectively introduced into the coal gas reforming furnace.

[0063] In the coal gas reforming furnace, the dedusted coal gas and the natural gas react to convert CO2 in the dedusted coal gas into CO.

[0064] This is because, in the gas making furnace, the pulverized coal and O2 react to generate CO2, which is inevitable in the whole process. Through the arrangement of the coal gas reforming furnace, the CO2 in the high-temperature coal gas reacts with CH4 in the natural gas to generate CO and H2 (CO2+CH4=2CO+2H2), which reduces the CO2 content in the hot coal gas and improves the reduction potential of the coal gas. In this way, the coal gas reforming furnace can reform and adjust the temperature of the coal gas, and the reformed coal gas does not need to be cooled, desulfurized and heated, and can be directly used for the shaft furnace direct reduction.

[0065] Here, it is emphasized that, before being supplied into the shaft furnace, the coal gas is dedusted and reformed by using the tank body (for example, the coal gas reforming furnace, the first settling chamber and the second settling chamber) and the pipeline (the coal gas ascending pipe and the coal gas descending pipe), and the dust is dedusted by using the gravity and the change of the motion state of the dust itself, without the need of cooling the coal gas. On the basis of not cooling the coal gas, effective dust removal is realized, so that the dedusted and reformed coal gas can be directly used for the shaft furnace.

[0066] The present application will be further described below in combination with examples.

[0067] Example 1

[0068] The composition of the vanadium-titanium magnetite oxidized pellet in this example includes, in terms of mass percentage, TFe 54.50%, FeO 14.84%, V2O5 1.62% and TiO2 13.23%.

[0069] The smelting method of this example is as follows:

[0070] Vanadium-titanium magnetite oxide pellets were charged into a vertical shaft furnace for reduction. The reducing gas composition was 61.5% CO and 30.8% H2, with a gas-to-solid ratio of 1.2 m³ / s. 3 / kg, the reducing gas heating temperature is 950℃, the reduction time is 240min, and the metallization rate of the metallized pellets obtained by reduction is 88.5%. The metallized pellets are hot-charged into the electric furnace at a charging temperature of 750℃. The primary melting temperature of the electric furnace is 1550℃, and the melting time is 90min. The molten steel obtained by melting has an Fe content of 99.1% and a C content of 0.08%. The low-carbon molten steel is used to produce silicon steel. The iron-vanadium-titanium slag obtained by melting has an FeO content of 31.2%, a V2O5 content of 5.2%, and a TiO2 content of 36.9%. The iron-vanadium-titanium slag obtained by primary melting is mixed with 20% coke by mass and subjected to secondary melting in the electric furnace at a melting temperature of 1750℃ and a melting time of 90min. The melting yields silicon-vanadium alloy and titanium-rich slag. The silicon-vanadium alloy has a V content of 9.8% and a Si content of 6.4%, and the titanium-rich slag has a TiO2 content of 56.8%.

[0071] Example 2

[0072] The composition of the vanadium-titanium magnetite oxide pellets in this embodiment, by mass percentage, includes: TFe 57.2%, FeO 32.56%, V2O 50.65%, and TiO 212.10%.

[0073] The smelting method in this embodiment is as follows:

[0074] Vanadium-titanium magnetite oxide pellets were charged into a vertical shaft furnace for reduction. The reducing gas composition was 60% CO and 30% H2, with a gas-to-solid ratio of 1.6 m³ / s. 3 / kg, the reducing gas heating temperature is 900℃, the reduction time is 300min, and the metallization rate of the metallized pellets obtained by reduction is 86.0%. The metallized pellets are hot-charged into the electric furnace at a charging temperature of 900℃. The primary melting temperature of the electric furnace is 1600℃, and the melting time is 60min. The molten steel obtained by melting has an Fe content of 99.3% and a C content of 0.06%. The low-carbon molten steel is used to produce industrial pure iron. The iron-vanadium-titanium slag obtained by melting has an FeO content of 34.5%, a V2O5 content of 2.1%, and a TiO2 content of 38.3%. The iron-vanadium-titanium slag obtained by primary melting is mixed with 25% coke by mass and subjected to secondary melting in the electric furnace at a melting temperature of 1800℃ and a melting time of 30min. The melting yields silicon-vanadium alloy and titanium-rich slag. The silicon-vanadium alloy has a V content of 3.6% and a Si content of 5.6%, and the titanium-rich slag has a TiO2 content of 60.2%.

[0075] Example 3

[0076] The vanadium-titanium magnetite oxidized pellet of the embodiment has a composition including, in percentage by mass, TFe 48.0%, FeO 20.3%, V2O5 1.70%, and TiO2 20.6%.

[0077] The smelting method of the embodiment is as follows:

[0078] The vanadium-titanium magnetite oxidized pellet is loaded into a shaft furnace for reduction, the reduction gas has a composition of CO 62% and H2 33%, the gas-solid ratio is 1.3 m 3 / kg, the reduction gas heating temperature is 950℃, the reduction time is 180 min, the metallization rate of the metallized pellet obtained by reduction is 85%, the metallized pellet is hot charged into an electric furnace, the hot charging temperature is 800℃, the one-time melting and separating temperature of the electric furnace is 1650℃, the melting and separating time is 90 min, the Fe content of the molten steel obtained by melting and separating is 99.0%, the C content is 0.09%, the low-carbon molten steel is used for producing silicon steel, the FeO content in the iron-vanadium-titanium furnace slag obtained by melting and separating is 25.6%, the V2O5 content is 6.3%, and the TiO2 content is 43.5%. The iron-vanadium-titanium furnace slag obtained by one-time melting and separating is added with 15% of coke in mass fraction for secondary melting and separating in an electric furnace, the melting and separating temperature is 1800℃, the melting and separating time is 60 min, silicon-vanadium alloy and titanium-rich slag are obtained by melting and separating, the V content in the silicon-vanadium alloy is 12.3%, and the Si content is 4.5%, the TiO2 content in the titanium-rich slag is 66.5%.

[0079] The above merely describes the preferred embodiments of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical scope disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A method of smelting vanadium titano-magnetite, characterized in that, It comprises the following steps: Step I: Vanadium-titanium magnetite oxidized pellets are subjected to shaft furnace gas-based direct reduction with reducing gas to obtain metallized pellets; Step II: The metallized pellets are loaded into an electric furnace, and under the condition of no additional reducing agent, primary separation is carried out to generate low-carbon molten steel and iron vanadium titanium slag; Step III: The iron vanadium titanium slag is mixed with coke and loaded into an electric furnace to carry out secondary separation reduction to generate silicon vanadium alloy and titanium-rich slag; Before the step I, it further comprises the following steps: Step 1: sequentially connecting an intermediate frequency furnace and a gasifier, and the gasifier is arranged above the intermediate frequency furnace; Step 2: loading pig iron into the intermediate frequency furnace to melt into molten iron by induction heating to form a molten iron pool in the intermediate frequency furnace; Step 3: spraying coal powder, slagging agent and O2 into the molten iron pool through an oxygen-coal lance; Step 4: S in the coal powder reacts with the slagging agent on the surface of the molten iron pool to fix S in the molten iron and the slag, and O2 and the coal powder react on the surface of the molten iron pool to generate coal gas; Step 5: sequentially carrying out dust removal and reforming on the coal gas generated in Step 4; The dust removal specifically comprises the following steps: Step a: passing the coal gas generated in Step 4 into a sequentially connected coal gas ascending pipe and a coal gas descending pipe, in the coal gas ascending pipe, part of the dust in the coal gas falls on the side wall of the coal gas ascending pipe under the action of gravity and moves downward to return to the gasifier to complete primary dust removal; Step b: passing the coal gas after primary dust removal into the bottom of a first settling chamber through the coal gas descending pipe, the coal gas after primary dust removal moves upward along the coal gas descending pipe and the inner wall of the first settling chamber, part of the dust in the coal gas falls to the bottom of the first settling chamber under the action of gravity to complete secondary dust removal; Step c: passing the coal gas after secondary dust removal into a second settling chamber from the side of the second settling chamber to carry out cyclone dust removal to complete tertiary dust removal; The dust removal utilizes the gravity and the change of the motion state of the dust to achieve dust removal without the need of cooling the coal gas; The second settling chamber comprises a cyclone cone and a wind guide cylinder, the side of the cyclone cone is provided with a cyclone inlet, the gas outlet direction of the cyclone inlet is arranged to be inclined relative to the radial direction of the cyclone cone, the cyclone inlet is connected with the gas outlet of the first settling chamber, the bottom end of the cyclone cone is closed, the wind guide cylinder is arranged in the cyclone cone and coaxially arranged with the cyclone cone, the bottom end of the wind guide cylinder and the cyclone cone have an airflow annular channel, and the top end of the wind guide cylinder is sealingly connected with the cyclone cone.

2. The smelting method of vanadium titano-magnetite as claimed in claim 1, characterized by, The step I, under the condition of gas-solid ratio 1.2~1.6 m 3 / kg, vertical shaft gas-based direct reduction is carried out.

3. The smelting method of vanadium titano-magnetite as claimed in claim 1, characterized by, In the step II, the metallized pellets are directly hot-loaded into the electric furnace.

4. The smelting process of vanadium titano-magnetite as claimed in claim 1, wherein, In the step II, the hot-loading temperature of the metallized pellets is 700-900℃.

5. The smelting process of vanadium titano-magnetite as claimed in claim 1, wherein, In the step II, the primary separation temperature is 1550-1650℃.

6. The smelting process of vanadium titano-magnetite as claimed in claim 1, wherein, In the step II, the primary separation time is 30-90min.

7. The smelting process of vanadium titano-magnetite as claimed in claim 1, wherein, In the primary separation process, the low-carbon molten steel and the iron vanadium titanium slag are separated by relying on the difference in density.

8. The smelting process of vanadium titano-magnetite as claimed in claim 1, wherein, In the step III, the addition amount of the coke is 15-25% of the mass of the iron vanadium titanium slag.

9. The smelting process of vanadium titano-magnetite as claimed in claim 1, wherein, In the step III, the secondary separation temperature is 1600-1800℃.

10. The smelting process of vanadium titano-magnetite as claimed in claim 1, wherein, In the step III, the secondary separation time is 60-120min.

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