Process for synergistically extracting vanadium from vanadium titano-magnetite and stone coal vanadium ore

Abstract

The invention discloses a process for synergistically extracting vanadium from vanadium titano-magnetite and stone coal vanadium ore. According to the process, a side-blown furnace is adopted, and the tail end of the side-blown furnace is communicated with a clarification vanadium blowing device through a chute; a feeding hole is formed in the top of the head end of the side-blown converter, and a flue is formed in the top of the tail end; a plurality of straight nozzles are formed in two side walls of the side blowing furnace; the process comprises the following steps: S1, uniformly mixing vanadium titano-magnetite and stone coal vanadium ore in proportion; s2, the mixed mineral materials are added from a feeding port of a side-blown furnace, and pulverized coal, oxygen-enriched air and natural gas are sprayed into the side-blown furnace through a direct nozzle for high-temperature smelting; s3, after the smelting reaction is completed, a melt is discharged into a chute through a discharge port of the side-blown converter and enters a clarification vanadium blowing device; according to the side-blown furnace, generation of by-products such as TiC in the smelting process is inhibited by injecting natural gas, the metal reduction reaction is fully carried out, the continuous melting and metal reduction process of the vanadium titano-magnetite and stone coal vanadium ore mixed mineral material is achieved, the defects of traditional multi-process step-by-step treatment are overcome, the blast furnace and non-blast furnace smelting technological process is shortened, and the production cost is reduced. And the equipment investment, the operation cost and the environmental load are reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of ore vanadium extraction, and in particular to a process for co-extracting vanadium from vanadium-titanium magnetite and stone coal vanadium ore. BACKGROUND

[0002] Vanadium extraction from vanadium-titanium magnetite mainly adopts pyrometallurgical technology, and part of it also uses hydrometallurgical technology. In the early stage, vanadium-titanium magnetite was extracted through a "blast furnace ironmaking-converter vanadium extraction" process, and the recovery rate of vanadium was only 40%-50%, resulting in waste of vanadium resources and a large amount of waste slag storage, and high energy consumption, large CO2 emissions and serious environmental impact. Moreover, in the process of blast furnace smelting, titanium and calcium, silicon and other elements form high-melting-point compounds (such as CaTiO3, CaTiSiO5), resulting in sticky slag that is difficult to discharge. In view of the problems existing in the blast furnace smelting process of vanadium-titanium magnetite, non-blast furnace smelting process systems with direct reduction-molten reduction as the core have been developed in foreign countries such as South Africa and New Zealand. For example, the rotary kiln direct reduction-electric furnace smelting reduction-converter vanadium extraction process. Although the current non-blast furnace smelting process has improved the recovery rate of vanadium and the separation efficiency of titanium slag, it still has problems such as large investment, long process and high energy consumption. In addition, vanadium-titanium magnetite can also be treated by sodium roasting method, which mixes it with sodium salt in a rotary kiln for oxidation roasting, so that the vanadium oxide in the mineral material is converted into soluble vanadate, and then water leaching is used to leach and separate vanadium. The remaining titanium-iron residue ball is sent to the rotary kiln for reduction, and the electric furnace is smelted to obtain molten iron and titanium slag, realizing slag and iron separation. Although this method is mature and has low investment, it produces harmful flue gas and high-salt wastewater in the process, resulting in serious environmental problems.

[0003] In addition, China's stone coal vanadium resources are very rich, but the vanadium occurrence state is complex (mainly isomorphism embedded in silicate minerals such as mica), and the traditional flat kiln roasting and calcification roasting process has problems such as low vanadium recovery rate (only 30%-40%), high energy consumption and serious pollution (SO2, Cl2 emissions exceed the standard). In order to optimize the extraction of stone coal vanadium resources, non-roasting processes such as acid leaching (sulfuric acid / hydrochloric acid system), alkali leaching (NaOH / Na2CO3 system) and microbial leaching have been developed in China, which effectively improves the vanadium recovery rate by optimizing the mineral dissociation degree and strengthening mass transfer, and avoids roasting pollution. However, these leaching processes also have problems such as difficulty in resource disposal of leaching slag solid waste and high cost of some processes. SUMMARY

[0004] In order to reduce cost, reduce energy consumption and improve efficiency, the present application provides a process for co-extracting vanadium from vanadium-titanium magnetite and stone coal vanadium ore.

[0005] The present application provides a process for co-extracting vanadium from vanadium-titanium magnetite and stone coal vanadium ore, which adopts the following technical solution:

[0006] The process for cooperatively extracting vanadium from vanadium-titanium magnetite and stone coal vanadium ore, which adopts a side-blown furnace, and the tail end of the side-blown furnace is connected with a clarifying vanadium blowing device through a chute; a feeding port is formed on the top of the head end of the side-blown furnace, and a flue is formed on the top of the tail end; a plurality of straight nozzles are formed on the side walls of the side-blown furnace, and the straight nozzles on the two sides are arranged in alignment; and the process comprises the following steps:

[0007] S1, uniformly mixing vanadium-titanium magnetite and stone coal vanadium ore according to a proportion;

[0008] S2, feeding the mixed mineral material from the feeding port of the side-blown furnace, and injecting pulverized coal (oxygen-enriched air) and natural gas into the side-blown furnace through the straight nozzles to perform high-temperature smelting, so that the metal oxides such as iron and vanadium in the raw materials are subjected to reduction reaction and form a melt, i.e., vanadium-containing molten iron and titanium slag;

[0009] S3, after the smelting reaction is completed, the melt is discharged from the discharge port of the side-blown furnace into the chute and then into the clarifying vanadium blowing device.

[0010] Optionally, in the step S2, the smelting temperature is 1450-1550℃, the amount of pulverized coal is 100-150kg / t of ore, the oxygen-enriched air concentration is 70-80vol%, and the bed capacity of the side-blown furnace is 40-50t / m 2 ·d, the residence time of the mineral material in the side-blown furnace is 2-3h, and the flue gas generated in the process is sent to a waste heat recovery system and a purification device.

[0011] Optionally, the straight nozzles are all perpendicular to the side surface of the side-blown furnace, and 3 / 4 of the total number of the straight nozzles are used to simultaneously inject pulverized coal and oxygen-enriched air, and the straight nozzles for injecting natural gas account for 1 / 4 of the total number, and the two types of straight nozzles are alternately arranged on the side surface of the side-blown furnace, and the injection of fuel and oxygen-enriched air simultaneously drives the stirring and overturning of the material.

[0012] Optionally, the side surface of the side-blown furnace near the tail end is also provided with an inclined nozzle, the width of the side-blown furnace is 2-2.4m, the distance of the inclined nozzle from the tail end of the side-blown furnace is L=400-500mm, the direction of the inclined nozzle forms an angle α=30-40° with the side surface of the side-blown furnace, and the injection of oxygen-enriched air into the inclined nozzle promotes the discharge of the fully reacted melt towards the discharge port.

[0013] Optionally, in the step S2, the straight nozzles are opened and the inclined nozzles are closed during the smelting of the mineral material in the side-blown furnace, and the inclined nozzles are opened and the straight nozzles are closed during the discharge of the melt; and the side-blown furnace is continuously fed and intermittently discharged.

[0014] Optionally, the clarifying and vanadium blowing device is a secondary side-blown furnace, the melt is discharged from the side-blown furnace outlet into a trough and then into the secondary side-blown furnace, the secondary side-blown furnace is also provided with a straight jet nozzle, and a slag discharge port and a molten iron discharge port are arranged at the tail end; the straight jet nozzle is opened to spray natural gas and oxygen-enriched air into the secondary side-blown furnace, so that the temperature in the furnace is increased to 1500-1600℃. Then the straight jet nozzle is closed and the melt is clarified. When the temperature in the secondary side-blown furnace is reduced to 1450-1550℃ again and the clarification time reaches 30-40min, the titanium slag is discharged from the slag discharge port of the side-blown furnace. After the titanium slag is separated, the straight jet nozzle is opened again to blow only oxygen-enriched air into the secondary side-blown furnace for oxygen-enriched blowing and vanadium extraction. The blowing temperature is controlled at 1300-1350℃, the blowing time is 4-7min, and after the blowing is completed, the vanadium slag is separated and recovered. The molten iron after vanadium extraction is sent to the steelmaking system.

[0015] Optionally, the clarifying and vanadium blowing device is an electric furnace, the melt is discharged from the side-blown furnace outlet into a trough and then into the electric furnace. First, the titanium slag is removed by clarification and separation under heat preservation conditions. The heat preservation temperature is 1450-1550℃, and the clarification time is 30-40min. After the titanium slag is separated, an oxygen-enriched blowing lance is inserted into the electric furnace for oxygen-enriched blowing and vanadium extraction. The blowing temperature is controlled at 1300-1350℃, the blowing time is 6-10min, and after the blowing is completed, the vanadium slag is separated and recovered. The molten iron after vanadium extraction is sent to the steelmaking system.

[0016] In summary, the present application has the following beneficial technical effects:

[0017] (1) The side-blown furnace suppresses the generation of by-products such as TiC in the smelting process by spraying natural gas, so that the metal reduction reaction is fully carried out, realizing the continuous melting and metal reduction process of vanadium-titanium magnetite and stone coal vanadium ore mixed mineral materials, breaking the traditional multi-process step-by-step processing defects, shortening the blast furnace and non-blast furnace smelting process, and reducing equipment investment, operation cost and environmental load;

[0018] (2) The side-blown furnace smelting effectively improves the gas-solid-liquid three-phase mixed system, strengthens the mass transfer and heat transfer of metal smelting, shortens the process time, and reduces energy consumption. If the melt clarification and vanadium blowing after smelting are completed in the secondary side-blown furnace, it is suitable for wide use in areas rich in natural gas. If it is completed in an electric furnace, it is suitable for wide use in areas rich in electricity.

[0019] (3) Vanadium-titanium magnetite and stone coal vanadium ore are jointly charged, and the stone coal vanadium ore has the dual characteristics of fuel and reducing medium, which provides the heat required for smelting while realizing the reduction of iron and vanadium oxides. Combined with the side-blown furnace smelting-side-blown furnace / electric furnace clarification and vanadium blowing process, a complex and efficient treatment system for multiple vanadium resources is constructed, and the comprehensive recovery efficiency of vanadium resources is improved. BRIEF DESCRIPTION OF DRAWINGS

[0020] Fig. 1is the overall structure front view of the device used in Embodiments 1, 2 and 3 of the present application;

[0021] Fig. 2 is the overall structure front view of the device used in Embodiments 4, 5 and 6 of the present application.

[0022] Explanation of reference signs:

[0023] 1, side-blown furnace; 2, feed inlet; 3, flue; 4, straight nozzle; 5, inclined nozzle; 6, chute; 7, secondary side-blown furnace; 8, slag outlet; 9, molten iron outlet; 10, electric furnace; 11, electrode; 12, lance. DETAILED DESCRIPTION

[0024] The following will be described in detail in combination with the accompanying Figs. 1-2 The present application will be further described in detail.

[0025] The present application discloses a process for synergistically extracting vanadium from vanadium-titanium magnetite and stone coal vanadium ore. The process uses a side-blown furnace 1, the end of which is connected to a clarifying vanadium blowing device through a chute 6; the top of the first end of the side-blown furnace 1 is provided with a feed inlet, and the top of the end is provided with a flue 3; a plurality of straight nozzles 4 are arranged on the two side walls of the side-blown furnace 1, and the straight nozzles 4 on the two sides are arranged in alignment;

[0026] The straight nozzles 4 are all perpendicular to the side surface of the side-blown furnace 1, and the straight nozzles 4 for spraying pulverized coal and oxygen-enriched air account for 3 / 4 of the total number, and the straight nozzles 4 for spraying natural gas account for 1 / 4 of the total number. The two kinds of straight nozzles 4 are alternately arranged in alignment on the side surface of the side-blown furnace 1, and the fuel and oxygen-enriched air are sprayed at the same time to drive the material stirring and overturning.

[0027] The two side surfaces of the side-blown furnace 1 near the end are also provided with inclined nozzles 5, the overall width of the side-blown furnace 1 is 2-2.4 m, the distance between the inclined nozzles 5 and the end of the side-blown furnace 1 is L=400-500 mm, the angle between the direction of the inclined nozzles 5 and the horizontal direction of the side surface of the side-blown furnace 1 is α=30-40°, and the oxygen-enriched air sprayed by the inclined nozzles 5 promotes the reaction of the molten material to be fully discharged from the discharge port;

[0028] The process comprises the following steps:

[0029] S1, uniformly mixing vanadium-titanium magnetite and stone coal vanadium ore at a weight ratio of 1:(0.40-0.45), and the particle size of the mineral material is 200-300 mesh;

[0030] S2, the mixed mineral material is added from the feed inlet 2 of the side-blown furnace 1, high-temperature smelting is carried out by spraying pulverized coal (oxygen-enriched air) and natural gas into the side-blown furnace 1 through the straight nozzle 4, and reduction reactions of metal oxides such as iron and vanadium in the raw material occur to form a melt, i.e. vanadium-containing molten iron and titanium slag; wherein the smelting temperature is 1450-1550℃, the pulverized coal consumption is 100-150kg / t of ore, the oxygen-enriched air concentration is 70-80vol%, and the bed capacity of the side-blown furnace 1 is 40-50t / m 2 ·d, the residence time of the mineral material in the side-blown furnace 1 is 2-3h, and the flue gas generated in the process is sent to a waste heat recovery system and a purification device; when the mineral material is smelted in the side-blown furnace 1, the straight nozzle 4 is opened and the inclined nozzle 5 is closed, and when the material is discharged, the inclined nozzle 5 is opened and the straight nozzle 4 is closed; the side-blown furnace 1 is continuously fed and intermittently discharges the melt;

[0031] S3, after the smelting reaction is completed, the melt is discharged from the discharge outlet of the side-blown furnace 1 into the trough 6 and then into the clarifying vanadium blowing device; the clarifying vanadium blowing device is an electric furnace 10 or a secondary side-blown furnace 7.

[0032] When the clarifying vanadium blowing device is the secondary side-blown furnace 7, the melt is discharged from the discharge outlet of the side-blown furnace 1 into the trough 6 and then into the secondary side-blown furnace 7, and the straight nozzle 4 is also provided on the secondary side-blown furnace 7, and a slag discharge port 8 and a molten iron discharge port 9 are provided at the tail end; the straight nozzle 4 is opened to spray natural gas and oxygen-enriched air into the secondary side-blown furnace 7 to increase the temperature in the furnace to 1500-1600℃; then the straight nozzle 4 is closed for clarification, and when the temperature of the secondary side-blown furnace 7 is reduced to 1450-1550℃ again and the clarification time reaches 30-40min, the titanium slag is discharged from the slag discharge port 8 of the side-blown furnace 1; after the titanium slag is separated, the straight nozzle 4 is opened again to blow only oxygen-enriched air into the secondary side-blown furnace 7 for oxygen-enriched blowing to extract vanadium, and the blowing temperature is controlled at 1300-1350℃, the blowing time is 4-7min, and after the blowing is completed, the vanadium slag is separated and recovered, and the iron melt after vanadium extraction is sent to a steelmaking system.

[0033] When the clarifying vanadium blowing device is the electric furnace 10, the melt is discharged from the discharge outlet of the side-blown furnace 1 into the trough 6 and then into the electric furnace 10; first, the titanium slag is removed by clarification under insulation conditions, the insulation temperature is 1450-1550℃, and the clarification time is 30-40min; after the titanium slag is separated, an oxygen-enriched blowing lance is inserted into the electric furnace 10 for oxygen-enriched blowing to extract vanadium, the blowing temperature is controlled at 1300-1350℃, the blowing time is 6-10min, and after the blowing is completed, the vanadium slag is separated and recovered, and the iron melt after vanadium extraction is sent to a steelmaking system.

[0034] The specific principle of the above process is as follows:

[0035] The principle of the side-blown furnace 1 reduction smelting is that the iron oxide (such as Fe3O4, etc.) in the mixed mineral materials of vanadium-titanium magnetite and stone coal vanadium ore is reduced to form molten iron at high temperature by C, CO, etc., and the high-valence vanadium oxide (V2O5) is reduced to V2O3 and enters the molten iron. In this high-temperature process, TiO2 is easily reduced to Ti under the strong reducing atmosphere of the carbonaceous reducing agent, and then reacts with the surrounding carbon and nitrogen to form TiC, TiN and other by-products, resulting in increased slag viscosity and insufficient metal reduction reaction.

[0036] To reduce the generation of TiC and other by-products, fully reduce the iron and vanadium metal, and stably retain the titanium in the smelting slag, the present application uses natural gas to partially replace the pulverized coal, provides H2 by CH4 decomposition, reduces the CO partial pressure, thereby achieving one-step reduction smelting of vanadium-titanium magnetite and stone coal vanadium ore in the side-blown furnace 1 to form vanadium-containing molten iron and titanium slag; the principle of the electric furnace 10 / side-blown furnace 1 blowing vanadium is that V2O3 in the vanadium-containing molten iron is oxidized to V2O5 by the blown-in O2 at high temperature, thereby forming a slag phase from the molten iron to recover vanadium.

[0037] In the following examples, the reduction smelting side-blown furnace bed area is 12m 2 , the secondary side-blown furnace bed area is 10m 2 , and the electric furnace bed area is 10m 2 , the vanadium-titanium magnetite contains 56.0% of Fe, 0.7% of V2O5, and 8.0% of TiO2; the stone coal vanadium ore contains 0.58% of V2O5, 51% of carbon, and 5% of volatile matter.

[0038] Example 1

[0039] 17.3t / h vanadium-titanium magnetite and 7.7t / h stone coal are added to the side-blown furnace 1. Then, the pulverized coal 2.5t / h (80% oxygen-enriched air) and natural gas are sprayed from the straight nozzle 4 to smelt, the smelting temperature is controlled at 1450℃, and the time is 2h, and the smelting is completed to discharge the melt into the secondary side-blown furnace 7. The temperature of the secondary side-blown furnace 7 is raised to 1500℃ by spraying natural gas and oxygen-enriched air through the straight nozzle 4, then the straight nozzle 4 is closed, and the titanium slag is separated from the molten iron after standing for 30min, thereby discharging the titanium slag into the slag ladle. Then, 80% oxygen-enriched air is blown into the secondary side-blown furnace 7 through the straight nozzle 4 to extract vanadium, and the blowing vanadium temperature is 1300℃ and the time is 4min. The vanadium-containing molten iron after vanadium extraction is discharged from the secondary side-blown furnace 7 into the molten iron ladle, and the vanadium slag is fished out, the vanadium content of the vanadium extraction molten iron is 0.09%, and the vanadium extraction rate of the molten iron reaches 78%.

[0040] Example 2

[0041] Vanadium-titanium magnetite 15.5 t / h and stone coal 6.5 t / h are added into the side-blown furnace 1. Then, pulverized coal 3 t / h (75% oxygen-enriched air) and natural gas are sprayed from the straight nozzle 4 to smelt, and the smelting temperature is controlled at 1480°C for 2.5 h. The molten material is discharged into the secondary side-blown furnace 7. The temperature of the secondary side-blown furnace 7 is raised to 1530°C by spraying natural gas and oxygen-enriched air from the straight nozzle 4, and then the straight nozzle 4 is closed. After 35 min of standing and clarification, the titanium slag is separated from the molten iron, and thus the titanium slag is discharged into the slag ladle. Then, 75% oxygen-enriched air is blown from the straight nozzle 4 in the secondary side-blown furnace 7 to extract vanadium, and the vanadium extraction temperature is 1320°C for 6 min. The molten iron after vanadium extraction is discharged into the ladle from the electric furnace 10, and the vanadium slag is fished out. The vanadium content of the vanadium extraction molten iron is 0.08%, and the vanadium extraction rate of the molten iron reaches 80%.

[0042] Example 3

[0043] Vanadium-titanium magnetite 15.5 t / h and stone coal 6.5 t / h are added into the side-blown furnace 1. Then, pulverized coal 3 t / h (75% oxygen-enriched air) and natural gas are sprayed from the straight nozzle 4 to smelt, and the smelting temperature is controlled at 1480°C for 2.5 h. The molten material is discharged into the secondary side-blown furnace 7. The temperature of the secondary side-blown furnace 7 is raised to 1530°C by spraying natural gas and oxygen-enriched air from the straight nozzle 4, and then the straight nozzle 4 is closed. After 35 min of standing and clarification, the titanium slag is separated from the molten iron, and thus the titanium slag is discharged into the slag ladle. Then, 75% oxygen-enriched air is blown from the straight nozzle 4 in the secondary side-blown furnace 7 to extract vanadium, and the vanadium extraction temperature is 1320°C for 6 min. The molten iron after vanadium extraction is discharged into the ladle from the electric furnace 10, and the vanadium slag is fished out. The vanadium content of the vanadium extraction molten iron is 0.08%, and the vanadium extraction rate of the molten iron reaches 80%.

[0044] Examples 4, 5 and 6 are different from Examples 1, 2 and 3 in that the clarification vanadium blowing device is different. In the subsequent examples, the clarification vanadium blowing device is the electric furnace 10, and the electric furnace 10 is provided with no nozzle on the side wall, an electrode 11 at the top end, a flue 3 and a blowing gun. Similarly, the electric furnace 10 is provided with a slag discharge port 8 and a molten iron discharge port 9 at the end.

[0045] Example 4

[0046] Vanadium titanium magnetite 17.3 t / h and stone coal 7.7 t / h are added into the side-blown furnace 1. Then, pulverized coal 2.5 t / h (80% oxygen-enriched air) and natural gas are sprayed from the straight nozzle 4 to smelt, the smelting temperature is controlled at 1450℃, the time is 2h, the smelting is completed, the melt is discharged into the electric furnace 10, the titanium slag is separated from the molten iron at 1450℃ for 30 min, and then the titanium slag is discharged into the slag ladle. Then, the lance is inserted into the molten iron in the electric furnace 10 to blow 80% oxygen-enriched air to extract vanadium, the vanadium blowing temperature is 1300℃, and the time is 9 min. The molten iron after vanadium extraction is discharged from the electric furnace 10 into the ladle, the vanadium slag is fished out, the vanadium content of the molten iron after vanadium extraction is 0.1%, and the vanadium extraction rate of the molten iron reaches 75%.

[0047] Example 5

[0048] Vanadium titanium magnetite 17.3 t / h and stone coal 7.7 t / h are added into the side-blown furnace 1. Then, pulverized coal 2.5 t / h (80% oxygen-enriched air) and natural gas are sprayed from the straight nozzle 4 to smelt, the smelting temperature is controlled at 1450℃, the time is 2h, the smelting is completed, the melt is discharged into the electric furnace 10, the titanium slag is separated from the molten iron at 1450℃ for 30 min, and then the titanium slag is discharged into the slag ladle. Then, the lance is inserted into the molten iron in the electric furnace 10 to blow 80% oxygen-enriched air to extract vanadium, the vanadium blowing temperature is 1300℃, and the time is 9 min. The molten iron after vanadium extraction is discharged from the electric furnace 10 into the ladle, the vanadium slag is fished out, the vanadium content of the molten iron after vanadium extraction is 0.1%, and the vanadium extraction rate of the molten iron reaches 75%.

[0049] Example 6

[0050] Vanadium titanium magnetite 17.3 t / h and stone coal 7.7 t / h are added into the side-blown furnace 1. Then, pulverized coal 2.5 t / h (80% oxygen-enriched air) and natural gas are sprayed from the straight nozzle 4 to smelt, the smelting temperature is controlled at 1450℃, the time is 2h, the smelting is completed, the melt is discharged into the electric furnace 10, the titanium slag is separated from the molten iron at 1450℃ for 30 min, and then the titanium slag is discharged into the slag ladle. Then, the lance is inserted into the molten iron in the electric furnace 10 to blow 80% oxygen-enriched air to extract vanadium, the vanadium blowing temperature is 1300℃, and the time is 9 min. The molten iron after vanadium extraction is discharged from the electric furnace 10 into the ladle, the vanadium slag is fished out, the vanadium content of the molten iron after vanadium extraction is 0.1%, and the vanadium extraction rate of the molten iron reaches 75%.

[0051] The above are preferred embodiments of the present application, which do not limit the protection scope of the present application, therefore: any equivalent changes made according to the structure, shape, principle of the present application should be covered into the protection scope of the present application.

Claims

1. A process for synergistic vanadium extraction from vanadium-titanium magnetite and vanadium shale coal, characterized in that: This process employs a side-blown furnace, with its end connected to a vanadium clarification blowing device via a chute. The top of the beginning of the side-blown furnace has a feed inlet, and the top of the end has a flue. Multiple straight nozzles are installed on both sides of the furnace's side walls, aligned symmetrically. The process includes the following steps: S1. Mix vanadium-titanium magnetite and vanadium shale coal ore evenly in a certain proportion; S2. Add the mixed mineral materials from the feed port of the side-blown furnace, and inject pulverized coal, natural gas and oxygen-enriched air into the side-blown furnace through a straight nozzle for high-temperature smelting, so that the metal oxides such as iron and vanadium in the raw materials undergo a reduction reaction and form a melt, namely vanadium-containing molten iron and titanium slag. S3. After the smelting reaction is completed, the melt is discharged into the chute through the side-blown furnace outlet and then into the clarification and vanadium blowing device.

2. The process for co-extracting vanadium from vanadium-titanium magnetite and vanadium-bearing shale coal according to claim 1, characterized in that: In step S2, the smelting temperature is 1450-1550℃, the pulverized coal consumption is 100-150 kg / ton of ore, the oxygen enrichment concentration is 70-80 vol%, and the bed capacity of the side-blown furnace is 40-50 t / m. 2 •d, the residence time of the mineral material in the side-blown furnace is 2-3 hours, and the flue gas generated during the process is sent to the waste heat recovery system and purification device.

3. The process for synergistic vanadium extraction from vanadium-titanium magnetite and vanadium-bearing shale coal according to claim 2, characterized in that: All the straight nozzles are perpendicular to the side of the side-blown furnace, and 3 / 4 of the total number of straight nozzles are used to spray pulverized coal and oxygen-enriched air at the same time, while the straight nozzles that spray natural gas account for 1 / 4 of the total number; the two types of straight nozzles are arranged alternately on the side of the side-blown furnace, and while injecting fuel and oxygen-enriched air, they drive the material to stir and turn.

4. The process for synergistic vanadium extraction from vanadium-titanium magnetite and vanadium-bearing shale coal according to claim 3, characterized in that: The side of the side-blown furnace near the tail end is also equipped with an oblique nozzle. The width of the side-blown furnace is 2-2.4m. The oblique nozzle is 400-500mm away from the end of the side-blown furnace. The angle between its direction and the side of the side-blown furnace is α=30-40°. The nozzle sprays oxygen-enriched air to promote the fully reacted melt to be discharged to the outlet.

5. The process for co-extracting vanadium from vanadium-titanium magnetite and vanadium-bearing shale coal according to claim 4, characterized in that: In step S2, the straight nozzle is opened and the inclined nozzle is closed when the mineral material is smelted in the side-blown furnace, while the inclined nozzle is opened and the straight nozzle is closed when the material is discharged; the side-blown furnace is continuously fed and intermittently discharged.

6. The process for co-extracting vanadium from vanadium-titanium magnetite and vanadium-bearing shale coal according to claim 5, characterized in that: The vanadium clarification and blowing device is a secondary side-blown furnace. The molten metal is discharged into the secondary side-blown furnace through the discharge port of the side-blown furnace into a chute. The secondary side-blown furnace is also equipped with a straight nozzle, and a slag discharge port and a molten iron discharge port at the tail end. Natural gas and oxygen-enriched air are injected into the secondary side-blown furnace through the straight nozzle, raising the furnace temperature to 1500-1600℃. Then the straight nozzle is closed and the furnace is allowed to settle and clarify. When the temperature of the secondary side-blown furnace drops back to 1450-1550℃ and the clarification time reaches 30-40 minutes, the titanium slag is discharged from the slag discharge port of the side-blown furnace. After the titanium slag is separated, the straight nozzle is reopened to blow oxygen-enriched air into the secondary side-blown furnace for oxygen-enriched blowing to extract vanadium. The blowing temperature is controlled at 1300-1350℃ and the blowing time is 4-7 minutes. After the blowing is completed, the vanadium slag is separated and recovered, and the molten iron after vanadium extraction is sent to the steelmaking system.

7. The process for co-extracting vanadium from vanadium-titanium magnetite and vanadium-bearing shale coal according to claim 5, characterized in that: The vanadium clarification and blowing device is an electric furnace. The molten metal is discharged into the electric furnace through the discharge port of the side-blown furnace and enters the chute. First, the titanium slag is removed by clarification and separation under the heat preservation condition. The heat preservation temperature is 1450-1550℃ and the clarification time is 30-40min. After the titanium slag is separated, an oxygen-enriched blowing gun is inserted into the electric furnace for oxygen-enriched blowing to extract vanadium. The blowing temperature is controlled at 1300-1350℃ and the blowing time is 6-10min. After the blowing is completed, the vanadium slag is separated and recovered, and the molten iron after vanadium extraction is sent to the steelmaking system.

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