System and method for producing titanium concentrate by using vanadium titano-magnetite iron separation tailings

Abstract

The invention discloses a system for producing titanium concentrate through vanadium titano-magnetite iron separation tailings. The system comprises a hydrocyclone device, a high-frequency vibrating screen device, a weak magnetic drum type magnetic separator device, a ball mill, a first titanium concentrate separation device and a second titanium concentrate separation device. The first titanium concentrate separation device is used for enriched ilmenite roughing and enriched ilmenite scavenging of tailings generated by enriched ilmenite roughing; the second titanium concentrate separation device is used for adjusting the ore pulp concentration of the first titanium concentrate generated by the enriched ilmenite roughing and then carrying out enriched ilmenite concentration, so that the quantity of materials entering the ore grinding and flotation operation can be obviously reduced, and the reagent consumption of the ilmenite flotation operation can be reduced; therefore, the recovery rate of vanadium titano-magnetite titanium resources is increased, and the production cost of titanium concentrate is reduced. The invention further discloses a method for producing the titanium concentrate through the vanadium titano-magnetite iron dressing tailings. The method has the same advantages as the system.

Description

Technical Field

[0001] This invention belongs to the field of comprehensive utilization technology of vanadium-titanium magnetite, and in particular relates to a system and method for producing titanium concentrate from iron tailings of vanadium-titanium magnetite. Background Technology

[0002] Titanium is an important and rare strategic metal with a series of superior properties unmatched by other metals, including high specific strength, light weight, corrosion resistance, shape memory, good ductility and biocompatibility, superconductivity, and strong surface decorative properties. It has wide applications in aerospace, petrochemicals, construction, power, medical, and sporting goods, and is often referred to as the "third metal" after iron and aluminum. TiO2 is the best white inorganic pigment and is widely used in coatings, plastics, synthetic fibers, rubber, papermaking, printing inks, and cosmetics. The main industrially valuable titanium-bearing minerals in nature are ilmenite and rutile, with approximately 93.42% of titanium resources (based on TiO2) existing in the form of ilmenite.

[0003] The recovery of middlings titanium resources from iron tailings in vanadium-titanium magnetite beneficiation has undergone several innovations, evolving from spiral sluice gravity separation-flotation desulfurization-drying-electrostatic separation to the now widely used high-intensity magnetic separation (+spiral sluice gravity separation)-flotation desulfurization-flotation titanium separation. Currently, the TiO2 grade of the material entering the flotation desulfurization titanium separation process is generally 11% to 18%, while the TiO2 grade of the ilmenite concentrate is generally 45% to 47%, requiring the addition of large amounts of sulfuric acid and other flotation reagents. High acidity leads to high reagent consumption and severe corrosion of equipment and pipelines in titanium separation operations. Therefore, there is an urgent need to develop a low-cost method for producing titanium concentrate and reducing reagent consumption in ilmenite flotation operations.

[0004] The vanadium-titanium magnetite tailings currently used for iron ore beneficiation contain about 13% TFe and 9% TiO2. Because the TiO2 grade of the pre-enriched concentrate can only be increased to 11% to 18% by using a vertical ring pulsating high gradient magnetic separator alone, the TiO2 recovery rate of the pre-enriched concentrate is only 65% ​​to 75%. In addition, with the addition of flotation, the titanium resource recovery rate of vanadium-titanium magnetite is only 15% to 58% (for iron ore beneficiation tailings). Among these, strong magnetic separation and inclined plate desliming are the two major reasons for the waste of titanium resources. Summary of the Invention

[0005] To address the aforementioned problems, this invention provides a system and method for producing titanium concentrate from iron tailings of vanadium-titanium magnetite, which can reduce reagent consumption in ilmenite flotation operations, improve the recovery rate of titanium resources from vanadium-titanium magnetite, and reduce the production cost of titanium concentrate.

[0006] This invention provides a system for producing titanium concentrate from iron tailings of vanadium-titanium magnetite, comprising:

[0007] Hydrocyclone device, high-frequency vibrating screen device, weak magnetic drum magnetic separator device, ball mill, first titanium concentrate separation device and second titanium concentrate separation device;

[0008] Both the first titanium concentrate sorting device and the second titanium concentrate sorting device include:

[0009] A vertical cavity and an inclined cavity are connected by an irregular inverted cone. The vertical cavity is located below the inclined cavity and is connected to a rising water pipe on its outer periphery. The inclined cavity contains inclined plates of the same shape and size. The width of the inclined cavity and all the inclined plates gradually decreases from bottom to top. The inclined cavity has a tailings discharge section at the top. The vertical cavity contains a stirring component. The main body of the vertical cavity is cylindrical and the lower part is conical. A feed pipe is provided on the outer periphery of the main body. A concentrate discharge pipe is provided below the cone. The rising water pipe is used to input water into the vertical cavity and use the input water to push the low-density mineral particles in it to move upward along the inclined plates in the vertical cavity and the inclined cavity, so that the low-density mineral particles are pushed out from the tailings discharge section and the high-density titanomagnetite falls from the concentrate discharge pipe, thereby achieving the enrichment of titanomagnetite.

[0010] The inclined cavities in both the first and second titanium concentrate sorting devices have rectangular cross-sections. The length and width of the lower and upper ports of the inclined cavity in the first titanium concentrate sorting device are greater than those of the lower and upper ports of the inclined cavity in the second titanium concentrate sorting device. The spacing between the inclined plates in the first titanium concentrate sorting device and the width of the lower and upper ends of the inclined plates are greater than those of the lower and upper ends of the inclined plates in the second titanium concentrate sorting device.

[0011] The first titanium concentrate sorting device is used for roughing enriched ilmenite and for scavenging enriched ilmenite in the tailings generated from the roughing enriched ilmenite.

[0012] The second titanium concentrate sorting device is used to adjust the slurry concentration of the first titanium concentrate produced by the roughing of the enriched ilmenite and then perform enriched ilmenite fine sorting.

[0013] Preferably, in the above-mentioned system for producing titanium concentrate from iron tailings of vanadium-titanium magnetite, the inclined cavity in the first titanium concentrate sorting device has a rectangular cross-section, with the lower end of the rectangle having a length of 20cm to 40cm and a width of 12cm to 18cm, and the upper end being a square with a side length of 18cm to 36cm. The spacing between the inclined plates is 2mm to 4mm, and the lower end of the inclined plate is 20cm to 40cm wide and the upper end is 18cm to 36cm wide.

[0014] The inclined cavity in the second titanium concentrate sorting device has a rectangular cross-section, with the lower port having a rectangular length of 5cm to 10cm and a width of 4cm to 8cm, and the upper port being a square with a side length of 4cm to 8cm. The inclined plates are spaced 2mm to 4mm apart, with the lower end of the inclined plate being 5cm to 10cm wide and the upper end being 4cm to 8cm wide.

[0015] Preferably, in the above-described system for producing titanium concentrate from iron tailings of vanadium-titanium magnetite, the length of the inclined cavity and inclined plate in the first titanium concentrate sorting device is 100cm to 200cm and the inclination angle with the horizontal plane is 65° to 75°, and the length of the inclined cavity and inclined plate in the second titanium concentrate sorting device is 100cm to 200cm and the inclination angle with the horizontal plane is 65° to 75°.

[0016] This invention provides a method for producing titanium concentrate from iron ore tailings of vanadium-titanium magnetite, utilizing a system for producing titanium concentrate from iron ore tailings of vanadium-titanium magnetite as described in any of the above claims, comprising:

[0017] S1: Use the high-frequency vibrating screen device to filter tailings from vanadium-titanium magnetite iron ore.

[0018] S2: Use the weak magnetic drum magnetic separator to perform weak magnetic iron removal on the screened product of the slag separator;

[0019] S3: Strong magnetic pre-selection of tailings for weak magnetic iron removal;

[0020] S4: The hydrocyclone device and the high-frequency vibrating screen device are used to perform the first classification of the magnetic concentrate pre-selected by strong magnetics.

[0021] S5: Grind the graded coarse-grained product and the product on the slag screen using the ball mill;

[0022] S6: The high-frequency vibrating screen device is used to perform a second grading of the fine particle product;

[0023] S7: Using the first titanium concentrate sorting device and the second titanium concentrate sorting device, pre-select ilmenite from the graded intermediate products;

[0024] S8: The concentrates produced by the first titanium concentrate sorting device and the second titanium concentrate sorting device are subjected to flotation desulfurization to obtain titanium concentrate and sulfur concentrate, wherein the titanium concentrate is used as the final titanium concentrate.

[0025] S9: Perform a third classification on the middlings produced by the first titanium concentrate sorting device and the second titanium concentrate sorting device;

[0026] S10: The fine-grained product generated from the classification is subjected to flotation desulfurization and titanium beneficiation to obtain titanium concentrate and sulfur concentrate, wherein the titanium concentrate is used as the final titanium concentrate.

[0027] Preferably, in the above method for producing titanium concentrate from iron ore tailings of vanadium-titanium magnetite, the step of using the high-frequency vibrating screen device to filter the tailings of vanadium-titanium magnetite includes:

[0028] A high-frequency vibrating screen with a screen aperture diameter of 1 mm to 1.5 mm is used for slag removal. The undersize product enters step S2, and the oversize product enters step S5.

[0029] Preferably, in the above method for producing titanium concentrate from iron tailings of vanadium-titanium magnetite, a weak magnetic drum magnetic separator with a magnetic field strength of 0.3T to 0.4T is used to weakly magnetically remove iron from the undersize product of the slag separator, thereby removing strongly magnetic minerals, and the tailings enter step S3.

[0030] Preferably, in the above method for producing titanium concentrate from iron tailings of vanadium-titanium magnetite, the step of performing strong magnetic pre-selection on the tailings after weak magnetic iron removal includes:

[0031] S31: For the tailings generated in step S2, a vertical ring pulsating high gradient magnetic separator is used for strong magnetic roughing and pre-enrichment of ilmenite. The magnetic field strength is 0.8T to 1.0T. The magnetic tailings flow by gravity into step S32, and the magnetic concentrate flows into step S4.

[0032] S32: For the magnetic separation tailings generated in step S31, a vertical ring pulsating high gradient magnetic separator is used to perform magnetic separation and pre-enrichment of ilmenite. The magnetic field strength is 0.9T to 1.2T. The magnetic separation tailings are used as the first tailings and the first tailings are used as the final tailings. The resulting magnetic concentrate is pumped into step S4.

[0033] Preferably, in the above method for producing titanium concentrate from iron tailings of vanadium-titanium magnetite, the first classification of the magnetically separated concentrate pre-selected by strong magnetic separation using the hydrocyclone device and the high-frequency vibrating screen device includes:

[0034] S41: The magnetic concentrate produced in step S3 is classified using a hydrocyclone to separate it into hydrocyclone underflow and hydrocyclone overflow. The hydrocyclone underflow flows by gravity into step S5, and the hydrocyclone overflow flows by gravity into step S42.

[0035] S42: The overflow from the hydrocyclone generated in step S41 is classified using a high-frequency vibrating screen with a screen aperture size of 0.25mm. The product on the screen enters step S5, and the product under the screen is pumped into step S43.

[0036] S43: The undersize product generated in step S42 is classified using a hydrocyclone to separate it into hydrocyclone undersand and hydrocyclone overflow. The hydrocyclone undersand flows by gravity into step S7, and the hydrocyclone overflow flows into step S6.

[0037] The second grading of the fine-particle product using the high-frequency vibrating screen device includes:

[0038] The hydrocyclone overflow generated in step S43 is classified using a high-frequency vibrating screen with a screen aperture size of 0.074 mm. The product on the screen enters step S7, and the product under the screen flows by gravity into step S10.

[0039] Preferably, in the above method for producing titanium concentrate from iron tailings of vanadium-titanium magnetite, grinding the graded coarse product and the product on the slag-screening screen using the ball mill includes:

[0040] The oversize product generated in steps S1 and S42 and the hydrocyclone underfill generated in step S41 are ground, and the ground ore discharge is pumped to step S2.

[0041] Preferably, in the above method for producing titanium concentrate from iron tailings of vanadium-titanium magnetite, the step of using the first titanium concentrate sorting device and the second titanium concentrate sorting device to pre-select the graded intermediate product for ilmenite includes:

[0042] S71: The hydrocyclone sediment produced in step S43 and the oversize product produced in step S6 are fed into a mixing tank and water is added to adjust the slurry concentration to 25% to 45%. Then, the slurry is pumped into step S72.

[0043] S72: The first titanium concentrate sorting device is used to enrich ilmenite roughing. In the ore discharge of the sorting step S71, the feeding speed, rising water volume, stirring speed and ore discharge speed of the first titanium concentrate sorting device are adjusted to obtain the first titanium concentrate and the second tailings. The first titanium concentrate is fed into step S73, and the second tailings are fed into step S75 by a pump.

[0044] S73: Add the first titanium concentrate and water to the mixing tank to prepare the slurry. After adjusting the slurry concentration to 25% to 45%, use a pump to feed it into step S74.

[0045] S74: The second titanium concentrate separation device is used to enrich and refine ilmenite. In the ore discharge of the separation step S73, the feeding speed, rising water volume, stirring speed and ore discharge speed of the second titanium concentrate separation device are adjusted to obtain the second titanium concentrate and the third tailings. The second titanium concentrate is sent to step S8 and the third tailings are sent to step S9.

[0046] S75: The first titanium concentrate sorting device is used to enrich ilmenite by scavenging. The second tailings generated in the sorting step S72 are used to adjust the feed rate, water flow rate, stirring speed and discharge rate of the first titanium concentrate sorting device to obtain the third titanium concentrate and the fourth tailings. The third titanium concentrate is sent to step S9 and the fourth tailings are used as the final tailings.

[0047] As described above, the system for producing titanium concentrate from iron ore tailings of vanadium-titanium magnetite provided by this invention, because the first titanium concentrate sorting device is used for enriching ilmenite roughing and for enriching ilmenite scavenging of the tailings generated from the enriched ilmenite roughing, and the second titanium concentrate sorting device is used for enriching ilmenite in the first titanium concentrate generated from the enriched ilmenite roughing after adjusting the pulp concentration, it is evident that using these two titanium concentrate sorting devices allows for the pre-enrichment of ilmenite, thereby significantly reducing the amount of material entering the grinding and flotation operations. Thus, this system can reduce reagent consumption in ilmenite flotation, improve the recovery rate of titanium resources from vanadium-titanium magnetite, and reduce the production cost of titanium concentrate. The method for producing titanium concentrate from iron ore tailings of vanadium-titanium magnetite provided by this invention has the same advantages. Attached Figure Description

[0048] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0049] Figure 1 This is an overall schematic diagram of an embodiment of a system for producing titanium concentrate from iron tailings of vanadium-titanium magnetite provided by the present invention;

[0050] Figure 2 A schematic diagram of a titanium concentrate sorting device used in a system for producing titanium concentrate from iron tailings of vanadium-titanium magnetite provided by the present invention;

[0051] Figure 3 Views of the titanium concentrate sorting unit from different angles;

[0052] Figure 4 This is a schematic diagram of an embodiment of a method for producing titanium concentrate from iron tailings of vanadium-titanium magnetite provided by the present invention;

[0053] Figure 5 A schematic diagram of the process used in the example provided by the present invention. Detailed Implementation

[0054] The core of this invention is to provide a system and method for producing titanium concentrate from iron tailings of vanadium-titanium magnetite, which can reduce reagent consumption in ilmenite flotation operations, improve the recovery rate of titanium resources from vanadium-titanium magnetite, and reduce the production cost of titanium concentrate.

[0055] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0056] An embodiment of the system for producing titanium concentrate from iron tailings of vanadium-titanium magnetite provided by this invention is as follows: Figure 1 As shown, Figure 1 and Figure 2 As shown, Figure 1 This is an overall schematic diagram of an embodiment of a system for producing titanium concentrate from iron tailings of vanadium-titanium magnetite provided by the present invention. Figure 2 This is a schematic diagram of a titanium concentrate separation device used in a system for producing titanium concentrate from iron tailings of vanadium-titanium magnetite provided by the present invention. The system may include:

[0057] Hydrocyclone device A1, high-frequency vibrating screen device A2, weak magnetic drum magnetic separator device A3, ball mill A4, first titanium concentrate separation device A5, and second titanium concentrate separation device A6;

[0058] The first titanium concentrate sorting device A5 and the second titanium concentrate sorting device A6 both include:

[0059] A vertical cavity 1 and an inclined cavity 13 are connected by an irregular inverted cone 9. The vertical cavity 1 is located below the inclined cavity 13 and its outer periphery is connected to a riser pipe 2. The internal space of the vertical cavity 1 is used for the flow, mixing, and separation of water and minerals. The inclined cavity 13 contains inclined plates 14 of the same shape and size. The number of these inclined plates 14 is unlimited. Their function is to use the inclined angle so that, as the water flow carries the mineral particles upwards at an angle, the less dense mineral particles float up. Thus, the water flow can carry these less dense mineral particles continuously upwards until they are discharged from the top. These are the unwanted mineral particles. This refers to tailings. Denser mineral particles cannot be suspended and instead settle on the surface of the inclined plates. Because their gravity is greater than the upward thrust of the water flow, these denser mineral particles continuously slide down the inclined plates until they return to the vertical cavity 1 for further movement, eventually being discharged from the bottom. This is the desired ilmenite. This effectively separates the two types of mineral particles beforehand, reducing the amount of ilmenite entering grinding and flotation, thus reducing the grinding energy and reagent consumption. Furthermore, the width of the inclined cavity 13 and all the inclined plates 14 gradually decreases from bottom to top because the higher up... The less ilmenite there is, the less need there is for the upper part to be wide. A gradually narrowing upper part is more conducive to the accumulation of ilmenite, making it easier for it to slide down. It also allows suspended mineral particles to become more concentrated, facilitating their flow out from the top. The inclined cavity 13 has a tailings discharge section C above it, through which suspended low-density mineral particles are discharged, achieving separation from the ilmenite. The vertical cavity 1 houses a stirring component D, enabling effective separation of the various mineral particles within it. The main body of the vertical cavity 1 is cylindrical with a conical lower part 3. This conical part 3 acts as a transition, allowing the internal space to flow from top to bottom. The structure gradually shrinks downwards, eventually becoming a thin tube, as long as the ilmenite can be discharged. A feed pipe 8 is provided on the outer periphery of the main body, from which the minerals to be separated can be fed into the main body. A concentrate discharge pipe 4 is provided below the cone 3, from which the separated titanium concentrate can be discharged, achieving effective separation. The rising water pipe 2 is used to input water into the vertical cavity 1 and use the input water to push the low-density mineral particles in it upwards along the inclined plate 14 in the vertical cavity 1 and the inclined cavity 13, so that the low-density mineral particles are pushed out from the tailings discharge section C, and the high-density ilmenite falls down from the concentrate discharge pipe 4, achieving the enrichment of ilmenite.

[0060] refer to Figure 3 , Figure 3 These are different angle views of the titanium concentrate sorting device. The inclined cavity 13 in both the first titanium concentrate sorting device A5 and the second titanium concentrate sorting device A6 has a rectangular cross-section, as shown below. Figure 3In the diagram, section AA' is the lower section of the inclined cavity, while section BB' is the upper section of the inclined cavity. Figure 3 The third figure (301) shows the shape of the inclined cavity, i.e., the inclined plate. The fourth figure (302) shows the view of the inclined cavity along the inclination direction of the inclined plate. It can be clearly seen that the inclined plates are arranged from bottom to top inside the inclined cavity. There is a certain height gap between adjacent inclined plates to allow mineral particles of corresponding size to pass through. The length and width of the lower and upper ports of the inclined cavity in the first titanium concentrate sorting device A5 are greater than the length and width of the lower and upper ports of the inclined cavity in the second titanium concentrate sorting device A6, respectively. The spacing of the inclined plates in the first titanium concentrate sorting device A5 and the width of the lower and upper ends of the inclined plates are greater than the spacing of the inclined plates in the second titanium concentrate sorting device A6 and the width of the lower and upper ends of the inclined plates, respectively. In this way, the two can sort mineral particles of different sizes respectively.

[0061] The first titanium concentrate sorting unit A5 is used for the roughing of enriched ilmenite and the scavenging of enriched ilmenite in the tailings produced by the roughing of enriched ilmenite. It should be noted that some ilmenite will still be present in the tailings produced by the roughing of enriched ilmenite, so a scavenging is performed here to avoid wasting useful ilmenite.

[0062] The second titanium concentrate sorting unit A6 is used to refine the first titanium concentrate produced by the roughing of enriched ilmenite after adjusting the pulp concentration. It should be noted that this can obtain the final titanium concentrate required. Then, if these pre-sorted titanium concentrates are used for subsequent processes, the corresponding throughput can be reduced. Less throughput means less flotation reagents are needed, and energy consumption in grinding and other steps can also be reduced. It can be seen that this brings many benefits.

[0063] As described above, in the embodiments of the system for producing titanium concentrate from iron tailings of vanadium-titanium magnetite provided by the present invention, the first titanium concentrate sorting device is used for enriching ilmenite roughing and for enriching ilmenite scavenging of the tailings generated from the enriching ilmenite roughing, and the second titanium concentrate sorting device is used for enriching ilmenite after adjusting the pulp concentration of the first titanium concentrate generated from the enriching ilmenite roughing. It can be seen that the use of these two titanium concentrate sorting devices can enrich ilmenite in advance, thereby significantly reducing the amount of material entering the grinding and flotation operations. Thus, the system can reduce the reagent consumption of ilmenite flotation operations, improve the recovery rate of titanium resources from vanadium-titanium magnetite, and reduce the production cost of titanium concentrate.

[0064] In a specific embodiment of the above-mentioned system for producing titanium concentrate from iron tailings of vanadium-titanium magnetite, the inclined cavity in the first titanium concentrate sorting device A5 has a rectangular cross-section, with the lower port having a rectangular length of 20cm to 40cm and a width of 12cm to 18cm, and the upper port being a square with a side length of 18cm to 36cm. The inclined plates are spaced 2mm to 4mm apart, with the lower end of the inclined plates being 20cm to 40cm wide and the upper end being 18cm to 36cm wide.

[0065] The inclined cavity in the second titanium concentrate sorting device has a rectangular cross-section, with the lower end of the rectangle having a length of 5cm to 10cm and a width of 4cm to 8cm, and the upper end being a square with a side length of 4cm to 8cm. The inclined plates are spaced 2mm to 4mm apart, with the lower end of the inclined plates having a width of 5cm to 10cm and the upper end having a width of 4cm to 8cm.

[0066] When selecting various dimensions, it is important to ensure that the upper port dimension of the inclined cavity is smaller than the lower port dimension, and the same applies to the inclined plate.

[0067] In another specific embodiment of the system for producing titanium concentrate from iron tailings of vanadium-titanium magnetite, the length of the inclined cavity and inclined plate in the first titanium concentrate sorting device A5 is 100cm to 200cm, more preferably 150cm, and the inclination angle with the horizontal plane is 65° to 75°, more preferably 70°. Similarly, the length of the inclined cavity and inclined plate in the second titanium concentrate sorting device A6 is 100cm to 200cm, more preferably 150cm, and the inclination angle with the horizontal plane is 65° to 75°, more preferably 70°. Furthermore, the size and inclination angle of the inclined plate must match the size and inclination angle of the inclined cavity in which it is located. Furthermore, the body of the vertical cavity 1 can be a cylinder with a diameter of 30cm to 50cm and a height of 50cm to 70cm. More preferably, its diameter is 40cm and its height is 60cm. Of course, these can be selected according to actual needs and are not limited here. The height of the irregular inverted cone 9 can be 15cm to 25cm, more preferably 20cm, and the angle between its farthest point of the cone surface and the horizontal direction is 30° to 60°, more preferably 45°. The angle between its closest point of the cone surface and the horizontal direction is 75° to 85°, more preferably 80°. It can be detachably connected to the lower vertical cavity 1 and the upper inclined cavity. The rising water pipes 2 are set at the connection between the body and the cone 3, and the number can be 6 to 8, preferably 8. The diameter is 1cm to 2cm, preferably 1.5cm, and they are evenly distributed along the outer periphery of the cone, so that the flow rate in different directions is more uniform. Of course, the flow rate in each water pipe can be controlled individually. The angle between the cone surface of cone 3 and the horizontal plane can be 50° to 70°, preferably 60°. The diameter of concentrate discharge pipe 4 can be 1cm to 2cm, preferably 1.5cm. Concentrate discharge pipe 4 can also be equipped with concentrate discharge valve 5. It also includes a discharge water supply pipe 6 located at the connection between concentrate discharge pipe 4 and cone, with a diameter preferably 1cm, which can control the water flow rate and replenish water according to actual needs to prevent blockage during discharge. The tailings discharge section C can include a tailings collection tank 12 and a tailings discharge pipe 11 with a diameter of 2cm to 4cm, preferably 3cm. This tailings collection tank 12 can temporarily store tailings to prevent congestion and blockage of the tailings discharge pipe. The stirring component D can include a stirring impeller 7 and a stirring shaft 6 and a transmission component 15 connected to it, so as to stir the mineral particles in the vertical cavity to make them evenly dispersed and easy to move. The feed pipe 8 is positioned at the middle height of the main body and has a diameter of 1cm to 2cm, preferably 1.5cm. (Continue to refer to...) Figure 2 It may also include a frame 10 for supporting the vertical cavity 1 and the inclined cavity 13, thus improving the overall stability of the equipment and preventing it from tilting or falling over.

[0068] An embodiment of the method for producing titanium concentrate from iron tailings of vanadium-titanium magnetite provided by this invention is as follows: Figure 4 As shown, Figure 4 This is a schematic diagram of an embodiment of a method for producing titanium concentrate from iron tailings of vanadium-titanium magnetite provided by the present invention. The system for producing titanium concentrate from iron tailings of vanadium-titanium magnetite as described above may include the following steps:

[0069] S1: Using a high-frequency vibrating screen device to filter tailings from vanadium-titanium magnetite iron ore beneficiation.

[0070] Specifically, this step may include: using a high-frequency vibrating screen with a screen hole diameter of 1mm to 1.5mm to separate the slag, with the undersize product entering step S2 and the oversize product entering step S5.

[0071] S2: Use a weak magnetic drum magnetic separator to remove iron from the screened product after slag removal using a weak magnetic field.

[0072] Specifically, a weak magnetic drum magnetic separator with a magnetic field strength of 0.3T to 0.4T can be used to weakly magnetically remove iron from the undersize product of the slag separator, removing strongly magnetic minerals. The tailings then enter step S3. Of course, the magnetic field strength can be adjusted according to the actual type of mineral, which is not limited here.

[0073] S3: Strong magnetic pre-selection of tailings for weak magnetic iron removal;

[0074] Specifically, this step may include the following sub-steps:

[0075] S31: For the tailings generated in step S2, a vertical ring pulsating high gradient magnetic separator is used for strong magnetic roughing and pre-enrichment of ilmenite. The magnetic field strength is 0.8T to 1.0T. The magnetic tailings flow by gravity into step S32, and the magnetic concentrate flows into step S4.

[0076] S32: For the magnetic separation tailings generated in step S31, a vertical ring pulsating high gradient magnetic separator is used for magnetic scavenging and pre-enrichment of ilmenite. The magnetic field strength is 0.9T to 1.2T. The magnetic separation tailings are used as the first tailings and the first tailings are used as the final tailings. The obtained magnetic concentrate is pumped into step S4. It can be seen that the magnetic field strength in this step is higher than that in the previous sub-step. This allows for further selection of the titanium concentrate in the magnetic separation tailings of the previous sub-step. Of course, the magnetic field strength can also be adjusted according to actual needs, which is not limited here.

[0077] S4: The first classification of the magnetic concentrate pre-selected by strong magnetic separation is carried out using a hydrocyclone device and a high-frequency vibrating screen device.

[0078] Specifically, this step may include:

[0079] S41: The magnetic concentrate produced in step S3 is classified using a hydrocyclone to separate it into hydrocyclone underflow and hydrocyclone overflow. The hydrocyclone underflow flows by gravity into step S5, and the hydrocyclone overflow flows by gravity into step S42.

[0080] S42: The hydrocyclone overflow generated in step S41 is classified using a high-frequency vibrating screen with a screen aperture size of 0.25mm. The product on the screen enters step S5, and the product under the screen is pumped into step S43.

[0081] S43: The undersize product generated in step S42 is classified using a hydrocyclone and divided into hydrocyclone undersand and hydrocyclone overflow. The hydrocyclone undersand flows by gravity into step S7, and the hydrocyclone overflow flows into step S6.

[0082] S5: Use a ball mill to grind the graded coarse particles and the product on the slag screen;

[0083] Specifically, this step may include:

[0084] The oversize product generated in steps S1 and S42 and the hydrocyclone underfill generated in step S41 are ground, and the ground ore discharge is pumped to step S2.

[0085] S6: Use a high-frequency vibrating screen device to perform a second grading of the fine particle product;

[0086] Specifically, this step may include:

[0087] The hydrocyclone overflow generated in step S43 is classified using a high-frequency vibrating screen with a screen aperture size of 0.074 mm. The product on the screen enters step S7, and the product under the screen flows by gravity into step S10.

[0088] S7: Using the first titanium concentrate sorting device and the second titanium concentrate sorting device, pre-select ilmenite from the graded intermediate products;

[0089] Specifically, this step may include:

[0090] S71: The hydrocyclone sediment produced in step S43 and the oversize product produced in step S6 are fed into a mixing tank and water is added to adjust the slurry concentration to 25% to 45%. Then, the slurry is pumped into step S72.

[0091] S72: The first titanium concentrate sorting device is used to carry out the roughing of enriched ilmenite. The discharge of the sorting step S71 is adjusted by adjusting the feeding speed, rising water volume, stirring speed and discharge speed of the first titanium concentrate sorting device to obtain the first titanium concentrate and the second tailings. The first titanium concentrate is fed into step S73, and the second tailings are fed into step S75 by a pump.

[0092] S73: Add the first titanium concentrate and water to the mixing tank to prepare the slurry. After adjusting the slurry concentration to 25% to 45%, use a pump to feed it into step S74.

[0093] S74: The second titanium concentrate separation device is used to enrich and refine ilmenite. In the ore discharge of the separation step S73, the feed rate, rising water volume, stirring speed and discharge rate of the second titanium concentrate separation device are adjusted to obtain the second titanium concentrate and the third tailings. The second titanium concentrate is sent to step S8 and the third tailings are sent to step S9.

[0094] S75: The first titanium concentrate sorting device is used to enrich ilmenite. The second tailings generated in the sorting step S72 are used to adjust the feed rate, water flow rate, stirring speed and discharge rate of the first titanium concentrate sorting device to obtain the third titanium concentrate and the fourth tailings. The third titanium concentrate is sent to step S9 and the fourth tailings are used as the final tailings.

[0095] S8: The concentrates produced by the first titanium concentrate sorting unit and the second titanium concentrate sorting unit are subjected to flotation desulfurization to obtain titanium concentrate and sulfur concentrate, with the titanium concentrate being the final titanium concentrate.

[0096] Specifically, sulfuric acid, butyl xanthate, No. 2 oil, and other reagents can be added to the flotation machine to desulfurize the second titanium concentrate. The flotation desulfurization process consists of one roughing stage, two scavenging stages, two cleaning stages, and middlings being returned to the closed-circuit process in sequence to obtain the second sulfur concentrate and the fifth titanium concentrate. The fifth titanium concentrate is the final concentrate.

[0097] S9: Perform a third classification on the middlings produced by the first titanium concentrate sorting unit and the second titanium concentrate sorting unit;

[0098] Specifically, step S91 can be performed first: hydrocyclone classification, which separates the third tailings and the third titanium concentrate into hydrocyclone underflow and hydrocyclone overflow. The hydrocyclone underflow flows by gravity into operation S5, and the hydrocyclone overflow flows into operation S92.

[0099] S92: The hydrocyclone overflow generated in step S91 is classified by a high-frequency vibrating screen with a screen aperture size of 0.10mm. The product on the screen enters step S5, and the product under the screen is fed into step S10.

[0100] S10: The fine-grained products generated from the classification are subjected to flotation desulfurization and titanium beneficiation to obtain titanium concentrate and sulfur concentrate, with the titanium concentrate serving as the final titanium concentrate.

[0101] Specifically, this may include the following sub-steps:

[0102] S101: Add sulfuric acid, butyl xanthate, No. 2 oil and other reagents to the flotation machine to desulfurize the undersize products of steps S6 and S9. The flotation desulfurization process is a one-stage roughing, two-stage cleaning, two-stage scavenging, and middlings are returned to the closed-circuit process in sequence to obtain the first sulfur concentrate and desulfurized tailings. The desulfurized tailings enter step S102.

[0103] S102: Add sulfuric acid, diesel oil, MOH, and high-quality titanium reagents to the flotation machine to perform titanium flotation on the desulfurization tailings from the S101 operation. The titanium flotation process is a closed-circuit process consisting of one roughing stage, two scavenging stages, three cleaning stages, and middlings returned sequentially, to obtain the fourth titanium concentrate and the fifth tailings. The fourth titanium concentrate is used as the final concentrate, and the fifth tailings are used as the final tailings.

[0104] In summary, the method provided by this invention can significantly reduce the amount of material entering the grinding and flotation operations, thereby reducing the reagent consumption in the ilmenite flotation operation, improving the recovery rate of titanium resources in vanadium-titanium magnetite, and reducing the production cost of titanium concentrate.

[0105] The above method will be explained in detail with a specific example below:

[0106] The main physicochemical parameters of the ore used in this example are as follows:

[0107] The iron tailings sample contained 14.25% TFe, 9.22% TiO2, 0.02% V2O5, 43.32% SiO2, 10.22% CaO, 7.35% MgO, 4.28% Al2O3, 0.13% MnO, and 0.25% S. 63.11% of the sample was of material with a diameter of -0.074 mm. The sample contained 37.27% pyroxene, 25.08% ilmenite, 9.60% labradorite, 9.38% amphibole, 4.58% olivine, 3.95% anorthite, 2.94% titanomagnetite, 1.74% albite, 1.24% sphene, and 0.96% pyrrhotite, with other minerals present in smaller quantities. The degree of liberation of ilmenite was 88.09%.

[0108] refer to Figure 5 , Figure 5 The process diagram used in the example provided by the present invention is as follows:

[0109] (1) Slag separation: Add the dry iron tailings to the hopper of a 10cm×10cm pendulum feeder, adjust the valve of the pendulum feeder to feed 100kg / h, add water to adjust the concentration to 40%, and feed it into the KM-800-4S high frequency vibrating screen for slag separation using a vertical sand pump. The screen hole diameter is 1.2mm, and the product on the screen flows into the operation (7).

[0110] (2) Weak magnetic roughing to remove iron: The undersize product is fed into an XCRS-ф400×300 drum magnetic separator with a magnetic field strength of 3500 Oe. The magnetic concentrate is used as secondary iron concentrate, and the magnetic tailings are fed into the operation by a vertical sand pump (3).

[0111] (3) Strong magnetic roughing pre-enrichment of ilmenite: Adjust the magnetic field strength of the SLon500-1.5T vertical ring pulsating high gradient magnetic separator to 0.9T, stroke to 35mm, stroke to 350 times / min, and ring rotation to 2.5rad / min for strong magnetic separation. The tailings obtained from strong magnetic separation enter operation (4), and the concentrate from strong magnetic separation enters operation (5).

[0112] (4) Strong magnetic scavenging pre-enrichment of ilmenite: The tailings of the strong magnetic roughing are recovered by using a SLon500-1.5T vertical ring pulsed high gradient magnetic separator. The magnetic field strength is adjusted to 1.1T, the stroke is 25mm, the stroke is 300 times / min, and the ring rotation is 3.0rad / min. The strong magnetic separation tailings are used as tailings 1. Tailings 1 are used as the final tailings. The strong magnetic separation concentrate enters (5) operation.

[0113] (5) Hydrocyclone grading: (3) and (4) strong magnetic concentrate are fed into φ25mm hydrocyclone by pump, the sediment flows into operation (7) by gravity, and the overflow flows into operation (6) by gravity.

[0114] (6) High-frequency vibrating screen grading: (5) The overflow of the hydrocyclone is screened using a KM-800-4S high-frequency vibrating screen with a screen hole diameter of 0.25mm. The product on the screen flows into the operation (7) by gravity, and the product under the screen is pumped to the operation (8).

[0115] (7) Grinding: The products on the screens of (1) and (6) and the cyclone sediment of (5) flow into the XMB-ф420×600 type continuous ball mill by gravity, and the mill discharge pump sends it to (2) operation;

[0116] (8) Hydrocyclone grading: φ25 hydrocyclone is used for grading the undersize product in (6) medium screen. The sediment from the hydrocyclone flows into (10) operation by gravity, and the overflow from the hydrocyclone flows into (9) operation by gravity.

[0117] (9) High-frequency vibrating screen grading: (8) The overflow of the hydrocyclone is screened using a KM-800-4S ultrasonic high-frequency vibrating screen with a screen hole diameter of 0.074mm. The product on the screen flows into operation (10) by gravity, and the product under the screen flows into operation (17) by gravity.

[0118] (10) Slurry preparation: Using an XDT-15L mixing tank, water is added to adjust the concentration to 30% for the hydrocyclone sediment in (8) and the product on the high-frequency screen in (9). The mixing tank is fed into the ore discharge pump (11).

[0119] (11) Enriching ilmenite roughing using the first titanium concentrate sorting device: The discharge of the sorting (10) has a slant plate spacing of 3 mm. Adjust the parameters such as the feeding speed, rising water volume, stirring speed, and discharge speed of the first titanium concentrate sorting device to obtain titanium concentrate 1 and tailings 2. Titanium concentrate 1 is fed into operation (12), and tailings 2 is fed into operation (14) by a pump.

[0120] (12) Adjust the slurry concentration: Add titanium concentrate 1 and water to the mixing tank to adjust the slurry concentration to 30% and then use a pump to feed it into the (13) operation.

[0121] (13) Enriching and refining ilmenite using the second titanium concentrate sorting device: The spacing between the inclined plates is 3mm. Adjust the parameters such as the feeding speed, rising water volume, stirring speed, and discharge speed of the second titanium concentrate sorting device to obtain titanium concentrate 2 and tailings 3. Titanium concentrate 2 enters operation (19), and tailings 3 is fed into operation (15).

[0122] (14) Enriching ilmenite using the first titanium concentrate sorting device: The spacing between the inclined plates is 3mm. Adjust the parameters such as the feeding speed, rising water volume, stirring speed, and discharge speed of the first titanium concentrate sorting device to obtain titanium concentrate 3 and tailings 4. Titanium concentrate 3 is fed into operation (15), and tailings 4 is used as the final tailings.

[0123] (15) Hydrocyclone classification: Tailings 3 and titanium concentrate 3 are divided into hydrocyclone underflow and hydrocyclone overflow. Hydrocyclone underflow flows into (7) operation by gravity, and hydrocyclone overflow flows into (16) operation.

[0124] (16) High-frequency vibrating screen grading: (15) The overflow of the hydrocyclone is graded by a high-frequency vibrating screen with a screen hole size of 0.10mm. The product on the screen enters (7) operation, and the product under the screen is fed into (17) operation.

[0125] (17) Flotation desulfurization: Add sulfuric acid, butyl xanthate, No. 2 oil and other reagents to the flotation machine to desulfurize the undersize products of (9) and (16) operations. The flotation desulfurization process is a closed-loop process of one roughing stage, two cleaning stages, two scavenging stages, and middlings returned in sequence to obtain sulfur concentrate 1 and desulfurized tailings. The desulfurized tailings enter (18) operation.

[0126] (18) Titanium flotation: Add sulfuric acid, diesel oil, MOH, high-quality titanium and other reagents to the flotation machine to carry out titanium flotation on the desulfurization tailings of (17) operation. The titanium flotation process is a closed-loop process of one roughing stage, two scavenging stages, three cleaning stages, and middlings returned in sequence to obtain titanium concentrate 4 and tailings 5. Titanium concentrate 4 is used as the final concentrate and tailings 5 ​​is used as the final tailings.

[0127] (19) Flotation desulfurization: Add sulfuric acid, butyl xanthate, No. 2 oil and other reagents to the flotation machine to desulfurize the titanium concentrate 2 in (13). The flotation desulfurization process is a roughing process, a scavenging process, a cleaning process, and the middlings are returned to the closed circuit in sequence to obtain sulfur concentrate 2 and titanium concentrate 5. Titanium concentrate 5 is the final concentrate.

[0128] Table 1 shows the results obtained in this example. Using the above system and method, the iron tailings can be processed to obtain a total titanium concentrate with a yield of 11.85%, containing 47.61% TiO2 and a TiO2 recovery rate of 61.19%. Compared with conventional processes, the TiO2 recovery rate of titanium concentrate is increased by 3 to 6 percentage points.

[0129] Table 1 Results of the above examples

[0130]

[0131] In summary, the titanium concentrate beneficiation process using vanadium-titanium magnetite tailings containing 13%±TFe and 9%±TiO2 is costly due to the high cost of using a single vertical ring pulsating high gradient magnetic separator for strong magnetic separation, flotation desulfurization, and flotation titanium beneficiation. Furthermore, the process is limited by the upper limit of flotation particle size, requiring fine grinding which results in a relatively low TiO2 recovery rate. Issues such as increasing the enrichment ratio of ilmenite in the strong magnetic separation process, meeting flotation particle size requirements, high grinding costs, loss of fine ilmenite particles, and high reagent consumption in the flotation process mean that the direct cost of titanium concentrate is typically greater than 450 yuan / t. Additionally, the flotation process requires a large amount of flotation reagents, leading to significant pressure on process control and environmental safety. The method for producing titanium concentrate from vanadium-titanium magnetite iron ore tailings provided in this application, combined with high-frequency vibrating screens, ball mills, vertical ring pulsating high-gradient magnetic separators, hydrocyclones, weak magnetic separators, and flotation machines, involves a process of vanadium-titanium magnetite iron ore tailings-slag separation-weak magnetic iron removal-strong magnetic pre-enrichment of ilmenite-hydrocyclone + high-frequency screen classification-coarse grinding and return to slag separation-fine particle hydrocyclone + high-frequency screen classification-medium and fine particles enriched with titanium concentrate using a titanium concentrate separation device-fine particles recovered by flotation. This process significantly reduces the amount of material entering the ilmenite flotation operation and reduces flotation reagent consumption. It has the advantages of relatively low cost and easy industrialization, and can be widely applied to the recovery of ilmenite from vanadium-titanium magnetite iron ore tailings, possessing significant practical and promotional value.

[0132] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A system for producing titanium concentrate from vanadium titano-magnetite iron ore tailings, characterized by, The application relates to a titanium concentrate separation device, which comprises a hydrocyclone device, a high-frequency vibration screen device, a weak-magnetic cylinder type magnetic separator device, a ball mill, a first titanium concentrate separation device and a second titanium concentrate separation device. The first titanium concentrate separation device and the second titanium concentrate separation device both comprise: The irregular inverted cone is connected with a vertical cavity and an inclined cavity, the vertical cavity is located below the inclined cavity and is connected with an ascending water pipe at the outer periphery, the inclined cavity contains inclined plates with the same shape and size, the width of the inclined cavity and all the inclined plates gradually decreases from bottom to top, the inclined cavity is provided with a tailing discharge part at the top, the vertical cavity contains a stirring part, the body of the vertical cavity is a cylinder and the lower part is a cone, the outer periphery of the body is provided with a feeding pipe, the lower part of the cone is provided with a concentrate discharge pipe, the ascending water pipe is used for inputting water into the vertical cavity and pushing the low-density mineral particles in the vertical cavity to move upwards along the inclined plates in the vertical cavity and the inclined cavity, so that the low-density mineral particles are pushed out from the tailing discharge part and the high-density titanium magnetite falls from the concentrate discharge pipe, thereby realizing enrichment of the titanium magnetite. The inclined cavities in the first titanium concentrate separation device and the second titanium concentrate separation device both have a rectangular cross section, the length and width of the lower port and the upper port of the inclined cavity in the first titanium concentrate separation device are greater than those of the inclined cavity in the second titanium concentrate separation device, and the interval between the inclined plates, the width of the lower end and the upper end of the inclined plates in the first titanium concentrate separation device are greater than those in the second titanium concentrate separation device. The first titanium concentrate separation device is used for rough enrichment of ilmenite and sweep enrichment of tailings generated in the rough enrichment of ilmenite. The second titanium concentrate separation device is used for fine enrichment of ilmenite after adjusting the pulp concentration of the first titanium concentrate generated in the rough enrichment of ilmenite. The inclined cavity in the first titanium concentrate separation device has a rectangular cross section, the rectangular length of the lower port is 20-40 cm, the width is 12-18 cm, the upper port is a square with a side length of 18-36 cm, the interval between the inclined plates is 2-4 mm, the width of the lower end of the inclined plates is 20-40 cm, and the width of the upper end is 18-36 cm.

2. The system for producing titanium concentrate from vanadium titano-magnetite iron ore tailings according to claim 1, characterized in that, The inclined cavity in the second titanium concentrate separation device has a rectangular cross section, the rectangular length of the lower port is 5-10 cm, the width is 4-8 cm, the upper port is a square with a side length of 4-8 cm, the interval between the inclined plates is 2-4 mm, the width of the lower end of the inclined plates is 5-10 cm, and the width of the upper end is 4-8 cm. ​ 3. The system for producing titanium concentrate from vanadium titano-magnetite iron ore tailings according to claim 2, characterized in that, The length of the inclined cavity and the inclined plate in the first titanium concentrate sorting device is 100-200 cm, and the angle between the inclined cavity and the inclined plate and the horizontal plane is 65-75°, and the length of the inclined cavity and the inclined plate in the second titanium concentrate sorting device is 100-200 cm, and the angle between the inclined cavity and the inclined plate and the horizontal plane is 65-75°.

4. A process for producing titanium concentrate from vanadium titano-magnetite iron ore tailings, characterized by, The system for producing titanium concentrate from vanadium-titanium magnetite iron separation tailings according to any one of claims 1-3, comprising: S1: using the high-frequency vibrating screen device to separate slag from vanadium-titanium magnetite iron separation tailings; S2: using the weak magnetic drum magnetic separator device to remove iron from the undersize product of the separated slag by weak magnetism; S3: pre-concentrating the tailings removed by weak magnetism by strong magnetism; S4: using the hydrocyclone device and the high-frequency vibrating screen device to perform first classification on the magnetic separation concentrate pre-concentrated by strong magnetism; S5: using the ball mill to grind the classified coarse particle product and the oversize product of the separated slag; S6: using the high-frequency vibrating screen device to perform second classification on the classified fine particle product; S7: using the first titanium concentrate sorting device and the second titanium concentrate sorting device to pre-concentrate ilmenite from the classified intermediate product; S8: obtaining titanium concentrate and sulfur concentrate by flotation desulfurization on the concentrate produced by the first titanium concentrate sorting device and the second titanium concentrate sorting device, and the titanium concentrate as the final titanium concentrate; S9: performing third classification on the middlings produced by the first titanium concentrate sorting device and the second titanium concentrate sorting device; S10: obtaining titanium concentrate and sulfur concentrate by flotation desulfurization and titanium selection on the fine particle product produced by classification, and the titanium concentrate as the final titanium concentrate.

5. The method for producing titanium concentrate from vanadium-titanium magnetite iron removal tailings according to claim 4, characterized in that, The step of using the high-frequency vibrating screen device to separate slag from vanadium-titanium magnetite iron separation tailings comprises: Using a high-frequency vibrating screen with a screen hole diameter of 1-1.5 mm to separate slag, the undersize product enters step S2, and the oversize product enters step S5.

6. The method for producing titanium concentrate from vanadium-titanium magnetite iron removal tailings according to claim 5, characterized in that, Using a weak magnetic drum magnetic separator device with a magnetic field strength of 0.3-0.4 T to remove iron from the undersize product of the separated slag by weak magnetism, removing strong magnetic minerals, and the tailings entering step S3.

7. The method for producing titanium concentrate from vanadium-titanium magnetite iron removal tailings according to claim 6, characterized in that, The step of pre-concentrating the tailings removed by weak magnetism by strong magnetism comprises: S31: using a vertical ring pulsating high gradient magnetic separator to pre-concentrate ilmenite by strong magnetism on the tailings produced in step S2, the magnetic field strength being 0.8-1.0 T, the magnetic separation tailings flowing into step S32, and the magnetic separation concentrate entering step S4; S32: using a vertical ring pulsating high gradient magnetic separator to pre-concentrate ilmenite by strong magnetism on the magnetic separation tailings produced in step S31, the magnetic field strength being 0.9-1.2 T, the magnetic separation tailings being the first tailings, the first tailings being the final tailings, and the obtained magnetic separation concentrate being fed into step S4 by a pump.

8. The method for producing titanium concentrate from vanadium-titanium magnetite iron separation tailings according to claim 7, wherein The step of using the hydrocyclone device and the high-frequency vibrating screen device to perform first classification on the magnetic separation concentrate pre-concentrated by strong magnetism comprises: S41: the magnetic separation concentrate produced in step S3 is classified by a hydrocyclone into cyclone underflow and cyclone overflow, the cyclone underflow flows into step S5, and the cyclone overflow flows into step S42; S42: the cyclone overflow produced in step S41 is classified by a high-frequency vibrating screen, the screen size is 0.25 mm, the screen overflow is fed into step S5, and the screen underflow is pumped into step S43; S43: the screen underflow produced in step S42 is classified by a hydrocyclone into cyclone underflow and cyclone overflow, the cyclone underflow flows into step S7, and the cyclone overflow flows into step S6; the second classification of the classified fine particle product by the high-frequency vibrating screen device comprises: the cyclone overflow produced in step S43 is classified by a high-frequency vibrating screen, the screen size is 0.074 mm, the screen overflow is fed into step S7, and the screen underflow flows into step S10.

9. The method for producing titanium concentrate from vanadium-titanium magnetite iron removal tailings according to claim 8, characterized in that, the grinding of the classified coarse particle product and the screen overflow by the ball mill comprises: the screen overflows produced in steps S1 and S42 and the cyclone underflow produced in step S41 are ground, and the ground product is pumped into step S2.

10. The method for producing titanium concentrate from vanadium-titanium magnetite iron removal tailings according to claim 9, characterized in that, the pre-concentration of the classified intermediate product by the first ilmenite concentrate separation device and the second ilmenite concentrate separation device comprises: S71: the cyclone underflow produced in step S43 and the screen overflow produced in step S6 are fed into a stirring barrel, water is added to adjust the pulp concentration to 25% to 45%, and then the product is pumped into step S72; S72: the first ilmenite concentrate separation device is used to conduct rough concentration of ilmenite, the product of step S71 is classified, the feeding speed, the rising water amount, the stirring speed, and the discharge speed of the first ilmenite concentrate separation device are adjusted, the first ilmenite concentrate and the second tailings are obtained, the first ilmenite concentrate is fed into step S73, and the second tailings are pumped into step S75; S73: the first ilmenite concentrate and water are added to the stirring barrel to adjust the pulp concentration to 25% to 45%, and then the product is pumped into step S74; S74: the second ilmenite concentrate separation device is used to conduct concentration of ilmenite, the product of step S73 is classified, the feeding speed, the rising water amount, the stirring speed, and the discharge speed of the second ilmenite concentrate separation device are adjusted, the second ilmenite concentrate and the third tailings are obtained, the second ilmenite concentrate is fed into step S8, and the third tailings are fed into step S9; S75: the first ilmenite concentrate separation device is used to conduct scavenging concentration of ilmenite, the second tailings produced in step S72 are classified, the feeding speed, the rising water amount, the stirring speed, and the discharge speed of the first ilmenite concentrate separation device are adjusted, the third ilmenite concentrate and the fourth tailings are obtained, the third ilmenite concentrate is fed into step S9, and the fourth tailings are used as the final tailings.

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