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

Abstract

The invention discloses a system for efficiently 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 and a titanium concentrate separation device. An inclined cavity in the titanium concentrate separation device is provided with a rectangular cross section, and an ascending water pipe is used for inputting water into a vertical cavity and pushing low-density mineral particles in the ascending water pipe to move upwards along inclined plates in the vertical cavity and the inclined cavity through the input water, so that the low-density mineral particles are pushed out of a tailing discharging part. And the high-density titanomagnetite falls down from the concentrate discharging pipe, enrichment of the titanomagnetite is achieved, and the method is used for roughing of the enriched ilmenite and scavenging of the enriched ilmenite for generated tailings. The system can simplify the whole titanium concentrate production process, reduce the number of production equipment and reduce the titanium concentrate production cost. The invention further discloses a method for efficiently producing the titanium concentrate through the vanadium titano-magnetite iron dressing tailings. The method has the same advantages.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of comprehensive utilization of vanadium-titanium magnetite, and particularly relates to a system and method for efficiently producing titanium concentrate from iron tailings of vanadium-titanium magnetite. BACKGROUND

[0002] Titanium is an important and rare strategic metal, which has a series of excellent properties such as high specific strength, light weight, corrosion resistance, shape memory, ductility, good biocompatibility, superconductivity and strong surface decoration, and cannot be compared with other metals. Titanium metal is called the "third metal" after iron and aluminum. TiO2 is the best white inorganic pigment, which is widely used in the industries of coatings, plastics, chemical fibers, rubber, papermaking, printing ink, cosmetics, etc. The main titanium-containing minerals with industrial value in nature are ilmenite and rutile, and about 93.42% of titanium resources (calculated as TiO2) exist in the form of ilmenite.

[0003] The titanium resources are recovered from the iron tailings of vanadium-titanium magnetite, and the process has been innovated from spiral chute gravity separation-flotation desulfurization-drying-electric selection of titanium to the currently widely used strong magnetic separation (+ spiral chute gravity separation)-flotation desulfurization-flotation of titanium. At present, the TiO2 grade of the material entering the flotation desulfurization and titanium selection operation is generally 11% to 18%, and the TiO2 grade of the flotation ilmenite concentrate is generally 45% to 47%. A large amount of sulfuric acid and other flotation reagents need to be added, and high acidity will cause high consumption of flotation reagents, serious corrosion of equipment and pipelines, etc. Therefore, it is urgent to develop a method for producing titanium concentrate at low cost and reducing the consumption of ilmenite flotation reagents.

[0004] The iron tailings of vanadium-titanium magnetite currently used contain about 13% TFe and 9% TiO2. The TiO2 grade of the pre-concentrate can only be increased to 11% to 18% by using a single vertical ring pulsating high gradient magnetic separator, and the recovery rate of the TiO2 pre-concentrate is only 65% to 75%. In addition, the flotation operation is required, so that the recovery rate of titanium resources from vanadium-titanium magnetite is only 15% to 58% (for iron tailings). The current titanium concentrate production method includes a very complicated process and requires a large number of equipment, which results in low production efficiency and high equipment cost. SUMMARY

[0005] To solve the above problems, the present application provides a system and method for efficiently producing titanium concentrate from iron tailings of vanadium-titanium magnetite, which can simplify the overall titanium concentrate production process, reduce the number of production equipment, and reduce the production cost of titanium concentrate.

[0006] The present application provides a system for efficiently producing titanium concentrate from iron tailings of vanadium-titanium magnetite, which comprises:

[0007] hydrocyclone device, high-frequency vibration screen device, low-intensity magnetic drum separator device, ball mill, titanium concentrate separation device;

[0008] The titanium concentrate separation device comprises:

[0009] The irregular inverted cone communicates with a vertical cavity and an inclined cavity, the vertical cavity is located below the inclined cavity and has an outer peripheral portion connected with an ascending water pipe, 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 has a tailing discharge portion above, the vertical cavity contains a stirring component, the body of the vertical cavity is a cylinder and the lower part is a cone, the outer peripheral portion 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 to input water into the vertical cavity and push the low-density mineral particles in the vertical cavity 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 tailing discharge portion and the high-density titanomagnetite falls down from the concentrate discharge pipe, thereby realizing enrichment of the titanomagnetite.

[0010] The inclined cavity of the titanium concentrate separation device has a rectangular cross section, and the titanium concentrate separation device is used for rough enrichment of ilmenite and sweep enrichment of tailings generated by the rough enrichment of ilmenite.

[0011] Preferably, in the system for efficiently producing titanium concentrate from vanadium-titanium magnetite iron separation tailings, the inclined cavity of the titanium concentrate separation device has a rectangular cross section, the 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 distance between the inclined plates is 3-7 mm, the lower end of the inclined plate is 20-40 cm wide, and the upper end is 18-36 cm wide.

[0012] Preferably, in the system for efficiently producing titanium concentrate from vanadium-titanium magnetite iron separation tailings, the length of the inclined cavity and the inclined plates in the titanium concentrate separation device is 120-180 cm, and the angle between the inclined cavity and the horizontal plane is 50-80°.

[0013] The method for efficiently producing titanium concentrate from vanadium-titanium magnetite iron separation tailings provided by the application utilizes the system for efficiently producing titanium concentrate from vanadium-titanium magnetite iron separation tailings as described in any one of the above embodiments, and comprises the following steps:

[0014] S1: using the high-frequency vibration screen device to separate slag from vanadium-titanium magnetite iron separation tailings;

[0015] S2: using the weak magnetic drum magnetic separator device to remove iron from the undersize product of the slag separator;

[0016] S3: pre-concentration of the tailings from the weak magnetic separation;

[0017] S4: using the hydrocyclone device and the high-frequency vibrating screen device to perform first classification on the magnetic separation concentrate from the strong magnetic pre-concentration;

[0018] S5: using the ball mill to grind the classified coarse product and the oversize product of the slag separator;

[0019] S6: using the high-frequency vibrating screen device to perform second classification on the classified fine product;

[0020] S7: adding metallic iron powder to the intermediate product after the second classification for stirring and slurry preparation, and using the ilmenite separation device and the weak magnetic drum magnetic separator device to pre-concentrate ilmenite and remove iron from the classified intermediate product;

[0021] S8: performing flotation desulfurization on the concentrate from the ilmenite separation device and the weak magnetic separator to obtain fifth ilmenite concentrate and second sulfur concentrate, the fifth ilmenite concentrate being the final ilmenite concentrate;

[0022] S9: performing third classification on the middlings from the ilmenite separation device;

[0023] S10: performing flotation desulfurization and ilmenite selection on the fine product from the second classification and the third classification to obtain third ilmenite concentrate and first sulfur concentrate, the third ilmenite concentrate being the final ilmenite concentrate.

[0024] Preferably, in the above method for efficiently producing ilmenite concentrate from vanadium-titanium magnetite iron tailings, the step of adding metallic iron powder to the intermediate product after the second classification for stirring and slurry preparation, and using the ilmenite separation device and the weak magnetic drum magnetic separator device to pre-concentrate ilmenite and remove iron from the classified intermediate product comprises:

[0025] S71: sending the hydrocyclone sand from step S4 and the oversize product from step S6 into a stirring barrel, adding water and metallic iron powder with a particle size less than 0.074 mm, adjusting the pulp concentration to 25% to 45%, and then feeding into step S72 with a pump;

[0026] S72: using the ilmenite separation device to enrich ilmenite roughing, separating the ore from step S71, adjusting the feeding speed, upward water flow, stirring speed, and discharge speed of the ilmenite separation device, to obtain first ilmenite concentrate and second tailings, the first ilmenite concentrate being fed into step S73, and the second tailings being fed into step S75 with a pump;

[0027] S73: removing iron from the first titanium concentrate by using the weak magnetic drum magnetic separator device to obtain a fourth titanium concentrate and a second metallic iron powder;

[0028] S74: enriching ilmenite by using the titanium concentrate separation device to separate the second tailings generated in step S72, adjusting the feeding speed, rising water quantity, stirring speed, and discharge speed of the titanium concentrate separation device to obtain a second titanium concentrate and a third tailings, the second titanium concentrate being sent to step S75, and the third tailings being used as the final tailings;

[0029] S75: removing iron from the second titanium concentrate by using the weak magnetic drum magnetic separator device to obtain a first metallic iron powder and tailings for being sent to step S9.

[0030] S76: after demagnetizing the first metallic iron powder and the second metallic iron powder by using a demagnetizer, the first metallic iron powder and the second metallic iron powder are sent to the stirring barrel in step S71.

[0031] Preferably, in the method for efficiently producing a titanium concentrate from vanadium-titanium magnetite iron separation tailings, the use of the high-frequency vibrating screen device to separate the vanadium-titanium magnetite iron separation tailings includes:

[0032] The high-frequency vibrating screen with a screen hole diameter of 1 mm to 1.5 mm is used to separate the slag, and the undersize product is sent to step S2, and the oversize product is sent to step S5.

[0033] The weak magnetic drum magnetic separator device with a magnetic field strength of 0.30 T to 0.40 T is used to remove iron from the undersize product of the separated slag, and the strong magnetic minerals are removed, and the tailings are sent to step S3.

[0034] Preferably, in the method for efficiently producing a titanium concentrate from vanadium-titanium magnetite iron separation tailings, the strong magnetic pre-concentration of the tailings after weak magnetic separation includes:

[0035] S31: for the tailings generated in step S2, a vertical ring pulsating high gradient magnetic separator is used for strong magnetic roughing pre-enrichment of ilmenite, the magnetic field strength is 0.8 T to 1.0 T, the magnetic separation tailings are self-flowed to step S32, and the magnetic separation concentrate is sent to step S4.

[0036] S32: for the magnetic separation tailings generated in step S31, a vertical ring pulsating high gradient magnetic separator is used for ilmenite magnetic separation scavenging pre-enrichment, the magnetic field strength is 0.9 T to 1.2 T, the magnetic separation tailings are used as the first tailings, the first tailings are used as the final tailings, and the obtained magnetic separation concentrate is pumped into step S4.

[0037] Preferably, in the method for efficiently producing a titanium concentrate from vanadium-titanium magnetite iron separation tailings, the first classification of the strong magnetic pre-concentration magnetic separation concentrate by using the hydrocyclone device and the high-frequency vibrating screen device includes:

[0038] 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;

[0039] S42: the cyclone overflow produced in step S41 is classified by a high-frequency vibrating screen with a screen size of 0.5 mm, the screen oversize product flows into step S5, and the screen undersize product is pumped into step S43;

[0040] S43: the screen undersize product 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;

[0041] the second classification of the classified fine product by the high-frequency vibrating screen device comprises:

[0042] the cyclone overflow produced in step S43 is classified by a high-frequency vibrating screen with a screen size of 0.15 mm, the screen oversize product flows into step S7, and the screen undersize product flows into step S10.

[0043] Preferably, in the above method for efficiently producing titanium concentrate from vanadium-titanium magnetite iron separation tailings, the grinding of the classified coarse product and the screen oversize product by the ball mill comprises:

[0044] the screen oversize products 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.

[0045] Preferably, in the above method for efficiently producing titanium concentrate from vanadium-titanium magnetite iron separation tailings, the fifth titanium concentrate and the second sulfur concentrate obtained by flotation desulfurization of the concentrate produced by the titanium concentrate separation device, and the fifth titanium concentrate as the final titanium concentrate comprises:

[0046] sulfuric acid, butyl xanthate, and 2# oil are added, and the tailings obtained by weak magnetic iron removal of the concentrate produced by the titanium concentrate separation device are subjected to flotation desulfurization, and the flotation desulfurization comprises one-stage roughing, two-stage scavenging, two-stage cleaning, and sequential return of middlings to a closed circuit process.

[0047] As can be known from the above description, the system for efficiently producing titanium concentrate from vanadium-titanium magnetite iron separation tailings provided by the application comprises a hydrocyclone device, a high-frequency vibrating screen device, a weak magnetic cylinder type magnetic separator device, a ball mill and a titanium concentrate separation device; the titanium concentrate separation device comprises a vertical cavity and an inclined cavity connected by an irregular inverted cone, the vertical cavity is located below the inclined cavity and has an ascending water pipe connected to the 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 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 to input water into the vertical cavity and push the low-density mineral particles in the vertical cavity 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 of the tailing discharge part and the high-density titanium magnetite falls from the concentrate discharge pipe, realizing enrichment of the titanium magnetite; the inclined cavity of the titanium concentrate separation device has a rectangular cross section, the titanium concentrate separation device is used for rough enrichment of ilmenite and enrichment of tailings produced by the rough enrichment of ilmenite, and it can be seen that the titanium concentrate separation device can be used for preliminary scanning and roughing, so as to reduce impurities entering the subsequent process, thereby simplifying the process of titanium concentrate production, reducing the number of production equipment and reducing the production cost of titanium concentrate. The method for efficiently producing titanium concentrate from vanadium-titanium magnetite iron separation tailings provided by the application has the same advantages. BRIEF DESCRIPTION OF DRAWINGS

[0048] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description only constitute the embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor based on the provided drawings.

[0049] Figure 1 The figure is a schematic diagram of the embodiment of the system for efficiently producing titanium concentrate from vanadium-titanium magnetite iron separation tailings provided by the application;

[0050] Figure 2 The figure is a schematic diagram of the titanium concentrate separation device;

[0051] Figure 3 The figure is a different angle view of the titanium concentrate separation device;

[0052] Figure 4The schematic diagram of the embodiment of the method for efficiently producing titanium concentrate by using vanadium-titanium magnetite iron tailings provided by the present application is shown in the figure.

[0053] Figure 5 The process schematic diagram used by the example provided by the present application is shown in the figure. DETAILED DESCRIPTION

[0054] The core of the present application is to provide a system and method for efficiently producing titanium concentrate by using vanadium-titanium magnetite iron tailings, which can simplify the overall titanium concentrate production process, reduce the number of production equipment, and reduce the production cost of titanium concentrate.

[0055] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0056] The present application provides an embodiment of a system for efficiently producing titanium concentrate by using vanadium-titanium magnetite iron tailings Figure 1 and Figure 2 as shown in the figure, Figure 1 The present application provides a schematic diagram of an embodiment of a system for efficiently producing titanium concentrate by using vanadium-titanium magnetite iron tailings, Figure 2 The schematic diagram of the titanium concentrate sorting device is shown in the figure. The system can include:

[0057] A hydrocyclone device A1, a high-frequency vibrating screen device A2, a weak magnetic cylinder type magnetic separator device A3, a ball mill A4, and a titanium concentrate sorting device A5.

[0058] The titanium concentrate sorting device A5 can include:

[0059] The vertical cavity 1 and the inclined cavity 13 are connected by the irregular inverted cone 9. The vertical cavity 1 is located below the inclined cavity 13 and has an outer peripheral portion connected with the rising water pipe 2. The inclined cavity 13 internally accommodates inclined plates 14 all having the same shape and size. The width of the inclined cavity 13 and all the inclined plates 14 gradually decreases from bottom to top. The inclined cavity 13 has a tailings discharge portion C above it. The vertical cavity 1 internally accommodates a stirring component D. The body of the vertical cavity 1 is a cylinder and the lower part is a cone 3. The outer peripheral portion of the body is provided with a feeding pipe 8. The lower part of the cone 3 is provided with a concentrate discharge pipe 4. The rising water pipe 2 is used to input water into the vertical cavity 1 and push the low-density mineral particles therein to move upward along the inclined plates 14 in the vertical cavity 1 and the inclined cavity 13, so as to push the low-density mineral particles out of the tailings discharge portion C and make the high-density ilmenite fall down from the concentrate discharge pipe 4, thereby realizing 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 the titanium concentrate sorting device A5 has a rectangular cross-section, as shown below. Figure 3 In 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 of gap between adjacent inclined plates to allow mineral particles to pass through. The titanium concentrate sorting device 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.

[0061] As described above, the system for efficiently producing titanium concentrate from iron tailings of vanadium-titanium magnetite provided by the present invention includes a hydrocyclone device, a high-frequency vibrating screen device, a weak magnetic drum separator device, a ball mill, and a titanium concentrate separation device. The titanium concentrate separation device includes: a vertical cavity and an inclined cavity connected by an irregular inverted cone. The vertical cavity is located below the inclined cavity and its outer periphery is connected to a rising water pipe. The inclined cavity contains inclined plates of the same shape and size, and the width of the inclined cavity and all the inclined plates gradually decreases from bottom to top. A tailings discharge section is located above the inclined cavity. A stirring component is housed inside the vertical cavity. The main body of the vertical cavity is cylindrical with a conical lower part. A feed pipe is provided on the outer periphery of the main body. The device is equipped with a concentrate discharge pipe and an ascending water pipe for inputting water into the vertical cavity. The input water pushes the low-density mineral particles in the vertical cavity and the inclined plate in the inclined cavity upward, 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, thus enriching titanomagnetite. The inclined cavity in the titanium concentrate sorting device has a rectangular cross-section. The titanium concentrate sorting device is used for the roughing of enriched ilmenite and the scavenging of the tailings generated from the roughing of enriched ilmenite. It can be seen that the titanium concentrate sorting device can perform preliminary scavenging and roughing, thereby reducing impurities entering the subsequent process. Therefore, it can simplify the overall titanium concentrate production process, reduce the number of production equipment, and reduce the titanium concentrate production cost.

[0062] In one specific embodiment of the above system for efficiently producing titanium concentrate from vanadium-titanium magnetite iron separation tailings, the inclined cavity in the titanium concentrate sorting device has a rectangular cross section, and the lower port has a rectangular length of 20-40 cm and a width of 12-18 cm, and the upper port is a square with a side length of 18-36 cm, wherein the spacing of the inclined plates is 3-7 mm, and the lower end of the inclined plate is 20-40 cm wide and the upper end is 18-36 cm wide.

[0063] In another embodiment of the system for efficiently producing titanium concentrate from vanadium-titanium magnetite iron separation tailings, the length of the inclined cavity and the inclined plate in the titanium concentrate sorting device A5 is 120-180 cm, which can be further preferably 150 cm, and the angle between the inclined plate and the horizontal plane is 50-80°, which can be further preferably 70°. When selecting the size, the size of the upper port of the inclined cavity is smaller than the size of the lower port, and the same applies to the inclined plate. In addition, the body of the vertical cavity 1 can be a cylindrical shape with a diameter of 30-50 cm and a height of 50-70 cm, and further, the diameter is preferably 40 cm and the height is preferably 60 cm, which can be selected according to actual needs, and is not limited here; the height of the irregular inverted cone 9 can be 15-25 cm, which is further preferably 20 cm, and the angle between the farthest point of the cone surface from the center and the horizontal direction is 30-60°, which is further preferably 45°, and the angle between the nearest point of the cone surface from the center and the horizontal direction is 75-85°, which is further preferably 80°, which can be detachably connected with the vertical cavity 1 below and the inclined cavity above. The rising water pipe 2 is arranged at the connection position of the body and the cone 3, and the number can be 6-8, which is preferably 8, the diameter is 1-2 cm, which is preferably 1.5 cm, and is uniformly distributed along the outer peripheral portion of the cone, so that the flow in different directions is more uniform, and of course the flow in each water pipe can be controlled separately. The angle between the cone surface of the cone 3 and the horizontal plane can be 50-70°, which is preferably 60°, the diameter of the concentrate discharge pipe 4 can be 1-2 cm, which is preferably 1.5 cm, and the concentrate discharge valve 5 can be further arranged on the concentrate discharge pipe 4, and further comprising a discharge water supplement pipe 6 arranged at the connection position of the concentrate discharge pipe 4 and the cone, which can be preferably 1 cm in diameter, and the water flow can be controlled, and water can be added according to actual needs to prevent the position from being blocked during the discharge process; the tailings discharge part C can include a tailings collection tank 12 and a tailings discharge pipe 11 with a diameter of 2-4 cm, which is preferably 3 cm. Such a tailings collection tank 12 can temporarily store tailings to prevent congestion and blockage of the tailings discharge pipe. The stirring part D can include a stirring impeller 7, a stirring shaft 6 connected thereto, and a transmission part 15, so that the mineral particles in the vertical cavity can be stirred to be uniformly dispersed and easily moved. The ore feeding pipe 8 is arranged at the middle height position of the body and can have a diameter of 1-2 cm, which is preferably 1.5 cm. Referring to Figure 2 Further, a rack 10 for supporting the vertical cavity 1 and the inclined cavity 13 can be further included, so that the overall stability of the device is improved and the device will not tilt or fall down.

[0064] The present application provides an embodiment of the method for efficiently producing titanium concentrate from vanadium-titanium magnetite iron separation tailings as shown in Figure 4 Figure 4 ​The schematic diagram of the embodiment of the method for efficiently producing titanium concentrate from vanadium-titanium magnetite iron separation tailings provided by the application can include the following steps by using the system for efficiently producing titanium concentrate from vanadium-titanium magnetite iron separation tailings according to any one of the above.

[0065] S1: using a high-frequency vibrating screen device to separate slag from vanadium-titanium magnetite iron separation tailings;

[0066] Specifically, this step can include: using a high-frequency vibrating screen with a screen hole diameter of 1 mm to 1.5 mm to separate slag, and the undersize product enters step S2, and the oversize product enters step S5.

[0067] S2: using a weak magnetic drum-type magnetic separator device to remove iron from the undersize product of the separated slag by weak magnetism;

[0068] Specifically, the undersize product of the separated slag can be removed by weak magnetism using a weak magnetic drum-type magnetic separator device with a magnetic field strength of 0.3 T to 0.4 T, and the strong magnetic minerals are removed, and the tailings enter step S3.

[0069] S3: strong magnetic pre-separation of the tailings removed by weak magnetism;

[0070] Specifically, it can include the following sub-steps:

[0071] S31: for the tailings produced in step S2, a vertical ring pulsating high gradient magnetic separator is used for rough magnetic separation and pre-concentration of ilmenite, the magnetic field strength is 0.8 T to 1.0 T, the magnetic separation tailings flow into step S32, and the magnetic separation concentrate enters step S4;

[0072] S32: for the magnetic separation tailings produced in step S31, a vertical ring pulsating high gradient magnetic separator is used for magnetic separation and pre-concentration of ilmenite, the magnetic field strength is 0.9 T to 1.2 T, the magnetic separation tailings are used as the first tailings, the first tailings are used as the final tailings, and the obtained magnetic separation concentrate is fed into step S4 by a pump.

[0073] S4: using a hydrocyclone device and a high-frequency vibrating screen device to perform first classification on the magnetic separation concentrate of the strong magnetic pre-separation;

[0074] Specifically, it can include the following sub-steps:

[0075] S41: using a hydrocyclone to classify the magnetic separation concentrate produced in step S3 into cyclone sand and cyclone overflow, the cyclone sand flows into step S5, and the cyclone overflow flows into step S42;

[0076] S42: using a high-frequency vibrating screen to classify the cyclone overflow produced in step S41, the screen hole size is 0.5 mm, the oversize product enters step S5, and the undersize product is fed into step S43 by a pump.

[0077] S43: the undersize product generated in step S42 is classified by using a hydrocyclone, and is divided into cyclone underflow and cyclone overflow, the cyclone underflow flows into step S7, and the cyclone overflow flows into step S6;

[0078] S5: the classified coarse product and the raffinate oversize product are ground by using a ball mill;

[0079] Specifically, the oversize product generated in step S1 and step S42 and the cyclone underflow generated in step S41 can be ground, and the ground product is pumped into step S2 by using a pump.

[0080] S6: the classified fine product is classified again by using a high-frequency vibrating screen device;

[0081] Specifically, the cyclone overflow generated in step S43 can be classified by using a high-frequency vibrating screen, the size of the screen hole is 0.15 mm, the oversize product flows into step S7, and the undersize product flows into step S10.

[0082] S7: metallic iron powder is added into the intermediate product after the second classification to stir and mix, and a titanium concentrate separation device and a weak magnetic drum magnetic separator device are used to pre-separate ilmenite and remove iron from the classified intermediate product;

[0083] It should be noted that the added metallic iron powder can have three effects: oxidation film, residual reagent and fine mud cover. First, the fresh iron surface can be equivalent to an "on-site reduction station", and the second classification overflow often contains 10% to 30% of oxidized substances, and the floatability is suddenly reduced. The iron powder in the slurry forms Fe 0 / Fe 2+The micro-battery directly reduces the high-valence metal on the mineral surface to low-valence or metal state, which is equivalent to "on-line sulfidation", and the activation rate can be increased by 15-30 percentage points without additional addition of expensive sulfidation agents such as NaHS and NH4HS; secondly, it can eat up the residual reagents, reduce "reagent conflict", and the residual xanthate / black reagent in the tailings of the previous stage of flotation will "steal" the bubbles from the subsequent cleaning froth, causing the cleaning to be "sticky" or "off the groove", and after the iron powder adsorbs these organic dithio compounds, it is recovered with the iron by the magnetic separator, which is equivalent to installing a "reagent scavenger" on site, and the cleaning froth immediately "crumbles" down, and the grade of the cleaning tailings can be reduced by 0.03%-0.08%. 3 The micro-battery directly reduces the high-valence metal on the mineral surface to low-valence or metal state, which is equivalent to "on-line sulfidation", and the activation rate can be increased by 15-30 percentage points without additional addition of expensive sulfidation agents such as NaHS and NH4HS; secondly, it can eat up the residual reagents, reduce "reagent conflict", and the residual xanthate / black reagent in the tailings of the previous stage of flotation will "steal" the bubbles from the subsequent cleaning froth, causing the cleaning to be "sticky" or "off the groove", and after the iron powder adsorbs these organic dithio compounds, it is recovered with the iron by the magnetic separator, which is equivalent to installing a "reagent scavenger" on site, and the cleaning froth immediately "crumbles" down, and the grade of the cleaning tailings can be reduced by 0.03%-0.08%. 3 The micro-battery directly reduces the high-valence metal on the mineral surface to low-valence or metal state, which is equivalent to "on-line sulfidation", and the activation rate can be increased by 15-30 percentage points without additional addition of expensive sulfidation agents such as NaHS and NH4HS; secondly, it can eat up the residual reagents, reduce "reagent conflict", and the residual xanthate / black reagent in the tailings of the previous stage of flotation will "steal" the bubbles from the subsequent cleaning froth, causing the cleaning to be "sticky" or "off the groove", and after the iron powder adsorbs these organic dithio compounds, it is recovered with the iron by the magnetic separator, which is equivalent to installing a "reagent scavenger" on site, and the cleaning froth immediately "crumbles" down, and the grade of the cleaning tailings can be reduced by 0.03%-0.08%.

[0084] Specifically, the step can include the following sub-steps:

[0085] S71: Send the cyclone sand produced in step S4 and the sieve product produced in step S6 into a stirring barrel and add water and metal iron powder with a particle size of less than 0.074 mm, adjust the pulp density to 25%-45%, and then pump into step S72;

[0086] S72: Use a titanium concentrate separation device to carry out rough separation of ilmenite, separate the ore from step S71, adjust the feed rate, upward water flow, stirring speed, and discharge rate of the titanium concentrate separation device, obtain a first titanium concentrate and a second tailings, and pump the first titanium concentrate into step S73 and the second tailings into step S75;

[0087] S73: Use a weak magnetic drum type magnetic separator device to remove iron from the first titanium concentrate, obtain a fourth titanium concentrate and a second metal iron powder;

[0088] S74: Use a titanium concentrate sorting device to enrich ilmenite by scavenging. The second tailings generated in the sorting step S72 are used to adjust the feed rate, rising water volume, stirring speed and discharge rate of the titanium concentrate sorting device to obtain the second titanium concentrate and the third tailings. The second titanium concentrate is sent to step S75 and the third tailings are used as the final tailings.

[0089] S75: Use a weak magnetic drum magnetic separator to remove iron from the second titanium concentrate to obtain the first metallic iron powder and tailings to be fed into step S9.

[0090] S76: After demagnetizing the first and second metallic iron powders using a demagnetizer, they are sent into the mixing tank in step S71.

[0091] S8: The concentrate produced by the titanium concentrate sorting unit and the weak magnetic separator is subjected to flotation desulfurization to obtain the fifth titanium concentrate and the second sulfur concentrate. The fifth titanium concentrate is used as the final titanium concentrate.

[0092] Specifically, it may include the following sub-steps:

[0093] Sulfuric acid, butyl xanthate, and No. 2 oil are added. The flotation desulfurization is carried out on the tailings of the titanium concentrate produced by the titanium concentrate separation unit after weak magnetic iron removal. The flotation desulfurization includes one roughing stage, two scavenging stages, two cleaning stages, and middlings are returned to the closed-loop process in sequence.

[0094] S9: Perform a third classification on the middlings produced by the titanium concentrate sorting unit;

[0095] Specifically, hydrocyclone classification can be performed first: the iron removal tailings are divided into hydrocyclone underflow and hydrocyclone overflow. The hydrocyclone underflow flows by gravity into step S5, and the hydrocyclone overflow enters the next sub-step. Then, high-frequency vibrating screen classification is performed: the hydrocyclone overflow from the previous sub-step is classified using a high-frequency vibrating screen with a screen aperture size of 0.15mm. The oversize product enters the grinding operation in step S5, and the undersize product is fed into step S10.

[0096] S10: The fine-grained products from the second and third classifications are subjected to flotation desulfurization and titanium beneficiation to obtain the third titanium concentrate and the first sulfur concentrate. The third titanium concentrate is used as the final titanium concentrate.

[0097] Specifically, it may include the following sub-steps:

[0098] S101: Flotation Desulfurization: Add sulfuric acid, butyl xanthate, No. 2 oil and other reagents to the flotation machine to desulfurize the undersize product from step 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 the operation in step S102.

[0099] S102: Titanium flotation: Add sulfuric acid, diesel oil, MOH, and high-quality titanium reagents and use a flotation machine to perform titanium flotation on the desulfurization tailings from step S101. 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 a third titanium concentrate and a fourth tailings. The third titanium concentrate is used as the final concentrate, and the fourth tailings are used as the final tailings.

[0100] In summary, the embodiments of this application use metallic iron powder as a weighting agent to separate ilmenite. The process involves iron tailings separation, slag removal, weak magnetic iron removal, strong magnetic pre-enrichment of ilmenite, hydrocyclone + high-frequency screen classification, coarse grinding and return to slag separation, fine-grained hydrocyclone + high-frequency screen classification, coarse particles enriched in a titanium concentrate separation device, and tailings finely separated in a titanium concentrate separation device, while fine particles are recovered through grinding and flotation. This process yields gravity-separated titanium concentrate and flotation titanium concentrate, significantly reducing the amount of material entering the grinding and flotation operations. It lays the foundation for low-cost utilization of ilmenite from vanadium-titanium magnetite and has significant economic benefits.

[0101] The above method will be explained in detail with a specific example below:

[0102] The main physicochemical properties of the ore used in this example are as follows:

[0103] 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%.

[0104] refer to Figure 5 , Figure 5 The process diagram used in the example provided by the present invention is as follows:

[0105] (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).

[0106] (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).

[0107] (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).

[0108] (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.

[0109] (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.

[0110] (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 0.5mm. The product on the screen flows into the operation (7) by gravity, and the product under the screen is pumped to the operation (8).

[0111] (7) Grinding: The products on the screens of (1) and (6) and the cyclone underflow of (5) flow into the XMB-ф420×600 type continuous ball mill by gravity, and the mill discharge pump sends it to (2) operation;

[0112] (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.

[0113] (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 0.15mm. The product on the screen flows into operation (10) by gravity, and the product under the screen flows into operation (18) by gravity.

[0114] (10) Slurry preparation: Using an XDT-15L mixing tank, water was added to adjust the concentration to 30% for the hydrocyclone sediment in (8) and the product on the high-frequency screen in (9). At the same time, water with a density of 7.86 g / cm³ was added to the mixing tank. 3Metallic iron powder with a particle size of less than 0.074 mm, the amount of metallic iron powder added is 5.5 kg / t (for iron tailings), and the ore discharge pump of the mixing tank is used to feed it in (11).

[0115] (11) Titanium concentrate sorting device enriches ilmenite roughing: the spacing between the inclined plates is 5mm. Adjust the parameters such as the feed rate, rising water volume, stirring speed, and discharge rate of the titanium concentrate sorting device to obtain titanium concentrate 1 and tailings 2. Titanium concentrate 1 is fed into operation (18), and tailings 2 is fed into operation (12) by pump.

[0116] (12) Titanium concentrate sorting device enriches ilmenite scavenging: the spacing between the inclined plates is 5mm. Adjust the parameters such as the feeding speed, rising water volume, stirring speed, and discharge speed of the titanium concentrate sorting device to obtain titanium concentrate 2 and tailings 3. Titanium concentrate 2 is fed into operation (13), and tailings 3 is used as the final tailings.

[0117] (13) Weak magnetic removal: (12) Titanium concentrate 2 enters a permanent magnet drum separator with a magnetic field strength of 0.35T to remove metallic iron powder, and metallic iron powder 1 is obtained. The tailings enter (14) operation, and metallic iron powder 1 enters (20) operation.

[0118] (14) Hydrocyclone classification: The tailings of (13) weak magnetic iron removal are divided into hydrocyclone underflow and hydrocyclone overflow. The hydrocyclone underflow flows into (7) operation by gravity, and the hydrocyclone overflow flows into (15) operation.

[0119] (15) High-frequency vibrating screen grading: (14) The overflow of the hydrocyclone in operation adopts high-frequency vibrating screen grading with a screen hole size of 0.15mm. The product on the screen enters (7) operation, and the product under the screen is fed into (16) operation.

[0120] (16) Flotation desulfurization: Add sulfuric acid, butyl xanthate, No. 2 oil and other reagents to the flotation machine to desulfurize the undersize product of (15) operation. 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 (17) operation.

[0121] (17) Titanium flotation: Add sulfuric acid, diesel oil, MOH (titanium flotation collector), and high-quality titanium and other reagents to the flotation machine to perform titanium flotation on the desulfurization tailings of (18) 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 3 and tailings 4. Titanium concentrate 3 is used as the final concentrate and tailings 4 is used as the final tailings.

[0122] (18) Weak magnetic removal of iron: (11) The titanium concentrate 1 is separated by a permanent magnet drum magnetic separator with a magnetic field strength of 0.35T to remove the metal iron powder, and metal iron powder 2 and titanium concentrate 4 are obtained. Titanium concentrate 4 enters (19) operation, and metal iron powder 2 enters (20) operation.

[0123] (19) Flotation desulfurization: Add sulfuric acid, butyl xanthate, No. 2 oil and other reagents to the flotation machine to desulfurize the (18) weak magnetic tailings. The flotation desulfurization process is a first roughing stage, two scavenging stages, two cleaning stages, and 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.

[0124] (20) Demagnetization: After metal iron powder 1 and metal iron powder 2 are combined, they are demagnetized by a demagnetizer. The demagnetized product is returned to (10) operation for recycling.

[0125] Table 1 shows the results obtained in this example. Using the above system and method, the iron tailings beneficiation yielded a total titanium concentrate with a yield of 12.27%, containing 47.23% TiO2 and a TiO2 recovery rate of 62.86%. This yield is obtained by adding titanium concentrate 5 and titanium concentrate 3 in the table. The titanium dioxide content is obtained by weight-weighted summation of titanium concentrate 5 and titanium concentrate 3 in the table. The titanium dioxide recovery rate is obtained by adding the titanium dioxide recovery rates of titanium concentrate 5 and titanium concentrate 3 in the table. It can be seen that compared with the conventional process, the TiO2 recovery rate of titanium concentrate is increased by 5 to 7 percentage points.

[0126] Table 1. Results obtained from this example.

[0127]

[0128] 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 efficiently producing titanium concentrate from iron tailings of vanadium-titanium magnetite ore, characterized in that, include: Hydrocyclone device, high frequency vibrating screen device, weak magnetic drum magnetic separator device, ball mill, titanium concentrate separation device; The titanium concentrate sorting device includes: 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. The inclined cavity in the titanium concentrate sorting device has a rectangular cross-section. The titanium concentrate sorting device is used for enriching ilmenite roughing and for enriching ilmenite scavenging of the tailings generated from the enriching ilmenite roughing.

2. The system for efficiently producing titanium concentrate from vanadium-titanium magnetite tailings according to claim 1, characterized in that, The inclined cavity in the 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 3mm to 7mm, and the lower end of the inclined plate is 20cm to 40cm wide, while the upper end is 18cm to 36cm wide.

3. The system for efficiently producing titanium concentrate from iron tailings of vanadium-titanium magnetite according to claim 2, characterized in that, The inclined cavity and inclined plate in the titanium concentrate sorting device have a length of 120cm to 180cm and an inclination angle of 50° to 80° with respect to the horizontal plane.

4. A method for efficiently producing titanium concentrate from iron tailings of vanadium-titanium magnetite ore, characterized in that, The system for efficiently producing titanium concentrate from vanadium-titanium magnetite tailings as described in any one of claims 1-3 comprises: S1: Use the high-frequency vibrating screen device to filter tailings from vanadium-titanium magnetite iron ore. S2: Use the weak magnetic drum magnetic separator to perform weak magnetic iron removal on the screened product of the slag separator; S3: Strong magnetic pre-selection of tailings for weak magnetic iron removal; 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. S5: Grind the graded coarse-grained product and the product on the slag screen using the ball mill; S6: The high-frequency vibrating screen device is used to perform a second grading of the fine particle product; S7: Add metallic iron powder to the intermediate product after the second classification and stir to adjust the slurry. Then, use the titanium concentrate separation device and the weak magnetic drum magnetic separator to pre-select ilmenite and remove iron from the intermediate product after classification. S8: The concentrate produced by the titanium concentrate sorting device and the weak magnetic separator is subjected to flotation desulfurization to obtain a fifth titanium concentrate and a second sulfur concentrate, wherein the fifth titanium concentrate is used as the final titanium concentrate; S9: Perform a third classification on the middlings produced by the titanium concentrate sorting device; S10: The fine-grained products produced by the second and third classifications are subjected to flotation desulfurization and titanium beneficiation to obtain a third titanium concentrate and a first sulfur concentrate, wherein the third titanium concentrate is used as the final titanium concentrate.

5. The method for efficiently producing titanium concentrate from iron tailings of vanadium-titanium magnetite according to claim 4, characterized in that, The step of adding metallic iron powder to the intermediate product after the second classification for stirring and slurry preparation, and using the titanium concentrate separation device and the weak magnetic drum separator to perform ilmenite pre-selection and iron removal on the classified intermediate product includes: S71: The hydrocyclone sediment produced in step S4 and the screen product produced in step S6 are fed into a mixing tank and water is added. Metal iron powder with a particle size of less than 0.074mm is also added. After adjusting the slurry concentration to 25% to 45%, it is pumped into step S72. S72: The titanium concentrate sorting device is used to enrich ilmenite roughing. In the ore discharge of the sorting step S71, the feed rate, rising water volume, stirring speed and discharge rate of the 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. S73: The first titanium concentrate is subjected to weak magnetic removal of iron by the weak magnetic drum magnetic separator to obtain the fourth titanium concentrate and the second metallic iron powder. S74: The 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, rising water volume, stirring speed and discharge rate of the titanium concentrate sorting device to obtain the second titanium concentrate and the third tailings. The second titanium concentrate is sent to step S75 and the third tailings are used as the final tailings. S75: The second titanium concentrate is subjected to weak magnetic removal of iron using the weak magnetic drum magnetic separator to obtain first metallic iron powder and tailings for feeding into step S9. S76: After demagnetizing the first and second metal iron powders using a demagnetizer, they are fed into the mixing tank in step S71.

6. The method for efficiently producing titanium concentrate from iron tailings of vanadium-titanium magnetite according to claim 5, characterized in that, The process of using the high-frequency vibrating screen device to filter tailings from vanadium-titanium magnetite iron ore beneficiation includes: A high-frequency vibrating screen with a screen hole 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. A weak magnetic drum-type magnetic separator with a magnetic field strength of 0.30T to 0.40T is used to weakly magnetically remove iron from the undersize product of the slag separator and remove strongly magnetic minerals. The tailings then enter step S3.

7. The method for efficiently producing titanium concentrate from iron tailings of vanadium-titanium magnetite according to claim 6, characterized in that, The process of performing strong magnetic pre-selection on tailings subjected to weak magnetic iron removal includes: 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. 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.

8. The method for efficiently producing titanium concentrate from iron tailings of vanadium-titanium magnetite according to claim 7, characterized in that, The first classification of the magnetic concentrate pre-selected by strong magnetic separation using the hydrocyclone device and the high-frequency vibrating screen device includes: 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. S42: The overflow from the hydrocyclone generated in step S41 is classified using a high-frequency vibrating screen with a screen aperture size of 0.5mm. The product on the screen enters step S5, and the product under the screen is pumped into step S43. 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. The second grading of the fine-particle product using the high-frequency vibrating screen device includes: The hydrocyclone overflow generated in step S43 is classified using a high-frequency vibrating screen with a screen aperture size of 0.15 mm. The product on the screen enters step S7, and the product under the screen flows by gravity into step S10.

9. The method for efficiently producing titanium concentrate from iron tailings of vanadium-titanium magnetite according to claim 8, characterized in that, The grinding of the graded coarse product and the product over the slag screen using the ball mill includes: 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.

10. The method for efficiently producing titanium concentrate from iron tailings of vanadium-titanium magnetite according to claim 9, characterized in that, The titanium concentrate produced by the titanium concentrate sorting device is subjected to flotation desulfurization to obtain a fifth titanium concentrate and a second sulfur concentrate. The fifth titanium concentrate, as the final titanium concentrate, comprises: Sulfuric acid, butyl xanthate, and No. 2 oil are added, and a flotation machine is used to desulfurize the tailings of the concentrate produced by the titanium concentrate separation unit after weak magnetic iron removal. The flotation desulfurization includes a first stage of roughing, two stages of scavenging, two stages of cleaning, and middlings returned to the closed-loop process in sequence.

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