Method for recovering multi-grade titanium concentrate and high-quality vanadium-titanium iron concentrate

Abstract

The present invention discloses a method for recovering multi-grade titanium concentrate and high-quality vanadium-titanium iron concentrate, comprising: performing first grinding on vanadium-titanium magnetite raw materials and then performing weak magnetic separation to obtain coarse-grained weak magnetic separation concentrate and coarse-grained weak magnetic separation tailings, and obtaining coarse-grained titanium concentrate with a particle size greater than 0.1 mm based on the coarse-grained weak magnetic separation tailings, wherein the grinding fineness of the first grinding is that -0.074 mm accounts for 30%-40%; performing second grinding on the coarse-grained weak magnetic separation concentrate and then performing weak magnetic separation to obtain fine-grained weak magnetic separation concentrate and fine-grained weak magnetic separation tailings, and obtaining fine-grained titanium concentrate with a particle size of 0.074-0.038 mm based on the fine-grained weak magnetic separation tailings, wherein the grinding fineness of the second grinding is that -0.074 mm accounts for 50%-60%; performing third grinding on the fine-grained weak magnetic separation concentrate and then performing magnetic separation to obtain magnetic separation concentrate as vanadium-titanium iron concentrate and obtaining magnetic separation tailings, and obtaining ultra-fine-grained titanium concentrate with a particle size less than 0.038 mm based on the magnetic separation tailings, wherein the grinding fineness of the third grinding is that -0.074 mm accounts for 90%-100%. The present invention can achieve efficient recovery of vanadium-titanium magnetite.

Description

Technical Field

[0001] The invention relates to the technical field of ore dressing, and in particular to a method for recovering multi-grade titanium concentrate and high-quality vanadium-titanium-iron concentrate. Background Art

[0002] At present, in the scheme for the development and utilization of titanomagnetite and ilmenite in vanadium-titanium magnetite, the process of selecting iron first and then selecting titanium is often adopted, that is, the titanomagnetite in vanadium-titanium magnetite is first recovered, and then the ilmenite is recovered from the tailings after iron selection. Due to the multi-stage fine grinding of iron selection at the front end, not only the high-quality coarse-grained ilmenite is lost, but also the over-grinding of ilmenite is aggravated. The subsequent recovery cost of over-grinded ilmenite is very high and the technical difficulty is extremely great. Therefore, the current vanadium-titanium magnetite recovery process of selecting iron first and then titanium is very unfavorable for the efficient recovery of ilmenite.

[0003] With the increasing demand for titanium products in the military and civilian industries, the economic value of ilmenite has risen sharply, far exceeding that of titanium magnetite. The market demand for titanium concentrate products has increased, and at the same time, many requirements have been put forward for the quality of titanium products, especially the particle size of titanium products. The current vanadium-titanium magnetite recovery process can only produce a single mixed particle size titanium concentrate product, and the product lacks competitiveness. In order to reverse the situation where the vanadium-titanium magnetite titanium selection product is single, the product quality is low, and the economic value is not fully reflected, it is necessary to study an efficient vanadium-titanium magnetite recovery process. Summary of the invention

[0004] The main purpose of the present invention is to provide a method for recovering multi-grade titanium concentrate and high-quality vanadium-titanium-iron concentrate to solve at least one aspect of the above-mentioned technical problems.

[0005] According to one aspect of the present invention, a method for recovering multi-grade titanium concentrate and high-quality vanadium-titanium iron concentrate is proposed, which is characterized by comprising: performing a first grinding on the vanadium-titanium magnetite raw material and then performing weak magnetic separation to obtain a coarse-grained weak magnetic separation concentrate and a coarse-grained weak magnetic separation tailings, and obtaining a coarse-grained titanium concentrate with a particle size greater than 0.1 mm based on the coarse-grained weak magnetic separation tailings, wherein the grinding fineness of the first grinding is -0.074 mm, accounting for 30%-40%; performing a second grinding on the coarse-grained weak magnetic separation concentrate and then performing weak magnetic separation to obtain a fine-grained weak magnetic separation concentrate and a fine-grained weak magnetic separation tailings. Magnetic separation tailings, and based on the fine-grained weak magnetic separation tailings, a fine-grained titanium concentrate with a particle size of 0.074-0.038 mm is obtained, wherein the grinding fineness of the second grinding is -0.074 mm, accounting for 50%-60%; the fine-grained weak magnetic separation concentrate is subjected to third grinding and then magnetic separation to obtain a magnetic separation concentrate as a vanadium-titanium-iron concentrate and a magnetic separation tailings, and based on the magnetic separation tailings, an ultrafine-grained titanium concentrate with a particle size less than 0.038 mm is obtained, wherein the grinding fineness of the third grinding is -0.074 mm, accounting for 90%-100%.

[0006] According to an embodiment of the present invention, obtaining the coarse-grained titanium concentrate with a particle size greater than 0.1 mm based on the coarse-grained weak magnetic separation tailings includes: performing a first classification on the coarse-grained weak magnetic separation tailings using a hydrocyclone to obtain first underflow and first overflow; performing spiral gravity separation on the first underflow to obtain spiral concentrate as the coarse-grained titanium concentrate and obtaining spiral middlings.

[0007] According to an embodiment of the present invention, after performing the second grinding on the coarse-grained weak magnetic separation concentrate and the spiral middlings, performing weak magnetic separation to obtain the fine-grained weak magnetic separation concentrate and the fine-grained weak magnetic separation tailings.

[0008] According to an embodiment of the present invention, obtaining the fine-grained titanium concentrate with a particle size of 0.074 - 0.038 mm based on the fine-grained weak magnetic separation tailings includes: performing a second classification on the fine-grained weak magnetic separation tailings and the first overflow using a hydrocyclone to obtain second underflow and second overflow; performing first high-intensity magnetic separation on the second underflow to obtain first high-intensity magnetic separation concentrate; performing first flotation on the first high-intensity magnetic separation concentrate to obtain first flotation concentrate as the fine-grained titanium concentrate.

[0009] According to an embodiment of the present invention, obtaining the ultra-fine-grained titanium concentrate with a particle size less than 0.038 mm based on the magnetic separation tailings includes: performing second high-intensity magnetic separation on the magnetic separation tailings and the second overflow to obtain second high-intensity magnetic separation concentrate; performing a third classification on the second high-intensity magnetic separation concentrate using a hydrocyclone to obtain third underflow; performing second flotation on the third underflow to obtain second flotation concentrate as the ultra-fine-grained titanium concentrate.

[0010] According to an embodiment of the present invention, the classification particle size of the first classification is 0.074 mm; and / or the classification particle size of the second classification is 0.038 mm; and / or the classification particle size of the third classification is 0.010 mm.

[0011] According to an embodiment of the present invention, the classification pressure of the hydrocyclone for performing the first classification is 0.05 - 0.1 Mpa, the diameter of the overflow pipe is 150 - 200 mm, and the diameter of the underflow port is 40 - 60 mm; and / or the classification pressure of the hydrocyclone for performing the second classification is 0.1 - 0.2 Mpa, the diameter of the overflow pipe is 25 - 35 mm, and the diameter of the underflow port is 8 - 15 mm; and / or the classification pressure of the hydrocyclone for performing the third classification is 0.2 - 0.3 Mpa, the diameter of the overflow pipe is 20 - 25 mm, and the diameter of the underflow port is 8 - 12 mm.

[0012] According to an embodiment of the present invention, the ball milling media used in the first grinding are short cylindrical and contain nano-ceramic materials; and / or the ball milling media used in the second grinding are spherical and contain nano-ceramic materials; and / or the ball milling media used in the second grinding are spherical and contain nano-ceramic materials.

[0013] According to an embodiment of the present invention, after the first grinding of the vanadium-titanium magnetite raw material, weak magnetic separation is carried out, including: carrying out two-stage weak magnetic separation on the material after the first grinding, the magnetic field intensity of the first-stage weak magnetic separation is 3000 - 4000 Oe, and the magnetic field intensity of the second-stage weak magnetic separation is 2500 - 3000 Oe; and / or after the second grinding of the coarse-grained weak magnetic separation concentrate, weak magnetic separation is carried out, including: carrying out two-stage weak magnetic separation on the material after the second grinding, the magnetic field intensity of the first-stage weak magnetic separation is 3000 - 4000 Oe, and the magnetic field intensity of the second-stage weak magnetic separation is 2500 - 3000 Oe.

[0014] According to an embodiment of the present invention, after the second grinding of the coarse-grained weak magnetic separation concentrate, weak magnetic separation is carried out, including: screening the material after the second grinding, and carrying out the weak magnetic separation on the undersize, wherein the screen hole size is 0.125 mm.

[0015] The method for recovering multi-grade titanium concentrate and high-quality vanadium-titanium iron concentrate according to the embodiments of the present invention can realize the multi-grade recovery of titanium concentrate products, and can recover high-quality vanadium-titanium iron concentrate products, realizing the maximum benefit of vanadium-titanium magnetite recovery. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention, and for those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0017] Figure 1 The flowchart showing the method for recovering multi-grade titanium concentrate and high-quality vanadium-titanium iron concentrate according to the embodiments of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] In order to make the purpose, technical solutions and advantages of the present invention clearer, the following will further describe the embodiments of the present invention in detail with reference to specific embodiments and the accompanying drawings.

[0019] It should be noted that in the embodiments of the present invention, all expressions using "first" and "second" are for distinguishing two entities or parameters with the same name but different, so "first" and "second" are only for the convenience of expression and should not be construed as a limitation on the embodiments of the present invention. This will not be elaborated one by one in the subsequent embodiments.

[0020] Figure 1 The flowchart showing the method for recovering multi-grade titanium concentrate and high-quality vanadium-titanium iron concentrate according to the embodiments of the present invention is as Figure 1 shown, and the recovery method includes:

[0021] Perform first grinding on the vanadium-titanium magnetite raw material and then perform weak magnetic separation to obtain coarse-grained weak magnetic separation concentrate and coarse-grained weak magnetic separation tailings, and obtain coarse-grained titanium concentrate with a particle size greater than 0.1 mm based on the coarse-grained weak magnetic separation tailings, wherein the grinding fineness of the first grinding is -0.074 mm accounting for 30%-40%;

[0022] Perform second grinding on the coarse-grained weak magnetic separation concentrate and then perform weak magnetic separation to obtain fine-grained weak magnetic separation concentrate and fine-grained weak magnetic separation tailings, and obtain fine-grained titanium concentrate with a particle size of 0.074-0.038 mm based on the fine-grained weak magnetic separation tailings, wherein the grinding fineness of the second grinding is -0.074 mm accounting for 50%-60%;

[0023] Perform third grinding on the fine-grained weak magnetic separation concentrate and then perform magnetic separation to obtain magnetic separation concentrate as vanadium-titanium iron concentrate and obtain magnetic separation tailings, and obtain ultra-fine-grained titanium concentrate with a particle size less than 0.038 mm based on the magnetic separation tailings, wherein the grinding fineness of the third grinding is -0.074 mm accounting for 90%-100%.

[0024] "Grinding fineness" refers to the fineness of the grinding product, which is expressed by the mass fraction (%) of the ore particles smaller than a certain mesh number (or smaller than a certain size) in the total grinding product. In the embodiments of the present invention, the grinding fineness of the first grinding is -0.074 mm accounting for 30%-40%, that is, it means that the mass fraction of the ore particles with a particle size smaller than 0.074 mm in the grinding product obtained after the first grinding accounts for 30%-40% of the total grinding product. Similar understandings can be made for the grinding fineness of the second grinding and the grinding fineness of the third grinding. The vanadium-titanium magnetite raw material can be the material obtained after the vanadium-titanium magnetite is crushed.

[0025] In an embodiment of the present invention, by setting the grinding fineness of the first grinding to 30%-40% of -0.074mm, it is possible to ensure that coarse-grained ilmenite is preferentially dissociated, and then the coarse-grained ilmenite is separated by weak magnetic separation. After that, by setting the grinding fineness of the second grinding to 50%-60% of -0.074mm, it is possible to ensure the dissociation of fine-grained ilmenite, and then the fine-grained ilmenite is separated by weak magnetic separation. Further, by setting the grinding fineness of the third grinding to 90%-100% of -0.074mm, it is possible to ensure the dissociation of ultra-fine-grained ilmenite and obtain high-quality vanadium-titanium iron concentrate.

[0026] The present invention improves the existing vanadium-titanium magnetite recovery process of first separating iron and then separating titanium, follows the production idea of organizing the whole process with the recovery of high-value minerals as the main line, and makes a full-process layout with ilmenite as the main line from the very beginning of separation. It can not only obtain multi-grade titanium concentrate, but also obtain high-quality vanadium-titanium iron concentrate, which is beneficial to the efficient recovery of vanadium-titanium magnetite.

[0027] In an embodiment of the present invention, a ball mill can be used for grinding. For example, tower mills can be used for ultra-fine grinding in the third grinding. The ball milling medium used in the first grinding is in a short cylindrical shape and contains nano-ceramic materials; and / or the ball milling medium used in the second grinding is spherical and contains nano-ceramic materials; and / or the ball milling medium used in the second grinding is spherical and contains nano-ceramic materials.

[0028] The present invention improves the combination mode of grinding media. In the prior art, the grinding media for each stage of the conventional process of vanadium-titanium magnetite are all cast steel spheres, which easily causes over-grinding of ilmenite and gangue minerals, bringing harm to the subsequent separation operations. In view of the characteristics of ilmenite, the first grinding (coarse grinding) uses short cylindrical nano-ceramic media, and the second grinding (fine grinding) and the third grinding (ultra-fine grinding) use spherical nano-ceramic media. Through such a combination, not only can the over-grinding of ilmenite and gangue minerals be reduced, but also the nano-ceramic material can save energy and reduce consumption compared with the cast steel material, and the workshop noise can be reduced. In the embodiment of the present invention, the short cylinder refers to a cylinder whose axial dimension to radial dimension ratio is in the range of 1-1.5. In some embodiments, the short cylindrical nano-ceramic media used in the first grinding is a mixture of three different specifications of short cylindrical grinding media. Among them, the axial dimension to radial dimension ratio of the first specification of short cylindrical grinding media is 1.15, the axial dimension to radial dimension ratio of the second specification of short cylindrical grinding media is 1.2, and the axial dimension to radial dimension ratio of the third specification of short cylindrical grinding media is 1.3. And in the total short cylindrical grinding media, the mass fraction of the third specification of short cylindrical grinding media is 40%, and the mass fractions of the first specification and the second specification of short cylindrical grinding media are both 30%. The functions of using short cylindrical grinding media are twofold. One is to reduce the generation of slime affecting subsequent flotation; the other is to retain coarse-grained ilmenite concentrate so as not to grind it fine.

[0029] In some embodiments, after the second grinding of the coarse-grained weak magnetic separation concentrate, weak magnetic separation is carried out, including: screening the material after the second grinding, and carrying out the weak magnetic separation on the undersize, wherein the screen hole size is 0.125 mm. A ball mill screening integrated device can be used for the second grinding and the screening, and a high-frequency screen can be used for the screen. The function of screening is to separate in advance the products that have met the requirements of the second grinding in the second grinding product, which can not only reduce the energy consumption of the mill, but also reduce the over-grinding phenomenon of ilmenite.

[0030] In some embodiments, after the first grinding of the vanadium-titanium magnetite raw material, weak magnetic separation is carried out, including: carrying out two-stage weak magnetic separation on the material after the first grinding. The magnetic field intensity of the first-stage weak magnetic separation is 3000 - 4000 Oe, and the magnetic field intensity of the second-stage weak magnetic separation is 2500 - 3000 Oe. The two-stage weak magnetic separation can be realized by a two-stage permanent magnet drum magnetic separator. Similarly, after the second grinding of the coarse-grained weak magnetic separation concentrate, weak magnetic separation is carried out, including: carrying out two-stage weak magnetic separation on the material after the second grinding. The magnetic field intensity of the first-stage weak magnetic separation is 3000 - 4000 Oe, and the magnetic field intensity of the second-stage weak magnetic separation is 2500 - 3000 Oe. The two-stage weak magnetic separation can be realized by a two-stage permanent magnet drum magnetic separator. In addition, after the third grinding of the fine-grained weak magnetic separation concentrate, magnetic separation is carried out, including: using a multi-pole magnetic separator to carry out magnetic separation on the material after the third grinding. Since the content of -0.074 mm in the third grinding product is as high as 100%, it is impossible to efficiently recover the vanadium-titanium iron concentrate in such a fine product with a conventional magnetic separator. Therefore, a multi-pole magnetic separator is used to carry out magnetic separation on the third grinding product, so that not only high-grade vanadium-titanium iron concentrate can be obtained, but also the operation recovery rate is higher than that of a conventional magnetic separator.

[0031] In some embodiments, obtaining a coarse-grained titanium concentrate with a particle size greater than 0.1 mm based on the tailings of the coarse-grained weak magnetic separation includes: using a hydrocyclone to carry out the first classification on the tailings of the coarse-grained weak magnetic separation to obtain a first underflow and a first overflow; carrying out spiral gravity separation on the first underflow to obtain spiral concentrate as the coarse-grained titanium concentrate and obtaining spiral middlings, and also obtaining spiral tailings. The role of spiral gravity separation is to recover the coarse-grained titanium concentrate. Spiral gravity separation equipment is currently relatively mature in the recovery of ilmenite and has a large processing capacity. Alternatively, a variety of other gravity separation equipment can also be used.

[0032] The purpose of the first classification is to strictly control the particle size of the spiral feed product and reduce the fine-grained materials that are not conducive to spiral separation. By using a hydrocyclone to strictly control the separation particle size of the titanium concentrate to achieve narrow particle size titanium separation, not only can the corresponding grade of titanium concentrate be obtained favorably, but also the operation efficiency can be improved. In the embodiments of the present invention, the classification particle size of the first classification can be 0.074 mm. To achieve the good effect of the first classification, the classification pressure of the hydrocyclone for carrying out the first classification is 0.05 - 0.1 Mpa, the diameter of the overflow pipe is 150 - 200 mm, and the diameter of the underflow port is 40 - 60 mm.

[0033] In some embodiments, after the second grinding of the coarse-grained weak magnetic separation concentrate and the spiral middlings, weak magnetic separation is carried out to obtain the fine-grained weak magnetic separation concentrate and the fine-grained weak magnetic separation tailings. In this way, the spiral middlings can also be recycled, further improving the recovery rate.

[0034] In some embodiments, obtaining fine-grained titanium concentrate with a particle size of 0.074 - 0.038 mm from the fine-grained weakly magnetic tailings includes: performing a second classification on the fine-grained weakly magnetic tailings and the first overflow using a hydrocyclone to obtain a second underflow and a second overflow; performing a first high-intensity magnetic separation on the second underflow to obtain a first high-intensity magnetic separation concentrate and, in addition, a first high-intensity magnetic separation tailings; performing a first flotation on the first high-intensity magnetic separation concentrate to obtain a first flotation concentrate as the fine-grained titanium concentrate and, in addition, a first flotation tailings.

[0035] The purpose of the second classification is to discard the -0.038 mm ultrafine-grained material that deteriorates the high-intensity magnetic separation and flotation operations. In the embodiments of the present invention, the classification particle size of the second classification is 0.038 mm. To achieve good results of the second classification, the classification pressure of the hydrocyclone for the second classification is 0.1 - 0.2 Mpa, the diameter of the overflow pipe is 25 - 35 mm, and the diameter of the underflow port is 8 - 15 mm. The first high-intensity magnetic separation can be a conventionally performed high-intensity magnetic separation. The first flotation can be performed using a flotation machine. The role of the first flotation is to recover the fine-grained titanium concentrate. For the flotation of fine-grained ilmenite, a flotation machine or a flotation column can be used. However, considering cost factors, a flotation machine is preferably used for the flotation of fine-grained materials, and a flotation column is used for the flotation of ultrafine-grained ilmenite with a particle size below 0.038 mm.

[0036] In some embodiments, obtaining ultrafine-grained titanium concentrate with a particle size less than 0.038 mm from the magnetic separation tailings includes: performing a second high-intensity magnetic separation on the magnetic separation tailings and the second overflow to obtain a second high-intensity magnetic separation concentrate; performing a third classification on the second high-intensity magnetic separation concentrate using a hydrocyclone to obtain a third underflow; performing a second flotation on the third underflow to obtain a second flotation concentrate as the ultrafine-grained titanium concentrate and, in addition, a second flotation tailings.

[0037] In this embodiment, the ultrafine titanium concentrate is obtained based on the magnetic separation tailings and the second overflow, that is, the second overflow is also recycled, which is beneficial to further improving the recovery rate. The second high-intensity magnetic separation can be carried out by using a ZH high-intensity magnetic separator to obtain iron removal concentrate, the second high-intensity magnetic separation concentrate and the second high-intensity magnetic separation tailings, wherein the iron removal concentrate can be returned to the tower mill to participate in the third grinding again. ZH is the model of a new type of flat ring high-intensity magnetic separator developed by Changsha Institute of Mining and Metallurgy. This model has good recovery effect on ultrafine titanium iron ore. Using it for the rough enrichment of ultrafine titanium iron ore in the present invention can provide a flotation raw material with a relatively high TiO2 grade for the second flotation. The purpose of the third classification is to remove the -0.010mm slime that is not conducive to the efficient recovery of the subsequent second flotation. After the third classification, the third overflow is also obtained, and the third overflow is slime. In the embodiment of the present invention, the classification particle size of the third classification can be 0.010mm. To achieve good results of the third classification, the classification pressure of the hydrocyclone for the third classification is 0.2 - 0.3 Mpa, the diameter of the overflow pipe is 20 - 25mm, and the diameter of the sand settling port is 8 - 12mm. The second flotation can be carried out by using a flotation column. The role of the second flotation is to recover the ultrafine titanium concentrate. The recovery effect of the flotation machine on ultrafine titanium iron ore is worse than that of the flotation column, and the flotation of the flotation column for ultrafine minerals is more stable.

[0038] According to the above description, the present invention provides a process for recovering multi-grade titanium concentrate and high-quality vanadium-titanium iron concentrate, which can solve a series of problems such as high recovery cost, low recovery rate, single product, low product quality, and no price advantage of valuable elements in vanadium-titanium magnetite. Organize the whole process production with the recovery of high-value minerals as the main line to achieve the environmental protection and efficient recovery of vanadium-titanium magnetite.

[0039] The present invention has been improved in terms of process route, product, grinding medium combination method, and narrow particle size titanium separation. Through the solution of the present invention, three grades of titanium concentrate products, namely, coarse-grained titanium concentrate above 0.1mm, fine-grained titanium concentrate of 0.1 - 0.038mm, and ultrafine titanium concentrate below 0.038mm, can be obtained, filling the blank of the particle size selection of titanium concentrate products for titanium processing enterprises; moreover, the TFe grade of the vanadium-titanium iron concentrate recovered at the end of the whole process (for example, 55% - 59%) is 1 - 2 percentage points higher than that of the conventional vanadium-titanium iron concentrate recovery process, and the overall recovery rate of the titanium separation operation can be increased by 5 - 10 percentage points compared with the conventional titanium separation process; the present invention uses a hydrocyclone to strictly control the separation particle size of each grade of titanium concentrate to achieve narrow particle size titanium separation, which can not only be beneficial to obtaining multi-grade titanium concentrate, but also improve the operation efficiency.

[0040] Those of ordinary skill in the art should understand that: The discussion of any of the above embodiments is only exemplary and is not intended to imply that the scope (including the claims) disclosed by the embodiments of the present invention is limited to these examples; Under the idea of the embodiments of the present invention, the technical features in the above embodiments or different embodiments can also be combined, and there are many other variations in different aspects of the embodiments of the present invention as described above, which are not provided in detail for the sake of brevity. Therefore, any omission, modification, equivalent replacement, improvement, etc. made within the spirit and principle of the embodiments of the present invention shall be included within the protection scope of the embodiments of the present invention.

Claims

1. A method for recovering multi-grade titanium concentrate and high-quality vanadium-titanium iron concentrate, characterized in that, Comprising: After the first grinding of the vanadium-titanium magnetite raw material, weak magnetic separation is carried out to obtain coarse-grained weak magnetic separation concentrate and coarse-grained weak magnetic separation tailings, and based on the coarse-grained weak magnetic separation tailings, coarse-grained titanium concentrate with a particle size greater than 0.1 mm is obtained, wherein the grinding fineness of the first grinding is that -0.074 mm accounts for 30%-40%; After the second grinding of the coarse-grained weak magnetic separation concentrate, weak magnetic separation is carried out to obtain fine-grained weak magnetic separation concentrate and fine-grained weak magnetic separation tailings, and based on the fine-grained weak magnetic separation tailings, fine-grained titanium concentrate with a particle size of 0.074-0.038 mm is obtained, wherein the grinding fineness of the second grinding is that -0.074 mm accounts for 50%-60%; After the third grinding of the fine-grained weak magnetic separation concentrate, magnetic separation is carried out to obtain magnetic separation concentrate as vanadium-titanium iron concentrate and magnetic separation tailings, and based on the magnetic separation tailings, ultra-fine-grained titanium concentrate with a particle size less than 0.038 mm is obtained, wherein the grinding fineness of the third grinding is that -0.074 mm accounts for 90%-100%; Wherein, short cylindrical nano-ceramic media are used for the first grinding, and spherical nano-ceramic media are used for the second grinding and the third grinding; the short cylindrical nano-ceramic media used for the first grinding are a mixture of three different specifications of short cylindrical grinding media. Among them, the ratios of the axial dimension to the radial dimension of the first specification, the second specification, and the third specification of the short cylindrical grinding media are 1.15, 1.2, and 1.3 respectively, and in the total short cylindrical grinding media, the mass fraction of the third specification of the short cylindrical grinding media is 40%, and the mass fractions of the first specification and the second specification of the short cylindrical grinding media are both 30%.

2. The method according to claim 1, wherein The obtaining of the coarse-grained titanium concentrate with a particle size greater than 0.1 mm based on the coarse-grained weak magnetic separation tailings includes: Using a cyclone to perform the first classification on the coarse-grained weak magnetic separation tailings to obtain first sand and first overflow; Performing spiral gravity separation on the first sand to obtain spiral concentrate as the coarse-grained titanium concentrate and spiral middlings.

3. The method according to claim 2, wherein Performing the second grinding on the coarse-grained weak magnetic separation concentrate and the spiral middlings and then performing the weak magnetic separation to obtain the fine-grained weak magnetic separation concentrate and the fine-grained weak magnetic separation tailings.

4. The method according to claim 2, wherein The obtaining of the fine-grained titanium concentrate with a particle size of 0.074-0.038 mm based on the fine-grained weak magnetic separation tailings includes: Using a cyclone to perform the second classification on the fine-grained weak magnetic separation tailings and the first overflow to obtain second sand and second overflow; Performing the first high-intensity magnetic separation on the second sand to obtain first high-intensity magnetic separation concentrate; Performing the first flotation on the first high-intensity magnetic separation concentrate to obtain first flotation concentrate as the fine-grained titanium concentrate.

5. The method according to claim 4, characterized in that, The obtaining of the ultra-fine-grained titanium concentrate with a particle size less than 0.038 mm based on the magnetic separation tailings includes: Performing the second high-intensity magnetic separation on the magnetic separation tailings and the second overflow to obtain second high-intensity magnetic separation concentrate; Using a cyclone to perform the third classification on the second high-intensity magnetic separation concentrate to obtain third sand; Performing the second flotation on the third sand to obtain second flotation concentrate as the ultra-fine-grained titanium concentrate.

6. The method according to claim 5, wherein, The classification particle size of the first classification is 0.074 mm; and / or The classification particle size of the second classification is 0.038 mm; and / or The classification particle size of the third classification is 0.010 mm.

7. The method according to claim 5, wherein The classification pressure of the hydrocyclone for the first classification is 0.05 - 0.1 Mpa, the diameter of the overflow pipe is 150 - 200 mm, and the diameter of the sand settling port is 40 - 60 mm; and / or The classification pressure of the hydrocyclone for the second classification is 0.1 - 0.2 Mpa, the diameter of the overflow pipe is 25 - 35 mm, and the diameter of the sand settling port is 8 - 15 mm; and / or The classification pressure of the hydrocyclone for the third classification is 0.2 - 0.3 Mpa, the diameter of the overflow pipe is 20 - 25 mm, and the diameter of the sand settling port is 8 - 12 mm.

8. The method according to claim 1, characterized in that The weak magnetic separation is carried out after the first grinding of the vanadium-titanium magnetite raw material, including: carrying out two-stage weak magnetic separation on the material after the first grinding, the magnetic field intensity of the first-stage weak magnetic separation is 3000 - 4000 Oe, and the magnetic field intensity of the second-stage weak magnetic separation is 2500 - 3000 Oe; and / or The weak magnetic separation is carried out after the second grinding of the coarse-grained weak magnetic separation concentrate, including: carrying out two-stage weak magnetic separation on the material after the second grinding, the magnetic field intensity of the first-stage weak magnetic separation is 3000 - 4000 Oe, and the magnetic field intensity of the second-stage weak magnetic separation is 2500 - 3000 Oe.

9. The method according to claim 1, wherein The weak magnetic separation is carried out after the second grinding of the coarse-grained weak magnetic separation concentrate, including: screening the material after the second grinding, and carrying out the weak magnetic separation on the material passing through the screen, wherein the screen hole size is 0.125 mm.

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