Method for recleaning titanium concentrate from vanadium titano-magnetite titanium separation tailings and obtained titanium concentrate

Abstract

The invention discloses a method for recleaning titanium concentrate from vanadium titano-magnetite titanium separation tailings and the obtained titanium concentrate, and belongs to the technical field of tailings recovery. The method comprises the following specific processes: (1) carrying out first-stage weak magnetic iron removal treatment on titanium separation tailing pulp, and then carrying out strong magnetic treatment; (2) tailings obtained through strong magnetic treatment are screened, then are ground, and then are subjected to second-stage weak magnetic iron removal treatment; (3) after the second-stage weak magnetic iron removal treatment, performing first-stage gravity separation treatment to obtain first-stage gravity separation concentrate and first-stage gravity separation tailings, performing second-stage gravity separation treatment on the first-stage gravity separation tailings to obtain second-stage gravity separation concentrate, and combining the first-stage gravity separation concentrate with the second-stage gravity separation concentrate to obtain a floating material; and (4) carrying out desulfurization and titanium flotation treatment on the flotation material obtained in the step (3) to obtain titanium concentrate. According to the method, high-grade and high-yield titanium concentrate is finally obtained through first-stage weak magnetic treatment, strong magnetic treatment, second-stage weak magnetic treatment, first-stage reselection, second-stage reselection, desulfurization and titanium flotation treatment.

Description

Technical Field

[0001] The invention belongs to the technical field of tailings recovery, and in particular relates to a method for re-selecting titanium concentrate from titanium tailings of vanadium-titanium magnetite and the obtained titanium concentrate. Background Art

[0002] The main metal elements in the Ruidi tailings are iron and titanium, with trace amounts of chromium, manganese, cobalt, nickel, etc., among which the Fe grade is 10.18%, the TiO2 grade is 1.99%, and titanium mainly exists in the form of ilmenite mineral phase, with a distribution rate of 82.87%; the ilmenite in the Ruidi tailings is relatively fine, mainly distributed in the particle size range of -0.16mm, and the difficult-to-select particle size of less than 0.01mm accounts for 21.15%; the ilmenite increases with the decrease of ore particle size, and the dissociation degree of all particle sizes is 76.18%.

[0003] The titanium minerals in the Ruidi tailings are mainly ilmenite, followed by a small amount of titanomagnetite and sphene, etc.; the sulfide minerals are mainly pyrrhotite; the gangue minerals are mainly plagioclase, chlorite, olivine, common pyroxene, etc. The particle sizes of ilmenite, titanomagnetite and sulfide are all fine, mainly distributed in the particle size range of -0.16mm, -0.08mm and -0.16mm respectively, and the difficult-to-select particles less than 0.01mm account for 21.15%, 28.27% and 24.01% respectively.

[0004] The dissociation degrees of ilmenite, titanomagnetite and sulfide are 76.18%, 53.15% and 57.76% respectively. The dissociation degrees of the three types of minerals increase with the decrease of ore particle size. When the ore particle size is less than 0.045mm, the particle size dissociation degree of the three types of minerals exceeds 90%. The dissociation degrees of the three types of minerals in coarse-grained ore are all low. If the recovery of ilmenite in coarse-grained ore is to be achieved, it must be dissociated by grinding. In general, the content of ilmenite minerals in Ruidi tailings is small, the mineral embedding particle size is fine, the monomer dissociation degree is low, and it is difficult to select. Summary of the invention

[0005] In view of the above-mentioned deficiencies in the prior art, the present invention provides a method for selecting titanium concentrate from tailings of vanadium-titanium magnetite and the obtained titanium concentrate, which can recover titanium concentrate from tailings and effectively improve the utilization rate of metal resources.

[0006] To achieve the above purpose, the technical solution adopted by the present invention to solve the technical problem is:

[0007] The object of the present invention is to provide a method for selecting titanium tailings from vanadium-titanium magnetite and then selecting titanium concentrate, comprising the following steps:

[0008] (1) subjecting the titanium tailings slurry to a weak magnetic iron removal treatment and then to a strong magnetic treatment;

[0009] (2) The tailings obtained by the strong magnetic treatment are screened and then ground to a particle size of -0.12 to -0.18 mm, and then subjected to a two-stage weak magnetic iron removal treatment;

[0010] (3) After the second stage of weak magnetic iron removal treatment, the first stage of gravity separation treatment is carried out to obtain the first stage of gravity separation concentrate and the first stage of gravity separation tailings. The first stage of gravity separation tailings is carried out to the second stage of gravity separation treatment to obtain the second stage of gravity separation concentrate. The first stage of gravity separation concentrate and the second stage of gravity separation concentrate are combined to obtain the floating material;

[0011] (4) Desulfurizing and titanium floating treatment are performed on the floating material obtained in step (3) to obtain titanium concentrate.

[0012] The raw ore (titanium tailings) used in the present invention has a TiO2 grade of 1.99% and a yield of 100%. During the treatment, a 1 mm slag separation measure is first performed to isolate a portion of coarse slag, which has a low grade of only 1.27% and will affect subsequent ore dressing. After the coarse slag is isolated, the concentrate is subjected to a weak magnetic iron removal process with a magnetic field strength of 2500 GS to remove iron from the ore. Since vanadium-titanium magnetite is a symbiotic mineral of iron and titanium, excessive iron will affect the grade of titanium.

[0013] After weak magnetic iron removal, the concentrate ore enters the strong magnetic process. The magnetic field strength of the strong magnetic separator is 8000GS, which is used to discard the tailings and select the products. After strong magnetic tailings and selecting the products, the ore enters the screening + ball milling process. The screening equipment is a high-frequency vibrating screen with a screen size of 0.12mm. After the minerals are screened, the minerals on the screen enter the ball mill. After the ball mill is ground, it enters the high-frequency vibrating screen, which is used to further improve the dissociation degree of the ore and better recover the titanium in the ore for the subsequent process. During the grinding process, as the re-grinding particle size decreases, the yield of the strong magnetic concentrate decreases and the TiO2 grade increases. When the grinding is to -0.12mm, it is the best processing process. As the grinding particle size decreases, the yield of the shaking table concentrate increases, the TiO2 grade increases, and the recovery rate increases. It also shows that as the grinding particle size decreases, the released ilmenite monomer increases, which is convenient for the subsequent acquisition of floating materials.

[0014] After being concentrated, the undersize minerals of the high-frequency vibrating screen enter the second stage of weak magnetic iron removal. The magnetic field strength is 3000GS. Its function is to further remove the high-iron minerals produced by grinding and improving the dissociation degree in the ball milling process, and finally obtain the magnetic separation part product with a TiO2 grade of 3.09% and a yield of 47.62%. After the strong magnetic separation, it enters the gravity separation process, and the obtained TiO2 grade of 3.09% and the yield of 47.62% of the magnetic separation part product enters the spiral chute gravity separation as the original ore. The gravity separation part is divided into two sections. First, the magnetic separation part product enters the first spiral chute. The gravity separation process is divided into one roughing selection, two scavenging selections, and two concentrating selections. The first gravity separation concentrate with a TiO2 grade of 17.48% and a yield of 2.17% is selected. The tailings of the first gravity separation enter the second spiral chute. The second gravity separation process is divided into one roughing selection, two scavenging selections, and two concentrating selections. The second gravity separation concentrate with a TiO2 grade of 11.89% and a yield of 2.74% is obtained. The first stage gravity separation concentrate and the second stage gravity separation concentrate are finally mixed together to form a gravity separation concentrate with a TiO2 grade of 14.36% and a yield of 4.91% as the floating material. The floating material is then processed by desulfurization and titanium flotation to finally obtain titanium concentrate.

[0015] Furthermore, before the weak magnetic iron removal treatment in step (1), the titanium tailings need to be subjected to slag separation treatment to obtain a rough titanium tailings concentrate.

[0016] Furthermore, the magnetic field strength of the weak magnetic iron removal treatment in step (1) is 1500-3000 GS.

[0017] Furthermore, the magnetic field intensity of the weak magnetic iron removal treatment in step (1) is 2500 GS.

[0018] Furthermore, the magnetic field intensity of the strong magnetic treatment in step (1) is 8000-10000 GS, and the ore pulp concentration of the feed ore is 30-50%.

[0019] Furthermore, the magnetic field intensity of the strong magnetic treatment in step (1) is 8000 GS, and the ore pulp concentration of the feed ore is 40%.

[0020] Furthermore, the magnetic field intensity of the second stage weak magnetic iron removal treatment in step (2) is 3000-5000 GS.

[0021] Furthermore, the magnetic field intensity of the second stage weak magnetic iron removal treatment in step (2) is 3000 GS.

[0022] Furthermore, the first-stage gravity separation and the second-stage gravity separation are both carried out in the spiral chute, and the processing process is one roughing, two sweeping, and two concentrating.

[0023] Furthermore, in step (4), the desulfurization time is 15 minutes, and the reagents used include sulfuric acid, butyl xanthate and 2# oil, and the weight ratio of their usage to the floating material is: sulfuric acid 500-1000 g / t; butyl xanthate 200-500 g / t; 2# oil 50-100 g / t.

[0024] Furthermore, in step (4), the weight ratio of the desulfurization agent to the floating material is: sulfuric acid 1000 g / t; butyl xanthate 300 g / t; 2# oil 50 g / t.

[0025] Furthermore, in step (4), the titanium flotation treatment is firstly subjected to a roughing process, and then four fine processes are sequentially carried out.

[0026] Furthermore, the reagents used include sulfuric acid, collector Uti 3# and diesel, and the weight ratio of their usage to the floating material is: sulfuric acid 500-1000g / t, collector Uti 3# 1500-2000g / t, diesel 200-800g / t.

[0027] Furthermore, in step (4), the weight ratio of the reagent used for titanium floating to the floating material is: sulfuric acid 1000g / t, collector Uti 3# 1600g / t, diesel 400g / t.

[0028] Another object of the present invention is to provide a titanium concentrate obtained by reselection using the above method.

[0029] Beneficial effects of the present invention:

[0030] The present invention can finally obtain qualified titanium concentrate with an operating yield of 1.18%, a TiO2 grade of 46.67% and an operating recovery rate of 27.67% through one-stage weak magnetic, strong magnetic, two-stage weak magnetic, one-stage gravity separation, two-stage gravity separation, desulfurization and titanium flotation treatment. DETAILED DESCRIPTION

[0031] The specific implementation modes of the present invention are described below so that those skilled in the art can understand the present invention. However, it should be clear that the present invention is not limited to the scope of the specific implementation modes. For those of ordinary skill in the art, as long as various changes are within the spirit and scope of the present invention as defined and determined by the attached claims, these changes are obvious, and all inventions and creations utilizing the concept of the present invention are protected.

[0032] Example 1

[0033] A method for selecting titanium tailings from vanadium-titanium magnetite and then selecting titanium concentrate comprises the following steps:

[0034] (1) 20 kg of Ruidi tailings were taken, and the coarse slag of +1 mm was removed by manual screening to make a slurry with a concentration of 30%. After being stirred evenly, it was fed into a drum magnetic separator at a feed rate of 160 kg / h to perform a weak magnetic iron removal in an environment with a magnetic field strength of 2500 GS;

[0035] (2) The concentrate obtained by the weak magnetic iron removal is pumped into the SSS-I-500 vertical ring high gradient magnetic separator (single ring) for strong magnetic tailing treatment in an environment with a magnetic field strength of 8000GS, and the feed concentration is 40%;

[0036] (3) Screening the concentrate obtained by strong magnetic treatment, and then grinding the coarse particles with an XMQ240×90 ball mill, controlling the grinding time for 3 minutes each time and the grinding concentration to 50%, until the particle size is 0.12 mm;

[0037] (4) placing the ore concentrate after grinding in a drum magnetic separator with a magnetic field strength of 3000GS for two-stage weak magnetic iron removal treatment, and then entering a spiral chute for gravity separation. The gravity separation part is divided into two stages. First, the magnetic separation part product enters a spiral chute. The gravity separation process is divided into a roughing selection, a scavenging selection, and a concentrating selection to obtain a gravity separation concentrate and a gravity separation tailing. The gravity separation tailing enters a second spiral chute. The second gravity separation process is divided into a roughing selection, a scavenging selection, and a concentrating selection to obtain a gravity separation concentrate. The gravity separation concentrate formed by mixing the gravity separation concentrate of the first stage and the gravity separation concentrate of the second stage is used as the floating material.

[0038] (5) Desulfurization treatment is performed on the floating material for 15 minutes. The reagents used include sulfuric acid, butyl xanthate and 2# oil. The weight ratio of the reagents used to the floating material is: sulfuric acid 1000g / t; butyl xanthate 300g / t; 2# oil 50g / t;

[0039] (6) The desulfurized floating material is subjected to titanium flotation treatment, including one roughing and four fine cleaning processes. The reagents used include sulfuric acid, collector Uti 3# and diesel. The weight ratio of the amount used to the floating material is: sulfuric acid 1000 g / t, collector Uti 3# 1600 g / t, diesel 400 g / t. After the titanium flotation treatment, titanium concentrate is obtained.

[0040] Example 2

[0041] A method for selecting titanium tailings from vanadium-titanium magnetite and then selecting titanium concentrate comprises the following steps:

[0042] (1) 20 kg of Ruidi tailings were taken, and the coarse slag of +1 mm was removed by manual screening to make a slurry with a concentration of 30%. After being stirred evenly, it was fed into a drum magnetic separator at a feed rate of 160 kg / h to perform a weak magnetic iron removal in an environment with a magnetic field strength of 1500 GS;

[0043] (2) The concentrate obtained by the weak magnetic iron removal is pumped into the SSS-Ⅰ-500 vertical ring high gradient magnetic separator (single ring) for strong magnetic tailing treatment in an environment with a magnetic field strength of 10000GS;

[0044] (3) Screening the concentrate obtained by strong magnetic treatment, and then grinding the coarse particles with an XMQ240×90 ball mill, controlling the grinding time for 3 minutes each time and the grinding concentration to 50%, until the particle size is 0.12 mm;

[0045] (4) placing the ore concentrate after grinding in a drum magnetic separator with a magnetic field strength of 5000GS for two-stage weak magnetic iron removal treatment, and then entering a spiral chute for gravity separation. The gravity separation part is divided into two stages. First, the magnetic separation part product enters a spiral chute. The gravity separation process is divided into a roughing selection, a scavenging selection, and a concentrating selection to obtain a gravity separation concentrate and a gravity separation tailing. The gravity separation tailing enters a second spiral chute. The second gravity separation process is divided into a roughing selection, a scavenging selection, and a concentrating selection to obtain a gravity separation concentrate. The gravity separation concentrate formed by mixing the gravity separation concentrate of the first stage and the gravity separation concentrate of the second stage is used as the floating material.

[0046] (5) Desulfurization treatment is performed on the floating material for 15 minutes. The reagents used include sulfuric acid, butyl xanthate and 2# oil. The weight ratio of the reagents used to the floating material is: sulfuric acid 500g / t; butyl xanthate 200g / t; 2# oil 100g / t;

[0047] (6) The desulfurized floating material is subjected to titanium flotation treatment, including one roughing and four fine cleaning processes. The reagents used include sulfuric acid, collector Uti 3# and diesel. The weight ratio of the amount used to the floating material is: sulfuric acid 500 g / t, collector Uti 3# 1500 g / t, diesel 200 g / t. After the titanium flotation treatment, titanium concentrate is obtained.

[0048] Example 3

[0049] A method for selecting titanium tailings from vanadium-titanium magnetite and then selecting titanium concentrate comprises the following steps:

[0050] (1) 20 kg of Ruidi tailings were taken, and the coarse slag of +1 mm was removed by manual screening to make a slurry with a concentration of 30%. After being stirred evenly, it was fed into a drum magnetic separator at a feed rate of 160 kg / h to perform a weak magnetic iron removal in an environment with a magnetic field strength of 3000 GS;

[0051] (2) The concentrate obtained by the weak magnetic iron removal is pumped into the SSS-Ⅰ-500 vertical ring high gradient magnetic separator (single ring) and subjected to strong magnetic tailing treatment in an environment with a magnetic field strength of 9000GS;

[0052] (3) Screening the concentrate obtained by strong magnetic treatment, and then grinding the coarse particles with an XMQ240×90 ball mill, controlling the grinding time for 3 minutes each time and the grinding concentration to 50%, until the particle size is 0.12 mm;

[0053] (4) placing the ore concentrate after grinding in a drum magnetic separator with a magnetic field strength of 4000GS for two-stage weak magnetic iron removal treatment, and then entering a spiral chute for gravity separation. The gravity separation part is divided into two stages. First, the magnetic separation part product enters a spiral chute. The gravity separation process is divided into a roughing selection, a scavenging selection, and a concentrating selection to obtain a gravity separation concentrate and a gravity separation tailing. The gravity separation tailing enters a second spiral chute. The second gravity separation process is divided into a roughing selection, a scavenging selection, and a concentrating selection to obtain a gravity separation concentrate. The gravity separation concentrate formed by mixing the gravity separation concentrate of the first stage and the gravity separation concentrate of the second stage is used as the floating material;

[0054] (5) Desulfurization treatment is performed on the floating material for 15 minutes. The reagents used include sulfuric acid, butyl xanthate and 2# oil. The weight ratio of the reagents used to the floating material is: sulfuric acid 8000 g / t; butyl xanthate 500 g / t; 2# oil 80 g / t;

[0055] (6) The desulfurized floating material is subjected to titanium flotation treatment, including one roughing and four fine cleaning processes. The reagents used include sulfuric acid, collector Uti 3# and diesel. The weight ratio of the amount used to the floating material is: sulfuric acid 8000 g / t, collector Uti 3# 2000 g / t, diesel 800 g / t. After the titanium flotation treatment, titanium concentrate is obtained.

[0056] Example 4

[0057] A method for selecting titanium tailings from vanadium-titanium magnetite and then selecting titanium concentrate comprises the following steps:

[0058] (1) 20 kg of Ruidi tailings were taken, and the coarse slag of +1 mm was removed by manual screening to make a slurry with a concentration of 30%. After being stirred evenly, it was fed into a drum magnetic separator at a feed rate of 160 kg / h to perform a weak magnetic iron removal in an environment with a magnetic field strength of 3000 GS;

[0059] (2) The concentrate obtained by the weak magnetic iron removal is pumped into the SSS-Ⅰ-500 vertical ring high gradient magnetic separator (single ring) and subjected to strong magnetic tailing treatment in an environment with a magnetic field strength of 8000GS;

[0060] (3) Screening the concentrate obtained by strong magnetic treatment, and then grinding the coarse particles with an XMQ240×90 ball mill, controlling the grinding time for 3 minutes each time and the grinding concentration to 50%, until the particle size is 0.12 mm;

[0061] (4) placing the ore concentrate after grinding in a drum magnetic separator with a magnetic field strength of 4000GS for two-stage weak magnetic iron removal treatment, and then entering a spiral chute for gravity separation. The gravity separation part is divided into two stages. First, the magnetic separation part product enters a spiral chute. The gravity separation process is divided into a roughing selection, a scavenging selection, and a concentrating selection to obtain a gravity separation concentrate and a gravity separation tailing. The gravity separation tailing enters a second spiral chute. The second gravity separation process is divided into a roughing selection, a scavenging selection, and a concentrating selection to obtain a gravity separation concentrate. The gravity separation concentrate formed by mixing the gravity separation concentrate of the first stage and the gravity separation concentrate of the second stage is used as the floating material;

[0062] (5) Desulfurization treatment is performed on the floating material for 15 minutes. The reagents used include sulfuric acid, butyl xanthate and 2# oil. The weight ratio of the reagents used to the floating material is: sulfuric acid 8000 g / t; butyl xanthate 500 g / t; 2# oil 50 g / t;

[0063] (6) The desulfurized floating material is subjected to titanium flotation treatment, including one roughing and four fine cleaning processes. The reagents used include sulfuric acid, collector Uti 3# and diesel. The weight ratio of the reagents used to the floating material is: sulfuric acid 1000 g / t, collector Uti 3# 1500 g / t, diesel 200 g / t. After the titanium flotation treatment, titanium concentrate is obtained.

[0064] Comparative Example 1

[0065] Compared with Example 1, the gravity separation treatment is replaced by gradient strong magnetic treatment, the magnetic field strength of the gradient strong magnetic treatment is 0.3T and 0.15T respectively, and the rest of the process is the same as Example 1.

[0066] Comparative Example 2

[0067] Compared with Example 1, the gravity separation treatment is replaced by shaking table treatment and gradient strong magnetic treatment. The magnetic field strength of the gradient strong magnetic treatment is 0.4T, 0.2T, and 0.15T respectively. The rest of the process is the same as Example 1.

[0068] Comparative Example 3

[0069] Compared with Example 1, only one stage of gravity separation is performed, and multi-stage strong magnetic treatment is used to replace the two-stage gravity separation. The magnetic field strength of the multi-stage strong magnetic treatment is 0.8T, 0.8T, and 0.4T respectively. The rest of the process is the same as Example 1.

[0070] The operating yield, TiO2 grade and operating recovery rate of the floating materials obtained after treatment in Example 1 of the present invention and Comparative Examples 1 to 3 were tested, and the results are shown in Table 1. Then, the quality of the titanium concentrate recovered in Example 1 of the present invention was tested, and the results are shown in Table 2.

[0071] Table 1 Index of floating materials

[0072] Operational yield <![CDATA[TiO2 grade]]> Operation recovery rate Example 1 4.91％ 14.36％ 35.43％ Comparative Example 1 45.06％ 5.92％ 74.97％ Comparative Example 2 24.53％ 9.21％ 63.05％ Comparative Example 3 4.24％ 12.57％ 33.71％

[0073] Table 2 Titanium concentrate quality

[0074] Operational yield <![CDATA[TiO2 grade]]> Operation recovery rate Example 1 1.18％ 46.67％ 27.67％ Comparative Example 3 0.96％ 45.37％ 24.20％

[0075] According to the test data in Table 1, comparative example 1 uses two-stage strong magnetic treatment to replace the gravity separation treatment. Although the strong magnetic process can effectively recover titanium minerals and has a high operating yield and operating recovery rate, the grade of TiO2 after treatment is too low to meet the flotation requirements.

[0076] Comparative Example 2 uses a mixed shaker treated concentrate and a strong magnetic treated concentrate as the flotation flow, but according to the test data in Table 1, the overall concentrate TiO2 grade is still too low, and it cannot meet the flotation grade requirements, and cannot be used as a flotation material. Comparative Example 3 uses a mixture of a one-stage gravity separation concentrate and a multi-stage strong magnetic treatment concentrate as the flotation material, but similarly, according to the test data, the gravity separation concentrate and the gravity separation tailings strong magnetic re-separation concentrate are mixed. The concentrate not only has a lower overall TiO2 grade than Example 1 of the present application, but also has a lower operating recovery rate. Therefore, it cannot meet the requirements of the flotation material.

[0077] According to the test data in Table 2, after the treatment by the technical solution of the present application, the TiO2 grade of the final product reached 46.67%, which is higher than 45.36% of Comparative Example 3, and the operation recovery rate is also higher than that of Comparative Example 3. Moreover, by comparison, it can be seen that the TiO2 grade of the product obtained by the treatment of the technical solution of the present application meets the requirements of titanium concentrate, while the TiO2 grade of the product obtained by the treatment of Comparative Example 3 reaches 45.37%, but it does not meet the requirements of titanium concentrate, and the obtained product cannot be called titanium concentrate.

[0078] In summary, only by using the titanium concentrate reselection process constructed according to the present invention can the flotation material with a grade that meets the flotation requirements be obtained, and finally high-grade and high-yield titanium concentrate be recovered.

[0079] Finally, it should be noted that the above specific implementation methods are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to examples, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A method for selecting titanium tailings from vanadium-titanium magnetite and then selecting titanium concentrate, characterized in that: The following steps are involved: (1) subjecting the titanium tailings slurry to a weak magnetic iron removal treatment and then to a strong magnetic treatment; (2) The tailings obtained by the strong magnetic treatment are screened and then ground to a particle size of -0.12 to -0.18 mm, and then subjected to a two-stage weak magnetic iron removal treatment; (3) After the second stage of weak magnetic iron removal treatment, the first stage of gravity separation treatment is carried out to obtain the first stage of gravity separation concentrate and the first stage of gravity separation tailings. The first stage of gravity separation tailings is carried out to the second stage of gravity separation treatment to obtain the second stage of gravity separation concentrate. The first stage of gravity separation concentrate and the second stage of gravity separation concentrate are combined to obtain the floating material; (4) Desulfurizing and titanium floating treatment are performed on the floating material obtained in step (3) to obtain titanium concentrate.

2. The method for selecting titanium concentrate from vanadium-titanium magnetite tailings according to claim 1, characterized in that: Before the weak magnetic iron removal treatment in step (1), the titanium tailings need to be subjected to slag separation treatment to obtain a rough titanium tailings concentrate.

3. The method for selecting titanium concentrate from vanadium-titanium magnetite tailings according to claim 1, characterized in that: The magnetic field strength of the weak magnetic iron removal treatment in step (1) is 1500-3000 GS.

4. The method for selecting titanium concentrate from vanadium-titanium magnetite tailings according to claim 1, characterized in that: In step (1), the magnetic field intensity of the strong magnetic treatment is 8000-10000 GS, and the ore pulp concentration of the feed ore is 30-50%.

5. The method for selecting titanium concentrate from tailings of vanadium-titanium magnetite according to claim 4, characterized in that: The magnetic field intensity of the strong magnetic treatment in step (1) is 8000 GS, and the ore pulp concentration of the feed ore is 40%.

6. The method for selecting titanium concentrate from vanadium-titanium magnetite tailings according to claim 1, characterized in that: The magnetic field intensity of the second stage weak magnetic iron removal treatment in step (2) is 3000-5000GS.

7. The method for selecting titanium concentrate from tailings of vanadium-titanium magnetite according to claim 1, characterized in that: Both the first-stage gravity separation and the second-stage gravity separation are carried out in the spiral chute, and the processing process is one roughing, two sweeping, and two concentrating.

8. The method for selecting titanium concentrate from tailings of vanadium-titanium magnetite according to claim 1, characterized in that: The desulfurization agents used in step (4) include sulfuric acid, butyl xanthate and 2# oil, and the weight ratio of their usage to the floating material is: sulfuric acid 500-1000 g / t; butyl xanthate 200-500 g / t; 2# oil 50-100 g / t.

9. The method for selecting titanium concentrate from tailings of vanadium-titanium magnetite according to claim 1, characterized in that: The reagents used for titanium flotation in step (4) include sulfuric acid, collector Uti 3# and diesel, and the weight ratio of their usage to the floating material is: sulfuric acid 500-1000g / t, collector Uti 3# 1500-2000g / t, diesel 200-800g / t.

10. Titanium concentrate obtained by the method according to any one of claims 1 to 9.