Method for recovering titanium from vanadium titano-magnetite tailings

Abstract

The invention relates to the technical field of mineral processing, and particularly discloses a method for recovering titanium from vanadium titano-magnetite tailings, which comprises the following steps: carrying out size classification by adopting a high-frequency vibrating screen, carrying out table gravity separation on products with different size fractions and whole size fractions, and preliminarily separating out heavy mineral components; according to the magnetic strength of the minerals, the magnetic minerals are separated gradually, and the non-magnetic minerals are thrown away; the optimal field intensity is determined, shaking table gravity separation is conducted on the heavy minerals of the selected size fraction, and high-intensity magnetic separation impurity removal is conducted on obtained concentrate; the magnetic separation concentrate is subjected to desulfurization flotation, a collecting agent and a foaming agent are sequentially added, and sulfide ore is obtained after roughing and scavenging; carrying out titanium flotation on the desulfurized and floated tailings, collecting, controlling the roughing concentration, the flotation fineness and the concentration, and carrying out titanium flotation by adopting one-time roughing and five-time concentration; and concentrate obtained after separation is subjected to low-intensity magnetic separation iron removal to obtain titanium concentrate, and the problem that in the prior art, micro-grade ilmenite is difficult to recycle is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of mineral processing, and particularly relates to a method for recovering titanium from vanadium-titanium magnetite tailings. Background Art

[0002] Titanium is an important metal resource, which has the characteristics of light weight, high strength, acid and alkali resistance, and corrosion resistance, and is widely used in high-speed rail, aerospace, navigation, coatings and other fields.

[0003] Chengde area is one of the important vanadium-titanium magnetite resource bases in China, and its titanium resources mainly exist in the forms of titanomagnetite and ilmenite. At present, the "gravity separation - magnetic separation - flotation" combined process is mainly used in this area to recover titanium resources. Among them, titanomagnetite is recovered by the stage grinding and magnetic separation process, and the ilmenite in the iron tailings is treated by the high-intensity magnetic - high-intensity magnetic - flotation process. The current titanium resource recovery method leads to a large amount of fine-grained ilmenite being generated during the separation process, and it is lost in the tailings in the form of slime, overflow, etc. At the same time, some ilmenite is also lost in the tailings in the form of coarse-grained associated minerals, resulting in a large amount of titanium resource loss.

[0004] At present, the main methods for recovering titanium resources from vanadium-titanium magnetite tailings are "high-intensity magnetic - classified grinding - high-intensity magnetic - flotation" and "high-intensity magnetic - grinding - high-intensity magnetic - shaking table". However, due to the difficulty of effectively recovering fine-grained ilmenite by existing magnetic separation, gravity separation and other processes, it is difficult to obtain ideal beneficiation indexes.

[0005] Therefore, there is an urgent need for a process that can recover titanium from vanadium-titanium magnetite tailings to improve the utilization rate of titanium in vanadium-titanium magnetite in Chengde area. Summary of the Invention

[0006] The purpose of the present invention is to provide a method for recovering titanium from vanadium-titanium magnetite tailings to solve the problems in the above background.

[0007] The purpose of the present invention can be achieved by the following technical solutions:

[0008] A method for recovering titanium from vanadium-titanium magnetite tailings, comprising the following steps:

[0009] Step 1: Use a high-frequency vibrating screen for particle size classification to obtain products of different particle sizes; perform shaking table gravity separation on products of different particle sizes and all particle sizes, and preliminarily separate the heavy mineral components;

[0010] Step 2: Successively separate the magnetic minerals according to the magnetic strength of the minerals, and discard the non-magnetic minerals; determine the optimal magnetic field strength, perform shaking table gravity separation on the heavy minerals of the selected particle size, and perform high-intensity magnetic separation on the obtained concentrate to remove impurities;

[0011] Step 3: The magnetically separated concentrate is further subjected to desulfurization flotation. Lime is added to adjust the pH value of the pulp to 9, and then a collector and a frother are added in sequence. After roughing and scavenging, sulfide ores are obtained.

[0012] Then, the tailings after desulfurization flotation are subjected to titanium flotation and collection. The roughing concentration, the fineness of the feed to flotation, and the cleaning concentration are controlled, and one roughing and five cleanings are used for titanium flotation.

[0013] Step 4: The concentrate obtained after separation is subjected to weak magnetic separation to remove iron to obtain titanium concentrate.

[0014] As a further solution of the present invention: in the said Step 1, 6-S shaking tables are used to process the near-shaking table gravity separation experiments for products of different particle sizes and all particle sizes; among them, the roughing feed concentration is 25%, and the cleaning feed concentration is 30%.

[0015] As a further solution of the present invention: the way to gradually separate magnetic minerals and discard non-magnetic minerals in the said Step 2 is: separating magnetite minerals from other minerals through weak magnetism, and then pre-separating non-magnetic minerals through high-intensity magnetic separation to achieve titanium enrichment.

[0016] As a further solution of the present invention: the weak magnetism in the said Step 2 uses a magnetic field intensity of 1300 GS;

[0017] High-intensity magnetic separation respectively uses three high-intensity magnetic combinations of magnetic separation field intensities of 13000 + 10000 GS, 10000 + 8000 GS, and 8000 + 6000 GS to separate the pre-enriched titanium by high-intensity magnetic separation.

[0018] As a further solution of the present invention: in the said Step 2, particle sizes less than 0.3 mm are selected for shaking table gravity separation, and the obtained concentrate is subjected to high-intensity magnetic separation tests.

[0019] As a further solution of the present invention: in the said Step 2, a magnetic field intensity of 6000 GS is selected, and the TiO2 grade in the obtained high-intensity magnetic concentrate is 2.82%.

[0020] As a further solution of the present invention: in the said Step 3, the magnetically separated concentrate is subjected to desulfurization flotation, and an XFD II type single-tank flotation device is used; the collector is selected as isoamyl xanthate, and its total dosage is 100 g / t; the frother is selected as No. 2 oil, and its total dosage is 30 g / t.

[0021] As a further solution of the present invention: for the tailings after desulfurization flotation in the said Step 3, titanium flotation is carried out. Specifically: sulfuric acid is added to adjust the pH value of the pulp to 5 - 5.5, and a titanium collector is used to selectively collect minerals containing TiO2 and other oxidized minerals.

[0022] As a further solution of the present invention: in the said Step 3, the titanium collector is selected as 8008# titanium collector, and its total dosage is 4000 g / t.

[0023] As a further solution of the present invention: in the third step, the rough selection concentration is controlled at 50%, the fine selection concentration is 40 - 45%, and the floating fineness is 30 - 35%.

[0024] Beneficial effects of the present invention:

[0025] In the present invention, ilmenite that is currently difficult to recover is recovered from the tailings of vanadium-titanium magnetite. The TiO₂ grade is increased from 2.82% to 4.21%, and the operation recovery rate is 21.31%; after the flotation concentrate is weakly magnetically enriched once, the TiO₂ grade is increased from 4.21% to 34.51%, the operation recovery rate is 19.54%, and the total recovery rate is 0.17%, improving the utilization rate of titanium resources in vanadium-titanium magnetite. The TFe grade is increased from 41.86% to 65.49%, and the mFe grade is increased from 35.61 to 61.26%.

[0026] And wide particle size selection is realized. The particle size for selection can reach 0.3 mm, and it has strong adaptability to the particle size of the tailings for selection, solving the problem that fine-grained ilmenite is difficult to recover in the existing process, and can effectively recover ilmenite with a particle size of 30 μm in fine particles. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The present invention will be further described below with reference to the accompanying drawings.

[0028] Figure 1 It is a schematic flow diagram of the method of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0029] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0030] Embodiment 1

[0031] Please refer to Figure 1 As shown, the present invention is a method for recovering titanium from the tailings of vanadium-titanium magnetite, including the following steps:

[0032] Including the following steps:

[0033] Step 1: Perform particle size classification using a high-frequency vibrating screen to obtain products of different particle sizes; perform table concentration on the products of different particle sizes and all particle sizes to preliminarily separate the heavy mineral components;

[0034] Step 2: Separate magnetic minerals successively according to the magnetic strength of the minerals, and discard non-magnetic minerals; determine the optimal magnetic field strength, perform shaking table gravity separation on the heavy minerals of the selected particle size, and perform high-intensity magnetic separation on the obtained concentrate to remove impurities;

[0035] Step 3: Perform desulfurization flotation on the magnetic separation concentrate, add lime to adjust the pH value of the pulp to 9, then add a collector and a frother in sequence, and obtain sulfide ore after rough selection and scavenging;

[0036] Then perform titanium flotation and collection on the tailings after desulfurization flotation, control the rough selection concentration, the grinding fineness for flotation, and the concentration for cleaning, and perform titanium flotation with one rough selection and five cleanings;

[0037] Step 4: Perform weak magnetic separation on the obtained concentrate to remove iron and obtain titanium concentrate.

[0038] Example 2

[0039] Based on the above example, in this example, 400 kg of a certain vanadium-titanium magnetite tailings (TiO2 content 0.91%) was used for titanium recovery. Titanium recovery was carried out by a method for recovering titanium from vanadium-titanium magnetite tailings of the present invention, and the following data was obtained. Specifically, it includes the following steps:

[0040] Use a high-frequency vibrating screen for particle size classification to obtain products of different particle sizes; perform shaking table gravity separation on products of different particle sizes and all particle sizes, compare their enrichment effects, and initially separate the heavy mineral components;

[0041] Take 400 kg of vanadium-titanium magnetite tailings (TiO2 content 0.91%) for treatment. The screen holes of the high-frequency vibrating screen are classified with 0.1 mm, 0.3 mm, and 0.5 mm. At this time, products of particle sizes greater than 0.5 mm, 0.5 mm - 0.3 mm, 0.3 mm - 0.1 mm, and less than 0.1 mm are obtained; use a 6-S shaking table to process the products of different particle sizes and all particle sizes for a shaking table gravity separation experiment; among them, the rough selection feed concentration is 25%, and the cleaning feed concentration is 30%;

[0042] The results of shaking table gravity separation for each particle size obtained by this method are as follows:

[0043]

[0044] As can be seen from the table, in the fine particle size range of this tailings, the enrichment effect of the shaking table is better than that in the coarse particle size range. The enrichment effect is the best in the particle size range less than 0.1 mm. The TiO2 grade of the original ore is increased from 0.74% to 5.10%, and the operation recovery rate is 14.64%;

[0045] In the original tailings, iron minerals and ilmenite are both magnetic. According to the magnetic strength of the minerals, the magnetic minerals are separated successively, and the non-magnetic minerals are discarded. The magnetite minerals are separated from other minerals by weak magnetic separation, and then the non-magnetic minerals can be pre-separated by strong magnetic separation to achieve the purpose of titanium enrichment. Different gradient field strengths are used for research to determine the optimal field strength; then the heavy minerals of the selected particle size are separated by a shaking table, and the obtained concentrate is subjected to strong magnetic separation to remove impurities;

[0046] In this step, a field strength of 1300 GS is used for weak magnetic separation, and three strong magnetic combinations of 13000 + 10000 GS, 10000 + 8000 GS, and 8000 + 6000 GS are used for strong magnetic separation to pre-enrich titanium;

[0047] The results of magnetic field enrichment and gravity separation in this step are as follows:

[0048]

[0049] As can be seen from the table, the titanium enrichment effect of the tailings in the strong magnetic combination of 8000 + 6000 GS is better than the other two combinations. The TiO2 grade of the original ore is increased from 0.91% to 1.28% in the strong magnetic middlings, and the total recovery rate is 1.3719%. In the subsequent experiments, gravity separation is used for pre-enrichment first, and then a magnetic separation-flotation process is carried out;

[0050] To ensure the feeding amount for flotation, the particle size less than 0.3 mm is selected for gravity separation by a shaking table, and the obtained concentrate is subjected to strong magnetic separation test with a field strength of 6000 GS. The TiO2 grade in the obtained strong magnetic concentrate is 2.82%;

[0051] The magnetic separation concentrate is then subjected to desulfurization flotation. Lime (CaO) is added to adjust the pH value of the pulp to 9, and then a collector and a frother are added in sequence. After roughing and scavenging, sulfide ores are obtained; among them, the magnetic separation concentrate is subjected to desulfurization flotation using an XFDII type single-cell flotation device; the collector is selected as isoamyl xanthate, and its total dosage is 100 g / t; the frother is selected as No. 2 oil, and its total dosage is 30 g / t;

[0052] The tailings after desulfurization flotation are then subjected to titanium flotation. Similarly, an XFDI I type single-cell flotation device is also used in this step. Sulfuric acid (H2SO4) is added to adjust the pH value of the pulp to 5 - 5.5. A titanium collector is used to selectively collect the minerals containing TiO2 and other oxidized minerals, and the roughing concentration, the fineness of the feed for flotation, and the cleaning concentration are controlled. One roughing and five cleanings are used for titanium flotation;

[0053] Among them, the titanium collector is selected as the 8008# titanium collector, and its total dosage is 4000 g / t. The roughing concentration is controlled at 50%, the cleaning concentration is 40 - 45%, and the fineness of the feed for flotation is 30 - 35%;

[0054] In this step, the experimental results of the flotation process are as follows in the table:

[0055]

[0056] As can be seen from the table, for the titanium flotation of the mixed sample, after one rough selection + five fine selections, the grade of TFe is increased from 41.86% to 65.49%, the grade of mFe is increased from 35.61 to 61.26%; the grade of TiO₂ is increased from 2.82% to 4.21%, and the operation recovery rate is 21.31%;

[0057] The iron in the concentrate obtained after flotation is removed by weak magnetic separation to obtain titanium concentrate;

[0058]

[0059] As can be seen from the table, after one weak magnetic enrichment of the flotation concentrate, the grade of TiO₂ is increased from 4.21% to 34.51%, the operation recovery rate is 19.54%, and the total recovery rate is 0.17%.

[0060] In this solution, ilmenite that is currently difficult to recover is recovered from the tailings of vanadium-titanium magnetite. The grade of TiO₂ is increased from 2.82% to 4.21%, and the operation recovery rate is 21.31%; after one weak magnetic enrichment of the flotation concentrate, the grade of TiO₂ is increased from 4.21% to 34.51%, the operation recovery rate is 19.54%, and the total recovery rate is 0.17%, improving the utilization rate of titanium resources in vanadium-titanium magnetite. The grade of TFe is increased from 41.86% to 65.49%, and the grade of mFe is increased from 35.61 to 61.26%.

[0061] And wide particle size feeding is realized. The feeding particle size can reach 0.3 mm, and it has strong adaptability to the feeding particle size of the tailings, solving the problem that fine-grained ilmenite is difficult to recover in the existing process, and can effectively recover 30 μm ilmenite in fine particles.

[0062] Example 3

[0063] Based on the above example, in this example, desulfurization flotation is carried out on the magnetic separation concentrate in step three. Lime is added to adjust the pH value of the pulp to 9, and then a collector and a frother are added in sequence. After rough selection and scavenging, sulfide ore is obtained; then the tailings after desulfurization flotation are subjected to titanium flotation and collection, and the rough selection concentration, the floating fineness, and the concentration of fine selection are controlled, and one rough selection plus five fine selections are used for titanium flotation; A titanium flotation control method with multi-parameter regulation is provided, including the following steps:

[0064] S1: Install a γ-ray pulp density meter on the pulp pipeline, synchronously connect a flow meter and a speed sensor of the conveyor belt after the vibrating screen, and obtain the density value N at the current moment t in real time t, determine whether the concentration value is within the target range [Nmin, Nmax] to obtain a concentration qualification signal;

[0065] Specifically:

[0066] If the concentration value N t is within the target range [Nmin, Nmax], generate a concentration qualification signal;

[0067] If the concentration value N t is not within the target range [Nmin, Nmax], generate a concentration non - qualification signal;

[0068] When a concentration non - qualification signal appears:

[0069] If the concentration value N t is greater than the concentration upper limit value Nmax, control the dilution water valve to open for real - time water replenishment;

[0070] If the concentration value N t is less than the concentration lower limit value Nmin, automatically increase the efficiency of the feed pump, that is, control the feed rate to increase the concentration;

[0071] S2: Based on the concentration qualification signal, use the configured on - line laser particle size analyzer to sample the pulp after ball milling in real - time and update the particle size curve; obtain the flotation particle size value De; determine whether the flotation particle size value De is within the particle size qualification range [Dmin, Dmax] to obtain a particle size qualification signal;

[0072] Specifically:

[0073] If the flotation particle size value De is within the particle size qualification range [Dmin, Dmax], generate a particle size qualification signal;

[0074] If the flotation particle size value De is not within the particle size qualification range [Dmin, Dmax], generate a particle size non - qualification signal;

[0075] Based on the particle size non - qualification signal, adjust the ball milling process. Specifically:

[0076] If De is less than the minimum qualified particle size Dmin, it means the particle size is too fine. At this time, adjust the feed amount and reduce the ball milling speed to avoid over - grinding;

[0077] If De is greater than the maximum qualified particle size Dmax, it means the particle size is too coarse. At this time, adjust the ball milling current or extend the grinding time;

[0078] S3: Based on the particle size qualification signal, use the X - ray fluorescence analyzer set at the selected flotation outlets of the first, third, and fifth stages to sample the concentrate pulp at an interval of time T and perform non - contact fluorescence scanning to analyze the main component concentration;

[0079] Among them, it should be noted that the concentration of TiO2 obtained adopts a moving average algorithm, that is, the concentration value at the current moment is the average of the three concentration values at the current moment, the previous moment, and the moment before the previous moment;

[0080] At the same time, the outlet grade C3 of the third stage and the outlet grade C5 of the fifth stage are set in this step;

[0081] S4: Obtain the concentration values of TiO2 in the third stage and the fifth stage, denoted as M3 and M5 respectively; and make a judgment;

[0082] If the concentration value M3 of TiO2 in the third stage ≥ 4.2%, at this time, a termination instruction is sent to the PLC, the flotation work of the fourth to sixth stages is automatically stopped, the adjustment data of this batch of number segments is recorded, and analyzed;

[0083] If the concentration value M3 of TiO2 in the fifth stage < 3.8%, it means that the flotation of the first five stages does not meet the ore dressing requirements, and the system needs to start the standby flotation work of the sixth stage;

[0084] Otherwise, judge the growth rate trend of the concentration value of TiO2, predict the grade improvement amplitude of the next stage, and decide whether to continue flotation;

[0085] Specifically: adopt a dynamic regulation method, as follows:

[0086] Obtain the TiO2 grades at the outlets of the first to sixth stage flotation at the current moment t, denoted as Yn respectively;

[0087] Among them, the value of n is 1, 2, 3, 4, 5, 6;

[0088] Take the number of stages as the variable f, where f is 1, 2, 3, 4, 5, 6;

[0089] Then construct a linear fitting model: G = β0 + β1×f + ε; where, β0 is the intercept term, β1 represents the slope term, and ε is the residual term;

[0090] Based on the linear fitting model, calculate the concentration value Y of TiO2 at the next moment t + 1 t+1 ;

[0091] Based on the concentration value Y at the current moment t , through Calculate the concentration growth rate ZY;

[0092] If the concentration growth rate ZY is greater than or equal to the concentration growth rate threshold, maintain flotation;

[0093] If the concentration growth rate ZY is less than the concentration growth rate threshold, stop flotation. At this time, the flotation is automatically ended, saving reagents and energy consumption;

[0094] This flotation strategy, based on predicted trends rather than static concentrations, has the ability of "forward-looking control". By dynamically predicting, it can avoid the continuous operation of ineffective flotation sections, saving reagents, power consumption, and water consumption. If the concentration has reached the standard or there is no hope of increase, it can terminate flotation in time to avoid impurity backflow or resource waste. With the standby sixth-stage flotation unit, it can cope with unexpected decreases in flotation efficiency or grade fluctuations.

[0095] It should be understood that although the vanadium-titanium magnetite tailings still contain valuable components such as iron, titanium, and rare earths, the grade is relatively low. The method of the present invention can effectively improve the recovery rate of titanium.

[0096] It should be specifically pointed out that each component or step in the above various embodiments can be crossed, replaced, added, or deleted with each other. Therefore, the combinations formed by these reasonable permutations and combinations should also fall within the protection scope of the present invention, and the protection scope of the present invention should not be limited to the described embodiments.

[0097] The above are exemplary embodiments disclosed by the present invention. The order of disclosure of the above embodiments of the present invention is only for description and does not represent the superiority or inferiority of the embodiments. However, it should be noted that the discussion of any of the above embodiments is only exemplary and is not intended to imply that the scope of disclosure of the embodiments of the present invention (including the claims) is limited to these examples. Without departing from the scope defined by the claims, various changes and modifications can be made. The functions, steps, or actions of the method claims according to the disclosed embodiments here do not need to be executed in any specific order. In addition, although the elements disclosed in the embodiments of the present invention can be described or claimed in individual form, they can also be understood as multiple unless explicitly limited to the singular.

[0098] 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 of disclosure of the embodiments of the present invention (including the claims) is limited to these examples; under the idea of the embodiments of the present invention, the technical features between 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 omissions, modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the embodiments of the present invention should be included in the protection scope of the embodiments of the present invention.

[0099] The above has described in detail one embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered as limiting the scope of implementation of the present invention. Any equivalent changes and improvements made within the scope of the application of the present invention should still fall within the scope covered by the patent of the present invention.

Claims

1. A method for recovering titanium from vanadium-titanium magnetite tailings, characterized in that, It includes the following steps: Step 1: Conduct particle size classification using a high-frequency vibrating screen to obtain products of different particle sizes; perform tabling concentration on products of different particle sizes and all particle sizes to preliminarily separate heavy mineral components; Step 2: Successively separate magnetic minerals according to the magnetic strength of the minerals and discard non-magnetic minerals; Determine the optimal magnetic field strength, perform tabling concentration on the heavy minerals of the selected particle size, and conduct high-intensity magnetic separation to remove impurities from the obtained concentrate; Step 3: Conduct desulfurization flotation on the magnetic separation concentrate, add lime to adjust the pH value of the pulp to 9, then successively add a collector and a frother, and after roughing and scavenging, obtain sulfide ore; Then conduct titanium flotation and collection on the tailings after desulfurization flotation, control the roughing concentration, the fineness of the feed for flotation, and the cleaning concentration, and perform titanium flotation with one roughing and five cleanings; Step 4: Conduct weak magnetic separation on the obtained concentrate after separation to remove iron and obtain titanium concentrate.

2. The method for recovering titanium from vanadium-titanium magnetite tailings according to claim 1, characterized in that, In the said Step 1, conduct tabling concentration experiments on products of different particle sizes and all particle sizes using a 6-S table; among them, the roughing feed concentration is 25%, and the cleaning feed concentration is 30%.

3. A method for recovering titanium from vanadium-titanium magnetite tailings according to claim 1, characterized in that, The method of successively separating magnetic minerals and discarding non-magnetic minerals in the said Step 2 is: separate magnetite minerals from other minerals through weak magnetism, and then conduct high-intensity magnetic separation to pre-separate non-magnetic minerals for realizing titanium enrichment.

4. The method for recovering titanium from vanadium-titanium magnetite tailings according to claim 3, characterized in that, The weak magnetism in the said Step 2 uses a magnetic field strength of 1300 GS; High-intensity magnetic separation respectively uses three high-intensity magnetic combinations of magnetic separation field strengths of 13000 + 10000 GS, 10000 + 8000 GS, and 8000 + 6000 GS to conduct separation on high-intensity magnetic pre-enriched titanium.

5. A method for recovering titanium from vanadium-titanium magnetite tailings according to claim 4, characterized in that, In the said Step 2, select a particle size less than 0.3 mm for tabling concentration, and conduct high-intensity magnetic separation experiments on the obtained concentrate.

6. A method for recovering titanium from vanadium-titanium magnetite tailings according to claim 5, characterized in that, In the said Step 2, select a magnetic field strength of 6000 GS, and the TiO2 grade in the obtained high-intensity magnetic concentrate is 2.82%.

7. A method for recovering titanium from vanadium-titanium magnetite tailings according to claim 1, characterized in that, In the said Step 3, conduct desulfurization flotation on the magnetic separation concentrate using an XFDI I single-cell flotation device; the collector is selected as isoamyl xanthate, and its total dosage is 100 g / t; the frother is selected as No. 2 oil, and its total dosage is 30 g / t.

8. A method for recovering titanium from vanadium-titanium magnetite tailings according to claim 7, characterized in that, In the said Step 3, conduct titanium flotation on the tailings after desulfurization flotation, specifically: add sulfuric acid to adjust the pH value of the pulp to 5 - 5.5, and use a titanium collector to selectively collect minerals containing TiO2 and other oxidized minerals.

9. A method for recovering titanium from vanadium-titanium magnetite tailings according to claim 8, characterized in that, In the said Step 3, the titanium collector is selected as 8008# titanium collector, and its total dosage is 4000 g / t.

10. A method for recovering titanium from vanadium-titanium magnetite tailings according to claim 9, characterized in that, In the said Step 3, control the roughing concentration at 50%, the cleaning concentration at 40 - 45%, and the fineness of the feed for flotation at 30 - 35%.

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