Process for recovering ilmenite from vanadium titano-magnetite whole-process tailings

Abstract

The invention discloses a process for recovering ilmenite from vanadium titano-magnetite full-process tailings, which comprises the following steps: by taking the vanadium titano-magnetite full-process tailings as raw materials, carrying out strong magnetic tailing discarding operation, inclined plate concentration and flotation desulfurization operation and titanium flotation operation to obtain titanium concentrate and final tailings. According to the process provided by the invention, the ilmenite with the ultrafine particle size of-18 microns in the vanadium titano-magnetite whole-process tailings can be effectively recovered, and meanwhile, the process also has a relatively good recovery effect on the ilmenite with the particle size of-10 microns. According to the method provided by the invention, the recycling of the ultra-fine particle grade ilmenite in the vanadium titano-magnetite whole-process tailings can be realized.

Description

Technical Field

[0001] The present invention relates to the technical field of mineral processing, and in particular to a process for recovering ilmenite from tailings of a vanadium-titanium magnetite ore in the entire process. Background Art

[0002] my country is rich in titanium resources, but they are primarily concentrated in vanadium-titanium magnetite, a polymetallic mineral composed primarily of iron, titanium, and vanadium. Its average titanium grade is less than 10%. A process has been established for vanadium-titanium magnetite, where iron is first separated followed by titanium separation. Low-intensity magnetic separation is used to obtain a 55% iron concentrate, followed by a combined high-intensity magnetic separation and flotation process to produce a 45.5% titanium concentrate. Existing process mineralogy studies have shown that the theoretical iron recovery rate for Panxi vanadium-titanium magnetite ore is approximately 63%, and the theoretical titanium recovery rate is approximately 64%. Currently, the overall titanium recovery rate is significantly lower than the theoretical recovery rate. The TiO2 recovery rate for iron tailings has reached approximately 45%, and the TiO2 grade in the tailings is less than 6%. As the mineral content of vanadium-titanium magnetite mining becomes increasingly finer, the production of a high volume of overground ilmenite during the beneficiation process to obtain a qualified iron concentrate is directly discharged into the tailings pond as tailings, contributing to the significant discrepancy between titanium recovery and theoretical grade. If this part of ilmenite can be effectively recovered, ilmenite recovery will reach a new level and the titanium recovery rate will increase by 5-7%.

[0003] To recover ilmenite from the tailings of the vanadium-titanium magnetite process, numerous researchers have conducted research on gravity separation, electrostatic separation, magnetic separation, flotation, and a combination of these methods. These efforts have achieved good results within certain limits. However, the recovery of overground ilmenite from the tailings of the vanadium-titanium magnetite process has been less effective.

[0004] Li Cheng et al. studied the use of column machine combined with flotation to directly recover ilmenite from iron ore tailings. The main technical indicators are to grind the iron ore tailings to -0.074mm, accounting for 65%, and then carry out desulfurization flotation. The desulfurization flotation tailings are ground to -0.074mm, accounting for 85%, and then carry out flotation column rough selection of titanium. The rough selected concentrate is fed into the flotation machine for five rounds of selection. The titanium concentrate TiO2 grade is 42.05%, and the titanium recovery rate is 66.62%. The ilmenite grade of this method is too low to be used directly, and further quality improvement and impurity reduction are required to meet the standards of titanium concentrate. Wang Xianyun conducted a feasibility study on the recovery of ilmenite from the total tailings titanium resources. He carried out a coarse and fine strong magnetic separation of titanium from the total tailings of vanadium-titanium magnetite with a TiO2 grade of 5.97%, and obtained ilmenite with a TiO2 grade of 16.18%. The yield of ilmenite to the total tailings was 10.56%, and the TiO2 recovery rate was 28.62%. This method can effectively recover some ilmenite in the total tailings, but the recovered ilmenite does not meet the standards of titanium concentrate, and the recovery rate is only about 30%. Wu Xuehong conducted a test study on the recovery of titanium from titanium tailings. The titanium tailings were first subjected to weak magnetic iron removal, and the tailings after iron removal were subjected to a strong magnetic recovery of ilmenite. The first-stage high-strength magnetic concentrate is graded. Concentrates with a particle size greater than 0.154mm are ground and then subjected to a second-stage iron scavenging process. Concentrates with a particle size less than 0.154mm undergo ultrasonic de-doping. The tailings from the second-stage iron scavenging process and the ultrasonically de-doped ore are then combined in a second-stage high-strength magnetic process. The second-stage high-strength magnetic concentrate undergoes desulfurization and titanium flotation in a three-step process of coarsening, scavenging, and refining, ultimately yielding a titanium concentrate with a TiO2 grade of 47.06% and a TiO2 recovery rate of 36.74%. Patent application CN112221702A discloses a method for recovering fine-grained titanium concentrate from the total tailings of vanadium-titanium magnetite. The main technical indicators are the use of a drum screen for impurity treatment, the separation of non-target minerals entering the mill through a cyclone group, and then the use of a "screening-ball milling-screening" method to pre-discard the undissociated minerals entering the ball mill and the non-magnetic gangue minerals in most of the dissociated materials after the ball mill discharge. At the same time, with the use of a two-stage strong magnetic + screening system, the valuable materials in this pre-discarded material are recovered again. Finally, a titanium concentrate with a TiO2 grade of about 46% is obtained through a spiral chute, arc-shaped spreading film separation and rotary vibration separation process. This method can recover some ilmenite from vanadium-titanium magnetite tailings, but it cannot effectively recover the over-ground ilmenite in the tailings, so the recovery rate of this method is relatively low.

[0005] In view of the problem that ilmenite is not effectively recovered in the tailings of the whole process of vanadium-titanium magnetite, it is very urgent and important to find a process for recovering ilmenite in the tailings of the whole process of vanadium-titanium magnetite. Summary of the Invention

[0006] The purpose of the present invention is to overcome the defects of the above-mentioned prior art and provide a process for recovering ilmenite from vanadium-titanium magnetite tailings in the whole process.

[0007] The present invention solves the technical problem by adopting the following technical solutions.

[0008] The present invention provides a process for recovering ilmenite from the full-process tailings of vanadium-titanium magnetite, which comprises: using the full-process tailings of vanadium-titanium magnetite as raw materials, and obtaining titanium concentrate and final tailings through strong magnetic tailings discarding operation, inclined plate concentration and flotation desulfurization operation, and titanium flotation operation.

[0009] The present invention has the following beneficial effects:

[0010] The present invention provides a process for recovering ilmenite from the tailings of a vanadium-titanium magnetite full-process, which comprises: using the tailings of the vanadium-titanium magnetite full-process as raw material, and obtaining ilmenite concentrate and final tailings through a strong magnetic tailings discarding operation, an inclined plate concentration and flotation desulfurization operation, and a titanium flotation operation. The above process first removes the fine mud and gangue that affect the titanium flotation operation in the tailings of the vanadium-titanium magnetite full-process through a strong magnetic tailings discarding operation, and then concentrates and removes sulfide minerals through an inclined plate concentration and flotation desulfurization operation, and then performs a titanium flotation operation, which can effectively float out the ilmenite concentrate. The above process can realize the recovery of ultrafine-grained ilmenite in the tailings of the vanadium-titanium magnetite full-process, and can improve the comprehensive recovery rate of ilmenite. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0012] Figure 1 This is a process flow chart for recovering ilmenite from tailings of vanadium-titanium magnetite in the entire process of the present invention. DETAILED DESCRIPTION

[0013] To make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are described clearly and completely below. Where specific conditions are not specified in the embodiments, conventional conditions or conditions recommended by the manufacturer are used. Where the manufacturer of the reagents or instruments is not specified, all are conventional products that can be purchased commercially.

[0014] Aiming at the problem that part of the ilmenite in the tailings of the whole process of vanadium-titanium magnetite cannot be effectively recovered and the titanium recovery rate is low, the present invention provides a process for recovering the ilmenite in the tailings of the whole process of vanadium-titanium magnetite.

[0015] The following is a detailed description of a process for recovering ilmenite from vanadium-titanium magnetite tailings provided in an embodiment of the present invention.

[0016] An embodiment of the present invention provides a process for recovering ilmenite from the full-process tailings of vanadium-titanium magnetite, which comprises: using the full-process tailings of vanadium-titanium magnetite as raw materials, and obtaining titanium concentrate and final tailings through strong magnetic tailings discarding operation, inclined plate concentration and flotation desulfurization operation, and titanium flotation operation.

[0017] The embodiment of the present invention provides a process for recovering ilmenite from the tailings of a full-process vanadium-titanium magnetite mine. Based on the beneficiation principle of discarding as early as possible, a strong magnetic tailing discarding operation is carried out in advance to remove the fine mud and gangue that affect the titanium flotation operation in the tailings of the full-process vanadium-titanium magnetite mine. Most of the tailings are discarded by the strong magnetic operation to obtain a strong magnetic concentrate. This step can reduce the processing volume of the titanium flotation operation and reduce the reagent consumption of the titanium flotation operation; then, inclined plate concentration and flotation desulfurization are carried out. This step removes sulfide minerals in the strong magnetic concentrate after concentration, further improving the purity of the flotation ore; then, a titanium flotation operation is carried out. This step can quickly and effectively float out the titanium concentrate from the flotation ore, and finally realize the recovery of ultra-fine-grained ilmenite in the tailings of the full-process vanadium-titanium magnetite mine. This solves the problem that the ilmenite in the tailings of the full-process vanadium-titanium magnetite mine, especially some over-ground ilmenite, cannot be effectively recovered, and the titanium recovery rate is low.

[0018] In an optional embodiment, the composition of the full-process tailings of vanadium-titanium magnetite includes: iron ore upgrading tailings, strong magnetic tailings and inclined plate overflow, and the TiO2 grade of the full-process tailings is less than 6%, the proportion of minerals with a particle size of -18μm is greater than 70%, and the proportion of minerals with a particle size of -10μm is greater than 40%.

[0019] It is worth noting that the iron ore upgrading tailings are the tailings produced by the regrinding and re-selection of iron ore, the strong magnetic tailings are the tailings produced by the vanadium-titanium magnetite after the beneficiation process of first selecting iron and then strong magnetic separation of titanium, and the inclined plate overflow is the overflow generated by the ilmenite entering the floating concentration inclined plate.

[0020] At present, the recovery of ilmenite from vanadium-titanium magnetite tailings mainly faces the following problems: (1) Low tailings grade: After the vanadium-titanium magnetite goes through the beneficiation process of first selecting iron and then selecting titanium, most of the ilmenite is recovered, and the ilmenite content in the vanadium-titanium magnetite tailings is low; (2) The ilmenite in the tailings is fine particle size: Since the ilmenite in the tailings of the whole process of vanadium-titanium magnetite is mostly over-ground, its particle size is mostly less than 18μm, it has the characteristics of large specific surface area, large surface energy, small mass, strong reagent adsorption capacity, and poor reagent selectivity. As a result, under the existing flotation process conditions, there are problems such as large flotation reagent consumption and easy entrainment by water flow machinery.

[0021] The embodiment of the present invention provides a process for recovering ilmenite from the tailings of a vanadium-titanium magnetite full-process. The tailings of the vanadium-titanium magnetite full-process are used as raw materials. The particle size of the ilmenite in the raw materials is mostly less than 18 μm. The cost of direct flotation is high and the efficiency is low. However, if it is not recovered, it will cause a waste of resources. The inventor has proposed a recovery process through practice. First, the tailings of the vanadium-titanium magnetite full-process are subjected to a tailings disposal operation to discard a large amount of fine mud and gangue that affect the flotation operation. Then, concentration and desulfurization are carried out, and sulfide minerals are further concentrated and removed. Finally, flotation operations are carried out. Through the above-mentioned recovery process, the ultrafine particle size of -18 μm ilmenite in the tailings of the vanadium-titanium magnetite full-process can be effectively recovered, and the ilmenite of -10 μm can also be recovered with good results, thereby realizing the effective recovery and utilization of the tailings of the vanadium-titanium magnetite full-process, especially the over-ground ilmenite.

[0022] In an optional embodiment, the strong magnetic tailings discarding operation includes: after classifying the tailings from the full process of the vanadium-titanium magnetite ore, performing a roughing separation and at least one cleaning separation, and discarding more than 75% of the tailings through a strong magnetic operation to obtain a strong magnetic concentrate. By discarding more than 75% of the tailings from the full process of the vanadium-titanium magnetite ore through the strong magnetic tailings discarding operation, i.e., a tailings discarding rate greater than 75%, the flotation process throughput is reduced, the consumption of flotation reagents is reduced, the flotation separation efficiency is improved, and the flotation process flow is simplified.

[0023] In an optional embodiment, a high-gradient strong magnetic machine is used for strong magnetic tailings removal; the process conditions for strong magnetic tailings removal include: a pulp concentration of 10% to 20%, a rod medium of 0.8mm to 1.2mm, a stroke rate of 250 to 350 times / min, a stroke of 35mm, a roughing magnetic field strength of 0.5T to 1.8T, and a fine selection magnetic field strength of not less than 0.5T. The high-gradient strong magnetic machine has a strong adaptability to fluctuations in the particle size, concentration, and grade of the feed ore. At the same time, the high-gradient magnetic field can be adjusted according to the properties of the material, thereby improving the adaptability of the equipment and having a relatively higher separation efficiency for weakly magnetic minerals. This design enables the high-gradient strong magnetic machine to effectively separate magnetic materials from minerals when processing small and fine-grained ore materials, thereby improving operating efficiency.

[0024] In an optional embodiment, the strong magnetic concentrate is concentrated by an inclined plate to a pulp concentration of 20-25%, followed by flotation desulfurization to produce desulfurized tailings. The strong magnetic concentrate is concentrated by an inclined plate to a pulp concentration of 20-25%, followed by flotation desulfurization. Flotation desulfurization can use a highly efficient and environmentally friendly collector to effectively remove sulfide minerals, facilitating the subsequent titanium flotation operation.

[0025] In an optional embodiment, the titanium flotation process is a process of first roughing, second sweeping, and fourth fine processing. The finely selected middlings are sequentially returned to the previous process, and the scavenged foam is sequentially returned to the previous process. The above operation can improve the recovery rate and yield of titanium concentrate.

[0026] In an optional embodiment, the roughing and scavenging of titanium flotation operations use a non-powered nano-microbubble countercurrent contact flotation machine, and the fine selection uses a mechanical stirring flotation machine.

[0027] The embodiment of the present invention provides a process for recovering ilmenite from the tailings of vanadium-titanium magnetite in the entire process. The process of titanium flotation operation is one roughing, two scavenging and four finishing, and the roughing and scavenging of the titanium flotation operation adopt an unpowered nano-micro bubble countercurrent contact flotation machine, and the finishing adopts a mechanical stirring flotation machine. The above-mentioned unpowered nano-micro bubble countercurrent contact flotation machine is used in combination with a mechanical stirring flotation machine for flotation, which simplifies the flotation process and obtains high-quality and high-recovery titanium concentrate products. The unpowered nano-micro bubble countercurrent contact flotation machine can stably generate nano bubbles, which increases the probability of collision and adhesion between bubbles and mineral particles. The bubbles and mineral particles move in the opposite direction during the flotation process, playing the role of "secondary capture", enhancing the mineralization of fine mineral particles, and can effectively reduce the ilmenite content in the flotation tailings, improve flotation efficiency, and reduce the number of flotation operations. Therefore, the unpowered nano-micro bubble countercurrent contact flotation machine is used for roughing and scavenging. The use of a non-powered nano-microbubble countercurrent contact flotation cell in the concentrating process, however, results in excessive nanobubbles, which cause fine gangue minerals to float up along with the bubbles, making it difficult to obtain a qualified titanium concentrate. These cells lack a foam scraper. Once the concentrate reaches a certain thickness through the foam layer, it flows out of the overflow weir. This results in a large amount of mineralized foam accumulating at the top of the flotation column, which cannot be promptly discharged. This causes ilmenite to accumulate in the column, reducing flotation efficiency. A mechanically agitated continuous flotation cell generates turbulent flow during the flotation process, causing some mineral particles to break free from the bubbles, thus achieving a "concentrating" effect and reducing the inclusion of gangue minerals in the foam product with the ilmenite. Mechanically agitated flotation cells feature a foam scraper on the top of the flotation cell, enabling the timely removal of concentrate foam and effectively improving concentrating efficiency. Therefore, using a mechanically agitated flotation cell for concentrating operations effectively improves flotation efficiency and ensures the TiO2 grade of the titanium concentrate.

[0028] In an optional embodiment, the flotation concentration of the desulfurized tailings is 18% to 25%, the unit consumption of the flotation depressant EM-A is 300g / t to 900g / t, the unit consumption of the collector EM-326 is 8000g / t to 16000g / t, the unit consumption of the pH adjuster sulfuric acid is 5000g / t to 13000g / t, and the unit consumption of the auxiliary collector diesel is 1000g / t to 2500g / t.

[0029] In an optional embodiment, the flotation operation yield is greater than 30% and the recovery rate is greater than 80%.

[0030] In an optional embodiment, the titanium concentrate has a TiO2 grade greater than 45.5%, the proportion of minerals with a particle size of -18 μm in the titanium concentrate is greater than 80%, the titanium distribution rate is greater than 80%, and the proportion of minerals with a particle size of -10 μm is greater than 40%, and the titanium distribution rate is greater than 50%. The present invention can effectively recover ultrafine ilmenite with a particle size of -18 μm from the tailings of the vanadium-titanium magnetite process, and also has a good recovery effect on ilmenite with a particle size of -10 μm, thus having good application value and economic value.

[0031] The present invention will be further described below with reference to the embodiments.

[0032] Example 1

[0033] A process for recovering ilmenite from tailings of vanadium-titanium magnetite, the process flow is as follows: Figure 1 As shown, the raw material to be selected is a full-process tailings in Panzhihua area, with a TiO2 content of only 5.52%, a mineral content of -18μm particle size of 71.26%, a distribution rate of 82.54%, and a mineral content of -10μm particle size of 42.18%, a distribution rate of 51.32%. The specific steps are as follows:

[0034] Step 1: The tailings from the vanadium-titanium magnetite ore are subjected to a high-strength magnetic tailings discarding process (roughing and finishing). 78.95% of the tailings are discarded to obtain a high-strength magnetic concentrate. The high-strength magnetic process concentration is 18.29%, the rod medium is 1.0mm, the stroke rate is 300 strokes / min, the stroke length is 35mm, the roughing magnetic field strength is 1.2T, the finishing magnetic field strength is 0.9T for finishing 1, and the finishing magnetic field strength is 0.8T for finishing 2.

[0035] Step 2: The strong magnetic concentrate is subjected to inclined plate concentration followed by titanium flotation, followed by inclined plate concentration, flotation desulfurization, and a four-stage roughing, two-stage scavenging, and four-stage finishing process. Inclined plate concentration increases the slurry concentration of the strong magnetic concentrate from 11.31% to 23.68%. Desulfurization is then performed to produce desulfurized tailings, which are then subjected to titanium flotation roughing. The desulfurized tailings enter the flotation process with a concentration of 23.68%. Titanium flotation roughing and scavenging are performed using a non-powered nano-microbubble countercurrent contact flotation cell, while finishing is performed using a mechanical agitation flotation cell.

[0036] In this embodiment, a titanium flotation process consisting of strong magnetic tailings discarding, inclined plate concentration, flotation desulfurization, and a one-roughing, two-sweeping, and four-fining process was used to obtain a titanium concentrate with a TiO2 grade of 47.53% from vanadium-titanium magnetite tailings with a TiO2 grade of 5.52%. This process achieved a flotation yield of 37.13% and a recovery rate of 83.01%. The titanium concentrate had a -18μm content of 81.26% and a titanium distribution rate of 82.31%, and a -10μm content of 46.38% and a titanium distribution rate of 53.28%.

[0037] Example 2

[0038] A process for recovering ilmenite from tailings of vanadium-titanium magnetite, the process flow is as follows: Figure 1 As shown, the raw material to be selected is TiO2 with a grade of 4.82%, a mineral content of -18μm particle size of 75.21%, a distribution rate of 83.22%, a mineral content of -10μm particle size of 41.35%, and a distribution rate of 46.27%. The specific steps are the same as those in Example 1.

[0039] In this embodiment, a titanium flotation process consisting of strong magnetic tailings discarding, inclined plate concentration, flotation desulfurization, and a one-roughing, two-sweeping, and four-fining process was used to obtain a titanium concentrate with a TiO2 grade of 46.59% from vanadium-titanium magnetite tailings with a TiO2 grade of 4.82%. The flotation yield was 34.27% and the recovery rate was 81.27%. The titanium concentrate had a -18μm content of 83.17% and a titanium distribution rate of 83.78%, and a -10μm content of 43.68% and a titanium distribution rate of 51.01%.

[0040] Example 3

[0041] A process for recovering ilmenite from tailings of vanadium-titanium magnetite, the process flow is as follows: Figure 1 As shown, the raw material to be selected is TiO2 with a grade of 5.83%, a mineral content of -18μm particle size of 74.18%, a distribution rate of 81.06%, a mineral content of -10μm particle size of 42.59%, and a distribution rate of 47.37%. The specific steps are the same as those in Example 1.

[0042] In this embodiment, a titanium flotation process consisting of strong magnetic tailings discarding, inclined plate concentration, flotation desulfurization, and a one-roughing, two-sweeping, and four-fining process was used to obtain a titanium concentrate with a TiO2 grade of 47.23% from vanadium-titanium magnetite tailings with a TiO2 grade of 5.83%. The flotation yield was 38.35% and the recovery rate was 82.73%. The titanium concentrate had a -18μm content of 82.71% and a titanium distribution rate of 81.96%, and a -10μm content of 42.33% and a titanium distribution rate of 51.23%.

[0043] Comparative Example 1

[0044] The steps are similar to those in Example 1, except that the strong magnetic tailings discarding operation is not performed, and the titanium flotation operation is directly performed. The final titanium concentrate TiO2 grade is 38.63%, and the flotation operation recovery rate is 47.38%.

[0045] The main reason is that the tailings samples of the whole process of vanadium-titanium magnetite contain a large amount of gangue and fine mud, which causes a poor flotation environment, resulting in a large consumption of reagents in the flotation operation, difficulty in obtaining qualified products and low recovery rate.

[0046] Comparative Example 2

[0047] Similar to Example 1, except that a flotation machine is used in the flotation process, the final titanium concentrate TiO2 grade is 46.32%, and the flotation operation recovery rate is 71.28%.

[0048] The main reason is that flotation machines are used in roughing and scavenging, which results in fine-grained ilmenite being discharged into the tailings without being recovered by flotation foam, resulting in a low flotation recovery rate.

[0049] Comparative Example 3

[0050] Similar to Example 1, except that: the titanium flotation operation adopts an unpowered nano-microbubble countercurrent contact flotation machine, the final titanium concentrate TiO2 grade is 43.26%, and the flotation operation recovery rate is 85.28%.

[0051] The main reason is that the titanium flotation operation selection process uses a non-powered nano-microbubble countercurrent contact flotation machine, which causes the fine-grained gangue minerals to easily float up with the bubbles, and the fine-grained gangue minerals are not easily suppressed, resulting in a lower concentrate grade.

[0052] Comparative Example 4

[0053] Similar to Example 1, except that the strong magnetic concentrate was directly subjected to desulfurization flotation without concentration, and the final titanium concentrate TiO2 grade was 47.52%, and the flotation recovery rate was 71.06%.

[0054] The main reason is that the flotation is directly carried out without concentration, and the flotation concentration is too low, which will lead to low flotation recovery rate.

[0055] Comparative Example 5

[0056] Similar to Example 1, the difference is that the titanium flotation operation adopts a flotation process of one coarse and four fine, and the titanium concentrate TiO2 grade is 46.27%, and the flotation operation recovery rate is 71.13%.

[0057] The main reason is that it is difficult to recover ilmenite in the slurry through only one roughing operation, resulting in a higher TiO2 grade in the flotation tailings and a lower recovery rate of the flotation operation.

[0058] Comparative Example 6

[0059] Similar to Example 1, except that: a mechanical stirring flotation machine is used for roughing and scavenging of titanium flotation operation, and a non-powered nano-microbubble countercurrent contact flotation machine is used for concentrating. The titanium concentrate TiO2 grade is 46.27%, and the flotation recovery rate is 62.17%.

[0060] The main reason is that the roughing and scavenging processes use a mechanical stirring flotation machine, and its separation efficiency in the roughing and scavenging processes is lower than that of the unpowered nano-microbubble countercurrent contact flotation machine, resulting in a low flotation recovery rate.

[0061] Comparative Example 7

[0062] Similar to Example 1, except that: the floating sulfur tailings are subjected to titanium separation operation using a shaking table, and the titanium concentrate obtained has a TiO2 grade of 39.18% and a titanium separation recovery rate of 43.67%.

[0063] The main reason is that the lower limit of the force of a general shaking table for mineral processing is 0.074mm, which makes it difficult to effectively recover the ilmenite in the tailings of the entire process, resulting in a low grade and recovery rate of the titanium concentrate.

[0064] Comparative Example 8

[0065] Similar to Example 1, except that the floating sulfur tailings are subjected to titanium separation using a spiral chute, and the titanium concentrate obtained has a TiO2 grade of 35.18% and a titanium separation recovery rate of 39.67%.

[0066] The main reason is that it is difficult for the spiral chute to effectively recover ilmenite in the tailings of the entire process, resulting in low grade of titanium concentrate and low recovery rate.

[0067] From the above results, it can be seen that the process for recovering ilmenite from tailings of vanadium-titanium magnetite provided by the embodiment of the present invention has the following characteristics and advantages:

[0068] (1) Simple process flow: Through strong magnetic tailing, the tailing rate is greater than 75%, which reduces the processing capacity of flotation operation, reduces the consumption of flotation reagents, improves the flotation separation efficiency, and shortens the flotation process flow;

[0069] (2) High recovery rate: The present invention adopts a non-powered nano-microbubble countercurrent contact flotation machine + a mechanical stirring flotation machine to carry out titanium flotation operations. Compared with the flotation machine, the flotation operation recovery rate is increased by 5% to 20% when the quality of the concentrate is not much different.

[0070] (3) Good concentrate quality: The present invention provides a process for recovering ilmenite from tailings of vanadium-titanium magnetite in the entire process. The obtained flotation concentrate product has a grade greater than 45.5%. Compared with flotation using flotation columns, the TiO2 grade of the concentrate is 3%-6% higher.

[0071] As can be seen from the above, the present invention provides a process for recovering ilmenite from the tailings of a full-process vanadium-titanium magnetite mine. The process utilizes a non-powered nano-microbubble countercurrent contact flotation machine and a mechanical agitation flotation machine to perform titanium flotation operations, fully combining the flotation advantages of both devices. Compared with existing methods for recovering ilmenite from the tailings of a full-process vanadium-titanium magnetite mine, the present invention can effectively recover ultrafine-grained ilmenite of -18μm in the tailings, and also has a good recovery effect on ilmenite of -10μm. The present invention achieves a concentrate product with a -18μm content greater than 80% and a titanium distribution rate greater than 80%, achieving the recovery of ultrafine-grained ilmenite from the tailings of a full-process vanadium-titanium magnetite mine and improving the overall recovery rate of ilmenite. Compared with a flotation machine, the flotation recovery rate is increased by 5% to 20% when the concentrate quality is similar. Compared with a flotation column, the grade and recovery rate of the concentrate from the flotation operation are both significantly improved.

[0072] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A process for recovering ilmenite from tailings of vanadium-titanium magnetite in the whole process, characterized in that: It includes: The whole process tailings of vanadium-titanium magnetite are used as raw materials, and titanium concentrate and final tailings are obtained through strong magnetic tailings discarding operation, inclined plate concentration and flotation desulfurization operation, and titanium flotation operation.

2. The process for recovering ilmenite from tailings of vanadium-titanium magnetite according to claim 1, characterized in that: The composition of the full-process tailings of the vanadium-titanium magnetite includes: iron ore concentrate upgrading tailings, strong magnetic tailings and inclined plate overflow. The TiO2 grade of the full-process tailings is less than 6%, the proportion of minerals with a particle size of -18μm is greater than 70%, and the proportion of minerals with a particle size of -10μm is greater than 40%.

3. The process for recovering ilmenite from tailings of vanadium-titanium magnetite according to claim 1, characterized in that: The strong magnetic tailings discarding operation includes: after classifying the tailings of the whole process of the vanadium-titanium magnetite, a roughing selection and at least one concentrating strong magnetic operation are performed to discard more than 75% of the tailings to obtain a strong magnetic concentrate.

4. The process for recovering ilmenite from tailings of vanadium-titanium magnetite according to claim 3, characterized in that: A high-gradient strong magnetic machine is used for strong magnetic tailings discarding; the process conditions of strong magnetic tailings discarding include: slurry concentration of 10% to 20%, rod medium of 0.8mm to 1.2mm, stroke frequency of 250 to 350 times / min, stroke of 35mm, roughing magnetic field intensity of 0.5T to 1.8T, and fine selection magnetic field intensity of not less than 0.5T.

5. The process for recovering ilmenite from tailings of vanadium-titanium magnetite according to claim 1, characterized in that: The inclined plate concentration and flotation desulfurization operation includes: performing inclined plate concentration on the strong magnetic concentrate to make the pulp concentration reach 20-25%, and then performing flotation desulfurization to obtain desulfurized tailings.

6. The process for recovering ilmenite from tailings of vanadium-titanium magnetite according to claim 1, characterized in that: The process of titanium flotation operation is one roughing, two sweeping and four fine processing. The selected medium ore is returned to the previous operation in sequence, and the swept foam is returned to the previous operation in sequence.

7. The process for recovering ilmenite from tailings of vanadium-titanium magnetite according to claim 6, characterized in that: The roughing and scavenging of titanium flotation operations use unpowered nano-microbubble countercurrent contact flotation machines, while the fine selection uses mechanical stirring flotation machines.

8. The process for recovering ilmenite from tailings of vanadium-titanium magnetite according to claim 7, characterized in that: The flotation concentration of the desulfurized tailings obtained by the flotation desulfurization operation is 18% to 25%, the unit consumption of the flotation depressant EM-A is 300g / t to 900g / t, the unit consumption of the collector EM-326 is 8000g / t to 16000g / t, the unit consumption of the pH adjuster sulfuric acid is 5000g / t to 13000g / t, and the unit consumption of the auxiliary collector diesel is 1000g / t to 2500g / t.

9. The process for recovering ilmenite from tailings of vanadium-titanium magnetite according to claim 8, characterized in that: The flotation operation yield is greater than 30%, and the recovery rate is greater than 80%.

10. The process for recovering ilmenite from tailings of vanadium-titanium magnetite according to claim 9, characterized in that: The TiO2 grade of the titanium concentrate is greater than 45.5%, the proportion of minerals in the -18 μm particle size in the titanium concentrate is greater than 80%, and the titanium distribution rate is greater than 80%, the proportion of minerals in the -10 μm particle size is greater than 40%, and the titanium distribution rate is greater than 50%.

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