A method for recovering titanium concentrate from titanium tailings from vanadium-titanium magnetite

Abstract

The present invention discloses a method for recovering titanium concentrate from vanadium-titanium magnetite titanium tailings. The method comprises: grinding the vanadium-titanium magnetite titanium tailings, mixing them with water to form a slurry, adjusting the pH value to acidic, and then reacting with a reagent 1 to obtain a primary treatment slurry, wherein the reagent 1 can complex with silicon to form a first complex; removing the first complex from the primary treatment slurry to obtain a first filter cake; grinding the first filter cake, mixing it with water to form a slurry, magnetically separating the obtained slurry to obtain a magnetic separation slurry and a magnetic residue slurry, filtering the magnetic separation slurry to obtain a magnetic separation concentrate; adjusting the pH value of the magnetic residue slurry to alkaline, and then reacting with a reagent 2 to obtain a secondary treatment slurry, wherein the reagent 2 can complex with calcium, aluminum, and magnesium to form a second complex; removing the second complex from the secondary treatment slurry to obtain a second filter cake, and combining the second filter cake with the magnetic separation concentrate and drying to obtain titanium concentrate. Thus, the method can improve the recovery rate of titanium concentrate.

Description

Technical Field

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

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

[0003] Vanadium-titanium magnetite, as a type of iron ore and the main source of titanium, is widely distributed. The main useful metals of this type of ore are iron, titanium and vanadium, but vanadium generally exists in the form of vanadium-iron spinel, which can only be obtained through smelting. Therefore, the useful minerals that can be obtained through mineral processing are iron and titanium. However, the low-grade vanadium-titanium magnetite tailings formed after mineral processing cannot meet the production requirements of the titanium industry. Therefore, large-scale stockpiling can easily cause waste of titanium resources and bring possible environmental pollution.

[0004] The existing technology for recovering titanium from vanadium-titanium magnetite titanium tailings mainly relies on a combination of two or more methods, such as weak magnetic separation, strong magnetic separation, gravity separation, flotation, electrostatic separation, and ball mill classification. However, the recovery rate of titanium concentrate using the existing technology is mostly below 50%, and the recovery rate of titanium concentrate is low. Summary of the Invention

[0005] The present invention aims to solve, at least to some extent, one of the technical problems in the related art. To this end, the present invention provides a method for recovering titanium concentrate from titanium tailings obtained from vanadium-titanium magnetite. The method provided by the present invention can produce qualified titanium concentrate and improve the recovery rate of the titanium concentrate.

[0006] To this end, the present invention proposes a method for recovering titanium concentrate from titanium tailings of vanadium-titanium magnetite. According to an embodiment of the present invention, the method comprises:

[0007] The vanadium-titanium magnetite titanium tailings are ground and mixed with water to form a slurry, and after adjusting the pH value to acidic, mixed with reagent 1 to react to obtain a primary treatment slurry, wherein the reagent 1 can complex with silicon to form a first complex;

[0008] removing the first complex from the primary treatment slurry to obtain a first filter cake;

[0009] Grinding the first filter cake and mixing it with water to form a slurry, magnetically separating the obtained slurry to obtain a magnetic separation slurry and a magnetic residual slurry, and filtering the magnetic separation slurry to obtain a magnetic separation concentrate;

[0010] After adjusting the pH value of the magnetic slurry to alkaline, the slurry is mixed with the reagent 2 to react to obtain a secondary treatment slurry, wherein the reagent 2 can be complexed with calcium, aluminum and magnesium to form a second complex;

[0011] The second complex is removed from the secondary treatment slurry to obtain a second filter cake, and the second filter cake is combined with the magnetic separation concentrate and dried to obtain titanium concentrate.

[0012] According to the method for recovering titanium concentrate from vanadium-titanium magnetite titanium tailings according to the embodiment of the present invention, first, physical grinding is performed to preliminarily separate titanium-containing minerals from mineral impurities, and then, under acidic conditions, a reagent 1 containing a silicon complexing agent is used to selectively react with silicon impurities to form a complex, thereby promoting the chemical separation of titanium-containing minerals from silicon impurities. Under alkaline conditions, a reagent 2 containing calcium, magnesium and aluminum complexing agents is used to selectively react with calcium impurities and magnesium-aluminum compound impurities to form a complex, thereby promoting the separation of titanium-containing minerals from calcium impurities and magnesium-aluminum compound impurities. Therefore, a titanium concentrate with a titanium dioxide content greater than or equal to 45% can be obtained, and the recovery rate of the titanium concentrate reaches more than 70%. Therefore, the method provided by the present invention can improve the recovery rate of titanium concentrate.

[0013] In addition, the method for recovering titanium concentrate from titanium tailings of vanadium-titanium magnetite according to the above embodiment of the present invention may have the following additional technical features:

[0014] In some embodiments of the present invention, the mass percentage of the reagent 1 to the mass of the primary treatment slurry is 0.005%-0.015%, thereby enabling selective complexation reaction with silicon impurities, thereby improving the recovery rate of titanium concentrate.

[0015] In some embodiments of the present invention, the reagent 1 includes a regulator, a strengthener, and a silicon complexing agent, thereby being able to selectively complex with silicon impurities, thereby improving the recovery rate of titanium concentrate.

[0016] In some embodiments of the present invention, the mass ratio of the regulator, the strengthening agent, and the silicon complexing agent is 1:1:(5-10), thereby improving the recovery rate of the titanium concentrate.

[0017] In some embodiments of the present invention, the conditioning agent includes at least one of sodium dodecyl carboxylate, sodium dodecyl sulfonate, sodium dodecylbenzene sulfonate, sodium hexadecyl carboxylate, sodium hexadecyl sulfonate, and sodium hexadecylbenzene sulfonate. This can adjust the surface potential of the mineral particles, thereby improving the recovery rate of the titanium concentrate.

[0018] In some embodiments of the present invention, the enhancer includes at least one of ammonium chloride, ammonium sulfate, ammonium phosphate, ammonium acetate, EDTA, and sodium EDTA. Thus, the enhancer can be combined with the silicon complexing agent to enhance the selectivity of the silicon complexing agent for silicon impurities, thereby improving the recovery rate of the titanium concentrate.

[0019] In some embodiments of the present invention, the silicon complexing agent includes at least one of anionic polyacrylamide, polyvinyl pyrrolidone, polyvinyl alcohol, and polyethylene glycol, thereby selectively complexing silicon impurities and improving the recovery rate of titanium concentrate.

[0020] In some embodiments of the present invention, the molecular weight of the polyvinyl pyrrolidone is 8,000-80,000, thereby promoting the selective complexation of silicon impurities and improving the recovery rate of titanium concentrate.

[0021] In some embodiments of the present invention, the molecular weight of the polyvinyl alcohol is 100,000-200,000, thereby promoting the selective complexation of silicon impurities and improving the recovery rate of titanium concentrate.

[0022] In some embodiments of the present invention, the molecular weight of the polyethylene glycol is 400-8000, thereby promoting the selective complexation of silicon impurities and improving the recovery rate of titanium concentrate.

[0023] In some embodiments of the present invention, the mass percentage of the reagent 2 to the mass percentage of the secondary treatment slurry is 0.005%-0.015%, thereby selectively reacting with calcium impurities and magnesium-aluminum compound impurities to improve the recovery rate of titanium concentrate.

[0024] In some embodiments of the present invention, the reagent 2 includes a calcium complexing agent and a magnesium aluminum complexing agent, thereby improving the recovery rate of the titanium concentrate.

[0025] In some embodiments of the present invention, the calcium complexing agent includes at least one of dodecylamine, hexadecylamine, octadecylamine, and morpholine, thereby improving the recovery rate of the titanium concentrate.

[0026] In some embodiments of the present invention, the magnesium-aluminum complexing agent includes at least one of sodium laurate, sodium oleate, sodium linoleate, sodium linolenate, sodium arachidonic acid, sodium palmitate, and sodium stearate. Thus, the magnesium-aluminum compound impurities can be selectively complexed, thereby improving the recovery rate of the titanium concentrate.

[0027] In some embodiments of the present invention, the vanadium-titanium magnetite titanium tailings are ground and mixed with water to form a slurry. After adjusting the pH to acidic, the slurry is mixed with reagent 1 to react to obtain a primary treated slurry with a particle size of 180-250 mesh. This improves the recovery rate of the titanium concentrate.

[0028] In some embodiments of the present invention, the vanadium-titanium magnetite titanium tailings are ground and mixed with water to form a slurry. After adjusting the pH to an acidic value, the slurry is mixed with reagent 1 to react to obtain a primary treated slurry having a solid content of 15% to 40%. This improves the recovery rate of the titanium concentrate.

[0029] In some embodiments of the present invention, the vanadium-titanium magnetite titanium tailings are ground and mixed with water to form a slurry. After adjusting the pH to acidic, the slurry is mixed with reagent 1 to react, resulting in a primary treated slurry with a pH of 3-5. Thus, under acidic conditions, reagent 1 can be more effectively utilized, thereby improving the recovery rate of the titanium concentrate.

[0030] In some embodiments of the present invention, the vanadium-titanium magnetite titanium tailings are ground and mixed with water to form a slurry. After adjusting the pH to acidic, the slurry is mixed with reagent 1 to react to obtain a primary treated slurry. The reaction time is 30 minutes to 200 minutes. This allows reagent 1 to fully react with mineral impurities, thereby improving the recovery rate of the titanium concentrate.

[0031] In some embodiments of the present invention, the step of removing the first complex from the primary processed slurry to obtain a first filter cake includes separating the primary processed slurry in a spiral chute to obtain a primary separated inner slurry and a primary separated outer slurry, and filtering the primary separated inner slurry to obtain the first filter cake. This can improve the recovery rate of the titanium concentrate.

[0032] In some embodiments of the present invention, the primary processed slurry is separated in a spiral chute to obtain a primary separation inner slurry and a primary separation outer slurry. The primary separation inner slurry is filtered to obtain a first filter cake in which the mass ratio of the primary separation inner slurry to the primary separation outer slurry is 1:(5-10). This can improve the recovery rate of the titanium concentrate.

[0033] In some embodiments of the present invention, the primary processed slurry is separated in a spiral chute to obtain a primary separation inner slurry and a primary separation outer slurry. The primary separation inner slurry is filtered to obtain a first filter cake. The separation time of the spiral chute is 5-12 minutes. This can promote the separation of mineral impurities and thus improve the recovery rate of titanium concentrate.

[0034] In some embodiments of the present invention, the first filter cake is ground and then mixed with water to form a slurry, the resulting slurry is subjected to magnetic separation to obtain a magnetic separation slurry and a magnetic residue slurry, and the magnetic separation slurry is filtered to obtain a magnetic separation concentrate. The magnetic flux of the magnetic separation is 0.4T-1.6T. This facilitates the selective magnetic attraction of ilmenite and titanomagnetite, thereby improving the recovery rate of the titanium concentrate.

[0035] In some embodiments of the present invention, the first filter cake is ground and then mixed with water to form a slurry, the resulting slurry is subjected to magnetic separation to obtain magnetic separation slurry and magnetic residue slurry, and the magnetic separation slurry is filtered to obtain a magnetic separation concentrate, wherein the ground particle size is 250-350 mesh. This improves the recovery rate of the titanium concentrate.

[0036] In some embodiments of the present invention, the first filter cake is ground and mixed with water to form a slurry, the resulting slurry is subjected to magnetic separation to obtain a magnetic separation slurry and a magnetic residue slurry, and the magnetic separation slurry is filtered to obtain a magnetic separation concentrate. The solid content of the slurry is 15%-40%, thereby improving the recovery rate of the titanium concentrate.

[0037] In some embodiments of the present invention, the pH of the magnetic residue slurry is adjusted to alkaline, and then mixed with the reagent 2 to react, resulting in a secondary treatment slurry with a pH of 8-10. Thus, under alkaline conditions, the reagent 2 can be more effectively utilized, thereby improving the recovery rate of the titanium concentrate.

[0038] In some embodiments of the present invention, after adjusting the pH value of the magnetic residue slurry to alkaline, it is mixed with reagent 2 to react to obtain a secondary treatment slurry, and the reaction time is 30 minutes to 200 minutes. This can promote the separation of impurities and thus improve the recovery rate of titanium concentrate.

[0039] In some embodiments of the present invention, the step of removing the second complex from the secondary treated slurry to obtain a second filter cake, and combining the second filter cake with the magnetic separation concentrate and drying it to obtain the titanium concentrate includes: separating the secondary treated slurry by a spiral chute to obtain a secondary separation inner slurry and a secondary separation outer slurry, and filtering the secondary separation inner slurry to obtain the second filter cake. This can improve the recovery rate of the titanium concentrate.

[0040] In some embodiments of the present invention, the secondary treated slurry is separated in a spiral chute to obtain a secondary separation inner slurry and a secondary separation outer slurry, the secondary separation inner slurry is filtered to obtain a second filter cake, and the second filter cake is combined with the magnetic separation concentrate and dried to obtain a titanium concentrate in which the mass ratio of the secondary separation inner slurry to the secondary separation outer slurry is 1:(5-10). This is conducive to improving the recovery rate of the titanium concentrate.

[0041] In some embodiments of the present invention, the secondary treated slurry is separated in a spiral chute to obtain a secondary separation inner slurry and a secondary separation outer slurry. The secondary separation inner slurry is filtered to obtain a second filter cake. The second filter cake is combined with the magnetic separation concentrate and dried to obtain the titanium concentrate. The separation time of the spiral chute is 4-8 minutes. This can promote the separation of impurities and thus improve the recovery rate of the titanium concentrate.

[0042] In some embodiments of the present invention, the secondary treated slurry is separated in a spiral chute to obtain a secondary separation inner slurry and a secondary separation outer slurry. The secondary separation inner slurry is filtered to obtain a second filter cake. The second filter cake is combined with the magnetic separation concentrate and dried to obtain the titanium concentrate. The drying temperature is 105°C-110°C. This is conducive to drying the titanium-containing minerals and improving the recovery rate of the titanium concentrate.

[0043] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments with reference to the accompanying drawings, in which:

[0045] Figure 1 A schematic diagram of a process for recovering titanium concentrate from titanium tailings of vanadium-titanium magnetite according to an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0046] The embodiments of the present invention are described in detail below. The embodiments described below are exemplary and are only used to explain the present invention, and should not be understood as limiting the present invention.

[0047] It should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, features defined as "first" or "second" may explicitly or implicitly include one or more of such features. Furthermore, in the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0048] The main titanium-containing minerals in vanadium-titanium magnetite tailings are ilmenite and titanomagnetite. The main impurity elements are silicon (30%-40% based on SiO2), calcium (5%-15% based on CaO), magnesium (10%-20% based on MgO), aluminum (10%-20% based on Al2O3), and iron (5-10% based on Fe2O3) that is not bound to titanium. These elements are found in minerals such as titanopyroxene, titanoamphibole, olivine, eddingite, chlorite, biotite, plagioclase, hematite, and limonite. The main titanium-containing minerals in vanadium-titanium magnetite tailings are ilmenite and titanomagnetite, which have similar surface physical and chemical properties to some gangue minerals (olivine, chlorite, and titanopyroxene), complex associated components, and finely embedded particles, making separation and enrichment difficult.

[0049] The existing technology for recovering titanium from vanadium-titanium magnetite titanium tailings mainly relies on a combination of two or more methods such as weak magnetic separation, strong magnetic separation, gravity separation, flotation, electrostatic separation, and ball mill classification. Since the titanium tailings from Panxi vanadium-titanium magnetite are generally hard and contain fine titanium mineral particles and low grade, and the recovery rate of titanium concentrate with existing technology is mostly below 50%, the recovery rate of titanium concentrate is low, which also causes waste of titanium resources.

[0050] In view of this, in one aspect of the present invention, the present invention proposes a method for recovering titanium concentrate from vanadium-titanium magnetite titanium tailings. According to an embodiment of the present invention, as Figure 1 As shown, the method includes:

[0051] S100: Grind the vanadium-titanium magnetite titanium tailings and mix them with water to form a slurry. After adjusting the pH value to acidic, mix and react with agent 1 to obtain a primary treated slurry, wherein the agent 1 can complex with silicon to form a first complex.

[0052] The main titanium minerals in the vanadium-titanium magnetite titanium tailings (hereinafter referred to as titanium tailings) are ilmenite and titanomagnetite, and the main impurity elements are silicon (30-40% in terms of SiO2), calcium (5%-15% in terms of CaO), magnesium (10%-20% in terms of MgO), aluminum (10%-20% in terms of Al2O3), and iron not combined with titanium (5%-10% in terms of Fe2O3). If high-quality titanium concentrate is to be recovered from the titanium tailings, the impurities in the titanium tailings need to be removed. Therefore, in this step, the titanium tailings are first ground and then mixed with water to form a slurry. The physical grinding can enable the titanium minerals and mineral impurities in the titanium tailings to be initially separated. At the same time, mixing with water is beneficial to the removal of impurities, thereby improving the recovery rate of the titanium concentrate.

[0053] It should be noted that there is no special restriction on the method of grinding the titanium tailings from vanadium-titanium magnetite, and those skilled in the art can choose according to actual needs. According to a specific embodiment of the present invention, the titanium tailings are ground by ball mill grinding. Specifically, the titanium tailings are first added with water to form a slurry with a solid content of 40%-60%, for example, the solid content can be 43%-57%, 45%-55%, 48%-50%, etc., and then the configured slurry is sent to the ball mill for grinding, and then the ground slurry is placed in a stirring tank, and water is added to adjust the slurry so that the solid content of the slurry is 15%-40%, for example, the solid content of the slurry can be 17%-38%, 20%-35%, 25%-30%, etc. Thus, the separation of titanium minerals and impurity minerals can be promoted by physical grinding, and the ground titanium tailings are mixed with water, which is conducive to the further separation of impurity minerals, thereby improving the recovery rate of titanium concentrate. It should be further explained that the solid content refers to the percentage of solid components in a mixture. In the embodiment of the present invention, the solid content refers to the mass percentage of titanium tailings in the prepared slurry.

[0054] According to one embodiment of the present invention, the grinding particle size is 180 mesh-220 mesh, for example, the grinding particle size can be 185 mesh-215 mesh, 190 mesh-210 mesh, 195 mesh-200 mesh, etc. Since the titanium tailings are ground once and the titanium tailings need to be chemically separated later, it is only necessary to coarsely grind the minerals during one grinding and keep the particle size within the above range. Therefore, the energy consumption of grinding can be reduced and the recovery efficiency of titanium concentrate can be improved.

[0055] According to one embodiment of the present invention, the pH value of the slurry is adjusted to acidic. Under acidic conditions, the surface of the mineral impurities is positively charged, while the ions of reagent 1 are negatively charged. The anionic surfactant of reagent 1 selectively complexes the mineral impurities, thereby removing the mineral impurities and improving the recovery rate of the titanium concentrate.

[0056] According to one embodiment of the present invention, the pH value is 3-5, for example, the pH value can be 3.5-4.8, 3.7-4.5, 3.8-4, etc. Under acidic conditions, the surface of the mineral impurity particles will be positively charged, and the anionic surfactant in the reagent 1 containing the silicon complexing agent can react with the positively charged silicon impurities. Thus, the pH value of the slurry after grinding is limited to the upper range value, which is beneficial to the complexing effect of the reagent 1 on the silicon impurities, thereby improving the recovery rate of the titanium concentrate.

[0057] According to one embodiment of the present invention, the acidic pH regulator is selected from an acidic substance. Common acidic substances can more easily adjust the pH of the slurry. The specific type of acidic substance is not particularly limited and can be selected by those skilled in the art according to actual needs. As a specific example, the acidic substance includes at least one of sulfuric acid, hydrochloric acid, phosphoric acid, acetic acid, and citric acid. Therefore, the use of the above acidic substances as acidic pH regulators can effectively adjust the pH of the slurry to a pH range of 3-5, which is conducive to improving the recovery rate of titanium concentrate. Furthermore, in order to maximize the regulating effect of the acidic substance, when selecting the above acidic substances, one or more of the above acidic substances can be mixed to form a mixed solution with a mass fraction of 5%-10%. For example, the mass fraction of the solution can be 6%-9%, 7%-8%, 8%-10%, etc., and then the solution within the above mass fraction range is used to adjust the pH of the slurry to acidic. This can remove carbonate mineral impurities and improve the recovery rate of titanium concentrate.

[0058] To separate and remove mineral impurities, the slurry is adjusted to an acidic pH before being mixed with reagent 1 to produce a primary treated slurry. Reagent 1, which can complex with silicon to form a first complex, is added. The addition of reagent 1, which has a complexing effect on silicon, can react with the silicon impurities to form a new compound, the first complex. This selectively removes silicon impurities from titanium tailings, improving the recovery rate of titanium concentrate. Furthermore, reagent 1 can promote the chemical separation of titanium-containing minerals from impurity minerals, improving the separation of impurity particles and reducing grinding costs.

[0059] It should be noted that the silicon in “the agent 1 can complex with silicon” refers to silicon impurities in titanium tailings, and the silicon impurities can exist in the form of silicon-containing compounds, such as silicon oxide, silicate, etc.

[0060] According to one embodiment of the present invention, the time for the mixing reaction of the agent 1 and the slurry is 30min-200min, for example, the reaction time can be 35min-180min, 50min-150min, 70min-110min, etc. Within the above reaction time range, the agent 1 can fully react with the mineral impurities, effectively remove the mineral impurities, and improve the recovery rate of the titanium concentrate.

[0061] According to one embodiment of the present invention, the mass of the agent 1 accounts for a percentage of 0.005%-0.015% of the mass of the primary treatment slurry. For example, the mass percentage can be 0.006%-0.013%, 0.007%-0.011%, 0.008%-0.010%, etc. When the amount of agent 1 added is too little, the complexing effect on silicon impurities is weak, which is not conducive to the removal of silicon impurities. However, when the amount of agent 1 added is too much, agent 1 may be coated on the surface of the mineral powder, affecting the complexing effect of the silicon complexing agent on silicon impurities. Therefore, when the mass ratio of agent 1 to the primary treatment slurry is within the above range, it can effectively remove silicon impurities while improving the dissociation rate of mineral impurity particles, thereby improving the recovery rate of titanium concentrate.

[0062] According to one embodiment of the present invention, the reagent 1 includes a regulator, a strengthener, and a silicon complexing agent. The main purpose of adding the reagent 1 is to remove silicon impurities. Therefore, the silicon complexing agent is an important component of the reagent 1. The silicon complexing agent contains a certain amount of polar groups in its molecular chain, which can complex silicon impurities suspended in water, forming bridges between the silicon impurities to form large flocs, thereby removing the silicon impurities. The regulator can adjust the potential of the silicon impurity surface, thereby making the silicon impurities more easily captured by the silicon complexing agent. The strengthener can combine with the silicon complexing agent to enhance the complexing ability of the silicon complexing agent, thereby removing the silicon impurities.

[0063] According to one embodiment of the present invention, the mixing ratio of the regulator, strengthener, and silicon complexing agent in reagent 1 is not particularly limited and can be selected by those skilled in the art according to actual needs. According to a specific embodiment of the present invention, the mass ratio of the regulator, strengthener, and silicon complexing agent is 1:1:(5-10). For example, the mass ratio can be 1:1:(5-9), 1:1:(5-8), 1:1:(5-6), etc. The inventors have found that when the content of the silicon complexing agent is too low, the complexing effect on silicon impurities is weak, affecting the removal of silicon impurities; when the content of the silicon complexing agent is too high, the concentration of the silicon complexing agent in the solution is very high, and the surface of the silicon impurities is completely covered by the complexed silicon complexing agent, and the particles will no longer flocculate through complexation. Therefore, adopting the mass ratio proposed in this embodiment of the present invention can improve the recovery rate of titanium concentrate.

[0064] According to one embodiment of the present invention, the conditioning agent includes at least one of sodium dodecyl carboxylate, sodium dodecyl sulfonate, sodium dodecylbenzene sulfonate, sodium hexadecyl carboxylate, sodium hexadecyl sulfonate, and sodium hexadecylbenzene sulfonate. Thus, the use of such conditioning agents can adjust the surface potential of silicon impurities, making them more easily captured by the silicon complexing agent, thereby removing the silicon impurities.

[0065] According to one embodiment of the present invention, the strengthening agent includes at least one of ammonium chloride, ammonium sulfate, ammonium phosphate, ammonium acetate, EDTA, and sodium EDTA. Thus, the strengthening agent can be combined with the silicon complexing agent to enhance the complexing ability of the silicon complexing agent, thereby removing silicon impurities.

[0066] According to one embodiment of the present invention, the silicon complexing agent includes at least one of anionic polyacrylamide, polyvinyl pyrrolidone, polyvinyl alcohol, and polyethylene glycol. Thus, the silicon complexing agent can complex silicon impurities suspended in water to form large flocs, thereby removing silicon impurities. Furthermore, the molecular weight of the polyvinyl pyrrolidone is 8,000-80,000, for example, the molecular weight of vinyl pyrrolidone can be 9,000-60,000, 15,000-55,000, 30,000-40,000, etc.; the molecular weight of the polyvinyl alcohol is 100,000-200,000, for example, the molecular weight of polyvinyl alcohol can be 120,000-190,000, 150,000-170,000, 160,000-180,000, etc.; and the molecular weight of the polyethylene glycol is 400-8,000, for example, the molecular weight of polyethylene glycol can be 600-6,000, 1,000-6,000, 2,000-4,000, etc. Thus, the complexing ability of the silicon complexing agent can be improved, thereby facilitating the removal of silicon impurities.

[0067] In order to better exert the selective complexing ability of the silicon complexing agent for silicon impurities, according to one embodiment of the present invention, the above-selected silicon complexing agent or several mixed silicon complexing agents are first configured into a solution with a mass fraction of 0.1%-1%. For example, the mass fraction of the silicon complexing agent can be 0.2%-0.9%, 0.3%-0.8%, 0.4%-0.6%, etc., and then mixed with the regulator and the enhancer. In this way, the complexing ability of the agent 1 for silicon impurities can be improved, which is beneficial to the removal of silicon impurities and the improvement of the recovery rate of titanium concentrate.

[0068] S200: removing the first complex from the primary treatment slurry to obtain a first filter cake.

[0069] In this step, in order to obtain titanium-containing minerals with a higher content, it is necessary to remove the impurity minerals in the once-treated slurry, and then obtain the first filter cake of preliminary separation through separation filtration. It should be noted that the main component of the impurity minerals removed here is the silicon impurity that undergoes a complex reaction with the reagent 1, thereby improving the recovery rate of the titanium concentrate.

[0070] According to one embodiment of the present invention, the method for removing the first complex is not particularly limited and can be selected by those skilled in the art as needed. According to a specific embodiment of the present invention, a spiral chute can be selected to separate the impurity minerals for removing the first complex. Specifically, the primary processed slurry is separated by a spiral chute to obtain a primary separation inner slurry and a primary separation outer slurry. The primary separation inner slurry is filtered to obtain a first filter cake. Thus, the spiral chute can separate titanium-containing minerals from impurity minerals, improve separation efficiency, and increase the recovery rate of titanium concentrate.

[0071] It should be noted that a spiral chute is a slurry fed into a partially inclined chute or surface. The water flow, aiding the loosening and stratification of mineral particles, allows the lightest minerals in the upper portion to drain rapidly outward, while the heavier minerals in the lower portion remain stagnant in the inner trough or are discharged more slowly from the lower portion, resulting in concentrate and tailings. Specifically, the separation process of titanium tailings particles in a spiral chute generally proceeds through three stages. In the first stage, as the titanium tailings particles move across the chute surface, heavy minerals (such as titanium-containing minerals) settle quickly, sinking to the lower layers of the liquid flow, while light minerals (such as mineral impurities) settle more slowly, floating on the upper layers. The vertical disturbance of the liquid flow reinforces the density stratification of the titanium tailings particles. In the second stage, the mineral impurities and titanium-containing minerals, building on the first stage, spread out laterally. The titanium-containing minerals sink to the lower layers, experiencing less centrifugal force. The thrust of the horizontal water flow toward the inner edge and the downward force generated by the weight of the titanium tailings particles overcome friction at the bottom of the chute and centrifugal force, gradually moving the titanium-containing minerals inward along a converging spiral. The mineral impurities floating on the upper layer are subject to a strong centrifugal force, which, combined with the thrust of the lateral water flow toward the outer edge, gradually moves outward along the expanding spiral line. In the third stage, titanium tailings particles of different densities move along their respective gyration radii. Mineral impurities and titanium-containing minerals are evenly arranged horizontally from the outer edge to the inner edge. The interceptor at the discharge end separates the ore belt horizontally into two parts: the inner and outer pulp, and discharges them through their respective discharge pipes, thus completing the sorting process.

[0072] According to one embodiment of the present invention, the number of the spiral chutes is greater than or equal to 3. The use of multi-stage spiral chutes for separation can remove mineral impurities from coarse to fine, thereby improving the separation efficiency of titanium-containing minerals and mineral impurities and increasing the recovery rate of titanium concentrate.

[0073] According to one embodiment of the present invention, there is no special restriction on the connection mode between the spiral chutes, and those skilled in the art can choose according to actual needs. According to a specific embodiment of the present invention, the connection mode between the spiral chutes is in series. Specifically, the slurry outside the slurry outlet of the first spiral chute enters the feed port of the second spiral chute, and the slurry outside the second spiral chute enters the inlet of the third spiral chute, and so on. The slurry inside the outlet of each level of spiral chute is collected as the primary separation slurry.

[0074] According to one embodiment of the present invention, the separation time of each spiral chute is 5min-12min, for example, the separation time can be 5min-10min, 5min-8min, 5min-6min, etc. Therefore, by setting the separation time of each spiral chute within the above range, the titanium-containing minerals and mineral impurities can be fully separated, thereby improving the recovery rate of titanium concentrate.

[0075] In order to recycle the medicine 1, the medicine 1 can be recycled, such as Figure 1 As shown, after filtering the primary separated slurry, the filtrate obtained is returned to the primary slurry preparation for recycling. In addition, the slurry outside the last spiral chute is filtered, and the filtrate obtained is also returned to the primary slurry preparation for recycling, and the filter cake is subjected to a residue removal process. This can improve the utilization rate of the reagent 1.

[0076] According to one embodiment of the present invention, the mass ratio of the primary separation inner pulp to the primary separation outer pulp is 1:(5-10), for example, the mass ratio may be 1:(5-9), 1:(5-8), 1:(5-6), etc. This can improve separation efficiency and increase the recovery rate of titanium concentrate.

[0077] S300: Grinding the first filter cake and mixing it with water to form a slurry, subjecting the obtained slurry to magnetic separation to obtain magnetic separation slurry and magnetic residual slurry, and filtering the magnetic separation slurry to obtain magnetic separation concentrate.

[0078] In this step, the first filter cake is ground and mixed with water to form a slurry. Specifically, the first filter cake obtained above is added with water to form a slurry with a solid content of 40%-60%, for example, the solid content can be 43%-57%, 45%-55%, 48%-50%, etc., and then the slurry is placed in a secondary ball mill for grinding, and then placed in a stirring tank and water is added to adjust the solid content to 15%-40%. For example, the solid content of the slurry can be 17%-38%, 20%-35%, 25%-30%, etc., thereby performing a preliminary physical separation of titanium minerals and mineral impurities by grinding, which is beneficial to the subsequent separation of mineral impurities, thereby improving the recovery rate of titanium concentrate. It should be noted that the solid content has been explained above and will not be repeated here.

[0079] According to one embodiment of the present invention, the particle size of the first filter cake after grinding is 250 mesh-350 mesh, for example, the particle size can be 260 mesh-330 mesh, 280 mesh-310 mesh, 290 mesh-300 mesh, etc. Within the above particle size range, it is conducive to the separation of mineral impurities and can improve the recovery rate of titanium concentrate.

[0080] The main components of titanium tailings are titanium-containing minerals and mineral impurities, and the main components of titanium-containing minerals are ilmenite and titanomagnetite. Since ilmenite and titanomagnetite have certain magnetic properties, while mineral impurities generally have no magnetic properties or have weak magnetic properties, ilmenite and titanomagnetite can be separated by magnetic separation to obtain titanium concentrate. Specifically, Figure 1 As shown, the slurry after secondary grinding is pumped into a magnetic separator, and magnetic flux is set for magnetic separation to obtain magnetic separation slurry and magnetic residual slurry. The magnetic separation slurry is filtered, and the filter residue obtained is a magnetic separation concentrate, that is, a mixture of ilmenite and titanomagnetite.

[0081] It should be noted that magnetic separation is a mineral processing method that utilizes magnetic differences between minerals in an inhomogeneous magnetic field to separate them. Specifically, a magnetic separator is used for magnetic separation. After the slurry flows through the ore box and into the trough, water flow from the feed water pipes loosens the ore particles into the feed area of ​​the trough. Under the influence of the magnetic field, the magnetic ore particles (ilmenite and titanomagnetite) gather to form "magnetic clusters" or "magnetic chains." These "magnetic clusters" or "magnetic chains" in the slurry are affected by the magnetic force and move toward the magnetic poles, where they are attracted to the drum. Because the polarity of the magnetic poles alternates along the direction of the drum's rotation, they remain stationary during operation. As the magnetic poles rotate with the drum, the alternating magnetic poles generate magnetic agitation. Non-magnetic minerals such as gangue and other "magnetic chains" trapped in the "magnetic clusters" or "magnetic chains" are dislodged during the rotation process and ultimately drawn onto the drum surface. These "magnetic clusters" or "magnetic chains" are the titanium concentrate. The titanium concentrate moves along the cylinder to the weakest magnetic force at the edge of the magnetic system, and is discharged into the concentrate tank under the action of the flushing water flow sprayed from the unloading water pipe. Therefore, magnetic separation pulp and magnetic residual pulp are produced after magnetic separation.

[0082] According to one embodiment of the present invention, the magnetic flux of the magnetic separation is 0.4T-1.6T. For example, the magnetic flux can be 0.5T-1.3T, 0.6T-1.1T, 0.8T-1.0T, etc. When the magnetic flux is too low, ilmenite and titanomagnetite cannot be effectively separated; however, when the magnetic flux is too large, the service life of the magnetic separator will be affected. Therefore, the magnetic flux range provided in the embodiment of the present invention can effectively separate the titanium concentrate and improve the recovery rate of the titanium concentrate.

[0083] S400: After adjusting the pH value of the magnetic slurry to alkaline, the slurry is mixed with the reagent 2 to react to obtain a secondary treatment slurry, wherein the reagent 2 can be complexed with calcium, aluminum and magnesium to form a second complex.

[0084] It should be noted that the "second complex" refers to the calcium complex formed by the complex reaction between the reagent 2 and the calcium impurity, and the magnesium-aluminum complex formed by the complex reaction between the reagent 2 and the magnesium-aluminum compound.

[0085] In this step, to further promote the separation of mineral impurities, in one embodiment of the present invention, the pH of the magnetic slurry is adjusted to alkaline before being mixed with reagent 2, wherein reagent 2 can complex with calcium, aluminum, and magnesium to form a second complex. Thus, under alkaline conditions, the surface of the mineral impurity particles is negatively charged, while reagent 2 has a positive charge, which can enhance the complexation of reagent 2 with the mineral impurities, thereby promoting the separation of titanium-containing minerals from mineral impurities and improving the recovery rate of titanium concentrate.

[0086] According to one embodiment of the present invention, the pH value is 8-10, for example, the pH value may be 8.3-9.8, 8.5-9.5, 8.6-9.3, etc. Thus, within the above pH value range, the dissociation of mineral impurities can be promoted, thereby improving the recovery rate of titanium concentrate.

[0087] According to one embodiment of the present invention, the above-mentioned alkaline pH regulator is selected from alkaline substances. The pH value of the slurry can be more simply adjusted to alkaline by using common alkaline substances. The specific type of alkaline substance is not particularly limited. Those skilled in the art can select it according to actual needs. As a specific example, the alkaline substance includes at least one of sodium hydroxide, calcium hydroxide, ammonia, ammonium carbonate, sodium carbonate and sodium bicarbonate. Thus, the above-mentioned alkaline substance is selected as the alkaline pH regulator, which can effectively adjust the pH value of the slurry to alkaline, which is conducive to promoting the dissociation of mineral impurities and improving the recovery rate of titanium concentrate. Further, in order to exert the regulating effect of the alkaline substance, when selecting the above-mentioned alkaline substance, it is necessary to first mix the above-mentioned one or more alkaline substances to form a mixed solution with a mass fraction of 5%-10%, for example, the mass fraction of the solution can be 6%-9%, 7%-8%, 8%-10%, etc., and then use the alkaline solution within the above-mentioned mass fraction range to adjust the pH value of the slurry to alkaline, thereby improving the recovery rate of titanium concentrate.

[0088] According to one embodiment of the present invention, the mixing reaction time is 30min-200min, for example, the reaction time can be 50min-180min, 80min-130min, 90min-100min, etc. Within the above reaction time range, the reagent 2 can fully react with the mineral impurities, effectively remove the mineral impurities, and improve the recovery rate of the titanium concentrate.

[0089] It should be noted that calcium, aluminum and magnesium in "the agent 1 can be complexed with calcium, aluminum and magnesium" refer to calcium impurities, magnesium impurities and aluminum impurities in titanium tailings. The calcium impurities can exist in the form of calcium-containing compounds, such as calcium oxide, calcium carbonate, etc. Similarly, the aluminum impurities can exist in the form of aluminum-containing compounds, such as aluminum oxide, aluminum-magnesium compounds, etc. Magnesium is easily combined with aluminum in minerals, so magnesium impurities are mainly magnesium-aluminum compounds.

[0090] According to one embodiment of the present invention, according to one embodiment of the present invention, the mass of the reagent 2 accounts for 0.005%-0.015% of the mass of the secondary treatment slurry, for example, the mass percentage can be 0.006%-0.013%, 0.007%-0.011%, 0.008%-0.010%, etc. When the amount of reagent 2 added is too little, the complexing effect on calcium, aluminum and magnesium impurities is weak, which is not conducive to the removal of calcium impurities and magnesium-aluminum impurities. However, when the amount of reagent 2 added is too much, the reagent 2 will be wrapped on the surface of the mineral powder, hindering the complexing of the calcium complexing agent and the magnesium-aluminum complexing agent with the mineral impurities, thereby affecting the removal of calcium impurities and magnesium-aluminum impurities. Therefore, when the mass ratio of reagent 2 to the secondary treatment slurry is within the above range, calcium impurities and magnesium-aluminum impurities can be effectively removed, thereby improving the recovery rate of titanium concentrate.

[0091] According to one embodiment of the present invention, the reagent 2 includes a calcium complexing agent and a magnesium-aluminum complexing agent. The calcium complexing agent can complex with calcium impurities, causing the calcium impurities to dissociate from the titanium-containing mineral, which is beneficial to the separation of mineral impurities; the magnesium-aluminum complexing agent can complex on the surface of the magnesium-aluminum impurities, causing the magnesium-aluminum impurities to separate from the titanium-containing mineral, which is beneficial to the dissociation of mineral impurities, thereby improving the recovery rate of titanium concentrate.

[0092] According to one embodiment of the present invention, the mixing ratio of the calcium complexing agent and the magnesium-aluminum complexing agent in the reagent 2 is not particularly limited, and those skilled in the art can make a selection according to actual needs. According to a specific embodiment of the present invention, the mass ratio of the calcium complexing agent to the aluminum complexing agent is 1:1. When the content of the calcium complexing agent is too low, it will affect the removal of calcium impurities; when there is too much calcium complexing agent, the corresponding magnesium-aluminum complexing agent will be too little, which will affect the removal of magnesium-aluminum impurities. Therefore, under the above ratio, calcium impurities and magnesium-aluminum impurities can be removed at the same time, thereby improving the recovery rate of titanium concentrate.

[0093] According to one embodiment of the present invention, the calcium complexing agent includes at least one of dodecylamine, hexadecylamine, octadecylamine, and morpholine. The selection of the above calcium complexing agent can selectively complex calcium impurities, thereby improving the removal efficiency of calcium impurities and further improving the recovery rate of titanium concentrate.

[0094] According to one embodiment of the present invention, the magnesium-aluminum complexing agent includes at least one of sodium laurate, sodium oleate, sodium linoleate, sodium linolenate, sodium arachidonic acid, sodium palmitate, and sodium stearate. In the ore, magnesium and aluminum cannot exist independently and are easily combined to form magnesium-aluminum compounds. Therefore, the selection of the aluminum complexing agent can selectively complex magnesium-aluminum impurities, effectively removing them and improving the recovery rate of the titanium concentrate.

[0095] S500: removing the second complex from the secondary treatment slurry to obtain a second filter cake, combining the second filter cake with the magnetic separation concentrate and drying to obtain titanium concentrate.

[0096] In this step, in order to obtain titanium-containing minerals with a higher content, it is necessary to remove the impurity minerals in the secondary treatment slurry, and then obtain a second filter cake containing titanium concentrate by separation and filtration. It should be noted that the main components of the impurity minerals removed here are calcium impurities and magnesium-aluminum compound impurities that undergo complex reactions with reagent 2, thereby improving the recovery rate of titanium concentrate.

[0097] According to one embodiment of the present invention, the method for removing the second complex is not particularly limited, and those skilled in the art can select it as needed. According to a specific embodiment of the present invention, a spiral chute can be selected to separate the impurity minerals for the method of removing the second complex. Specifically, the secondary treatment slurry is spirally separated to obtain a secondary separation inner slurry and a secondary separation outer slurry. The secondary separation inner slurry is filtered to obtain a second filter cake. The second filter cake is combined with the magnetic separation concentrate and dried to obtain a titanium concentrate.

[0098] It should be noted that the principle of the spiral chute, the number of spiral chutes, the connection method of the spiral chute, and the mass ratio range of the secondary separation inner slurry and the secondary separation outer slurry during the spiral chute separation process are the same as the settings of the primary spiral chute separation mentioned above, and will not be repeated here.

[0099] According to one embodiment of the present invention, the time for each spiral chute separation during the secondary spiral chute separation process is 4min-8min. For example, the separation time can be 4min-7min, 5min-6min, 6min-8min, etc. Within the above separation time range, the titanium minerals and mineral impurities are fully separated, which is beneficial to the removal of mineral impurities and can improve the recovery rate of titanium concentrate.

[0100] According to one embodiment of the present invention, the drying temperature is 105°C-110°C. For example, the drying temperature can be 106°C-109°C, 107°C-108°C, 105°C-106°C, etc. The inventors have found that when the drying temperature is too low, the drying time will be delayed, increasing the time cost. However, when the drying temperature is too high, it may cause chemical reactions in the titanium-containing minerals, thereby affecting the recovery of titanium dioxide. Therefore, adopting the drying temperature within the above range is conducive to improving the recovery rate of titanium concentrate.

[0101] According to a specific embodiment of the present invention, Figure 1 The figure shows the process flow of the method in detail. Specifically, the titanium tailings raw material is first ground and water is added to form a slurry. Then, under acidic conditions, reagent 1 is added to the slurry for mixed reaction and then sent to a spiral chute for primary separation. The outer slurry of the primary separation is filtered, and the filtrate is recovered as the slurry for the primary grinding; the inner slurry of the primary separation is then filtered, and the filtered filtrate is recovered as the slurry for the primary grinding, and the filter residue is collected as the first filter cake; the first filter cake is then ground a second time and water is added to form a slurry, and the obtained slurry is sent to a magnetic separator for magnetic separation, so as to obtain magnetic separation slurry and magnetic residual slurry. The magnetic separation slurry is filtered, and the obtained filter residue is magnetic separation concentrate, and the filtrate is collected as the slurry for the secondary grinding; reagent 2 is added to the magnetic residual slurry under alkaline adjustment and mixed for reaction, and then a secondary separation is performed to obtain the inner slurry of the secondary separation and the outer slurry of the secondary separation. The inner slurry of the secondary separation is filtered and recovered The filtrate can be used as slurry water for secondary separation, and the resulting filter residue is the second filter cake. The second filter cake and the magnetic concentrate are combined and dried to obtain titanium concentrate. The outer slurry of the secondary separation is filtered, and the filtrate is recovered as slurry for secondary grinding; the filter residue after the primary separation outer slurry filtration and the filter residue after the secondary separation outer slurry filtration are collected, and then the combined total filter residue is subjected to filter residue separation. Specifically, the total filter residue is added with water to form a slurry with a solid content of 15%-40%, and then reagent 1 is added. The resulting slurry is pumped into a 2-4 stage spiral chute. Here, the single-stage separation time, the ratio of the inner slurry and the outer slurry of each slurry outlet, and the connection method of the spiral chute are the same as those in the primary separation process. Then, the inner slurry after the filter residue separation is collected as the slurry for the primary grinding, and the outer slurry after the filter residue separation is collected for filtration. The filter residue obtained by filtration is discharged according to the waste residue regulations, and the filtered filtrate is recovered as the slurry for filter residue separation.

[0102] According to the method for recovering titanium concentrate from vanadium-titanium magnetite titanium tailings of the above embodiment of the present invention, first, physical grinding is performed to preliminarily separate titanium-containing minerals from mineral impurities, and then, under acidic conditions, a reagent 1 containing a silicon complexing agent is used to selectively react with silicon impurities to form a complex, thereby promoting the chemical separation of titanium-containing minerals from silicon impurities, and under alkaline conditions, a reagent 2 containing calcium, magnesium and aluminum complexing agents is used to selectively react with calcium impurities and magnesium-aluminum compound impurities to form a complex, thereby promoting the separation of titanium-containing minerals from calcium impurities and magnesium-aluminum compound impurities, and through two spiral chutes, titanium-containing minerals and mineral impurities can be effectively separated, and a titanium concentrate with a titanium dioxide content greater than or equal to 45% can be obtained, and the recovery rate of the titanium concentrate reaches more than 70%. In addition, after magnetic separation, the addition of reagent 2 to complex with calcium impurities and magnesium-aluminum impurities can improve the recovery rate of the titanium concentrate and also reduce the amount of reagent 2 used. Thus, the method provided by the present invention can improve the recovery rate of titanium concentrate.

[0103] The scheme of the present disclosure will be explained below in conjunction with the examples. Those skilled in the art will understand that the following examples are only used to illustrate the present disclosure and should not be considered to limit the scope of the present disclosure. Where specific techniques or conditions are not specified in the examples, they are carried out according to the techniques or conditions described in the literature in this area or according to the product instructions. Where the manufacturer of the reagents or instruments is not specified, they are all conventional products that can be obtained commercially.

[0104] Example 1

[0105] 1) Prepare 5% sulfuric acid solution as an acidic substance; prepare 5% sodium hydroxide solution as an alkaline substance; mix 10g of ethylenediaminetetraacetic acid, 10g of sodium lauryl carboxylate, and 50g of 1% polyethylene glycol (molecular weight 6000) solution as reagent 1; and mix 10g of dodecylamine, 10g of morpholine, and 20g of sodium oleate as reagent 2.

[0106] 2) The vanadium-titanium magnetite titanium tailings were added with water to prepare a slurry with a solid content of 50%, ground to 200 mesh with a ball mill, and then water was added to adjust the solid content to 20%. The pH of the slurry was adjusted to 3 with 5% sulfuric acid, and then reagent 1 was added and stirred at room temperature for 2 hours to obtain a primary treated slurry, wherein the mass percentage of reagent 1 in the primary treated slurry was 0.01%.

[0107] 3) Use a pump to send the primary treated slurry into a five-stage series spiral chute for separation, and control the separation time of each stage of the spiral chute to be 10 minutes to obtain the primary separation inner slurry and the primary separation outer slurry, and filter the primary separation inner slurry to obtain the first filter cake.

[0108] 4) The first filter cake is added with water to prepare a slurry with a solid content of 50%, which is then ground to 300 mesh using a ball mill. Water is then added to adjust the solid content to 20%, and the slurry is then pumped into a wet magnetic separator with a magnetic roller having a magnetic flux of 0.8 T to obtain magnetic separation slurry and magnetic residual slurry. The magnetic separation slurry is filtered to obtain a magnetic separation concentrate.

[0109] 5) The pH of the magnetic slurry was adjusted to 10 with 5% sodium hydroxide, and then reagent 2 was added and stirred at room temperature for 2 hours to obtain a secondary treatment slurry, wherein the mass percentage of reagent 2 in the secondary treatment slurry was 0.01%.

[0110] 6) Use a pump to send the secondary treated slurry into a five-stage series spiral chute for separation, and control the separation time of each stage of the spiral chute to 8 minutes to obtain secondary separation inner slurry and secondary separation outer slurry, and filter the secondary separation inner slurry to obtain a second filter cake, and then combine the second filter cake with the magnetic separation concentrate, and dry it at 105°C for 3 hours to obtain titanium concentrate.

[0111] Example 2

[0112] 1) Prepare 6% sulfuric acid solution as an acidic substance; 6% sodium hydroxide solution as an alkaline substance; 10g of ammonium chloride, 10g of sodium hexadecylbenzenesulfonate, and 50g of 0.05% polyacrylamide (anionic type, molecular weight 5 million) solution are mixed as reagent 1; 10g of octadecylamine and 10g of sodium oleate are mixed as reagent 2.

[0113] 2) The vanadium-titanium magnetite titanium tailings were added with water to prepare a slurry with a solid content of 50%, ground to 220 mesh with a ball mill, and then water was added to adjust the solid content to 20%. The pH of the slurry was adjusted to 3 with 6% sulfuric acid, and then reagent 1 was added and stirred at room temperature for 2 hours to obtain a primary treated slurry, wherein the mass percentage of reagent 1 in the primary treated slurry was 0.008%.

[0114] 3) Use a pump to send the primary treated slurry into a five-stage series spiral chute for separation, and control the separation time of each stage of the spiral chute to be 12 minutes to obtain the primary separation inner slurry and the primary separation outer slurry, and filter the primary separation inner slurry to obtain the first filter cake.

[0115] 4) The first filter cake is added with water to prepare a slurry with a solid content of 50%, which is then ground to 300 mesh using a ball mill. Water is then added to adjust the solid content to 20%, and the slurry is pumped into a wet magnetic separator with a magnetic roller having a magnetic flux of 0.8 T to obtain magnetic separation slurry and magnetic residual slurry. The magnetic separation slurry is filtered to obtain a magnetic separation concentrate.

[0116] 5) The pH of the magnetic slurry was adjusted to 10 with 6% sodium hydroxide, and then reagent 2 was added and stirred at room temperature for 2 hours to obtain a secondary treatment slurry, wherein the mass percentage of reagent 2 in the secondary treatment slurry was 0.008%.

[0117] 6) Use a pump to send the secondary treated slurry into a five-stage series spiral chute for separation, and control the separation time of each stage of the spiral chute to 8 minutes to obtain secondary separation inner slurry and secondary separation outer slurry, and filter the secondary separation inner slurry to obtain a second filter cake, and then combine the second filter cake with the magnetic separation concentrate, and dry it at 105°C for 3 hours to obtain titanium concentrate.

[0118] Example 3

[0119] 1) Prepare 5% nitric acid solution as an acidic substance; 6% sodium hydroxide solution as an alkaline substance; mix 10g of ammonium acetate, 10g of sodium hexadecylbenzenesulfonate, and 50g of 0.8% polyethylene glycol (anionic, molecular weight 2000) solution as reagent 1; and mix 10g of dodecylamine, 10g of hexadecylamine, and 20g of sodium arachidonic acid as reagent 2.

[0120] 2) The vanadium-titanium magnetite titanium tailings were added with water to prepare a slurry with a solid content of 50%, ground to 200 mesh with a ball mill, and then water was added to adjust the solid content to 16%. The pH of the slurry was adjusted to 3 with 5% nitric acid, and then reagent 1 was added and stirred at room temperature for 2 hours to obtain a primary treated slurry, wherein the mass percentage of reagent 1 in the primary treated slurry was 0.015%.

[0121] 3) Use a pump to send the primary treated slurry into a five-stage series spiral chute for separation, and control the separation time of each stage of the spiral chute to be 8 minutes to obtain the primary separation inner slurry and the primary separation outer slurry, and filter the primary separation inner slurry to obtain the first filter cake.

[0122] 4) The first filter cake is added with water to prepare a slurry with a solid content of 50%, and the slurry is ground to 320 mesh using a ball mill. Water is then added to adjust the solid content to 16%. The magnetic slurry is pumped into a wet magnetic separator with a magnetic flux of 0.8 T on the magnetic roller to obtain magnetic separation slurry and magnetic residual slurry. The magnetic separation slurry is filtered to obtain a magnetic separation concentrate.

[0123] 5) The pH of the magnetic slurry was adjusted to 9 with 6% sodium hydroxide, and then reagent 2 was added and stirred at room temperature for 2 hours to obtain a secondary treatment slurry, wherein the mass percentage of reagent 2 in the secondary treatment slurry was 0.015%.

[0124] 6) Use a pump to send the secondary treated slurry into a five-stage series spiral chute for separation, and control the separation time of each stage of the spiral chute to 8 minutes to obtain secondary separation inner slurry and secondary separation outer slurry, and filter the secondary separation inner slurry to obtain a second filter cake, and then combine the second filter cake with the magnetic separation concentrate, and dry it at 110°C for 3 hours to obtain titanium concentrate.

[0125] Example 4

[0126] 1) Prepare 5% nitric acid solution as an acidic substance; 5% ammonia water as an alkaline substance; mix 10g of ammonium acetate, 10g of sodium dodecylbenzenesulfonate, and 100g of 0.8% polyethylene glycol (anionic, molecular weight 2000) solution as agent 1; and mix 10g of hexadecylamine and 10g of sodium arachidonic acid as agent 2.

[0127] 2) The vanadium-titanium magnetite titanium tailings were added with water to prepare a slurry with a solid content of 50%, ground to 220 mesh with a ball mill, and then water was added to adjust the solid content to 20%. The pH of the slurry was adjusted to 3 with 5% nitric acid, and then reagent 1 was added and stirred at room temperature for 2 hours to obtain a primary treatment slurry, wherein the mass percentage of reagent 1 in the primary treatment slurry was 0.005%.

[0128] 3) Use a pump to send the primary treated slurry into a five-stage series spiral chute for separation, and control the separation time of each stage of the spiral chute to be 10 minutes to obtain the primary separation inner slurry and the primary separation outer slurry, and filter the primary separation inner slurry to obtain the first filter cake.

[0129] 4) The first filter cake is added with water to prepare a slurry with a solid content of 50%, and the slurry is ground to 320 mesh using a ball mill. Water is then added to adjust the solid content to 16%, and the slurry is pumped into a wet magnetic separator with a magnetic roller having a magnetic flux of 0.6 T to obtain magnetic separation slurry and magnetic residual slurry. The magnetic separation slurry is filtered to obtain a magnetic separation concentrate.

[0130] 5) The pH of the magnetic slurry was adjusted to 8 with 5% ammonia water, and then the reagent 2 was added and stirred at room temperature for 2 hours to obtain a secondary treatment slurry, wherein the mass percentage of the reagent 2 in the secondary treatment slurry was 0.005%.

[0131] 6) Use a pump to send the secondary treated slurry into a five-stage series spiral chute for separation, and control the separation time of each stage of the spiral chute to 8 minutes to obtain secondary separation inner slurry and secondary separation outer slurry, and filter the secondary separation inner slurry to obtain a second filter cake, and then combine the second filter cake with the magnetic separation concentrate, and dry it at 110°C for 3 hours to obtain titanium concentrate.

[0132] Example 5

[0133] 1) Prepare 10% hydrochloric acid solution as an acidic substance; 10% sodium hydroxide as an alkaline substance; mix 10g of ammonium sulfate, 10g of sodium lauryl carboxylate, and 100g of 0.3% polyvinyl pyrrolidone (anionic type, molecular weight 20,000) solution as agent 1; and mix 10g of hexadecylamine and 10g of sodium arachidonic acid as agent 2.

[0134] 2) The vanadium-titanium magnetite titanium tailings were added with water to prepare a slurry with a solid content of 50%, ground to 220 mesh with a ball mill, and then water was added to adjust the solid content to 15%. The pH of the slurry was adjusted to 4 with 10% hydrochloric acid, and then reagent 1 was added and stirred at room temperature for 2 hours to obtain a primary treated slurry, wherein the mass percentage of reagent 1 in the primary treated slurry was 0.008%.

[0135] 3) Use a pump to send the primary treated slurry into a five-stage series spiral chute for separation, and control the separation time of each stage of the spiral chute to be 10 minutes to obtain the primary separation inner slurry and the primary separation outer slurry, and filter the primary separation inner slurry to obtain the first filter cake.

[0136] 4) The first filter cake is added with water to prepare a slurry with a solid content of 50%, which is then ground to 300 mesh using a ball mill. Water is then added to adjust the solid content to 15%, and the slurry is pumped into a wet magnetic separator with a magnetic roller having a magnetic flux of 0.8 T to obtain magnetic separation slurry and magnetic residual slurry. The magnetic separation slurry is filtered to obtain a magnetic separation concentrate.

[0137] 5) The pH of the magnetic slurry was adjusted to 8 with 10% sodium hydroxide, and then reagent 2 was added and stirred at room temperature for 2 hours to obtain a secondary treatment slurry, wherein the mass percentage of reagent 2 in the secondary treatment slurry was 0.008%.

[0138] 6) Use a pump to send the secondary treated slurry into a four-stage series spiral chute for separation, and control the separation time of each stage of the spiral chute to 8 minutes to obtain secondary separation inner slurry and secondary separation outer slurry, and filter the secondary separation inner slurry to obtain a second filter cake, and then combine the second filter cake with the magnetic separation concentrate, and dry it at 110°C for 3 hours to obtain titanium concentrate.

[0139] Example 6

[0140] 1) Prepare 5% sulfuric acid solution as an acidic substance; prepare 5% sodium hydroxide solution as an alkaline substance; mix 10g of ethylenediaminetetraacetic acid, 10g of sodium lauryl carboxylate, and 50g of 1% polyethylene glycol (molecular weight 6000) solution as reagent 1; and mix 10g of dodecylamine, 10g of morpholine, and 20g of sodium oleate as reagent 2.

[0141] 2) The vanadium-titanium magnetite titanium tailings were added with water to prepare a slurry with a solid content of 50%, ground to 200 mesh with a ball mill, and then water was added to adjust the solid content to 20%. The pH of the slurry was adjusted to 5 with 5% sulfuric acid, and then the reagent 1 was added and stirred at room temperature for 2 hours to obtain a primary treatment slurry, wherein the mass percentage of the reagent 1 in the primary treatment slurry was 0.01%.

[0142] 3) Use a pump to send the primary treated slurry into a five-stage series spiral chute for separation, and control the separation time of each stage of the spiral chute to be 10 minutes to obtain the primary separation inner slurry and the primary separation outer slurry, and filter the primary separation inner slurry to obtain the first filter cake.

[0143] 4) The first filter cake is added with water to prepare a slurry with a solid content of 50%, which is then ground to 300 mesh using a ball mill. Water is then added to adjust the solid content to 20%, and the slurry is then pumped into a wet magnetic separator with a magnetic roller having a magnetic flux of 0.8 T to obtain magnetic separation slurry and magnetic residual slurry. The magnetic separation slurry is filtered to obtain a magnetic separation concentrate.

[0144] 5) The pH of the magnetic slurry was adjusted to 10 with 5% sodium hydroxide, and then reagent 2 was added and stirred at room temperature for 2 hours to obtain a secondary treatment slurry, wherein the mass percentage of reagent 2 in the secondary treatment slurry was 0.01%.

[0145] 6) Use a pump to send the secondary treated slurry into a five-stage series spiral chute for separation, and control the separation time of each stage of the spiral chute to 8 minutes to obtain secondary separation inner slurry and secondary separation outer slurry, and filter the secondary separation inner slurry to obtain a second filter cake, and then combine the second filter cake with the magnetic separation concentrate, and dry it at 105°C for 3 hours to obtain titanium concentrate.

[0146] Example 7

[0147] 1) Prepare 5% sulfuric acid solution as an acidic substance; prepare 5% sodium hydroxide solution as an alkaline substance; mix 10g of ethylenediaminetetraacetic acid, 10g of sodium lauryl carboxylate, and 50g of 1% polyethylene glycol (molecular weight 6000) solution as reagent 1; and mix 10g of dodecylamine, 10g of morpholine, and 20g of sodium oleate as reagent 2.

[0148] 2) The vanadium-titanium magnetite titanium tailings were added with water to prepare a slurry with a solid content of 50%, ground to 200 mesh with a ball mill, and then water was added to adjust the solid content to 20%. The pH of the slurry was adjusted to 3 with 5% sulfuric acid, and then reagent 1 was added and stirred at room temperature for 2 hours to obtain a primary treated slurry, wherein the mass percentage of reagent 1 in the primary treated slurry was 0.01%.

[0149] 3) Use a pump to send the primary treated slurry into a five-stage series spiral chute for separation, and control the separation time of each stage of the spiral chute to be 10 minutes to obtain the primary separation inner slurry and the primary separation outer slurry, and filter the primary separation inner slurry to obtain the first filter cake.

[0150] 4) The first filter cake is added with water to prepare a slurry with a solid content of 50%, which is then ground to 300 mesh using a ball mill. Water is then added to adjust the solid content to 20%, and the slurry is then pumped into a wet magnetic separator with a magnetic roller having a magnetic flux of 0.4 T to obtain magnetic separation slurry and magnetic residual slurry. The magnetic separation slurry is filtered to obtain a magnetic separation concentrate.

[0151] 5) The pH of the magnetic slurry was adjusted to 10 with 5% sodium hydroxide, and then reagent 2 was added and stirred at room temperature for 2 hours to obtain a secondary treatment slurry, wherein the mass percentage of reagent 2 in the secondary treatment slurry was 0.01%.

[0152] 6) Use a pump to send the secondary treated slurry into a five-stage series spiral chute for separation, and control the separation time of each stage of the spiral chute to 8 minutes to obtain secondary separation inner slurry and secondary separation outer slurry, and filter the secondary separation inner slurry to obtain a second filter cake, and then combine the second filter cake with the magnetic separation concentrate, and dry it at 105°C for 3 hours to obtain titanium concentrate.

[0153] Example 8

[0154] 1) Prepare 5% sulfuric acid solution as an acidic substance; prepare 5% sodium hydroxide solution as an alkaline substance; mix 10g of ethylenediaminetetraacetic acid, 10g of sodium lauryl carboxylate, and 50g of 1% polyethylene glycol (molecular weight 6000) solution as reagent 1; and mix 10g of dodecylamine, 10g of morpholine, and 20g of sodium oleate as reagent 2.

[0155] 2) The vanadium-titanium magnetite titanium tailings were added with water to prepare a slurry with a solid content of 50%, ground to 200 mesh with a ball mill, and then water was added to adjust the solid content to 20%. The pH of the slurry was adjusted to 3 with 5% sulfuric acid, and then reagent 1 was added and stirred at room temperature for 2 hours to obtain a primary treated slurry, wherein the mass percentage of reagent 1 in the primary treated slurry was 0.01%.

[0156] 3) Use a pump to send the primary treated slurry into a five-stage series spiral chute for separation, and control the separation time of each stage of the spiral chute to be 10 minutes to obtain the primary separation inner slurry and the primary separation outer slurry, and filter the primary separation inner slurry to obtain the first filter cake.

[0157] 4) The first filter cake is added with water to prepare a slurry with a solid content of 50%, which is then ground to 300 mesh using a ball mill. Water is then added to adjust the solid content to 20%, and the slurry is then pumped into a wet magnetic separator with a magnetic roller having a magnetic flux of 1.6 T to obtain magnetic separation slurry and magnetic residual slurry. The magnetic separation slurry is filtered to obtain a magnetic separation concentrate.

[0158] 5) The pH of the magnetic slurry was adjusted to 10 with 5% sodium hydroxide, and then reagent 2 was added and stirred at room temperature for 2 hours to obtain a secondary treatment slurry, wherein the mass percentage of reagent 2 in the secondary treatment slurry was 0.01%.

[0159] 6) Use a pump to send the secondary treated slurry into a five-stage series spiral chute for separation, and control the separation time of each stage of the spiral chute to 8 minutes to obtain secondary separation inner slurry and secondary separation outer slurry, and filter the secondary separation inner slurry to obtain a second filter cake, and then combine the second filter cake with the magnetic separation concentrate, and dry it at 105°C for 3 hours to obtain titanium concentrate.

[0160] Comparative Example 1

[0161] 1) Prepare 10% hydrochloric acid solution as the acidic substance and 10% sodium hydroxide as the alkaline substance;

[0162] 2) Add water to the vanadium-titanium magnetite titanium tailings to prepare a slurry with a solid content of 50%, grind it to 220 mesh with a ball mill, then add water to adjust the solid content to 15%, adjust the pH of the slurry to 4 with 10% hydrochloric acid, and stir at room temperature for 2 hours to obtain a primary treated slurry.

[0163] 3) Use a pump to send the primary treated slurry into a five-stage series spiral chute for separation, and control the separation time of each stage of the spiral chute to be 10 minutes to obtain the primary separation inner slurry and the primary separation outer slurry, and filter the primary separation inner slurry to obtain the first filter cake.

[0164] 4) The first filter cake is added with water to prepare a slurry with a solid content of 50%, which is then ground to 300 mesh using a ball mill. Water is then added to adjust the solid content to 15%, and the slurry is pumped into a wet magnetic separator with a magnetic roller having a magnetic flux of 0.8 T to obtain magnetic separation slurry and magnetic residual slurry. The magnetic separation slurry is filtered to obtain a magnetic separation concentrate.

[0165] 5) The pH of the magnetic slurry was adjusted to 8 with 10% sodium hydroxide and stirred at room temperature for 2 hours to obtain a secondary treatment slurry.

[0166] 6) Use a pump to send the secondary treated slurry into a four-stage series spiral chute for separation, and control the separation time of each stage of the spiral chute to 8 minutes to obtain secondary separation inner slurry and secondary separation outer slurry, and filter the secondary separation inner slurry to obtain a second filter cake, and then combine the second filter cake with the magnetic separation concentrate, and dry it at 110°C for 3 hours to obtain titanium concentrate.

[0167] Comparative Example 2

[0168] 1) Prepare 10% hydrochloric acid solution as an acidic substance; 10% sodium hydroxide as an alkaline substance; and mix 10g of hexadecylamine and 10g of sodium arachidonic acid as agent 2.

[0169] 2) Add water to the vanadium-titanium magnetite titanium tailings to prepare a slurry with a solid content of 50%, grind it to 220 mesh with a ball mill, then add water to adjust the solid content to 15%, adjust the pH of the slurry to 4 with 10% hydrochloric acid, and stir at room temperature for 2 hours to obtain a primary treated slurry.

[0170] 3) Use a pump to send the primary treated slurry into a five-stage series spiral chute for separation, and control the separation time of each stage of the spiral chute to be 10 minutes to obtain the primary separation inner slurry and the primary separation outer slurry, and filter the primary separation inner slurry to obtain the first filter cake.

[0171] 4) The first filter cake is added with water to prepare a slurry with a solid content of 50%, which is then ground to 300 mesh using a ball mill. Water is then added to adjust the solid content to 15%, and the slurry is pumped into a wet magnetic separator with a magnetic roller having a magnetic flux of 0.8 T to obtain magnetic separation slurry and magnetic residual slurry. The magnetic separation slurry is filtered to obtain a magnetic separation concentrate.

[0172] 5) The pH of the magnetic slurry was adjusted to 8 with 10% sodium hydroxide, and then reagent 2 was added and stirred at room temperature for 2 hours to obtain a secondary treatment slurry, wherein the mass percentage of reagent 2 in the secondary treatment slurry was 0.008%.

[0173] 6) Use a pump to send the secondary treated slurry into a four-stage series spiral chute for separation, and control the separation time of each stage of the spiral chute to 8 minutes to obtain secondary separation inner slurry and secondary separation outer slurry, and filter the secondary separation inner slurry to obtain a second filter cake, and then combine the second filter cake with the magnetic separation concentrate, and dry it at 110°C for 3 hours to obtain titanium concentrate.

[0174] Comparative Example 3

[0175] 1) Prepare 10% hydrochloric acid solution as an acidic substance; 10% sodium hydroxide as an alkaline substance; 10g of ammonium sulfate, 10g of sodium lauryl carboxylate, and 100g of 0.3% polyvinyl pyrrolidone (anionic type, molecular weight 20,000) solution as a mixture as reagent 1.

[0176] 2) The vanadium-titanium magnetite titanium tailings were added with water to prepare a slurry with a solid content of 50%, ground to 220 mesh with a ball mill, and then water was added to adjust the solid content to 15%. The pH of the slurry was adjusted to 4 with 10% hydrochloric acid, and then reagent 1 was added and stirred at room temperature for 2 hours to obtain a primary treated slurry, wherein the mass percentage of reagent 1 in the primary treated slurry was 0.008%.

[0177] 3) Use a pump to send the primary treated slurry into a five-stage series spiral chute for separation, and control the separation time of each stage of the spiral chute to be 10 minutes to obtain the primary separation inner slurry and the primary separation outer slurry, and filter the primary separation inner slurry to obtain the first filter cake.

[0178] 4) The first filter cake is added with water to prepare a slurry with a solid content of 50%, which is then ground to 300 mesh using a ball mill. Water is then added to adjust the solid content to 15%, and the slurry is pumped into a wet magnetic separator with a magnetic roller having a magnetic flux of 0.8 T to obtain magnetic separation slurry and magnetic residual slurry. The magnetic separation slurry is filtered to obtain a magnetic separation concentrate.

[0179] 5) The pH of the magnetic slurry was adjusted to 8 with 10% sodium hydroxide and stirred at room temperature for 2 hours to obtain a secondary treatment slurry.

[0180] 6) Use a pump to send the secondary treated slurry into a four-stage series spiral chute for separation, and control the separation time of each stage of the spiral chute to 8 minutes to obtain secondary separation inner slurry and secondary separation outer slurry, and filter the secondary separation inner slurry to obtain a second filter cake, and then combine the second filter cake with the magnetic separation concentrate, and dry it at 110°C for 3 hours to obtain titanium concentrate.

[0181] The compositions and important parameters of reagent 1 and reagent 2 in the methods for obtaining titanium concentrate in Examples 1-8 and Comparative Examples 1-3 of the present application are shown in Table 1.

[0182] Table 1

[0183]

[0184]

[0185] “-” means that the drug is not available.

[0186] Titanium dioxide content test:

[0187] The titanium dioxide content in the raw ore, titanium concentrate and filter residue in Examples 1-8 and Comparative Examples 1-3 was determined by the method provided in the industry standard YB / T 159.1-2015, i.e., the ammonium ferric sulfate titration method, and the recovery rate of the titanium concentrate was calculated, where the recovery rate of the titanium concentrate = (mass proportion of titanium dioxide in the raw ore - mass proportion of titanium dioxide in the filter residue) / mass proportion of titanium dioxide in the raw ore. The results are shown in Table 2.

[0188] Table 2

[0189]

[0190]

[0191] As can be seen from the above table, the present invention achieves efficient dissociation and separation of titanium-containing minerals and impurity minerals in the vanadium-titanium magnetite titanium tailings system through selective dissolution, complexation, and flocculation. The prepared titanium concentrate meets the titanium concentrate industry standard (TiO2 content ≥ 45%), the titanium content (TiO2) in the filter residue is ≤ 1.92%, and the total recovery rate of the titanium concentrate is ≥ 70%. By comparing Examples 1-5 with Comparative Example 1, it can be seen that the addition of reagents 1 and 2 can selectively adsorb and separate impurity minerals, thereby improving the recovery rate of the titanium concentrate. By comparing Examples 1-5 with Comparative Example 2, it can be obtained that the addition of reagent 1 can selectively adsorb and separate silicon impurity minerals, thereby improving the recovery rate of the titanium concentrate. By comparing Examples 1-5 with Comparative Example 3, it can be obtained that the addition of reagent 2 can selectively adsorb and separate calcium, magnesium, and aluminum impurity minerals, thereby improving the titanium recovery rate. Therefore, the present invention has the outstanding characteristics of high separation efficiency, low cost and short process, provides a new way for the efficient recovery of titanium in vanadium-titanium magnetite titanium tailings, and can promote the large-scale industrial utilization of titanium in vanadium-titanium magnetite titanium tailings.

[0192] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", "some implementation plans" or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0193] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A method for recovering titanium concentrate from titanium tailings of vanadium-titanium magnetite, characterized in that: include: The vanadium-titanium magnetite titanium tailings are ground and mixed with water to form a slurry, and after adjusting the pH value to acidic, mixed with a first agent to react to obtain a primary treatment slurry, wherein the first agent can complex with silicon to form a first complex; removing the first complex from the primary treatment slurry to obtain a first filter cake; Grinding the first filter cake and mixing it with water to form a slurry, magnetically separating the obtained slurry to obtain a magnetic separation slurry and a magnetic residual slurry, and filtering the magnetic separation slurry to obtain a magnetic separation concentrate; After adjusting the pH value of the magnetic slurry to alkaline, the slurry is mixed with a second reagent to react to obtain a secondary treatment slurry, wherein the second reagent can be complexed with calcium, aluminum and magnesium to form a second complex; The second complex is removed from the secondary treatment slurry to obtain a second filter cake, and the second filter cake is combined with the magnetic separation concentrate and dried to obtain titanium concentrate.

2. The method for recovering titanium concentrate from vanadium-titanium magnetite titanium tailings according to claim 1, characterized in that: The mass of the first agent accounts for 0.005%-0.015% of the mass of the primary treatment slurry.

3. The method for recovering titanium concentrate from vanadium-titanium magnetite titanium tailings according to claim 1 or 2, characterized in that: The first agent includes a regulator, a strengthener and a silicon complexing agent.

4. The method for recovering titanium concentrate from vanadium-titanium magnetite titanium tailings according to claim 3, characterized in that: The mass ratio of the regulator, the reinforcing agent and the silicon complexing agent is 1:1:(5-10).

5. The method for recovering titanium concentrate from vanadium-titanium magnetite titanium tailings according to claim 3, characterized in that: The regulator comprises at least one of sodium dodecyl carboxylate, sodium dodecyl sulfonate, sodium dodecylbenzene sulfonate, sodium hexadecyl carboxylate, sodium hexadecyl sulfonate and sodium hexadecylbenzene sulfonate; The strengthening agent includes at least one of ammonium chloride, ammonium sulfate, ammonium phosphate, ammonium acetate, ethylenediaminetetraacetic acid and sodium ethylenediaminetetraacetate; The silicon complexing agent includes at least one of anionic polyacrylamide, polyvinyl pyrrolidone, polyvinyl alcohol and polyethylene glycol.

6. The method for recovering titanium concentrate from titanium tailings of vanadium-titanium magnetite according to claim 5, characterized in that: The molecular weight of the polyvinyl pyrrolidone is 8,000-80,000; The molecular weight of the polyvinyl alcohol is 100,000-200,000; The molecular weight of the polyethylene glycol is 400-8000.

7. The method for recovering titanium concentrate from vanadium-titanium magnetite titanium tailings according to claim 1, characterized in that: The mass of the second reagent accounts for 0.005%-0.015% of the mass of the secondary treatment slurry.

8. The method for recovering titanium concentrate from titanium tailings of vanadium-titanium magnetite according to claim 1 or 7, characterized in that: The second agent includes a calcium complexing agent and a magnesium-aluminum complexing agent.

9. The method for recovering titanium concentrate from titanium tailings of vanadium-titanium magnetite according to claim 8, characterized in that: The calcium complexing agent includes at least one of dodecylamine, hexadecylamine, octadecylamine and morpholine; The magnesium-aluminum complexing agent includes at least one of sodium laurate, sodium oleate, sodium linoleate, sodium linolenate, sodium arachidonic acid, sodium palmitate and sodium stearate.

10. The method for recovering titanium concentrate from titanium tailings obtained from vanadium-titanium magnetite according to any one of claims 1 to 9, characterized in that: The step comprises grinding the vanadium-titanium magnetite titanium tailings and mixing them with water to form a slurry, adjusting the pH value to acidic, and then mixing and reacting with a reagent to obtain a primary treatment slurry, wherein the ground particle size is 180 mesh to 250 mesh; The solid content of the slurry is 15%-40%; pH value is 3-5; The reaction time is 30 min-200 min.

11. The method for recovering titanium concentrate from titanium tailings obtained from vanadium-titanium magnetite according to any one of claims 1 to 9, characterized in that: The step of removing the first complex from the primary treated slurry to obtain a first filter cake includes: separating the primary treated slurry in a spiral chute to obtain a primary separated inner slurry and a primary separated outer slurry, and filtering the primary separated inner slurry to obtain the first filter cake.

12. The method for recovering titanium concentrate from titanium tailings of vanadium-titanium magnetite according to claim 11, characterized in that: The first-processed slurry is separated by a spiral chute to obtain a first-separation inner slurry and a first-separation outer slurry, and the first-separation inner slurry is filtered to obtain a first filter cake. The separation time of the spiral chute is 5 min-12 min; The mass ratio of the first separation inner pulp to the first separation outer pulp is 1:(5-10).

13. The method for recovering titanium concentrate from titanium tailings obtained from vanadium-titanium magnetite according to any one of claims 1 to 9, characterized in that: The first filter cake is ground and mixed with water to form a slurry, the obtained slurry is magnetically separated to obtain a magnetic separation slurry and a magnetic residual slurry, and the magnetic separation slurry is filtered to obtain a magnetic separation concentrate, wherein the magnetic flux of the magnetic separation is 0.4 T to 1.6 T; The particle size of the grinding is 250 mesh-350 mesh; The solid content of the slurry is 15%-40%.

14. The method for recovering titanium concentrate from titanium tailings obtained from vanadium-titanium magnetite according to any one of claims 1 to 9, characterized in that: The step is to adjust the pH value of the magnetic slurry to alkaline, and then mix and react with the second reagent to obtain a secondary treatment slurry with a pH value of 8-10; The reaction time is 30 min-200 min.

15. The method for recovering titanium concentrate from titanium tailings obtained from vanadium-titanium magnetite according to any one of claims 1 to 9, characterized in that: The step of removing the second complex from the secondary treatment slurry to obtain a second filter cake, combining the second filter cake with the magnetic separation concentrate and drying it to obtain the titanium concentrate includes: separating the secondary treatment slurry by a spiral chute to obtain a secondary separation inner pulp and a secondary separation outer pulp, filtering the secondary separation inner pulp to obtain the second filter cake.

16. The method for recovering titanium concentrate from titanium tailings of vanadium-titanium magnetite according to claim 15, characterized in that: The step is to separate the secondary treated slurry in a spiral chute to obtain a secondary separation inner slurry and a secondary separation outer slurry, filter the secondary separation inner slurry to obtain a second filter cake, combine the second filter cake with the magnetic separation concentrate and dry it to obtain titanium concentrate, and the separation time of the spiral chute is 4 min-8 min; The mass ratio of the secondary separation inner pulp to the secondary separation outer pulp is 1:(5-10); The drying temperature is 105℃-110℃.

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