Flotation separation collecting agent for associated phosphorus resources in vanadium titano-magnetite and application of flotation separation collecting agent

Abstract

The invention discloses a flotation separation collecting agent for associated phosphorus resources in vanadium titano-magnetite and application of the flotation separation collecting agent, and relates to the technical field of mineral processing. The flotation separation collecting agent comprises, by mass, 40%-60% of a main collecting agent, 20%-30% of an auxiliary collecting agent, 10%-18% of a foaming agent and 5%-12% of a chelating agent. Wherein the main collecting agent contains a phosphonic acid group. The phosphonic acid group can be selectively adsorbed with Ca < 2 + > on the surface of apatite to form a chelating bond to enhance the collecting selectivity; the ultra-fine particle grade gangue can be selectively flocculated, and the flotation environment is optimized; high dispersity can still be kept at low temperature, and the collecting performance can be enhanced; and all the components are good in water solubility and efficient in collecting performance, so that the dosage of the agent is low, and the investment cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of mineral processing, in particular to a flotation separation collector for associated phosphorus resources in vanadium-titanium magnetite and application thereof. Background Art

[0002] As an important non-metallic mineral resource, apatite has applications in phosphate fertilizer production, fine chemicals, specialty materials, and the defense industry. With the continued mining of high-grade phosphate rock resources worldwide, the reserves of high-quality phosphate rock are decreasing year by year. Recovering phosphorus from low-grade ores and industrial tailings has become an important direction for resource utilization. The tailings produced during the beneficiation of vanadium-titanium magnetite usually contain 0.87%-3.05% P2O5. The comprehensive recovery of this type of associated phosphorus resources can not only alleviate the pressure on the supply of phosphate rock resources, but also effectively solve the land occupation and environmental risks caused by tailings storage. In current industrial practice, flotation is still the mainstream technical route for separating apatite from associated minerals. Its core lies in the development of a collector system with specific selectivity.

[0003] However, the recovery of apatite from vanadium-titanium magnetite tailings faces many technical challenges. Common problems include: apatite is embedded in fine particles, has a complex symbiotic relationship with ilmenite and gangue minerals, and the ore characteristics vary significantly in different regions. The selectivity of apatite flotation collectors is insufficient, making it difficult to achieve efficient separation. For example, traditional collectors such as sodium oleate have little difference in adsorption of calcium-containing gangue minerals such as apatite and calcite, making it difficult to improve the grade of the concentrate. In addition, the solubility and dispersibility of fatty acid collectors are significantly reduced in low-temperature environments, especially in the northern winter when the temperature is low. The performance of the agent is limited, and additional heating or increased dosage is required to maintain the effect, thereby increasing energy consumption and costs.

[0004] The weak capture capacity of fine-grained apatite is also a major problem of the existing technology. The particle size of some apatite in the vanadium-titanium magnetite tailings reaches the micron level. Conventional collectors have low flotation efficiency for these fine-grained minerals, and are prone to over-crushing and ore slime entrainment, resulting in a recovery rate of less than 50%. In addition, existing processes mostly rely on multi-stage flotation and composite reagent combinations. Although they can improve the recovery rate to a certain extent, the reagent consumption is large, the process cost is high, and the economy is poor. The collectors currently used contain a large amount of organic matter and are difficult to degrade, resulting in an increase in the COD content in the water, deterioration of water quality, and poor environmental protection.

[0005] Chinese patent CN110935560A discloses a beneficiation method for recovering phosphorus from vanadium-titanium magnetite tailings with extremely low phosphorus content. By further grinding, sulfur selection, iron selection, titanium selection and strong magnetic separation process, a phosphate concentrate with a P2O5 grade greater than 30% is finally obtained, but the process flow of this method is complicated and the recovery rate is low. Chinese patent CN111871594A discloses a beneficiation process for simultaneously recovering phosphorus and rare earths from vanadium-titanium magnetite. By flotation sulfur selection, weak magnetic iron selection, strong magnetic titanium selection and mixed flotation after desludging, comprehensive recovery of phosphorus and rare earths is achieved, but the process operation is difficult and the process flow is relatively complicated. Chinese patent CN112474065A discloses a method for phosphorus selection from low-grade vanadium-titanium magnetite tailings. By weak magnetic separation and positive flotation phosphorus selection, a phosphate concentrate with a P2O5 grade greater than 35% is obtained, but the recovery rate is only about 70%. Chinese patent CN119076199A discloses a comprehensive utilization method for ultra-depleted vanadium-titanium magnetite tailings. This method can produce a phosphate concentrate with a grade and recovery rate that meet production requirements while simultaneously enriching elements such as Si and Al. However, the recovery rate remains low, leading to resource waste. While this patent improves the recovery rate of phosphorus resources in vanadium-titanium magnetite to a certain extent, it still suffers from issues such as low concentrate grade and insufficient recovery rate.

[0006] In view of this, the present invention is proposed. Summary of the Invention

[0007] The purpose of the present invention is to provide a flotation separation collector for associated phosphorus resources in vanadium-titanium magnetite and its application, so as to solve the above technical problems.

[0008] The present invention is achieved in that: In a first aspect, an embodiment of the present invention provides a flotation separation collector for associated phosphorus resources in vanadium-titanium magnetite. The flotation separation collector comprises the following components by mass percentage: The main collector comprises 40%-60%, an auxiliary collector comprises 20%-30%, a foaming agent comprises 10%-18% and a chelating agent comprises 5%-12%; wherein the main collector is a phosphonic acid derivative.

[0009] In a second aspect, an embodiment of the present invention provides a use of the aforementioned flotation separation collector in the flotation separation of vanadium-titanium magnetite-associated phosphate minerals.

[0010] The present invention has the following beneficial effects: The flotation separation collector for the associated phosphorus resources in vanadium-titanium magnetite provided in the embodiment of the present invention introduces a phosphonic acid group into the molecular structure to selectively bind to the Ca2+ on the surface of apatite. 2+Adsorption, forming a chelate bond, while the main collector and the auxiliary collector form a co-adsorption layer, enhancing the selectivity of the collector; the coordinated action of each component can effectively capture fine-grained apatite, at the same time, the chelate binds to the Ca on the surface of the gangue 2+ The branched structure in the components can selectively flocculate the ultrafine-grained gangue and optimize the flotation environment. The branched structure in the components can also reduce the critical micelle concentration, so that it can still maintain high dispersion at low temperatures, which is conducive to enhancing the collection performance. The components are well soluble in water and are biodegradable materials with good environmental protection, which is conducive to promoting the realization of green mineral processing technology. Its efficient collection performance makes the dosage of reagents low and reduces investment costs. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0012] Figure 1 Schematic diagram of the flotation process of vanadium-titanium magnetite-associated phosphate minerals. DETAILED DESCRIPTION

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

[0014] To address the low grade and recovery of phosphorus concentrate in vanadium-titanium magnetite, this invention provides a modified flotation separation collector with high selectivity, low dosage, and low-temperature resistance. This collector improves the P2O5 grade of the concentrate while also effectively increasing the phosphorus recovery rate. The specific implementation process is as follows: In a first aspect, an embodiment of the present invention provides a flotation separation collector for associated phosphorus resources in vanadium-titanium magnetite. The flotation separation collector comprises the following components by mass percentage: The main collector is 40%-60%, the auxiliary collector is 20%-30%, the foaming agent is 10%-18% and the chelating agent is 5%-12%; among which, the main collector is a phosphonic acid derivative.

[0015] It should be noted that the introduction of phosphonic acid groups into the molecular structure can selectively bind to the Ca 2+Adsorption forms a chelate bond, and the main collector and auxiliary collector form a co-adsorption layer, which enhances the selectivity of the collector. Using this collector, the P2O5 grade of the concentrate can be greater than 30%, and the recovery rate can be greater than 80%.

[0016] The use of the flotation separation collector of the present invention can improve the selectivity of the flotation separation collector in vanadium-titanium magnetite-associated phosphate minerals by 30% and the hard water resistance by 50%.

[0017] In an optional embodiment, the primary collector is selected from at least one of lauryl phosphonate potassium salt, isooctyl phosphonate potassium salt and styrene phosphonic acid.

[0018] In the most preferred embodiment, the primary collector is potassium lauryl phosphonate; in other embodiments of the present invention, other types of primary collectors can be selected according to actual needs.

[0019] It should be noted that potassium lauryl phosphonate can selectively bind to Ca 2+ Adsorption forms chelate bonds, enabling the capture of phosphorus-containing minerals (such as apatite). The long carbon chain of the lauryl group provides sufficient hydrophobicity, while the polar group of the phosphonate maintains water solubility, enabling the flotation separation collector to maintain good dispersibility and capture activity even at low temperatures (e.g., <15°C). Its low toxicity and biodegradability meet the requirements of green flotation processes and help reduce the pressure on wastewater treatment in tailings.

[0020] In an optional embodiment, the auxiliary collector is selected from at least one of fatty alcohol polyoxyethylene ether carboxylate, fatty alcohol polyoxyethylene ether, pine oil and polyoxypropylene ether.

[0021] In the most preferred embodiment, the auxiliary collector is fatty alcohol polyoxyethylene ether carboxylate; in other embodiments of the present invention, other types of auxiliary collectors can be selected according to actual needs.

[0022] It should be noted that fatty alcohol polyoxyethylene ether carboxylate is beneficial to improve the dispersibility of flotation separation collectors at low temperatures. It is a surfactant with both non-ionic (polyoxyethylene ether chain) and anionic (carboxylic acid group) characteristics. The carboxylic acid group dissociates into anions under alkaline conditions and reacts with cations (Ca) on the surface of metal minerals (such as oxide ores and carbonate ores). 2+ 、Fe 3+ 、RE 3+ The polyoxyethylene ether chain provides steric hindrance, which enhances the directional arrangement of the collector on the mineral surface and improves the hydrophobicity.

[0023] Fatty alcohol polyoxyethylene ether carboxylates are more selective than traditional fatty acids (such as oleic acid) and have stronger resistance to hard water. If used excessively, the foam may become too sticky or over-dispersed, reducing the capture efficiency.

[0024] In an optional embodiment, the foaming agent is selected from at least one of polyethylene glycol, sodium carboxymethyl cellulose, methyl isobutyl carbinol, polypropylene glycol ether, sodium fatty acid methyl ester sulfonate and alkyl polyoxyethylene ether.

[0025] In the most preferred embodiment, polyethylene glycol is used as the foaming agent; in other embodiments of the present invention, other types of foaming agents can be selected according to actual needs.

[0026] It should be noted that frothers are surfactants that reduce gas-liquid interfacial tension, promote bubble formation, and stabilize the foam layer. They are typically used in conjunction with collectors to improve the flotation efficiency of mineral particles. Polyethylene glycol, an alcohol-based frother, has a strong bubble formation ability and produces uniform, fine foam, which helps reduce foam entrainment and improves collection efficiency.

[0027] In an optional embodiment, the chelating agent is selected from at least one of citric acid, tartaric acid, sodium gluconate and sodium polyaspartate.

[0028] In the most preferred embodiment, the chelating agent is sodium polyaspartate; in other embodiments of the present invention, other types of chelating agents can be selected according to actual needs.

[0029] It should be noted that the role of sodium polyaspartate in apatite flotation is mainly reflected in its chelating properties. It reacts with Ca on the surface of apatite (Ca5(PO4)3(OH)). 2+ It forms a stable water-soluble complex, strips off its surface active sites, and prevents clay substances from adsorbing apatite, thereby activating apatite. It adjusts the surface chemical properties of minerals by selectively complexing specific metal ions, thereby improving the flotation separation effect. In addition, sodium polyaspartate can also react with Mg in the pulp. 2+ 、Fe 3+ Complexation can reduce its negative impact on the flotation process and improve the collection efficiency.

[0030] The chelating ability of sodium polyaspartate is significantly affected by pH, so the pH value in the flotation process needs to be strictly controlled. In the embodiment of the present invention, the pH value is 6.5-8.5, which can be reasonably adjusted according to actual conditions.

[0031] In an optional embodiment, the flotation separation collector is prepared by the following method: Dissolve the primary collector in a 10-25°C water bath and set aside; The dissolved main collector, auxiliary collector and foaming agent are mixed evenly, and then a chelating agent is added to react to prepare a flotation separation collector; Water is added at the same time as the chelating agent, wherein the amount of water used is 5%-15% of the total mass of the flotation separation collector.

[0032] It should be noted that appropriate heating helps accelerate the dissolution and dispersion of substances. During the mixing process, to accelerate the reaction between the components and make the reaction more thorough, stirring or ultrasound-assisted mixing can be used to increase the mixing speed. For example, stirring at 800-1000 r / min is not particularly limited. The stirring time can be reasonably adjusted according to the actual amount of material being processed to ensure that the components are evenly mixed and there are no particulates or agglomerates in the system.

[0033] Aqueous flotation collectors disperse quickly and evenly throughout the slurry, ensuring uniform coverage of the mineral surface with the agent molecules or colloidal particles, thus avoiding uneven collection caused by localized concentrations being too high or too low. Using dry powders directly can lead to uneven dispersion due to turbulent slurry flow, while using emulsions can be unstable and require the addition of additional emulsifiers, increasing investment costs.

[0034] In a second aspect, an embodiment of the present invention provides a use of the aforementioned flotation separation collector in the flotation separation of vanadium-titanium magnetite-associated phosphate minerals.

[0035] In an optional embodiment, the flotation separation of associated phosphate minerals in vanadium-titanium magnetite adopts a "one coarse, two fine, and one sweep" operation process; the amount of flotation separation collector added to each ton of raw ore is 200g-400g.

[0036] It should be noted that flotation separation adopts the "one roughing, two fines and one sweeping" operation process, which specifically refers to one roughing, two fines and one sweeping. Figure 1 .

[0037] In an optional embodiment, the flotation separation collector is added in stages, wherein in the roughing stage, the amount of flotation separation collector added per ton of raw ore is 120g-300g; in the scavenging stage, the amount of flotation separation collector added per ton of raw ore is 80g-100g.

[0038] It should be noted that adding it during the roughing stage prioritizes the capture of easily floatable minerals, while during the scavenging stage, it primarily targets difficult-to-float minerals (such as intergrown particles or surface-oxidized particles), thus avoiding reagent waste. This helps precisely match differences in mineral floatability, improving recovery and grade; dynamically responds to changes in the flotation environment, enhancing process stability; and optimizing reagent economics, reducing beneficiation costs.

[0039] If too much collector is added at one time, it may lead to: the accidental capture of non-target minerals (such as gangue); the rapid consumption of the collector by easily floatable minerals, and insufficient capture of difficult-to-float minerals.

[0040] In an optional embodiment, the flotation process is not heated; the flotation separation collector of the present invention can still maintain a high dispersion effect in a low-temperature environment. Not heating is beneficial to energy saving and consumption reduction, simplification of the process flow (such as no need for heating equipment), and is conducive to promoting the realization of green mineral processing technology.

[0041] In an optional embodiment, the pH of the flotation process is 6.5-8.5, and the time is 8 min-10 min.

[0042] It should be noted that the pH setting of the flotation process is conducive to the directional regulation of mineral-reagent interactions to achieve selective sorting; balancing the contradiction between recovery rate and grade (for example, high pH increases grade but may reduce recovery rate); and coping with fluctuations in ore properties to ensure process stability.

[0043] In an optional embodiment, the P2O5 content of the flotation ore is 1.8%-3%, and the -0.019 mm particle size accounts for more than 60%; the P2O5 grade of the concentrate obtained by flotation is greater than 30%, and the phosphorus recovery rate is greater than 85%.

[0044] The features and performance of the present invention are further described in detail below with reference to the embodiments.

[0045] Example 1 This embodiment provides a flotation separation collector for associated phosphorus resources in vanadium-titanium magnetite, and the preparation method thereof is as follows: The main collector (potassium lauryl phosphonate) was dispersed and dissolved in a 20°C water bath and set aside.

[0046] The dissolved main collector (potassium lauryl phosphonate), auxiliary collector (fatty alcohol polyoxyethylene ether carboxylate) and foaming agent (polyethylene glycol) were mixed in a ratio of main collector: auxiliary collector: foaming agent: chelating agent = 5:3:1.5:0.5, and after uniform emulsification, a chelating agent (sodium polyaspartate) was added for reaction to prepare a flotation separation collector; It should be noted that, in order to accelerate the reaction between the components and make the reaction more thorough, the mixture was stirred at 800 r / min for 20 min during the mixing process, and the stirring was continued for 10 min after the chelating agent was added.

[0047] Water is added at the same time as the sodium polyaspartate, wherein the amount of water is 10% of the total mass of the flotation separation collector.

[0048] After the finished product cools to room temperature, seal and store away from light.

[0049] This embodiment also provides an application of a flotation separation collector in the flotation separation of vanadium-titanium magnetite associated phosphate minerals. For a specific flotation process, see Figure 1 , Figure 1 The K represents concentrate and the X represents tailings.

[0050] The raw ore in a Panxi mining area has a P2O5 content of 1.8%, a Fe2O3 content of 10.5%, and a particle size of -0.019 mm accounting for more than 60%; Dosage of collector for flotation separation: 300g / t in roughing stage, 100g / t in scavenging stage; Flotation separation results: concentrate P2O5 grade 35.2%, recovery rate 87.5%, concentrate Fe2O3 content 1.61%.

[0051] Example 2 This embodiment provides an application of a flotation separation collector in the flotation separation of vanadium-titanium magnetite and associated phosphate minerals. The only difference between this embodiment and embodiment 1 is that: In the flotation separation collector, the ratio of main collector: auxiliary collector: frother: chelating agent is 3:5:1.5:0.5. For the specific flotation process, please refer to Figure 1 .

[0052] The raw ore in a Panxi mining area has a P2O5 content of 1.8%, a Fe2O3 content of 10.5%, and a particle size of -0.019 mm accounting for more than 60%; Dosage of collector for flotation separation: 300g / t in roughing stage, 100g / t in scavenging stage; Flotation separation results: concentrate P2O5 grade is 30.17%, recovery rate is 80.5%, and the concentrate contains iron Fe2O3 content of 2.01%.

[0053] The decrease in the dosage of the main collector results in a decrease in the collector selectivity and collection performance.

[0054] Example 3 This embodiment provides an application of a flotation separation collector in the flotation separation of vanadium-titanium magnetite and associated phosphate minerals. The only difference between this embodiment and embodiment 1 is that: In the flotation separation collector, the ratio of main collector: auxiliary collector: frother: chelating agent is 5:3:1.5:0.5. The main collector is replaced with sodium oleate. For the specific flotation process, please refer to Figure 1 .

[0055] The raw ore in a Panxi mining area has a P2O5 content of 1.8%, a Fe2O3 content of 10.5%, and a particle size of -0.019 mm accounting for more than 60%; Dosage of collector for flotation separation: 300g / t in roughing stage, 100g / t in scavenging stage; Flotation separation results: concentrate P2O5 grade is 24.22%, recovery rate is 84.67%, and the concentrate contains Fe2O3 content of 1.97%.

[0056] After the main collector was replaced with sodium oleate, the collector selectivity decreased, resulting in unqualified products (qualified products: P2O5 grade ≥30%, Fe2O3 content ≤2%).

[0057] Example 4 This embodiment provides an application of a flotation separation collector in the flotation separation of vanadium-titanium magnetite associated phosphate minerals. The difference between this embodiment and embodiment 1 is only the change in the amount of the collector used in the roughing and scavenging stages. For the specific flotation process, see Figure 1 .

[0058] The raw ore in a Panxi mining area has a P2O5 content of 1.8%, a Fe2O3 content of 10.5%, and a particle size of -0.019 mm accounting for more than 60%; Dosage of collector for flotation separation: 200g / t in roughing stage, 200g / t in scavenging stage; Flotation separation results: concentrate P2O5 grade is 37.26%, recovery rate is 74.11%, and the concentrate contains iron Fe2O3 content of 1.77%.

[0059] When the roughing collector is reduced, the amount of concentrated ore decreases and the quality improves. However, the delayed addition of the collector shortens the mineralization time and reduces the concentrate recovery rate.

[0060] Comparative Example 1 This embodiment provides an application of a flotation separation collector in the flotation separation of vanadium-titanium magnetite associated phosphate minerals. The only difference between this embodiment and embodiment 1 is that the flotation separation collector is changed to a conventional collector, sodium oleate. For the specific flotation process, see Figure 1 .

[0061] The raw ore in a Panxi mining area has a P2O5 content of 1.8%, a Fe2O3 content of 10.5%, and a particle size of -0.019 mm accounting for more than 60%; Dosage of collector for flotation separation: 300g / t in roughing stage, 100g / t in scavenging stage; Flotation separation results: concentrate P2O5 grade is 23.26%, recovery rate is 54.11%, and the concentrate contains 3.69% Fe2O3.

[0062] Conventional collector sodium oleate has poor low temperature resistance, dispersibility and selectivity, and pure sodium oleate has insufficient foaming ability, resulting in serious ore loss during concentration, and the final concentrate grade and recovery rate are not ideal.

[0063] For the convenience of comparison, the results after the flotation process of Example 1 and Comparative Example 1 are summarized, as shown in Table 1.

[0064] Table 1 Summary of flotation separation results

[0065] It can be seen from the data in Table 1 that the phosphorus collector provided by the present invention is superior to the traditional collector sodium oleate in terms of recovery rate, concentrate grade and use conditions (energy consumption).

[0066] In summary, the vanadium-titanium magnetite flotation separation collector provided in the embodiment of the present invention has the following characteristics when used in the flotation separation of vanadium-titanium magnetite and associated phosphate minerals: (1) Good selectivity: The present invention introduces phosphonic acid groups into the molecular structure to selectively react with Ca on the surface of apatite. 2+ Adsorption forms a chelate bond, while the fatty alcohol polyoxyethylene ether carboxylate and lauryl phosphonate potassium salt form a co-adsorption layer, enhancing the selectivity of the collector. Using this collector, the P2O5 grade of the concentrate can be greater than 34%, and the recovery rate can be greater than 85%.

[0067] (2) Wide range of adaptability: The intelligent interconnected structure of the components of the present invention greatly reduces the critical micelle concentration, so that the collector has good dispersibility under the condition of temperature greater than 10°C, and its collection performance is not affected.

[0068] (3) Good capture effect on fine particles: The coordinated action of the components of the present invention can effectively capture fine particle apatite. At the same time, EDTA can react with Ca on the surface of gangue. 2+ 、Fe 3+ Ions are selectively adsorbed, forming hydrophilic flocs. The branched structure within the component selectively flocculates ultra-fine-grained gangue, optimizing the flotation environment. This invention can achieve excellent flotation performance, with concentrate P₂O₅ grades exceeding 30% and recoveries exceeding 80%, even when the -0.019mm particle size accounts for more than 60% of the incoming flotation ore.

[0069] (4) Low reagent dosage and low reagent cost: The flotation separation collector of the present invention has high-efficiency collecting performance. Its reagent dosage is about 200g / t lower than that of conventional collectors such as sodium oleate, and the cost of mineral processing reagents is 70% of the cost of conventional reagents.

[0070] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A flotation separation collector for associated phosphorus resources in vanadium-titanium magnetite, characterized in that: The flotation separation collector comprises the following components by mass percentage: The main collector comprises 40%-60%, an auxiliary collector comprises 20%-30%, a foaming agent comprises 10%-18% and a chelating agent comprises 5%-12%; wherein the main collector is a phosphonic acid derivative.

2. The flotation separation collector according to claim 1, characterized in that The primary collector is selected from at least one of lauryl phosphonate potassium salt, isooctyl phosphonate potassium salt and styrene phosphonic acid.

3. The flotation separation collector according to claim 1, characterized in that The auxiliary collector is selected from at least one of fatty alcohol polyoxyethylene ether carboxylate, fatty alcohol polyoxyethylene ether, pine oil and polyoxypropylene ether.

4. The flotation separation collector according to claim 1, characterized in that The foaming agent is selected from at least one of polyethylene glycol, sodium carboxymethyl cellulose, methyl isobutyl carbinol, polypropylene glycol ether, sodium fatty acid methyl ester sulfonate and alkyl polyoxyethylene ether.

5. The flotation separation collector according to claim 1, characterized in that The chelating agent is selected from at least one of citric acid, tartaric acid, sodium gluconate and sodium polyaspartate.

6. The flotation separation collector according to any one of claims 1 to 5, characterized in that: The flotation separation collector is prepared by the following method: Dissolve the primary collector in a 10-25°C water bath and set aside; The dissolved main collector, auxiliary collector and foaming agent are mixed evenly, and then a chelating agent is added to react to prepare a flotation separation collector; Water is added at the same time as the chelating agent, wherein the amount of water is 5%-15% of the total mass of the flotation separation collector.

7. Use of the flotation separation collector according to any one of claims 1 to 6 in the flotation separation of vanadium-titanium magnetite and associated phosphate minerals.

8. The use according to claim 7, characterized in that The flotation separation of associated phosphate minerals in vanadium-titanium magnetite adopts the "one coarse, two fine and one sweep" operation process; the addition amount of flotation separation collector is 200g / t-400g / t.

9. The use according to claim 8, characterized in that The flotation separation collector is added in stages, wherein in the roughing stage, the amount of flotation separation collector added per ton of raw ore is 120g-300g; in the scavenging stage, the amount of flotation separation collector added per ton of raw ore is 80g-100g; and / or, the flotation process is not heated; And / or, the pH of the flotation process is 6.5-8.5, and the time is 8 min-10 min.

10. The use according to claim 7, characterized in that The P2O5 content of the float ore is 1.8%-3%, and the -0.019mm particle size accounts for more than 60%; The P2O5 grade of the concentrate obtained by flotation is greater than 30%, and the phosphorus recovery rate is greater than 90%.

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