A flotation process for ilmenite intensive recovery and its reagent regime

Abstract

This invention relates to a flotation process and reagent system for enhanced recovery of ilmenite, belonging to the field of mineral flotation separation and comprehensive utilization technology. The flotation process for enhanced recovery of ilmenite specifically includes two stages: S1. Ilmenite direct flotation and S2. Ilmenite reverse flotation. The reagent system for the "roughing and scavenging" stage of S1. Ilmenite direct flotation is as follows: during roughing, sodium carbonate is used as the pH adjuster, lead nitrate as the ilmenite activator, hydroxamic acid as the ilmenite collector, and No. 2 oil as the frother; during scavenging, sodium carbonate is used as the pH adjuster, lead nitrate as the ilmenite activator, hydroxamic acid as the ilmenite collector, and No. 2 oil as the frother. The reagent system for the "roughing and scavenging" stage of S2. Ilmenite reverse flotation is as follows: during roughing, cationic starch is used as the ilmenite depressant, and gemini quaternary ammonium salt as the gangue collector; no reagents are added during scavenging.

Description

Technical Field

[0001] This invention belongs to the field of mineral flotation separation and comprehensive utilization technology, specifically relating to a flotation process and reagent system for enhanced recovery of ilmenite. Background Technology

[0002] The Panzhihua-Xichang region of Sichuan Province contains over 93% of my country's titanium resources, primarily located in basic to ultrabasic rock bodies. Primary ilmenite, a major raw material supplier for my country's titanium industry, is currently primarily mined as rock-type vanadium-titanium magnetite. This type of ilmenite has variable ore properties and complex associated minerals, making it a difficult resource to develop and utilize. Ilmenite beneficiation and recovery in the Panzhihua-Xichang region mainly uses vanadium-titanium magnetite tailings as raw material, employing a "strong magnetic + positive flotation" process. This process can yield titanium concentrate with a TiO2 grade of over 47%, but the recovery rate of ilmenite resources remains low. Currently, the flotation recovery rate in titanium beneficiation workshops is around 75%, indicating significant room for improvement in ilmenite recovery rates during flotation.

[0003] Due to the complex ore properties of vanadium-titanium magnetite in the Panzhihua-Xichang region, the current flotation process faces a series of problems: 1) Ilmenite itself has poor flotation properties and its physicochemical properties are similar to those of the main gangue minerals, resulting in poor selectivity of flotation reagents and difficulty in separating ilmenite; 2) Ilmenite has a high density, which easily leads to flotation settling, affecting the flotation recovery rate. The process often uses a high pulp concentration of nearly 50% to reduce the relative density of ilmenite, but this easily causes severe gangue mineral inclusions during flotation, affecting the grade of ilmenite concentrate; 3) Currently used ilmenite flotation collectors are mostly fatty acids and their compound products, which require a medium-to-strong acidic pulp environment for ilmenite flotation, resulting in high acid consumption, high reagent costs, and easy scaling, affecting the stability of process operation; 4) The flotation process is long, and some titanium beneficiation processes require four to five cleaning processes to achieve qualified titanium concentrate indicators, which is not conducive to ensuring a high ilmenite flotation recovery rate. Numerous technical problems result in low flotation recovery rates and high separation costs for ilmenite, which hinders the efficient recycling and utilization of ilmenite resources. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a flotation process and reagent system for enhanced recovery of ilmenite, which can shorten the flotation process of ilmenite, improve the flotation recovery rate of ilmenite, reduce reagent costs, and achieve efficient recovery of ilmenite.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A flotation process for enhanced recovery of ilmenite includes the following steps:

[0007] S1. Ilmenite Direct Flotation: Ilmenite flotation raw materials are prepared into a slurry, and direct flotation pH adjuster, ilmenite activator, ilmenite collector and frother are added in sequence. After the slurry is fully adjusted, "one roughing and one scavenging" direct flotation is carried out. The flotation froth product obtained is ilmenite rough concentrate, and the product in the scavenging tank is flotation tailings 1.

[0008] S2. The reverse flotation process for ilmenite is as follows: Ilmenite rough concentrate is fed into the reverse flotation process, and reverse flotation ilmenite inhibitor and gangue collector are added in sequence. After the slurry is fully conditioned, "one roughing and one scavenging" reverse flotation is carried out. The product in the roughing cell is the final titanium concentrate, and the flotation froth product is tailings 2.

[0009] In the ilmenite flotation process, the TiO2 grade in the ilmenite flotation feedstock is 16.50-21.50%, and the gangue mineral content in the ilmenite flotation feedstock is 54.00-68.00%, wherein the gangue minerals include pyroxene, feldspar, and chlorite.

[0010] According to the above-mentioned flotation process for enhanced recovery of ilmenite, the reagent system for the "roughing and scavenging" steps in S1. positive flotation of ilmenite is as follows: During roughing, the pH adjuster is sodium carbonate, and the pulp pH is 7.5-8.0; the ilmenite activator is lead nitrate, with a dosage of 300-400 g / t; the ilmenite collector is a hydroxamic acid collector, with a dosage of 1500-2000 g / t; and the frother is No. 2 oil, with a dosage of 30-40 g / t. During scavenging, the pH adjuster is sodium carbonate, and the pulp pH is 7.5-8.0; the ilmenite activator is lead nitrate, with a dosage of 150-200 g / t; the ilmenite collector is a hydroxamic acid collector, with a dosage of 500-700 g / t; and the frother is No. 2 oil, with a dosage of 10-20 g / t.

[0011] According to the above-mentioned flotation process for enhanced recovery of ilmenite, the reagent system for the "roughing and scavenging" steps in S2. ilmenite reverse flotation is as follows: during roughing, the ilmenite inhibitor is cationic starch, with a dosage of 900-1200 g / t; the gangue collector is a geminal quaternary ammonium salt collector, with a dosage of 350-450 g / t; during scavenging, no reagents need to be added.

[0012] In step S1, the ilmenite positive flotation process, the ilmenite collector is at least one of benzohydroxyxamic acid and salicylic acid.

[0013] In step S2, the ilmenite reverse flotation process, the ilmenite inhibitor cationic starch includes at least one of tertiary amine alkyl starch ether and quaternary ammonium starch ether.

[0014] In step S2, the reverse flotation process for ilmenite, the gangue collector, the geminal quaternary ammonium salt, includes at least one of the following: didodecyl quaternary ammonium salt, ditetradecyl quaternary ammonium salt, and their ethylene-modified quaternary ammonium salt products.

[0015] In step S2, the reverse flotation process of ilmenite, adding 100-150 g / t octanol as an auxiliary collector during reverse flotation can improve the flotation effect and reduce the amount of gangue collector used.

[0016] The flotation process described as "one roughing and one scavenging" is a technical term. "Roughing" represents the roughing operation, and "scavenging" represents the scavenging operation. The quantifier indicates the number of operations to be separated. "One roughing and one scavenging" means that the flotation process includes one roughing operation and one scavenging operation.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0018] (1) Ilmenite has poor floatability and high density, making it difficult for it to float. In view of this weakness, the present invention further selectively inhibits ilmenite and prevents it from floating during the beneficiation process. In addition, it selectively enhances the floatability of gangue minerals to increase the floatability difference between them and ilmenite, and then uses reverse flotation to improve the flotation recovery rate of ilmenite.

[0019] (2) The present invention optimizes the selective inhibitors for ilmenite, namely lead nitrate + hydroxamic acid + cationic starch and their dosage, based on the differences in surface properties between ilmenite and gangue minerals. This is reflected in the selective adsorption of lead nitrate + hydroxamic acid on the surface of ilmenite beforehand. The bridging effect of the hydroxamic acid reagent enhances the adsorption capacity of cationic starch on the surface of ilmenite and achieves selective inhibition. At the same time, lead nitrate and hydroxamic acid reagents are good activators and collectors for ilmenite flotation. One-step positive flotation during the pre-selective selective adsorption process can remove some gangue minerals, which helps to improve the pulp environment of subsequent reverse flotation and improve the ilmenite separation index.

[0020] (3) After ilmenite is selectively inhibited, the present invention optimizes the gangue gemini quaternary ammonium salt collector and its dosage based on the difference in surface properties between ilmenite and gangue minerals. This is reflected in the selective adsorption on the surface of gangue minerals, which increases the collecting capacity. Octanol-assisted collector enhances the collecting capacity of gangue by strengthening the adsorption of gemini quaternary ammonium salt to gangue minerals, which can reduce the dosage of gemini quaternary ammonium salt collector. Attached Figure Description

[0021] Figure 1 This is a flotation process flow diagram for enhanced recovery of ilmenite according to the present invention and its embodiments. Detailed Implementation

[0022] To better understand the present invention, the present invention will be described more fully and in detail below with reference to the embodiments and the accompanying drawings, but the scope of protection of the present invention is not limited to the following specific embodiments.

[0023] Example 1

[0024] This embodiment provides a flotation process and reagent system for enhanced recovery of ilmenite. The ilmenite flotation feedstock is taken from a titanium beneficiation plant in the Panxi region, with a TiO2 grade of 16.85% and gangue minerals mainly consisting of pyroxene, feldspar, and small amounts of chlorite and olivine, with a gangue mineral content of 66.68%. The ilmenite is recovered by flotation, specifically including two stages: S1. Ilmenite direct flotation and S2. Ilmenite reverse flotation. The process flow is as follows: Figure 1 As shown:

[0025] S1. The ilmenite direct flotation process is as follows: The ilmenite flotation raw material is prepared into a slurry, and the direct flotation pH adjuster, ilmenite activator, ilmenite collector and frother are added in sequence. After the slurry is fully adjusted, "one roughing and one scavenging" direct flotation is carried out. The flotation froth product obtained is ilmenite rough concentrate, and the product in the scavenging tank is flotation tailings 1.

[0026] The reagent system for the "roughing and scavenging" process of S1. Ilmenite direct flotation is as follows: During roughing, the pH adjuster is sodium carbonate, and the pulp pH is 8.0; the ilmenite activator is lead nitrate, with a dosage of 300 g / t; the ilmenite collector is benzoyl hydroxamic acid, with a dosage of 1500 g / t; and the frother is No. 2 oil, with a dosage of 30 g / t. During scavenging, the pH adjuster is sodium carbonate, and the pulp pH is 8.0; the ilmenite activator is lead nitrate, with a dosage of 150 g / t; the ilmenite collector is benzoyl hydroxamic acid, with a dosage of 500 g / t; and the frother is No. 2 oil, with a dosage of 10 g / t.

[0027] S2. The reverse flotation process of ilmenite is as follows: the ilmenite rough concentrate is fed into the reverse flotation process, and the reverse flotation ilmenite inhibitor and gangue collector are added in sequence. After the slurry is fully adjusted, the "one roughing and one scavenging" reverse flotation is carried out. The product in the roughing cell is the final titanium concentrate, and the reverse flotation froth product is tailings 2.

[0028] The reagent system for the "roughing and scavenging" process of S2. Ilmenite reverse flotation is as follows: During roughing, the ilmenite depressant is tertiary amine alkyl starch ether, with a dosage of 1200 g / t; the gangue collector is ethylene bis(tetradecyl) quaternary ammonium salt, with a dosage of 450 g / t. No reagents are required during scavenging.

[0029] The flotation process yielded a TiO2 grade of 47.52% in the concentrate, with a TiO2 recovery rate of 80.12%.

[0030] Example 2

[0031] This embodiment provides a flotation process and reagent system for enhanced recovery of ilmenite. The ilmenite flotation feedstock is taken from a titanium beneficiation plant in the Panxi region, with a TiO2 grade of 18.06% and gangue minerals mainly consisting of pyroxene, feldspar, chlorite, and a small amount of olivine, with a gangue mineral content of 62.15%. The ilmenite is recovered by flotation, specifically including two stages: S1. Ilmenite direct flotation and S2. Ilmenite reverse flotation.

[0032] S1. The ilmenite direct flotation process is as follows: The ilmenite flotation raw material is prepared into a slurry, and the direct flotation pH adjuster, ilmenite activator, ilmenite collector and frother are added in sequence. After the slurry is fully adjusted, "one roughing and one scavenging" direct flotation is carried out. The flotation froth product obtained is ilmenite rough concentrate, and the product in the scavenging tank is flotation tailings 1.

[0033] The reagent system for the "roughing and scavenging" process of S1. Ilmenite direct flotation is as follows: During roughing, the pH adjuster is sodium carbonate, and the pulp pH is 8.0; the ilmenite activator is lead nitrate, with a dosage of 350 g / t; the ilmenite collector is salicylic acid, with a dosage of 1750 g / t; and the frother is No. 2 oil, with a dosage of 35 g / t. During scavenging, the pH adjuster is sodium carbonate, and the pulp pH is 8.0; the ilmenite activator is lead nitrate, with a dosage of 150 g / t; the ilmenite collector is salicylic acid, with a dosage of 600 g / t; and the frother is No. 2 oil, with a dosage of 15 g / t.

[0034] S2. The reverse flotation process of ilmenite is as follows: the ilmenite rough concentrate is fed into the reverse flotation process, and the reverse flotation ilmenite inhibitor and gangue collector are added in sequence. After the slurry is fully adjusted, the "one roughing and one scavenging" reverse flotation is carried out. The product in the roughing cell is the final titanium concentrate, and the reverse flotation froth product is tailings 2.

[0035] The reagent system for the "roughing and scavenging" process of S2. Ilmenite reverse flotation is as follows: During roughing, the ilmenite depressant is quaternary ammonium starch ether, with a dosage of 1100 g / t; the gangue collector is ethylenedidodecyl quaternary ammonium salt, with a dosage of 420 g / t. No reagents are required during scavenging.

[0036] The flotation process yielded a TiO2 grade of 47.38% and a TiO2 recovery rate of 82.96%.

[0037] Example 3

[0038] This embodiment provides a flotation process and reagent system for enhanced recovery of ilmenite. The ilmenite flotation feedstock is taken from a titanium beneficiation plant in the Panxi region, with a TiO2 grade of 19.37% and gangue minerals mainly consisting of pyroxene, feldspar, chlorite, and a small amount of olivine, with a gangue mineral content of 57.94%. The ilmenite is recovered by flotation, specifically including two stages: S1. Ilmenite direct flotation and S2. Ilmenite reverse flotation.

[0039] S1. The ilmenite direct flotation process is as follows: The ilmenite flotation raw material is prepared into a slurry, and the direct flotation pH adjuster, ilmenite activator, ilmenite collector and frother are added in sequence. After the slurry is fully adjusted, "one roughing and one scavenging" direct flotation is carried out. The flotation froth product obtained is ilmenite rough concentrate, and the product in the scavenging tank is flotation tailings 1.

[0040] The reagent system for the "roughing and scavenging" process of S1. Ilmenite direct flotation is as follows: During roughing, the pH adjuster is sodium carbonate, and the pulp pH is 8.0; the ilmenite activator is lead nitrate, with a dosage of 350 g / t; the ilmenite collector is salicylic acid, with a dosage of 1800 g / t; and the frother is No. 2 oil, with a dosage of 30 g / t. During scavenging, the pH adjuster is sodium carbonate, and the pulp pH is 8.0; the ilmenite activator is lead nitrate, with a dosage of 150 g / t; the ilmenite collector is salicylic acid, with a dosage of 600 g / t; and the frother is No. 2 oil, with a dosage of 15 g / t.

[0041] S2. The reverse flotation process of ilmenite is as follows: the ilmenite rough concentrate is fed into the reverse flotation process, and the reverse flotation ilmenite inhibitor and gangue collector are added in sequence. After the slurry is fully adjusted, the "one roughing and one scavenging" reverse flotation is carried out. The product in the roughing cell is the final titanium concentrate, and the reverse flotation froth product is tailings 2.

[0042] The reagent system for the S2. ilmenite reverse flotation "roughing and scavenging" process is as follows: During roughing, the ilmenite depressant is quaternary ammonium starch ether, with a dosage of 1000 g / t; the gangue collector is didodecyl quaternary ammonium salt, with a dosage of 400 g / t. No reagents are required during scavenging.

[0043] The flotation process yielded a TiO2 grade of 47.64% and a TiO2 recovery rate of 82.07%.

[0044] Example 4

[0045] This embodiment provides a flotation process and reagent system for enhanced recovery of ilmenite. The ilmenite flotation feedstock is taken from a titanium beneficiation plant in the Panxi region, with a TiO2 grade of 20.17% and gangue minerals mainly consisting of pyroxene, feldspar, and chlorite, with a gangue mineral content of 56.24%. The ilmenite is recovered by flotation, specifically including two stages: S1. Ilmenite direct flotation and S2. Ilmenite reverse flotation.

[0046] S1. The ilmenite direct flotation process is as follows: The ilmenite flotation raw material is prepared into a slurry, and the direct flotation pH adjuster, ilmenite activator, ilmenite collector and frother are added in sequence. After the slurry is fully adjusted, "one roughing and one scavenging" direct flotation is carried out. The flotation froth product obtained is ilmenite rough concentrate, and the product in the scavenging tank is flotation tailings 1.

[0047] The reagent system for the "roughing and scavenging" process of S1. Ilmenite direct flotation is as follows: During roughing, the pH adjuster is sodium carbonate, and the pulp pH is 7.5; the ilmenite activator is lead nitrate, with a dosage of 400 g / t; the ilmenite collector is benzoyl hydroxamic acid, with a dosage of 2000 g / t; and the frother is No. 2 oil, with a dosage of 40 g / t. During scavenging, the pH adjuster is sodium carbonate, and the pulp pH is 7.5; the ilmenite activator is lead nitrate, with a dosage of 200 g / t; the ilmenite collector is benzoyl hydroxamic acid, with a dosage of 700 g / t; and the frother is No. 2 oil, with a dosage of 20 g / t.

[0048] S2. The reverse flotation process of ilmenite is as follows: the ilmenite rough concentrate is fed into the reverse flotation process, and the reverse flotation ilmenite inhibitor and gangue collector are added in sequence. After the slurry is fully adjusted, the "one roughing and one scavenging" reverse flotation is carried out. The product in the roughing cell is the final titanium concentrate, and the reverse flotation froth product is tailings 2.

[0049] The reagent system for the "roughing and scavenging" process of S2. Ilmenite reverse flotation is as follows: During roughing, the ilmenite depressant is tertiary amine alkyl starch ether, with a dosage of 900 g / t; the gangue collector is ditetradecyl quaternary ammonium salt, with a dosage of 350 g / t. No reagents are required during scavenging.

[0050] The flotation process yielded a TiO2 grade of 47.83% and a TiO2 recovery rate of 83.45%.

[0051] Example 5

[0052] This embodiment provides a flotation process and reagent system for enhanced recovery of ilmenite. The ilmenite flotation feedstock is taken from a titanium beneficiation plant in the Panxi region, with a TiO2 grade of 20.96% and gangue minerals mainly consisting of pyroxene, feldspar, and a small amount of chlorite, with a gangue mineral content of 55.32%. The ilmenite is recovered by flotation, specifically including two stages: S1. Ilmenite direct flotation and S2. Ilmenite reverse flotation.

[0053] S1. The ilmenite direct flotation process is as follows: The ilmenite flotation raw material is prepared into a slurry, and the direct flotation pH adjuster, ilmenite activator, ilmenite collector and frother are added in sequence. After the slurry is fully adjusted, "one roughing and one scavenging" direct flotation is carried out. The flotation froth product obtained is ilmenite rough concentrate, and the product in the scavenging tank is flotation tailings 1.

[0054] The reagent system for the "roughing and scavenging" process of S1. Ilmenite direct flotation is as follows: During roughing, the pH adjuster is sodium carbonate, and the pulp pH is 7.5; the ilmenite activator is lead nitrate, with a dosage of 400 g / t; the ilmenite collector is benzoyl hydroxamic acid, with a dosage of 1900 g / t; and the frother is No. 2 oil, with a dosage of 40 g / t. During scavenging, the pH adjuster is sodium carbonate, and the pulp pH is 7.5; the ilmenite activator is lead nitrate, with a dosage of 200 g / t; the ilmenite collector is benzoyl hydroxamic acid, with a dosage of 700 g / t; and the frother is No. 2 oil, with a dosage of 20 g / t.

[0055] S2. The reverse flotation process of ilmenite is as follows: the ilmenite rough concentrate is fed into the reverse flotation process, and the reverse flotation ilmenite inhibitor and gangue collector are added in sequence. After the slurry is fully adjusted, the "one roughing and one scavenging" reverse flotation is carried out. The product in the roughing cell is the final titanium concentrate, and the reverse flotation froth product is tailings 2.

[0056] The reagent regime for the "roughing and scavenging" process of S2. Ilmenite reverse flotation is as follows: During roughing, the ilmenite depressant is tertiary amine alkyl starch ether at a dosage of 1000 g / t; the gangue collector is ditetradecyl quaternary ammonium salt at a dosage of 200 g / t; and the auxiliary collector is octanol at a dosage of 150 g / t. No reagents are required during scavenging.

[0057] The flotation process yielded a TiO2 grade of 47.75% and a TiO2 recovery rate of 84.06%.

[0058] Example 6

[0059] This embodiment provides a flotation process and reagent system for enhanced recovery of ilmenite. The ilmenite flotation feedstock is taken from a titanium beneficiation plant in the Panxi region, with a TiO2 grade of 21.43% and gangue minerals mainly consisting of pyroxene, feldspar, and a small amount of chlorite, with a gangue mineral content of 54.56%. The ilmenite is recovered by flotation, specifically including two stages: S1. Ilmenite direct flotation and S2. Ilmenite reverse flotation.

[0060] S1. The ilmenite direct flotation process is as follows: The ilmenite flotation raw material is prepared into a slurry, and the direct flotation pH adjuster, ilmenite activator, ilmenite collector and frother are added in sequence. After the slurry is fully adjusted, "one roughing and one scavenging" direct flotation is carried out. The flotation froth product obtained is ilmenite rough concentrate, and the product in the scavenging tank is flotation tailings 1.

[0061] The reagent system for the "roughing and scavenging" process of S1. Ilmenite direct flotation is as follows: During roughing, the pH adjuster is sodium carbonate, and the pulp pH is 8.0; the ilmenite activator is lead nitrate, with a dosage of 350 g / t; the ilmenite collector is salicylic acid, with a dosage of 2000 g / t; and the frother is No. 2 oil, with a dosage of 30 g / t. During scavenging, the pH adjuster is sodium carbonate, and the pulp pH is 7.5; the ilmenite activator is lead nitrate, with a dosage of 150 g / t; the ilmenite collector is salicylic acid, with a dosage of 600 g / t; and the frother is No. 2 oil, with a dosage of 15 g / t.

[0062] S2. The reverse flotation process of ilmenite is as follows: the ilmenite rough concentrate is fed into the reverse flotation process, and the reverse flotation ilmenite inhibitor and gangue collector are added in sequence. After the slurry is fully adjusted, the "one roughing and one scavenging" reverse flotation is carried out. The product in the roughing cell is the final titanium concentrate, and the reverse flotation froth product is tailings 2.

[0063] The reagent regime for the "roughing and scavenging" process of S2. Ilmenite reverse flotation is as follows: During roughing, the ilmenite depressant is quaternary ammonium starch ether at a dosage of 1000 g / t; the gangue collector is ethyleneditetradecyl quaternary ammonium salt at a dosage of 200 g / t; and the auxiliary collector is octanol at a dosage of 100 g / t. No reagents are required during scavenging.

[0064] The flotation process yielded a TiO2 grade of 47.67% and a TiO2 recovery rate of 84.65%.

Claims

1. A flotation process for enhanced recovery of ilmenite, characterized in that, The process includes the following steps: S1. Ilmenite Direct Flotation: Ilmenite flotation raw materials are prepared into a slurry, and direct flotation pH adjuster, ilmenite activator, ilmenite collector and frother are added in sequence. After the slurry is fully adjusted, "one roughing and one scavenging" direct flotation is carried out. The flotation froth product obtained is ilmenite rough concentrate, and the product in the scavenging tank is flotation tailings 1. S2. The reverse flotation process of ilmenite is as follows: the ilmenite rough concentrate is fed into the reverse flotation process, and the reverse flotation ilmenite inhibitor and gangue collector are added in sequence. After the slurry is fully adjusted, the "one roughing and one scavenging" reverse flotation is carried out. The product in the roughing cell is the final titanium concentrate, and the reverse flotation froth product is tailings 2. The reagent system for the "roughing and scavenging" process in the S1. positive flotation of ilmenite is as follows: During roughing, the pH adjuster is sodium carbonate, and the pulp pH is 7.5-8.0; the ilmenite activator is lead nitrate, with a dosage of 300-400 g / t; the ilmenite collector is a hydroxamic acid collector, with a dosage of 1500-2000 g / t; and the frother is No. 2 oil, with a dosage of 30-40 g / t. During scavenging, the pH adjuster is sodium carbonate, and the pulp pH is 7.5-8.0; the ilmenite activator is lead nitrate, with a dosage of 150-200 g / t; the ilmenite collector is a hydroxamic acid collector, with a dosage of 500-700 g / t; and the frother is No. 2 oil, with a dosage of 10-20 g / t. The reagent system for the "one roughing and one scavenging" process in S2. Ilmenite reverse flotation is as follows: During roughing, the ilmenite inhibitor is cationic starch, with a dosage of 900~1200g / t; the gangue collector is a geminal quaternary ammonium salt collector, with a dosage of 350~450g / t; during scavenging, no reagents need to be added. In the S1. ilmenite positive flotation process, the ilmenite collector is at least one of benzohydroxyxamic acid and salicylic acid.

2. The flotation process for enhanced recovery of ilmenite according to claim 1, characterized in that, The TiO2 grade in the ilmenite flotation feedstock is 16.50~21.50%, and the gangue mineral content in the ilmenite flotation feedstock is 54.00~68.00%, including pyroxene, feldspar, and chlorite.

3. The flotation process for enhanced recovery of ilmenite according to claim 1, characterized in that, In the S2. ilmenite reverse flotation process, the ilmenite inhibitor cationic starch includes at least one of tertiary amine alkyl starch ether and quaternary ammonium starch ether.

4. The flotation process for enhanced recovery of ilmenite according to claim 1, characterized in that, In the S2. ilmenite reverse flotation process, the gangue collector, Gemini quaternary ammonium salt, includes at least one of bis(dodecyl) quaternary ammonium salt, bis(tetradecyl) quaternary ammonium salt, and their ethylene-modified quaternary ammonium salt products.

5. The flotation process for enhanced recovery of ilmenite according to claim 1, characterized in that, In the S2. Ilmenite reverse flotation process, 100~150g / t octanol is added as an auxiliary collector during reverse flotation.

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