Use of a garnet flotation depressant

Abstract

The application discloses a kind of garnet selective inhibitor hydrolyzed polymaleic anhydride (HPMA), belongs to mineral flotation technical field.The application is under the rutile and garnet flotation separation system that collector is sodium oleate (NaOL), by adding HPMA, make it selectively adsorbed on the surface of garnet to realize the effective inhibition of garnet, and almost no influence on rutile flotation, can significantly expand the floatability difference between rutile and garnet, and then realize the efficient separation of the two, show excellent selective inhibition performance.Hydrolyzed polymaleic anhydride of the inhibitor of the application has the advantages of small dosage, strong selectivity, easy to dissolve in water, non-toxic, no pollution, etc., can effectively realize the flotation separation of rutile and garnet, and has wide application prospect.

Description

Technical Field

[0001] This invention relates to the field of mineral flotation technology, specifically to the application of a garnet flotation inhibitor. Background Technology

[0002] Titanium metal, due to its excellent properties such as low density, high specific strength, high temperature resistance, and resistance to acid and alkali corrosion, is indispensable in high-end equipment manufacturing, refractory materials, and the ceramics industry. Rutile (TiO2), as a high-quality mineral with high titanium content and few impurities, is a core raw material for the preparation of high-end titanium dioxide and metallic titanium, and has significant strategic value. my country's rutile resources are mainly eclogite-type primary deposits, accounting for 86% of the country's total reserves. However, these ores generally suffer from low grade, fine grain size, and complex mineral composition. Garnet, as the main gangue mineral, is highly similar to rutile in physical properties and surface interface characteristics, making their separation extremely difficult.

[0003] Currently, flotation is the mainstream technology for separating rutile and garnet, and its core lies in controlling the differences in mineral floatability through depressants. Existing depressants are mainly divided into two categories: inorganic depressants and organic depressants.

[0004] Inorganic inhibitors are represented by sodium fluorosilicate (Na₂SiF₆), sodium hexametaphosphate ((NaPO₃)₆), and sodium sulfite (Na₂SO₃). Sodium fluorosilicate exhibits significant inhibitory effects on garnet under acidic conditions, but it is toxic, has a narrow optimal pH range (5-6), and excessive addition can easily inhibit rutile. Sodium hexametaphosphate inhibits garnet by reacting with Fe on the garnet surface. 2+ It forms hydrophilic complexes through chemical bonding and exerts its effect, but excessive use can lead to excessive dispersion of the slurry and has a certain inhibitory effect on rutile; sodium sulfite has poor chemical stability and is easily oxidized and degraded, and its effect is better only in the pH range of 6-8.

[0005] The main organic inhibitor is sodium carboxymethyl cellulose. Sodium carboxymethyl cellulose has good biodegradability, but poor water solubility and susceptibility to mineral slime, which limits its industrial application.

[0006] Because rutile and garnet have similar chemical properties at their surface active sites, conventional collectors often lack selectivity and are difficult to separate efficiently. Therefore, inhibitors are needed to amplify the difference in floatability.

[0007] Currently, research on garnet inhibition mainly relies on inorganic inhibitors. However, these reagents generally suffer from inherent drawbacks such as high environmental impact and ecological risk. Under the trend of green and environmentally friendly industry development, organic inhibitors have gradually become the mainstream research in mineral processing reagents. However, the application of organic inhibitors in rutile and garnet flotation systems is still insufficient, and the organic inhibitors already studied also suffer from poor water solubility and insufficient stability. Therefore, developing a novel garnet inhibitor that is stable, highly selective, adaptable, and environmentally friendly is particularly important for the flotation separation of rutile and garnet. Summary of the Invention

[0008] The purpose of this invention is to provide an organic inhibitor for garnet flotation, so as to solve the problems of selectivity, adaptability and environmental friendliness of garnet inhibitors.

[0009] To achieve the above objectives, the present invention provides the following technical solution: an application of a garnet flotation inhibitor, comprising the following steps:

[0010] Step 1: Mineral Sample Pretreatment

[0011] Rutile and garnet minerals were selected, mixed, and crushed to a particle size of <0.841mm using a jaw crusher. They were then ground in a ball mill for 5 minutes and screened through a vibrating screen for 10 minutes to obtain a particle size of -0.074 to +0.038mm as flotation raw material.

[0012] Step 2: Slurry preparation and pH adjustment

[0013] For single mineral flotation, weigh 2g of pure mineral, add it to the XFD type flotation machine, add 40mL of ultrapure water, turn on the flotation machine and stir for 3 minutes to make the pulp evenly dispersed; then adjust the pH of the pulp to 5.0-9.0 with 0.1mol / L hydrochloric acid or 0.1mol / L sodium hydroxide for 3 minutes.

[0014] Step 3: Adding Inhibitors

[0015] Add hydrolyzed polymaleic anhydride, i.e. HPMA inhibitor, to the slurry. The dosage of single mineral flotation inhibitor is 15-35 mg / L, and the dosage of mixed mineral flotation inhibitor is 0-15 mg / L, based on the slurry mass. Continue stirring for 3 minutes to ensure that HPMA molecules are in full contact with the mineral surface.

[0016] Step 4: Adding the collector

[0017] Add sodium oleate, i.e. NaOL collector, to the slurry. The amount of collector used for single mineral flotation is 60 mg / L, and the amount of collector used for mixed mineral flotation is 80 mg / L. Based on the mass of the slurry, continue stirring for 3 minutes.

[0018] Step 5: Foam Flotation

[0019] Maintain the flotation machine speed at 1700 r / min, keep the aeration rate at 100 ml / min, scrape the foam for 3 minutes, and collect the foam product as concentrate. The slurry at the bottom of the flotation cell is the suppressed tailings.

[0020] Step Six: Processing of Flotation Products

[0021] The flotation froth product is dried to obtain flotation concentrate; the product in the flotation tank is dried to obtain flotation tailings.

[0022] Preferably, in step one, the rutile mineral TiO2 content is ≥94%, sourced from Madagascar, and the garnet mineral Fe2O3 content is ≥38%, sourced from Rwanda.

[0023] Preferably, in step two, when making mixed ore, 1g of rutile and 1g of garnet are weighed out, and the flotation effect is best when the pH of the slurry is adjusted to 8 with sodium hydroxide.

[0024] Preferably, in step three, the optimal dosage of the single-mineral flotation inhibitor is 25 mg / L; the optimal dosage of the mixed-mineral flotation inhibitor is 5 mg / L.

[0025] Preferably, the single mineral flotation result is 2g each of rutile and garnet, at pH=8 and collector dosage of 60mg / L:

[0026] When the inhibitor HPMA was used at a concentration of 15 mg / L, the recovery rate of rutile was 89.98%, and the recovery rate of garnet was 41.31%.

[0027] When the inhibitor HPMA was used at a concentration of 20 mg / L, the recovery rate of rutile was 85.46%, and the recovery rate of garnet was 27.20%.

[0028] When the inhibitor HPMA was used at a concentration of 25 mg / L, the recovery rate of rutile was 85.66%, and the recovery rate of garnet was 7.96% (optimal).

[0029] When the inhibitor HPMA was used at a concentration of 30 mg / L, the recovery rate of rutile was 72.01%, and the recovery rate of garnet was 2.65%.

[0030] When the inhibitor HPMA was used at a concentration of 35 mg / L, the recovery rate of rutile was 50.44% and the recovery rate of garnet was 5.26%.

[0031] Preferably, the flotation result of the mixed ore, with 1g of rutile and 1g of garnet mixed at pH=8 and a collector dosage of 80mg / L:

[0032] When the inhibitor HPMA dosage was 0 mg / L, the TiO2 grade in the rutile flotation concentrate was 57.14%, and the recovery rate was 91.43%.

[0033] When the inhibitor HPMA was used at a concentration of 2 mg / L, the TiO2 grade in the rutile flotation concentrate was 88.81%, and the recovery rate was 94.41%.

[0034] When the inhibitor HPMA dosage is 5 mg / L, the TiO2 grade in the rutile flotation concentrate is 95.90%, and the recovery rate is 92.14% (optimal).

[0035] When the inhibitor HPMA was used at a concentration of 10 mg / L, the TiO2 grade in the rutile flotation concentrate was 94.71%, and the recovery rate was 92.34%.

[0036] When the inhibitor HPMA was used at a concentration of 15 mg / L, the TiO2 grade in the rutile flotation concentrate was 92.20%, and the recovery rate was 87.61%.

[0037] Compared with the prior art, the beneficial effects of the present invention are:

[0038] 1. This invention provides a hydrolytic polymaleic anhydride (HPMA) inhibitor for garnet in a rutile and garnet separation system with excellent selective inhibition. This inhibitor selectively adsorbs onto the garnet surface, thus inhibiting its flotation, while having almost no impact on rutile flotation, exhibiting excellent selectivity. In single-mineral flotation (pH=8, NaOL collector dosage 60 mg / L), with HPMA dosage of 25 mg / L, the rutile recovery rate remains at 85.66%, while the garnet recovery rate is only 7.96%, a difference of 77.7%. In mixed-mineral flotation (pH=8, NaOL collector dosage 80 mg / L), with HPMA dosage of 5 mg / L, compared to the case without inhibitor, the TiO2 grade in the rutile flotation concentrate increases from 57.14% to 95.90%, while the concentrate recovery rate remains above 90%. This fully demonstrates its excellent selectivity performance.

[0039] 2. The high-efficiency organic inhibitor HPMA provided by this invention, compared with conventional inorganic garnet inhibitors, including sodium fluorosilicate, has the advantages of high efficiency, environmental friendliness, no pollution, direct effect, and small dosage; compared with organic inhibitors such as carboxymethyl cellulose, it has advantages such as good solubility and stable effect. The optimal dosage of HPMA inhibitor in single mineral flotation is 25 mg / L, while in mixed mineral flotation, only 5 mg / L is needed to achieve separation, fully demonstrating the high inhibitory performance under low dosage conditions. Furthermore, HPMA can be dissolved in water at room temperature and its effect is stable. Attached Figure Description

[0040] Figure 1 This is a molecular structure diagram of the hydrolyzed polymaleic anhydride of the present invention;

[0041] Figure 2 This is a flotation process flow diagram of the present invention. Detailed Implementation

[0042] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0043] The rutile ore was sourced from Madagascar, Africa, and the garnet ore from Rwanda, Africa. Multi-element analysis of the rutile and garnet ore was performed using X-ray fluorescence spectroscopy. The main components of rutile, by mass percentage, were: TiO2 94.79%, Al2O3 1.54%, Fe2O3 1.38%, Nb2O5 1.28%, with the remainder being impurities. The main components of garnet, by mass percentage, were: Fe2O3 38.80%, SiO2 31.80%, Al2O3 18.94%, CaO 5.01%, MgO 2.10%, TiO2 1.63%, with the remainder being impurities.

[0044] In this embodiment, the sodium oleate aqueous solution of the collector is prepared as follows: Weigh 0.4g of sodium oleate solid, place it in a 100mL beaker, add a small amount of deionized water, place it in a water bath at 50-60℃, stir until the sodium oleate solid powder of the collector is completely dissolved, transfer it to a 100mL volumetric flask, and a 4g / L sodium oleate aqueous solution of the collector can be obtained.

[0045] In this embodiment, the preparation method of the inhibitor hydrolyzed polymaleic anhydride aqueous solution is as follows: Weigh 0.8g of hydrolyzed polymaleic anhydride (50% in water) solution into a 100mL beaker, add a small amount of deionized water and stir to mix evenly, then transfer it to a 100mL volumetric flask to obtain a 4g / L inhibitor hydrolyzed polymaleic anhydride aqueous solution.

[0046] Example 1

[0047] The process flow diagram is shown below. Figure 2 The specific operation process includes the following:

[0048] Step 1: Prepare the paste

[0049] Weigh 1g of pure rutile ore and 1g of pure garnet ore and place them in an XFG single-cell flotation machine. Adjust the speed of the XFG single-cell flotation machine to 1700rpm, add 40ml of deionized water and stir to mix evenly. Adjust the slurry for 3min.

[0050] Step 2: Adjust pH

[0051] At room temperature, add pH adjustment agent solution to the slurry to adjust the pH value to 8, stir and mix evenly at a stirring speed of 1700 rpm for 3 min;

[0052] Step 3: Adding Inhibitors

[0053] Add hydrolyzed polymaleic anhydride (HPMA) inhibitor to the slurry at a dosage of 2 mg / L (based on the mass of the slurry), and continue stirring for 3 minutes to ensure that the HPMA molecules are in full contact with the mineral surface.

[0054] Step 4: Adding the collector

[0055] Add sodium oleate (NaOL) collector to the slurry at a concentration of 80 mg / L (based on the mass of the slurry), and continue stirring for 3 minutes.

[0056] Step 5: Foam Flotation

[0057] Maintain the flotation machine speed at 1700 r / min and the aeration rate at 100 ml / min. Scrape the foam for 3 minutes and collect the foam product as concentrate. The slurry at the bottom of the flotation cell is the suppressed tailings.

[0058] Step 6: Processing of Flotation Products

[0059] The flotation froth product is dried in a forced-air drying oven to obtain flotation concentrate; the product in the tank is vacuum-dried at low temperature to obtain flotation tailings; the oven temperature is controlled at 60℃. The flotation concentrate and tailings are dried and weighed separately, and then the grade is analyzed and the product indicators are calculated.

[0060] In this embodiment, the TiO2 grade in the rutile flotation concentrate obtained by flotation is 88.81%, and the recovery rate is 94.41%.

[0061] Example 2

[0062] The process flow diagram is shown below. Figure 2 The specific operation process includes the following:

[0063] Step 1: Prepare the paste

[0064] Weigh 1g of pure rutile ore and 1g of pure garnet ore and place them in an XFG single-cell flotation machine. Adjust the speed of the XFG single-cell flotation machine to 1700rpm, add 40ml of deionized water and stir to mix evenly. Adjust the slurry for 3min.

[0065] Step 2: Adjust pH

[0066] At room temperature, add pH adjustment agent solution to the slurry to adjust the pH value to 8, stir and mix evenly at a stirring speed of 1700 rpm for 3 min;

[0067] Step 3: Adding Inhibitors

[0068] Add hydrolyzed polymaleic anhydride (HPMA) inhibitor to the slurry at a dosage of 5 mg / L (based on the mass of the slurry), and continue stirring for 3 minutes to ensure that the HPMA molecules are in full contact with the mineral surface.

[0069] Step 4: Adding the collector

[0070] Add sodium oleate (NaOL) collector to the slurry at a concentration of 80 mg / L (based on the mass of the slurry), and continue stirring for 3 minutes.

[0071] Step 5: Foam Flotation

[0072] Maintain the flotation machine speed at 1700 r / min and the aeration rate at 100 ml / min. Scrape the foam for 3 minutes and collect the foam product as concentrate. The slurry at the bottom of the flotation cell is the suppressed tailings.

[0073] Step 6: Processing of Flotation Products

[0074] The flotation froth product is dried in a forced-air drying oven to obtain flotation concentrate; the product in the tank is vacuum-dried at low temperature to obtain flotation tailings; the oven temperature is controlled at 60℃. The flotation concentrate and tailings are dried and weighed separately, and then the grade is analyzed and the product indicators are calculated.

[0075] In this embodiment, the TiO2 grade in the rutile flotation concentrate obtained by flotation is 95.90%, and the recovery rate is 92.14%.

[0076] Example 3

[0077] The process flow diagram is shown below. Figure 2 The specific operation process includes the following:

[0078] Step 1: Prepare the paste

[0079] Weigh 1g of pure rutile ore and 1g of pure garnet ore and place them in an XFG single-cell flotation machine. Adjust the speed of the XFG single-cell flotation machine to 1700rpm, add 40ml of deionized water and stir to mix evenly. Adjust the slurry for 3min.

[0080] Step 2: Adjust pH

[0081] At room temperature, add pH adjustment agent solution to the slurry to adjust the pH value to 8, stir and mix evenly at a stirring speed of 1700 rpm for 3 min;

[0082] Step 3: Adding Inhibitors

[0083] Add hydrolyzed polymaleic anhydride (HPMA) inhibitor to the slurry at a dosage of 10 mg / L (based on the mass of the slurry), and continue stirring for 3 minutes to ensure that the HPMA molecules are in full contact with the mineral surface.

[0084] Step 4: Adding the collector

[0085] Add sodium oleate (NaOL) collector to the slurry at a concentration of 80 mg / L (based on the mass of the slurry), and continue stirring for 3 minutes.

[0086] Step 5: Foam Flotation

[0087] Maintain the flotation machine speed at 1700 r / min and the aeration rate at 100 ml / min. Scrape the foam for 3 minutes and collect the foam product as concentrate. The slurry at the bottom of the flotation cell is the suppressed tailings.

[0088] Step 6: Processing of Flotation Products

[0089] The flotation froth product is dried in a forced-air drying oven to obtain flotation concentrate; the product in the tank is vacuum-dried at low temperature to obtain flotation tailings; the oven temperature is controlled at 60℃. The flotation concentrate and tailings are dried and weighed separately, and then the grade is analyzed and the product indicators are calculated.

[0090] In this embodiment, the TiO2 grade in the rutile flotation concentrate obtained by flotation is 94.71%, and the recovery rate is 92.34%.

[0091] Example 4

[0092] The process flow diagram is shown below. Figure 2 The specific operation process includes the following:

[0093] Step 1: Prepare the paste

[0094] Weigh 1g of pure rutile ore and 1g of pure garnet ore and place them in an XFG single-cell flotation machine. Adjust the speed of the XFG single-cell flotation machine to 1700rpm, add 40ml of deionized water and stir to mix evenly. Adjust the slurry for 3min.

[0095] Step 2: Adjust pH

[0096] At room temperature, add pH adjustment agent solution to the slurry to adjust the pH value to 8, stir and mix evenly at a stirring speed of 1700 rpm for 3 min;

[0097] Step 3: Adding Inhibitors

[0098] Add hydrolyzed polymaleic anhydride (HPMA) inhibitor to the slurry at a dosage of 15 mg / L (based on the mass of the slurry), and continue stirring for 3 minutes to ensure that the HPMA molecules are in full contact with the mineral surface.

[0099] Step 4: Adding the collector

[0100] Add sodium oleate (NaOL) collector to the slurry at a concentration of 80 mg / L (based on the mass of the slurry), and continue stirring for 3 minutes.

[0101] Step 5: Foam Flotation

[0102] Maintain the flotation machine speed at 1700 r / min and the aeration rate at 100 ml / min. Scrape the foam for 3 minutes and collect the foam product as concentrate. The slurry at the bottom of the flotation cell is the suppressed tailings.

[0103] Step 6: Processing of Flotation Products

[0104] The flotation froth product is dried in a forced-air drying oven to obtain flotation concentrate; the product in the tank is vacuum-dried at low temperature to obtain flotation tailings; the oven temperature is controlled at 60℃. The flotation concentrate and tailings are dried and weighed separately, and then the grade is analyzed and the product indicators are calculated.

[0105] In this embodiment, the TiO2 grade in the rutile flotation concentrate obtained by flotation is 92.20%, and the recovery rate is 87.61%.

[0106] In summary, this invention provides a garnet depressant, hydrolyzed polymaleic anhydride (HPMA), with excellent selective inhibition in a rutile and garnet separation system. This depressant selectively adsorbs onto the garnet surface, thus inhibiting its flotation, while having almost no impact on rutile flotation, exhibiting excellent selectivity. In single-mineral flotation (pH=8, NaOL collector dosage 60 mg / L), with HPMA dosage of 25 mg / L, the rutile recovery rate remained at 85.66%, while the garnet recovery rate was only 7.96%, a difference of 77.7%. In mixed-mineral flotation (pH=8, NaOL collector dosage 80 mg / L), with HPMA dosage of 5 mg / L, compared to the case without depressant, the TiO2 grade in the rutile flotation concentrate increased from 57.14% to 95.90%, while the concentrate recovery rate remained above 90%. This fully demonstrates its excellent selectivity performance.

[0107] The provided high-efficiency organic depressant HPMA, compared to conventional inorganic garnet depressants, including sodium fluorosilicate, offers advantages such as high efficiency, environmental friendliness, no pollution, direct action, and low dosage. Compared to organic depressants like carboxymethyl cellulose, it boasts superior solubility and stable efficacy. The optimal dosage of HPMA in single-mineral flotation is 25 mg / L, while in mixed-mineral flotation, a dosage of only 5 mg / L is sufficient to achieve separation, fully demonstrating its high depressant efficiency under low-dosage conditions. Furthermore, HPMA dissolves in water at room temperature and exhibits stable efficacy.

[0108] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0109] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. The application of a garnet flotation inhibitor, characterized in that: Includes the following steps: Step 1: Mineral Sample Pretreatment Rutile and garnet minerals were selected, mixed, and crushed to a particle size of <0.841mm using a jaw crusher. They were then ground in a ball mill for 5 minutes and screened through a vibrating screen for 10 minutes to obtain a particle size of -0.074 to +0.038mm as flotation raw material. Step 2: Slurry preparation and pH adjustment For single mineral flotation, weigh 2g of pure mineral, add it to the XFD type flotation machine, add 40mL of ultrapure water, turn on the flotation machine and stir for 3 minutes to make the pulp evenly dispersed; then adjust the pH of the pulp to 5.0-9.0 with 0.1mol / L hydrochloric acid or 0.1mol / L sodium hydroxide for 3 minutes. Step 3: Adding Inhibitors Add hydrolyzed polymaleic anhydride, i.e. HPMA inhibitor, to the slurry. The dosage of single mineral flotation inhibitor is 15-35 mg / L, and the dosage of mixed mineral flotation inhibitor is 0-15 mg / L, based on the slurry mass. Continue stirring for 3 minutes to ensure that HPMA molecules are in full contact with the mineral surface. Step 4: Adding the collector Add sodium oleate, i.e. NaOL collector, to the slurry. The amount of collector used for single mineral flotation is 60 mg / L, and the amount of collector used for mixed mineral flotation is 80 mg / L. Based on the mass of the slurry, continue stirring for 3 minutes. Step 5: Foam Flotation Maintain the flotation machine speed at 1700 r / min, keep the aeration rate at 100 ml / min, scrape the foam for 3 minutes, and collect the foam product as concentrate. The slurry at the bottom of the flotation cell is the suppressed tailings. Step Six: Processing of Flotation Products The flotation froth product is dried to obtain flotation concentrate; the product in the flotation tank is dried to obtain flotation tailings.

2. The application of the garnet flotation inhibitor according to claim 1, characterized in that: In step one, the rutile mineral has a TiO2 content of ≥94% and is sourced from Madagascar, while the garnet mineral has a Fe2O3 content of ≥38% and is sourced from Rwanda.

3. The application of the garnet flotation inhibitor according to claim 1, characterized in that: In step two, when making mixed ore, weigh out 1g of rutile and 1g of garnet. The flotation effect is best when the pH of the pulp is adjusted to 8 with sodium hydroxide.

4. The application of the garnet flotation inhibitor according to claim 1, characterized in that: In step three, the optimal dosage of the single mineral flotation depressant is 25 mg / L; the optimal dosage of the mixed mineral flotation depressant is 5 mg / L.

5. The application of the garnet flotation inhibitor according to claim 1, characterized in that: The single mineral flotation results, with 2g each of rutile and garnet, at pH=8 and collector dosage of 60mg / L: When the inhibitor HPMA was used at a concentration of 15 mg / L, the recovery rate of rutile was 89.98%, and the recovery rate of garnet was 41.31%. When the inhibitor HPMA was used at a concentration of 20 mg / L, the recovery rate of rutile was 85.46%, and the recovery rate of garnet was 27.20%. When the inhibitor HPMA was used at a concentration of 25 mg / L, the recovery rate of rutile was 85.66%, and the recovery rate of garnet was 7.96%. When the inhibitor HPMA was used at a concentration of 30 mg / L, the recovery rate of rutile was 72.01%, and the recovery rate of garnet was 2.65%. When the inhibitor HPMA was used at a concentration of 35 mg / L, the recovery rate of rutile was 50.44% and the recovery rate of garnet was 5.26%.

6. The application of the garnet flotation inhibitor according to claim 1, characterized in that: The flotation results of the mixed ore, with 1g of rutile and 1g of garnet mixed at pH=8 and collector dosage of 80mg / L: When the inhibitor HPMA dosage was 0 mg / L, the TiO2 grade in the rutile flotation concentrate was 57.14%, and the recovery rate was 91.43%. When the inhibitor HPMA was used at a concentration of 2 mg / L, the TiO2 grade in the rutile flotation concentrate was 88.81%, and the recovery rate was 94.41%. When the inhibitor HPMA was used at a concentration of 5 mg / L, the TiO2 grade in the rutile flotation concentrate was 95.90%, and the recovery rate was 92.14%. When the inhibitor HPMA was used at a concentration of 10 mg / L, the TiO2 grade in the rutile flotation concentrate was 94.71%, and the recovery rate was 92.34%. When the inhibitor HPMA was used at a concentration of 15 mg / L, the TiO2 grade in the rutile flotation concentrate was 92.20%, and the recovery rate was 87.61%.

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