Inhibitor for reverse flotation of micro-fine particle hematite and use method

Abstract

The invention aims to provide an inhibitor for reverse flotation of micro-fine-particle hematite and a use method of the inhibitor, aiming at the problem that the micro-fine-particle hematite cannot be effectively inhibited by an existing iron ore reverse flotation process technology. According to the inhibitor, AMPS (2-acrylamido-2-methylpropanesulfonic acid) is subjected to chemical modification in a weakly alkaline solution, a product AMPS (OH <->) is generated, then in hematite flotation operation, the hydrophilicity of micro-fine particle hematite is improved, the flotation performance difference of hematite and silicate minerals is effectively increased, and efficient removal of the silicate minerals is facilitated. In addition, the modified inhibitor AMPS (OH <->) has the characteristics of strong selectivity, small dosage, simple preparation and the like, and can effectively reduce the content of silicon in the flotation concentrate of the micro-fine particle hematite, improve the yield and the recovery rate of the flotation concentrate and realize the target of efficient impurity removal of the micro-fine particle disseminated hematite.

Description

Technical Field

[0001] The invention relates to the field of iron ore dressing and purification technology, and in particular to an inhibitor for reverse flotation of fine hematite and a use method thereof. Background Art

[0002] At present, hematite resources are finely embedded and complex in composition, and fine grinding is required to achieve sufficient monomer dissociation. The conventional technology for processing hematite is to use starch to inhibit the floatability of hematite under strong alkaline conditions, activate silicate minerals such as quartz with calcium chloride, and then use sodium oleate to capture silicate minerals such as quartz, thereby separating gangue minerals from hematite.

[0003] However, the current separation process cannot effectively process fine-grained hematite (particle size <20μm). This type of iron ore is very easy to adhere to the quartz surface due to its small particle size and strong surface chemical activity, and is thus entrained into the foam layer by quartz particles, reducing the recovery rate of flotation operations. In his paper "Experimental Study on the Mineral Processing of a Low-Grained Fine-Grained Embedded Hematite Ore", Wang Weizhi used anion reverse flotation process on fine-grained embedded hematite (particle size <20μm), and the iron recovery rate was only 60.04%. Summary of the invention

[0004] The purpose of the present invention is to solve the problem that the existing iron ore reverse flotation process technology cannot effectively inhibit fine hematite ore (particle size <20μm), and to provide a fine hematite reverse flotation inhibitor and a method of use. The inhibitor of the present invention is to chemically modify AMPS (2-acrylamide-2-methylpropanesulfonic acid) in a weakly alkaline solution to generate a product AMPS (OH - ), and then in the flotation operation of hematite, the hydrophilicity of fine hematite is increased, and the difference in flotation performance between hematite and silicate minerals is effectively increased, which is convenient for the efficient removal of silicate minerals. In addition, the modified inhibitor AMPS (OH - ) has the characteristics of strong selectivity, small dosage and simple preparation. It can effectively reduce the silicon content in the flotation concentrate of fine hematite ore, improve the flotation concentrate yield and recovery rate, and achieve the goal of efficient impurity removal of fine embedded hematite ore.

[0005] A depressant for reverse flotation of fine hematite, AMPS (OH - ), wherein AMPS is 2-acrylamide-2-methylpropanesulfonic acid, which is a multifunctional water-soluble anionic surfactant monomer with a molecular formula of C 7 H 13 NO 4 S. The inhibitor of the present invention can increase the hydrophilicity of fine hematite in the flotation operation of hematite, effectively increase the difference in flotation performance between fine hematite and silicate minerals, and facilitate the efficient removal of silicate minerals.

[0006] Furthermore, the inhibitor for reverse flotation of fine hematite is obtained by modifying AMPS with a weak alkaline solution.

[0007] Furthermore, the above-mentioned inhibitor for reverse flotation of fine hematite is prepared by:

[0008] At room temperature, a weak alkaline solution with a pH value of 7.5 to 8.5 was added with AMPS, stirred and mixed evenly, and then placed in a constant temperature water bath for chemical modification to obtain the inhibitor AMPS (OH - ); among them, the inhibitor AMPS (OH - ) is 0.2-0.5% AMPS (OH - )—weak alkaline solution, namely the inhibitor AMPS(OH - ) and the mass ratio of the weak base solution is 0.2-0.5 g / 100 g, the temperature of the water bath is controlled at 70-80° C., and the modification time is 3-6 h; the weak base solution is an aqueous solution of sodium carbonate, sodium bicarbonate, sodium acetate, etc., preferably an aqueous solution of sodium carbonate.

[0009] The present invention also provides a method for using a depressant for reverse flotation of fine hematite, wherein the depressant is added into the flotation pulp of fine hematite, wherein the mass percentage concentration of the fine hematite pulp is 20-30%, the mass ratio of the depressant addition amount to the fine hematite pulp is 500-800 g / t, and the depressant is AMPS (OH) with a mass concentration of 0.2-0.5%. - )—weak alkaline solution.

[0010] Furthermore, the method for using the above-mentioned inhibitor for reverse flotation of fine hematite comprises the following specific steps:

[0011] Step 1: Crushing, Grinding, Classification

[0012] The fine-grained hematite ore is crushed and ball-milled to obtain hematite ore powder, wherein the mass of the hematite ore powder with a particle size of less than 38 μm accounts for 85-95% of the total mass of the hematite ore powder; the hematite ore powder is wet-screened to obtain fine-grained hematite ore slurry (particle size <20 μm) and the remaining coarse-grained hematite ore slurry (this part can be effectively treated by conventional flotation process), and the concentration of the fine-grained hematite ore slurry is determined;

[0013] Step 2: Mixing the slurry

[0014] The fine-grained hematite ore pulp obtained by screening is placed in a flotation device for slurry adjustment to obtain a micro-fine hematite ore flotation slurry with a mass percentage concentration of 20 to 30%;

[0015] Step 3: Counter-flotation

[0016] Under room temperature, add pH adjuster to fine hematite ore slurry, adjust the slurry pH value to 10.5-12, and stir to mix evenly; then add inhibitor to fine hematite ore slurry with pH value of 10.5-12, stir for 2-3 minutes, then add activator calcium chloride, stir for 2-3 minutes, finally add collector, stir for 2-3 minutes; then carry out desiliconization flotation frothing of fine hematite ore, and the flotation frothing time is 3-6 min, to obtain a flotation foam product and a hematite flotation concentrate in the tank; wherein the mass ratio of the amount of the inhibitor to the fine-grained hematite ore slurry is 600-800 g / t, preferably 750 g / t; the mass ratio of the amount of the activator to the fine-grained hematite ore slurry is 500-700 g / t, preferably 600 g / t; the mass ratio of the amount of the collector to the fine-grained hematite ore slurry is 800-1000 g / t, preferably 1000 g / t;

[0017] Step 4: Processing of flotation products

[0018] The flotation foam product is dried to obtain flotation tailings; the product in the tank is dried to obtain fine-grained hematite flotation concentrate.

[0019] In the step 2, the flotation equipment is a single tank flotation machine, and its rotation speed is 1700-2100 rpm, preferably 1900 rpm.

[0020] In the step 3, the pH adjuster is a NaOH aqueous solution with a mass percentage concentration of 0.5-1.5%, preferably a NaOH aqueous solution with a mass percentage concentration of 1%.

[0021] In step 3, the inhibitor is AMPS (OH - ), specifically, the inhibitor AMPS (OH - )-weak alkaline solution, the preferred mass percentage concentration is 0.3%.

[0022] In the step 3, the collector is preferably a sodium oleate aqueous solution with a mass percentage concentration of 3-5%, and more preferably a sodium oleate aqueous solution with a mass percentage concentration of 3%.

[0023] In the step 3, after the pH adjuster is added, the slurry stirring rate is 1700-2100 rpm, preferably 1900 rpm, and the stirring and mixing time is 2-4 min, preferably 3 min.

[0024] The obtained hematite flotation concentrate has a TFe content (mass percentage) of 66.5-68.5%, and SiO 2The mass percentage is 1.5-3.5%, and the recovery rate is 73.27-82.65%.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] 1. The present invention provides an effective inhibitor AMPS (OH-) for reverse flotation of fine hematite with good selective inhibitory effect. Since a large number of active site iron ions are exposed on the surface of fine hematite, and the acrylamide group exposed by the inhibitor AMPS (OH-) has a strong action energy on iron ions, the inhibitor AMPS (OH-) can be strongly adsorbed on the surface of fine hematite, weakening the adsorption of the collector (sodium oleate) on the surface of fine hematite, and inhibiting the floatability of fine hematite. However, there is no active site iron on the surface of silicate minerals such as quartz, and the adsorption of the inhibitor AMPS (OH-) on the quartz surface is weak, which does not affect the adsorption of the collector (sodium oleate) on the quartz surface after calcium ion activation. Therefore, the inhibitor AMPS (OH-) increases the difference in flotation performance between fine hematite and quartz, can well inhibit the floatability of fine hematite, and significantly improve the recovery rate of fine hematite.

[0027] 2. Compared with traditional starch inhibitors, the novel high-efficiency inhibitor AMPS (OH-) provided by the present invention has the characteristics of strong selectivity for fine-grained hematite, small dosage and simple preparation. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 , flow chart of the inhibition method for reverse flotation of fine-grained hematite. DETAILED DESCRIPTION

[0029] The present invention is further described in detail below in conjunction with embodiments.

[0030] The following embodiments may enable those skilled in the art to more fully understand the present invention, but are not intended to limit the present invention in any way.

[0031] The fine-grained hematite ore described in the following examples is the original hematite ore from Anshan and Benxi, Liaoning Province. The multi-element analysis of the ore based on X-ray fluorescence spectroscopy shows that the main components are as follows: TFe is 25-35%, SiO 2 40-55%, CaO 1.5-3.5%, Al 2 O 3 It is 0.5-2%, MgO is 0.5-2.5%, and the rest are impurities.

[0032] In the following examples, the sodium oleate collector aqueous solution is prepared by adding sodium oleate collector solid powder to deionized water, heating to 50-60° C., and stirring until the sodium oleate collector solid powder is completely dissolved to obtain the sodium oleate collector aqueous solution.

[0033] Example 1

[0034] The fine-grained hematite ore selected in this embodiment has the following main components in terms of mass percentage: TFe is 33.68%, SiO 2 is 48.23%, CaO is 1.92%, Al 2 O 3 It is 0.52%, MgO is 0.85%, and the rest are impurities.

[0035] The process flow chart of its implementation is shown in Figure 1 , specifically including the following operation process of reverse flotation desiliconization of fine-grained embedded hematite ore:

[0036] Step 1: Crushing, Grinding, Classification

[0037] The fine-grained embedded hematite ore is crushed and ball-milled to obtain hematite ore powder; wherein, in the hematite ore powder, the mass of hematite ore powder less than 38 μm accounts for 88.5% of the total mass of the hematite ore powder; the hematite ore powder is wet-sieved through a sieve to obtain a fine-grained hematite ore portion (particle size <20 μm), and the fine-grained hematite ore portion is vacuum-dried at a low temperature, and the oven temperature is controlled at 80°C.

[0038] Step 2: Prepare the modified inhibitor solution

[0039] Take an appropriate amount of AMPS and place it in a beaker, add deionized water and stir to mix evenly, then add a weak alkaline solution (sodium carbonate) to adjust the solution pH to 8, stir and mix evenly, place it in a constant temperature water bath for chemical modification, and control the water bath temperature at 80°C to obtain the modified inhibitor AMPS (OH - ). Among them, the amount of AMPS added was 0.4 g, the volume of deionized water was 100 mL, and the water bath time was 5.5 h.

[0040] Step 3: Mixing the slurry

[0041] The obtained hematite ore powder is placed in an XFG single-slot flotation machine, the speed of the XFG single-slot flotation machine is adjusted to 1900 rpm, deionized water is added and stirred and mixed evenly, and slurrying is performed for 3 minutes to obtain hematite ore slurry; wherein the mass percentage concentration of hematite ore in the hematite ore slurry is 25%;

[0042] Step 4: Counter-flotation

[0043] At room temperature, the pH adjuster solution was added to the fine hematite ore slurry to adjust the pH value to 11.5, and the mixture was stirred evenly at a stirring rate of 1900 rpm for 3 min. The prepared modified inhibitor AMPS (OH) was added to the fine hematite ore flotation slurry with a pH value of 11.5. - ), modified inhibitor AMPS(OH - ) is added in an amount of 750 g / t to the mass concentration of the slurry, stirred for 3 minutes, then an activator calcium chloride is added, the amount of calcium chloride added in the mass concentration of the slurry is 600 g / t, stirred for 3 minutes, and finally a collector sodium oleate solution is added, the amount of sodium oleate added in the mass concentration of the slurry is 1000 g / t, stirred for 3 minutes; desiliconization flotation frothing of fine hematite ore is carried out, the flotation frothing is performed every 20 seconds, the total flotation frothing time is 5 minutes, and a flotation foam product and a hematite flotation concentrate in the tank are obtained.

[0044] Step 5: Processing of flotation products

[0045] The flotation froth product is vacuum dried at low temperature to obtain flotation tailings; the product in the tank is vacuum dried at low temperature to obtain fine hematite flotation concentrate; the low temperature drying means that the oven temperature is controlled at 80°C. The flotation tailings and fine hematite flotation concentrate are dried and weighed separately, and then the grade is tested and the product index is calculated.

[0046] In this embodiment, the TFe grade (mass percentage content) of the fine hematite flotation concentrate product obtained by flotation is 67.85%, and the SiO 2 The mass percentage is 2.21% and the recovery rate is 82.65%.

[0047] Example 2

[0048] The fine-grained hematite ore selected in this embodiment has the following main components in terms of mass percentage: TFe is 28.32%, SiO 2 52.27%, CaO 3.05%, Al 2 O 3 It is 1.59%, MgO is 2.13%, and the rest are impurities.

[0049] The process flow chart of its implementation is shown in Figure 1 , specifically including the following operation process of reverse flotation of fine-grained hematite ore:

[0050] Step 1: Crushing, Grinding, Classification

[0051] The fine-grained embedded hematite ore is crushed and ball-milled to obtain hematite ore powder; wherein, in the hematite ore powder, the mass of hematite ore powder less than 38μm accounts for 92.5% of the total mass of the hematite ore powder; the hematite ore powder is wet-sieved through a sieve to obtain a fine-grained hematite ore portion (particle size <20μm), and the fine-grained hematite ore portion is vacuum-dried at a low temperature, and the oven temperature is controlled at 80°C.

[0052] Step 2: Prepare the modified inhibitor solution

[0053] Take an appropriate amount of AMPS and place it in a beaker, add deionized water and stir to mix evenly, then add sodium carbonate weak alkaline solution, adjust the solution pH to 8, stir and mix evenly, place it in a constant temperature water bath for chemical modification, and control the water bath temperature at 80°C to obtain the modified inhibitor AMPS (OH - ). Among them, the amount of AMPS added was 0.4 g, the volume of deionized water was 100 mL, and the water bath time was 5.5 h.

[0054] Step 3: Mixing the slurry

[0055] The obtained hematite ore powder is placed in an XFG single-slot flotation machine, the speed of the XFG single-slot flotation machine is adjusted to 1900 rpm, deionized water is added and stirred and mixed evenly, and slurrying is performed for 3 minutes to obtain hematite ore slurry; wherein the mass percentage concentration of hematite ore in the hematite ore slurry is 25%;

[0056] Step 4: Counter-flotation

[0057] At room temperature, the pH adjuster solution was added to the fine hematite ore slurry to adjust the pH value to 12, and the mixture was stirred evenly at a stirring rate of 1900 rpm for 3 min. The prepared modified inhibitor AMPS (OH) was added to the fine hematite ore flotation slurry with a pH value of 12. - ), modified inhibitor AMPS(OH - ) is added in an amount of 800 g / t to the slurry, stirred for 3 minutes, then an activator calcium chloride is added, the amount of calcium chloride added is 500 g / t to the slurry, stirred for 3 minutes, and finally a collector sodium oleate solution is added, the amount of sodium oleate added is 1000 g / t to the slurry, stirred for 3 minutes; flotation frothing of fine hematite ore is carried out, the frothing is done once every 20 seconds, the total flotation frothing time is 5 minutes, and a flotation foam product and a flotation concentrate of hematite ore in the tank are obtained.

[0058] Step 5: Processing of flotation products

[0059] The flotation froth product is vacuum dried at low temperature to obtain flotation tailings; the product in the tank is vacuum dried at low temperature to obtain fine hematite flotation concentrate; the low temperature drying means that the oven temperature is controlled at 80°C. The flotation tailings and fine hematite flotation concentrate are dried and weighed separately, and then the grade is tested and the product index is calculated.

[0060] In this embodiment, the TFe grade (mass percentage content) of the fine hematite flotation concentrate product obtained by flotation is 66.95%, and the SiO 2 The mass percentage is 3.04% and the recovery rate is 77.81%.

[0061] Example 3

[0062] The fine-grained hematite ore selected in this embodiment has the following main components in terms of mass percentage: TFe is 26.07%, SiO 2 54.65%, CaO 2.16%, Al 2 O 3 It is 0.89%, MgO is 1.11%, and the rest are impurities.

[0063] The process flow chart of its implementation is shown in Figure 1 , specifically including the following operation process of reverse flotation of fine-grained hematite ore:

[0064] Step 1: Crushing, Grinding, Classification

[0065] The fine-grained embedded hematite ore is crushed and ball-milled to obtain hematite ore powder; wherein, in the hematite ore powder, the mass of hematite ore powder less than 38μm accounts for 94.5% of the total mass of the hematite ore powder; the hematite ore powder is wet-sieved through a sieve to obtain a fine-grained hematite ore portion (particle size <20μm), and the fine-grained hematite ore portion is vacuum-dried at a low temperature, and the oven temperature is controlled at 80°C.

[0066] Step 2: Prepare the modified inhibitor solution

[0067] Take an appropriate amount of AMPS and place it in a beaker, add deionized water and stir to mix evenly, then add sodium carbonate weak alkaline solution, adjust the solution pH to 8, stir and mix evenly, place it in a constant temperature water bath for chemical modification, and control the water bath temperature at 80°C to obtain the modified inhibitor AMPS (OH - ). Among them, the amount of AMPS added was 0.4 g, the volume of deionized water was 100 mL, and the water bath time was 5.5 h.

[0068] Step 3: Mixing the slurry

[0069] The obtained hematite ore powder is placed in an XFG single-slot flotation machine, the speed of the XFG single-slot flotation machine is adjusted to 1900 rpm, deionized water is added and stirred and mixed evenly, and slurrying is performed for 3 minutes to obtain hematite ore slurry; wherein the mass percentage concentration of hematite ore in the hematite ore slurry is 30%;

[0070] Step 4: Counter-flotation

[0071] At room temperature, the pH adjuster solution was added to the fine hematite ore slurry to adjust the pH value to 12, and the mixture was stirred evenly at a stirring rate of 1900 rpm for 3 min. The prepared modified inhibitor AMPS (OH) was added to the fine hematite ore flotation slurry with a pH value of 12. - ), modified inhibitor AMPS(OH - ) is added in an amount of 600 g / t to the mass concentration of the slurry, stirred for 3 minutes, then an activator calcium chloride is added, the amount of calcium chloride added in the mass concentration of the slurry is 700 g / t, stirred for 3 minutes, and finally a collector sodium oleate solution is added, the amount of sodium oleate added in the mass concentration of the slurry is 900 g / t, stirred for 3 minutes; desiliconization flotation frothing of fine hematite ore is carried out, the flotation frothing is performed every 20 seconds, the total flotation frothing time is 5 minutes, and a flotation foam product and a hematite flotation concentrate in the tank are obtained.

[0072] Step 5: Processing of flotation products

[0073] The flotation froth product is vacuum dried at low temperature to obtain flotation tailings; the product in the tank is vacuum dried at low temperature to obtain fine hematite flotation concentrate; the low temperature drying means that the oven temperature is controlled at 80°C. The flotation tailings and fine hematite flotation concentrate are dried and weighed separately, and then the grade is tested and the product index is calculated.

[0074] In this embodiment, the TFe grade (mass percentage content) of the fine hematite flotation concentrate product obtained by flotation is 66.62%, and the SiO 2 The mass percentage is 3.38% and the recovery rate is 77.81%.

[0075] Comparative Example 1

[0076] The fine-grained embedded hematite ore used in this comparative example is the same as that in Example 3.

[0077] The process flow chart of its implementation is shown in Figure 1 , specifically including the following operation process of reverse flotation of fine-grained hematite ore:

[0078] Step 1: Crushing, Grinding, Classification

[0079] Same as Example 3.

[0080] Step 2: Prepare starch solution

[0081] Take an appropriate amount of sodium hydroxide solution and place it in a beaker. Add deionized water to adjust the pH value of the solution to 10. Place the beaker in a water bath and stir to mix evenly. Then weigh an appropriate amount of starch (chemical formula (C 6 H 10 O 5 ) n ) and slowly add it into the beaker, stir and mix evenly while heating, and control the temperature of the water bath pot at 80°C to obtain a starch solution. Among them, the amount of starch added is 0.05g, the amount of sodium hydroxide added is 0.02g, the volume of deionized water is 100mL, and the water bath time is 1h.

[0082] Step 3: Mixing the slurry

[0083] Same as Example 3.

[0084] Step 4: Counter-flotation

[0085] Under room temperature, add pH adjuster solution to fine hematite ore slurry, adjust pH value to 12, and stir to mix evenly; add prepared inhibitor starch to fine hematite ore flotation slurry with pH value of 12, the amount of inhibitor starch added is 1200g / t of slurry mass concentration, stir for 3min, then add activator calcium chloride, the amount of calcium chloride added is 600g / t of slurry mass concentration, stir for 3min, finally add collector sodium oleate solution, the amount of sodium oleate added is 900g / t of slurry mass concentration, stir for 3min; carry out desiliconization flotation frothing of fine hematite ore, frothing once every 20s, the total flotation frothing time is 5min, and obtain flotation foam product and hematite flotation concentrate in the tank.

[0086] Step 5: Processing of flotation products

[0087] The flotation froth product is vacuum dried at low temperature to obtain flotation tailings; the product in the tank is vacuum dried at low temperature to obtain fine hematite flotation concentrate; the low temperature drying means that the oven temperature is controlled at 80°C. The flotation tailings and fine hematite flotation concentrate are dried and weighed separately, and then the grade is tested and the product index is calculated.

[0088] In this embodiment, the TFe grade (mass percentage content) of the fine hematite flotation concentrate product obtained by flotation is 61.12%, and the SiO 2 The mass percentage is 4.95% and the recovery rate is 63.14%.

Claims

1. A depressant for reverse flotation of fine hematite, characterized in that: AMPS(OH - ), wherein AMPS is 2-acrylamido-2-methylpropanesulfonic acid.

2. The inhibitor for reverse flotation of fine hematite according to claim 1, characterized in that: The inhibitor is obtained by modifying AMPS with a weak alkaline solution.

3. The method for preparing the inhibitor for reverse flotation of fine hematite according to claim 1, characterized in that: At room temperature, a weak alkaline solution with a pH value of 7.5 to 8.5 was added with AMPS, stirred and mixed evenly, and then placed in a constant temperature water bath for chemical modification to obtain the inhibitor AMPS (OH - ); among them, the inhibitor AMPS (OH - ) is 0.2-0.5% AMPS (OH - )—weak alkaline solution, the water bath temperature is controlled at 70-80℃, and the modification time is 3-6h.

4. The method for preparing the inhibitor for reverse flotation of fine hematite according to claim 3, characterized in that: The weak alkaline solution is an aqueous solution of sodium carbonate, sodium bicarbonate, or sodium acetate.

5. A method for using a depressant for reverse flotation of fine hematite, characterized in that: The inhibitor is added to the fine hematite ore flotation slurry, wherein the mass percentage concentration of the fine hematite ore slurry is 20-30%, the mass ratio of the inhibitor addition amount to the fine hematite ore slurry is 500-800 g / t, and the inhibitor is AMPS (OH - )—weak alkaline solution.

6. The method for using the inhibitor for reverse flotation of fine hematite according to claim 5, characterized in that: The specific steps are as follows: Step 1: Crushing, Grinding, Classification The fine-grained hematite ore is crushed and ball-milled to obtain hematite ore powder, wherein the mass of the hematite ore powder with a particle size of less than 38 μm accounts for 85-95% of the total mass of the hematite ore powder; the hematite ore powder is wet-screened to obtain fine-grained hematite ore slurry with a particle size of less than 20 μm and the remaining coarse-grained hematite ore slurry, and the concentration of the fine-grained hematite ore slurry is determined; Step 2: Mixing the slurry The fine-grained hematite ore pulp obtained by screening is placed in a flotation device for slurry adjustment to obtain a micro-fine hematite ore flotation slurry with a mass percentage concentration of 20 to 30%; Step 3: Counter-flotation Under room temperature conditions, a pH adjuster is added to the fine-grained hematite ore slurry to adjust the pH value of the slurry to 10.5-12; an inhibitor is then added to the fine-grained hematite ore slurry with a pH value of 10.5-12, and the slurry is stirred for 2-3 minutes; an activator, calcium chloride, is then added, and the slurry is stirred for 2-3 minutes; finally, a collector is added, and the slurry is stirred for 2-3 minutes; and then, desiliconization flotation frothing of the fine-grained hematite ore is performed, and the flotation frothing frothing time is 3-6 minutes to obtain a flotation froth product and a flotation concentrate of hematite in a tank; The mass ratio of the inhibitor to the fine hematite ore slurry is 600-800 g / t; the mass ratio of the activator to the fine hematite ore slurry is 500-700 g / t; the mass ratio of the collector to the fine hematite ore slurry is 800-1000 g / t; Step 4: Processing of flotation products The flotation foam product is dried to obtain flotation tailings; the product in the tank is dried to obtain fine-grained hematite flotation concentrate.

7. The method for using the inhibitor for reverse flotation of fine hematite according to claim 6, characterized in that: In the step 2, the flotation equipment is a single tank flotation machine, and its rotation speed is 1700-2100rpm; in the step 3, after the pH adjuster is added, the slurry stirring rate is 1700-2100rpm, and the stirring mixing time is 2-4min.

8. The method for using the inhibitor for reverse flotation of fine hematite according to claim 6, characterized in that: In the step 3, The pH adjuster is a NaOH aqueous solution with a mass percentage concentration of 0.5 to 1.5%; The inhibitor is an inhibitor AMPS (OH - )—weak alkaline solution; The collector is a sodium oleate aqueous solution with a mass percentage concentration of 3-5%.

9. The method for using the inhibitor for reverse flotation of fine hematite according to claim 5 or 6, characterized in that: In the obtained hematite flotation concentrate, the TFe grade is 66.5-68.5%, the SiO2 mass percentage is 1.5-3.5%, and the recovery rate is 73.27-82.65%.

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