Flotation method for micro-fine particle oxidized ore

Abstract

The invention discloses a flotation method for micro-fine particle oxidized ore, belongs to the technical field of mineral flotation, and aims to solve the problem of poor flotation effect of the micro-fine particle oxidized ore caused by residual valuable minerals in flotation tailings of the micro-fine particle oxidized ore in the prior art. The method comprises the steps that raw ore particles and a flotation reagent are mixed and mixed in a stirring and size mixing barrel; the mineral slurry is fed into a flotation machine for roughing, and roughing concentrate and roughing tailings are obtained; the roughing concentrate is fed into a flotation machine for concentration, concentration concentrate and concentration tailings are obtained, and roughing is conducted on the concentration tailings again; the roughing tailings and a scavenging collecting agent are mixed and then scavenged, and scavenged concentrate and scavenged tailings are obtained; and scavenging concentrate is subjected to roughing again. The method can be used for flotation of micro-fine particle oxidized ore.

Description

Technical Field

[0001] The present invention belongs to the technical field of mineral flotation, and particularly relates to a flotation method for fine-grained oxidized ore. Background Art

[0002] Fine-grained oxidized ore usually refers to mineral particles with a particle size less than 20 μm. Such minerals face problems in flotation such as strong dispersibility, large specific surface area, many adsorbed impurities, low probability of collision with bubbles, and poor selectivity.

[0003] In the prior art, the usual flotation process is as follows:

[0004] The raw ore particles and flotation reagents are mixed and slurried in a stirring and slurrying tank, and the obtained mineral slurry is subjected to flotation to obtain concentrate and tailings.

[0005] However, it should be noted that the tailings still contain some valuable minerals, and these valuable minerals are not recovered, resulting in low flotation recovery rate and poor flotation effect of fine-grained oxidized ore. Summary of the Invention

[0006] In view of the above analysis, the present invention aims to provide a flotation method for fine-grained oxidized ore to solve the problem of low flotation recovery rate and poor flotation effect of fine-grained oxidized ore caused by residual valuable minerals in the flotation tailings of fine-grained oxidized ore in the prior art.

[0007] The object of the present invention is mainly achieved through the following technical solutions.

[0008] The present invention provides a flotation method for fine-grained oxidized ore, comprising the following steps:

[0009] Step 1: The raw ore particles and flotation reagents are mixed and slurried in a stirring and slurrying tank so that the flotation reagents are adsorbed on the surface of the raw ore particles to obtain a mineral slurry;

[0010] Step 2: The mineral slurry is fed into a flotation machine for rough selection to obtain rough concentrate and rough tailings;

[0011] Step 3: The rough concentrate is fed into a flotation machine for cleaning to obtain clean concentrate and clean tailings, and the clean tailings are returned to Step 2 for re-rough selection;

[0012] The rough tailings are mixed with a scavenging collector and then scavenged to obtain scavenged concentrate and scavenged tailings;

[0013] Step 4: The scavenged concentrate is returned to Step 2 for re-rough selection.

[0014] Further, in Step 1, the mixing and slurrying time is 3 min to 5 min.

[0015] Further, in Step 1, the flotation reagents, calculated by mass parts, include 2 - 3 parts of rougher collector, 0.5 - 1.5 parts of pH regulator, 0.9 - 2.0 parts of inhibitor, and 0.3 - 0.9 parts of frother.

[0016] Further, the dosage of the rougher collector is 100 g / t - 300 g / t of raw ore particles, and the mass concentration of the rougher collector is not higher than 2%.

[0017] Further, the pH regulator is sodium carbonate or sodium hydroxide.

[0018] Further, the inhibitor is sodium silicate, sodium hexametaphosphate, or carboxymethyl cellulose.

[0019] Further, the frother is pine oil or 4 - methyl - 2 - pentanol.

[0020] Further, in Step 1, the pH value of the flotation pulp is 7 - 11.

[0021] Further, in Step 3, the dosage of the scavenger collector is 25 g / t - 100 g / t of raw ore particles.

[0022] Further, the applicable particle size range of the minerals for the flotation method is 5 μm to 200 μm.

[0023] Compared with the prior art, the present invention can at least achieve the following beneficial effects:

[0024] The flotation method for fine - grained oxidized ore provided by the present invention further includes cleaning and scavenging after rougher flotation, and the cleaning tailings and scavenging tailings are recycled for secondary rougher flotation, so as to fully utilize the valuable minerals in the cleaning tailings and scavenging tailings, improve the recovery rate of oxidized ore and the flotation effect of fine - grained oxidized ore.

[0025] In the present invention, the above - mentioned technical solutions can also be combined with each other to achieve more preferred combined solutions. Other features and advantages of the present invention will be described in the subsequent specification, and some advantages can be made obvious from the specification, or understood by implementing the present invention. The objectives and other advantages of the present invention can be realized and obtained from the content specifically pointed out in the embodiments of the specification and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The drawings are only for the purpose of showing specific embodiments, and are not considered as a limitation to the present invention. Throughout the drawings, the same reference signs represent the same components.

[0027] Figure 1 It is a flowchart of the flotation method for fine - grained oxidized ore provided by the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] The preferred embodiments of the present invention will be specifically described below in conjunction with the accompanying drawings. The accompanying drawings form a part of the present invention and are used together with the embodiments of the present invention to illustrate the principles of the present invention, rather than to limit the scope of the present invention.

[0029] The present invention provides a flotation method for fine-grained oxidized ore. Refer to Figure 1 , which includes the following steps:

[0030] Step 1: The raw ore particles and the flotation reagent are mixed and conditioned in a stirring and conditioning tank so that the flotation reagent is adsorbed on the surface of the raw ore particles to obtain a mineral slurry;

[0031] Step 2: The mineral slurry is fed into a flotation machine for rough selection to obtain a rough concentrate and a rough tailing;

[0032] Step 3: The rough concentrate is fed into a flotation machine for cleaning to obtain a cleaned concentrate and a cleaned tailing. The cleaned tailing is returned to Step 2 for re-rough selection;

[0033] The rough tailing is mixed with a scavenging collector and then scavenged to obtain a scavenged concentrate and a scavenged tailing;

[0034] Step 4: The scavenged concentrate is returned to Step 2 for re-rough selection.

[0035] It should be noted that the above flotation method is particularly applicable to mineral particle sizes in the range of 5 μm to 200 μm.

[0036] Compared with the prior art, the flotation method for fine-grained oxidized ore provided by the present invention includes cleaning and scavenging after rough selection, and the cleaned tailing and the scavenged tailing are recycled to Step 2 for secondary rough selection, so as to fully utilize the valuable minerals in the cleaned tailing and the scavenged tailing, improve the recovery rate of oxidized ore and the flotation effect of fine-grained oxidized ore.

[0037] Exemplarily, in the above Step 1, the mixing and conditioning time is 3 min to 5 min to ensure the full mixing of the raw ore particles and the flotation reagent.

[0038] It should be noted that in the above Step 1, for the composition of the flotation reagent, specifically, it includes 2 to 3 parts by mass of a roughing collector, 0.5 to 1.5 parts by mass of a pH regulator, 0.9 to 2.0 parts by mass of an inhibitor, and 0.3 to 0.9 parts by mass of a foaming agent. Among them, the dosage of the roughing collector is 100 g / t to 300 g / t of raw ore particles, and the mass concentration of the roughing collector is not higher than 2%.

[0039] Exemplarily, the pH regulator is sodium carbonate or sodium hydroxide, the inhibitor is sodium silicate, sodium hexametaphosphate or carboxymethyl cellulose, and the foaming agent is pine oil or 4-methyl-2-pentanol.

[0040] In order to further improve the flotation efficiency, in the above step 1, the pH value of the flotation pulp is 7-11 to ensure that the flotation is carried out under neutral or alkaline conditions.

[0041] In order to ensure the scavenging effect, in the above step 3, the amount of scavenging collector used is 25g / t to 100g / t of raw ore particles.

[0042] As for the structures of the roughing collector and the scavenging collector, both are spherical structures, including a microsphere core (particle size is 100-1000nm), a coupling grafting layer and a functional grafting layer arranged on the surface of the coupling grafting layer in sequence from the center of the sphere to the surface, and the microsphere core and the coupling grafting layer are connected by covalent bonds.

[0043] Exemplarily, the roughing collector and the scavenging collector are dicarboxylic acid nano collectors or amide-sulfonic acid nano collectors.

[0044] For dicarboxylic acid nano-collectors, the microsphere core is a metal oxide nanoparticle (e.g., TiO 2 Metal oxide nanoparticles and / or Fe 2 O 3 The raw material of the coupling grafting layer (i.e., coupling agent) is 5-hexenyltrimethoxysilane and / or 7-octenyltrimethoxysilane, the raw material of the functional grafting layer is butenedioic acid (e.g., maleic acid and / or fumaric acid), and the grafting amount of butenedioic acid is 5% to 20%.

[0045] This dicarboxylic acid nano-collector, on the one hand, adopts a multi-layer composite structure, so that the particle size of the dicarboxylic acid nano-collector is greatly increased, which can increase the collision probability of the dicarboxylic acid nano-collector and the original ore particles, and the surface grafting layer of the dicarboxylic acid nano-collector is formed by dicarboxylic acid (-COOH), and the number of surface functional groups is greatly increased. In the flotation process, it can provide highly selective adsorption sites on the surface of fine-grained oxidized minerals, so that the interaction between the reagent and the mineral particles is enhanced, and the dicarboxylic acid nano-collector can form a stable adsorption layer on the surface of the mineral particles; on the other hand, the The alkyl chain (C6 or C8) of the grafted layer gives the collector good hydrophobicity, fundamentally improving the hydrophobicity of the surface of the mineral particles, and can achieve effective collision and adsorption of the dicarboxylic acid nano collector with the original ore particles, thereby effectively improving the flotation efficiency and selectivity of fine-grained oxidized minerals; on the other hand, the core metal oxide nanoparticles (i.e., the microsphere core) of the above-mentioned dicarboxylic acid nano collector are connected to the functional grafted layer through the Si-OM bond (M is Ti or Fe) of the silane coupling agent, which can significantly improve the chemical stability of the dicarboxylic acid nano collector in an aqueous environment.

[0046] For the amide-sulfonic acid-based nano collector, the microsphere core is a non-metal oxide nanoparticle (e.g., SiO 2 non-metal oxide nanoparticle). The raw material of the coupling grafting layer (i.e., coupling agent) is 3-aminopropyltrimethoxysilane, 3-aminopropyltriethoxysilane, and / or 3-aminopropyldimethylmethoxysilane. The raw material of the functional grafting layer is 2-acrylamido-2-methylpropanesulfonic acid (AMPS), and the grafting amount of 2-acrylamido-2-methylpropanesulfonic acid is 10% - 30%.

[0047] On the one hand, this amide-sulfonic acid-based nano collector has a relatively large particle size and a multi-functional group design, which enhances the collision and adhesion ability between the flotation reagent and fine-grained oxidized minerals. Through a large number of sulfonic acid groups (-SO 3 H) and amide groups (-CONH 2 ), it provides selective adsorption sites, which can strengthen the mass transfer efficiency of the flotation reagent at the solid-liquid interface of fine-grained oxidized ore, enabling the flotation reagent to form a stable adsorption layer on the mineral surface, fundamentally improving the hydrophobicity of the mineral surface, and achieving higher selectivity and stronger collection effect. On the other hand, the above amide-sulfonic acid-based nano flotation reagent has strong adaptability, significantly reduces the lower limit of fine-grained ore flotation, and thus greatly improves the recovery rate of fine-grained mineral resources. On the other hand, the above amide-sulfonic acid-based nano flotation reagent is also environmentally friendly. The materials used are non-toxic and pollution-free, and can meet environmental protection standards in actual production.

[0048] It can be understood that in order to obtain the rougher collector and scavenger collector with a spherical structure, the following steps are also included before the above step 1:

[0049] Prepare the rougher collector and scavenger collector.

[0050] It should be noted that the preparation methods of the rougher collector and scavenger collector are the same, and specifically include the following steps:

[0051] Step a: Disperse the microsphere core in a solution (e.g., a mixed solution of an organic solvent and deionized water, with a volume ratio of 9 - 10:1) and ultrasonically disperse for 15 min - 25 min to form a uniform microsphere core dispersion liquid;

[0052] Step b: Mix the microsphere core dispersion liquid with the raw material of the coupling grafting layer, adjust the pH to 4 - 6, hydrolyze and stir for 30 min - 60 min, and then heat to 60°C - 90°C and react for 1 h - 4 h to form a chemical bond grafting between the raw material of the coupling grafting layer and the surface of the microsphere core, forming a coupling grafting layer on the surface of the microsphere core. The concentration of the raw material of the coupling grafting layer is 0.1 M - 0.5 M, so as to uniformly cover the surface of the microsphere core and ensure the sufficiency of the subsequent grafting reaction;

[0053] Step c: mixing the microsphere core with a coupling grafting layer formed on the surface with the raw material of the functional grafting layer, and causing a polymerization reaction at 60°C to 80°C in a closed container for 1h to 3h under the action of a free radical initiator (for example, ammonium persulfate, potassium persulfate, hydrogen peroxide or azobisisobutyronitrile), so that the raw material of the functional grafting layer is grafted on the surface of the coupling grafting layer, and a functional grafting layer is formed on the surface of the coupling grafting layer to obtain a roughing collector and a scavenging collector, wherein the concentration of the raw material of the functional grafting layer is 0.01M to 0.2M, so that the surface of the coupling grafting layer can be evenly covered to ensure the sufficiency of the subsequent grafting reaction, and the concentration of the free radical initiator is 0.1mM to 2mM.

[0054] Exemplarily, the raw materials of the roughing collector and the scavenging collector are both 5-hexenyltrimethoxysilane and 7-octenyltrimethoxysilane.

[0055] Accordingly, the above step b includes the following steps:

[0056] Step b1: mixing the microsphere core dispersion with 7-octenyltrimethoxysilane, performing a first hydrolysis and stirring and then a first heating, so that 7-octenyltrimethoxysilane forms a chemical bond graft with the surface of the microsphere core, and a 7-octenyltrimethoxysilane layer is formed on the surface of the microsphere core to obtain a first composite structure, wherein the 7-octenyltrimethoxysilane layer is a continuous structure, but the continuous structure has gaps, and the gaps expose part of the surface of the microsphere core;

[0057] Step b2: washing and drying the first composite structure to remove the 7-octenyltrimethoxysilane layer that does not form a chemical bond with the microsphere core;

[0058] Step b3: Mix the first composite structure with 5-hexenyltrimethoxysilane, perform a second hydrolysis and stirring, and then heat for a second time, so that 5-hexenyltrimethoxysilane forms a chemical bond grafting with the exposed microsphere core surface, and 5-hexenyltrimethoxysilane fills the gaps in the 7-octenyltrimethoxysilane layer to form a 5-hexenyltrimethoxysilane layer. The 7-octenyltrimethoxysilane layer and the 5-hexenyltrimethoxysilane layer constitute a coupled grafting layer.

[0059] In this way, the coupling grafting layer adopts a composite structure (including a 7-octenyltrimethoxysilane layer as the continuous phase and a 5-hexenyltrimethoxysilane layer as the discontinuous phase). The exposed surface of the microsphere core is covered twice with 5-hexenyltrimethoxysilane. Since the carbon chain of 5-hexenyltrimethoxysilane is shorter and its molecular volume is smaller, it can better enter the voids in the 7-octenyltrimethoxysilane layer to form chemical bond grafting, thus ensuring complete coverage of the microsphere core by the coupling grafting layer. In addition, due to the different molecular sizes of 5-hexenyltrimethoxysilane and the 7-octenyltrimethoxysilane layer, the surface of the formed coupling grafting layer has a certain roughness, which can improve the bonding stability between the coupling grafting layer and the functional grafting layer.

[0060] Exemplarily, the raw materials of the roughing collector and the scavenging collector are both 3-aminopropyltriethoxysilane and 3-aminopropyldimethylmethoxysilane.

[0061] Correspondingly, step b above includes the following steps:

[0062] Step b1': Mix the microsphere core dispersion with 3-aminopropyltriethoxysilane, hydrolyze and stir for the first time and then heat for the first time, so that 3-aminopropyltriethoxysilane forms chemical bond grafting with the surface of the microsphere core, and a 3-aminopropyltriethoxysilane layer is formed on the surface of the microsphere core to obtain a first composite structure. 3-aminopropyltriethoxysilane is a continuous structure, but the continuous structure has voids that expose part of the surface of the microsphere core.

[0063] Step b2': Wash and dry the first composite structure to remove the 3-aminopropyltriethoxysilane layer that has not formed a chemical bond with the microsphere core.

[0064] Step b3': Mix the first composite structure with 3-aminopropyldimethylmethoxysilane, hydrolyze and stir for the second time and then heat for the second time, so that 3-aminopropyldimethylmethoxysilane forms chemical bond grafting with the exposed surface of the microsphere core. 3-aminopropyldimethylmethoxysilane fills into the voids of the 3-aminopropyltriethoxysilane layer to form a 3-aminopropyldimethylmethoxysilane layer. The 3-aminopropyltriethoxysilane and the 3-aminopropyldimethylmethoxysilane layer constitute the coupling grafting layer.

[0065] In this way, the coupling grafting layer adopts a composite structure (including 3-aminopropyltriethoxysilane in the continuous phase and 3-aminopropyldimethylmethoxysilane layer in the discontinuous phase). The exposed surface of the microsphere core is secondarily covered with 3-aminopropyldimethylmethoxysilane. Since the molecular volume of 3-aminopropyldimethylmethoxysilane is smaller, it can better enter the voids of the 3-aminopropyltriethoxysilane layer to form chemical bonding grafting, thus ensuring the complete coverage of the microsphere core by the coupling grafting layer. In addition, due to the large difference in molecular sizes between 3-aminopropyltriethoxysilane and 3-aminopropyldimethylmethoxysilane, the surface of the formed coupling grafting layer has a certain roughness, which can improve the binding stability between the coupling grafting layer and the amidosulfonic acid group grafting layer 3.

[0066] Example 1

[0067] This example provides a flotation method for fine-grained oxidized ore, including the following steps:

[0068] Add 50 g of Fe 2 O 3 nanoparticles (particle size of 200 nm) into a mixed solution of 950 ml of ethanol and deionized water (volume ratio 9:1), and ultrasonically disperse for 20 min to obtain a homogeneous dispersion; add 0.2 M of 7-octenyltrimethoxysilane to the dispersion, adjust the pH to 5.5 with acetic acid, hydrolyze and stir for 1 h, then heat to 85 °C and react for 1.5 h; after the reaction, separate the product by centrifugation, wash it 4 times with ethanol, and vacuum dry it at 60 °C or below for 2 h. Add the dried product into a mixed solution of 950 ml of ethanol and deionized water (volume ratio 9:1), ultrasonically disperse for 20 min, add 0.1 M of 5-hexenyltrimethoxysilane, adjust the pH to 5.5 with acetic acid, hydrolyze and stir for 1 h, then heat to 85 °C and react for 1.5 h. After the reaction, separate the product by centrifugation, wash it 4 times with ethanol, and vacuum dry it at 60 °C or below for 2 h to obtain silane-functionalized Fe 2 O 3 nanoparticles; Disperse the above silane-functionalized Fe 2 O 3 nanoparticles in 100 ml of 0.015 M maleic acid solution, and add 0.3 mM of ammonium persulfate (APS) as an initiator; after ultrasonically dispersing for 15 min, carry out a polymerization reaction in a sealed container at 70 °C for 1 h; after the reaction is completed, cool to room temperature, separate the product by centrifugation, and wash it 4 times with deionized water, and finally vacuum dry it at 60 °C or below for 4 h to obtain the rougher collector and scavenger collector.

[0069] Use the prepared collector to treat a certain ilmenite in Chengde. The raw material TiO 2The grade is 9.39%. The main titanium minerals are ilmenite, and the gangue minerals are olivine, pyroxene, garnet, etc. The lower limit of the ore particle size is 10 μm, and the proportion below 20 μm is 22%.

[0070] Based on the relative addition amount of flotation reagents to the original ore, 220 g / t of the obtained collector is used as the flotation collector, 150 g / t of soda ash is used as the pH adjuster, 200 g / t of water glass is used as the inhibitor, and 30 g / t of pine oil is used as the foaming agent. It is fully slurried with ilmenite, and then a flotation process of one roughing, two scavenging and two cleaning is carried out. The concentrate and tailings are collected. The mixing and slurrying time is 3 min, the pH value of the flotation pulp is 8, and the dosage of the scavenging collector is 50 g / t of the original ore particles.

[0071] The results of the ilmenite flotation test are shown in Table 1 below:

[0072] Table 1 Flotation test results of a certain ilmenite in Chengde

[0073] Product Yield / % <![CDATA[TiO 2 Grade / %]]> <![CDATA[TiO 2 Recovery rate / %]]> Concentrate 24.12 35.23 90.61 Tailings 75.88 1.16 9.39 Run-of-mine 100.00 9.38 100.00

[0074] Example 2

[0075] The preparation method of the amide-sulfonic acid group nano flotation reagent provided in this example includes:

[0076] Materials: SiO 2 nano microspheres (particle size: 300 nm), 3-aminopropyltriethoxysilane and 3-aminopropyldimethylmethoxysilane, 2-acrylamide-2-methylpropanesulfonic acid (AMPS), potassium persulfate initiator.

[0077] The specific steps are as follows: Add 60 g of SiO 2 nano microspheres to a mixed solution of 950 mL of acetone and deionized water (volume ratio of 92:8), and ultrasonically disperse for 15 min to obtain a uniform dispersion; add 0.5 M of 3-aminopropyltriethoxysilane to the dispersion, adjust the pH to 5.0 with acetic acid, stir and hydrolyze for 30 min, then heat to 65 °C and react for 2 h. After the reaction, perform centrifugal separation, wash 4 times and dry in vacuum at 65 °C for 3 h; add the dried particles to a mixed solution of 950 mL of acetone and deionized water (volume ratio of 92:8), and ultrasonically disperse for 12 min to obtain a uniform dispersion; add 0.1 M of 3-aminopropyldimethylmethoxysilane to the dispersion, adjust the pH to 5.0 with acetic acid, stir and hydrolyze for 30 min, then heat to 65 °C and react for 2 h. After the reaction, perform centrifugal separation, wash 4 times and dry in vacuum at 65 °C for 3 h; the amino-functionalized SiO 2The particles were added to 150 mL of 0.2 M AMPS solution, and 1.5 mM potassium persulfate was added as an initiator. The mixture was ultrasonically dispersed for 15 min. The mixture was heated to 60 °C in a sealed reactor and reacted for 3 h. After cooling, it was centrifuged, washed 4 times and dried in vacuo at 65 °C for 6 h to obtain the roughing collector and scavenging collector.

[0078] Taking a tungsten ore in Chenzhou, Hunan as the ore particles, the raw material WO 3 grade was 0.347%, the main tungsten minerals were scheelite and wolframite, the gangue minerals were calcite and quartz, etc., the lower limit of the ore particle size was 5 μm, and the proportion below 20 μm was 36%.

[0079] Calculated based on the addition amount of flotation reagents relative to the original ore, 150 g / t of the obtained flotation reagent was taken as the flotation reagent, 50 g / t of soda ash was used as the pH adjuster, 80 g / t of water glass was the inhibitor, and 40 g / t of pine oil was the foaming agent. It was fully slurried with the tungsten ore in Chenzhou, Hunan. After a technological process of one roughing, two cleanings and two scavengings, the concentrate and tailings were collected. The mixing and slurrying time was 5 min, the pH value of the flotation pulp was 10, and the dosage of the scavenging collector was 80 g / t of the original ore particles.

[0080] The results of the flotation test are shown in Table 2 below:

[0081] Table 2 Flotation test results of a tungsten ore in Chenzhou, Hunan

[0082] Product Yield / % <![CDATA[WO 3 Grade / %]]> <![CDATA[WO 3 Recovery rate / %]]> Concentrate 0.71 47.54 89.47 Tailings 99.29 0.04 10.53 Run-of-mine 100.00 0.38 100.00

[0083] As mentioned above, it is only the preferred specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A flotation method for fine-grained oxide ore, characterized in that: The steps include: Step 1: The raw ore particles and the flotation reagent are mixed and slurried in a stirring slurry mixing tank, so that the flotation reagent is adsorbed on the surface of the raw ore particles to obtain a mineral slurry; Step 2: feeding the mineral slurry into a flotation machine for roughing to obtain roughing concentrate and roughing tailings; Step 3: The rougher concentrate is fed into a flotation machine for concentration to obtain a concentrated concentrate and concentrated tailings. The concentrated tailings are returned to step 2 for re-roughing; The rougher tailings are mixed with a scavenging collector and then scavenged to obtain scavenged concentrate and scavenged tailings; Step 4: The scavenged concentrate returns to step 2 for re-roughing.

2. The flotation method of fine oxide ore according to claim 1, characterized in that: In the step 1, the mixing and slurrying time is 3 minutes to 5 minutes.

3. The flotation method of fine oxide ore according to claim 1, characterized in that: In the step 1, the flotation reagents include 2-3 roughing collectors, 0.5-1.5 pH adjusters, 0.9-2.0 inhibitors and 0.3-0.9 frothers in terms of mass fractions.

4. The flotation method of fine oxide ore according to claim 3, characterized in that: The dosage of the roughing collector is 100 g / t to 300 g / t of raw ore particles, and the mass concentration of the roughing collector is not higher than 2%.

5. The flotation method of fine oxide ore according to claim 3, characterized in that: The pH regulator is sodium carbonate or sodium hydroxide.

6. The flotation method of fine oxide ore according to claim 3, characterized in that: The inhibitor is sodium silicate, sodium hexametaphosphate or carboxymethyl cellulose.

7. The flotation method of fine oxide ore according to claim 3, characterized in that: The foaming agent is pine oil or 4-methyl-2-pentanol.

8. The flotation method of fine oxide ore according to claim 3, characterized in that: In the step 1, the pH value of the flotation pulp is 7-11.

9. The flotation method of fine oxide ore according to claim 3, characterized in that: In step 3, the amount of the scavenging collector is 25 g / t to 100 g / t of raw ore particles.

10. The flotation method of fine oxide ore according to any one of claims 1 to 9, characterized in that: The flotation method is applicable to mineral particles in the range of 5 μm to 200 μm.

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