CN112403688B - Preparation method of suspended-state-based powdery super-hydrophobic magnetic carrier and application of suspended-state-based powdery super-hydrophobic magnetic carrier in mineral flotation - Google Patents
Preparation method of suspended-state-based powdery super-hydrophobic magnetic carrier and application of suspended-state-based powdery super-hydrophobic magnetic carrier in mineral flotation Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D1/00—Flotation
- B03D1/02—Froth-flotation processes
- B03D1/023—Carrier flotation; Flotation of a carrier material to which the target material attaches
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D1/00—Flotation
- B03D1/02—Froth-flotation processes
- B03D1/025—Froth-flotation processes adapted for the flotation of fines
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D2203/00—Specified materials treated by the flotation agents; specified applications
- B03D2203/02—Ores
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
A preparation method of a powdered super-hydrophobic magnetic carrier based on a suspension state and an application of the powdered super-hydrophobic magnetic carrier in mineral flotation relate to the field of efficient utilization of poor and fine refractory ores. The invention relates to a preparation method of a powdered super-hydrophobic magnetic carrier based on a suspension state, which comprises the following steps of (1) preparing the powdered magnetic carrier; (2) adjusting the surface roughness of the powdery magnetic carrier; (3) the preparation method comprises three steps of preparing the super-hydrophobic film on the surface of the powdered magnetic carrier in a suspension system. The three powdery super-hydrophobic magnetic carriers obtained by the method are mixed according to a certain proportion, are applied to flotation of poor and fine difficult-to-separate ores, improve the flotation recovery rate of target minerals by more than one percent under the condition of not influencing the flotation process and the quality of concentrate products, and realize high-efficiency utilization of the poor and fine difficult-to-separate ores.
Description
Technical Field
A preparation method of a suspension-state-based powdery super-hydrophobic magnetic carrier and application thereof in mineral flotation relate to the field of efficient utilization of poor, fine and impurity refractory ores.
Background
The efficient recovery of the micro-fine fraction minerals belongs to a worldwide problem, along with the continuous expansion of the mining and utilization scale of mineral resources, the ore which is simple and easy to select is increasingly reduced, the selection proportion of the poor, fine and miscellaneous difficult-to-select ores is increased year by year, and the conventional flotation process flow has poor recovery effect on the micro-fine fraction minerals in the poor, fine and miscellaneous difficult-to-select ores, so that the loss of the mineral resources is caused.
The reason why the fine-particle molybdenite particles are difficult to select is that the fine-particle minerals existing in the ore have the characteristics of small mass, poor mineralization effect on the surface of bubbles, low flotation speed and the like, so that the flotation recovery effect of the fine-particle minerals is greatly influenced.
In order to improve the development and utilization rate of poor, fine and miscellaneous refractory mineral resources, the efficient recovery technology research of fine-grained minerals in fine-disseminated ores needs to be carried out; meanwhile, the high-efficiency recovery technology of the micro-fine fraction minerals is one of the important development directions in the field of mineral separation.
Carrier flotation, also known as piggyback flotation, is a flotation method for recovering fine-grained target minerals by piggyback fine-grained minerals using hydrophobic coarse-grained minerals suitable for flotation as carriers. Depending on the type of carrier, there are also different types of carrier flotation and the same type of carrier flotation (self-carrier flotation). The carrier flotation has the characteristics of economy, environmental protection, easy operation, small influence on the current flotation process and equipment, easy implementation and the like, and is extremely suitable for the high-efficiency recovery of poor, fine and miscellaneous difficultly-selected ores.
The powdery super-hydrophobic magnetic carrier belongs to heterogeneous carrier flotation, and the used carrier minerals have the characteristics of good hydrophobicity, easy magnetic separation and recovery, firm super-hydrophobic film and reusability, and can improve the flotation recovery rate of target minerals in poor, fine and miscellaneous difficultly-selected ores by over 1 percent.
Disclosure of Invention
The target minerals in the poor, fine and impurity-containing refractory ores have low grade and high fine fraction content, so the conventional flotation process flow has poor recovery effect on the ores, and mineral resources are lost. The invention aims to provide a powdery super-hydrophobic magnetic carrier which can not only realize the recovery of fine-grained minerals by bearing the fine-grained target minerals, but also improve the content of hydrophobic minerals to improve the mineralization process, and finally realize the efficient utilization of poor fine and impurity refractory ores; meanwhile, the powdery super-hydrophobic magnetic carrier has the advantages of good hydrophobicity, easiness in recovery, firm super-hydrophobic film, reusability and the like.
In order to achieve the above task, the present invention adopts the following technical solutions.
The invention relates to a preparation method of a suspended state-based powdery super-hydrophobic magnetic carrier, which comprises the following steps of (1) preparing the powdery magnetic carrier; (2) adjusting the surface roughness of the powdery magnetic carrier; (3) The preparation method comprises three steps of preparing the super-hydrophobic film on the surface of the powdered magnetic carrier in a suspension system.
The preparation of the powdery magnetic carrier (1) is characterized by comprising the following steps:
(1) one or a mixture of more of pure minerals or concentrate powders of strong magnetic minerals such as magnetite, titanomagnetite, maghemite, zinc-iron spinel and the like is used as a magnetic carrier;
(2) preparing the demagnetized powdery magnetic carrier into ore pulp with the mass concentration of 20-70%, and feeding the ore pulp into a high-frequency vibrating screen or a multi-product continuous cyclone group to obtain four granularity levels of magnetic carriers with the granularity of +97 mu m, -97 mu m-76 mu m, -76 mu m-38 mu m and-38 mu m;
(3) and processing the part of the magnetic carrier with the diameter of +97 mu m by an ore grinding classification process, and taking three powdery magnetic carriers with the diameters of-97 mu m to +76 mu m, -76 mu m to +38 mu m and-38 mu m as qualified raw materials for later use.
The adjustment of the surface roughness of the powdery magnetic carrier is characterized by comprising the following steps:
(1) preparing ore pulp with the mass concentration of 30-40% by three powdery magnetic carrier products of-97 mu m to +76 mu m to-76 mu m to +38 mu m and-38 mu m respectively;
(2) adding three kinds of powdery magnetic carrier ore pulp into an acid corrosion groove respectively, controlling the concentration of one or more mixtures of dilute sulfuric acid or dilute nitric acid to be 0-1 mol/L, and etching the magnetic carrier in the acid corrosion groove for 0-240min;
(3) and (3) sequentially carrying out thickening, filtering, washing, thickening, filtering, drying and cooling on the acidic magnetic carrier flowing out of the acid corrosion tank to obtain the magnetic carrier with proper surface roughness.
The preparation of the super-hydrophobic film on the surface of the powdered magnetic carrier in the suspension system in the step (3) is characterized by comprising the following steps:
(1) respectively scattering three magnetic carriers with proper surface roughness by adopting airflow;
(2) adding the scattered three magnetic carriers into a fluidized bed dryer or a suspension roaster or other suspension equipment respectively, introducing gas mixed with low free energy hydrophobic substance steam and hot air according to a certain proportion, allowing the suspended and scattered powdery magnetic carriers to fully react with the low free energy hydrophobic substance steam, cooling and collecting in the fluidized bed dryer or suspension roaster suspension auxiliary equipment to obtain three powdery super-hydrophobic magnetic carriers respectively, wherein the low free energy hydrophobic substance comprises perfluoroalkyl acid (C) 10 -C 30 ) Fatty acid (C) 10 -C 30 ) And perfluoroalkanes (C) 10 -C 30 ) The proportion of the low free energy hydrophobic substance steam in the mixture of the low free energy hydrophobic substance steam and hot air is 0-100%.
Application of powdered hydrophobic magnetic carrier in mineral flotation
(1) Aiming at the properties of poor, fine and miscellaneous refractory ores, three powdered super-hydrophobic magnetic carriers after degaussing treatment are prepared into a mixture according to a certain proportion;
(2) calculating the metal weight of a target mineral in the ore to be processed per minute according to the production capacity of a selected factory, uniformly feeding a super-hydrophobic magnetic carrier mixture with the weight being 1-10 times of the target metal weight into a magnetic carrier stirring barrel per minute, and enabling the mixture to act with an ore grinding grading product for 0-10min; meanwhile, before the ground ore grading product enters a stirring barrel containing a magnetic carrier, size mixing, and addition of a regulator and a collecting agent need to be completed in a front stirring barrel;
(3) and adding a proper amount of foaming agent into the mixed ore pulp from the magnetic carrier stirring barrel, and then feeding the mixed ore pulp into a flotation machine to realize flotation separation, thereby finally obtaining flotation rough concentrate.
The function of the above raw materials (ingredients) or preparation process is as follows:
1. the reason for adopting pure minerals or concentrate powder of strong magnetic minerals such as magnetite, titanomagnetite, maghemite, zinc ferrite and the like as carrier minerals is that (1) the super-hydrophobic magnetic carrier prepared from the strong magnetic minerals can be separated from non-magnetic target minerals by a magnetic separation method after being used and can be recycled; (2) the pure minerals or concentrate powder of the ferromagnetic minerals have wide sources, low price and easy purchase.
2. The magnetic carrier is prepared into three size fractions of-97 mu m to +76 mu m to-76 mu m to +38 mu m and-38 mu m, and can be mixed for use according to a certain proportion, because the early experimental study shows that: in the carrier flotation process, the carrier minerals with the size fractions of-76 mu m to +38 mu m have the best use effect and flotation index, then the carrier minerals with the size fractions of-97 mu m to +76 mu m and finally the carrier minerals with the size fractions of-38 mu m are obtained; however, for ores with different properties, the required amount of carrier minerals of each grade is different, and therefore, the carrier minerals need to be mixed and used according to the properties of the ores according to a certain proportion.
3. The acid etching is carried out on the surface of the magnetic carrier by adopting dilute sulfuric acid, dilute nitric acid or a mixture of the dilute sulfuric acid and the dilute nitric acid to ensure that the surface of the carrier mineral has different roughness, the roughness of the surface of the carrier mineral plays a crucial role in the adsorption and reaction of low-free-energy hydrophobic substance steam on the surface in the next step, and meanwhile, the proper surface roughness is favorable for improving the firmness of the super-hydrophobic film.
4. The magnetic carrier is in a suspension and dispersion state, so that the gasified low-free-energy hydrophobic substance can fully react with the surface of the magnetic carrier, and the reacted super-hydrophobic magnetic carrier is cooled and collected under the suspension condition, thereby avoiding the agglomeration problem caused by the fact that the super-hydrophobic film on the surface of the super-hydrophobic magnetic carrier is not dry.
5. The low free energy hydrophobic substance is selected from perfluoro alkyl acid (C) 10 -C 30 ) Fatty acid (C) 10 -C 30 ) And perfluoroalkanes (C) 10 -C 30 ) Because the perfluoro fatty acid and the fatty acid can react with the surface of the magnetic carrier and are fixed on the surface of the magnetic carrier, the perfluoro alkane can further improve the hydrophobicity of the surface of the magnetic carrier after the perfluoro alkyl acid and the fatty acid are adsorbed, so that the contact angle of the surface of the super-hydrophobic magnetic carrier is larger than 150 degrees, and the rolling angle is smaller than 8 degrees.
The method selects powdery ferromagnetic minerals as magnetic carriers, adjusts the surface roughness of the magnetic carriers by acid etching, and then leads gaseous low free energy hydrophobic substances to be adsorbed on the surfaces of the magnetic carriers under the conditions of suspension and dispersion, thereby finally obtaining the powdery super-hydrophobic magnetic carriers with three grain sizes. The super-hydrophobic magnetic carrier can not only realize the recovery of fine-grained minerals by bearing the fine-grained target minerals, but also improve the mineralization process by increasing the content of the hydrophobic minerals, and finally realize the efficient utilization of poor, fine and miscellaneous difficultly-selected ores; meanwhile, the powdery super-hydrophobic magnetic carrier has the advantages of good hydrophobicity, easiness in recovery, firm super-hydrophobic film, reusability and the like.
The specific implementation mode is as follows:
preparation of Superhydrophobic magnetic Carrier example 1
(1) Carrying out high-frequency screening classification on 1000g of demagnetized Xinjiang magnetite concentrate to obtain 57g of-97 mu m to +76 mu m size magnetic carriers, 435g of-76 mu m to +38 mu m size magnetic carriers and 508g of-38 mu m size magnetic carriers;
(2) preparing three powdered magnetic carrier products into ore pulp with the mass concentration of 35-40% respectively, adding the ore pulp into an acid etching tank respectively, controlling the concentration of dilute sulfuric acid to be 0.1mol/L, and keeping etching for 30min; then, filtering, washing, filtering, drying and cooling are carried out;
(3) after the three cooling products are scattered by airflow, respectively placing the three cooling products into a laboratory fluidized bed dryer, adding mixed gas with a perfluorinated octadecanoic acid steam and hot air ratio of 1.
Preparation of super hydrophobic magnetic Carrier example 2
This example differs from example 1 in that: the magnetic carrier raw material, the dilute sulfuric acid concentration, the etching time and the proportion of the three size grades of the super-hydrophobic magnetic carriers are different, namely the magnetic carrier raw material is maghemite, the dilute sulfuric acid concentration is 0.2 mol/L, the etching time is 18min, and the proportion of the three size grades of the super-hydrophobic magnetic carriers is 2.
Preparation of super hydrophobic magnetic Carrier example 3
This example differs from example 1 in that: the magnetic carrier raw material, the low free energy hydrophobic substance and the mixing ratio of steam and hot air thereof are different from the proportion of the three-size super-hydrophobic magnetic carriers, namely the magnetic carrier raw material is titanomagnetite, the low free energy hydrophobic substance is a mixture of perfluorotridecanoic acid and perfluorohexadecane, the mixing ratio of the hot steam and the hot air of the mixture is 2.
Preparation of Superhydrophobic magnetic Carrier example 4
The present example differs from example 1 in that: the magnetic carrier raw material, acid and concentration, the low free energy hydrophobic substance and the three size fractions of the super-hydrophobic magnetic carrier are different in proportion, namely the magnetic carrier raw material is maghemite, the acid is a mixture of diluted sulfuric acid and diluted nitric acid 1.
Preparation of Superhydrophobic magnetic Carrier example 5
The present example differs from example 1 in that: the magnetic carrier raw material and the superhydrophobic magnetic carriers of the three size fractions are different in proportion, namely the magnetic carrier raw material is a 1.
Application example of powdered hydrophobic magnetic Carrier in mineral flotation 1
Basic properties of the ore: the molybdenum content in certain molybdenum ore raw ore in Shaanxi is 0.16%, the gangue is mainly quartz, mica and the like, and each kilogram of molybdenum ore contains 2.67 g molybdenite.
1kg of molybdenum ore (raw ore) is ground to obtain a product with the content of-200 meshes accounting for 60 percent, the product is added into a 3L flotation machine, the concentration of ore pulp is controlled to be 30 percent, the stirring intensity is 1900r/min, then 300g/t of water glass and 80g/t of diesel oil are added in sequence, and the mixture is stirred for 3min and 2min respectively; and then 5g of the super-hydrophobic magnetic carrier mixture obtained in the preparation example 1 of the super-hydrophobic magnetic carrier is added, the mixture is stirred for 4min, then 50g/t of 2# oil is added, the mixture is stirred for 2min, finally, flotation is carried out for 3min, foam and products in a flotation tank are collected, the super-hydrophobic magnetic carrier is recovered through magnetic separation, and molybdenite flotation indexes and super-hydrophobic magnetic carrier consumption conditions are calculated after filtration, drying, weighing, sample preparation and assay, wherein specific indexes are shown in the table.
The test result shows that under the condition that the grinding fineness, the pulp concentration, the stirring strength, the water glass dosage, the diesel fuel dosage and the 2# oil dosage are the same, the grade and the recovery rate of the molybdenite rough concentrate after the super-hydrophobic magnetic carrier is used are respectively 1.2 percent and 2.41 percent higher than those of the molybdenum concentrate subjected to conventional flotation, and the loss rate of the super-hydrophobic magnetic carrier is 0.36 percent.
Application example of powdered hydrophobic magnetic carrier in mineral flotation 2
Basic properties of the ore: WO in certain molybdenum tailings selected from Henan 3 The content of the scheelite is 0.1 percent, the target mineral is scheelite, the gangue is mainly quartz, fluorite, calcite, apatite and the like, and 2.56 g of scheelite is contained in each kilogram of tailings.
1kg of molybdenum dressing tailings with the fineness of-200 meshes accounting for 65 percent are added into a 3L flotation machine, the concentration of ore pulp is controlled to be 30 percent, the stirring strength is 1700r/min, then 1000g/t of sodium carbonate and 300g/t of sodium oleate are sequentially added, and stirring is carried out for 3min and 2min respectively; and adding 8g of the super-hydrophobic magnetic carrier mixture obtained in the super-hydrophobic magnetic carrier preparation example 4, stirring for 6min, finally performing flotation for 5min, collecting foams and products in a flotation tank, performing magnetic separation to recover the super-hydrophobic magnetic carrier, filtering, drying, weighing, preparing samples, testing, and calculating the scheelite flotation index and the super-hydrophobic magnetic carrier consumption condition, wherein the specific indexes are shown in the table.
The test result shows that under the condition that the grinding fineness, the pulp concentration, the stirring strength, the sodium carbonate dosage and the sodium oleate dosage are the same, after the super-hydrophobic magnetic carrier is used, the grade and the recovery rate of the scheelite rough concentrate are respectively 0.5 percent and 6.32 percent higher than those of the scheelite rough concentrate obtained by conventional flotation, and the loss rate of the super-hydrophobic magnetic carrier is 0.19 percent.
Application example 3 of powdery hydrophobic magnetic carrier in mineral flotation
Basic properties of the ore: the Cu content of a certain low-grade copper ore in Shanxi is 0.5%, the target mineral is copper sulfide mainly comprising chalcopyrite, the gangue is mainly comprising quartz, feldspar, sericite and the like, and 14.4 g of copper sulfide is contained in each kilogram of tailings.
Grinding 1kg (raw ore) to obtain a product with a content of-200 meshes accounting for 60%, adding the product into a 3L flotation machine, controlling the concentration of ore pulp to be 30%, stirring the product with the stirring strength of 1800r/min, then sequentially adding 500g/t of lime and 50g/t of xanthate, and stirring the mixture for 3min and 2min respectively; and adding 29 g of the super-hydrophobic magnetic carrier mixture obtained in the super-hydrophobic magnetic carrier preparation example 3, stirring for 5min, adding 30 g/t of 2# oil, stirring for 2min, performing flotation for 4min, collecting foams and products in a flotation tank, performing magnetic separation to recover the super-hydrophobic magnetic carrier, filtering, drying, weighing, preparing a sample, and performing assay to calculate a scheelite flotation index and the consumption condition of the super-hydrophobic magnetic carrier, wherein the specific indexes are shown in the table.
Test results show that under the condition that the grinding fineness, the pulp concentration, the stirring strength, the sodium carbonate dosage and the sodium oleate dosage are the same, after the super-hydrophobic magnetic carrier is used, the grade and the recovery rate of the scheelite rough concentrate are respectively 0.1 percent and 2.01 percent higher than those of the scheelite rough concentrate by conventional flotation, and the loss rate of the super-hydrophobic magnetic carrier is 0.21 percent.
Claims (2)
1. A preparation method of a powdered super-hydrophobic magnetic carrier based on a suspension state is characterized by comprising the following steps: preparing a powdery magnetic carrier; the preparation method of the powdery magnetic carrier comprises the steps of firstly preparing the demagnetized powdery magnetic carrier into ore pulp with the mass concentration of 20-70%, feeding the ore pulp into a high-frequency vibrating screen or a multi-product continuous cyclone group to obtain four granularity levels of magnetic carriers with the granularity of +97 mu m, -97 mu m-76 mu m, -76 mu m-38 mu m and-38 mu m, and grinding the part of the magnetic carriers with the granularity of +97 mu m, wherein the granularity of-97 mu m-76 mu m, -76 mu m-38 mu m and-38 mu m are three granularity levels of the powdery magnetic carrierTaking the raw materials as qualified raw materials for later use; (2) adjusting the surface roughness of the powdery magnetic carrier; preparing the obtained three qualified raw materials into ore pulp with the mass concentration of 35-40%, respectively performing acid etching, concentration, filtration, washing, concentration, filtration, drying and cooling in sequence to obtain the roughness suitable for the attachment of the low free energy hydrophobic substance on the surface of the powdery magnetic carrier, wherein the concentration C of one or two mixtures of dilute sulfuric acid and dilute nitric acid is controlled in the acid etching process, C is more than 0 and less than or equal to 1mol/L, and the etching time t on the surface of the magnetic carrier is kept 1 ，0＜t 1 Less than or equal to 240min; (3) Preparing a super-hydrophobic film on the surface of a powdered magnetic carrier in a suspension system; three particle-size magnetic carriers with proper surface roughness are respectively in a suspension state by utilizing mixed gas of low-free-energy hydrophobic substance steam and hot air according to a certain proportion, and after the mixed gas fully acts with the low-free-energy hydrophobic substance steam, airflow is cooled and collected to obtain powdery super-hydrophobic magnetic carriers, wherein a fluidized bed dryer or a suspension roasting furnace is adopted to finish the suspension film preparation and cooling process of the magnetic carriers, the low-free-energy hydrophobic substance comprises one or two mixtures of perfluoroalkyl acid with a carbon chain length of C10-C30, fatty acid with a carbon chain length of C10-C30 and perfluoroalkane with a carbon chain length of C10-C30, and the proportion of the low-free-energy hydrophobic substance steam to the mixed gas of the low-free-energy hydrophobic substance steam and the hot air is 0.1% -100%; wherein the magnetic carrier is one or a mixture of more of magnetite, titanomagnetite, maghemite and zinc-iron spinel.
2. A flotation process for obtaining high fine fraction target mineral content ore from low grade non-ferrous metal sulfide or oxide ore, using three fraction powdered super-hydrophobic magnetic carriers obtained by the suspension-based powdered super-hydrophobic magnetic carrier preparation method of claim 1 as carrier minerals, characterized in that (1) three powdered super-hydrophobic magnetic carrier mixtures in different proportions are prepared according to the ore property difference and are degaussed before use; (2) Calculating the metal weight of a target mineral in the ore to be processed per minute according to the plant selection production capacity, uniformly feeding the super-hydrophobic magnetic carrier mixture with the weight being 1 to 10 times of the target metal weight per minute to the magnetic carrier and stirringMixing in a barrel, and reacting with the grinding graded overflow product for a time t 2 ，0＜t 2 Less than or equal to 10min; (3) Before the ground ore classification product enters a stirring barrel containing a magnetic carrier, size mixing, adding of a regulator and a collecting agent are required to be completed in a front stirring barrel; (4) And adding a foaming agent into the mixed ore pulp flowing out of the magnetic carrier stirring barrel, and then feeding the mixed ore pulp into a flotation machine for flotation operation to finally obtain flotation rough concentrate.
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