A method for separating weakly magnetic minerals by magnetic seed circulating enhanced flocculation magnetic separation

Abstract

The application discloses a kind of weak magnetic mineral separation methods of magnetic seed circulating reinforced flocculation magnetic separation, raw material is broken to grinding ore to the fineness of-75µm content 60%-90%, ore powder is configured into ore pulp, 100-400 grams / ton of magnetic seed is added to ore pulp, at the speed of 700-1500rpm Realize selective flocculation, and the flocculation of ore pulp is given to high gradient magnetic separator, under the action of magnetic force, surface attachment magnetic seed's manganese mineral flocculation is selectively adsorbed to the surface of magnetic separation drum, and is collected after scraping plate, and it is manganese concentrate, and non-magnetic or weak magnetic gangue mineral is discharged as tailings with ore pulp flow, and high-grade manganese minerals are efficiently separated by using permanent magnet cylinder type magnetic separator to process manganese-loaded magnetic seed.The present application solves the problems of low recovery rate, complex process, poor recovery effect of micro-fine particles and high environmental risk faced by the current industry, significantly improves the manganese recovery rate and concentrate grade, and realizes the maximum utilization of manganese resources in tailings.

Description

Technical Field

[0001] This invention belongs to the technical field of mineral processing engineering, specifically relating to a highly efficient and green separation method for weakly magnetic minerals using magnetic seed circulation enhanced flocculation and magnetic separation, and particularly a new beneficiation technology for enhancing the recovery of low-grade high-clay manganese carbonate ore through magnetic seed circulation synergistic flocculation-magnetic separation. This method is also applicable to the efficient removal and upgrading of weakly magnetic minerals in ores such as phosphate rock and bauxite. Background Technology

[0002] High-clay, low-grade manganese carbonate ore is an important component of manganese resources, and its efficient development and utilization are of great significance to ensuring the supply of national strategic resources. However, due to the special mineralogical properties of this type of ore (such as high mudification, low grade, and uneven grain size), traditional beneficiation technologies face severe challenges in achieving economical and efficient recovery. The core dilemmas are mainly reflected in three dimensions: resource recovery, process flow, and environmental benefits.

[0003] Currently, traditional magnetic separation and flotation processes for processing such ores generally suffer from the dual problems of low resource recovery efficiency and significant environmental pressure. The enrichment effect and overall recovery rate of these processes are unsatisfactory, resulting in a large amount of valuable rhodochrosite failing to be effectively recovered and being lost with the tailings. This not only causes a serious waste of mineral resources but also results in insufficient source reduction of manganese slag during the beneficiation process, significantly increasing the storage capacity of tailings ponds and environmental risks.

[0004] Secondly, due to the complex occurrence of rhodochrosite with uneven particle size, existing technologies often have to employ lengthy, multi-stage separation processes to achieve effective separation. This complex process increases the difficulty of production management. Even more challenging is that, to compensate for insufficient separation efficiency, the process often relies on adding various and large quantities of chemical reagents, which undoubtedly directly increases production costs and brings additional environmental pressure due to the increased difficulty of subsequent wastewater treatment.

[0005] Furthermore, existing technologies face significant bottlenecks in the recovery of fine-grained minerals. Conventional physical separation methods (such as gravity separation and traditional magnetic separation) are ineffective in capturing and enriching finely disseminated rhodochrosite particles, creating a technological blind spot in recovery. The loss of this portion of resources severely restricts the breakthrough of the overall resource recovery rate ceiling.

[0006] In summary, traditional magnetic separation and flotation processes face significant challenges in the beneficiation of high-clay, low-grade manganese carbonate ores. Their main drawbacks are: First, the processes suffer from low enrichment efficiency and low overall recovery rates, resulting in the loss of large quantities of rhodochrosite with the tailings. This not only leads to severe resource waste but also exacerbates the pressure on slag storage and environmental risks due to insufficient reduction of manganese slag at the source. Second, due to the uneven distribution of rhodochrosite particles, existing technologies often rely on lengthy, multi-stage beneficiation processes, which are complex to manage. Furthermore, achieving targets requires the addition of various large quantities of reagents, increasing production costs and creating serious wastewater treatment challenges. In addition, conventional physical separation methods are ineffective in capturing fine-grained rhodochrosite, creating a technological blind spot that restricts the improvement of overall resource recovery. Therefore, developing a new beneficiation technology or optimized process that can achieve high recovery rates, simple processes, controllable costs, and environmental friendliness has become an urgent need to address the bottlenecks in the resource utilization of high-clay, low-grade manganese carbonate ores and promote the green and sustainable development of the industry. Summary of the Invention

[0007] The purpose of this invention is to overcome the shortcomings of existing technologies in processing high-clay and low-grade manganese carbonate ores, and to provide a highly efficient separation method based on magnetic seed flocculation, namely a weak magnetic mineral separation method using magnetic seed circulation enhanced flocculation magnetic separation, which solves the problems currently faced by the industry such as low recovery rate, complex process, poor recovery effect of fine particles and high environmental risk.

[0008] To achieve the above-mentioned objectives, the technical solution of the present invention is as follows:

[0009] A method for separating weakly magnetic minerals using magnetic seed circulation enhanced flocculation magnetic separation includes the following steps: S1. Slurry preparation: High-clay type low-grade manganese carbonate ore is used as raw material. After crushing, it is ground into a fineness of -75µm content of 60%-90%. Then, the ground ore powder is prepared into a slurry with a mass concentration of 20%-30% and transferred to a mixing tank for later use. S2. Magnetic Seed Addition and Selective Flocculation: Add 100-400 g / ton of magnetic seed (such as magnetite, ferrosilicon, etc.) to the prepared slurry based on the dry ore mass; start the mixer and stir continuously at 700-1500 rpm for 3-5 minutes; this process aims to promote effective collision and selective flocculation between the magnetic seed and the fine manganese minerals in the ore through sufficient fluid shear force, forming magnetic agglomerates that are easy to magnetically separate; the magnetic seed added in this step can be fresh magnetic seed or magnetic seed regenerated in step S4; S3. Magnetic separation: The flocculated slurry is fed into a high-gradient magnetic separator at a constant flow rate of 1.5-2.5 cm / s, with a magnetic field strength ranging from 1.0 to 1.4 T. Under the action of magnetic force, manganese mineral flocs with magnetic seeds attached to their surface are selectively adsorbed onto the surface of the magnetic separator drum and collected by a scraper to obtain manganese concentrate. Non-magnetic or weakly magnetic gangue minerals are discharged as tailings with the slurry flow. S4. Magnetic Seed Regeneration and Reuse: Manganese-loaded magnetic seeds are processed using a permanent magnet drum separator with a magnetic field strength of 0.20-0.25T, a slurry concentration of 25%-35%, and a drum rotation speed of 25-30 r / min. This achieves efficient separation of magnetic seeds from high-grade manganese minerals. The cleaned magnetic seeds recovered can be directly returned to step S2 for recycling, thus forming a closed-loop cycle of magnetic seed addition, flocculation, magnetic separation, regeneration, and reuse.

[0010] The magnetic separation consists of one coarse and one scavenging step. Step S3 involves feeding the slurry that has been flocculated in step 2 into a high-gradient magnetic separator during the coarse separation.

[0011] A method for separating weakly magnetic minerals using magnetic seed circulation enhanced flocculation magnetic separation includes the following steps: S1. Slurry preparation: High-clay type low-grade manganese carbonate ore is used as raw material. After crushing, it is ground into a fineness of -75µm content of 60%-90%. Then, the ground ore powder is prepared into a slurry with a mass concentration of 20%-30% and transferred to a mixing tank for later use. S21. Magnetic separation: Magnetic separation is used for roughing. The prepared slurry is fed into a high-gradient magnetic separator at a constant flow rate of 1.5 to 2.5 cm / s, and the magnetic field strength ranges from 1.0 to 1.4 T. Under the action of magnetic force, roughing is used to obtain rough manganese concentrate and roughing tailings. S2. Magnetic Seed Addition and Selective Flocculation: Add 100-400 g / ton of magnetic seed (such as magnetite, ferrosilicon, etc.) to the roughing tailings by dry ore mass; start the mixer and stir continuously at 700-1500 rpm for 3-5 minutes. S3. Magnetic separation: The magnetic separation is a scavenging process. The flocculated slurry is fed into a high-gradient magnetic separator at a constant flow rate of 1.5 to 2.5 cm / s, and the magnetic field strength ranges from 1.0 to 1.4 T. Under the action of magnetic force, the scavenging process yields manganese concentrate with magnetic seeds attached to the surface and scavenged tailings. S4. Magnetic Seed Regeneration and Reuse: Manganese-loaded magnetic seeds are processed using a permanent magnet drum separator with a magnetic field strength of 0.20-0.25T, a slurry concentration of 25%-35%, and a drum rotation speed of 25-30 r / min. This achieves efficient separation of magnetic seeds from high-grade manganese minerals. The cleaned magnetic seeds recovered can be directly returned to step S2 for recycling, thus forming a closed-loop cycle of magnetic seed addition, flocculation, magnetic separation, regeneration, and reuse.

[0012] By adopting the above scheme, this invention systematically overcomes the key shortcomings of existing technologies in the beneficiation of high-clay, low-grade, fine-grained disseminated manganese carbonate ore, such as low recovery rate, insufficient collection capacity for fine-grained minerals, complex process flow, high reagent cost, and significant environmental risks associated with tailings. Based on a combination of magnetic seed flocculation and high-gradient magnetic separation, this invention achieves a significant improvement in beneficiation efficiency through synergistic optimization of key process parameters, while also possessing environmental friendliness and industrial application potential. By controlling the synergistic effects of magnetic seed dosage and addition location, grinding fineness, and magnetic field strength, this invention significantly improves manganese recovery rate and concentrate grade while maximizing the utilization of manganese resources in tailings and effectively reducing the generation of hazardous solid waste at the source. Attached Figure Description

[0013] Figure 1 This is a flowchart of an embodiment of the present invention involving the addition of magnetic seeds during the rough selection process; Figure 2 This is a flowchart of an embodiment of the present invention involving the addition of magnetic seeds during scanning. Detailed Implementation

[0014] This invention utilizes the selective flocculation effect of magnetic seeds to efficiently capture easily lost fine-grained rhodochrosite, steadily increasing the total manganese recovery rate to over 90% and significantly reducing resource waste. By optimizing magnetic seed flocculation, the mineral processing steps and management complexity are simplified. Using magnetic seeds as a carrier overcomes the blind spots in the recovery of fine-grained minerals in existing technologies, enabling their efficient recovery by conventional magnetic separation equipment. Ultimately, this invention aims to develop a simple, efficient, and recyclable green process that reduces production costs, wastewater treatment difficulties, and the risk of secondary environmental pollution from the source, providing a reliable technical solution for the efficient and green comprehensive utilization of high-clay, low-grade manganese carbonate ores.

[0015] A general implementation process of the method of the present invention is as follows: Figure 1 As shown, based on the original coarse and fine sweep process, a magnetic seed regeneration and reuse step is added during the coarse selection, significantly reducing operating costs. The process mainly includes the following steps: Step S1, Slurry Preparation: High-clay type low-grade manganese carbonate ore is used as raw material. After crushing, it is ground to a fineness of 60% to 90% -75μm content using a mill. Subsequently, the ground ore powder is prepared into a slurry with a mass concentration of 20%-30% and transferred to a mixing tank for later use.

[0016] Step S2, Magnetic Seed Addition and Selective Flocculation: Add 100-400 g / ton (based on dry ore mass) of magnetic seed (such as magnetite, ferrosilicon, etc.) to the prepared slurry. Start the mixer and stir continuously at 700-1500 rpm for 3-5 minutes. This process aims to promote effective collision and selective flocculation of the magnetic seed with the fine-grained manganese minerals in the ore through sufficient fluid shear force, forming magnetic agglomerates that are easy to magnetically separate. The magnetic seed added in this step can be fresh magnetic seed or magnetic seed regenerated in step 4.

[0017] Step S3, Magnetic Separation: The flocculated slurry is fed into a high-gradient magnetic separator at a constant flow rate (magnetic field strength range of 1.0-1.4T, constant flow rate of 1.5-2.5cm / s). Under the action of magnetic force, manganese mineral flocs with magnetic seeds attached to their surface are selectively adsorbed onto the surface of the magnetic separator drum and collected by the scraper to obtain manganese concentrate; while non-magnetic or weakly magnetic gangue minerals are discharged as tailings with the slurry flow.

[0018] Step S4, Magnetic Seed Regeneration and Reuse: A permanent magnet drum separator is used to process the manganese-loaded magnetic seeds. The magnetic field strength is 0.20-0.25T; the slurry concentration is 25%-35%; and the drum rotation speed is 25-30 r / min, achieving efficient separation of the magnetic seeds from high-grade manganese minerals. The recovered clean magnetic seeds can be directly returned to step S2 for recycling, thus forming a closed-loop cycle of magnetic seed addition-flocculation-magnetic separation-regeneration-reuse, fundamentally reducing the unit consumption of magnetic seeds.

[0019] Alternatively, as shown in Figure 2, this process adds a magnetic seed regeneration and reuse unit to the scavenging step, based on the traditional "roughing and scavenging" process. After a large amount of manganese concentrate is pre-enriched and recovered in the roughing operation, the amount of roughing tailings to be processed is relatively reduced, and the amount of magnetic seed added can be reduced accordingly, thereby effectively reducing production and operating costs and resulting in more significant economic benefits. The process mainly includes the following steps: Step S1, and Figure 1 Similarly, slurry preparation: High-clay type low-grade manganese carbonate ore is used as raw material. After crushing, it is ground to a fineness of -75µm content of 60%-90%. Then, the ground ore powder is prepared into a slurry with a mass concentration of 20%-30% and transferred to a mixing tank for later use.

[0020] Step S21, Magnetic separation: Magnetic separation is the roughing process. The prepared slurry is fed into a high gradient magnetic separator at a constant flow rate of 1.5 to 2.5 cm / s, and the magnetic field strength ranges from 1.0 to 1.4 T. Under the action of magnetic force, the roughing process yields rough manganese concentrate and rough tailings.

[0021] Step S2, Magnetic Seed Addition and Selective Flocculation: Add 100-400 g / ton of magnetic seed (such as magnetite, ferrosilicon, etc.) to the roughing tailings by dry ore weight; start the mixer and stir continuously at 700-1500 rpm for 3-5 minutes; this process aims to promote effective collision and selective flocculation of the magnetic seed with the fine-grained manganese minerals in the ore through sufficient fluid shear force, forming magnetic agglomerates that are easy to magnetically separate. The magnetic seed added in this step can be fresh magnetic seed or magnetic seed regenerated in step 4.

[0022] S3. Magnetic separation: The magnetic separation is a scavenging process. The flocculated slurry is fed into a high-gradient magnetic separator at a constant flow rate of 1.5-2.5 cm / s, with a magnetic field strength ranging from 1.0 to 1.4 T. Under the action of magnetic force, manganese mineral flocs with magnetic seeds attached to their surfaces are selectively adsorbed onto the surface of the magnetic separator drum and collected by a scraper to become manganese concentrate (loaded with manganese magnetic seeds). Non-magnetic or weakly magnetic gangue minerals are discharged as tailings with the slurry flow.

[0023] S4. Magnetic Seed Regeneration and Reuse: Manganese-loaded magnetic seeds are processed using a permanent magnet drum separator with a magnetic field strength of 0.20-0.25T, a slurry concentration of 25%-35%, and a drum rotation speed of 25-30 r / min. This achieves efficient separation of magnetic seeds from high-grade manganese minerals. The cleaned magnetic seeds recovered can be directly returned to step S2 for recycling, thus forming a closed-loop cycle of magnetic seed addition, flocculation, magnetic separation, regeneration, and reuse.

[0024] Example 1: Optimization effect of magnetic seed dosage of 200g / t For high-clay, low-grade manganese carbonate ore with a manganese grade of 11.88%, selective flocculation using 200 g / t magnetic seed was employed under the condition that the grinding fineness was -75 μm, accounting for 64.20%. This was combined with a coarse (1.0 T) and scavenger (1.4 T) magnetic separation process, achieving a concentrate manganese grade of 18.77% and a manganese recovery rate of 90.03%. Simultaneously, the manganese grade in the tailings was effectively controlled at 2.75%, with a source slag reduction rate of 43.03%. Compared with traditional processes, the 200 g / t magnetic seed dosage not only demonstrates the potential for a simpler process and the recyclability of the magnetic seed, but also shows significant advantages in reducing reagent consumption and environmental impact. This preliminary verification demonstrates the feasibility and comprehensive benefits of this combined magnetic seed flocculation-magnetic separation process for treating low-grade manganese carbonate ore.

[0025] Example 2: Enhancement effect of magnetic seed dosage of 300g / t For high-clay, low-grade manganese carbonate ore with a manganese grade of 11.89%, the magnetic seed dosage was increased to 300 g / t for selective flocculation, while maintaining a coarse (1.0T) and scavenger (1.4T) magnetic separation process, based on a grinding fineness of -75 μm accounting for 64.20%. The results showed that appropriately increasing the magnetic seed dosage significantly enhanced the collection capacity for fine-grained manganese minerals: the concentrate manganese grade increased to 18.71%, the manganese recovery rate increased to 91.48%, the tailings manganese grade further decreased to 2.42%, and the source slag reduction rate reached 41.87%. These results validate that increasing the magnetic seed dosage within a reasonable range helps reduce metal loss and improve the overall resource recovery efficiency, providing a basis for optimizing the beneficiation process of low-grade manganese ore.

[0026] Example 3: Peak recovery effect with a magnetic seed dosage of 400 g / t This embodiment uses high-clay, low-grade manganese carbonate ore with a manganese grade of 11.98% as the treatment target. Under the conditions of a fixed grinding fineness of -75μm (64.20%) and a coarse (1.0 T) and scavenging (1.4 T) magnetic separation process, the magnetic seed dosage is increased to 400 g / t for selective flocculation. The results show that at this dosage, the system achieves peak recovery rates: the concentrate manganese grade reaches 18.22%, the manganese recovery rate is further increased to 93.25%, the tailings manganese grade is effectively reduced to 2.09%, and the source slag reduction rate reaches 38.70%. This set of data fully verifies that in the magnetic seed flocculation-magnetic separation process system, the magnetic seed dosage has a decisive regulatory role on the final recovery rate. Appropriately increasing the magnetic seed input can achieve more thorough capture of fine-grained manganese minerals, thereby maximizing resource recovery benefits.

[0027] Example 4: Enhanced scavenging effect of adding 100g / t of magnetic seed to roughing tailings For roughing tailings of high-clay, low-grade manganese carbonate ore with a manganese grade of 11.81%, while maintaining a grinding fineness of -75μm at 64.20% and a single roughing (1.0T) and scavenging (1.4T) magnetic separation process, adding 100g / t of magnetic seed to the scavenging operation effectively enhanced the magnetic responsiveness of fine-grained minerals. The final concentrate yielded 58.10% overall, with a manganese grade of 18.46%, achieving a comprehensive manganese recovery rate of 90.84%, and effectively controlling the manganese content in the tailings to 2.58%. These results confirm that magnetic seed-enhanced scavenging of roughing tailings can significantly recover residual fine-grained manganese minerals and is an effective means of reducing metal loss.

[0028] Example 5: Enhanced scavenging effect of adding 200g / t of magnetic seed to roughing tailings Based on the process in Example 4, the amount of magnetic seed used in the scavenging stage was increased to 200 g / t to process rougher tailings with a manganese grade of 11.87%, further optimizing the separation efficiency. Results showed that the overall concentrate yield increased to 60.08%, the manganese grade stabilized at 18.31%, the overall manganese recovery rate increased to 92.70%, while the source slag reduction rate reached 39.92%, and the manganese content in the tailings was as low as 2.17%. This process verifies that increasing the amount of magnetic seed used in scavenging can enhance the collection effect on residual fine-grained manganese minerals, providing a more efficient technical path for the resource utilization of tailings.

[0029] Example 6: Synergistic optimization effect of extending grinding fineness to -75μm, accounting for 87.92% Using high-clay and low-grade manganese carbonate ore with a manganese grade of 11.91% as the test object, under the conditions of a fixed magnetic seed dosage of 400 g / t and a coarse (1.0 T) and scavenger (1.4 T) magnetic separation process, the grinding fineness was increased to -75 μm, accounting for 87.92%. More thorough grinding significantly improved the liberation degree of mineral monomers, creating more adsorption active sites for selective flocculation by magnetic seed, resulting in a significant synergistic effect: the final concentrate manganese grade stabilized at 18.17%, the system manganese recovery rate achieved a breakthrough increase to 94.61%, while the tailings manganese grade was significantly reduced to 1.69%, and the source slag reduction rate reached 37.99%. These results fully verify the synergistic optimization effect of grinding fineness and magnetic seed flocculation process, enabling more thorough recovery of fine-grained manganese ore and providing a reliable technical path for maximizing the resource efficiency of low-grade and difficult-to-process manganese ore.

[0030] Examples of this invention involving the addition of magnetic seeds at different stages, different amounts of addition, and different grinding fineness, with manganese concentrate grades and recovery rates listed below.

[0031]

[0032] The results of Examples 1-3 show that, under the condition of adding magnetic seeds in the roughing stage, the manganese mineral recovery effect gradually improves with the increase of magnetic seed dosage. Examples 4-5 show that when magnetic seeds are added in the scavenging stage, the recovery effect also improves with the increase of magnetic seed dosage. Comparing Examples 1-5, it can be seen that since a large amount of manganese concentrate has been pre-enriched and recovered in the roughing operation before scavenging, the amount of roughing tailings is significantly reduced, so the amount of magnetic seeds added in the scavenging stage can be significantly reduced; and under the same magnetic seed dosage, the recovery effect of Example 5 is better than that of Example 1, indicating that adding magnetic seeds to the scavenging stage can achieve better manganese recovery indicators under lower dosage conditions. The results of Example 6 show that after increasing the grinding fineness to -75μm accounting for 87.92%, the slurry viscosity increases and the minerals are prone to mud formation, but a good recovery effect can still be obtained under the synergistic effect of magnetic seeds, which is conducive to further improving the resource recovery rate and reducing the amount of tailings and environmental impact.

[0033] This invention solves the technical bottlenecks of traditional mineral processing, such as low recovery rate, lengthy process flow, large reagent consumption, and significant environmental pressure caused by the high mud content, low grade, and fine and uneven particle size of useful minerals in the ore. It provides a new approach for the efficient and comprehensive utilization of such difficult-to-process manganese ore resources.

[0034] Compared with the prior art, the present invention exhibits the following beneficial effects: (1) Breakthrough improvement in recovery efficiency: By controlling the amount of magnetic seed and the grinding fineness, this invention achieves efficient collection of fine-grained manganese ore. Data from the examples show that, under optimal conditions (such as Example 6), the total manganese recovery rate can reach a breakthrough of 94.61%, which is more than 14 percentage points higher than the traditional sorting method (the recovery rate is often below 80%). This greatly reduces resource waste and fundamentally solves the core technical problem of easy loss of fine-grained minerals.

[0035] (2) Maximizing resource utilization and outstanding environmental friendliness: This invention not only achieves a high recovery rate, but also significantly reduces the manganese grade of the final tailings to below 2% (as low as 1.69%) through a closed-loop process of coarse and slag removal, which is far lower than the tailings grade of traditional processes (usually above 3%). At the same time, the slag reduction rate at the source (i.e., the final tailings yield) can be controlled at around 38% (e.g., 37.99% in Example 6). This not only reduces the emission of solid waste at the source and lowers the environmental risk and storage cost of manganese slag ponds, but also achieves the full utilization of ore resources, reflecting the concept of green mining.

[0036] (3) Significantly superior technical and economic advantages: While achieving a high recovery rate, this invention ensures that the manganese grade of the concentrate remains stable at over 18%, effectively guaranteeing the quality and market competitiveness of the final product. By introducing a magnetic seed regeneration and closed-loop circulation system, the invention achieves efficient recovery and reuse of magnetic seeds, significantly reducing the beneficiation cost per unit of ore and the consumption of magnetic seeds from the source. This innovation provides a practical and feasible technical path for the industrial and economical development of low-grade, difficult-to-process manganese carbonate ores, demonstrating significant cost-effectiveness advantages.

[0037] In summary, the technical solution provided by this invention effectively solves the beneficiation problem of high-clay, low-grade manganese carbonate ore, demonstrating technical advantages and application value in improving resource recovery rate, reducing environmental impact, and increasing economic benefits.

[0038] The embodiments described above are merely illustrative of the technical ideas and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. However, they do not limit the patent scope of the present invention. All equivalent changes or modifications made in accordance with the spirit disclosed in the present invention should still be covered within the patent scope of the present invention.

Claims

1. A method for separating weakly magnetic minerals using magnetic seed circulation enhanced flocculation magnetic separation, characterized in that... Includes the following steps: S1. Slurry preparation: High-clay type low-grade manganese carbonate ore is used as raw material. After crushing, it is ground into a fineness of -75µm content of 60%-90%. Then, the ground ore powder is prepared into a slurry with a mass concentration of 20%-30% and transferred to a mixing tank for later use. S2. Magnetic seed addition and selective flocculation: Add 100-400 g / ton of magnetic seed to the prepared slurry based on the dry ore mass; start the mixer and stir continuously at a speed of 700-1500 rpm for 3-5 minutes. S3. Magnetic separation: The flocculated slurry is fed into a high gradient magnetic separator at a constant flow rate, with a magnetic field strength ranging from 1.0 to 1.4T. Under the action of magnetic force, manganese mineral flocs with magnetic seeds attached to their surface are selectively adsorbed onto the surface of the magnetic separator drum and collected by a scraper to become manganese concentrate. Non-magnetic or weakly magnetic gangue minerals are discharged as tailings with the slurry flow. S4. Magnetic Seed Regeneration and Reuse: Using a permanent magnet drum separator to process manganese-loaded magnetic seeds to achieve efficient separation of magnetic seeds from high-grade manganese minerals.

2. A method for separating weakly magnetic minerals using magnetic seed circulation enhanced flocculation magnetic separation, characterized in that... Includes the following steps: S1. Slurry preparation: High-clay type low-grade manganese carbonate ore is used as raw material. After crushing, it is ground into a fineness of -75µm content of 60%-90%. Then, the ground ore powder is prepared into a slurry with a mass concentration of 20%-30% and transferred to a mixing tank for later use. S21. Magnetic separation: Magnetic separation is used for roughing. The prepared slurry is fed into a high-gradient magnetic separator at a constant flow rate, with a magnetic field strength ranging from 1.0 to 1.4T. Under the action of magnetic force, roughing yields rough manganese concentrate and rough tailings. S2. Magnetic seed addition and selective flocculation: Add 100-400 g / ton of magnetic seed to the roughing tailings based on dry ore mass; start the mixer and stir continuously at 700-1500 rpm for 3-5 minutes. S3. Magnetic separation: The magnetic separation is a scavenging process. The flocculated slurry is fed into a high-gradient magnetic separator at a constant flow rate, with a magnetic field strength ranging from 1.0 to 1.4T. Under the action of magnetic force, manganese mineral flocs with magnetic seeds attached to their surfaces are selectively adsorbed onto the surface of the magnetic separator drum and collected by a scraper to become scavenged manganese concentrate. Non-magnetic or weakly magnetic gangue minerals are discharged with the slurry flow as scavenged tailings. S4. Magnetic Seed Regeneration and Reuse: Using a permanent magnet drum separator to process manganese-loaded magnetic seeds to achieve efficient separation of magnetic seeds from high-grade manganese minerals.

3. The method for separating weakly magnetic minerals by magnetic seed circulation enhanced flocculation magnetic separation as described in claim 1 or 2, characterized in that: The magnetic seeds added in step S2 are fresh magnetic seeds.

4. A method for separating weakly magnetic minerals by magnetic seed circulation enhanced flocculation magnetic separation as described in claim 1 or 2, characterized in that: The magnetic seed added in step S2 is the same magnetic seed regenerated in step S4. The clean magnetic seed recovered in step S4 is directly returned to step S2 for recycling, forming a closed-loop cycle of magnetic seed addition-flocculation-magnetic separation-regeneration-reuse.

5. A method for separating weakly magnetic minerals by magnetic seed circulation enhanced flocculation magnetic separation as described in claim 1 or 2, characterized in that: The magnetic seed added in step S2 is magnetite and / or ferrosilicon.

6. A method for separating weakly magnetic minerals by magnetic seed circulation enhanced flocculation magnetic separation as described in claim 1 or 2, characterized in that: The constant flow rate of the slurry in step S3 is 1.5 to 2.5 cm / s.

7. A method for separating weakly magnetic minerals by magnetic seed circulation enhanced flocculation magnetic separation as described in claim 1 or 2, characterized in that: The magnetic field strength of the permanent magnet drum separator in step S4 is 0.20-0.25T; the slurry concentration is 25%-35%; and the drum rotation speed is 25-30r / min.

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