A method for hierarchical recycling and large-scale consumption of copper mine tailings

Abstract

The present invention discloses a method for the sequential recycling and large-scale consumption of copper mine tailings. The method of "flotation desulfurization - weak magnetic separation for iron removal - combined gravity and magnetic separation for mica separation - large-scale consumption of all tailings" is adopted. Through steps such as grinding, flotation desulfurization, weak magnetic separation for iron removal, screening and classification, gravity preconcentration, strong magnetic separation for fine selection, and large-scale consumption of all tailings, the recovery of valuable elements and the large-scale consumption of all tailings are realized. Non-ferrous metal mine tailings, especially copper mine tailings, which are difficult to be utilized on a large scale, are transformed into products such as iron concentrate, mica concentrate, and simulated stone that can be utilized with high value. It provides an economically feasible method for the large-scale consumption and high-value utilization of high-silicon copper mine tailings, is conducive to solving the resource waste and environmental pollution of copper mine tailings, and provides technical support for the comprehensive utilization of the same type of tailings in China.

Description

Technical Field

[0001] The present invention belongs to the technical field of copper tailings recovery and consumption, and particularly relates to a method for the step-by-step recovery and large-scale consumption of copper mine tailings. Background Art

[0002] With the large-scale development of mineral resources, a huge amount of mine solid waste - tailings has been generated. Recycling the useful components in the tailings and achieving the large-scale consumption of tailings can not only effectively alleviate the shortage of resources and improve the resource utilization efficiency, but also reduce the tailings storage, mitigate the environmental pollution caused by tailings, and maximize the avoidance of secondary geological disasters such as landslides and collapses.

[0003] Most of the tailings of metamorphic rock non-ferrous metal mines contain a large amount of mica resources, and most of them are stored in tailing ponds without being recycled. At present, the main method for mica recovery is flotation process. The flotation method requires long-chain amine cations and fatty acid anions as collectors. Mica, as a foam product, needs to go through three rough selections and two fine selections to effectively separate mica from gangue and obtain qualified mica concentrate. The flotation process requires the use of a large amount of chemical reagents, resulting in high production costs. Moreover, there are a large amount of residual reagents in the mica concentrate and tailings, and the wastewater treatment cost is high, which is not conducive to the consumption and utilization of tailings and does not meet the requirements of relevant national environmental protection and energy conservation and emission reduction policies.

[0004] At the same time, metal mine tailings contain a large amount of quartz and silicate minerals. Because the content of heavy metals such as Pb, As, and Cd in them exceeds the standard, when a large amount of them are used as building materials such as bricks and tiles, it is extremely easy to affect human health. Therefore, they can only be used in small amounts in the cement industry and building materials industry and cannot be consumed and utilized on a large scale.

[0005] The Chinese patent document with the publication number CN107583764A and the publication date of January 16, 2018 discloses a beneficiation method for recovering mica from copper mine tailings. It mainly recovers weakly magnetic mica minerals in copper mine tailings through a strong magnetic separation process. After classification, it is then purified and refined through a gravity separation process to obtain better mica concentrate products. The process flow structure is simple, but there is also a problem that the strong magnetic separation process enriches other strongly magnetic minerals, weakly magnetic minerals, and mica minerals into the concentrate product together, and it may not be possible to separate them in the subsequent gravity separation process.

[0006] In the "Research on the Resource Utilization of Tailings from a Copper Mine in the Panxi Region" and "Research on the Resource Disposal and Comprehensive Utilization of Certain Tailings" published by Yang Jinzhong in 2019, a method for the resource utilization of copper mine tailings was disclosed. After re-grinding the copper mine tailings, copper-sulfur flotation was carried out, followed by copper-sulfur separation to produce copper concentrate and sulfur concentrate. The flotation tailings were subjected to gravity separation to remove heavy metal minerals. After pre-concentrating mica minerals by high-intensity magnetic separation, gravity separation was carried out for refining to obtain mica concentrate; the tailings from high-intensity magnetic separation were roasted to prepare silicon fertilizer, which could reduce the tailings by more than 56%. Although this process had good effects, it still could not fully and scalably consume the tailings, and the utilization of silicon fertilizer was limited and could not be applied on a large scale.

[0007] The present invention discloses a method for the step-by-step recycling and large-scale consumption of copper mine tailings, including steps such as grinding, flotation, weak magnetic separation, classified gravity separation, high-intensity magnetic separation, and extrusion molding. In the present invention, copper and sulfur minerals in the tailings are removed by grinding and flotation, and strong magnetic iron concentrate is recovered by weak magnetic separation; after the iron ore tailings are classified, the fine-grained fraction is used as tailings, and the coarse-grained fraction is divided into 1-3 narrow grain sizes for gravity separation to pre-concentrate mica minerals and discard residual heavy metal minerals at the same time; the pre-concentrated mica concentrate is refined and purified by high-intensity magnetic separation technology; the tailings from mica high-intensity magnetic separation, gravity separation tailings, and the tailings discarded by classification are combined and then extrusion molded to obtain simulated stone materials. The process flow of the present invention has a simple structure, can achieve full-scale and large-scale consumption, is beneficial to solving the resource waste and environmental pollution of copper mine tailings, and provides technical support for the comprehensive utilization of the same type of non-ferrous metal tailings in China. Summary of the Invention

[0008] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a method for the step-by-step recycling and large-scale consumption of copper mine tailings. A new process of "flotation for sulfur removal - weak magnetic separation for iron removal - combined gravity separation and magnetic separation for mica selection - full-scale and large-scale consumption of tailings" is adopted for the recovery of valuable elements and the full-scale and large-scale consumption of tailings. Non-ferrous metal mine tailings that are difficult to be utilized on a large scale, especially copper mine tailings, are transformed into products such as strong magnetic iron concentrate, mica concentrate, and simulated stone materials that can be highly valued. It provides an economically feasible method for the full-scale and large-scale consumption and high-value utilization of high-silicon copper mine tailings, is beneficial to solving the resource waste and environmental pollution of copper mine tailings, and provides technical support for the comprehensive utilization of the same type of tailings in China.

[0009] The purpose of the present invention is achieved through the following technical solutions: A method for the step-by-step recycling and large-scale consumption of copper mine tailings, including the following steps:

[0010] S1. Grinding: Grind the copper tailings to a content of -0.075mm of 70-85%;

[0011] S2. Flotation: Carry out the flotation step on the ground copper tailings to obtain sulfide concentrate and sulfide flotation tailings;

[0012] S3. Low-intensity magnetic separation: The sulfide flotation tailings are subjected to magnetic separation to obtain iron concentrate and low-intensity magnetic tailings. Among them, the magnetic field intensity of the magnetic separation is 0.1 - 0.2 T;

[0013] S4. Screening and classification: The low-intensity magnetic tailings are screened and classified to obtain low-intensity magnetic tailings with a particle size range of -0.045 - 0.058 mm and +0.045 - 0.058 mm. The low-intensity magnetic tailings with a particle size range of +0.045 - 0.058 mm also need to be screened into 2 - 3 narrow particle size fractions of low-intensity magnetic tailings; Further, the specific particle size of each particle size fraction and the number of narrow particle size fractions into which the coarse particle size fraction is divided should be determined according to the measured particle size distribution data of the tailings to be processed and the specific test results;

[0014] S5. Heavy separation of narrow particle size fractions: The 2 - 3 narrow particle size fractions of low-intensity magnetic tailings are respectively subjected to pre-concentration by heavy separation to obtain mica rough concentrates of different particle size fractions and narrow particle size fraction heavy separation tailings. The mica concentrates of each particle size fraction are combined to obtain the total mica rough concentrate;

[0015] S6. High-intensity magnetic separation: The total mica rough concentrate is subjected to magnetic separation to obtain mica concentrate and high-intensity magnetic tailings. Among them, the magnetic field intensity of the magnetic separation is 0.7 - 1.4 T;

[0016] S7. Total consumption: The low-intensity magnetic tailings with a particle size range of -0.045 - 0.058 mm, narrow particle size fraction heavy separation tailings and high-intensity magnetic tailings are combined as the total tailings, which are mixed with Portland cement, pigments, additives and water and then made into simulated stone products by extrusion molding.

[0017] Further, in step S1, the equipment used for grinding is a mill, a semi-autogenous mill, a rod mill or a ball mill.

[0018] Further, in step S2, the flotation includes a rougher flotation step, a cleaner flotation step and a scavenger flotation step;

[0019] The rougher flotation step is: controlling the pulp density of the copper tailings after grinding to be 30 - 45%, adding 50 - 400 g / t of activator, 40 - 100 g / t of collector and 10 - 40 g / t of frother for flotation to obtain rougher concentrate and rougher tailings;

[0020] The cleaner flotation step is: subjecting the rougher concentrate to 1 - 5 times of blank cleaning to obtain sulfide concentrate and cleaner tailings. The cleaner tailings are returned as feed to the rougher flotation step;

[0021] The scavenger flotation step is: subjecting the rougher tailings to 1 - 2 times of scavenging, adding 10 - 30 g / t of collector and 10 - 20 g / t of frother each time, to obtain scavenger concentrate and sulfide flotation tailings. The scavenger concentrate is returned as feed to the rougher flotation step.

[0022] Further, in step S2, when 2 to 5 blank concentration operations are performed, in the flotation concentration step, the concentrate obtained from each blank concentration operation is used as the feed for the next blank concentration operation, and the concentrate obtained from the last blank concentration operation is the sulfide concentrate; the tailings obtained from each blank concentration operation are used as the feed and returned to the previous blank concentration operation, and the tailings obtained from the first blank concentration operation are the concentrated tailings. Or, when 1 blank concentration operation is performed, the sulfide concentrate and the concentrated tailings are directly obtained from the blank concentration operation.

[0023] Further, in step S2, when 2 scavenging operations are performed, in the flotation scavenging step, the tailings obtained from the first scavenging operation are used as the feed for the second scavenging operation, and the tailings obtained from the second scavenging operation are the sulfide flotation tailings; the concentrate obtained from the second scavenging operation is used as the feed and returned to the first scavenging operation, and the concentrate obtained from the first scavenging operation is the scavenging concentrate. Or, when 1 scavenging operation is performed, the scavenging concentrate and the sulfide flotation tailings are directly obtained from the scavenging operation.

[0024] Further, in step S2, the activator refers to a reagent having a strong activation ability for sulfur-containing minerals such as chalcopyrite, pyrite, and pyrrhotite, such as a combination of one or more of the common reagents of copper sulfate, ammonium sulfate, ammonium chloride, and sodium sulfide;

[0025] The collector refers to a common sulfide ore collector, such as a combination of one or more of butyl xanthate, xanthate, amyl xanthate, ammonium dibutyl dithiophosphate, ethyl thionocarbazide, ethyl propyl thionocarbamate (Z-200), and ethyl thionocarbazide propionitrile ester (ester 105);

[0026] The foaming agent includes No. 2 oil, pine oil, mixed fatty alcohols, methyl isobutyl carbinol (MIBC), ether alcohol industrial foaming agents, or phenolic industrial foaming agents.

[0027] Further, in step S4, the equipment used for screening and classification includes one or more of various industrial hydraulic cyclones, spiral classifiers, and high-frequency vibrating screens.

[0028] Further, in step S5, the equipment used for narrow particle size gravity separation includes one or more of various industrial shaking tables, cyclones, spiral concentrators, and spiral launders.

[0029] Further, in step S2 and / or step S6, the equipment used for magnetic separation includes wet high-intensity magnetic separators, including one or more of flat ring high-intensity magnetic separators, vertical ring high-intensity magnetic separators, flat ring high-gradient magnetic separators, and vertical ring high-gradient magnetic separators;

[0030] Further, in step S7, the mass ratio of the total tailings, Portland cement, pigment, additive, and water is: 30 to 40: 20 to 30: 1 to 5: 0.5 to 5: 20 to 40.

[0031] Further, in step S7, the additive is a resin-based curing additive, such as epoxy resin and acrylic resin; the pigment is one of iron oxide red, iron oxide yellow, iron oxide black and iron oxide brown.

[0032] The beneficial effects of the present invention are as follows:

[0033] 1. The method of "combined gravity separation and magnetic separation for mica separation" adopted by the present invention avoids the traditional flotation process, does not require the addition of any chemical agents, and the recycled water after pressure filtration of the concentrate and tailings can be recycled, without causing secondary pollution to the environment.

[0034] 2. The total tailings are used to prepare simulated stone by the full consumption process of directly extruding and molding followed by curing, avoiding the traditional process of roasting and molding when used as building materials such as cement and bricks and tiles, avoiding environmental pollution, reducing production costs, and facilitating the large-scale promotion of the process.

[0035] 3. The new process of "flotation desulfurization - weak magnetic separation for iron removal - combined gravity separation and magnetic separation for mica separation - full-scale consumption of tailings" adopted by the present invention for valuable element recovery and full-scale consumption of tailings can make good use of a large amount of metal mine silicate-type tailings resources that cannot be effectively recycled under the existing technical level. It can not only effectively alleviate the shortage of resources, improve the resource utilization efficiency, but also reduce the stockpile of tailings, which is beneficial to the improvement of the mine ecological environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a process flow chart of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0037] The technical solution of the present invention will be further described in detail below with reference to the drawings, but the protection scope of the present invention is not limited to the following description.

[0038] Example 1

[0039] For the copper tailings in a large domestic copper mine tailings pond, the content of silicate minerals such as quartz, feldspar, mica, and clay minerals is 82.34%, and the K2O content of mica is 3.20%. Using the process technology of the present invention, the following steps are carried out, such as Figure 1 :

[0040] (1) Grinding: The tailings pulp is subjected to closed-circuit grinding operation using a rod mill or a ball mill until the content of -0.075mm reaches 85.43%.

[0041] (2) Rough flotation operation: For the copper tailings pulp after grinding, the pulp concentration is controlled at 40%, and then copper sulfate 200g / t, butyl xanthate 60g / t, and No. 2 oil 20g / t are successively added for rough flotation operation to obtain rough concentrate and rough tailings.

[0042] (3) Flotation cleaning operation: Using the flotation roughing concentrate as raw material, three blank cleaning operations are carried out, and the tailings of each cleaning operation are successively returned to the previous operation.

[0043] (4) Flotation scavenging operation: Using the roughing tailings as the raw material for the scavenging operation, 20 g / t of butyl xanthate and 8 g / t of No. 2 oil are added for scavenging I, obtaining scavenging I concentrate and scavenging I tailings. The scavenging I concentrate is returned to the flotation roughing operation, and 10 g / t of butyl xanthate and 3 g / t of No. 2 oil are added to the scavenging I tailings for scavenging II operation, obtaining scavenging II concentrate and scavenging II tailings. The scavenging II concentrate is returned to the flotation scavenging I operation, and the scavenging II tailings enter the weak magnetic separation operation.

[0044] (5) Weak magnetic separation: Carry out weak magnetic separation under a magnetic field intensity of 0.1 T to obtain iron concentrate and weak magnetic tailings.

[0045] (6) Screening and classification: Carry out screening and classification through a high-frequency vibrating screen, dividing it into three particle sizes: -0.045 mm, +0.045 mm - 0.106 mm, and +0.106 mm; the yield of the -0.045 mm fine particle size is 27.56%, the mica content is 2.12%, and it does not enter the gravity separation operation and is directly removed as fine particle size tailings in advance;

[0046] (7) Narrow particle size gravity separation: Carry out shaking table gravity separation on the two narrow particle sizes of +0.045 mm - 0.106 mm and +0.106 mm respectively to obtain mica concentrates and tailings of the two particle sizes. The mica concentrates of each particle size are combined into mica rough concentrate and enter the subsequent strong magnetic separation refining operation.

[0047] (8) Strong magnetic separation: Use a vertical ring high-gradient magnetic separator to carry out strong magnetic cleaning on the gravity separation mica rough concentrate under a magnetic field intensity of 1.1 T to obtain strong magnetic mica concentrate and strong magnetic tailings; the strong magnetic mica concentrate is the final mica concentrate, and the strong magnetic tailings are combined with the narrow particle size gravity separation tailings and the screening and classification fine particle size tailings to form total tailings and then enter the full consumption operation.

[0048] (9) Full consumption: Mix 35 parts of total tailings, 30 parts of ordinary Portland cement, 4 parts of iron oxide brown, 3 parts of epoxy resin, and 28 parts of water, stir evenly, and extrude and form through stone preparation equipment such as a brick and stone integrated machine to make artificial stone.

[0049] Finally, copper-sulfur concentrate (copper grade 2.8%) with an S grade of 37.85% and an S recovery rate of 68.58% is obtained; mica concentrate powder products with a mica K2O content of 8.86% and a mica recovery rate of 37.51%; and artificial stone with a 28-day compressive strength of 64.0 MPa, a water absorption rate of 3.5%, and a softening coefficient of 0.85%.

[0050] Example 2

[0051] The copper tailings of a medium-sized copper mine in China contain 78.35% mica and other silicate minerals, among which the K2O content of mica is 4.12%. Using the process technology of the present invention, the following steps are carried out, as Figure 1 :

[0052] (1) Grinding: The tailings slurry is subjected to closed-circuit grinding using a rod mill or a ball mill until the content of -0.075mm reaches 80.25%.

[0053] (2) Rough flotation operation: For the copper tailings slurry after grinding, control the pulp density at 38%, and then successively add 200g / t of ammonium chloride, 70g / t of butyl xanthate, and 25g / t of No. 2 oil for rough flotation operation to obtain rough flotation concentrate and rough flotation tailings.

[0054] (3) Scavenging flotation operation: Using the rough flotation concentrate as raw material, conduct 4 blank scavenging flotation operations, and the scavenging tailings of each operation are successively returned to the previous operation.

[0055] (4) Cleaning flotation operation: Using the rough flotation tailings as the raw material for the cleaning flotation operation, add 25g / t of butyl xanthate and 8g / t of No. 2 oil for cleaning flotation I to obtain cleaning flotation I concentrate and cleaning flotation I tailings. The cleaning flotation I concentrate is returned to the rough flotation operation. Add 12g / t of butyl xanthate and 4g / t of No. 2 oil to the cleaning flotation I tailings for cleaning flotation II operation to obtain cleaning flotation II concentrate and cleaning flotation II tailings. The cleaning flotation II concentrate is returned to the cleaning flotation I operation, and the cleaning flotation II tailings enter the weak magnetic separation operation.

[0056] (5) Weak magnetic separation: Conduct weak magnetic separation at a magnetic field intensity of 0.12T to obtain iron concentrate and weak magnetic tailings.

[0057] (6) Screening and classification: Screen and classify through a high-frequency vibrating screen into three particle sizes: -0.058mm, +0.058mm - 0.150, and +0.150mm; the yield of the -0.058mm fine particle size is 31.22%, and the mica content is 2.35%. It does not enter the gravity separation operation and is directly removed as fine particle size tailings in advance;

[0058] (7) Narrow particle size gravity separation: Conduct shaking table gravity separation on the two narrow particle sizes of +0.058mm - 0.150 and +0.150mm respectively to obtain mica concentrates and tailings of the two particle sizes. The mica concentrates of each particle size are combined into mica rough concentrates and enter the subsequent strong magnetic separation refining operation.

[0059] (8) Strong magnetic separation: Use a vertical ring high-gradient magnetic separator to conduct strong magnetic refining on the gravity separation mica rough concentrates at a magnetic field intensity of 1.0T to obtain strong magnetic mica concentrates and strong magnetic tailings; the strong magnetic mica concentrates are the final mica concentrates, and the strong magnetic tailings are combined with the narrow particle size gravity separation tailings and the screening and classification fine particle size tailings to form total tailings and then enter the full consumption operation.

[0060] (9)Full consumption: Mix 40 parts of total tailings, 25 parts of ordinary Portland cement, 4 parts of iron oxide red, 4 parts of epoxy resin, and 27 parts of water, stir evenly, and extrude and form through stone preparation equipment such as a brick and stone integrated machine to make imitation stone.

[0061] Finally, copper sulfide concentrate (copper grade 4.2%) with an S grade of 39.24% and an S recovery rate of 64.37% is obtained; mica concentrate powder products with a mica K2O content of 8.92% and a mica recovery rate of 33.15%; and imitation stone with a 28-day compressive strength of 63.4 MPa, a water absorption rate of 3.7%, and a softening coefficient of 0.76%.

[0062] The above are only the preferred embodiments of the present invention. It should be understood that the present invention is not limited to the form disclosed herein, should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications, and environments, and can be changed within the scope of the concept described herein through the above teachings or the technology or knowledge in related fields. Any changes and modifications made by those skilled in the art without departing from the spirit and scope of the present invention shall fall within the protection scope of the appended claims of the present invention.

Claims

1. A method for the step-by-step recycling and large-scale consumption of copper mine tailings, characterized in that, It includes the following steps: S1. Grinding: Grinding the copper tailings to a content of -0.075mm of 70 - 85%; S2. Flotation: Conducting a flotation step on the ground copper tailings to obtain sulfide concentrate and sulfide flotation tailings; S3. Low-intensity magnetic separation: Conducting magnetic separation on the sulfide flotation tailings to obtain iron concentrate and low-intensity magnetic tailings, wherein the magnetic field intensity of the magnetic separation is 0.1 - 0.2T; S4. Screening and classification: Screening and classifying the low-intensity magnetic tailings to obtain low-intensity magnetic tailings of -0.045mm particle size grade and +0.045mm particle size grade, and screening the +0.045mm particle size grade of low-intensity magnetic tailings into 2 - 3 narrow particle size grades of low-intensity magnetic tailings; S5. Heavy separation of narrow particle size grades: Separately conducting pre-concentration by heavy separation on the 2 - 3 narrow particle size grades of low-intensity magnetic tailings to obtain mica rough concentrates of different particle size grades and narrow particle size grade heavy separation tailings, and combining the mica concentrates of each particle size grade to obtain the total mica rough concentrate; S6. High-intensity magnetic separation: Conducting magnetic separation on the total mica rough concentrate to obtain mica concentrate and high-intensity magnetic tailings, wherein the magnetic field intensity of the magnetic separation is 0.7 - 1.4T; S7. Total consumption: Combining the -0.045mm particle size grade of low-intensity magnetic tailings, narrow particle size grade heavy separation tailings and high-intensity magnetic tailings as the total tailings, and mixing them with Portland cement, pigments, additives and water, and then forming them into simulated stone products through extrusion molding; Among them, in step S2, the flotation includes a rough flotation step, a cleaning flotation step and a scavenging flotation step; The rough flotation step is: Controlling the pulp concentration of the ground copper tailings to be 30 - 45%, adding 50 - 400g / t of activator, 40 - 100g / t of collector and 10 - 40g / t of frother for flotation to obtain rough concentrate and rough tailings; The cleaning flotation step is: Conducting 1 - 5 times of blank cleaning on the rough concentrate to obtain sulfide concentrate and cleaning tailings, and returning the cleaning tailings as feed to the rough flotation step; The scavenging flotation step is: Conducting 1 - 2 times of scavenging on the rough tailings, adding 10 - 30g / t of collector and 10 - 20g / t of frother each time, to obtain scavenging concentrate and sulfide flotation tailings, and returning the scavenging concentrate as feed to the rough flotation step.

2. The method for hierarchical recycling and large-scale consumption of copper mine tailings according to claim 1, wherein In step S1, the equipment used for grinding includes a mill, a semi-autogenous mill, a rod mill or a ball mill.

3. A method for the hierarchical recycling and large-scale consumption of copper mine tailings according to claim 1, characterized in that, In step S2, the activator includes one or more of copper sulfate, ammonium sulfate, ammonium chloride and sodium sulfide; The collector includes butyl xanthate, and one or more of xanthate, amyl xanthate, ammonium dibutyl dithiophosphate, ethyl thionocarbazide, ethyl propyl thionocarbamate and ethyl thionocarbazide propionitrile ester; The frother includes No. 2 oil, pine oil, mixed fatty alcohols, methyl isobutyl carbinol, ether alcohol industrial frother or phenolic industrial frother.

4. A method for the hierarchical recycling and large-scale consumption of copper mine tailings according to claim 1, characterized in that In step S4, the equipment used for screening and classification includes one or more of a hydrocyclone, a spiral classifier and a high-frequency vibrating screen.

5. A method for stepwise recycling and large-scale consumption of copper mine tailings according to claim 1, characterized in that, In step S5, the equipment used for heavy separation of narrow particle size grades includes one or more of a shaking table, a hydrocyclone, a spiral separator and a spiral launder.

6. A method for the step-by-step recycling and large-scale consumption of copper mine tailings according to claim 1, characterized in that, In step S2 and / or step S6, the equipment used for magnetic separation includes a wet high-intensity magnetic separator, including one or more of a flat-ring high-intensity magnetic separator, a vertical-ring high-intensity magnetic separator, a flat-ring high-gradient magnetic separator, and a vertical-ring high-gradient magnetic separator.

7. A method for stepwise recycling and large-scale consumption of copper mine tailings according to claim 1, characterized in that, In step S7, the mass ratio of the total tailings, Portland cement, pigment, additive, and water is: 30 - 40: 20 - 30: 1 - 5: 0.5 - 5: 20 - 40.

8. A method for the hierarchical recycling and large-scale consumption of copper mine tailings according to claim 1, characterized in that, In step S7, the additive is epoxy resin; the pigment is one of iron oxide red, iron oxide yellow, iron oxide black, and iron oxide brown.

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