Superconducting magnetic separation-flotation combined beneficiation method for ultra-lean copper ore

Abstract

The invention discloses a superconducting magnetic separation-flotation combined beneficiation method for ultra-low-grade copper ore, which comprises the following steps: firstly, crushing the ultra-low-grade copper ore, carrying out first-stage ore grinding, then, carrying out weak magnetic iron removal, superconducting magnetic separation roughing and scavenging tailing discarding, then, carrying out second-stage ore grinding on first-stage pre-selected concentrate, and then, carrying out weak magnetic iron removal, superconducting magnetic separation roughing and scavenging tailing discarding. And finally, the second-section pre-selected concentrate is subjected to flotation to obtain final copper concentrate, wherein the flotation process structure is one-time roughing, three-time concentration and two-time scavenging. The highest magnetic field intensity of superconducting magnetic separation can reach 5T, the copper grade of the tailings can be greatly reduced, the copper metal recovery rate is improved, and the tailings discarding amount is large; the sodium silicate and the sodium hexametaphosphate are combined to be used as inhibitors of siliceous and magnesian gangue, and meanwhile, the sodium silicate and the sodium hexametaphosphate are also slurry dispersing agents and have a positive effect on improving the concentrate grade; the copper sulfide collecting agent Z200 and the copper oxide chelating collecting agent B130 are used in a combined mode, the synergistic effect of the agents is achieved, and the copper recovery rate is effectively increased.

Description

Technical Field

[0001] The invention belongs to the technical field of copper ore dressing, and specifically relates to a dressing process for ultra-poor copper ore, which is suitable for the separation of ultra-poor copper ore with a copper grade of less than 0.1%, and is particularly suitable for the separation of copper minerals with a copper grade between 0.07% and 0.1%, wherein the copper minerals are mainly copper sulfide and contain some copper oxide, and the gangue minerals contain easily muddy chlorite and talc. Background Art

[0002] With the rapid development of my country's electronics industry and new energy vehicles, the consumption of copper has increased year by year. It is difficult to meet the demand for copper in my country's industry with only high-grade copper resources. Therefore, the efficient development of low-grade copper mines, especially ultra-poor copper mines with a copper grade of less than 0.1%, is an important measure to ensure the development of my country's copper industry.

[0003] At present, a single flotation process is mainly used for low-grade copper ore. However, due to the low grade of the selected ore, the amount of flotation ore is large, the cost of mineral processing is high, and a large amount of gangue minerals are finely ground and muddied, which seriously deteriorates the flotation effect, resulting in a large amount of reagents used and complex types. For example, the Chinese invention patent "A method for beneficiating mud-containing gangue copper ore" (application number 202410694444.3) improves the flotation effect by adopting a complex reagent system. The sludge dispersants used include sodium carbonate, sodium hexametaphosphate, carboxymethyl cellulose and guar gum.

[0004] At present, there are few studies and applications on the pre-selection of low-grade copper ores, and they are mainly concentrated on X-ray intelligent pre-selection. For example, the Chinese invention patent "A method for pre-selection and enrichment of low-grade copper sulfide ore by X-ray radiation" (application number 201110343082.6) discloses a method for pre-selecting low-grade copper ores using X-rays. However, this method can only process coarse-grained ores with a particle size greater than 20 mm, and low-grade copper ores often require fine grinding to be effectively dissociated. Therefore, it is particularly important to develop a method for pre-selecting fine-grained copper ores.

[0005] Superconducting magnetic separation can generate extremely large induced current and magnetic field strength, which is sufficient to separate copper minerals from gangue, because the coil resistance is zero in the superconducting state. Therefore, if superconducting magnetic separation can be applied to copper ore pre-selection and combined with flotation technology, it will be expected to achieve energy-saving and efficient utilization of ultra-lean copper ore. Summary of the invention

[0006] The purpose of the present invention is to provide a superconducting magnetic separation-flotation combined beneficiation method for ultra-lean copper ore with large pre-selection tailings, high copper recovery rate, high efficiency and energy saving, in order to solve the technical problems existing in the existing ultra-lean copper ore flotation, such as large amount of reagents used, complex types, high energy consumption and the inability of low-grade copper ore pre-selection to be used for fine-grained copper ore pre-selection.

[0007] To achieve the above-mentioned purpose of the present invention, a superconducting magnetic separation-flotation combined beneficiation method for ultra-poor copper ore of the present invention is implemented by the following steps:

[0008] S1 crushing, one stage grinding - one stage weak magnetic separation for iron removal - one stage superconducting magnetic separation for roughing - one stage superconducting magnetic separation for scavenging

[0009] After crushing and grinding the ultra-lean copper ore, a weak magnetic separation is performed to remove iron to obtain a weak magnetic separation iron-removed concentrate and a weak magnetic separation iron-removed tailings; the tailings from the weak magnetic separation iron-removed are subjected to a superconducting magnetic roughing separation to obtain a superconducting magnetic roughing concentrate and a superconducting magnetic roughing tailings; the superconducting magnetic roughing tailings are subjected to a superconducting magnetic scavenging separation to obtain a superconducting magnetic scavenging concentrate and a superconducting magnetic scavenging tailings;

[0010] S2 two-stage grinding - two-stage weak magnetic separation for iron removal - two-stage superconducting magnetic separation for roughing - two-stage superconducting magnetic separation for sweeping

[0011] The first-stage superconducting magnetic separation roughing concentrate and the first-stage superconducting magnetic separation scavenging concentrate obtained in step S1 are combined and then subjected to second-stage grinding, and the second-stage grinding product is subjected to second-stage weak magnetic separation to remove iron, so as to obtain second-stage weak magnetic separation iron-removed concentrate and second-stage weak magnetic separation iron-removed tailings; the second-stage weak magnetic separation iron-removed tailings are subjected to second-stage superconducting magnetic separation roughing, so as to obtain second-stage superconducting magnetic separation roughing concentrate and second-stage superconducting magnetic separation roughing tailings; the second-stage superconducting magnetic separation roughing tailings are subjected to second-stage superconducting magnetic separation scavenging, so as to obtain second-stage superconducting magnetic separation scavenging concentrate and second-stage superconducting magnetic separation scavenging tailings;

[0012] S3 flotation operation

[0013] The two-stage superconducting magnetic separation roughing concentrate and the two-stage superconducting magnetic separation scavenging concentrate obtained in step S2 are combined as flotation feed, and each flotation operation selects to add inhibitor 1, inhibitor 2, activator, collector, and frother according to actual conditions, wherein the inhibitor 1 is a mixture of water glass and sodium hexametaphosphate, the inhibitor 2 is lime, the activator is sodium sulfide, the collector is a mixture of copper sulfide collector and copper oxide collector, and the frother is No. 2 oil; firstly, the flotation feed is subjected to flotation roughing to obtain flotation roughing concentrate and flotation roughing tailings; the flotation roughing concentrate is fed into flotation selection I to obtain flotation selection I concentrate and flotation selection I tailings; the flotation selection I concentrate is fed into flotation selection II to obtain flotation selection II concentrate and flotation selection II tailings; The flotation concentration II concentrate is fed into flotation concentration III to obtain flotation concentration III concentrate and flotation concentration III tailings, and the flotation concentration III concentrate is the final copper concentrate; the flotation roughing tailings are fed into flotation scavenging I to obtain flotation scavenging I concentrate and flotation scavenging I tailings, and the flotation scavenging I tailings are fed into flotation scavenging II to obtain flotation scavenging II concentrate and flotation scavenging II tailings; the flotation concentration I tailings, the flotation concentration II tailings, and the flotation scavenging I concentrate are combined and returned to the flotation roughing operation; the flotation concentration III tailings are returned to flotation concentration I, and the flotation scavenging II concentrate is returned to flotation scavenging I; the flotation scavenging II tailings are combined with the first-stage weak magnetic separation iron removal concentrate, the first-stage superconducting magnetic separation scavenging tailings of step S1, and the second-stage weak magnetic separation iron removal concentrate and the second-stage superconducting magnetic separation scavenging tailings of step S2 as the final tailings.

[0014] Preferably, in step S1, the first stage of grinding operation adopts a wet ball mill, and the grinding fineness is -0.076mm45%~65%; the first stage of weak magnetic separation and iron removal adopts a permanent magnet semi-countercurrent drum magnetic separator, and the magnetic field strength is 0.2~0.3T; the magnetic field strength of the first stage of superconducting magnetic separation is 4.0~4.5T, and the magnetic field strength of the first stage of superconducting magnetic separation is 4.5~5.0T.

[0015] Preferably, in step S2, the two-stage grinding operation adopts a wet ball mill, and the grinding fineness is -0.076mm80%~98%; the two-stage weak magnetic separation and iron removal adopts a permanent magnet semi-countercurrent drum magnetic separator, and the magnetic field strength is 0.2~0.3T; the magnetic field strength of the two-stage superconducting magnetic separation roughing is 4.0~4.5T, and the magnetic field strength of the two-stage superconducting magnetic separation scanning is 4.5~5.0T.

[0016] Preferably, in step S3, the inhibitor 1 is formed by mixing water glass and sodium hexametaphosphate in a mass ratio of 1:1, the inhibitor 2 is lime, the activator is sodium sulfide, the collector is formed by mixing copper sulfide collector Z200 and copper oxide chelate collector B130 in a mass ratio of 4:1, and the foaming agent is No. 2 oil.

[0017] Preferably, in step S3, the reagent system of the flotation roughing is: the dosage of inhibitor 1 is 40-60 g / t flotation feed, the dosage of inhibitor 2 is 2000-5000 g / t flotation feed, the dosage of activator is 200-400 g / t flotation feed, the dosage of collector is 30-50 g / t flotation feed, and the dosage of frother is 30-50 g / t flotation feed; the reagent system of flotation selection I is: the dosage of inhibitor 2 is 400-600 g / t flotation feed, the dosage of collector is 8- 14g / t flotation feed; the reagent system of flotation concentration II is: the dosage of inhibitor 2 is 200-400g / t flotation feed, the dosage of collector is 3-7g / t flotation feed; no reagent is added in flotation concentration III; the reagent system of flotation scavenging selection I is: the dosage of collector is 15-25g / t flotation feed, the dosage of frother is 13-18g / t flotation feed; the reagent system of flotation scavenging selection II is: the dosage of collector is 5-15g / t flotation feed, the dosage of frother is 5-10g / t flotation feed.

[0018] Preferably, in step S3, the flotation time of flotation roughing is 4 to 6 minutes, the flotation time of flotation selection I is 3 to 5 minutes, the flotation time of flotation selection II is 2 to 4 minutes, the flotation time of flotation selection III is 1 to 3 minutes, the flotation time of flotation scavenging I is 2 to 4 minutes, and the flotation time of flotation scavenging II is 1 to 3 minutes.

[0019] Preferably, in step S1, the first stage superconducting magnetic separation roughing and the first stage superconducting magnetic separation scavenging both adopt JM-X-750 industrial superconducting magnetic separator; in step S2, the second stage superconducting magnetic separation roughing and the second stage superconducting magnetic separation scavenging also adopt JM-X-750 industrial superconducting magnetic separator.

[0020] Compared with the prior art, the superconducting magnetic separation-flotation combined beneficiation method of ultra-poor copper ore of the present invention has the following beneficial effects:

[0021] (1) The maximum magnetic field strength of ordinary high-intensity magnetic separation is only about 1.4T, while the maximum magnetic field strength of the superconducting magnetic separation used in the present invention can reach 5T, which can greatly reduce the copper grade of tailings and improve the recovery rate of copper metal.

[0022] (2) Compared with the single flotation process, the present invention adopts superconducting magnetic separation to discard tailings, which not only greatly reduces the amount of ore in the second stage grinding and flotation, improves the flotation grade, saves reagents and water and electricity consumption, but also removes a large amount of ore mud that is harmful to flotation through superconducting magnetic separation, not only greatly reduces the amount of flotation reagents, but also significantly improves the flotation effect.

[0023] (3) The present invention uses water glass and sodium hexametaphosphate in combination as inhibitors of siliceous and magnesian gangue. At the same time, both are also sludge dispersants, which have a positive effect on improving the concentrate grade. In view of the fact that the ore contains some copper oxide, the copper sulfide collector Z200 and the copper oxide chelate collector B130 are used in combination to exert the synergistic effect of the agents and effectively improve the copper recovery rate.

[0024] (4) The present invention combines the tailing discarding advantage of superconducting magnetic separation with the quality improvement advantage of flotation, taking advantage of their strengths and making up for their weaknesses, thereby achieving energy-saving and efficient utilization of ultra-lean copper ore.

[0025] (5) Studies have shown that for copper sulfide and copper oxide composite ore with a copper grade of 0.07%-0.1%, the method of the present invention can be used for separation to obtain copper concentrate with a copper grade of more than 16.0% and a copper recovery rate of more than 75.0%, achieving unexpected technical effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 The present invention is a process flow chart of one stage of grinding - magnetic separation and tailings discarding of an embodiment of a superconducting magnetic separation - flotation combined beneficiation method for ultra-lean copper ore.

[0027] Figure 2 The present invention is a two-stage grinding-magnetic separation tailings discarding process flow chart of an embodiment of a superconducting magnetic separation-flotation combined beneficiation method for ultra-lean copper ore of the present invention.

[0028] Figure 3 The present invention is a flotation process flow chart of an embodiment of a superconducting magnetic separation-flotation combined beneficiation method for ultra-lean copper ore.

[0029] Figure 4 The present invention is a process flow chart of the principle of a superconducting magnetic separation-flotation combined beneficiation method for ultra-lean copper ore.

[0030] Figure 5 The present invention is a process flow chart of an embodiment of a superconducting magnetic separation-flotation combined beneficiation method for ultra-lean copper ore. DETAILED DESCRIPTION

[0031] To further describe the present invention, the following is a detailed description of a superconducting magnetic separation-flotation combined beneficiation method for ultra-poor copper ore of the present invention in combination with the accompanying drawings and embodiments. However, the present invention is not limited to the embodiments. This embodiment uses ultra-poor copper ore from a domestic mine. The multi-element analysis results of the ore are shown in Table 1, and the copper phase analysis results are shown in Table 2.

[0032] Analysis shows that the copper grade of the ore is 0.091%, mainly copper sulfide, and also contains some copper oxide. The copper-containing minerals in the ore are mainly chalcopyrite and bornite, with a small amount of chalcocite, malachite, azurite, etc. The iron-containing minerals are mainly a small amount of magnetite, hematite, pyrrhotite, pyrite, etc. The non-metallic minerals are mainly quartz, chlorite, talc, etc., followed by amphibole, dolomite, calcite and magnesite, and a small amount of albite, etc. The ore not only has a very low copper grade, but also contains a large amount of chlorite, talc and other gangue that are easy to mud, and the direct flotation effect after grinding is very poor.

[0033] Table 1 Results of multi-element analysis of raw ore (%)

[0034] element Cu Co Fe <![CDATA[SiO2]]> <![CDATA[Al2O3]]> CaO MgO MnO content 0.092 0.001 5.26 63.45 13.8 7.63 6.47 0.044 element <![CDATA[TiO2]]> P <![CDATA[Na2O]]> <![CDATA[K2O]]> ZnO NiO S content 0.087 0.022 0.06 0.384 <0.005 0.098 0.73

[0035] Table 2 Results of analysis of copper phase in raw ore (%)

[0036] Phase Name Free Oxidized Copper Combined copper oxide Secondary copper sulfide Native copper sulfide total Copper content 0.017 0.006 0.012 0.057 0.092 Distribution rate 18.68 6.59 13.19 61.54 100.00

[0037] Depend on Figure 5 The process flow chart of the embodiment of the superconducting magnetic separation-flotation combined beneficiation method for ultra-poor copper ore of the present invention is shown in combination with Figure 1 , Figure 2 , Figure 3 , Figure 4 It can be seen that the present invention is implemented according to the following process steps in the embodiments:

[0038] 1) After crushing and grinding the ultra-poor copper ore with a copper grade of 0.092%, a weak magnetic separation is performed to remove iron, and a weak magnetic separation iron removal concentrate and a weak magnetic separation iron removal tailings are obtained. The tailings of the weak magnetic separation iron removal are subjected to a superconducting magnetic separation roughing, and a superconducting magnetic separation roughing concentrate and a superconducting magnetic separation roughing tailings are obtained. The tailings of the superconducting magnetic separation roughing are subjected to a superconducting magnetic separation scavenging, and a superconducting magnetic separation scavenging concentrate and a superconducting magnetic separation scavenging tailings are obtained. One of the grinding operations uses a wet ball mill with a grinding fineness of -0.076mm55%; the weak magnetic separation iron removal uses a permanent magnet semi-countercurrent drum magnetic separator with a magnetic field strength of 0.2T; the superconducting magnetic separator uses a JM-X-750 industrial superconducting magnetic separator, and the magnetic field strength of the superconducting magnetic separation roughing is 4.5T, and the magnetic field strength of the superconducting magnetic separation scavenging is 5.0T.

[0039] It can be seen from Table 3 that after the raw ore is subjected to a first stage of weak magnetic separation for iron removal - a first stage of superconducting magnetic separation for rough separation - a first stage of superconducting magnetic separation for scavenging and discarding of tailings, a first stage pre-selected comprehensive concentrate with a stage yield of 34.11%, a copper grade of 0.245% and a stage copper recovery rate of 91.19% and a first stage pre-selected comprehensive tailings with a stage yield of 65.89% and a copper grade of 0.012% can be obtained.

[0040] Table 3 Results of the first stage grinding-superconducting magnetic separation tailings test (%)

[0041]

[0042] 2) The first-stage pre-selected comprehensive concentrate obtained in step 1) is subjected to second-stage grinding, and the second-stage grinding product is subjected to second-stage weak magnetic separation to remove iron, to obtain second-stage weak magnetic separation iron-removed concentrate and second-stage weak magnetic separation iron-removed tailings. The second-stage iron-removed tailings are subjected to second-stage superconducting magnetic separation roughing to obtain second-stage superconducting magnetic separation roughing concentrate and second-stage superconducting magnetic separation roughing tailings. The second-stage superconducting magnetic separation roughing tailings are subjected to second-stage superconducting magnetic separation scavenging to obtain second-stage superconducting magnetic separation scavenging concentrate and second-stage superconducting magnetic separation scavenging tailings. The second-stage grinding operation adopts a wet ball mill with a grinding fineness of -0.076mm90%; the second-stage weak magnetic separation and iron removal adopts a permanent magnet semi-countercurrent drum magnetic separator with a magnetic field strength of 0.2T; the second-stage superconducting magnetic separator adopts a JM-X-750 industrial superconducting magnetic separator, the second-stage superconducting magnetic separation roughing magnetic field strength is 4.5T, and the second-stage superconducting magnetic separation scanning magnetic field strength is 5.0T.

[0043] It can be seen from Table 4 that after the first-stage pre-selection comprehensive concentrate is subjected to the second-stage weak magnetic separation for iron removal - the second-stage superconducting magnetic separation for rough selection - the second-stage superconducting magnetic separation for scavenging and discarding of tailings, the second-stage pre-selection comprehensive concentrate with a stage yield of 54.05%, a copper grade of 0.434% and a stage copper recovery rate of 95.80% and the second-stage pre-selection comprehensive tailings with a stage yield of 45.95% and a copper grade of 0.022% can be obtained.

[0044] Table 4 Second stage grinding - superconducting magnetic separation tailings test results (%)

[0045]

[0046] 3) The two-stage pre-selected comprehensive concentrate obtained in step 2) is used as flotation feed. Inhibitor 1, inhibitor 2, activator, collector and frother are added to each flotation operation according to the actual situation. First, flotation roughing is carried out to obtain flotation roughing concentrate and flotation roughing tailings. The flotation roughing concentrate is fed to flotation selection I to obtain flotation selection I concentrate and flotation selection I tailings. The flotation selection I concentrate is fed to flotation selection II to obtain flotation selection II concentrate and flotation selection II tailings. The flotation selection II concentrate is fed to flotation selection III to obtain flotation selection III concentrate (final copper concentrate) and flotation selection III tailings. The flotation roughing tailings are fed to flotation scavenging I to obtain flotation scavenging I concentrate and flotation scavenging I tailings. The flotation scavenging I tailings are fed to flotation scavenging II to obtain flotation scavenging II concentrate and flotation scavenging II tailings. The flotation selection I tailings, flotation selection II tailings, and flotation scavenging I concentrate are combined and returned to the flotation roughing operation. The flotation selection III tailings are returned to the flotation selection I operation. The flotation scavenging II concentrate is returned to the flotation scavenging I operation. The flotation scavenging II tailings, the first stage weak magnetic separation iron concentrate, the first stage superconducting magnetic separation scavenging tailings in step 1), and the second stage weak magnetic separation iron concentrate, and the second stage superconducting magnetic separation scavenging tailings in step 2) are combined as the final tailings.

[0047] The inhibitor 1 is made of water glass and sodium hexametaphosphate mixed in a mass ratio of 1:1, the inhibitor 2 is lime, the activator is sodium sulfide, the collector is made of Z200 (copper sulfide collector) and B130 (copper oxide chelate collector) mixed in a mass ratio of 4:1, and the frother is No. 2 oil. The reagent system of the flotation roughing is: inhibitor 1 dosage 50g / t flotation feed, inhibitor 2 dosage 3000g / t flotation feed, activator dosage 300g / t flotation feed, collector dosage 40g / t flotation feed, frother dosage 40g / t flotation feed; the reagent system of flotation selection I is: inhibitor 2 dosage 500g / t flotation feed, collector dosage 9g / t flotation feed; The reagent system of flotation selection II is: the dosage of inhibitor 2 is 300g / t flotation feed, the dosage of collector is 4.5g / t flotation feed; flotation selection III does not add reagents; the reagent system of flotation scavenging selection I is: the dosage of collector is 20g / t flotation feed, the dosage of frother is 15g / t flotation feed; the reagent system of flotation scavenging selection II is: the dosage of collector is 10g / t flotation feed, the dosage of frother is 7g / t flotation feed. The flotation time of the flotation roughing selection is 4.5min, the flotation time of flotation selection I is 3.5min, the flotation time of flotation selection II is 2.5min, the flotation time of flotation selection III is 1.5min, the flotation time of flotation scavenging selection I is 2.5min, and the flotation time of flotation scavenging selection II is 2min.

[0048] It can be seen from Table 5 that after flotation, the second-stage pre-selection comprehensive concentrate can obtain a flotation concentrate with a stage yield of 52.26%, a copper grade of 16.89%, and a stage copper recovery rate of 87.85%, as well as a flotation tailings with a stage yield of 97.74% and a copper grade of 0.054%.

[0049] Table 5 Flotation test results (%)

[0050] Product Name Yield Copper Grade Copper recovery rate Concentrate 2.26 16.89 87.85 Tailings 97.74 0.054 12.15 Feeding 100.00 0.434 100.00

[0051] As shown in Table 6, the full-process test of the ultra-lean copper ore can obtain a copper concentrate with a yield of 0.42%, a copper grade of 16.89%, and a copper recovery rate of 76.23%. For an ore with such a low copper grade, this index is satisfactory.

[0052] Table 6 Full process test results (%)

[0053] Product Name Yield Copper Grade Copper recovery rate Concentrate 0.42 16.89 76.23 Tailings 99.58 0.022 23.77 Feeding 100.00 0.092 100.00

[0054] The above are only preferred embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope defined by the claims.

Claims

1. A superconducting magnetic separation-flotation combined beneficiation method for ultra-poor copper ore, characterized in that Use the following steps: S1 crushing, one stage grinding - one stage weak magnetic separation for iron removal - one stage superconducting magnetic separation for roughing - one stage superconducting magnetic separation for scavenging After crushing and grinding the ultra-lean copper ore, a weak magnetic separation is performed to remove iron to obtain a weak magnetic separation iron-removed concentrate and a weak magnetic separation iron-removed tailings; the tailings from the weak magnetic separation iron-removed are subjected to a superconducting magnetic roughing separation to obtain a superconducting magnetic roughing concentrate and a superconducting magnetic roughing tailings; the superconducting magnetic roughing tailings are subjected to a superconducting magnetic scavenging separation to obtain a superconducting magnetic scavenging concentrate and a superconducting magnetic scavenging tailings; S2 two-stage grinding - two-stage weak magnetic separation for iron removal - two-stage superconducting magnetic separation for roughing - two-stage superconducting magnetic separation for sweeping The first-stage superconducting magnetic separation roughing concentrate and the first-stage superconducting magnetic separation scavenging concentrate obtained in step S1 are combined and then subjected to second-stage grinding, and the second-stage grinding product is subjected to second-stage weak magnetic separation to remove iron, so as to obtain second-stage weak magnetic separation iron-removed concentrate and second-stage weak magnetic separation iron-removed tailings; the second-stage weak magnetic separation iron-removed tailings are subjected to second-stage superconducting magnetic separation roughing, so as to obtain second-stage superconducting magnetic separation roughing concentrate and second-stage superconducting magnetic separation roughing tailings; the second-stage superconducting magnetic separation roughing tailings are subjected to second-stage superconducting magnetic separation scavenging, so as to obtain second-stage superconducting magnetic separation scavenging concentrate and second-stage superconducting magnetic separation scavenging tailings; S3 flotation operation The two-stage superconducting magnetic separation roughing concentrate and the two-stage superconducting magnetic separation scavenging concentrate obtained in step S2 are combined as flotation feed, and inhibitor 1, inhibitor 2, activator, collector, and frother are added according to actual conditions in each flotation operation, wherein the inhibitor 1 is a mixture of water glass and sodium hexametaphosphate, the inhibitor 2 is lime, the activator is sodium sulfide, the collector is a mixture of copper sulfide collector and copper oxide collector, and the frother is No. 2 oil; firstly, flotation roughing is performed on the flotation feed to obtain flotation roughing concentrate and flotation roughing tailings; the flotation roughing concentrate is fed into flotation concentration I to obtain flotation concentration I concentrate and flotation concentration I tailings; The flotation concentration I concentrate is fed into the flotation concentration II to obtain the flotation concentration II concentrate and the flotation concentration II tailings; The flotation concentration II concentrate is fed into the flotation concentration III to obtain the flotation concentration III concentrate and the flotation concentration III tailings, and the flotation concentration III concentrate is the final copper concentrate; Feed the flotation rougher tailings into flotation scavenging I to obtain flotation scavenging I concentrate and flotation scavenging I tailings, and feed the flotation scavenging I tailings into flotation scavenging II to obtain flotation scavenging II concentrate and flotation scavenging II tailings; Combine the flotation concentration I tailings, flotation concentration II tailings, and flotation scavenging I concentrate and return them to the flotation roughing operation; The flotation selection III tailings are returned to flotation selection I, and the flotation scavenging II concentrate is returned to flotation scavenging I; the flotation scavenging II tailings, the first-stage weak magnetic separation iron concentrate and the first-stage superconducting magnetic separation tailings of step S1, and the second-stage weak magnetic separation iron concentrate and the second-stage superconducting magnetic separation tailings of step S2 are combined as the final tailings.

2. The superconducting magnetic separation-flotation combined beneficiation method for ultra-poor copper ore according to claim 1, characterized in that: In step S1, the first stage of grinding operation adopts a wet ball mill with a grinding fineness of -0.076mm45%~65%; the first stage of weak magnetic separation and iron removal adopts a permanent magnet semi-countercurrent drum magnetic separator with a magnetic field strength of 0.2~0.3T; the magnetic field strength of the first stage of superconducting magnetic separation is 4.0~4.5T, and the magnetic field strength of the first stage of superconducting magnetic separation is 4.5~5.0T.

3. The superconducting magnetic separation-flotation combined beneficiation method for ultra-poor copper ore according to claim 1, characterized in that: In step S2, the two-stage grinding operation adopts a wet ball mill with a grinding fineness of -0.076mm80%~98%; the two-stage weak magnetic separation and iron removal adopts a permanent magnet semi-countercurrent drum magnetic separator with a magnetic field strength of 0.2~0.3T; the magnetic field strength of the two-stage superconducting magnetic separation roughing is 4.0~4.5T, and the magnetic field strength of the two-stage superconducting magnetic separation scanning is 4.5~5.0T.

4. The superconducting magnetic separation-flotation combined beneficiation method for ultra-poor copper ore according to claim 1, characterized in that: In step S3, the inhibitor 1 is formed by mixing water glass and sodium hexametaphosphate in a mass ratio of 1:1, the inhibitor 2 is lime, the activator is sodium sulfide, the collector is formed by mixing copper sulfide collector Z200 and copper oxide chelate collector B130 in a mass ratio of 4:1, and the foaming agent is No. 2 oil.

5. A superconducting magnetic separation-flotation combined beneficiation method for ultra-poor copper ore as claimed in claim 1, 2, 3 or 4, characterized in that: In step S3, the reagent system of the flotation roughing is: the dosage of inhibitor 1 is 40-60 g / t flotation feed, the dosage of inhibitor 2 is 2000-5000 g / t flotation feed, the dosage of activator is 200-400 g / t flotation feed, the dosage of collector is 30-50 g / t flotation feed, and the dosage of frother is 30-50 g / t flotation feed; the reagent system of flotation concentration I is: the dosage of inhibitor 2 is 400-600 g / t flotation feed, the dosage of collector is 8-14 g / t flotation feed; the reagent system of flotation concentration II is: the dosage of depressant 2 is 200-400g / t flotation feed, and the dosage of collector is 3-7g / t flotation feed; no reagent is added in flotation concentration III; the reagent system of flotation scavenging selection I is: the dosage of collector is 15-25g / t flotation feed, and the dosage of frother is 13-18g / t flotation feed; the reagent system of flotation scavenging selection II is: the dosage of collector is 5-15g / t flotation feed, and the dosage of frother is 5-10g / t flotation feed.

6. The superconducting magnetic separation-flotation combined beneficiation method for ultra-poor copper ore according to claim 5, characterized in that: In step S3, the flotation time of flotation roughing is 4 to 6 minutes, the flotation time of flotation selection I is 3 to 5 minutes, the flotation time of flotation selection II is 2 to 4 minutes, the flotation time of flotation selection III is 1 to 3 minutes, the flotation time of flotation scavenging I is 2 to 4 minutes, and the flotation time of flotation scavenging II is 1 to 3 minutes.

7. The superconducting magnetic separation-flotation combined beneficiation method for ultra-poor copper ore according to claim 5, characterized in that: In step S1, the first stage of superconducting magnetic separation roughing and the first stage of superconducting magnetic separation scavenging both adopt JM-X-750 industrial superconducting magnetic separator; in step S2, the second stage of superconducting magnetic separation roughing and the second stage of superconducting magnetic separation scavenging also adopt JM-X-750 industrial superconducting magnetic separator.

8. The superconducting magnetic separation-flotation combined beneficiation method for ultra-poor copper ore according to claim 2, characterized in that: In step S2, the second-stage grinding operation adopts a wet ball mill, and the grinding fineness is -0.076mm80%~98%; the second-stage weak magnetic separation and iron removal adopts a permanent magnetic semi-countercurrent drum magnetic separator, and the magnetic field strength is 0.2~0.3T; the magnetic field strength of the second-stage superconducting magnetic separation roughing is 4.0~4.5T, and the magnetic field strength of the second-stage superconducting magnetic separation scavenging is 4.5~5.0T; In step S3, the inhibitor 1 is formed by mixing water glass and sodium hexametaphosphate in a mass ratio of 1:1, the inhibitor 2 is lime, the activator is sodium sulfide, the collector is formed by mixing copper sulfide collector Z200 and copper oxide chelate collector B130 in a mass ratio of 4:1, and the frother is No. 2 oil; the reagent system of the flotation roughing is: the inhibitor 1 is used in an amount of 40-60g / t of flotation feed, the inhibitor 2 is used in an amount of 2000-5000g / t of flotation feed, the activator is used in an amount of 200-400g / t of flotation feed, the collector is used in an amount of 30-50g / t of flotation feed, and the frother is used in an amount of 30-50g / t of flotation feed; the reagent system of flotation selection I is: the inhibitor 2 is used in an amount of 400-600g / t of flotation feed, the collector is used in an amount of 8-14g / t flotation feed; the reagent system of flotation concentration II is: the dosage of inhibitor 2 is 200-400g / t flotation feed, and the dosage of collector is 3-7g / t flotation feed; no reagent is added in flotation concentration III; the reagent system of flotation scavenging selection I is: the dosage of collector is 15-25g / t flotation feed, and the dosage of frother is 13-18g / t flotation feed; the reagent system of flotation scavenging selection II is: the dosage of collector is 5-15g / t flotation feed, and the dosage of frother is 5-10g / t flotation feed; the flotation time of flotation roughing selection is 4-6min, the flotation time of flotation concentration I is 3-5min, the flotation time of flotation concentration II is 2-4min, the flotation time of flotation concentration III is 1-3min, the flotation time of flotation scavenging selection I is 2-4min, and the flotation time of flotation scavenging selection II is 1-3min.

9. The superconducting magnetic separation-flotation combined beneficiation method for ultra-poor copper ore according to claim 8, characterized in that: In step S1, the first stage of superconducting magnetic separation roughing and the first stage of superconducting magnetic separation scavenging both adopt JM-X-750 industrial superconducting magnetic separator; in step S2, the second stage of superconducting magnetic separation roughing and the second stage of superconducting magnetic separation scavenging also adopt JM-X-750 industrial superconducting magnetic separator.

Images