Method for improving magnetic separation effect of tailings obtained by flotation of sulfur-oxygen-copper-cobalt mixed ore

Abstract

A method for improving the magnetic separation effect of tailings obtained through sulfur-oxygen-copper-cobalt mixed ore flotation comprises the following steps that (1) tailings reagent removal is conducted, specifically, concentration reagent removal is conducted on the tailings obtained through sulfur-oxygen-copper-cobalt mixed ore flotation, and concentrated ore pulp is obtained; and (2) oxygenolysis: diluting the concentrated ore pulp, adding an oxidizing agent and / or filling air for decomposition treatment, and using the obtained ore pulp for magnetic separation. According to the method, free reagents in the flotation tailings are removed through concentration before magnetic separation, then reagents attached to the surface of ore in ore pulp are removed through oxygenolysis, the adverse effect of reagent residues in the ore pulp on magnetic separation is eliminated, the copper and cobalt recovery rate of magnetic separation is increased, meanwhile, COD of the tailing ore pulp is greatly reduced, and the recovery rate of copper and cobalt is increased. And the environmental pollution caused by the residual flotation reagent in the tailing discharge process is effectively reduced.

Description

Technical Field

[0001] The invention relates to the field of copper-cobalt mixed ore beneficiation, and in particular to a method for improving the magnetic separation effect of flotation tailings of copper-cobalt mixed ore. Background Art

[0002] Copper has been an indispensable metal in human society since ancient times. Especially in the process of industrialization, copper has been widely used in light industry, electrical industry, national defense industry, construction industry, machinery manufacturing industry and other fields due to its good thermal conductivity, electrical conductivity, corrosion resistance, ductility and tensile strength. Copper ranks second in the consumption of non-ferrous metal materials in China today and is an important strategic reserve resource.

[0003] Cobalt metal is an important additive in the magnetic material industry. With a melting point of 1495°C and a boiling point of 2870°C, it has excellent properties such as ferromagnetism, high temperature resistance, and corrosion resistance. It can effectively improve the high temperature resistance and anti-aging effect of magnetic materials in the production process. It is widely used in aerospace, machinery manufacturing, ceramics, electrical and electronic industries, and other industrial fields. It is one of the important raw materials for manufacturing hard alloys, new energy batteries, and catalysts.

[0004] Sulfur-oxygen mixed copper-cobalt ore refers to an ore in which the valuable metals are copper and cobalt, and the copper and cobalt exist in both sulfide and oxidized states. The oxidation rate of an ore refers to the percentage of oxidized ore in the total ore, and the oxidation rate of sulfur-oxygen mixed copper-cobalt ore refers to the proportion of copper and cobalt oxides in the ore. Some oxidized copper and cobalt elements in mixed copper-cobalt ore are isomorphous in minerals such as limonite, copper-cobalt pyrolusite, and cobalt dolomite, and can be recovered by magnetic separation. However, both the sulfide copper-cobalt ore and the oxidized copper-cobalt ore in the sulfur-oxygen mixed copper-cobalt ore are magnetic and will affect each other. Therefore, flotation is generally required first, and the sulfide ore is generally floated out first, and then magnetic separation is performed for recovery. However, flotation changes the properties of the ore pulp, which often leads to poor magnetic separation results. Summary of the invention

[0005] The technical problem to be solved by the present invention is to overcome the above-mentioned defects of the prior art and provide a mineral processing method which can improve the magnetic separation effect of tailings obtained by flotation of sulfur-oxygen copper-cobalt mixed ore.

[0006] The technical solution adopted by the present invention to solve the technical problem is as follows: A method for improving the magnetic separation effect of tailings obtained by flotation of sulfur-oxygen copper-cobalt mixed ore, comprising the following steps:

[0007] (1) Tailings decontamination: The tailings obtained by flotation of sulfur-oxygen copper-cobalt mixed ore are concentrated and decontaminated to obtain concentrated ore pulp;

[0008] (2) Oxidative decomposition: diluting the concentrated slurry, adding an oxidant and / or injecting air for decomposition treatment, and the resulting slurry is used for magnetic separation.

[0009] Preferably, the copper grade of the oxysulfide copper-cobalt mixed ore is 2.0wt%-4.0wt%, the cobalt grade is 0.1wt%-0.4wt%, and the oxidation rate is 15wt%-85wt%.

[0010] Preferably, in step (1), the concentration of the concentrated slurry is 50wt%-55wt%.

[0011] Preferably, in step (2), the concentrated slurry is diluted to a concentration of 30wt%-35wt%.

[0012] Preferably, in step (2), the oxidant is H2O2.

[0013] Preferably, in step (2), the amount of the oxidant used is 30 to 150 g / kg.

[0014] Preferably, the oxysulfide copper-cobalt mixed ore is also subjected to pre-magnetic separation before flotation.

[0015] More preferably, the pre-magnetic separation includes a strong magnetic roughing process and a weak magnetic concentration process; the coarse concentrate obtained in the strong magnetic roughing process of the pre-magnetic separation is fed into the weak magnetic concentration process of the pre-magnetic separation; and the concentrate obtained in the weak magnetic concentration process of the pre-magnetic separation is a copper-cobalt oxide pre-magnetic separation concentrate.

[0016] More preferably, the magnetic field intensity of the strong magnetic roughing step of the pre-magnetic separation is 0.9 T or more.

[0017] More preferably, the magnetic field strength of the weak magnetic separation process of pre-magnetic separation is 0.2-0.7T.

[0018] More preferably, the ore pulp fed to the pre-magnetic separation is a slurry formed by grinding the oxysulfide copper-cobalt mixed ore to a particle size of -0.074 mm with a content of 70wt%-77wt%.

[0019] More preferably, the concentration of the slurry fed into the pre-magnetic separation is 30wt%-35wt%.

[0020] More preferably, the tailings from the pre-magnetic separation are also concentrated to a pulp concentration of 35wt%-40wt% before being fed into the oxysulfide copper-cobalt mixed ore for flotation.

[0021] More preferably, the pre-magnetic separation also includes a strong magnetic fine sweeping process; the tailings obtained from the weak magnetic concentration process of the pre-magnetic separation are fed into the strong magnetic fine sweeping process of the pre-magnetic separation; and the concentrate obtained from the strong magnetic fine sweeping process of the pre-magnetic separation is returned to the weak magnetic concentration process of the pre-magnetic separation.

[0022] More preferably, the pre-magnetic separation also includes a strong magnetic roughing separation process; the tailings obtained in the strong magnetic roughing separation process of the pre-magnetic separation are fed into the strong magnetic roughing separation process of the pre-magnetic separation; the tailings obtained in the strong magnetic fine sweeping separation process of the pre-magnetic separation are fed into the strong magnetic roughing separation process of the pre-magnetic separation; the concentrate obtained in the strong magnetic roughing separation process of the pre-magnetic separation is returned to the strong magnetic roughing separation process of the pre-magnetic separation; the tailings obtained in the strong magnetic roughing separation process of the pre-magnetic separation are the tailings of the pre-magnetic separation.

[0023] Further preferably, in the strong magnetic roughing process of the pre-magnetic separation, the magnetic field strength is 1.1-1.2T, the pulsation frequency is 8-14Hz, and the flow rate of the slurry in the magnetic field is 0.2-0.4m 3 / h.

[0024] Further preferably, the magnetic field strength of the weak magnetic separation process of the pre-magnetic separation is 0.4-0.6T, the pulsation frequency is 8-12Hz, and the flow rate of the slurry in the magnetic field is 0.2-0.4m 3 / h.

[0025] Further preferably, in the strong magnetic fine sweeping process of the pre-magnetic separation, the magnetic field strength is 1.0-1.2T, the pulsation frequency is 8-14Hz, and the flow rate of the slurry in the magnetic field is 0.2-0.4m 3 / h.

[0026] Further preferably, in the strong magnetic roughing separation process of the pre-magnetic separation, the magnetic field strength is 1.1-1.4T, the pulsation frequency is 8-14Hz, and the flow rate of the slurry in the magnetic field is 0.2-0.4m 3 / h.

[0027] Further preferably, the pre-magnetic separation uses a high gradient magnetic separator.

[0028] Preferably, the magnetic separation of tailings obtained by flotation of sulfur-oxygen copper-cobalt mixed ore includes a strong magnetic roughing separation process and a strong magnetic sweeping separation process;

[0029] The strong magnetic roughing process of the magnetic separation, the roughing tailings obtained are fed into the strong magnetic sweeping process of the magnetic separation;

[0030] The concentrate obtained by the strong magnetic roughing separation process and the strong magnetic sweeping separation process of the magnetic separation is the copper-cobalt oxide magnetic separation concentrate.

[0031] More preferably, in the strong magnetic roughing process of the magnetic separation, the magnetic field strength is 1.0-1.1T, the pulsation frequency is 8-12Hz, and the flow rate of the slurry in the magnetic field is 0.3-0.4m 3 / h.

[0032] More preferably, in the strong magnetic sweeping process of the magnetic separation, the magnetic field strength is 1.1-1.2T, the pulsation frequency is 8-12Hz, and the flow rate of the slurry in the magnetic field is 0.2-0.3m 3 / h.

[0033] More preferably, the magnetic separation uses a high gradient magnetic separator.

[0034] Preferably, the flotation of the oxysulfide copper-cobalt mixed ore includes the flotation of copper-cobalt sulfide, or includes the flotation of copper-cobalt oxide and the flotation of copper-cobalt sulfide.

[0035] More preferably, the sulfiding agent used in the copper cobalt oxide flotation is sodium hydrosulfide.

[0036] More preferably, the collector used in the copper cobalt oxide flotation is butyl xanthate.

[0037] More preferably, the frother used in the copper cobalt oxide flotation is pine oil.

[0038] More preferably, in the flotation of copper cobalt oxide, the total amount of sulfiding agent used is 5000-6000 g / t.

[0039] More preferably, in the flotation of copper cobalt oxide, the total amount of collector used is 200-550 g / t.

[0040] More preferably, in the flotation of copper cobalt oxide, the total amount of frother used is 60-100 g / t.

[0041] More preferably, the copper cobalt oxide flotation includes a roughing process and a scavenging process, or includes a roughing process, a scavenging process and a concentrating process.

[0042] More preferably, the collector used in the copper cobalt sulfide flotation is butyl xanthate.

[0043] More preferably, the frother used in the copper-cobalt sulfide flotation is pine oil.

[0044] More preferably, in the flotation of copper-cobalt sulfide, the total amount of collector used is 100-550 g / t.

[0045] More preferably, in the flotation of copper cobalt sulfide, the total amount of frother used is 20-100 g / t.

[0046] More preferably, the copper-cobalt sulfide flotation includes a roughing process and a scavenging process, or includes a roughing process, a scavenging process and a concentrating process.

[0047] Further preferably, the scavenging process of the copper cobalt oxide flotation includes more than two stages of scavenging.

[0048] Further preferably, the copper cobalt oxide flotation concentration process includes more than two stages of concentration.

[0049] Further preferably, the concentrating step of the copper cobalt oxide flotation is blank concentrating.

[0050] Further preferably, the scavenging process of the copper-cobalt sulfide flotation includes more than two stages of scavenging.

[0051] Further preferably, the copper-cobalt sulfide flotation concentration process includes more than two stages of concentration.

[0052] Further preferably, the concentrating step of the copper-cobalt sulfide flotation is blank concentrating.

[0053] The present invention has the following beneficial effects:

[0054] The present invention removes free reagents in flotation tailings by concentration before magnetic separation, and then uses oxidation decomposition to remove reagents attached to the surface of ore in the pulp, thereby eliminating the adverse effects of reagent residues in the pulp on magnetic separation, improving the copper and cobalt recovery rate of magnetic separation, and at the same time greatly reducing the COD (chemical oxygen demand) of the tailings pulp, effectively reducing the environmental pollution caused by residual flotation reagents in the tailings discharge process.

[0055] In addition to the above-described purposes, features and advantages, the present invention has other purposes, features and advantages. The present invention will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0057] Figure 1 It is a process flow diagram of a method for improving the magnetic separation effect of tailings obtained by flotation of oxysulfide copper-cobalt mixed ore according to Example 2 of the present invention. DETAILED DESCRIPTION

[0058] In order to make the purpose, scheme and beneficial technology of the present invention clearer, the present invention is further described in detail below in conjunction with the embodiments and drawings. It should be pointed out that the embodiments described in this specification are only for explaining the present invention, not for limiting the present invention.

[0059] For simplicity, only some numerical ranges are explicitly disclosed herein. However, any lower limit can be combined with any upper limit to form an unambiguous range; and any lower limit can be combined with other lower limits to form an unambiguous range, and any upper limit can be combined with any other upper limit to form an unambiguous range. In addition, although not explicitly stated, each point or single value between the range endpoints is included in the range. Thus, each point or single value can be combined with any other point or single value as its own lower limit or upper limit or with other lower limits or upper limits to form an unambiguous range.

[0060] In the description of this article, it should be noted that, unless otherwise specified, “above” and “below” are inclusive of the number, and the “multiple” in “one or more” means two or more, and the “multiple” in “one or more” means two or more.

[0061] An embodiment of the present invention provides a method for improving the magnetic separation effect of tailings obtained by flotation of oxysulfide copper-cobalt mixed ore, comprising the following steps:

[0062] (1) Tailings decontamination: The tailings obtained by flotation of sulfur-oxygen copper-cobalt mixed ore are concentrated and decontaminated to obtain concentrated ore pulp;

[0063] (2) Oxidative decomposition: diluting the concentrated slurry, adding an oxidant and / or injecting air for decomposition treatment, and the resulting slurry is used for magnetic separation.

[0064] The method for improving the magnetic separation effect of tailings obtained by flotation of sulfur-oxygen copper-cobalt mixed ore provided in the embodiment of the present invention has the following advantages:

[0065] The embodiment of the present invention removes free reagents in the flotation tailings by concentration before magnetic separation, and then uses oxidative decomposition to remove the reagents attached to the surface of the ore in the pulp, thereby eliminating the adverse effects of the residual reagents in the pulp on the magnetic separation, improving the copper and cobalt recovery rate of the subsequent magnetic separation, and at the same time greatly reducing the COD (chemical oxygen demand) of the tailings pulp, effectively reducing the environmental pollution caused by the residual flotation reagents in the tailings discharge process.

[0066] In an embodiment of the present invention, the copper grade of the oxysulfide copper-cobalt mixed ore is 2.0wt%-4.0wt%, the cobalt grade is 0.1wt%-0.4wt%, and the oxidation rate is 15wt%-85wt%.

[0067] In an embodiment of the present invention, in step (1), the concentration of the concentrated slurry is 50wt%-55wt%.

[0068] In some embodiments of the present invention, in step (1), the return water generated by the concentrated de-doping is returned to the flotation of the sulfur-oxygen copper-cobalt mixed ore for use. The return water generated by the concentrated de-doping is returned to the flotation process of the ore, which reduces the amount of flotation reagents used and effectively reduces the reagent pollution in the tailings obtained by the flotation of the sulfur-oxygen copper-cobalt mixed ore, thereby reducing the amount of sewage treatment.

[0069] In some embodiments of the present invention, in step (1), a thickener is used for concentration and drug removal. Other concentration instruments with similar functions can also be used.

[0070] In an embodiment of the present invention, in step (2), the concentrated slurry is diluted to a concentration of 30wt%-35wt%.

[0071] In an embodiment of the present invention, in step (2), the oxidant is H2O2.

[0072] In an embodiment of the present invention, in step (2), the amount of the oxidant used is 30 to 150 g / kg.

[0073] In some embodiments of the present invention, in step (2), stirring is performed after adding an oxidant and / or injecting air.

[0074] In an embodiment of the present invention, the oxysulfide copper-cobalt mixed ore is also subjected to pre-magnetic separation before flotation.

[0075] In an embodiment of the present invention, the tailings obtained from the pre-magnetic separation are used as the raw material for the flotation of the oxysulfide copper-cobalt mixed ore.

[0076] In an embodiment of the present invention, the pre-magnetic separation includes a strong magnetic roughing process and a weak magnetic concentration process; the coarse concentrate obtained in the strong magnetic roughing process of the pre-magnetic separation is fed into the weak magnetic concentration process of the pre-magnetic separation; the concentrate obtained in the weak magnetic concentration process of the pre-magnetic separation is a copper-cobalt oxide pre-magnetic separation concentrate.

[0077] In an embodiment of the present invention, the magnetic field intensity of the strong magnetic roughing process of the pre-magnetic separation is above 0.9T.

[0078] In an embodiment of the present invention, the magnetic field strength of the weak magnetic separation process of the pre-magnetic separation is 0.2-0.7T.

[0079] The pre-magnetic separation of the embodiment of the present invention utilizes the associated relationship between copper and cobalt. Since cobalt-containing minerals have weak magnetism, during magnetic separation, copper minerals associated with cobalt can be selected using cobalt minerals as magnetic carriers.

[0080] The pre-magnetic separation process combining strong and weak magnetic fields in the embodiment of the present invention can recover copper-cobalt oxide ore from the mixed copper-cobalt ore containing sulphur and oxygen. Both the copper-cobalt sulfide ore and the copper-cobalt oxide ore in the mixed copper-cobalt ore containing sulphur and oxygen are magnetic. The prior art uses a magnetic separation process, which generally separates magnetic and non-magnetic minerals, and cannot separate copper-cobalt oxide ore from copper-cobalt sulfide ore.

[0081] Most of the oxidized copper-cobalt ore can be recovered in advance through pre-magnetic separation. Using the tailings of pre-magnetic separation as raw materials for flotation can reduce the amount of ore entering flotation by about 2%-10%, and accordingly, the configuration of flotation equipment can be reduced by 2-10%; pre-magnetic separation also reduces the amount of copper-cobalt metal entering flotation by about 5%-45%, which can reduce the consumption of flotation reagents and has good economic benefits. Compared with oxidized copper-cobalt ore, sulfide copper-cobalt ore is less difficult to beneficiate by common beneficiation methods such as flotation, and the effect is better. Therefore, the oxidized copper-cobalt ore is selected from the sulfide-oxygen mixed copper-cobalt ore by magnetic separation in advance, which reduces the overall beneficiation difficulty and has a positive effect on the subsequent beneficiation effect.

[0082] Pre-magnetic separation mainly selects coarser oxide ore particles, while finer oxide ore particles are selected by magnetic separation after flotation of sulfur-oxygen-copper-cobalt mixed ore. By setting the two magnetic separations differently and coordinating them with each other, a simpler process can achieve better ore dressing results.

[0083] The amount of copper-cobalt oxide in the tailings obtained by pre-magnetic separation is significantly reduced compared to the original ore, which also reduces the interference of copper-cobalt oxide, and has a positive effect on improving the grade of sulfide ore flotation concentrate products. In some embodiments of the present invention, a flotation effect with a copper grade greater than 60% can be obtained; further, the improvement of the flotation effect of sulfide ore reduces the screening pressure of subsequent magnetic separation and improves the magnetic separation effect.

[0084] In some embodiments of the present invention, the pre-magnetic separation uses a high gradient magnetic separator, which is a magnetic separator commonly used in industrial production, and other magnetic separators with similar functions can be used.

[0085] In some embodiments of the present invention, the pre-magnetic separation uses a vertical ring high gradient magnetic separator. Other magnetic separators with similar functions can be used.

[0086] In some embodiments of the present invention, the ore pulp fed to the pre-magnetic separation is: a slurry formed by grinding the oxysulfide copper-cobalt mixed ore to a particle size of -0.074 mm with a content of 70wt%-77wt%.

[0087] In some embodiments of the present invention, the grinding process of the copper-cobalt sulfide mixed ore does not require any reagents.

[0088] In some embodiments of the present invention, the grinding water used in the grinding process of the oxysulfide copper-cobalt mixed ore is clean water.

[0089] In some embodiments of the present invention, clean water and / or return water obtained by concentrating the pre-magnetic separation tailings are added to participate in the grinding of the sulfur-oxygen copper-cobalt mixed ore.

[0090] In some embodiments of the present invention, the concentration of the slurry fed to the pre-magnetic separation is 30wt%-35wt%.

[0091] In some embodiments of the present invention, the tailings of the pre-magnetic separation are also concentrated to a pulp concentration of 35wt%-40wt% before being fed into the sulfur-oxygen copper-cobalt mixed ore for flotation. Concentrating the tailings of the pre-magnetic separation to a higher concentration before feeding the sulfur-oxygen copper-cobalt mixed ore for flotation is conducive to further improving the recovery rate of copper and cobalt in the flotation stage; at the same time, a part of water can be recovered. Since flotation often requires the use of organic reagents, this technical solution also reduces the burden of water treatment after flotation.

[0092] In some embodiments of the present invention, the tailings of the pre-magnetic separation are fed into the sulfur-oxygen copper-cobalt mixed ore before flotation and the return water generated by the concentration is used to adjust the concentration of the ore pulp fed into the pre-magnetic separation;

[0093] In some embodiments of the present invention, the pre-magnetic separation also includes a strong magnetic fine sweeping process; the tailings obtained from the weak magnetic concentration process of the pre-magnetic separation are fed into the strong magnetic fine sweeping process of the pre-magnetic separation; the concentrate obtained from the strong magnetic fine sweeping process of the pre-magnetic separation is returned to the weak magnetic concentration process of the pre-magnetic separation.

[0094] In some embodiments of the present invention, the pre-magnetic separation also includes a strong magnetic roughing separation process; the tailings obtained in the strong magnetic roughing separation process of the pre-magnetic separation are fed into the strong magnetic roughing separation process of the pre-magnetic separation; the tailings obtained in the strong magnetic fine sweeping separation process of the pre-magnetic separation are fed into the strong magnetic roughing separation process of the pre-magnetic separation; the concentrate obtained in the strong magnetic roughing separation process of the pre-magnetic separation is returned to the strong magnetic roughing separation process of the pre-magnetic separation; the tailings obtained in the strong magnetic roughing separation process of the pre-magnetic separation are the tailings of the pre-magnetic separation.

[0095] The magnetic separation process that combines strong magnetic roughing separation, weak magnetic concentrating separation, strong magnetic fine sweeping separation and strong magnetic roughing sweeping separation can achieve better mineral processing effects.

[0096] In some embodiments of the present invention, the strong magnetic roughing process of the pre-magnetic separation is as follows: the magnetic field strength is 1.1-1.2T, the pulsation frequency is 8-14Hz, and the flow rate of the slurry in the magnetic field is 0.2-0.4m 3 / h.

[0097] In some embodiments of the present invention, the magnetic field strength of the weak magnetic separation process of the pre-magnetic separation is 0.4-0.6T, the pulsation frequency is 8-12Hz, and the flow rate of the slurry in the magnetic field is 0.2-0.4m 3 / h.

[0098] In some embodiments of the present invention, the strong magnetic fine sweeping process of the pre-magnetic separation has a magnetic field strength of 1.0-1.2T, a pulsation frequency of 8-14Hz, and a flow rate of the slurry in the magnetic field of 0.2-0.4m 3 / h.

[0099] In some embodiments of the present invention, the strong magnetic roughing separation process of the pre-magnetic separation has a magnetic field strength of 1.1-1.4T, a pulsation frequency of 8-14Hz, and a flow rate of the slurry in the magnetic field of 0.2-0.4m 3 / h.

[0100] In an embodiment of the present invention, the magnetic separation of tailings obtained by flotation of sulfur-oxygen copper-cobalt mixed ore includes a strong magnetic roughing separation process and a strong magnetic sweeping separation process;

[0101] The strong magnetic roughing process of the magnetic separation, the roughing tailings obtained are fed into the strong magnetic sweeping process of the magnetic separation;

[0102] The concentrate obtained by the strong magnetic roughing separation process and the strong magnetic sweeping separation process of the magnetic separation is the copper-cobalt oxide magnetic separation concentrate.

[0103] The remaining copper-cobalt oxide minerals in the flotation tailings are mainly fine-grained minerals, and strong magnetic separation has a good magnetic separation effect.

[0104] In some embodiments of the present invention, the magnetic field strength of the strong magnetic roughing process of the magnetic separation is 1.0-1.1T, the pulsation frequency is 8-12Hz, and the flow rate of the slurry in the magnetic field is 0.3-0.4m 3 / h.

[0105] In some embodiments of the present invention, the magnetic separation process of the strong magnetic separation has a magnetic field strength of 1.1-1.2T, a pulsation frequency of 8-12Hz, and a flow rate of the slurry in the magnetic field of 0.2-0.3m 3 / h.

[0106] In magnetic separation, since flotation has separated the sulfide ores, the existence form of the valuable metals in the slurry changes from a mixture of sulfide ores and oxide ores to oxide ores being the majority, and there is no need to separate sulfide ores from oxide ores. Therefore, compared with pre-magnetic separation, a simpler magnetic separation method can be used to successfully recover the remaining copper and cobalt oxide minerals.

[0107] In some embodiments of the present invention, the magnetic separation uses a high gradient magnetic separator, which is a magnetic separator commonly used in industrial production, and other magnetic separators with similar functions can be used.

[0108] In some embodiments of the present invention, the magnetic separation uses a vertical ring high gradient magnetic separator. Other magnetic separators with similar functions can be used.

[0109] In some embodiments of the present invention, the tailings obtained in the strong magnetic sweeping process of the magnetic separation are magnetic separation tailings.

[0110] In an embodiment of the present invention, the flotation of the oxysulfide copper-cobalt mixed ore includes the flotation of copper-cobalt sulfide, or includes the flotation of copper-cobalt oxide and the flotation of copper-cobalt sulfide.

[0111] In some embodiments of the present invention, the flotation of the oxysulfide copper-cobalt mixed ore is sulfide copper-cobalt flotation.

[0112] In some embodiments of the present invention, the flotation of the oxysulfide copper-cobalt mixed ore is to first perform copper-cobalt oxide flotation, and then perform copper-cobalt sulfide flotation on the tailings obtained from the copper-cobalt oxide flotation.

[0113] In some embodiments of the present invention, the flotation of the copper-cobalt mixed ore with oxysulfide is to first perform copper-cobalt sulfide flotation, and then perform copper-cobalt oxide flotation on the tailings obtained from the copper-cobalt sulfide flotation.

[0114] In some embodiments of the present invention, the flotation of the oxysulfide copper-cobalt mixed ore is performed by alternating copper-cobalt oxide flotation and copper-cobalt sulfide flotation for multiple times.

[0115] In some embodiments of the present invention, the sulfiding agent used in the copper cobalt oxide flotation is sodium hydrosulfide.

[0116] In some embodiments of the present invention, the collector used in the copper cobalt oxide flotation is butyl xanthate.

[0117] In some embodiments of the present invention, the frother used in the copper cobalt oxide flotation is pine oil.

[0118] In some embodiments of the present invention, in the copper cobalt oxide flotation, the total amount of sulfiding agent used is 5000-6000 g / t.

[0119] In some embodiments of the present invention, in the copper cobalt oxide flotation, the total amount of collector used is 200-550 g / t.

[0120] In some embodiments of the present invention, in the copper cobalt oxide flotation, the total amount of frother used is 60-100 g / t.

[0121] In some embodiments of the present invention, the copper-cobalt oxide flotation includes a roughing process and a scavenging process.

[0122] In some embodiments of the present invention, the roughing tailings obtained from the roughing process of the copper-cobalt oxide flotation are fed into the scavenging process of the copper-cobalt oxide flotation.

[0123] In some embodiments of the present invention, the concentrate obtained by the roughing process and the scavenging process of the copper-cobalt oxide flotation is a copper-cobalt oxide flotation concentrate.

[0124] In some embodiments of the present invention, the copper cobalt oxide flotation includes a roughing process, a scavenging process and a cleaning process.

[0125] In some embodiments of the present invention, the coarse concentrate obtained from the roughing process of copper-cobalt oxide flotation is fed into the concentrating process of copper-cobalt oxide flotation.

[0126] In some embodiments of the present invention, the tailings obtained from the roughing process of copper-cobalt oxide flotation are fed into the scavenging process of copper-cobalt oxide flotation.

[0127] In some embodiments of the present invention, the concentrated ore concentrate obtained by the copper-cobalt oxide flotation concentration step is a copper-cobalt oxide flotation concentrate.

[0128] In some embodiments of the present invention, the concentrated tailings obtained from the concentrating step of copper-cobalt oxide flotation are returned to the roughing step of copper-cobalt oxide flotation.

[0129] In some embodiments of the present invention, the scavenged concentrate obtained in the scavenging process of the copper-cobalt oxide flotation is returned to the roughing process of the copper-cobalt oxide flotation.

[0130] In some embodiments of the present invention, the scavenging tailings obtained in the scavenging process of the copper-cobalt oxide flotation are copper-cobalt oxide flotation tailings.

[0131] In some embodiments of the present invention, the collector used in the copper cobalt sulfide flotation is butyl xanthate.

[0132] In some embodiments of the present invention, the frother used in the copper-cobalt sulfide flotation is pine oil.

[0133] In some embodiments of the present invention, in the flotation of copper-cobalt sulfide, the total amount of collector used is 100-550 g / t.

[0134] In some embodiments of the present invention, in the copper-cobalt sulfide flotation, the total amount of frother used is 20-100 g / t.

[0135] In some embodiments of the present invention, the copper-cobalt sulfide flotation includes a roughing process and a scavenging process.

[0136] In some embodiments of the present invention, the rougher tailings obtained from the rougher separation process of the copper-cobalt sulfide flotation are fed into the scavenger separation process of the copper-cobalt sulfide flotation.

[0137] In some embodiments of the present invention, the concentrate obtained by the roughing process and the scavenging process of the copper-cobalt sulfide flotation is a copper-cobalt sulfide flotation concentrate.

[0138] In some embodiments of the present invention, the copper-cobalt sulfide flotation includes a roughing process, a scavenging process and a cleaning process.

[0139] In some embodiments of the present invention, the coarse concentrate obtained from the roughing process of the copper-cobalt sulfide flotation is fed into the concentrating process of the copper-cobalt sulfide flotation.

[0140] In some embodiments of the present invention, the tailings obtained from the roughing process of the copper-cobalt sulfide flotation are fed into the scavenging process of the copper-cobalt sulfide flotation.

[0141] In some embodiments of the present invention, the concentrated ore concentrate obtained by the copper-cobalt sulfide flotation concentration step is a copper-cobalt sulfide flotation concentrate.

[0142] In some embodiments of the present invention, the concentrated tailings obtained from the concentrating step of the copper-cobalt sulfide flotation are returned to the roughing step of the copper-cobalt sulfide flotation.

[0143] In some embodiments of the present invention, the scavenged concentrate obtained in the scavenging process of the copper-cobalt sulfide flotation is returned to the roughing process of the copper-cobalt sulfide flotation.

[0144] In some embodiments of the present invention, the scavenging tailings obtained in the scavenging process of the copper-cobalt sulfide flotation are copper-cobalt sulfide flotation tailings.

[0145] In some embodiments of the present invention, the scavenging process of copper-cobalt oxide flotation includes more than two stages of scavenging.

[0146] In some embodiments of the present invention, the scavenging process of copper-cobalt oxide flotation includes more than two scavenging stages; the concentrate obtained in each scavenging stage is copper-cobalt oxide flotation concentrate; except for the last scavenging stage, the scavenging tailings obtained in other scavenging stages enter the next scavenging stage.

[0147] In some embodiments of the present invention, the scavenging process of the copper-cobalt oxide flotation includes two or more scavenging stages:

[0148] The scavenged concentrate obtained in the first stage of scavenging is returned to the roughing process of the copper-cobalt oxide flotation, and the concentrate obtained in other stages of scavenging is returned to the previous stage of scavenging;

[0149] The scavenging tailings obtained in the last scavenging stage are copper-cobalt oxide flotation tailings, and the tailings obtained in other scavenging stages enter the next scavenging stage.

[0150] In some embodiments of the present invention, the copper cobalt oxide flotation separation process includes more than two stages of separation.

[0151] In some embodiments of the present invention, the flotation process of copper-cobalt oxide includes two or more stages of flotation:

[0152] The tailings obtained from the first stage of concentration are returned to the roughing process of the copper-cobalt oxide flotation, and the tailings obtained from the other stages of concentration are returned to the previous stage of concentration;

[0153] The concentrated ore obtained in the last stage of selection is copper-cobalt oxide flotation concentrate, and the concentrates obtained in other stages of selection enter the next stage of selection.

[0154] In some embodiments of the present invention, the concentrating process of copper cobalt oxide flotation is blank concentrating.

[0155] In some embodiments of the present invention, the scavenging process of copper-cobalt sulfide flotation includes more than two stages of scavenging.

[0156] In some embodiments of the present invention, the scavenging process of the copper-cobalt sulfide flotation includes more than two stages of scavenging; the concentrate obtained in each stage of scavenging is the copper-cobalt sulfide flotation concentrate; except for the last stage of scavenging, the scavenging tailings obtained in other stages of scavenging enter the next stage of scavenging.

[0157] In some embodiments of the present invention, the scavenging process of the copper-cobalt sulfide flotation includes more than two stages of scavenging:

[0158] The scavenged concentrate obtained in the first stage of scavenging is returned to the roughing process of the copper-cobalt sulfide flotation, and the concentrate obtained in other stages of scavenging is returned to the previous stage of scavenging;

[0159] The scavenging tailings obtained in the last scavenging stage are copper-cobalt sulfide flotation tailings, and the tailings obtained in other scavenging stages enter the next scavenging stage.

[0160] In some embodiments of the present invention, the copper-cobalt sulfide flotation concentration process includes more than two stages of concentration.

[0161] In some embodiments of the present invention, the flotation process of copper-cobalt sulfide includes two or more stages of concentrating:

[0162] The tailings obtained from the first stage of concentration are returned to the roughing process of the copper-cobalt sulfide flotation, and the tailings obtained from the other stages of concentration are returned to the previous stage of concentration;

[0163] The concentrated ore obtained in the last stage of selection is copper-cobalt sulfide flotation concentrate, and the concentrates obtained in other stages of selection enter the next stage of selection.

[0164] In some embodiments of the present invention, the concentrating process of copper-cobalt sulfide flotation is blank concentrating.

[0165] In some embodiments of the present invention, the roughing process of the copper-cobalt oxide flotation includes one stage of roughing; and the scavenging process of the copper-cobalt oxide flotation includes four stages of scavenging.

[0166] In some embodiments of the present invention, the roughing process of the copper-cobalt oxide flotation includes one stage of roughing; the scavenging process of the copper-cobalt oxide flotation includes five stages of scavenging; and the concentrating process of the copper-cobalt oxide flotation includes three stages of concentrating.

[0167] In some embodiments of the present invention, the roughing process of the copper-cobalt oxide flotation includes one stage of roughing, the scavenging process of the copper-cobalt oxide flotation includes three stages of scavenging, and the concentrating process of the copper-cobalt oxide flotation includes four stages of concentrating.

[0168] In some embodiments of the present invention, the roughing process of the copper-cobalt sulfide flotation includes one stage of roughing; and the scavenging process of the copper-cobalt sulfide flotation includes four stages of scavenging.

[0169] In some embodiments of the present invention, the roughing process of the copper-cobalt sulfide flotation includes one stage of roughing; the scavenging process of the copper-cobalt sulfide flotation includes five stages of scavenging; and the concentrating process of the copper-cobalt sulfide flotation includes three stages of concentrating.

[0170] In some embodiments of the present invention, the roughing process of the copper-cobalt sulfide flotation includes one stage of roughing, the scavenging process of the copper-cobalt sulfide flotation includes three stages of scavenging, and the concentrating process of the copper-cobalt sulfide flotation includes four stages of concentrating.

[0171] The scientific name of yellow medicine is xanthate, which is also called alkyl dithiocarbonate according to its chemical composition. The general chemical composition is: ROCSSMe. Me is Na + or K+ . It is mainly used as a froth flotation collector, a hydrometallurgical precipitant, a rubber vulcanization accelerator, etc. Among them, it is used as a flotation collector in the largest amount. It is an effective collector widely used in the flotation of pyrite and non-ferrous metal ores. Xanthate can form water-insoluble chelates with certain heavy metal ions. Xanthate is generally toxic to aquatic organisms, easily causes heavy metal enrichment, and is teratogenic. It affects the ecological environment around the mining area, causing the biochemical oxygen demand, chemical oxygen demand, and pH value of the wastewater of the concentrator to exceed the standard. If it is discharged without treatment, it will cause the surrounding water to have a foul odor and deteriorate, so it must be treated.

[0172] Frothing agent is an indispensable agent in the flotation beneficiation process. In order to effectively enrich useful minerals at the interface between air and water, it is necessary to use a foaming agent to create a large number of interfaces and produce a large amount of foam. Pine oil (2# oil) is the most widely used foaming agent. Its main component is a-terpene alcohol, with a content of about 50%. Pine oil is a light yellow oily liquid, lighter in color than pine oil, with a specific gravity between 0.9-0.91, flammable, slightly soluble in water, and oxidizable in the air. After oxidation, the viscosity increases. Pine oil has strong foaming properties and can generate bubbles of uniform size, medium viscosity and suitable stability.

[0173] Sodium hydrosulfide is used as a sulfiding agent for non-ferrous metal oxide ores. Non-ferrous metal oxide ores cannot be directly captured by xanthate. However, if sodium hydrosulfide is added to react with non-ferrous metal oxide ores before xanthate flotation, a thin film of sulfide ore can be produced on the surface of the mineral, and xanthate can capture it. This effect of sodium hydrosulfide is called sulfidation, so it can be used as a sulfiding agent for non-ferrous metal oxide ores. 2- , HS - It has strong reducing properties and easily undergoes redox reactions with oxygen in the air after dissolving in water.

[0174] The test shows that the mineral processing reagents remaining in the slurry or attached to the surface of the ore will affect the magnetic separation effect, resulting in poor recovery effect of re-magnetic separation, and the reagents remaining in the slurry will also cause certain environmental pollution problems when discharged with the tailings. Mineral processing operations are generally carried out under alkaline conditions. The mineral processing wastewater undergoes flocculation, precipitation and clarification in the tailings dam, and its heavy metal ions meet the emission standards. Therefore, the harmful components of pollutants in mineral processing wastewater are mainly soluble mineral processing reagents. Some mineral processing reagents are mostly precipitated or decomposed by the long-term residence of wastewater in the tailings dam, solar radiation, biochemical reactions and atmospheric oxidation factors, while others are difficult to degrade, causing environmental pollution.

[0175] In the embodiments of the present invention, the reason why the sulfide ore flotation tailings entering the magnetic separation are first de-doped and then subjected to deep oxidation treatment can be explained by the following mechanism:

[0176] In the flotation process, butyl xanthate is a polar collector, which is molecularly or chemically adsorbed on the surface of sulfide minerals to improve the floatability of the minerals. Pinene alcohol is a heteropolar surfactant, with a polar group being hydrophilic and a non-polar group being aerophilic. It is adsorbed on the liquid-gas interface in the flotation pulp and arranged in a directional manner, thereby reducing the surface tension of water in the pulp and increasing the diffusion of air in the pulp. Due to the hydrophobicity of the mineral surface, mineralized foam is formed. When flotation is used to recover oxide ore, a sulfiding agent is first used to sulfide the mineral surface, so that the oxide mineral exhibits the properties of sulfide minerals.

[0177] Hydrogen peroxide is a strong oxidant. In the slurry environment, H2O2 can be decomposed into oxygen and hydroxyl radicals (·OH). The redox reaction potential of hydroxyl radicals is 2.80V. Therefore, H2O2 has a significant degradation effect on organic agents attached to the surface of the ore. H2O2 reacts in the solution as shown in formulas (1) and (2):

[0178] 2H2O2 →2H2O + O2↑ (1)

[0179] H2O2 + hv →2·OH (2)

[0180] In the flotation process of sulfide ore, the frother mainly forms mineralized foam with the valuable ore, floats out together with the sulfide ore concentrate, and a small amount remains in the tailings slurry. After testing, it was found that under the action of a strong oxidant, the removal rate of No. 2 oil can be more than 80% when the oxidation time is more than 8 minutes.

[0181] Xanthate ions react with air in aqueous solution, as shown in formula (3):

[0182] Xanthate ions are oxidized to monothiocarbonate, as shown in formula (4):

[0183] 2ROCSS - + O2==2ROCOS - +2S (4)

[0184] Xanthate ions are oxidized to dixanthate, as shown in formula (5):

[0185] 4ROCSS - + 2H2O+O2==2(ROCSS)2+4OH - (5)

[0186] In formula (3), formula (4), and formula (5), R represents C4H9. Double yellow medicine is unstable and eventually turns into CO3 2- 、HCO3 - , HS - and trithiocarbonate.

[0187] Sulfiding agents are easily oxidized in solution:

[0188] 2Na2S+2O2+H2O→Na2S2O3+2NaOH (6)

[0189] 2NaHS+H2O→2NaOH+2H2S↑ (7)

[0190] Na2S + O2→ Na2SO4 (8)

[0191] The de-doping process can separate the free reagents remaining in the slurry water system to prevent the reagents from repeatedly acting on the mineral surface. At the same time, the residual reagents on the surface of the copper-cobalt oxidized ore can be decomposed by adding strong oxidants and injecting air.

[0192] Due to the hydration repulsion between hydrophilic colloids, the hydrophobic force between hydrophobic colloids, and the spatial repulsion between macromolecular compounds, according to the extended DLVO theory, the total interaction energy between colloid particles is given by formula (9):

[0193]

[0194] Where: W V is the van der Waals interaction energy; E V is the electrostatic interaction energy; V HR is the hydration interaction repulsion energy; V HA V is the hydrophobic interaction attraction energy; SR is the steric stabilization energy; V MA is the magnetic attraction potential energy, V FA is the fluid dynamics interaction potential energy.

[0195]

[0196] The constant A in formula (10) is the Hamaker constant; the Hamaker constants of particles 1 and 2 in the liquid medium can be obtained according to formula (11):

[0197]

[0198] Where: A 11 and A 22 are the Hamaker constants of mineral particles 1 and 2 in vacuum; A 33 is the Hamaker constant of water medium in vacuum.

[0199]

[0200] Where ψ is the surface potential of the mineral, which can be expressed by the zeta potential ζ, in volts, and ε a represents the absolute dielectric constant of water, which is 6.95×10 -10 C2 / (J·m); H is in nm, indicating the distance between two particles; k -1 Debye length represents the thickness of the double electrical layer in nm.

[0201] For the electrolyte ratio of 1:1 and the absolute temperature of 298K, k -1 The expression of is shown in formula (13):

[0202]

[0203] Where C represents the molar concentration of the ion volume, and the unit is mol / L.

[0204]

[0205] Where: is the hydrophilic interaction energy constant, which is related to the surface wettability and the h0 position attenuation length.

[0206]

[0207] Where: is the hydrophobic interaction energy constant (mJ / m 2 )

[0208] For hydrophilic systems:

[0209]

[0210] For hydrophobic systems:

[0211]

[0212] During the flotation process, the addition of collectors and frothers changes the physical and chemical properties of the mineral particles, causing changes in the van der Waals force, electrostatic force, hydration interaction repulsion and hydrophobic interaction attraction between the copper-cobalt oxide ore particles. The total interaction force between the mineral particles is affected by the reagents and superimposed, resulting in poor magnetic separation of flotation tailings.

[0213] Magnetic separation is a separation technology that separates materials based on their magnetic properties. After the particles in the material enter the non-uniform magnetic field, they are affected by magnetic force and competitive force. Particles with strong magnetic properties are affected by greater magnetic force, while particles with weak magnetic properties are affected by less magnetic force. In order to separate the two, the following conditions need to be met:

[0214]

[0215] Where: F m —Magnetic force on strongly magnetic particles, N; —Magnetic force on weakly magnetic particles, N; Fc —The sum of all competitive forces opposing the magnetic force, N.

[0216] After the minerals in the flotation process of the present invention, a part of the reagent remains in the tailings, so that the surface of the mineral particles in the tailings still has good hydrophobicity and is not easy to agglomerate. After this part of the minerals enters the magnetic separator, because the mineral particles are relatively fine, the magnetic field force and magnetic field gradient of the external magnetic field are insufficient to overcome the total interaction force and fluid drag between the fine-grained minerals, and therefore it is not easy to be adhered to the surface of the magnetic medium in the magnetic separation stage, thereby causing this part of the magnetic copper-cobalt oxide ore to flow into the tailings with the fluid.

[0217] The interaction between the reagent and the fine-particle minerals is weakened, thereby eliminating the influence of the reagent on the magnetic properties of the copper-cobalt oxide mineral particles, so that they can be effectively captured by the magnetic medium in the high-gradient magnetic field, thereby improving the recovery effect of magnetic separation on this part of the copper-cobalt oxide ore.

[0218] Example

[0219] The following examples describe the disclosure of the present invention in more detail, and these examples are intended for illustrative purposes only, as it will be apparent to those skilled in the art that various modifications and variations will be made within the scope of the disclosure of the present invention. Unless otherwise stated, all parts, percentages, and ratios reported in the following examples are by weight. Unless otherwise stated, all reagents used in the examples are available through conventional commercial sources or are synthesized according to conventional methods and can be used directly without further processing. Unless otherwise stated, the instruments used in the examples are available through conventional commercial sources.

[0220] Example 1

[0221] A sulfur-oxygen mixed copper-cobalt ore in the Democratic Republic of the Congo is a typical difficult-to-process copper-cobalt mixed ore. Through process mineralogical analysis, valuable minerals mainly exist in the form of chalcocite, malachite and hydrocobaltite, and copper and cobalt minerals coexist closely. Through detection and analysis, the original ore contains about 2.7% copper, about 0.36% cobalt, and the copper oxidation rate is 82.3%.

[0222] This embodiment provides a method for improving the magnetic separation effect of tailings obtained by flotation of sulfur-oxygen copper-cobalt mixed ore, which is carried out according to the following steps:

[0223] (1) Grinding

[0224] The copper-cobalt mixed ore is ground, the grinding water is clean water, and no reagents are added during the grinding process; the grinding fineness is -0.074mm, the particle size content is 72.13%; the slurry concentration is 30.96%.

[0225] (2) Pre-magnetic separation:

[0226] The pulp obtained by grinding is subjected to one strong magnetic roughing separation, one weak magnetic cleaning separation, one strong magnetic fine sweeping separation and one strong magnetic rough sweeping separation by using a vertical ring high gradient magnetic separator;

[0227] The detailed process of pre-magnetic separation is as follows:

[0228] The magnetic field strength of the strong magnetic roughing is 1.2T, the pulsation frequency is 12Hz, and the flow rate of the slurry in the magnetic field is 0.4m 3 / h, the concentrate obtained is fed into the weak magnetic concentration process, and the tailings obtained is fed into the strong magnetic rough sweeping process;

[0229] The magnetic field strength of weak magnetic concentration is 0.6T, the pulsation frequency is 8Hz, and the flow rate of the slurry in the magnetic field is 0.2m 3 / h, the obtained concentrate is the copper-cobalt oxide pre-magnetic separation concentrate, and the obtained tailings are fed into the strong magnetic separation process;

[0230] The magnetic field strength of the strong magnetic fine sweeping is 1.2T, the pulsation frequency is 12Hz, and the flow rate of the slurry in the magnetic field is 0.3m 3 / h, the concentrate is returned to the weak magnetic concentration process, and the tailings are fed to the strong magnetic rough sweeping process;

[0231] The magnetic field strength of the strong magnetic roughing separation is 1.3T, the pulsation frequency is 12Hz, and the flow rate of the slurry in the magnetic field is 0.3m 3 / h, the concentrate is returned to the strong magnetic roughing process, and the tailings obtained are the pre-magnetic separation tailings.

[0232] (3) Copper-cobalt sulfide flotation

[0233] The pre-magnetic separation tailings concentrated to a pulp concentration of 35.01% are subjected to copper-cobalt sulfide flotation;

[0234] The copper-cobalt sulfide flotation of this embodiment includes a roughing process, a scavenging process and a concentrating process: the rough concentrate obtained in the roughing process is fed into the concentrating process; the tailings obtained in the roughing process are fed into the scavenging process; the concentrating concentrate obtained in the concentrating process is the copper-cobalt sulfide flotation concentrate; the concentrating tailings obtained in the concentrating process are returned to the roughing process; the scavenged concentrate obtained in the scavenging process is returned to the roughing process; the scavenged tailings obtained in the scavenging process are the copper-cobalt sulfide flotation tailings.

[0235] This embodiment adopts a one roughing, three scavenging and four concentrating method: the scavenged concentrate obtained in the first scavenging stage is returned to the roughing process, and the concentrate obtained in other stages is returned to the previous scavenging stage; the scavenged tailings obtained in the last stage of scavenging are copper-cobalt sulfide flotation tailings, and the tailings obtained in other stages of scavenging enter the next scavenging stage; the concentrated tailings obtained in the first concentrating stage are returned to the roughing process, and the tailings obtained in other stages of concentrating are returned to the previous concentrating stage; the concentrated concentrate obtained in the last stage of concentrating is copper-cobalt sulfide flotation concentrate, and the concentrates obtained in other stages of concentrating enter the next stage of concentrating.

[0236] In this embodiment, the flotation of copper cobalt sulfide is blank selection. In the roughing and scavenging, a total of 135 g / t of collector (butyl xanthate) and a total of 35 g / t of frother (pine oil) are used.

[0237] (4) Copper-cobalt oxide flotation

[0238] Flotation of copper-cobalt oxide from copper-cobalt sulfide flotation tailings;

[0239] The flotation of copper-cobalt oxide in this embodiment includes a roughing process, a scavenging process and a concentrating process. The rough concentrate obtained in the roughing process is fed into the concentrating process; the tailings obtained in the roughing process are fed into the scavenging process; the concentrating concentrate obtained in the concentrating process is the copper-cobalt oxide flotation concentrate; the concentrating tailings obtained in the concentrating process are returned to the roughing process; the scavenged concentrate obtained in the scavenging process is returned to the roughing process; the scavenged tailings obtained in the scavenging process are the copper-cobalt oxide flotation tailings;

[0240] This embodiment adopts a one roughing, five scavenging and three concentrating method: the scavenged concentrate obtained from the first scavenging process is returned to the roughing process, and the concentrates obtained from the other scavenging processes are returned to the previous scavenging process; the scavenged tailings obtained from the last scavenging process are copper-cobalt oxide flotation tailings, and the tailings obtained from the other scavenging processes enter the next scavenging process; the concentrated tailings obtained from the first concentrating process are returned to the roughing process, and the tailings obtained from the other concentrating processes are returned to the previous concentrating process; the concentrated concentrate obtained from the last concentrating process is copper-cobalt oxide flotation concentrate, and the concentrates obtained from the other concentrating processes enter the next concentrating process.

[0241] In this embodiment, the flotation of copper cobalt oxide is blank selection. In the roughing and scavenging, a total of 6000 g / t of sulfiding agent (sodium hydrosulfide) (600 g / t of which comes from backwater), a total of 400 g / t of collector (butyl xanthate) (15 g / t of which comes from backwater), and a total of 55 g / t of frother (pine oil) (5 g / t of which comes from backwater) are used.

[0242] (4) Tailings decontamination

[0243] The copper-cobalt oxide flotation tailings obtained in step (4) are mechanically stirred and concentrated to 55 wt% to achieve drug removal; the concentrated overflow water is returned to the copper-cobalt oxide flotation for use.

[0244] (5) Oxidative decomposition

[0245] Add clean water to the concentrated slurry and adjust the slurry to a slurry concentration of 32.14%. Add a clean oxidant and fill with air and stir for 10 minutes to achieve strong oxidative decomposition treatment of the residual reagents in the slurry; the clean oxidant is H2O2, and the addition amount is: 60ml / kg (50% dosage form, approximately 85g / kg).

[0246] (7) Magnetic separation

[0247] The slurry after slurry adjustment and oxidation is subjected to a strong magnetic roughing separation and a strong magnetic sweeping separation using a vertical ring high gradient magnetic separator;

[0248] The magnetic field strength of the strong magnetic roughing is 1.1T, the pulsation frequency is 10Hz, and the flow rate of the slurry in the magnetic field is 0.4m 3 / h, the tailings are fed into the strong magnetic sweeping process; the magnetic field strength of the strong magnetic sweeping is 1.2T, the pulsation frequency is 12Hz, and the flow rate of the slurry in the magnetic field is 0.3m 3 / h; the concentrates obtained from the strong magnetic roughing separation and the strong magnetic scavenging separation are combined into the copper-cobalt oxide magnetic separation concentrate, and the tailings from the strong magnetic scavenging separation are the final tailings.

[0249] The sulfur-oxygen copper-cobalt mixed ore was treated by the combined magnetic-flotation-magnetic method of first magnetic, then floatation and then magnetic again. Typical test results are shown in Table 1.

[0250] Table 1 Magnetic flotation separation test index of a sulfur-oxygen copper-cobalt ore in Congo (DRC)

[0251]

[0252] Example 2

[0253] A sulfur-oxygen mixed copper-cobalt ore in the Democratic Republic of the Congo is a typical difficult-to-process copper-cobalt mixed ore. Through process mineralogical analysis, valuable minerals mainly exist in the form of chalcocite, malachite and hydrocobaltite, and copper and cobalt minerals coexist closely. Through detection and analysis, the original ore contains about 3.6% copper, about 0.22% cobalt, and the copper oxidation rate is 18.19%.

[0254] The process flow chart of this embodiment is as follows Figure 1 This embodiment provides a method for improving the magnetic separation effect of tailings obtained by flotation of sulfur-oxygen copper-cobalt mixed ore, which is carried out in the following steps:

[0255] (1) Grinding

[0256] The copper-cobalt mixed ore is ground, and the grinding water is clean water plus concentrated return water of pre-magnetic separation tailings. No reagents are added during the grinding process; the grinding fineness is -0.074mm and the particle size content is 75.73%; the slurry concentration is 31.16%.

[0257] (2) Pre-magnetic separation

[0258] The pulp obtained by grinding is subjected to one strong magnetic roughing separation, one weak magnetic cleaning separation, one strong magnetic fine sweeping separation and one strong magnetic rough sweeping separation by using a vertical ring high gradient magnetic separator;

[0259] The detailed process of pre-magnetic separation is as follows:

[0260] The magnetic field strength of the strong magnetic roughing is 1.2T, the pulsation frequency is 10Hz, and the flow rate of the slurry in the magnetic field is 0.4m 3 / h, the concentrate obtained is fed into the weak magnetic concentration process, and the tailings obtained is fed into the strong magnetic rough sweeping process;

[0261] The magnetic field strength of weak magnetic concentration is 0.6T, the pulsation frequency is 8Hz, and the flow rate of the slurry in the magnetic field is 0.2m 3 / h, the obtained concentrate is the copper-cobalt oxide pre-magnetic separation concentrate, and the obtained tailings are fed into the strong magnetic separation process;

[0262] The magnetic field strength of the strong magnetic fine sweeping is 1.0T, the pulsation frequency is 10Hz, and the flow rate of the slurry in the magnetic field is 0.3m 3 / h, the concentrate is returned to the weak magnetic concentration process, and the tailings are fed to the strong magnetic rough sweeping process;

[0263] The magnetic field strength of the strong magnetic roughing separation is 1.4T, the pulsation frequency is 10Hz, and the flow rate of the slurry in the magnetic field is 0.3m 3 / h, the concentrate is returned to the strong magnetic roughing process, and the tailings obtained are the pre-magnetic separation tailings.

[0264] (3) Copper-cobalt sulfide flotation

[0265] The pre-magnetic separation tailings concentrated to a pulp concentration of 35.01% are subjected to copper-cobalt sulfide flotation;

[0266] The copper-cobalt sulfide flotation of this embodiment includes a roughing process, a scavenging process and a concentrating process: the rough concentrate obtained in the roughing process is fed into the concentrating process; the tailings obtained in the roughing process are fed into the scavenging process; the concentrating concentrate obtained in the concentrating process is the copper-cobalt sulfide flotation concentrate; the concentrating tailings obtained in the concentrating process are returned to the roughing process; the scavenged concentrate obtained in the scavenging process is returned to the roughing process; the scavenged tailings obtained in the scavenging process are the copper-cobalt sulfide flotation tailings.

[0267] This embodiment adopts a one roughing, three scavenging and four concentrating method: the scavenged concentrate obtained in the first scavenging stage is returned to the roughing process, and the concentrate obtained in other stages is returned to the previous scavenging stage; the scavenged tailings obtained in the last stage of scavenging are copper-cobalt sulfide flotation tailings, and the tailings obtained in other stages of scavenging enter the next scavenging stage; the concentrated tailings obtained in the first concentrating stage are returned to the roughing process, and the tailings obtained in other stages of concentrating are returned to the previous concentrating stage; the concentrated concentrate obtained in the last stage of concentrating is copper-cobalt sulfide flotation concentrate, and the concentrates obtained in other stages of concentrating enter the next stage of concentrating.

[0268] The concentration in this embodiment is blank concentration, and the collector (butyl xanthate) used in the roughing and sweeping is 300 g / t (50 g / t of which comes from the return water), and the foaming agent (pine oil) is 80 g / t (15 g / t of which comes from the return water);

[0269] (4) Tailings decontamination

[0270] The copper-cobalt sulfide flotation tailings obtained in step (3) are sent to a thickener to be concentrated to 50 wt% to achieve drug removal; the concentrated overflow water is returned to the copper-cobalt sulfide flotation for use;

[0271] (5) Oxidative decomposition

[0272] Add clean water to the concentrated slurry and adjust the slurry to a slurry concentration of 32.58%. Add a clean oxidant and fill with air and stir for 10 minutes to achieve strong oxidative decomposition treatment of the residual reagents in the slurry; the clean oxidant is H2O2, and the addition amount is: 50ml / kg (50% dosage form, approximately 70g / kg).

[0273] (6) Magnetic separation

[0274] The slurry after slurry adjustment and oxidation is subjected to a strong magnetic roughing separation and a strong magnetic sweeping separation using a vertical ring high gradient magnetic separator;

[0275] The magnetic field strength of the strong magnetic roughing is 1.0T, the pulsation frequency is 12Hz, and the flow rate of the slurry in the magnetic field is 0.4m 3 / h, the tailings are fed into the strong magnetic sweeping process; the magnetic field strength of the strong magnetic sweeping is 1.2T, the pulsation frequency is 10Hz, and the flow rate of the slurry in the magnetic field is 0.3m 3 / h; the concentrates obtained from the strong magnetic roughing separation and the strong magnetic scavenging separation are combined into the copper-cobalt oxide magnetic separation concentrate, and the tailings from the strong magnetic scavenging separation are the final tailings.

[0276] The sulfur-oxygen copper-cobalt mixed ore was treated by the combined magnetic-flotation-magnetic method of first magnetic, then floatation and then magnetic again. Typical test results are shown in Table 2.

[0277] Table 2 Magnetic flotation separation test index of a sulfur-oxygen copper-cobalt ore in Congo (DRC)

[0278]

[0279] Comparative Example 1

[0280] The same raw ore as in Example 1 was selected for separation, and the difference from Example 1 was that the copper-cobalt oxide flotation tailings were not subjected to concentration and drug removal treatment, the copper-cobalt oxide flotation did not use return water, and the residual reagent in the flotation tailings was not oxidized and decomposed. The other steps were consistent with Example 1.

[0281] (1) Grinding

[0282] The copper-cobalt mixed ore is ground, the grinding water is clean water, and no reagents are added during the grinding process; the grinding fineness is -0.074mm, the particle size content is 72.13%; the slurry concentration is 30.96%.

[0283] (2) Pre-magnetic separation:

[0284] The pulp obtained by grinding is subjected to one strong magnetic roughing separation, one weak magnetic cleaning separation, one strong magnetic fine sweeping separation and one strong magnetic rough sweeping separation by using a vertical ring high gradient magnetic separator;

[0285] The detailed process of pre-magnetic separation is as follows:

[0286] The magnetic field strength of the strong magnetic roughing is 1.2T, the pulsation frequency is 12Hz, and the flow rate of the slurry in the magnetic field is 0.4m 3 / h, the concentrate obtained is fed into the weak magnetic concentration process, and the tailings obtained is fed into the strong magnetic rough sweeping process;

[0287] The magnetic field strength of weak magnetic concentration is 0.6T, the pulsation frequency is 8Hz, and the flow rate of the slurry in the magnetic field is 0.2m 3 / h, the obtained concentrate is the copper-cobalt oxide pre-magnetic separation concentrate, and the obtained tailings are fed into the strong magnetic separation process;

[0288] The magnetic field strength of the strong magnetic fine sweeping is 1.2T, the pulsation frequency is 12Hz, and the flow rate of the slurry in the magnetic field is 0.3m 3 / h, the concentrate is returned to the weak magnetic concentration process, and the tailings are fed to the strong magnetic rough sweeping process;

[0289] The magnetic field strength of the strong magnetic roughing separation is 1.3T, the pulsation frequency is 12Hz, and the flow rate of the slurry in the magnetic field is 0.3m 3 / h, the concentrate is returned to the strong magnetic roughing process, and the tailings obtained are the pre-magnetic separation tailings.

[0290] (3) Copper-cobalt sulfide flotation

[0291] The pre-magnetic separation tailings concentrated to a pulp concentration of 35.01% are subjected to copper-cobalt sulfide flotation;

[0292] The copper-cobalt sulfide flotation of this embodiment includes a roughing process, a scavenging process and a concentrating process: the rough concentrate obtained in the roughing process is fed into the concentrating process; the tailings obtained in the roughing process are fed into the scavenging process; the concentrating concentrate obtained in the concentrating process is the copper-cobalt sulfide flotation concentrate; the concentrating tailings obtained in the concentrating process are returned to the roughing process; the scavenged concentrate obtained in the scavenging process is returned to the roughing process; the scavenged tailings obtained in the scavenging process are the copper-cobalt sulfide flotation tailings.

[0293] This embodiment adopts a one roughing, three scavenging and four concentrating method: the scavenged concentrate obtained in the first scavenging stage is returned to the roughing process, and the concentrate obtained in other stages is returned to the previous scavenging stage; the scavenged tailings obtained in the last stage of scavenging are copper-cobalt sulfide flotation tailings, and the tailings obtained in other stages of scavenging enter the next scavenging stage; the concentrated tailings obtained in the first concentrating stage are returned to the roughing process, and the tailings obtained in other stages of concentrating are returned to the previous concentrating stage; the concentrated concentrate obtained in the last stage of concentrating is copper-cobalt sulfide flotation concentrate, and the concentrates obtained in other stages of concentrating enter the next stage of concentrating.

[0294] In this embodiment, the flotation of copper cobalt sulfide is blank selection. In the roughing and scavenging, a total of 135 g / t of collector (butyl xanthate) and a total of 35 g / t of frother (pine oil) are used.

[0295] (4) Copper-cobalt oxide flotation

[0296] Flotation of copper-cobalt oxide from copper-cobalt sulfide flotation tailings;

[0297] The flotation of copper-cobalt oxide in this embodiment includes a roughing process, a scavenging process and a concentrating process. The rough concentrate obtained in the roughing process is fed into the concentrating process; the tailings obtained in the roughing process are fed into the scavenging process; the concentrating concentrate obtained in the concentrating process is the copper-cobalt oxide flotation concentrate; the concentrating tailings obtained in the concentrating process are returned to the roughing process; the scavenged concentrate obtained in the scavenging process is returned to the roughing process; the scavenged tailings obtained in the scavenging process are the copper-cobalt oxide flotation tailings;

[0298] This embodiment adopts a one roughing, five scavenging and three concentrating method: the scavenged concentrate obtained from the first scavenging process is returned to the roughing process, and the concentrates obtained from the other scavenging processes are returned to the previous scavenging process; the scavenged tailings obtained from the last scavenging process are copper-cobalt oxide flotation tailings, and the tailings obtained from the other scavenging processes enter the next scavenging process; the concentrated tailings obtained from the first concentrating process are returned to the roughing process, and the tailings obtained from the other concentrating processes are returned to the previous concentrating process; the concentrated concentrate obtained from the last concentrating process is copper-cobalt oxide flotation concentrate, and the concentrates obtained from the other concentrating processes enter the next concentrating process.

[0299] In this embodiment, the flotation of copper cobalt oxide is blank selection. In the roughing and scavenging, a total of 6000 g / t of sulfiding agent (sodium hydrosulfide), a total of 400 g / t of collector (butyl xanthate), and a total of 55 g / t of frother (pine oil) are used. Since no return water is used, the dosage of the reagents is directly added.

[0300] (5) Magnetic separation

[0301] The copper-cobalt oxide flotation tailings are subjected to a strong magnetic roughing separation and a strong magnetic sweeping separation using a vertical ring high gradient magnetic separator;

[0302] The magnetic field strength of the strong magnetic roughing is 1.1T, the pulsation frequency is 10Hz, and the flow rate of the slurry in the magnetic field is 0.4m 3 / h, the tailings are fed into the strong magnetic sweeping process; the magnetic field strength of the strong magnetic sweeping is 1.2T, the pulsation frequency is 12Hz, and the flow rate of the slurry in the magnetic field is 0.3m 3 / h; the concentrates obtained from the strong magnetic roughing separation and the strong magnetic scavenging separation are combined into the copper-cobalt oxide magnetic separation concentrate, and the tailings from the strong magnetic scavenging separation are the final tailings.

[0303] The sulfur-oxygen copper-cobalt mixed ore was treated by the magnetic-flotation-magnetic combined method of first magnetic, then float and then magnetic again. Typical test results are shown in Table 3.

[0304] Table 3 Magnetic flotation separation test index of a sulfur-oxygen copper-cobalt ore in Congo (DRC)

[0305]

[0306] Compared with Example 1, the copper-cobalt oxide magnetic concentrate obtained by subsequent magnetic separation is not subjected to concentration, drug removal and oxidation decomposition treatment after flotation. Compared with Example 1, both the grade and the recovery rate are significantly reduced.

[0307] Comparative Example 2

[0308] The same raw ore as in Example 2 was selected for separation, and the difference from Example 2 was that the copper-cobalt oxide flotation tailings were not subjected to concentration and drug removal treatment, the copper-cobalt oxide flotation did not use return water, and the residual reagent in the flotation tailings was not oxidized and decomposed. The other steps were consistent with Example 2.

[0309] (1) Grinding

[0310] The copper-cobalt mixed ore is ground, and the grinding water is clean water plus concentrated return water of pre-magnetic separation tailings. No reagents are added during the grinding process; the grinding fineness is -0.074mm and the particle size content is 75.73%; the slurry concentration is 31.16%.

[0311] (2) Pre-magnetic separation

[0312] The pulp obtained by grinding is subjected to one strong magnetic roughing separation, one weak magnetic cleaning separation, one strong magnetic fine sweeping separation and one strong magnetic rough sweeping separation by using a vertical ring high gradient magnetic separator;

[0313] The detailed process of pre-magnetic separation is as follows:

[0314] The magnetic field strength of the strong magnetic roughing is 1.2T, the pulsation frequency is 10Hz, and the flow rate of the slurry in the magnetic field is 0.4m 3 / h, the concentrate obtained is fed into the weak magnetic concentration process, and the tailings obtained is fed into the strong magnetic rough sweeping process;

[0315] The magnetic field strength of weak magnetic concentration is 0.6T, the pulsation frequency is 8Hz, and the flow rate of the slurry in the magnetic field is 0.2m 3 / h, the obtained concentrate is the copper-cobalt oxide pre-magnetic separation concentrate, and the obtained tailings are fed into the strong magnetic separation process;

[0316] The magnetic field strength of the strong magnetic fine sweeping is 1.0T, the pulsation frequency is 10Hz, and the flow rate of the slurry in the magnetic field is 0.3m 3 / h, the concentrate is returned to the weak magnetic concentration process, and the tailings are fed to the strong magnetic rough sweeping process;

[0317] The magnetic field strength of the strong magnetic roughing separation is 1.4T, the pulsation frequency is 10Hz, and the flow rate of the slurry in the magnetic field is 0.3m 3 / h, the concentrate is returned to the strong magnetic roughing process, and the tailings obtained are the pre-magnetic separation tailings.

[0318] (3) Copper-cobalt sulfide flotation

[0319] The pre-magnetic separation tailings concentrated to a pulp concentration of 35.01% are subjected to copper-cobalt sulfide flotation;

[0320] The copper-cobalt sulfide flotation of this embodiment includes a roughing process, a scavenging process and a concentrating process: the rough concentrate obtained in the roughing process is fed into the concentrating process; the tailings obtained in the roughing process are fed into the scavenging process; the concentrating concentrate obtained in the concentrating process is the copper-cobalt sulfide flotation concentrate; the concentrating tailings obtained in the concentrating process are returned to the roughing process; the scavenged concentrate obtained in the scavenging process is returned to the roughing process; the scavenged tailings obtained in the scavenging process are the copper-cobalt sulfide flotation tailings.

[0321] This embodiment adopts a one roughing, three scavenging and four concentrating method: the scavenged concentrate obtained in the first scavenging stage is returned to the roughing process, and the concentrate obtained in other stages is returned to the previous scavenging stage; the scavenged tailings obtained in the last stage of scavenging are copper-cobalt sulfide flotation tailings, and the tailings obtained in other stages of scavenging enter the next scavenging stage; the concentrated tailings obtained in the first concentrating stage are returned to the roughing process, and the tailings obtained in other stages of concentrating are returned to the previous concentrating stage; the concentrated concentrate obtained in the last stage of concentrating is copper-cobalt sulfide flotation concentrate, and the concentrates obtained in other stages of concentrating enter the next stage of concentrating.

[0322] The concentration in this embodiment is blank concentration. The collector (butyl xanthate) used in the roughing and scavenging is 300 g / t in total, and the foaming agent (pine oil) is 80 g / t in total. Since no return water is used, the dosage of the reagents is directly added.

[0323] (4) Magnetic separation

[0324] The copper-cobalt sulfide flotation tailings are subjected to a strong magnetic roughing separation and a strong magnetic sweeping separation using a vertical ring high gradient magnetic separator;

[0325] The magnetic field strength of the strong magnetic roughing is 1.0T, the pulsation frequency is 12Hz, and the flow rate of the slurry in the magnetic field is 0.4m 3 / h, the tailings are fed into the strong magnetic sweeping process; the magnetic field strength of the strong magnetic sweeping is 1.2T, the pulsation frequency is 10Hz, and the flow rate of the slurry in the magnetic field is 0.3m 3 / h; the concentrates obtained from the strong magnetic roughing separation and the strong magnetic scavenging separation are combined into the copper-cobalt oxide magnetic separation concentrate, and the tailings from the strong magnetic scavenging separation are the final tailings.

[0326] The sulfur-oxygen copper-cobalt mixed ore was treated by the combined magnetic-flotation-magnetic method of first magnetic, then floatation and then magnetic again. Typical test results are shown in Table 4.

[0327] Table 4 Magnetic flotation separation test index of a sulfur-oxygen copper-cobalt ore in Congo (DRC)

[0328]

[0329] Compared with Example 2, this comparative example does not undergo concentration, drug removal and oxidation decomposition treatment after flotation. The copper-cobalt oxide magnetic separation concentrate obtained by subsequent magnetic separation has a significant decrease in grade and recovery rate compared with Example 2.

[0330] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for improving the magnetic separation effect of tailings obtained by flotation of sulfur-oxygen copper-cobalt mixed ore, characterized in that: The following steps are involved: (1) Tailings decontamination: The tailings obtained by flotation of sulfur-oxygen copper-cobalt mixed ore are concentrated and decontaminated to obtain concentrated ore pulp; (2) Oxidative decomposition: diluting the concentrated slurry, adding an oxidant and / or injecting air for decomposition treatment, and the resulting slurry is used for magnetic separation.

2. The method for improving the magnetic separation effect of tailings obtained by flotation of sulfur-oxygen copper-cobalt mixed ore according to claim 1, characterized in that: The copper grade of the oxysulfide copper-cobalt mixed ore is 2.0wt%-4.0wt%, the cobalt grade is 0.1wt%-0.4wt%, and the oxidation rate is 15wt%-85wt%; in step (1), the concentration of the concentrated slurry is 50wt%-55wt%; in step (2), the concentrated slurry is diluted to a concentration of 30wt%-35wt%; in step (2), the oxidant is H2O2; in step (2), the amount of the oxidant used is 30-150g / kg.

3. The method for improving the magnetic separation effect of tailings obtained by flotation of sulfur-oxygen copper-cobalt mixed ore according to claim 1 or 2, characterized in that: The sulfur-oxygen copper-cobalt mixed ore is also pre-magnetically separated before flotation; the pre-magnetic separation includes a strong magnetic roughing separation process and a weak magnetic concentration process; the coarse concentrate obtained in the strong magnetic roughing separation process of the pre-magnetic separation is fed into the weak magnetic concentration process of the pre-magnetic separation; the concentrate obtained in the weak magnetic concentration process of the pre-magnetic separation is the oxide copper-cobalt pre-magnetic separation concentrate; The magnetic field intensity of the strong magnetic roughing process of pre-magnetic separation is above 0.9T; The magnetic field strength of the weak magnetic separation process of pre-magnetic separation is 0.2-0.7T.

4. The method for improving the magnetic separation effect of tailings obtained by flotation of sulfur-oxygen copper-cobalt mixed ore according to claim 3, characterized in that: The ore pulp fed into the pre-magnetic separation is: a slurry formed by grinding the oxysulfide copper-cobalt mixed ore to a particle size content of 70wt%-77wt% with a fineness of -0.074mm; the concentration of the ore pulp fed into the pre-magnetic separation is 30wt%-35wt%; the tailings of the pre-magnetic separation are also concentrated before being fed into the oxysulfide copper-cobalt mixed ore flotation to a slurry concentration of 35wt%-40wt%.

5. The method for improving the magnetic separation effect of tailings obtained by flotation of sulfur-oxygen copper-cobalt mixed ore according to claim 3 or 4, characterized in that: The pre-magnetic separation also includes a strong magnetic fine sweeping process; the tailings obtained from the weak magnetic concentrating process of the pre-magnetic separation are fed into the strong magnetic fine sweeping process of the pre-magnetic separation; the concentrate obtained from the strong magnetic fine sweeping process of the pre-magnetic separation is returned to the weak magnetic concentrating process of the pre-magnetic separation; The pre-magnetic separation also includes a strong magnetic roughing separation process; the tailings obtained from the strong magnetic roughing separation process of the pre-magnetic separation are fed into the strong magnetic roughing separation process of the pre-magnetic separation; the tailings obtained from the strong magnetic fine sweeping separation process of the pre-magnetic separation are fed into the strong magnetic roughing separation process of the pre-magnetic separation; the concentrate obtained from the strong magnetic roughing separation process of the pre-magnetic separation is returned to the strong magnetic roughing separation process of the pre-magnetic separation; the tailings obtained from the strong magnetic roughing separation process of the pre-magnetic separation are the tailings of the pre-magnetic separation; The strong magnetic roughing process of the pre-magnetic separation: the magnetic field strength is 1.1-1.2T, the pulsation frequency is 8-14Hz, and the flow rate of the slurry in the magnetic field is 0.2-0.4m 3 / h; The magnetic field strength of the weak magnetic separation process of the pre-magnetic separation is 0.4-0.6T, the pulsation frequency is 8-12Hz, and the flow rate of the slurry in the magnetic field is 0.2-0.4m 3 / h; The strong magnetic fine sweeping process of the pre-magnetic separation: the magnetic field strength is 1.0-1.2T, the pulsation frequency is 8-14Hz, and the flow rate of the slurry in the magnetic field is 0.2-0.4m 3 / h; The strong magnetic rough sweeping process of the pre-magnetic separation: the magnetic field strength is 1.1-1.4T, the pulsation frequency is 8-14Hz, and the flow rate of the slurry in the magnetic field is 0.2-0.4m 3 / h; The pre-magnetic separation adopts a high gradient magnetic separator.

6. The method for improving the magnetic separation effect of tailings obtained by flotation of sulfur-oxygen copper-cobalt mixed ore according to any one of claims 1 to 5, characterized in that: The magnetic separation of tailings obtained from the flotation of sulfur-oxygen copper-cobalt mixed ore includes a strong magnetic roughing separation process and a strong magnetic scavenging separation process; the roughing tailings obtained in the strong magnetic roughing separation process of the magnetic separation are fed into the strong magnetic scavenging separation process of the magnetic separation; the concentrate obtained in the strong magnetic roughing separation process and the strong magnetic scavenging separation process of the magnetic separation is an oxide copper-cobalt magnetic separation concentrate.

7. The method for improving the magnetic separation effect of tailings obtained by flotation of sulfur-oxygen copper-cobalt mixed ore according to claim 6, characterized in that: In the strong magnetic roughing process of the magnetic separation, the magnetic field strength is 1.0-1.1T, the pulsation frequency is 8-12Hz, and the flow rate of the slurry in the magnetic field is 0.3-0.4m 3 / h; the strong magnetic sweeping process of the magnetic separation has a magnetic field strength of 1.1-1.2T, a pulsation frequency of 8-12Hz, and a slurry flow rate in the magnetic field of 0.2-0.3m 3 / h; the magnetic separation adopts a high gradient magnetic separator.

8. The method for improving the magnetic separation effect of tailings obtained by flotation of sulfur-oxygen copper-cobalt mixed ore according to any one of claims 1 to 7, characterized in that: The flotation of the oxysulfide copper-cobalt mixed ore includes the flotation of copper-cobalt sulfide, or includes the flotation of copper-cobalt oxide and the flotation of copper-cobalt sulfide.

9. The method for improving the magnetic separation effect of tailings obtained by flotation of sulfur-oxygen copper-cobalt mixed ore according to claim 8, characterized in that: The sulfiding agent used in the flotation of copper-cobalt oxide is sodium hydrosulfide; the collector used in the flotation of copper-cobalt oxide is butyl xanthate; the frother used in the flotation of copper-cobalt oxide is pine oil; in the flotation of copper-cobalt oxide, the total amount of sulfiding agent is 5000-6000g / t; in the flotation of copper-cobalt oxide, the total amount of collector is 200-550g / t; in the flotation of copper-cobalt oxide, the total amount of frother is 60-100g / t; the flotation of copper-cobalt oxide includes a roughing process and a scavenging process, or includes a roughing process, a scavenging process and a concentrating process; The collector used in the copper-cobalt sulfide flotation is butyl xanthate; the frother used in the copper-cobalt sulfide flotation is pine oil; in the copper-cobalt sulfide flotation, the total amount of the collector is 100-550 g / t; in the copper-cobalt sulfide flotation, the total amount of the frother is 20-100 g / t; the copper-cobalt sulfide flotation includes a roughing process and a scavenging process, or includes a roughing process, a scavenging process and a concentrating process.

10. The method for improving the magnetic separation effect of tailings obtained by flotation of sulfur-oxygen copper-cobalt mixed ore according to claim 9, characterized in that: The scavenging process of the copper-cobalt oxide flotation includes more than two stages of scavenging; the concentrating process of the copper-cobalt oxide flotation includes more than two stages of concentrating: the concentrating process of the copper-cobalt oxide flotation is blank concentrating; The scavenging process of the copper-cobalt sulfide flotation includes more than two stages of scavenging; the concentrating process of the copper-cobalt sulfide flotation includes more than two stages of concentrating: the concentrating process of the copper-cobalt sulfide flotation is blank concentrating.

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