Collectors and flotation processes of copper sulphide ores

Abstract

The application provides a collector and a flotation process of copper sulfide ore. The collector comprises, in parts by weight, 100 parts of a sulfide urethane compound, 10-20 parts of (methyl) benzotriazole (sodium) and 10-20 parts of a cosolvent. In the flotation operation, the (methyl) benzotriazole (sodium) can be adsorbed and chelated with active copper atoms or copper ions on the surface of the copper sulfide ore, thereby forming a hydrophobic protective film on the surface of the copper sulfide ore, and further improving the hydrophobicity of the copper sulfide ore. The sulfide urethane compound has good selectivity for the copper sulfide. The cosolvent can promote the dissolution and dispersion of the sulfide urethane compound and the (methyl) benzotriazole (sodium) in the ore pulp. Compared with other ranges, limiting the amount of the above components in the above range is beneficial to the synergistic effect of the three, the collection capacity of the collector and the hydrophobicity of the copper sulfide ore, and further improving the copper recovery rate under the premise of ensuring the grade of copper concentrate.

Description

Technical Field

[0001] This invention relates to the field of mineral processing technology, and more specifically, to a collector and a flotation process for copper sulfide ore. Background Technology

[0002] Copper is a non-ferrous metal closely related to human life, widely used in electrical, light industry, and defense industries. Copper sulfide ores are important copper resources, and flotation is commonly used for enrichment and recovery. Currently, xanthates, black reagents, sulfur-nitrogen compounds, and sulfur-amino esters are used as collectors for copper sulfide ores. Among them, xanthates are widely used and have strong collecting ability, but poor selectivity; black reagents and sulfur-amino esters have good selectivity and relatively good copper collection effects. Due to the limitations of single collectors, researchers have developed many combined collectors by utilizing the synergistic effects between reagents to improve the selectivity of copper ores and the collector's ability. For example, existing literature uses xanthate diester, butylammonium black powder, and modifiers as copper mineral collectors. Existing literature uses ethyl propylthiocyanate, diethylaminodithiocarbamate cyanoethyl ester, and butyl xanthate as a copper composite collector. Existing literature (publication number CN109158217A) uses dialkyl phosphate, octylphenol polyoxyethylene ether, stearic acid polyoxyethylene ester, triethylenetetramine, o-hydroxybenzoic acid, and activator as copper mineral collectors, which have the advantages of strong collector ability and good selectivity.

[0003] While the existing literature demonstrates the effects and advantages of combined drug therapy, some drug formulations are too complex, and some drug combinations, while having strong collecting power, have reduced selectivity.

[0004] Therefore, it is necessary to develop a collector that can simultaneously improve both the collecting capacity and selectivity, which is of great significance for improving the grade of copper concentrate and the copper recovery rate. Summary of the Invention

[0005] The main objective of this invention is to provide a collector and a flotation process for copper sulfide ore, so as to solve the problem that the collector and flotation process in the prior art cannot simultaneously improve the grade of copper concentrate and the copper recovery rate.

[0006] To achieve the above objectives, the present invention provides a collector comprising, by weight: 100 parts of a thiouric acid ester compound, 10-20 parts of (methyl)benzotriazole (sodium) and 10-20 parts of a cosolvent.

[0007] Furthermore, the thiourethane compound is selected from one or more of the group consisting of ethyl thiocarbamate, propyl thiocarbamate, and O-isopropyl-N-ethyl thiocarbamate; the cosolvent is selected from one or more of the group consisting of polyethylene glycol, glycerol, and polyoxyethylene ether.

[0008] Furthermore, the molecular weight of polyethylene glycol is 200–600.

[0009] Furthermore, by weight, the collector comprises: 100 parts of a thiouric acid ester compound, 15-20 parts of (methyl)benzotriazole (sodium), and 10-15 parts of a cosolvent.

[0010] To achieve the above objectives, another aspect of the present invention provides a flotation process for copper sulfide ore, the flotation process comprising: step S1, crushing and grinding the copper sulfide ore to obtain a slurry; step S2, mixing the slurry, a first collector, and a frother and performing roughing to obtain a rough copper concentrate and rough copper tailings; step S3, refining the rough copper concentrate to obtain a copper concentrate; and step S4, mixing the rough copper tailings with a second collector and performing scavenging to obtain tailings and scavenging froth; wherein the first collector is any one of claims 1 to 4, and the second collector may be the same as or different from the first collector.

[0011] Furthermore, the slurry includes mineral particles, with mineral particles smaller than 0.074 mm accounting for 65-75% by weight of the copper sulfide ore.

[0012] Furthermore, the solid content of the slurry is 25–35 wt% based on the total weight of the slurry.

[0013] Furthermore, the weight ratio of copper sulfide ore, the first collector, and the frother is 1×10⁻⁶. 5 The weight ratio of the first collector to the second collector is (4-6):(1.5-3); preferably, during the mixing process in step S2, the material including the slurry, the first collector and the frother is stirred; wherein, the stirring time is 2-4 min; preferably, the frother is selected from methyl isobutyl methanol and / or pine oil; preferably, the second collector is the same as the first collector.

[0014] Furthermore, the grinding process includes: mixing copper sulfide ore with an inhibitor and adjusting the pH of the slurry to 10–11; preferably, the weight ratio of the inhibitor to copper sulfide ore is (5–10):1×10 4 Preferably, the inhibitor is selected from one or more of the group consisting of calcium oxide, calcium hydroxide, and sodium hydroxide.

[0015] Furthermore, step S3 also includes: sequentially performing a first cleaning and a second cleaning on the rough copper concentrate to obtain copper concentrate; step S4 also includes: mixing the rough copper tailings with a second collector and sequentially performing a first scavenging and a second scavenging to obtain tailings and scavenging foam; preferably, the scavenging foam is reused in step S4 or step S2.

[0016] Applying the technical solution of this invention, in flotation operations, (methyl)benzotriazole (sodium) can adsorb and chelate with active copper atoms or copper ions on the surface of copper sulfide ore, thereby forming a hydrophobic protective film on the surface of the copper sulfide ore and improving its hydrophobicity. Thioamino ester compounds show good selectivity for copper sulfide. The co-solvent promotes the dissolution and dispersion of thioamino ester compounds and (methyl)benzotriazole (sodium) in the pulp. Compared to other ranges, limiting the amounts of the aforementioned thioamino ester compounds, (methyl)benzotriazole (sodium), and co-solvent within the above-mentioned ranges is beneficial to exert the synergistic effect of the three, improve the collecting ability of the collector and the hydrophobicity of the copper sulfide ore, and thus increase the copper recovery rate while ensuring the grade of the copper concentrate. Attached Figure Description

[0017] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0018] Figure 1 A schematic flow chart of the flotation process for copper sulfide ore in Example 1 is shown. Detailed Implementation

[0019] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the embodiments.

[0020] As described in the background section, existing collectors and flotation processes have limitations in simultaneously improving copper concentrate grade and copper recovery rate. To address these technical problems, this application provides a collector comprising, by weight: 100 parts of a thiocyanate compound, 10-20 parts of (methyl)benzotriazole (sodium), and 10-20 parts of a co-solvent.

[0021] In flotation, (methyl)benzotriazole (sodium) can adsorb and chelate with active copper atoms or ions on the surface of copper sulfide ore, forming a hydrophobic protective film on the surface of the copper sulfide ore, thereby improving its hydrophobicity. Thioamino esters show good selectivity for copper sulfide. The co-solvent promotes the dissolution and dispersion of thioamino esters and (methyl)benzotriazole (sodium) in the pulp. Compared to other ranges, limiting the amounts of the aforementioned thioamino esters, (methyl)benzotriazole (sodium), and co-solvent within the above-mentioned ranges is beneficial for maximizing their synergistic effect, improving the collector's collecting ability and the hydrophobicity of the copper sulfide ore, and thus increasing copper recovery while ensuring copper concentrate grade.

[0022] In a preferred embodiment, the thiourethane compounds include, but are not limited to, one or more of the group consisting of ethyl thiocarbamate, propyl thiocarbamate, and O-isopropyl-N-ethyl thiocarbamate; the co-solvents include, but are not limited to, one or more of the group consisting of polyethylene glycol, glycerol, and polyoxyethylene ether. Compared to other types, using the above-mentioned thiourethane compounds is beneficial for improving the selectivity for copper sulfide; at the same time, using the above-mentioned co-solvents is beneficial for improving the solubility and dispersion of thiourethane compounds and (methyl)benzotriazole (sodium) in the pulp, and polyethylene glycol also has foaming ability, which can improve the flotation effect and help reduce the amount of foaming agent added in the flotation operation.

[0023] In a preferred embodiment, the molecular weight of polyethylene glycol is 200 to 600. The molecular weight of polyethylene glycol includes, but is not limited to, the above range. Limiting it to this range helps to further enhance the foaming ability of polyethylene glycol, further improve the flotation effect, and further reduce the amount of foaming agent used.

[0024] In a preferred embodiment, the collector, by weight, comprises: 100 parts of a thiocyanate compound, 15-20 parts of (methyl)benzotriazole (sodium), and 10-15 parts of a co-solvent. The amounts of the thiocyanate compound, (methyl)benzotriazole (sodium), and co-solvent are not limited to the ranges described above. Limiting these amounts to the ranges helps to further enhance the synergistic effect of the three components, further improve the collecting ability of the collector and the hydrophobicity of copper sulfide ore, thereby further improving the copper recovery rate.

[0025] The second aspect of this application also provides a flotation process for copper sulfide ore, which includes: step S1, crushing and grinding the copper sulfide ore to obtain a slurry; step S2, mixing the slurry, a first collector, and a frother and performing roughing to obtain a rough copper concentrate and rough copper tailings; step S3, refining the rough copper concentrate to obtain a copper concentrate; and step S4, mixing the rough copper tailings with a second collector and performing scavenging to obtain tailings and scavenging froth; wherein the first collector is the collector provided in this application, and the second collector may be the same as or different from the first collector.

[0026] In the flotation process for copper sulfide ore provided in this application, the copper sulfide ore is first crushed and ground to obtain a slurry for roughing. Then, the slurry, a first collector, and a frother are mixed and roughed. The (methyl)benzotriazole (sodium) in the collector can adsorb and chelate with active copper atoms or copper ions on the surface of the copper sulfide ore, thereby forming a hydrophobic protective film on the surface of the copper sulfide ore and improving its hydrophobicity. The co-solvent reduces the surface tension of the aqueous solution, making it easier for air introduced into the water to disperse into stable bubbles. This allows the frother and collector to adhere together to the surface of the mineral particles, causing the mineral particles to float.

[0027] Through the synergistic effect of the highly selective and highly recoverable first collector and frother, the slurry achieves a good initial separation effect. The rougher copper concentrate and rougher copper tailings obtained after roughing contain the first collector and frother remaining from the roughing process. The synergistic effect of the first collector and frother is sufficient to further refine the rougher copper concentrate, resulting in a high-grade copper concentrate. A second collector is then added to the rougher copper tailings for scavenging, further separating the useful copper sulfide components and thus improving the copper recovery rate. Therefore, using the first collector provided in this application in the flotation process of copper sulfide ore results in a better separation effect, ultimately leading to a high-grade copper and further improving the copper recovery rate.

[0028] In a preferred embodiment, the slurry comprises mineral particles, wherein mineral particles with a diameter less than 0.074 mm account for 65-75% by weight of the copper sulfide ore. The collector provided in this application is particularly suitable for the flotation of the aforementioned specific content of mineral particles with a diameter less than 0.074 mm, thereby obtaining a higher copper grade and copper recovery rate.

[0029] In a preferred embodiment, the solids content of the pulp is 25-35 wt% of the total weight of the pulp. The solids content of the pulp includes, but is not limited to, the above range. Limiting it to the above range is beneficial for providing good preconditions for subsequent flotation operations and facilitates the flotation process.

[0030] The addition of collectors and frothers is beneficial to improving the flotation effect of copper sulfide ore. In a preferred embodiment, the weight ratio of copper sulfide ore, the first collector, and the frother is 1×10⁻⁶. 5The weight ratio of the first collector to the second collector is (4-6):(1.5-3); the weight ratio of copper sulfide ore, the first collector, and the frother is (4-6):(1-2). The weight ratio of copper sulfide ore, the first collector, and the frother is not limited to the above range. Limiting it to the above range is beneficial to further enhance the role of the first collector and the frother, and to create a synergistic effect between the two, thereby further improving the flotation effect. At the same time, by reasonably controlling the dosage of the first collector and the frother, it is beneficial to further reduce unnecessary waste of the first collector and the frother, and thus further reduce production costs. Meanwhile, the weight ratio of the first collector to the second collector is not limited to the above range. Limiting it to the above range is beneficial to further enhance the collecting performance of the second collector, so that copper and impurities in the roughing copper tailings can be further separated, which is beneficial to further reduce the loss of copper in the final tailings, thereby further improving the copper recovery rate.

[0031] To further improve the flotation effect, preferably, during the mixing process in step S2, the materials including slurry, first collector and frother are stirred; wherein the stirring time is 2 to 4 minutes.

[0032] To further improve the flotation effect, preferably, the frother includes, but is not limited to, methyl isobutyl methanol and / or pine oil.

[0033] To ensure the highest possible copper grade and recovery rate, and to simplify the operation process, it is preferable that the second collector is the same as the first collector.

[0034] In a preferred embodiment, the grinding process includes mixing copper sulfide ore with an inhibitor and adjusting the pH of the slurry to 10-11. The pH of the slurry includes, but is not limited to, the range described above. Limiting it to this range helps to suppress the inhibitory effect of excessively high pH on copper sulfide, while avoiding problems such as clumping and pipe blockage due to excessive inhibitor dosage, and sticky slurry foam. To further enhance the inhibitory effect on pyrite and increase the flotation rate of copper, the weight ratio of inhibitor to copper sulfide ore is (5-10):1×10. 4 .

[0035] In a preferred embodiment, the inhibitor includes, but is not limited to, one or more of the group consisting of calcium oxide, calcium hydroxide, and sodium hydroxide. When the copper sulfide ore to be treated contains pyrite and has a high sulfur content, Ca... 2+ It adsorbs onto the surface of pyrite contained in copper sulfide ore and generates insoluble compounds such as CaSO4, thereby producing an inhibitory effect; at the same time, it also helps to increase the pH value of the slurry.

[0036] In a preferred embodiment, step S3 further includes: sequentially performing a first cleaning and a second cleaning on the rough copper concentrate to obtain copper concentrate; step S4 further includes: mixing the rough copper tailings with a second collector and sequentially performing a first scavenging and a second scavenging to obtain tailings and scavenging foam.

[0037] In one alternative implementation, when the number of scavenging operations is two, the second collector is added in two separate scavenging operations.

[0038] In another optional embodiment, when the number of sweeps is two, the second collector includes two different collectors, denoted as component A and component B, respectively; component A is added during the second sweep and component B is added during the third sweep, and components A and B are selected from the collectors provided in this application or collectors commonly used in the art.

[0039] Preferably, component A is added to the copper roughing tailings and stirred for 2 minutes to perform the first scavenging operation (denoted as copper scavenging I, e.g.) Figure 1 As shown), the first scavenging froth product is returned to the roughing operation; after adding component B to the scavenging tailings and stirring for 2 minutes, a second scavenging operation is performed (referred to as copper scavenging II, as shown). Figure 1 As shown), the foam product from the second scavenging is returned to the first scavenging operation, and the tailings from the second scavenging are the final tailings.

[0040] In a preferred embodiment, the scavenging foam is reused in step S4 or step S2. Reusing the scavenging foam in step S4 or step S2 helps to further improve the copper recovery rate.

[0041] The present application will be further described in detail below with reference to specific embodiments, which should not be construed as limiting the scope of protection claimed in the present application.

[0042] Example 1

[0043] A copper sulfide ore (i.e., a copper sulfide ore) Figure 1 The raw ore shown contains 0.52 wt% copper and 4.21 wt% sulfur. Copper and sulfur exist as sulfides, while silicon exists as gangue minerals. Specifically, copper-bearing minerals include chalcopyrite, other sulfides include pyrite, and gangue minerals include silicate minerals such as quartz and feldspar.

[0044] like Figure 1 As shown, a flotation process for copper sulfide ore includes:

[0045] Step S1: The copper sulfide ore is crushed and ground, calcium oxide is added, and the pH of the slurry is adjusted to 10.5. The solid content of the slurry is 32 wt% based on the total weight of the slurry. Mineral particles with a particle size of less than 0.074 mm account for 70% of the copper sulfide ore by weight percentage.

[0046] Step S2 involves mixing the above-prepared slurry, the first collector, and methyl isobutyl methanol (MIBC) (stirring time 2 min) and performing roughing to obtain roughed copper concentrate and roughed copper tailings. The first collector, by weight, comprises 100 parts O-isopropyl-N-ethyl thiocarbamate, 10 parts sodium benzotriazole, and 20 parts polyethylene glycol (molecular weight 300), and the weight ratio of copper sulfide ore, the first collector, and MIBC is 1 × 10⁻⁶. 5 :5:1.5.

[0047] Step S3: The rough copper concentrate is subjected to copper refining I and copper refining II in sequence to obtain copper concentrate.

[0048] Step S4: Add component A to the copper roughing tailings and stir for 2 minutes to perform the first scavenging operation (denoted as copper scavenging I). Figure 1 (As shown). The frothy product from the first scavenging is returned to the roughing operation. After adding component B to the scavenging tailings and stirring for 2 minutes, a second scavenging operation is performed (denoted as copper scavenging II, as shown). Figure 1 (As shown). In the first and second collectors, component A and component B have the same composition. The froth product from the second scavenging is returned to the first scavenging operation, and the tailings from the second scavenging are the final tailings. The weight ratio of copper sulfide ore to component A in scavenging I is 1 × 10⁻⁶. 5 1.5. In scavenging II, the weight ratio of copper sulfide ore to component B is 1×10⁻⁶. 5 :1.

[0049] After one roughing, two cleaning, and two scavenging operations, the copper grade of the tailings was measured to be 26.32%; the copper recovery rate was 91.34 wt%.

[0050] Example 2

[0051] The difference from Example 1 is that, by weight, the first collector comprises 100 parts of O-isopropyl-N-ethyl thiocarbamate, 20 parts of sodium benzotriazole and 20 parts of polyethylene glycol.

[0052] The tailings were obtained by performing the same roughing, cleaning, and scavenging operations as in Example 1.

[0053] Example 3

[0054] The difference from Example 1 is that the thiourethane compound in component A and component B of the first collector and the second collector is ethyl thiocarbamate.

[0055] The tailings were obtained by performing the same roughing, cleaning, and scavenging operations as in Example 1.

[0056] Example 4

[0057] The difference from Example 1 is that the thiourethane compound in component A and component B of the first collector and the second collector is propyl-thiocarbamate.

[0058] The tailings were obtained by performing the same roughing, cleaning, and scavenging operations as in Example 1.

[0059] Example 5

[0060] The difference from Example 1 is that the molecular weight of polyethylene glycol is 200.

[0061] The tailings were obtained by performing the same roughing, cleaning, and scavenging operations as in Example 1.

[0062] Example 6

[0063] The difference from Example 1 is that the molecular weight of polyethylene glycol is 600.

[0064] The tailings were obtained by performing the same roughing, cleaning, and scavenging operations as in Example 1.

[0065] Example 7

[0066] The difference from Example 1 is that the molecular weight of polyethylene glycol is 1000.

[0067] The tailings were obtained by performing the same roughing, cleaning, and scavenging operations as in Example 1.

[0068] Example 8

[0069] The difference from Example 1 is that the first collector includes: 100 parts of O-isopropyl-N-ethyl thiocarbamate, 15 parts of sodium benzotriazole and 10 parts of polyethylene glycol.

[0070] The tailings were obtained by performing the same roughing, cleaning, and scavenging operations as in Example 1.

[0071] Example 9

[0072] The difference from Example 1 is that the first collector includes: 100 parts of O-isopropyl-N-ethyl thiocarbamate, 20 parts of sodium benzotriazole and 15 parts of polyethylene glycol.

[0073] The tailings were obtained by performing the same roughing, cleaning, and scavenging operations as in Example 1.

[0074] Example 10

[0075] The difference from Example 1 is that the weight ratio of copper sulfide ore, the first collector, and the frother is 1×10. 5 :4:3.

[0076] The tailings were obtained by performing the same roughing, cleaning, and scavenging operations as in Example 1.

[0077] Example 11

[0078] The difference from Example 1 is that the weight ratio of copper sulfide ore, the first collector, and the frother is 1×10. 5 :6:1.5.

[0079] The tailings were obtained by performing the same roughing, cleaning, and scavenging operations as in Example 1.

[0080] Example 12

[0081] The difference from Example 1 is that the weight ratio of copper sulfide ore, the first collector, and the frother is 1×10. 5 :2:4.

[0082] The tailings were obtained by performing the same roughing, cleaning, and scavenging operations as in Example 1.

[0083] Example 13

[0084] The difference from Example 1 is that the pH of the slurry is adjusted to 9.

[0085] The tailings were obtained by performing the same roughing, cleaning, and scavenging operations as in Example 1.

[0086] Comparative Example 1

[0087] The difference from Example 1 is that, by weight, the first collector comprises 100 parts of O-isopropyl-N-ethyl thiocarbamate, 5 parts of sodium benzotriazole and 20 parts of polyethylene glycol.

[0088] The tailings were obtained by performing the same roughing, cleaning, and scavenging operations as in Example 1.

[0089] Comparative Example 2

[0090] The difference from Example 1 is that, by weight, the first collector comprises 100 parts of O-isopropyl-N-ethyl thiocarbamate, 30 parts of sodium benzotriazole and 20 parts of polyethylene glycol.

[0091] The tailings were obtained by performing the same roughing, cleaning, and scavenging operations as in Example 1.

[0092] Comparative Example 3

[0093] The difference from Example 1 is that the first collector is O-isopropyl-N-ethyl thiocarbamate and does not contain any other components.

[0094] The tailings were obtained by performing the same roughing, cleaning, and scavenging operations as in Example 1.

[0095] The copper grade and copper recovery rate of the tailings obtained in all the above embodiments and comparative examples of this application are summarized in Table 1.

[0096] Table 1

[0097] Copper grade (%) Copper recovery rate (wt%) Example 1 26.32 91.34 Example 2 26.34 91.88 Example 3 26.37 91.72 Example 4 26.11 92.04 Example 5 26.42 91.63 Example 6 26.23 92.01 Example 7 25.82 91.44 Example 8 26.45 91.87 Example 9 26.37 92.06 Example 10 26.23 91.54 Example 11 26.45 91.45 Example 12 26.31 90.82 Example 13 25.85 92.23 Comparative Example 1 26.39 90.89 Comparative Example 2 26.41 90.61 Comparative Example 3 26.11 89.94

[0098] As can be seen from the above description, the embodiments of the present invention achieve the following technical effects:

[0099] Comparative Examples 1, 3, and 4, as well as Comparative Example 3, show that during flotation, sodium benzotriazole can adsorb and chelate with active copper atoms or copper ions on the surface of copper sulfide ore, thereby forming a hydrophobic protective film on the surface of the copper sulfide ore and improving its hydrophobicity. Thioamino ester compounds exhibit good selectivity for copper sulfide. The co-solvent promotes the dissolution and dispersion of thioamino ester compounds and sodium benzotriazole in the pulp.

[0100] Comparing Example 1 with Comparative Examples 1 and 2, it can be seen that, compared with other ranges, limiting the amount of O-isopropyl-N-ethyl thiocarbamate, sodium benzotriazole and polyethylene glycol to the preferred range of this application is beneficial to exert the synergistic effect of the three, which is beneficial to improve the collecting ability of the collector and the hydrophobicity of copper sulfide ore, thereby improving the copper recovery rate while ensuring the grade of copper concentrate.

[0101] Comparing Examples 1, 5 to 7, it can be seen that the molecular weight of polyethylene glycol includes, but is not limited to, the preferred range of this application. Limiting it to the preferred range of this application is beneficial to further enhance the foaming ability of polyethylene glycol, improve the flotation effect, and further save the amount of foaming agent used.

[0102] Comparing Examples 1, 8, and 9, it can be seen that the amounts of thiourethane compounds, sodium benzotriazole, and co-solvents include, but are not limited to, the preferred range of this application. Limiting them to the preferred range of this application is beneficial to further enhance the synergistic effect of the three, improve the collecting ability of the collector and the hydrophobicity of copper sulfide ore, and thus further improve the copper recovery rate.

[0103] Comparing Examples 1, 10 to 12, it is evident that, compared to other value ranges, limiting the weight ratio of slurry, the first collector, and the frother within the preferred range of this application is beneficial for further enhancing the effects of the first collector and the frother, creating a synergistic effect that further improves the flotation effect. Simultaneously, by rationally controlling the dosage of the first collector and the frother, unnecessary waste of the first collector and the frother can be further reduced, thereby further lowering production costs.

[0104] Comparing Examples 1 and 13, the pH of the slurry includes, but is not limited to, the preferred range of this application. Limiting it to the preferred range of this application is beneficial to suppress the inhibitory effect of excessively high pH on copper sulfide, while avoiding problems such as clumping and blockage of pipelines and sticky foaming of the slurry caused by excessive dosage of inhibitor.

[0105] It should be noted that the terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such terms can be used interchangeably where appropriate so that the embodiments of this application described herein can be implemented, for example, in a sequence other than those described herein.

[0106] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A collector, characterized in that, The collector, by weight, comprises: 100 parts of a thiourethane compound, 10-20 parts of sodium benzotriazole, and 10-20 parts of a co-solvent; the thiourethane compound is selected from one or more of the group consisting of ethyl thiocarbamate, propyl thiocarbamate, and O-isopropyl-N-ethyl thiocarbamate; the co-solvent is selected from one or more of the group consisting of polyethylene glycol, glycerol, and polyoxyethylene ether.

2. The collector according to claim 1, characterized in that, The molecular weight of the polyethylene glycol is 200 to 600.

3. The collector according to claim 1 or 2, characterized in that, The collector comprises, by weight, 100 parts of the thiouric acid ester compound, 15-20 parts of the sodium benzotriazole and 10-15 parts of the cosolvent.

4. A flotation process for copper sulfide ore, characterized in that, The flotation process for the copper sulfide ore includes: Step S1: The copper sulfide ore is crushed and ground to obtain a slurry; Step S2: The material including the slurry, the first collector and the frother is mixed and roughed to obtain roughed copper concentrate and roughed copper tailings. Step S3, the rough copper concentrate is further refined to obtain copper concentrate; and Step S4: The rough copper tailings are mixed with the second collector and scavenged to obtain tailings and scavenging froth; wherein the first collector is the collector according to any one of claims 1 to 3, and the second collector may be the same as or different from the first collector.

5. The flotation process for copper sulfide ore according to claim 4, characterized in that, The slurry comprises mineral particles, of which 65-75% by weight are mineral particles with a diameter less than 0.074 mm.

6. The flotation process for copper sulfide ore according to claim 4, characterized in that, The solid content of the slurry is 25-35 wt% of the total weight of the slurry.

7. The flotation process for copper sulfide ore according to any one of claims 4 to 6, characterized in that, The weight ratio of the copper sulfide ore, the first collector, and the frother is 1×10. 5 :(4~6):(1.5~3); The weight ratio of the first collector to the second collector is (4~6):(1~2).

8. The flotation process for copper sulfide ore according to claim 4, characterized in that, In the mixing process of step S2, the materials including the slurry, the first collector and the foaming agent are stirred; wherein the stirring time is 2 to 4 minutes.

9. The flotation process for copper sulfide ore according to claim 4, characterized in that, The foaming agent is selected from methyl isobutyl methanol and / or pine oil.

10. The flotation process for copper sulfide ore according to claim 4, characterized in that, The second collector is the same as the first collector.

11. The flotation process for copper sulfide ore according to claim 7, characterized in that, The grinding process includes: mixing the copper sulfide ore with an inhibitor and adjusting the pH of the slurry to 10-11.

12. The flotation process for copper sulfide ore according to claim 11, characterized in that, The weight ratio of the inhibitor to the copper sulfide ore is (5-10):1×10 4 .

13. The flotation process for copper sulfide ore according to claim 11, characterized in that, The inhibitor is selected from one or more of the group consisting of calcium oxide, calcium hydroxide, and sodium hydroxide.

14. The flotation process for copper sulfide ore according to claim 11, characterized in that, Step S3 further includes: performing a first cleaning and a second cleaning sequentially on the rough copper concentrate to obtain copper concentrate; Step S4 further includes: mixing the rough copper tailings with the second collector and performing a first scavenging and a second scavenging sequentially to obtain tailings and scavenging foam.

15. The flotation process for copper sulfide ore according to claim 14, characterized in that, The scavenging foam is reused in step S4 or step S2.

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