Chalcocite floating composite collector and application thereof

Abstract

The present application relates to the technical field of mineral flotation reagent, in particular to a chalcocite flotation composite collector and application thereof; the composite collector is compounded by a main collector and a synergistic collector according to a weight ratio of 3-5:1.0-1.5; the main collector obtained in the present application has relatively small stimulating odor, and can effectively improve the collecting performance of the collector, which is beneficial to the efficiency of chalcocite flotation; in addition, the synergistic collector is prepared by chemical reaction between diamine compound, phosphorous acid and formic aldehyde, etc., the synergistic collector and the main collector can further improve the copper recovery rate of chalcocite flotation by mutual synergistic cooperation; and the composite collector provided in the present application has the advantage of good selectivity, which can not only obtain copper concentrate with higher grade in the chalcocite flotation process, but also greatly reduce the pH value of tailing backwater, meet the alkaline standard requirement of direct backwater discharge, and be beneficial to the sustainable development of environment.

Description

Technical Field

[0001] This invention relates to the field of copper mineral flotation reagents, specifically to a composite collector for chalcocite flotation and its application. Background Technology

[0002] Chalcocite has the chemical composition Cu₂S and is a sulfide mineral belonging to the orthorhombic crystal system. A high-temperature polymorph of Cu₂S in the hexagonal crystal system, called hexagonal chalcocite, has also been found in nature. Chalcocite has the highest copper content among all copper sulfides, reaching 79.86%. It is an important mineral raw material for copper refining. Chalcocite is dark lead-gray in color, turning black on weathered surfaces, and has a metallic luster. Its Mohs hardness is 2.5–3. It often occurs as dense massive deposits in some copper ore deposits. It also frequently occurs as soot, formed by the replacement of chalcopyrite, bornite, and other sulfides by copper sulfate solution infiltrating from the oxidation zone of copper sulfide deposits. Chalcocite readily weathers at the surface into cuprite, malachite, or azurite.

[0003] Chalcocite is mostly a secondary mineral formed by the oxidation and decomposition of primary sulfides followed by reduction. It has a high copper content and is the most important copper smelting ore, with large quantities found in mines such as the Dongchuan Copper Mine in Yunnan, China. Its most common associated mineral is pyrite. In production applications, a large amount of lime is added to create a highly alkaline environment to inhibit the hydrophobic flotation of pyrite, and a strong collector is used for chalcocite flotation. This method is simple to apply and widely applicable; however, due to the large amount of lime added, long-term use can increase the risk of calcium buildup in the pipelines. Furthermore, the highly alkaline flotation environment can inhibit the recovery of associated gold minerals, significantly reducing the economic benefits for enterprises. In addition, when the pH value of the total tailings return water exceeds 9.0, it not only has a certain impact on environmental sustainability, but more seriously, for concentrators operating abroad, it may violate relevant environmental laws and regulations, leading to production shutdowns and irreparable losses for the enterprise.

[0004] Currently, in practical production applications, to avoid adding lime during roughing flotation, copper minerals are often floated in a weakly alkaline environment. However, a high-alkaline environment is created during copper-sulfur separation to suppress pyrite. Although the final tailings reclaimed water is significantly reduced, the pH value of the reclaimed water from the separated tailings is still too high, resulting in the total tailings reclaimed water exceeding the pH discharge limit of 9.0. Therefore, this invention provides a composite collector for chalcocite flotation and its application to solve these technical problems. Summary of the Invention

[0005] The purpose of this invention is to provide a composite collector for chalcocite flotation and its application. In this invention, the synergistic collector and the main collector work together to further improve the flotation performance of chalcocite under low-alkali conditions. Moreover, the composite collector provided in this application has the advantage of good selectivity, which can obtain copper concentrate with higher copper grade in the chalcocite flotation process.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A composite collector for chalcocite flotation, wherein the composite collector is composed of a main collector and a synergistic collector in a weight ratio of 3-5:1.0-1.5.

[0008] Furthermore, the preparation method of the main collector includes the following steps: Equimolar amounts of the reaction intermediate and chlorobenzyl methane are transferred into a reaction apparatus, mixed and stirred until homogeneous, and the temperature of the resulting mixture is raised to 75–80°C and maintained at this temperature for 2–5 hours; after the reaction is complete, aminoethane of equal mass to chlorobenzyl methane is added, and the reaction is maintained at 70–75°C for 2–3 hours; after the reaction is complete, a reaction promoter and an oxidant are added to the resulting product, and the reaction is maintained at 25–35°C for 2–3 hours; after the reaction is complete, the resulting product is the main collector finished product.

[0009] Furthermore, the reaction promoter is selected from either tetrabutylammonium bromide or tetrabutylammonium iodide, and the amount of the reaction promoter is 1.8 to 3.5% of the molar amount of chlorobenzylmethane.

[0010] Furthermore, the oxidant is selected as a 5-8 wt% aqueous solution of hydrogen peroxide, and the molar ratio of hydrogen peroxide to chlorobenzylmethane is 0.8-1.2:1.

[0011] Furthermore, the preparation method of the reaction intermediate includes the following steps: A compound solvent is added to a reaction apparatus, and 25-35% by volume of 4-methyl-2-pentanol and 32-38% by volume of carbon disulfide are added. After mixing and stirring evenly, the temperature of the resulting mixture is naturally cooled to 10-15°C. Then, an alkaline reagent with a molar amount 1.02-1.08 times that of 4-methyl-2-pentanol is added to the resulting mixture, and the mixture is kept warm and stirred for 2-3 hours. After the reaction is complete, 1.2-2.5% by mass of 3,7-dimethyl-6-octenal and 1.8-3.0% by mass of 2-methoxy-4-(2-propenyl)phenol are added to the resulting product component. After mixing and stirring evenly, the mixture is distilled under reduced pressure at 60-70°C for 3-5 hours to remove the solvent and water from the reaction product. After the solvent and water are allowed to settle and separate into layers, the solvent is recovered, and the remaining solid material is the final reaction intermediate product.

[0012] Furthermore, the compound solvent is prepared by ultrasonically mixing dichloromethane and carbon disulfide in a molar ratio of 1:0.8 to 1.2.

[0013] Furthermore, the alkaline reagent is selected from either potassium hydroxide or sodium hydroxide.

[0014] Furthermore, the preparation method of the synergistic collector includes the following steps: transferring a diamine compound and phosphorous acid together into a reaction apparatus at a molar ratio of 1:3 to 5, and then adding formic acid, with a molar amount of 0.8 to 1.2 times that of phosphorous acid, dropwise into the reaction apparatus at a temperature of 25 to 35°C; after the addition is complete, raising the temperature of the resulting mixed phase to 105 to 115°C and maintaining the reaction at this temperature for 2 to 4 hours; after the reaction is complete, allowing the product components to cool naturally to room temperature, and the final product is the synergistic collector; wherein, the dropping rate of formic acid is 70 to 90 drops / min.

[0015] Furthermore, the diamine compound is selected from any one of butanediamine, heptadecanediamine, and octanediamine.

[0016] An application of a composite collector for chalcocite flotation, wherein the composite collector is used in the flotation operation of chalcocite, and during the flotation process, the amount of the composite collector relative to chalcocite is 15-90 g / t, and the pH value of the pulp is 6-9.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] 1. In this invention, a reaction intermediate product is prepared by chemically reacting a compound solvent, 4-methyl-2-pentanol, 3,7-dimethyl-6-octenal, and 2-methoxy-4-(2-propenyl)phenol, etc., with the help of a reaction promoter. Then, using the reaction intermediate, chlorobenzylmethane, aminoethane, etc., as raw materials, the reaction intermediate reacts with chlorobenzylmethane and other components to form a bond, ultimately preparing the main collector. The resulting main collector not only has a relatively low irritating odor but also effectively improves the collecting performance of the collector, which is beneficial to the efficiency of mineral flotation.

[0019] 2. In this invention, a synergistic collector is prepared by chemical reaction between diamine compounds, phosphorous acid, and formic acid, etc. The resulting synergistic collector works synergistically with the main collector to further improve the efficiency and quality of mineral flotation. Moreover, the composite collector also has the advantage of good selectivity, resulting in copper concentrate with higher grade and recovery rate during mineral flotation.

[0020] 3. The chalcocite composite flotation collector proposed in this invention can replace some existing collectors in a low-alkali environment, selectively improve the copper grade of flotation froth, reduce the incorporation of associated pyrite, and achieve a high copper grade copper concentrate with the addition of a small amount of lime. It can also significantly reduce the pH value of tailings reclaimed water, meet the alkaline standard requirements for direct discharge of reclaimed water, and is conducive to environmental sustainability. Attached Figure Description

[0021] Figure 1 The flowcharts for Examples 1-3 and Comparative Examples 1-2 of the present invention are shown, which are the process flow diagrams for one roughing and two finishing processes under room temperature conditions.

[0022] Figure 2 This is a process flow diagram for application example 1 of the present invention. Detailed Implementation

[0023] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0024] Example 1

[0025] A composite collector for chalcocite flotation, wherein the composite collector is composed of a main collector and a synergistic collector in a weight ratio of 3:1.

[0026] The preparation method of the main collector includes the following steps: Equimolar amounts of the reaction intermediate and chlorobenzyl methane are transferred into a reaction apparatus, mixed and stirred until homogeneous, and the temperature of the resulting mixture is raised to 75°C and maintained at this temperature for 2 hours; after the reaction is complete, aminoethane of equal mass to chlorobenzyl methane is added, and the reaction is maintained at 70°C for 2 hours; after the reaction is complete, a reaction promoter and an oxidant are added to the resulting product, and the reaction is maintained at 25°C for 2 hours; after the reaction is complete, the resulting product is the main collector finished product.

[0027] The reaction promoter is tetrabutylammonium bromide, and the amount of the reaction promoter is 1.8% of the molar amount of chlorobenzylmethane; the oxidant is a 5 wt% aqueous solution of hydrogen peroxide, and the molar ratio of hydrogen peroxide to chlorobenzylmethane is 0.8:1.

[0028] The preparation method of the reaction intermediate includes the following steps: A compound solvent is added to a reaction apparatus, and 25% by volume of 4-methyl-2-pentanol and 32% by volume of carbon disulfide are added. After mixing and stirring evenly, the temperature of the resulting mixture is naturally cooled to 10°C. Then, potassium hydroxide with a molar amount 1.02 times that of 4-methyl-2-pentanol is added to the resulting mixture, and the mixture is kept warm and stirred for 2 hours. After the reaction is complete, 1.2% by mass of 3,7-dimethyl-6-octenal and 1.8% by mass of 2-methoxy-4-(2-propenyl)phenol are added to the resulting product component. After mixing and stirring evenly, the mixture is distilled under reduced pressure at 60°C for 3 hours to remove the solvent and water from the reaction product. After the solvent and water are allowed to settle and separate into layers, the solvent is recovered, and the remaining solid material is the final reaction intermediate product. The compound solvent is prepared by ultrasonically mixing dichloromethane and carbon disulfide at a molar ratio of 1:0.8.

[0029] The preparation method of the synergistic collector includes the following steps: Butanediamine and phosphorous acid are transferred together into the reaction device at a molar ratio of 1:3, and then formic acid, with a molar amount of 0.8 times that of phosphorous acid, is added dropwise to the reaction device at a temperature of 25°C; after the addition is completed, the temperature of the resulting mixed phase is raised to 105°C and the reaction is maintained at this temperature for 2 hours; after the reaction is completed, the product components are naturally cooled to room temperature, and the final product is the synergistic collector; wherein, the dropping rate of formic acid is 70 drops / min.

[0030] An application of a composite collector for chalcocite flotation is disclosed. The composite collector is used in the flotation operation of chalcocite, and the amount of composite collector relative to chalcocite is 15 g / t, and the pH value of the pulp is 6.

[0031] Example 2

[0032] A composite collector for chalcocite flotation, wherein the composite collector is composed of a main collector and a synergistic collector in a weight ratio of 4:1.2.

[0033] The preparation method of the main collector includes the following steps: Equimolar amounts of the reaction intermediate and chlorobenzyl methane are transferred into a reaction apparatus, mixed and stirred until homogeneous, and the temperature of the resulting mixture is raised to 80°C and maintained at this temperature for 3 hours; after the reaction is complete, aminoethane of equal mass to chlorobenzyl methane is added, and the mixture is then maintained at 70°C for 2.5 hours; after the reaction is complete, a reaction promoter and an oxidant are added to the resulting product, and the mixture is then maintained at 30°C for 2.5 hours; after the reaction is complete, the resulting product is the main collector.

[0034] The reaction promoter is tetrabutylammonium iodide, and the amount of the reaction promoter is 2.8% of the molar amount of chlorobenzylmethane; the oxidant is a 6 wt% aqueous solution of hydrogen peroxide, and the molar ratio of hydrogen peroxide to chlorobenzylmethane is 1:1.

[0035] The preparation method of the reaction intermediate includes the following steps: A compound solvent is added to a reaction apparatus, and 30% by volume of 4-methyl-2-pentanol and 35% by volume of carbon disulfide are added. After mixing and stirring evenly, the temperature of the resulting mixture is naturally cooled to 15°C. Then, sodium hydroxide with a molar amount 1.05 times that of 4-methyl-2-pentanol is added to the resulting mixture, and the mixture is kept warm and stirred for 2.5 hours. After the reaction is complete, 2.0% by mass of 3,7-dimethyl-6-octenal and 2.5% by mass of 2-methoxy-4-(2-propenyl)phenol are added to the resulting product component. After mixing and stirring evenly, the mixture is distilled under reduced pressure at 65°C for 4 hours to remove the solvent and water from the reaction product. After the solvent and water are allowed to settle and separate into layers, the solvent is recovered, and the remaining solid material is the final reaction intermediate product. The compound solvent is prepared by ultrasonically mixing dichloromethane and carbon disulfide in a 1:1 molar ratio.

[0036] The preparation method of the synergistic collector includes the following steps: heptanediamine and phosphorous acid are transferred together into the reaction device at a molar ratio of 1:4, and then an equimolar amount of formic acid is added dropwise to the reaction device at a temperature of 30°C; after the addition is completed, the temperature of the resulting mixed phase is raised to 110°C and the reaction is maintained at this temperature for 3 hours; after the reaction is completed, the product components are naturally cooled to room temperature, and the final product is the synergistic collector; wherein, the dropping rate of formic acid is 80 drops / min.

[0037] An application of a composite collector for chalcocite flotation is disclosed. The composite collector is used in the flotation operation of chalcocite, and the amount of composite collector relative to chalcocite during the flotation process is 60 g / t, and the pH value of the pulp is 7.

[0038] Example 3

[0039] A composite collector for chalcocite flotation, wherein the composite collector is composed of a main collector and a synergistic collector in a weight ratio of 5:1.5.

[0040] The preparation method of the main collector includes the following steps: Equimolar amounts of the reaction intermediate and chlorobenzyl methane are transferred into a reaction apparatus, mixed and stirred until homogeneous, and the temperature of the resulting mixture is raised to 80°C and maintained at this temperature for 5 hours; after the reaction is complete, aminoethane of equal mass to chlorobenzyl methane is added, and the mixture is then maintained at 75°C for 3 hours; after the reaction is complete, a reaction promoter and an oxidant are added to the resulting product, and the mixture is then maintained at 35°C for 3 hours; after the reaction is complete, the resulting product is the main collector.

[0041] The reaction promoter is tetrabutylammonium bromide, and the amount of the reaction promoter is 3.5% of the molar amount of chlorobenzylmethane; the oxidant is an 8 wt% aqueous solution of hydrogen peroxide, and the molar ratio of hydrogen peroxide to chlorobenzylmethane is 1.2:1.

[0042] The preparation method of the reaction intermediate includes the following steps: A compound solvent is added to a reaction apparatus, and 35% by volume of 4-methyl-2-pentanol and 38% by volume of carbon disulfide are added. After mixing and stirring evenly, the temperature of the resulting mixture is naturally cooled to 15°C. Then, potassium hydroxide with a molar amount 1.08 times that of 4-methyl-2-pentanol is added to the resulting mixture, and the mixture is kept warm and stirred for 3 hours. After the reaction is complete, 2.5% by mass of 3,7-dimethyl-6-octenal and 3.0% by mass of 2-methoxy-4-(2-propenyl)phenol are added to the resulting product component. After mixing and stirring evenly, the mixture is distilled under reduced pressure at 70°C for 5 hours to remove the solvent and water from the reaction product. After the solvent and water are allowed to settle and separate into layers, the solvent is recovered, and the remaining solid material is the final reaction intermediate product. The compound solvent is prepared by ultrasonically mixing dichloromethane and carbon disulfide at a molar ratio of 1:1.2.

[0043] The preparation method of the synergistic collector includes the following steps: octanediamine and phosphorous acid are transferred together into a reaction apparatus at a molar ratio of 1:5, and then formic acid, with a molar amount of 1.2 times that of phosphorous acid, is added dropwise to the reaction apparatus at a temperature of 35°C; after the addition is completed, the temperature of the resulting mixed phase is raised to 115°C and the reaction is maintained at this temperature for 4 hours; after the reaction is completed, the product components are naturally cooled to room temperature, and the final product is the synergistic collector; wherein, the dropping rate of formic acid is 90 drops / min.

[0044] An application of a composite collector for chalcocite flotation is disclosed. The composite collector is used in the flotation operation of chalcocite, and the amount of composite collector relative to chalcocite during the flotation process is 90 g / t, and the pH value of the pulp is 9.

[0045] The difference between Comparative Example 1 and Example 1 is that an equal amount of the main collector is used instead of the synergistic collector in this example.

[0046] Comparative Example 2 differs from Example 1 in that an equal amount of synergistic collector is used instead of the main collector in this example.

[0047] Performance testing: Copper ore flotation was carried out using the chalcocite flotation composite collectors provided in Examples 1-3 and Comparative Examples 1-2 (after one roughing and two cleaning processes at room temperature), and the obtained data are recorded in Table 1.

[0048] Table 1: Comparison Results of Performance Tests of Composite Collectors in Chalcocite Flotation

[0049]

[0050]

[0051] By comparing and analyzing the relevant data in the table, it can be seen that the synergistic collector and the main collector in this invention work together to further improve the copper recovery rate in chalcocite flotation. Furthermore, the composite collector also has the advantage of good selectivity, resulting in copper concentrates with higher grades and recovery rates during mineral flotation. Therefore, this indicates that the composite collector for chalcocite flotation provided by this invention has a broader market prospect and is more suitable for widespread application.

[0052] Application Example 1: The chalcocite flotation composite collector from Example 1 was applied to a copper sulfide mine in Ecuador, and the results were obtained using the accompanying drawings. Figure 2 The provided process flow processes copper ore with a copper grade of approximately 0.512% and a sulfur grade of approximately 1.39%. The main copper sulfide mineral in the raw ore is chalcocite, which is associated with pyrite. The commonly used production process in this field is copper-sulfur flotation followed by roughing and regrinding of the concentrate for separation, typically using butyl xanthate as the collector. No lime is added during copper-sulfur flotation. For roughing, a composite collector at 30 g / t is added. For scavenging, a mixture of butyl xanthate and the composite collector is added at a dosage of 10 g / t (mass ratio 3:1). For roughing during regrinding and regrinding of the concentrate, 0.8 kg / t of lime is added. The experimental results are shown in Table 2.

[0053] Table 2: Flotation Test Parameters of Application Example 1

[0054]

[0055] The experimental results show that: in Example 1, the amount of lime added in the roughing and separation operation of the rough concentrate regrinding is 0.8 kg / t, which can obtain a copper concentrate with a copper grade of 26.34%. The pH value of the slurry of tailings 1 is 8.5, the pH value of the slurry of tailings 2 is about 11.0, and the pH value of the slurry of ∑ tailings is 8.8, which can be stabilized below 9.0.

[0056] Application Example 2: The difference from Application Example 1 is that in Application Example 2, an equal amount of butyl xanthate is used instead of the chalcocite flotation composite collector, while the amount of lime added remains unchanged. The experimental results are shown in Table 3.

[0057] Table 3: Flotation Test Parameters of Application Example 2

[0058]

[0059] The experimental results show that when an equal amount of butyl xanthate is used to replace the composite collector for chalcocite flotation in mixed flotation scavenging operations, the selectivity of the collector deteriorates, and a large amount of pyrite is mixed into the mixed copper concentrate. When the amount of lime added after regrinding is still 0.8 kg / t, the copper grade of the copper concentrate drops significantly to 23.15%, and the flotation indicators deteriorate.

[0060] Application Example 3: The difference from Application Example 1 is that in Application Example 3, an equal amount of butyl xanthate is used to replace the composite collector in the chalcocite flotation, and the lime addition for the roughing and separation operation of the mixed rough concentrate is increased to 1.5 kg / t. This reagent system is the actual production reagent system used on site. The test results are shown in Table 4:

[0061] Table 4: Flotation Test Parameters of Application Example 3

[0062]

[0063] The experimental results show that in Application Example 3, by replacing the chalcopyrite composite collector with an equal amount of butyl xanthate in the mixed flotation scavenging operation, and adding 1.5 kg / t of lime in the roughing separation of the rough concentrate after regrinding, a copper concentrate with a copper grade of 26.25% can be obtained. The pH value of the slurry in tailings 1 remains unchanged, while the pH value of the slurry in tailings 2 increases to 12.1, resulting in the pH value of the ∑ tailings slurry increasing to about 10.3. Although a copper concentrate with better separation indicators was obtained, the high pH value of the tailings return water will not only have a certain impact on environmental sustainability, but more seriously, it will violate relevant foreign environmental laws and regulations, leading to production stoppages and causing irreparable losses to the enterprise. Furthermore, the increased amount of lime added will also inhibit the floatability of associated gold minerals and increase the risk of pipeline calcium buildup.

[0064] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0065] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A composite collector for chalcocite flotation, characterized in that the composite collector comprises a main collector and a synergistic collector in a ratio of 3-5: It is a compound made up of ingredients in a weight ratio of 1.0 to 1.5; The preparation method of the main collector includes the following steps: An equimolar amount of the reaction intermediate and chlorobenzane were transferred into the reaction apparatus, mixed and stirred until homogeneous, and the temperature of the resulting mixture was raised to 75–80°C and maintained at this temperature for 2–5 hours. After the reaction was complete, an equimolar amount of aminoethane was added to the mixture, and the reaction was maintained at 70–75°C for 2–3 hours. After the reaction was complete, a reaction promoter and an oxidant were added to the resulting product, and the reaction was maintained at 25–35°C for 2–3 hours. After the reaction was complete, the resulting product was the main collector. The preparation method of the reaction intermediate includes the following steps: A compound solvent is added to a reaction apparatus, and 25-35% by volume of 4-methyl-2-pentanol and 32-38% by volume of carbon disulfide are added. After mixing and stirring evenly, the temperature of the resulting mixture is naturally cooled to 10-15°C. Then, an alkaline reagent with a molar amount 1.02-1.08 times that of 4-methyl-2-pentanol is added to the resulting mixture, and the mixture is kept warm and stirred for 2-3 hours. After the reaction is complete, 1.2-2.5% by mass of 3,7-dimethyl-6-octenal and 1.8-3.0% by mass of 2-methoxy-4-(2-propenyl)phenol are added to the resulting product. After mixing and stirring evenly, the mixture is distilled under reduced pressure at 60-70°C for 3-5 hours to remove the solvent and water from the reaction product. After the solvent and water are allowed to settle and separate into layers, the solvent is recovered, and the remaining solid material is the final reaction intermediate product.

2. The composite collector for chalcocite flotation according to claim 1, characterized in that: The reaction promoter is selected from either tetrabutylammonium bromide or tetrabutylammonium iodide, and the amount of reaction promoter used is 1.8 to 3.5% of the molar amount of chlorobenzylmethane.

3. The composite collector for chalcocite flotation according to claim 1, characterized in that: The oxidant is selected as a 5-8 wt% aqueous solution of hydrogen peroxide, and the molar ratio of hydrogen peroxide to chlorobenzyl methane is 0.8-1.2:

1.

4. The composite collector for chalcocite flotation according to claim 1, characterized in that: The compound solvent is prepared by ultrasonically mixing dichloromethane and carbon disulfide at a molar ratio of 1:0.8 to 1.

2.

5. The composite collector for chalcocite flotation according to claim 1, characterized in that: The alkaline reagent may be selected from either potassium hydroxide or sodium hydroxide.

6. The composite collector for chalcocite flotation according to claim 1, characterized in that: The preparation method of the synergistic collector includes the following steps: a diamine compound and phosphorous acid are transferred together into a reaction apparatus at a molar ratio of 1:3 to 5; then, formic acid, with a molar amount of 0.8 to 1.2 times that of phosphorous acid, is added dropwise to the reaction apparatus at a temperature of 25 to 35°C; after the addition is complete, the temperature of the resulting mixed phase is raised to 105 to 115°C and the reaction is maintained at this temperature for 2 to 4 hours; after the reaction is complete, the product components are naturally cooled to room temperature, and the final product is the synergistic collector; wherein, the dropping rate of formic acid is 70 to 90 drops / min.

7. The composite collector for chalcocite flotation according to claim 6, characterized in that: The diamine compound is selected from any one of butanediamine, heptamethamine, and octanediamine.

8. The application of the composite collector for chalcocite flotation according to any one of claims 1 to 7, characterized in that: The composite collector is applied to the flotation of chalcocite, and during the flotation process, the amount of the composite collector relative to chalcocite is 15-90 g / t, and the pH value of the pulp is 6-9.

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