A copper oxide ore composite surface activator and method of use thereof

Abstract

This invention discloses a composite surface activator for copper oxide ore and its application method. The composite activator comprises: copper salt, composite ammonium salt, and ethylenediamine phosphate. The copper salt is selected from copper sulfate and / or copper chloride, and the amount of copper salt added is 200-400 g / t based on the ore mass. The amount of ethylenediamine phosphate added is 300-500 g / t. The composite ammonium salt is composed of ammonium alginate, ammonium phosphate, and ammonium chloride. Based on the mass fraction of 100% of the composite ammonium salt, ammonium alginate accounts for 15-25%, ammonium phosphate accounts for 25-35%, and ammonium chloride accounts for 45-55%, and the amount of composite ammonium salt added is 800-1400 g / t. The copper salt, ethylenediamine phosphate, and composite ammonium salt work synergistically on the surface of copper oxide ore. By utilizing the synergistic effect of copper salt, ethylenediamine phosphate, and composite ammonium salt, the reactivity of the mineral surface with subsequent sulfiding agents is improved, promoting rapid and efficient adsorption of sulfur ions. This can solve the technical problems of poor sulfidation effect and unsatisfactory flotation indicators in copper oxide ore.

Description

Technical Field

[0001] This invention relates to the field of efficient flotation of copper oxide ores, and specifically to a composite surface activator for copper oxide ores and its application method. Background Technology

[0002] With the continued growth in global demand for copper resources, high-grade, easily beneficiated copper sulfide ores are becoming increasingly scarce. As an important supplement to copper resources, copper oxide ores are receiving more and more attention for their development and utilization. However, due to their inherent characteristics, such as high binding rate, fine particle size, severe mud formation, and complex mineral types, copper oxide ores are difficult to recover through flotation, resulting in a low comprehensive utilization rate of resources.

[0003] Currently, the main flotation methods for copper oxide ores are direct flotation and sulfide flotation. Direct flotation suffers from poor selective separation of copper oxide minerals from gangue minerals when processing copper oxide ores with complex mineral compositions, making it difficult to obtain ideal flotation parameters. While sulfide flotation pre-modifies the mineral surface by adding a sulfiding agent before adding the collector, resulting in the formation of highly reactive copper sulfide components or even a copper sulfide film on the surface of hydrophilic copper oxide minerals, followed by recovery using a flotation process similar to that for copper sulfide ores, traditional sulfide flotation still has many problems, such as poor sulfidation effect, difficulty in stable collector adsorption, and unsatisfactory flotation parameters. Especially for argillaceous copper oxide ores, the copper minerals in the ore are finely disseminated, usually requiring fine grinding to meet flotation requirements. However, the hardness differences among the minerals during fine grinding lead to uneven particle size distribution in the grinding product, generating a large amount of secondary slime. This slime contains not only gangue minerals but also copper oxide minerals, which cannot be directly removed, severely interfering with the flotation recovery of copper oxide minerals, reducing flotation efficiency and concentrate quality, and increasing flotation reagent consumption. Therefore, developing a flotation method that can effectively improve the flotation recovery rate of copper oxide ores, reduce reagent consumption, and adapt to the complex characteristics of copper oxide ores is of significant practical importance. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a composite surface activator for copper oxide ore and its application method. The composite activator comprises: a copper salt, a composite ammonium salt, and ethylenediamine phosphate. The copper salt is selected from copper sulfate and / or copper chloride, and the amount of copper salt added is 200-400 g / t; the amount of ethylenediamine phosphate added is 300-500 g / t; the composite ammonium salt is composed of ammonium alginate, ammonium phosphate, and ammonium chloride, with ammonium alginate accounting for 15% of the total mass of the composite ammonium salt (100% by mass). The mixture comprises 25% copper salt, 25-35% ammonium phosphate, and 45-55% ammonium chloride, with a total addition of 800-1400 g / t. Copper salt, ethylenediamine phosphate, and the complex ammonium salt work synergistically on the surface of copper oxide minerals. Utilizing the synergistic effect of these salts, the reactivity of the mineral surface with subsequent sulfiding agents is enhanced, promoting rapid and efficient adsorption of sulfur ions. This addresses the problems of low flotation recovery rates, high reagent consumption, and difficulty in handling complex copper oxide ores in existing technologies. By employing a specific process flow and reagent combination, efficient flotation recovery of copper oxide ores is achieved, improving the comprehensive utilization rate of resources.

[0005] To achieve the above technical effects, the following technical solution is adopted: A composite surfactant for copper oxide ore, comprising: Copper salts, complex ammonium salts, and ethylenediamine phosphate; Copper salts are selected from copper sulfate and / or copper chloride; The complex ammonium salt is composed of ammonium alginate, ammonium phosphate and ammonium chloride.

[0006] Furthermore, the amount of copper salt added is 200-400 g / t per ton of copper oxide ore.

[0007] Furthermore, the amount of ethylenediamine phosphate added is 300-500 g / t per ton of copper oxide ore.

[0008] Furthermore, in the composite ammonium salt, based on a mass fraction of 100%, ammonium alginate accounts for 15-25%, ammonium phosphate accounts for 25-35%, and ammonium chloride accounts for 45-55%.

[0009] Furthermore, the amount of the composite ammonium salt added is 800-1400 g / t per ton of copper oxide ore.

[0010] A method for using a copper oxide ore composite surface activator includes: Step S1: Ore Pretreatment The crushed copper oxide ore is added to a ball mill, along with a pH adjuster, and the grinding conditions are controlled to achieve a degree of liberation of copper oxide minerals of more than 85%. After grinding, the pulp concentration is adjusted to obtain the pulp. Step S2: Co-activation of mineral surfaces Copper salt, compound ammonium salt, and ethylenediamine phosphate are added to the slurry obtained in step S1 to activate the surface of copper oxide minerals, resulting in activated slurry. The copper salt is selected from copper sulfate and / or copper chloride. The amount of copper salt added is 200-400 g / t per ton of copper oxide ore, and the amount of ethylenediamine phosphate added is 300-500 g / t. The compound ammonium salt is composed of ammonium alginate, ammonium phosphate, and ammonium chloride. Based on the mass fraction of the compound ammonium salt as 100%, ammonium alginate accounts for 15-25%, ammonium phosphate accounts for 25-35%, and ammonium chloride accounts for 45-55%. The amount of compound ammonium salt added is 800-1400 g / t.

[0011] Step S3: Full-grain-scale deep vulcanization The sulfiding agent is added to the activated slurry obtained in step S2 to perform full-scale deep sulfidation of copper oxide minerals, resulting in a sulfided slurry. Step S4: Grain Classification After the sulfide slurry obtained in step S3 is slurried, it is classified into coarse and fine ore particles to separate the slurry into coarse slurry and fine slurry; wherein the particle size of the coarse slurry is not less than 0.038 mm, and the particle size of the fine slurry is less than 0.038 mm. Step S5: Flotation of coarse-grained slurry In step S4, an inhibitor is added to the coarse-grained slurry to selectively inhibit gangue minerals. Then, a collector and a frother are added sequentially. After slurry conditioning, flotation is performed to obtain coarse-grained copper concentrate and coarse-grained flotation tailings. Based on each ton of copper oxide ore, isoamyl xanthate is selected as the collector, with an addition amount of 400-800 g / t. No. 2 oil is selected as the frother, with an addition amount of 40-80 g / t. Step S6: Flotation of fine-grained slurry Inhibitors, collectors, and frothers are added sequentially to the fine-grained slurry. After slurry conditioning, flotation is performed to obtain fine-grained copper concentrate and fine-grained flotation tailings. The collector is isoamyl xanthate, with an addition amount of 600-900 g / t, and the frother is No. 2 oil, with an addition amount of 50-100 g / t. Step S7: Concentrate Consolidation and Tailings Treatment The coarse-grained copper concentrate obtained in step S5 and the fine-grained copper concentrate obtained in step S6 are combined to obtain the final flotation copper concentrate; the coarse-grained flotation tailings obtained in step S5 and the fine-grained flotation tailings obtained in step S6 are combined and used as flotation tailings for further processing.

[0012] Furthermore, in step S1, the particle size of the crushed copper oxide ore is less than 2 mm; the pH adjuster is calcium oxide; the amount of calcium oxide added is 1500-2000 g / t per ton of copper oxide ore; and the slurry mass percentage concentration is 26-33%.

[0013] Furthermore, in step S3, sodium sulfide and / or sodium hydrosulfide are selected as the sulfiding agent, and the amount of sulfiding agent added is 800-1200g / t per ton of copper oxide ore.

[0014] Furthermore, in step S5, water glass is added as an inhibitor at a rate of 100-300 g / t per ton of copper oxide ore. Furthermore, in step S6, water glass is added as an inhibitor at a rate of 200-500 g / t per ton of copper oxide ore.

[0015] The beneficial effects of this invention are as follows: 1. Improved Flotation Recovery: Through the synergistic activation of copper salt, complex ammonium salt, and ethylenediamine phosphate, the reactivity of the copper oxide mineral surface is significantly enhanced, promoting the adsorption of the sulfiding agent and the sulfidation reaction on the mineral surface. This results in the formation of a stable and uniformly distributed copper sulfide film, greatly improving the floatability of copper oxide minerals and thus effectively increasing the flotation recovery rate. Compared with traditional flotation methods, the flotation recovery rate of this invention can be increased by 5-10%.

[0016] 2. Reduced Reagent Consumption: Targeted dosing strategies are employed for slurries of different particle sizes, precisely controlling reagent usage and reducing unnecessary waste. In the flotation of coarse-grained slurries, the rational use of depressants reduces the ineffective adsorption of gangue minerals by the collector, thus lowering the collector dosage. In the flotation of fine-grained slurries, the combined use of slime modifiers and composite collectors improves the flotation efficiency of fine-grained copper oxide minerals while avoiding excessive reagent use due to slime interference.

[0017] 3. Adaptability to Complex Oxide Copper Ores: Especially for clayey oxide copper ores, the system effectively solves the problem of secondary slime interference with flotation during fine grinding by classifying coarse and fine particles and employing targeted flotation strategies. Separate treatment of coarse and fine particle slurries fully utilizes the flotation characteristics of different particle sizes of copper oxide minerals, improving adaptability to complex oxide copper ores and achieving deep sulfidation and efficient recovery across all particle sizes.

[0018] 4. Improve the comprehensive utilization rate of resources: The method of this invention can more effectively recover copper minerals from copper oxide ore, improve the grade and recovery rate of copper concentrate, reduce the loss of copper in tailings, thereby improving the comprehensive utilization rate of resources and having significant economic and environmental benefits. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0020] It should be noted that the following detailed descriptions are exemplary and intended to provide further illustration of the invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0021] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments of the present invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, and / or combinations thereof.

[0022] 1. Ore Pretreatment: The crushed copper oxide ore to -2mm is added to a ball mill, along with a pH adjuster, calcium oxide, at a rate of 1500-2000 g / t. During grinding, the grinding conditions are controlled to ensure that the liberation degree of the copper oxide minerals reaches over 85%, guaranteeing sufficient contact between the target mineral and the reagents in the subsequent flotation process. After grinding, the pulp concentration is adjusted to 26-33% by mass to provide a suitable environment for subsequent mineral surface activation and sulfidation reactions.

[0023] 2. Synergistic Activation of Mineral Surfaces: Copper salt, compound ammonium salt, and ethylenediamine phosphate are added to the adjusted slurry as activators to synergistically activate the surface of copper oxide minerals. The amount of copper salt added is 200-400 g / t per ton of copper oxide ore, using copper sulfate and / or copper chloride; the amount of ethylenediamine phosphate added is 300-500 g / t; the compound ammonium salt consists of ammonium alginate, ammonium phosphate, and ammonium chloride, with ammonium alginate accounting for 15-25%, ammonium phosphate for 25-35%, and ammonium chloride for 45-55% by mass, and the amount of compound ammonium salt added is 800-1400 g / t. The copper salt, ethylenediamine phosphate, and compound ammonium salt synergistically act on the surface of copper oxide minerals, improving the reactivity of the mineral surface with subsequent sulfiding agents and promoting rapid and efficient adsorption of sulfur ions.

[0024] 3. Full-scale deep sulfidation: A sulfiding agent is added to the synergistically activated slurry to perform full-scale deep sulfidation of copper oxide minerals, resulting in a sulfided slurry. Sodium sulfide and / or sodium hydrosulfide are selected as the sulfiding agent, with an addition amount of 800-1200 g / t of copper oxide ore. By optimizing the type and dosage of the sulfiding agent, a stable and uniformly distributed copper sulfide film is formed on the surface of the copper oxide minerals, significantly improving their floatability.

[0025] 4. Coarse and Fine Particle Size Classification: After conditioning, the sulfide slurry is classified into coarse and fine particle sizes, resulting in coarse and fine particle sizes. The coarse particle size is not less than 0.038 mm, while the fine particle size is less than 0.038 mm. This particle size classification allows for the application of different flotation strategies to the different particle sizes, improving the targeting and efficiency of the flotation process.

[0026] 5. Coarse-grained slurry flotation: Depressants are added to the coarse-grained slurry to selectively suppress gangue minerals. Then, collectors and frothers are added sequentially. After slurry conditioning, flotation is performed to obtain coarse-grained copper concentrate and coarse-grained flotation tailings. Based on per ton of copper oxide ore, water glass is used as a depressant at a dosage of 100-300 g / t; isoamyl xanthate is used as the collector at a dosage of 400-800 g / t; and No. 2 oil is used as the frother at a dosage of 40-80 g / t. The use of depressants effectively reduces the interference of gangue minerals on flotation, improving the flotation recovery rate and concentrate quality of coarse-grained copper oxide ore.

[0027] 6. Fine-grained slurry flotation: Depressant, collector, and frother are added sequentially to the fine-grained slurry. After slurry conditioning, flotation is performed to obtain fine-grained copper concentrate and fine-grained flotation tailings. Water glass is used as a depressant at a dosage of 200-500 g / t; isoamyl xanthate is used as the collector at a dosage of 600-900 g / t; and No. 2 oil is used as the frother at a dosage of 50-100 g / t. The depressant effectively improves the properties of slime in the fine-grained slurry, reducing its negative impact on flotation.

[0028] 7. Concentrate Consolidation and Tailings Treatment: The coarse-grained copper concentrate obtained in step 5 and the fine-grained copper concentrate obtained in step 6 are combined to obtain the final flotation copper concentrate. The coarse-grained flotation tailings obtained in step 5 and the fine-grained flotation tailings obtained in step 6 are combined and treated as flotation tailings for further processing.

[0029] Example 1: Ore preparation: Select raw ore of clayey copper oxide with a copper content of 1.0% by mass, crush it to 2mm, and then grind it in a ball mill. At the same time, add the pH adjuster calcium oxide at a rate of 1500g / t (the amount added per ton of ore, the same below) to adjust the slurry concentration to 28% by mass. After grinding, more than 85% of the copper oxide minerals are liberated.

[0030] Synergistic activation of mineral surfaces: Add 300g / t of copper sulfate (the amount added per ton of ore, the same below), 300g / t of ethylenediamine phosphate, and 1000g / t of compound ammonium salt to the above slurry. The compound ammonium salt contains 20% ammonium alginate, 30% ammonium phosphate, and 50% ammonium chloride. Stir for 4 minutes to allow the copper salt, ethylenediamine phosphate, and compound ammonium salt to fully act on the surface of copper oxide minerals and complete the synergistic activation process.

[0031] Full-size deep sulfidation: Add 1000g / t of sodium sulfide to the activated slurry, stir for 3 minutes, and carry out full-size deep sulfidation to obtain sulfided slurry.

[0032] Grain classification: The sulfide slurry is classified into coarse and fine particles by passing it through a hydrocyclone to obtain coarse slurry (particle size not less than 38μm) and fine slurry (particle size less than 38μm).

[0033] Coarse-grained slurry flotation: Add 200 g / t of water glass to the coarse-grained slurry and stir for 2 minutes. Then add 600 g / t of isoamyl xanthate and stir for 2 minutes. Finally, add 40 g / t of No. 2 oil and stir for 2 minutes before flotation to obtain coarse-grained copper concentrate and coarse-grained flotation tailings.

[0034] Fine-grained slurry flotation: Add 300 g / t of water glass to the fine-grained slurry and stir for 2 minutes. Then add 900 g / t of isoamyl xanthate and stir for 2 minutes. Finally, add 60 g / t of No. 2 oil and stir for 5 minutes before flotation to obtain fine-grained copper concentrate and fine-grained flotation tailings.

[0035] Concentrate Consolidation and Tailings Treatment: Coarse-grained and fine-grained copper concentrates are combined to obtain flotation copper concentrate with a copper grade of 20.5% and a recovery rate of 83.3%. Coarse-grained and fine-grained flotation tailings are combined and treated as flotation tailings.

[0036] Example 2 Ore preparation: Select raw ore of clayey copper oxide with a copper mass percentage of 1.2%, crush it to 2mm, grind it, and add calcium oxide as a pH adjuster at a rate of 2000g / t (the amount added per ton of ore, the same below) to adjust the slurry concentration to 30% by mass, so that 90% of the copper oxide minerals are liberated.

[0037] Co-activation of mineral surfaces: Add 350g / t of copper chloride, 400g / t of ethylenediamine phosphate, and 1200g / t of compound ammonium salt. The compound ammonium salt contains 18% ammonium alginate, 32% ammonium phosphate, and 50% ammonium chloride. Stir for 4 minutes to carry out synergistic activation.

[0038] Full-grain-scale deep vulcanization: Add 1100g / t of sodium hydrosulfide and stir for 3 minutes to vulcanize.

[0039] Grain classification: The sulfide slurry is classified into coarse and fine particles by passing it through a hydrocyclone to obtain coarse slurry (particle size not less than 38μm) and fine slurry (particle size less than 38μm).

[0040] Coarse-grained slurry flotation: Add 300g / t of water glass, 750g / t of isoamyl xanthate, and 50g / t of No. 2 oil for flotation.

[0041] Flotation of fine-grained slurry: Add 400g / t of water glass, 900g / t of isoamyl xanthate, and 70g / t of No. 2 oil for flotation.

[0042] Concentrate Consolidation and Tailings Treatment: The consolidated concentrates yielded flotation copper concentrate with a copper grade of 19.55% and a recovery rate of 85.5%. The consolidated tailings were then processed.

[0043] Comparative Example 1 (no activation performed) Traditional sulfide flotation was employed, without surface activation of the minerals; the sulfiding agent was directly added for sulfidation before flotation. The same argillaceous copper oxide ore as in Example 1 was selected, and after the same crushing, grinding, and pulp concentration adjustment, 1000 g / t of sodium sulfide was directly added for sulfidation. The same collector and frother were used in the subsequent flotation process. The final flotation copper concentrate had a copper grade of 17.8% and a recovery rate of 74.5%.

[0044] Comparative Example 2 (lacking copper chloride) Based on Example 2, the only difference is the synergistic activation of the mineral surface: 487.5 g / t of ethylenediamine phosphate and 1462.5 g / t of a complex ammonium salt were added, wherein the complex ammonium salt contained 18% ammonium alginate, 32% ammonium phosphate, and 50% ammonium chloride; the mixture was stirred for 4 minutes for synergistic activation. Other steps were consistent with Example 2.

[0045] Concentrate Consolidation and Tailings Treatment: The consolidated concentrates yielded flotation copper concentrate with a copper grade of 19.67% and a recovery rate of 78.20%. The consolidated tailings were then further processed.

[0046] Comparative Example 3 (lacking ethylenediamine phosphate) Based on Example 2, the only difference is the synergistic activation of the mineral surface: 440.3 g / t of copper chloride and 1509.7 g / t of a complex ammonium salt were added, wherein the complex ammonium salt contained 18% ammonium alginate, 32% ammonium phosphate, and 50% ammonium chloride; the mixture was stirred for 4 minutes for synergistic activation. Other steps were consistent with Example 2.

[0047] Concentrate Consolidation and Tailings Treatment: The consolidated concentrates yielded flotation copper concentrate with a copper grade of 17.46% and a recovery rate of 77.75%. The consolidated tailings were then processed further.

[0048] Comparative Example 4 (lacking ammonium alginate from the ammonium salt) Based on Example 2, the only difference is the synergistic activation of the mineral surface: 350 g / t of copper chloride, 400 g / t of ethylenediamine phosphate, and 1200 g / t of a complex ammonium salt were added. The complex ammonium salt did not contain ammonium alginate; ammonium phosphate accounted for 39%, and ammonium chloride accounted for 61%. The mixture was stirred for 4 minutes for synergistic activation. All other steps were consistent with Example 2.

[0049] Concentrate Consolidation and Tailings Treatment: The consolidated concentrates yielded flotation copper concentrate with a copper grade of 18.18% and a recovery rate of 79.47%. The consolidated tailings were then further processed.

[0050] Comparative Example 5 (lacking ammonium phosphate from the ammonium salt) Based on Example 2, the only difference is the synergistic activation of the mineral surface: 350 g / t of copper chloride, 400 g / t of ethylenediamine phosphate, and 1200 g / t of a complex ammonium salt were added. The complex ammonium salt did not contain ammonium phosphate, and the ammonium alginate accounted for 26.5% and ammonium chloride accounted for 73.5%. The mixture was stirred for 4 minutes for synergistic activation. All other steps were consistent with Example 2.

[0051] Concentrate Consolidation and Tailings Treatment: The consolidated concentrates yielded flotation copper concentrate with a copper grade of 17.63% and a recovery rate of 77.34%. The consolidated tailings were then processed further.

[0052] Comparative Example 6 (lacking ammonium chloride from the ammonium salt) Based on Example 2, the only difference is the synergistic activation of the mineral surface: 350 g / t of copper chloride, 400 g / t of ethylenediamine phosphate, and 1200 g / t of a complex ammonium salt were added. The complex ammonium salt did not contain ammonium chloride; ammonium alginate accounted for 36%, and ammonium phosphate accounted for 64%. The mixture was stirred for 4 minutes for synergistic activation. All other steps were consistent with Example 2.

[0053] Concentrate Consolidation and Tailings Treatment: The consolidated concentrates yielded flotation copper concentrate with a copper grade of 18.39% and a recovery rate of 79.15%. The consolidated tailings were then further processed.

[0054] Comparative Example 7 (lacking the entire complex ammonium salt) Based on Example 2, the only difference is the synergistic activation of the mineral surface: 910 g / t of copper chloride and 1040 g / t of ethylenediamine phosphate were added; the mixture was stirred for 4 minutes for synergistic activation. All other steps remained the same as in Example 2.

[0055] Concentrate Consolidation and Tailings Treatment: The consolidated concentrates yielded flotation copper concentrate with a copper grade of 16.52% and a recovery rate of 76.74%. The consolidated tailings were then further processed.

[0056] In summary, this invention discloses a composite surface activator for copper oxide ore and its application method. The composite activator comprises: copper salt, a composite ammonium salt, and ethylenediamine phosphate. The copper salt is selected from copper sulfate and / or copper chloride, with an addition amount of 200-400 g / t based on ore mass. The ethylenediamine phosphate addition amount is 300-500 g / t. The composite ammonium salt is composed of ammonium alginate, ammonium phosphate, and ammonium chloride. Based on a 100% mass fraction of the composite ammonium salt, ammonium alginate accounts for 15-25%, ammonium phosphate for 25-35%, and ammonium chloride for 45-55%, with an addition amount of 800-1400 g / t. The copper salt, ethylenediamine phosphate, and composite ammonium salt synergistically act on the surface of copper oxide minerals. Utilizing the synergistic effect of these three salts, the reactivity of the mineral surface with subsequent sulfiding agents is improved, promoting rapid and efficient adsorption of sulfur ions. This addresses the technical problems of poor sulfidation effect and unsatisfactory flotation indicators in copper oxide ore.

[0057] Therefore, those skilled in the art will recognize that although embodiments of the present invention have been shown and described in detail herein, many other variations or modifications conforming to the principles of the present invention can be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the invention. Therefore, the scope of the present invention should be understood and recognized as covering all such other variations or modifications.

Claims

1. A composite surface activator for copper oxide ore, characterized in that, The composite surface activator is: Copper salts, complex ammonium salts, and ethylenediamine phosphate; Copper salts are selected from copper sulfate and / or copper chloride; The complex ammonium salt is composed of ammonium alginate, ammonium phosphate and ammonium chloride.

2. The copper oxide ore composite surface activator as described in claim 1, characterized in that, The amount of copper salt added is 200-400 g / t per ton of copper oxide ore.

3. The composite surface activator for copper oxide ore as described in claim 1, characterized in that, The amount of ethylenediamine phosphate added is 300-500 g / t per ton of copper oxide ore.

4. The copper oxide ore composite surface activator as described in claim 1, characterized in that, In the aforementioned compound ammonium salt, based on a mass fraction of 100%, ammonium alginate accounts for 15-25%, ammonium phosphate accounts for 25-35%, and ammonium chloride accounts for 45-55%.

5. The copper oxide ore composite surface activator as described in claim 1, characterized in that, The amount of the composite ammonium salt added is 800-1400 g / t per ton of copper oxide ore.

6. A method for using a composite surface activator for copper oxide ore, characterized in that, The method includes: Step S1: Ore Pretreatment The crushed copper oxide ore is added to a ball mill, along with a pH adjuster, and the grinding conditions are controlled to achieve a degree of liberation of copper oxide minerals of more than 85%. After grinding, the pulp concentration is adjusted to obtain the pulp. Step S2: Co-activation of mineral surfaces Copper salt, compound ammonium salt, and ethylenediamine phosphate are added to the slurry obtained in step S1 to activate the surface of copper oxide minerals, resulting in activated slurry. The copper salt is selected from copper sulfate and / or copper chloride. The amount of copper salt added is 200-400 g / t per ton of copper oxide ore, and the amount of ethylenediamine phosphate added is 300-500 g / t. The compound ammonium salt is composed of ammonium alginate, ammonium phosphate, and ammonium chloride. Based on the mass fraction of the compound ammonium salt as 100%, ammonium alginate accounts for 15-25%, ammonium phosphate accounts for 25-35%, and ammonium chloride accounts for 45-55%. The amount of compound ammonium salt added is 800-1400 g / t. Step S3: Full-grain-scale deep vulcanization The sulfiding agent is added to the activated slurry obtained in step S2 to perform full-scale deep sulfidation of copper oxide minerals, resulting in a sulfided slurry. Step S4: Grain Classification After the sulfide slurry obtained in step S3 is slurried, it is classified into coarse and fine ore particles to separate the slurry into coarse slurry and fine slurry; wherein the particle size of the coarse slurry is not less than 0.038 mm, and the particle size of the fine slurry is less than 0.038 mm. Step S5: Flotation of coarse-grained slurry In step S4, an inhibitor is added to the coarse-grained slurry to selectively inhibit gangue minerals. Then, a collector and a frother are added sequentially. After slurry conditioning, flotation is performed to obtain coarse-grained copper concentrate and coarse-grained flotation tailings. Based on each ton of copper oxide ore, isoamyl xanthate is selected as the collector, with an addition amount of 400-800 g / t. No. 2 oil is selected as the frother, with an addition amount of 40-80 g / t. Step S6: Flotation of fine-grained slurry Inhibitors, collectors, and frothers are added sequentially to the fine-grained slurry. After slurry conditioning, flotation is performed to obtain fine-grained copper concentrate and fine-grained flotation tailings. The collector is isoamyl xanthate, with an addition amount of 600-900 g / t, and the frother is No. 2 oil, with an addition amount of 50-100 g / t. Step S7: Concentrate Consolidation and Tailings Treatment The coarse-grained copper concentrate obtained in step S5 and the fine-grained copper concentrate obtained in step S6 are combined to obtain the final flotation copper concentrate; the coarse-grained flotation tailings obtained in step S5 and the fine-grained flotation tailings obtained in step S6 are combined and used as flotation tailings for further processing.

7. The method of using the copper oxide ore composite surface activator as described in claim 6, characterized in that, In step S1, the particle size of the crushed copper oxide ore is less than 2 mm; the pH adjuster is calcium oxide; the amount of calcium oxide added is 1500-2000 g / t per ton of copper oxide ore; and the slurry mass percentage concentration is 26-33%.

8. The method of using the copper oxide ore composite surface activator as described in claim 6, characterized in that, In step S3, sodium sulfide and / or sodium hydrosulfide are selected as the sulfiding agent, and the amount of sulfiding agent added is 800-1200g / t per ton of copper oxide ore.

9. The method of using the copper oxide ore composite surface activator as described in claim 6, characterized in that, In step S5, water glass is added as an inhibitor at a rate of 100-300 g / t per ton of copper oxide ore.

10. The method of using a composite surface activator for copper oxide ore as described in claim 6, characterized in that, In step S6, water glass is added as an inhibitor at a rate of 200-500 g / t per ton of copper oxide ore.