A symbiotic copper-zinc-iron-sulfur ore separation composite inhibitor and application thereof

Abstract

The application discloses a symbiotic copper-zinc-iron-sulfur ore separation composite inhibitor and application thereof, wherein phytic acid, magnesium sulfate and sodium sulfite are mixed according to a mass ratio of 4:4:2. 3+ Sodium sulfite first plays a core role of constructing a reduction atmosphere and cleaning a mineral surface, a phosphoric acid group of phytic acid can form a stable Fe-PA complex with Fe 2+ (FeOOH) on the surface of pyrite, and Cu 2+ Mg in magnesium sulfate serves as a bridging ion, significantly enhances the adsorption strength and stability of phytic acid on the surface of pyrite, and the synergistic inhibition effect of the three composite reagents, so that effective separation of copper-zinc-sulfur minerals and pyrite in symbiotic high-sulfur copper-zinc ore is realized. Meanwhile, the composite inhibitor has an auxiliary mild inhibition effect on sphalerite in the copper-zinc separation process, auxiliary realization of copper-zinc separation is realized, and the copper-zinc separation efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of polymetallic sulfide ore beneficiation technology, specifically to a composite inhibitor for the separation of symbiotic copper-zinc-iron sulfide ores and its application. Background Technology

[0002] Copper-zinc sulfide ores are important non-ferrous metal mineral resources. Effective suppression of pyrite during flotation separation is a key technical challenge for improving the quality of copper-zinc concentrates. Associated, easily beneficiated and separated polymetallic sulfide mineral resources are increasingly depleted, while complex, difficult-to-separate high-sulfur copper-zinc sulfide mineral resources are gradually being developed and utilized. However, because the floatability of pyrite (FeS2) in these ores is extremely similar to that of chalcopyrite (CuFeS2) and sphalerite (ZnS), traditional processes struggle to achieve efficient separation. Even when separation is achieved during high-pressure, high-tension processes, the concentrate exchange rate remains high, resulting in resource waste.

[0003] Currently, commonly used pyrite compound inhibitors in industry mainly include: (1) Lime method: Pyrite is inhibited by increasing the pH of the slurry (>12), but the high alkalinity environment leads to serious scaling and clogging of the equipment, and the amount of lime used is large, resulting in high cost of subsequent wastewater treatment; (2) SO2 method: The reducing property of sulfur dioxide is used to suppress pyrite, but SO2 gas corrodes equipment and pollutes the environment; (3) Zinc salt method: Zinc salts such as zinc sulfate can inhibit sphalerite, but have limited inhibitory effect on pyrite; (4) Organic compound inhibitors: including tannic acid, sodium humate, starch, dextrin, carboxymethyl cellulose (CMC), carrageenan, lignin sulfonate, etc. These compound inhibitors are environmentally friendly, but their selectivity is not high enough when used alone. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention aims to provide a composite inhibitor for the separation of symbiotic copper-zinc-iron sulfide ores and its application.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A composite inhibitor for the separation of symbiotic copper-zinc-iron sulfide ores comprises phytic acid, magnesium sulfate, and sodium sulfite, with a mass ratio of phytic acid:magnesium sulfate:sodium sulfite = 4:4:2.

[0006] The present invention also provides an application of the above-mentioned composite inhibitor in the separation and flotation of symbiotic copper-zinc-iron sulfide ores.

[0007] Furthermore, the above application includes the following steps: S1. Selective inhibition of grinding process: The associated high-sulfur copper-zinc sulfide ore, lime and the composite inhibitor described in claim 1 are added together to a ball mill for grinding to achieve the target grinding fineness; S2, Separation of copper-zinc sulfide ore from sulfur: The slurry obtained from the grinding product in step S1 is added to the flotation machine, the slurry mass concentration is adjusted, then Z-200 is added and stirred, and then copper-zinc sulfide ore and pyrite are separated by roughing and two separate scavenging processes to obtain copper-zinc rough concentrate and copper-zinc mixed flotation tailings. S3. Separation after regrinding of copper-zinc rough concentrate: Lime, activated carbon, zinc sulfate and the composite inhibitor are added to the copper-zinc rough concentrate obtained in step S2, and then it is regrinded to the target fineness. Z-200 is added for rough separation of copper and zinc-sulfur, followed by two cleaning and one scavenging processes to finally obtain copper concentrate and copper flotation tailings. Lime, the composite inhibitor, butyl xanthate and No. 2 oil are added to the copper flotation tailings for zinc rough separation, followed by two zinc cleaning and one zinc scavenging processes to finally obtain zinc concentrate and sulfur concentrate 1. S4. Sulfur beneficiation of copper-zinc mixed flotation tailings: Add copper sulfate, butyl xanthate and No. 2 oil to the copper-zinc mixed flotation tailings obtained in step S2 for a first sulfur roughing, followed by a second sulfur cleaning and a third sulfur scavenging, and finally obtain flotation tailings and sulfur concentrate 2.

[0008] Further, in step S1, the particle size of the associated high-sulfur copper-zinc sulfide ore is -2mm; based on the dry weight of each kilogram of associated high-sulfur copper-zinc sulfide ore, the dosage of lime and composite inhibitor is 0.5-2g / kg and 0.5-1.5g / kg, respectively.

[0009] Further, in step S2, the slurry concentration is 30-35%, and the dosage of Z-200 is 0.04-0.08 g / kg based on the dry weight of each kilogram of associated high-sulfur copper-zinc sulfide ore, with a stirring time of 2 minutes after addition; the aeration rate for both the roughing and the two scavenging processes of the copper-zinc sulfide ore and pyrite is 0.3 m³. 3 / h, the pH value of the pulp for the roughing separation of copper-zinc sulfide ore and pyrite is 8-10.

[0010] Further, in step S3, based on the dry weight of each kilogram of associated high-sulfur copper-zinc sulfide ore, the amounts of lime, activated carbon, zinc sulfate, and composite inhibitor added to the copper-zinc rough concentrate are 0.1-0.2 g / kg, 0.2-0.4 g / kg, 0.2-0.4 g / kg, and 0.5-1 g / kg, respectively; the amount of Z-200 added after regrinding is 0.005-0.015 g / kg; the regrinding fineness is -0.037 mm particle size accounting for 70-90%; the amounts of lime, composite inhibitor, butyl xanthate, and No. 2 oil added to the copper flotation tailings are 0.2-0.6 g / kg, 0.5-1 g / kg, 0.03-0.05 g / kg, and 0.01-0.03 g / kg, respectively.

[0011] Furthermore, in step S4, based on the dry weight of each kilogram of co-associated high-sulfur copper-zinc sulfide ore, the amounts of copper sulfate, butyl xanthate, and No. 2 oil are 0.1-0.3 g / kg, 0.05-0.08 g / kg, and 0.04-0.06 g / kg, respectively.

[0012] Further, in step S2, after the roughing separation of copper-zinc sulfide ore and pyrite, copper-zinc rough concentrate and roughing tailings are obtained. The roughing tailings are subjected to two separate scavenging processes. The middlings obtained from the first separate scavenging process are returned to the roughing separation of copper-zinc sulfide ore and pyrite in sequence, and the tailings obtained are entered into the next separate scavenging process. The middlings obtained from the second separate scavenging process are returned to the first separate scavenging process in sequence. The resulting tailings are the copper-zinc mixed flotation tailings.

[0013] Furthermore, in step S3, the concentrate obtained from the roughing separation of copper and zinc-sulfur is subjected to two cleaning processes, and the tailings obtained are subjected to one scavenging process. In the first cleaning process, the middlings obtained are returned to the roughing separation operation of copper and zinc-sulfur, and the concentrate obtained is entered into the next cleaning process. In the second cleaning process, the middlings obtained are returned to the first cleaning process, and the concentrate obtained is copper concentrate. The middlings obtained from the first scavenging process are returned to the roughing separation operation of copper and zinc-sulfur, and the tailings obtained are copper flotation tailings.

[0014] Further, in step S3, the concentrate obtained from the zinc roughing process is subjected to two zinc cleaning processes, and the tailings obtained are subjected to one zinc scavenging process; in the first zinc cleaning process, the concentrate obtained enters the second zinc cleaning process, and the middlings obtained are returned to the zinc roughing process; in the second zinc cleaning process, the concentrate obtained is the zinc concentrate, and the middlings obtained are returned to the first zinc cleaning process; the middlings obtained from the first zinc scavenging process are returned to the zinc roughing process, and the tailings obtained are the sulfur concentrate 1.

[0015] Furthermore, in step S4, the concentrate obtained from the sulfur roughing process enters the sulfur cleaning process, and the tailings obtained enter the sulfur scavenging process; the concentrate obtained from the sulfur cleaning process is sulfur concentrate 2, and the middlings obtained are returned to the sulfur roughing process; the middlings obtained from the sulfur scavenging process are returned to the sulfur roughing process, and the tailings obtained are the final flotation tailings.

[0016] The beneficial effects of this invention are as follows: The composite inhibitor of the present invention, phytic acid: magnesium sulfate: sodium sulfite in a ratio of 4:4:2, has the following enhanced separation effect: Sodium sulfite first plays a core role in creating a reducing atmosphere and cleaning the mineral surface; the phosphate groups of phytic acid can react with Fe on the surface of pyrite. 3+ (FeOOH) forms a stable Fe-PA complex, while simultaneously removing surface Cu. 2+ The secondary activation of pyrite inhibits its floatability, and the Mg in magnesium sulfate... 2+As a bridging ion, it significantly enhances the adsorption strength and stability of phytic acid on the pyrite surface. The synergistic inhibitory effect of the three composite agents achieves effective separation of copper-zinc sulfide minerals and pyrite in associated high-sulfur copper-zinc ores, avoiding the problems of high consumption of separation agents and high mutual content in the separation product concentrate caused by the strong pressure and pulling in traditional processes. At the same time, in the copper-zinc separation process, the composite inhibitor has a mild inhibitory effect on sphalerite, which helps to achieve copper-zinc separation and improves the copper-zinc separation efficiency. It solves the problem that traditional copper-zinc separation processes and agents are difficult to obtain qualified copper concentrate and zinc concentrate, or that the mutual content in the copper-zinc separation concentrate exceeds the standard, which affects the comprehensive recovery of associated metals. Attached Figure Description

[0017] Figure 1 This is a flowchart of the method in Embodiments 1-2 of the present invention. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings. It should be noted that this embodiment is based on the present technical solution and provides detailed implementation methods and specific operation processes, but the protection scope of the present invention is not limited to this embodiment.

[0019] Example 1 This embodiment provides an application of a composite inhibitor for the separation of symbiotic copper-zinc-iron sulfide ores in the flotation process of symbiotic copper-zinc-iron sulfide ores, such as... Figure 1 As shown, it includes the following steps: S1. 1000g of co-associated high-sulfur copper-zinc sulfide ore (A) (-2mm particle size), 0.5g of lime (1), and 0.5g of composite inhibitor (2) (mass ratio of phytic acid: magnesium sulfate: sodium sulfite = 4:4:2) are added to a ball mill for grinding. The grinding fineness is -200 mesh, accounting for 70%. S2. Add the grinding product (B) from step S1 to the flotation machine, adjust the pulp concentration to 30%, and at this time the pulp pH is 8. Add 0.04g of Z-200 (3) and stir for 2 minutes. After a closed-circuit flotation process of separating roughing from copper-zinc sulfide ore and pyrite and two separate scavenging processes, copper-zinc rough concentrate (C) and copper-zinc mixed flotation tailings (H) are obtained. The aeration rate for separating roughing from copper-zinc sulfide ore and pyrite and two separate scavenging processes is 0.3m. 3 / h.

[0020] Specifically, after the roughing separation of copper-zinc sulfide ore and pyrite, copper-zinc rough concentrate and roughing tailings are obtained. The roughing tailings are then subjected to two separate scavenging processes. The middlings obtained from the first separate scavenging process are returned sequentially to the roughing separation of copper-zinc sulfide ore and pyrite, and the resulting tailings are entered into the next separate scavenging process. The middlings obtained from the second separate scavenging process are returned sequentially to the first separate scavenging process. The resulting tailings are the copper-zinc mixed flotation tailings.

[0021] S3. Add 0.1g of lime (1), 0.2g of activated carbon (5), 0.2g of zinc sulfate (6), and 0.5g of composite inhibitor (2) to the copper-zinc rough concentrate (C) obtained in step S2. Then, refmill the mixture with a small mill until the particle size of -0.037mm accounts for 70%. Add 0.005g of Z-200 (3) for rough separation of copper and zinc-sulfur. Then, perform a closed-loop process of two cleaning and one scavenging to obtain copper concentrate (D) and copper flotation tailings (E). Add 0.2g of lime (1), 0.5g of composite inhibitor (2), 0.03g of butyl xanthate (7), and 0.01g of No. 2 oil (4) to the copper flotation tailings for rough zinc separation. Then, perform a closed-loop process of two zinc cleaning and one zinc scavenging to obtain zinc concentrate (F) and sulfur concentrate 1 (G). Specifically, the concentrate obtained from the roughing separation of copper and zinc-sulfur undergoes two cleaning processes, and the tailings obtained undergo one scavenging process. In the first cleaning process, the middlings obtained are returned to the roughing separation of copper and zinc-sulfur, and the concentrate obtained is sent to the next cleaning process. In the second cleaning process, the middlings obtained are returned to the first cleaning process, and the concentrate obtained is the copper concentrate. The middlings obtained from the first scavenging process are returned to the roughing separation of copper and zinc-sulfur, and the tailings obtained are the copper flotation tailings.

[0022] Specifically, the concentrate obtained from the zinc roughing process undergoes two zinc cleaning processes, and the tailings obtained undergo one zinc scavenging process. In the first zinc cleaning process, the concentrate obtained enters the second zinc cleaning process, and the middlings obtained are returned to the zinc roughing process. In the second zinc cleaning process, the concentrate obtained is the zinc concentrate, and the middlings obtained are returned to the first zinc cleaning process. The middlings obtained from the first zinc scavenging process are returned to the zinc roughing process, and the tailings obtained are the sulfur concentrate 1.

[0023] S4. Add 0.1g of copper sulfate (8), 0.05g of butyl xanthate (7), and 0.04g of No. 2 oil (4) to the copper-zinc mixed flotation tailings (H) obtained in step S2. After one roughing, one cleaning and one scavenging closed-loop process, flotation tailings (J) and sulfur concentrate 2 (R) are obtained.

[0024] Specifically, the concentrate obtained from the sulfur roughing process enters the sulfur cleaning process, and the tailings obtained enter the sulfur scavenging process; the concentrate obtained from the sulfur cleaning process is sulfur concentrate 2, and the middlings obtained are returned to the sulfur roughing process; the middlings obtained from the sulfur scavenging process are returned to the sulfur roughing process, and the tailings obtained are the final flotation tailings.

[0025] Testing revealed that the raw ore used in this embodiment had a copper grade of 0.2%, a zinc grade of 0.4%, and a sulfur grade of 18%. The copper concentrate obtained in this embodiment had a copper grade of 22.15% and a copper recovery rate of 66.85%; the zinc concentrate had a zinc grade of 46.12% and a zinc recovery rate of 78.12%; sulfur concentrate 1 contained 40.23% sulfur with a sulfur recovery rate of 15.15%; and sulfur concentrate 2 contained 45.25% sulfur with a sulfur recovery rate of 75.20%.

[0026] Comparative Example 1 A combination of traditional lime and sulfite processes was used as zinc-sulfur inhibition, and a traditional copper-zinc-sulfur priority process was employed. 1g of lime and 1g of sodium metabisulfite were added to 1000g of the same raw ore as in Example 1, followed by water and grinding in a ball mill to the same fineness as in Example 1. Then, 0.04g of Z-200 and 0.04g of No. 2 oil were added and stirred for 2 minutes. A closed-loop process of one roughing, two scavenging, and two cleaning processes was used to obtain copper concentrate and copper tailings. 4g of lime, 0.04g of butyl xanthate, and 0.02g of No. 2 oil were added to the copper tailings for a closed-loop process of one zinc roughing, two zinc cleaning, and one zinc scavenging to obtain zinc concentrate and zinc tailings. Finally, 0.04g of copper sulfate, 0.08g of butyl xanthate, and 0.01g of No. 2 oil were added to the zinc tailings, followed by a closed-loop flotation process of one roughing, one cleaning, and one scavenging to obtain sulfur concentrate and flotation tailings.

[0027] Testing revealed that the copper concentrate obtained by this comparative method had a copper grade of 16.55% and a copper recovery rate of 50.24%; the zinc concentrate had a zinc grade of 42.18% and a zinc recovery rate of 65.15%; and the sulfur concentrate contained 42.25% sulfur and had a sulfur recovery rate of 80.55%. Compared with Example 1, the recovery rates of copper, zinc, and sulfur in the copper, zinc, and sulfur concentrates of this comparative example were all lower, and the concentrate grades were also lower.

[0028] Comparative Example 2 The compound inhibitor used is a combination of lime, zinc sulfate, sulfurous acid, and sodium sulfide, employing a traditional copper-zinc-sulfur priority process. Add 1g of lime, 1g of zinc sulfate, 0.5g of sodium sulfite, and 0.5g of sodium sulfide to 1000g of the same raw ore as in Example 1, then add water and grind in a ball mill to the same grinding fineness as in Example 1. Then add 0.05g of Z-200 and 0.05g of No. 2 oil and stir for 2 minutes. Obtain copper concentrate and copper tailings through a closed-loop process of one roughing, two scavenging, and two cleaning. Add 4g of lime, 0.05g of butyl xanthate, and 0.02g of No. 2 oil to the copper tailings and perform a closed-loop process of one zinc roughing, two zinc cleaning, and one zinc scavenging to obtain zinc concentrate and zinc tailings. Add 0.03g of copper sulfate, 0.08g of butyl xanthate, and 0.02g of No. 2 oil to the zinc tailings and perform a closed-loop flotation process of one roughing, one cleaning, and one scavenging to obtain sulfur concentrate and flotation tailings.

[0029] Testing revealed that the copper concentrate obtained using this comparative method had a copper grade of 14.25% and a copper recovery rate of 42.55%; the zinc concentrate had a zinc grade of 38.55% and a zinc recovery rate of 60.45%; and the sulfur concentrate contained 40.88% sulfur and had a sulfur recovery rate of 82.55%. Compared to Example 1, the copper, zinc, and sulfur recoveries in the copper, zinc, and sulfur concentrates of this comparative example were all lower, and the concentrate grades were also lower.

[0030] Example 2 This embodiment provides an application of a composite inhibitor for the separation of symbiotic copper-zinc-iron sulfide ores, such as... Figure 1 As shown, it includes the following steps: S1. Add 1000g of co-existing high-sulfur copper-zinc sulfide ore (-2mm particle size), 2g of lime, and 1.5g of composite inhibitor (phytic acid: magnesium sulfate: sodium sulfite in a ratio of 4:4:2) to a ball mill for grinding. The grinding fineness is -200 mesh, accounting for 65%. S2. Add the grinding product from step S1 to the flotation machine, adjust the pulp concentration to 34%, and at this point, the pulp pH is 10. Add 0.08g of Z-200 and stir for 2 minutes. The process follows a closed-circuit flotation process (same as in Example 1) involving roughing and two separate scavenging stages of copper-zinc sulfide ore and pyrite, yielding copper-zinc rough concentrate and copper-zinc mixed tailings. The aeration rate for both the roughing and two separate scavenging stages of copper-zinc sulfide ore and pyrite is 0.3m³. 3 / h; S3. Add 0.2g of lime, 0.4g of activated carbon, 0.4g of zinc sulfate and 1g of composite inhibitor to the copper-zinc rough concentrate obtained in step S2, then refmill it with a small mill until -0.037mm accounts for 90%, then add 0.015g of Z-200, and carry out rough separation of copper and zinc-sulfur, followed by a closed-loop process of two cleaning and one scavenging (same as in Example 1) to obtain copper concentrate and copper flotation tailings; A closed-loop process (same as in Example 1) was used to add 0.6g of lime, 1g of compound inhibitor, 0.05g of butyl xanthate and 0.03g of No. 2 oil to copper flotation tailings to obtain zinc concentrate and sulfur concentrate 1 by adding lime, 1g of compound inhibitor, 0.05g of butyl xanthate and 0.03g of No. 2 oil to copper flotation tailings. S4. Add 0.3g of copper sulfate, 0.08g of butyl xanthate, and 0.06g of No. 2 oil to the copper-zinc mixed flotation tailings slurry obtained in step S2. After one roughing, one cleaning, and one scavenging closed-loop process (the same as in Example 1), flotation tailings and sulfur concentrate 2 are obtained.

[0031] Testing revealed that the raw ore used in this embodiment had a copper grade of 1.4%, a zinc grade of 1.6%, and a sulfur grade of 31%. The copper concentrate obtained by the method in this embodiment had a copper grade of 24.55% and a copper recovery rate of 87.55%, the zinc concentrate had a zinc grade of 48.55% and a zinc recovery rate of 90.12%, sulfur concentrate 1 contained 43.25% sulfur and had a sulfur recovery rate of 25.45%, and sulfur concentrate 2 contained 46.45% sulfur and had a sulfur recovery rate of 60.85%.

[0032] Comparative Example 3 A combination of traditional lime and sulfite processes was used as zinc-sulfur inhibition, and a traditional copper-zinc-sulfur priority process was employed. 4g of lime and 2g of sodium metabisulfite were added to 1000g of the same raw ore as in Example 2, followed by water and grinding in a ball mill to the same fineness as in Example 2. Then, 0.05g of Z-200 and 0.05g of No. 2 oil were added and stirred for 2 minutes. A closed-loop process of one roughing, two scavenging, and two cleaning processes was used to obtain copper concentrate and copper tailings. 6g of lime, 0.07g of butyl xanthate, and 0.03g of No. 2 oil were added to the copper tailings for a closed-loop process of one zinc roughing, two zinc cleaning, and one zinc scavenging to obtain zinc concentrate and zinc tailings. Finally, 0.04g of copper sulfate, 0.12g of butyl xanthate, and 0.02g of No. 2 oil were added to the zinc tailings, and a closed-loop flotation process of one roughing, one cleaning, and one scavenging was used to obtain sulfur concentrate and flotation tailings.

[0033] Testing revealed that the copper concentrate obtained by this comparative method had a copper grade of 18.21% and a copper recovery rate of 71.55%, the zinc concentrate had a zinc grade of 44.58% and a zinc recovery rate of 70.15%, and the sulfur concentrate contained 43.56% sulfur with a sulfur recovery rate of 85.11%. Compared with Example 2, the copper and zinc grades and recoveries of the copper and zinc concentrates obtained in this comparative example are both lower.

[0034] Comparative Example 4 The compound inhibitor used is a combination of lime, zinc sulfate, sulfurous acid, and sodium sulfide, employing a traditional copper-zinc-sulfur priority process. 1000g of the same raw ore as in Example 2 was mixed with 4g lime, 2g zinc sulfate, 1.5g sodium sulfite, and 0.5g sodium sulfide, then water was added and the mixture was ground in a ball mill to the same grinding fineness as in Example 2. Then, 0.06g Z-200 and 0.06g No. 2 oil were added and stirred for 2 minutes. A closed-loop process of one roughing, two scavenging, and two cleaning was used to obtain copper concentrate and copper tailings. 6g lime, 0.06g butyl xanthate, and 0.02g No. 2 oil were added to the copper tailings for a closed-loop process of one zinc roughing, two zinc cleaning, and one zinc scavenging to obtain zinc concentrate and zinc tailings. 0.04g copper sulfate, 0.14g butyl xanthate, and 0.02g No. 2 oil were added to the zinc tailings for a closed-loop flotation process of one roughing, one cleaning, and one scavenging to obtain sulfur concentrate and flotation tailings.

[0035] Testing revealed that the copper concentrate obtained by this comparative method had a copper grade of 22.52% and a copper recovery rate of 67.85%, the zinc concentrate had a zinc grade of 41.25% and a zinc recovery rate of 70.45%, and the sulfur concentrate contained 43.52% sulfur with a sulfur recovery rate of 85.41%. Compared with Example 2, the recovery rates of copper, zinc, and sulfur in the copper, zinc, and sulfur concentrates of this comparative method were all lower, and the concentrate grades were also lower.

[0036] For those skilled in the art, various corresponding changes and modifications can be made based on the above technical solutions and concepts, and all such changes and modifications should be included within the protection scope of the claims of this invention.

Claims

1. A composite inhibitor for the separation of symbiotic copper-zinc-iron sulfide ores, characterized in that, It includes phytic acid, magnesium sulfate, and sodium sulfite, with a mass ratio of phytic acid: magnesium sulfate: sodium sulfite = 4:4:

2.

2. The application of the composite inhibitor of claim 1 in the separation and flotation of symbiotic copper-zinc-iron sulfide ores.

3. The application according to claim 2, characterized in that, Includes the following steps: S1. Selective inhibition of grinding process: The associated high-sulfur copper-zinc sulfide ore, lime and the composite inhibitor described in claim 1 are added together to a ball mill for grinding to achieve the target grinding fineness; S2, Separation of copper-zinc sulfide ore from sulfur: The slurry obtained from the grinding product in step S1 is added to the flotation machine, the slurry mass concentration is adjusted, then Z-200 is added and stirred, and then copper-zinc sulfide ore and pyrite are separated by roughing and two separate scavenging processes to obtain copper-zinc rough concentrate and copper-zinc mixed flotation tailings. S3. Separation after regrinding of copper-zinc rough concentrate: Lime, activated carbon, zinc sulfate and the composite inhibitor are added to the copper-zinc rough concentrate obtained in step S2, and then it is regrinded to the target fineness. Z-200 is added for rough separation of copper and zinc-sulfur, followed by two cleaning and one scavenging processes to finally obtain copper concentrate and copper flotation tailings. Lime, the composite inhibitor, butyl xanthate and No. 2 oil are added to the copper flotation tailings for zinc rough separation, followed by two zinc cleaning and one zinc scavenging processes to finally obtain zinc concentrate and sulfur concentrate 1. S4. Sulfur beneficiation of copper-zinc mixed flotation tailings: Add copper sulfate, butyl xanthate and No. 2 oil to the copper-zinc mixed flotation tailings obtained in step S2 for a first sulfur roughing, followed by a second sulfur cleaning and a third sulfur scavenging, and finally obtain flotation tailings and sulfur concentrate 2.

4. The application according to claim 3, characterized in that, In step S1, the particle size of the associated high-sulfur copper-zinc sulfide ore is -2mm; the dosage of lime and composite inhibitor is 0.5-2g / kg and 0.5-1.5g / kg respectively, based on the dry weight of each kilogram of the associated high-sulfur copper-zinc sulfide ore; in step S2, the slurry concentration is 30-35%, and the dosage of Z-200 is 0.04-0.08g / kg, based on the dry weight of each kilogram of the associated high-sulfur copper-zinc sulfide ore, with a stirring time of 2 minutes after addition; the aeration rate for both the roughing and two scavenging processes of the copper-zinc sulfide ore and pyrite separation is 0.3m³. 3 / h, the pH value of the pulp for the roughing separation of copper-zinc sulfide ore and pyrite is 8-10.

5. The application according to claim 3, characterized in that, In step S3, based on the dry weight of each kilogram of associated high-sulfur copper-zinc sulfide ore, the amounts of lime, activated carbon, zinc sulfate, and composite inhibitor added to the copper-zinc rough concentrate are 0.1-0.2 g / kg, 0.2-0.4 g / kg, 0.2-0.4 g / kg, and 0.5-1 g / kg, respectively. The amount of Z-200 added after regrinding is 0.005-0.015 g / kg. The regrinding fineness is -0.037 mm particle size accounting for 70-90%. The amounts of lime, composite inhibitor, butyl xanthate, and No. 2 oil added to the copper flotation tailings are 0.2-0.6 g / kg, 0.5-1 g / kg, 0.03-0.05 g / kg, and 0.01-0.03 g / kg, respectively.

6. The application according to claim 3, characterized in that, In step S4, based on the dry weight of each kilogram of co-associated high-sulfur copper-zinc sulfide ore, the dosages of copper sulfate, butyl xanthate, and No. 2 oil are 0.1-0.3 g / kg, 0.05-0.08 g / kg, and 0.04-0.06 g / kg, respectively.

7. The application according to claim 3, characterized in that, In step S2, after the roughing separation of copper-zinc sulfide ore and pyrite, copper-zinc rough concentrate and roughing tailings are obtained. The roughing tailings are subjected to two separate scavenging processes. The middlings obtained from the first separate scavenging process are returned to the roughing separation of copper-zinc sulfide ore and pyrite in sequence, and the tailings obtained are entered into the next separate scavenging process. The middlings obtained from the second separate scavenging process are returned to the first separate scavenging process in sequence. The resulting tailings are the copper-zinc mixed flotation tailings.

8. The application according to claim 3, characterized in that, In step S3, the concentrate obtained from the roughing separation of copper and zinc-sulfur undergoes two cleaning processes, and the tailings obtained undergo one scavenging process. In the first cleaning process, the middlings obtained are returned to the roughing separation of copper and zinc-sulfur, and the concentrate obtained is entered into the next cleaning process. In the second cleaning process, the middlings obtained are returned to the first cleaning process, and the concentrate obtained is the copper concentrate. The middlings obtained from the first scavenging process are returned to the roughing separation of copper and zinc-sulfur, and the tailings obtained are the copper flotation tailings.

9. The application according to claim 3, characterized in that, In step S3, the concentrate obtained from the zinc roughing process is subjected to two zinc cleaning processes, and the tailings obtained are subjected to one zinc scavenging process. In the first zinc cleaning process, the concentrate obtained enters the second zinc cleaning process, and the middlings obtained are returned to the zinc roughing process. In the second zinc cleaning process, the concentrate obtained is the zinc concentrate, and the middlings obtained are returned to the first zinc cleaning process. The middlings obtained from the first zinc scavenging process are returned to the zinc roughing process, and the tailings obtained are the sulfur concentrate 1.

10. The application according to claim 3, characterized in that, In step S4, the concentrate obtained from the sulfur roughing process enters the sulfur cleaning process, and the tailings obtained enter the sulfur scavenging process; the concentrate obtained from the sulfur cleaning process is sulfur concentrate 2, and the middlings obtained are returned to the sulfur roughing process; the middlings obtained from the sulfur scavenging process are returned to the sulfur roughing process, and the tailings obtained are the final flotation tailings.

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