A method for lime-free and acid-free copper-sulfur flotation separation

Abstract

The application discloses a method for lime-free and acid-free copper-sulfur flotation separation, wherein a combined inhibitor for copper-sulfur separation comprises ferrous sulfate and amygdalin, and is used as a pyrite inhibitor in flotation separation of chalcopyrite and pyrite.The combined inhibitor ferrous sulfate and amygdalin, a collector and a foaming agent are added to a raw ore after crushing and grinding to perform a copper flotation operation, and after the copper flotation operation, a combined activator sodium percarbonate and copper sulfate, a combined collector and a foaming agent are added to the ore pulp to perform a sulfur flotation operation.The combined inhibitor ferrous sulfate and amygdalin has a strong inhibiting effect on pyrite, and can effectively realize flotation of chalcopyrite; the combined activator sodium percarbonate and copper sulfate has a good de-inhibiting and activating effect on pyrite, and can effectively realize flotation of pyrite, thereby reducing the mineral processing cost while enhancing the copper-sulfur separation effect, and having a good application prospect.

Description

Technical Field

[0001] This invention relates to a method for copper-sulfur flotation separation without lime or acid, belonging to the field of mineral processing reagents technology. Background Technology

[0002] In copper-iron sulfide ores, chalcopyrite and pyrite are both sulfide minerals with similar surface properties and small differences in floatability. They are prone to entrainment during flotation, affecting copper concentrate grade and recovery. Existing copper-sulfur separation processes typically employ a flow of "prioritizing copper flotation, suppressing pyrite, and subsequently activating pyrite to recover sulfur." ​​The key to this process is that the copper flotation stage must effectively suppress pyrite to reduce the influx of sulfur minerals into the copper concentrate; conversely, the sulfur flotation stage must restore the floatability of the suppressed pyrite to ensure sulfur resource recovery. Therefore, the selectivity, stability, and subsequent reactivation of pyrite suppressants are crucial factors affecting the effectiveness of copper-sulfur separation.

[0003] Currently, the lime-high-alkali method is commonly used in industry to suppress pyrite. This method increases the pH of the slurry by adding a large amount of lime, causing hydrophilic substances such as ferric hydroxide and calcium hydroxyl to form on the surface of the pyrite, thereby reducing its floatability. Lime is widely available and inexpensive, but it also has significant drawbacks. Large amounts of lime can cause high alkalinity in the slurry system, increasing reagent consumption and easily leading to problems such as equipment scaling, pipe blockage, and decreased slurry fluidity, affecting production stability. More importantly, pyrite strongly suppressed by lime usually requires the addition of large amounts of sulfuric acid for de-inhibition and activation in subsequent sulfur flotation to adjust the strongly alkaline slurry to a weakly alkaline state and restore its floatability. Sulfuric acid is highly corrosive, posing high safety risks during storage, transportation, preparation, and use. It easily corrodes equipment and pipelines, increasing maintenance costs, and can also cause fluctuations in the slurry's pH, increasing the pressure on wastewater treatment and environmental management.

[0004] To reduce dependence on lime and sulfuric acid, various inorganic or organic pyrite inhibitors have been proposed, such as oxidants, reducing agents, complexing agents, polysaccharides, natural polymers, and plant extracts. While these agents can improve copper-sulfur separation under certain conditions, they still suffer from problems such as insufficient selectivity, poor adaptability, high dosage, high cost, or unstable inhibitory effects. Furthermore, some inhibitors can affect subsequent pyrite activation and recovery, making it difficult to meet the requirements for green and efficient separation of complex copper-iron sulfide ores.

[0005] Therefore, there is an urgent need to develop a copper-sulfur separation method that does not require lime-based high-alkali inhibition or sulfuric acid-based strong acid activation. This method would selectively inhibit pyrite during the copper flotation stage while gently de-inhibiting and activating it during the sulfur flotation stage, achieving efficient recovery of both copper and sulfur concentrates. The lime-free and acid-free copper-sulfur separation method proposed in this invention helps reduce the safety, environmental, and equipment maintenance problems associated with high-alkali and strong acid reagents, and offers advantages such as being green, mild, efficient, and stable. Summary of the Invention

[0006] This invention aims to provide a lime- and acid-free method for copper-sulfur flotation separation to solve the aforementioned problems. The combined inhibitors used in this method selectively inhibit pyrite without affecting subsequent pyrite activation and recovery, achieving efficient and stable separation and recovery of copper and sulfur.

[0007] The combination inhibitors used in this invention include ferrous sulfate and amygdalin, wherein amygdalin is one of almond extract, peach kernel extract, and apple seed extract, and the mass ratio of ferrous sulfate to amygdalin is 1~1.5:1.

[0008] The present invention provides a method for copper-sulfur flotation separation without lime or acid, the specific steps of which are as follows: (1) Grind the primary copper-iron sulfide ore and then adjust the pulp to obtain the pulp to be flotated; (2) Add the combined inhibitor, collector and frother to the slurry to be floated in step (1) in sequence to carry out copper flotation roughing operation to obtain copper roughing concentrate and copper roughing tailings. (3) The copper roughing concentrate obtained in step (2) is subjected to a copper regrinding operation. After grinding, two copper beneficiation operations are performed. A combined inhibitor is added in the copper beneficiation operation I. The final copper concentrate is obtained after the two beneficiation operations. The tailings of beneficiation operation I and copper beneficiation operation II are returned to the previous operation to form a closed loop. (4) The copper roughing tailings obtained in step (2) are subjected to two copper scavenging operations. Collector and frother are added in the copper scavenging operation I. After the two copper scavenging operations, copper flotation tailings are obtained. The concentrate of scavenging operation I and the concentrate of scavenging operation II are returned to the previous operation to form a closed loop. (5) Add the combined activator, combined collector and frother to the copper flotation tailings in step (4) in sequence to carry out sulfur flotation roughing operation to obtain sulfur roughing concentrate and sulfur roughing tailings. (6) The sulfur rough concentrate obtained in step (5) is subjected to two sulfur beneficiation operations to obtain sulfur concentrate. The tailings of sulfur beneficiation I and sulfur beneficiation II are returned to the previous operation to form a closed loop. (7) The sulfur roughing tailings obtained in step (5) are subjected to two sulfur scavenging operations. In the sulfur scavenging operation I, a combination activator, collector and frother are added. After the two sulfur scavenging operations, sulfur flotation tailings are obtained. The sulfur scavenging I concentrate and the sulfur scavenging II concentrate are returned to the previous operation to form a closed loop.

[0009] The grinding conditions in step (1) of this invention are: fineness of -0.074mm accounts for 60-65%.

[0010] In step (2), the combined inhibitors are ferrous sulfate and amygdalin, with ferrous sulfate used at a dosage of 600~1200g / t, amygdalin used at a dosage of 600~800g / t, butyl xanthate used as a chalcopyrite collector at a dosage of 30~50g / t, and No. 2 oil used as a foaming agent at a dosage of 20~30g / t.

[0011] In step (3), the copper regrinding operation is as follows: the fineness of -0.074mm accounts for 90-95%, and the combined inhibitors are ferrous sulfate and amygdalin. The amount of ferrous sulfate is 150~375g / t, and the amount of amygdalin is 150~250g / t.

[0012] In step (4), butyl xanthate is used as a chalcopyrite collector at a dosage of 15-25 g / t, and No. 2 oil is used as a foaming agent at a dosage of 10-15 g / t.

[0013] In the combined inhibitors of steps (2), (3) and (4) of this invention, ferrous sulfate and amygdalin are both prepared as 1% mass concentration aqueous solution and added, and butyl xanthate is prepared as 5% mass concentration aqueous solution and added. In the copper flotation operation: the roughing operation time is 7~8 minutes, the scavenging operation time is 5~6 minutes, and the cleaning operation time is 6~7 minutes.

[0014] In step (5), the combined activator is sodium percarbonate and copper sulfate, with sodium percarbonate used at a rate of 120-150 g / t and copper sulfate used at a rate of 40-50 g / t. The combined collector is composed of ethyl xanthate, butyl xanthate and pentyl xanthate, with an addition ratio of 1:3:1. The combined collector is used at a rate of 20-30 g / t. No. 2 oil is used as a foaming agent at a rate of 15-25 g / t.

[0015] In step (7), the combined activator is sodium percarbonate and copper sulfate, wherein the amount of sodium percarbonate is 90~120g / t, the amount of copper sulfate is 30~40g / t, the combined collector is composed of ethyl xanthate, butyl xanthate and pentyl xanthate, the addition ratio of ethyl xanthate, butyl xanthate and pentyl xanthate is 1:3:1, the amount of combined collector is 10~20g / t, and No. 2 oil is used as a foaming agent, with an amount of 10~15g / t.

[0016] In steps (5) and (7) of this invention, the combined activator sodium percarbonate and copper sulfate are both prepared as aqueous solutions with a mass concentration of 1-3% and added. The combined collector is prepared as an aqueous solution with a mass concentration of 5% and added. In the sulfur flotation operation: the time for each roughing operation is 5-6 minutes, the time for each scavenging operation is 4-5 minutes, and the time for each cleaning operation is 5-6 minutes.

[0017] Add No. 2 oil according to the required weight based on the actual amount of ore.

[0018] The principle of this invention lies in overcoming the inherent defects of the traditional "lime high-alkali inhibition - sulfuric acid strong acid activation" process through a novel combined reagent system, achieving efficient and green copper-sulfur separation without lime or acid. In the copper flotation stage, this invention uses a combination of ferrous sulfate and amygdalin inhibitors to replace the traditional high-alkalinity lime. Ferrous sulfate not only eliminates the adverse effects of unavoidable ions and oxidizing environments in the slurry but also promotes the directional adsorption and stable coating of amygdalin on the pyrite surface, forming a dense hydrophilic film. This effectively prevents the interaction between pyrite and the collector, while chalcopyrite retains its good natural floatability, achieving efficient separation of copper and sulfur minerals. This inhibition method not only requires low reagent dosage but, more importantly, completely avoids the drawbacks of slurry system deterioration and equipment scaling caused by large amounts of lime. In the subsequent sulfur flotation stage, since lime was not used in the early stages, the slurry does not need to undergo the difficult transition from strong alkali to weak alkali, thus eliminating the need for sulfuric acid, which is highly corrosive and poses high safety risks in the traditional process. This invention only requires the introduction of a combined activator composed of sodium percarbonate and copper sulfate. The oxidizing properties of sodium percarbonate disrupt the hydrophilic film on the surface of pyrite, restoring its floatability. A small amount of copper sulfate provides copper ion sites, ensuring the overall recovery rate of pyrite. Highly efficient pyrite recovery can be achieved without strong acids. In summary, the reagent system of this invention achieves precise separation of copper and sulfur while completely eliminating the equipment wear, safety risks, and environmental pressures associated with strong acids and alkalis.

[0019] The beneficial effects of this invention are: (1) Using a combination of inhibitors (ferrous sulfate and amygdalin) to replace traditional lime achieves efficient selective inhibition of pyrite while avoiding the degradation of the slurry environment, scaling and corrosion of equipment, and hindrance to subsequent sulfur recovery caused by the high alkalinity of lime. The reagent dosage is low and it is highly adaptable to complex ores, significantly improving the flotation grade and recovery rate of chalcopyrite. The separation process is more environmentally friendly and more stable.

[0020] (2) Pyrite inhibited by the combined inhibitor system does not need to be activated by strong acid with sulfuric acid. It can be gently and efficiently activated by the combined activator (sodium percarbonate and copper sulfate), so as to achieve the recovery of sulfur resources smoothly. This eliminates the safety hazards and equipment wear caused by the strong corrosiveness of sulfuric acid, simplifies the process flow, and achieves efficient copper-sulfur separation and clean recovery of sulfur resources. Attached Figure Description

[0021] Figure 1 This is a process flow diagram of Embodiment 1 of the present invention. Detailed Implementation

[0022] Example: This example studies the flotation separation of a copper-iron sulfide ore in Yunnan Province. The raw ore contains 0.30-0.50% Cu and 5.00-7.00% S. The copper in the ore mainly exists in the form of chalcopyrite, and the sulfur mainly exists in the form of pyrite. The gangue minerals mainly include quartz, calcite, and pyroxene.

[0023] Example 1 uses a combination of ferrous sulfate and amygdalin as pyrite depressants for copper flotation, with a mass ratio of 1:1; and a combination of sodium percarbonate and copper sulfate as pyrite activators for sulfur flotation, with a mass ratio of 3:1. The flow chart is shown below. Figure 1 As shown, the specific steps are as follows: The copper-iron sulfide ore is crushed and ground to a fineness of -0.074 mm, accounting for 60%, to obtain the slurry to be flotated. (2) Add the combined inhibitor, collector and frother to the slurry to be floated in step (1) in sequence. The combined inhibitor is ferrous sulfate and amygdalin. The amount of ferrous sulfate is 600 g / t, the amount of amygdalin is 600 g / t, butyl xanthate is used as chalcopyrite collector and the amount is 30 g / t, and No. 2 oil is used as frother and the amount is 20 g / t. Copper flotation roughing operation is carried out. The roughing operation time is 7 minutes to obtain copper roughing concentrate and copper roughing tailings.

[0024] (3) The copper roughing concentrate obtained in step (2) is subjected to a copper regrinding operation until 90% of the fineness is -0.074 mm. Then, a combination of inhibitors is added to the slurry, which consists of ferrous sulfate and amygdalin. The dosage of ferrous sulfate is 150 g / t, and the dosage of amygdalin is 150 g / t. Copper refining operation I is then performed to obtain copper refining concentrate I and copper refining tailings I. The copper refining concentrate I is then subjected to a blank refining operation (copper refining II) to obtain copper concentrate and copper refining tailings II. Each refining operation lasts for 6 minutes. The copper refining tailings I and copper refining tailings II are returned to the copper roughing operation and the copper refining operation I, respectively, forming a closed loop.

[0025] (4) Collector and frother are added sequentially to the copper roughing tailings obtained in step (2). Butyl xanthate is used as the chalcopyrite collector at a dosage of 15 g / t, and No. 2 oil is used as the frother at a dosage of 10 g / t. Copper scavenging operation I is performed to obtain copper scavenging I concentrate and copper scavenging I tailings. The copper scavenging I tailings are then subjected to a blank scavenging operation (copper scavenging II) to obtain copper scavenging II concentrate and copper flotation tailings. Each scavenging operation lasts for 5 minutes. The copper scavenging I concentrate and copper scavenging II concentrate are returned to the copper roughing operation and the copper scavenging I operation, respectively, forming a closed loop.

[0026] (5) Add a combination activator, a combination collector and a frother to the copper flotation tailings in step (4) in sequence. The combination activator is sodium percarbonate and copper sulfate. The amount of sodium percarbonate is 120 g / t and the amount of copper sulfate is 40 g / t. The combination collector is composed of ethyl xanthate, butyl xanthate and pentyl xanthate. The addition ratio of ethyl xanthate, butyl xanthate and pentyl xanthate is 1:3:1 and the amount is 20 g / t. No. 2 oil is used as a frother and the amount is 15 g / t. The roughing operation of sulfur flotation is carried out. The roughing operation time is 5 minutes to obtain sulfur roughing concentrate and sulfur roughing tailings.

[0027] (6) Perform two blank cleaning operations (sulfur cleaning I and sulfur cleaning II) on the sulfur roughing concentrate from step (5). Each cleaning operation takes 5 minutes to obtain the final sulfur concentrate. The tailings of sulfur cleaning I and sulfur cleaning II are returned to the sulfur roughing operation and sulfur cleaning I operation respectively to form a closed loop.

[0028] (7) Add a combined activator, a combined collector, and a frother to the sulfur roughing tailings obtained in step (5) in sequence. The combined activator is sodium percarbonate and copper sulfate, with a sodium percarbonate dosage of 90 g / t and a copper sulfate dosage of 30 g / t. The combined collector consists of ethyl xanthate, butyl xanthate, and pentyl xanthate, with an addition ratio of 1:3:1 and a dosage of 10 g / t. No. 2 oil is used as the frother, with a dosage of 10 g / t. Perform sulfur scavenging operation I to obtain sulfur scavenging I concentrate and sulfur scavenging I tailings. Perform a blank scavenging operation (sulfur scavenging II) on the sulfur scavenging I tailings to obtain sulfur scavenging II concentrate and sulfur flotation tailings. Each scavenging operation lasts for 4 minutes. The sulfur scavenging I concentrate and sulfur scavenging II concentrate are returned to the sulfur roughing operation and sulfur scavenging I operation, respectively, forming a closed loop. The product indicators are shown in Table 1.

[0029] Example 2: The raw ore and process flow used in this example are the same as in Example 1, except that: In step (1), 62% of the rough concentrate was ground to a fineness of -0.074mm. In step (2), the copper rough concentrate was subjected to a copper regrinding operation to a fineness of -0.074mm, which accounted for 92%. In step (2), the dosage of ferrous sulfate was 840g / t, the dosage of amygdalin was 700g / t, the dosage of butyl xanthate was 40g / t, and the dosage of No. 2 oil was 25g / t. In step (3), the dosage of ferrous sulfate was 240g / t and the dosage of amygdalin was 200g / t. Step (4) Butyl xanthate dosage 20g / t, No. 2 oil dosage 12.5g / t; Step (5) Sodium percarbonate dosage 135g / t, copper sulfate dosage 45g / t, combined collector dosage 25g / t, No. 2 oil dosage 20g / t; Step (7) Sodium percarbonate dosage 105g / t, copper sulfate dosage 35g / t, combined collector dosage 15g / t, No. 2 oil dosage 12.5g / t, product indicators are shown in Table 1.

[0030] Example 3: The raw ore and process flow used in this example are the same as in Example 1, except that: In step (1), 65% of the copper roughing concentrate was ground to a fineness of -0.074 mm. In step (2), the copper roughing concentrate was subjected to a copper regrinding operation to a fineness of -0.074 mm, which accounted for 95%. In step (2), the dosage of ferrous sulfate was 1200 g / t, the dosage of amygdalin was 800 g / t, the dosage of butyl xanthate was 50 g / t, and the dosage of No. 2 oil was 30 g / t. In step (3), the dosage of ferrous sulfate was 375 g / t, and the dosage of amygdalin was 250 g / t. / t; Step (4) Butyl xanthate dosage 25g / t, No. 2 oil dosage 15g / t; Step (5) Sodium percarbonate dosage 150g / t, copper sulfate dosage 50g / t, combined collector dosage 30g / t, No. 2 oil dosage 25g / t; Step (7) Sodium percarbonate dosage 120g / t, copper sulfate dosage 40g / t, combined collector dosage 20g / t, No. 2 oil dosage 15g / t, product indicators are shown in Table 1.

[0031] Comparative Example 1: In this comparative example, the inhibitor was replaced with only amygdalin. The dosage of amygdalin and the dosage and addition method of other drugs were the same as in Example 1. Other process conditions remained unchanged, and the product indicators are shown in Table 1.

[0032] Comparative Example 2: In this comparative example, the activator was changed to copper sulfate only. The amount of copper sulfate and other reagents and the method of adding the reagents were the same as in Example 1. Other process conditions remained unchanged, and the product indicators are shown in Table 1.

[0033] Comparative Example 3: In this comparative example, conventional depressant lime was used as a depressant for pyrite in copper flotation. The lime addition amount in the roughing and cleaning stages I of the copper flotation operation was 1500 g / t and 700 g / t, respectively. Conventional activator sulfuric acid was used as an activator for pyrite in sulfur flotation. The sulfuric acid addition amount in the roughing and scavenging stages I of the sulfur flotation operation was 700 g / t and 300 g / t, respectively. Other process conditions remained unchanged, and the product indicators are shown in Table 1.

[0034] Table 1. Flotation separation results of the embodiments. As shown in the table, in Example 1, the copper grade and copper recovery rate in the copper concentrate were 19.52% and 92.02%, respectively, and the sulfur grade and sulfur recovery rate in the sulfur concentrate were 40.74% and 84.51%, respectively; in Example 2, the copper grade and copper recovery rate in the copper concentrate were 19.54% and 91.56%, respectively, and the sulfur grade and sulfur recovery rate in the sulfur concentrate were 40.65% and 84.20%, respectively; in Example 3, the copper grade and copper recovery rate in the copper concentrate were 19.55% and 91.05%, respectively, and the sulfur grade and sulfur recovery rate in the sulfur concentrate were 40.58% and 83%, respectively. 0.99%; In Comparative Example 1, the copper grade and copper recovery rate in the copper concentrate were 17.32% and 85.61%, respectively, and the sulfur grade and sulfur recovery rate in the sulfur concentrate were 38.67% and 76.30%, respectively; In Comparative Example 2, the copper grade and copper recovery rate in the copper concentrate were 19.51% and 91.42%, respectively, and the sulfur grade and sulfur recovery rate in the sulfur concentrate were 37.53% and 67.02%, respectively; In Comparative Example 3, the copper grade and copper recovery rate in the copper concentrate were 19.12% and 88.50%, respectively, and the sulfur grade and sulfur recovery rate in the sulfur concentrate were 38.49% and 78.32%, respectively.

[0035] Compared with Comparative Example 1, Example 1 showed that the copper grade and copper recovery rate in the copper concentrate increased by 2.2 and 6.41 percentage points, respectively, while the grade and recovery rate in the sulfur concentrate increased by 2.07 and 8.21 percentage points, respectively. This indicates that when using amygdalin as a single depressant, the copper flotation process has a poor inhibitory effect on pyrite, leading to poor subsequent sulfur flotation indicators and ultimately poor overall flotation process performance.

[0036] Compared with Comparative Example 2, Example 1 showed that the copper grade and copper recovery rate in the copper concentrate increased by 0.01 and 0.60 percentage points, respectively, while the grade and recovery rate in the sulfur concentrate increased by 3.21 and 17.49 percentage points, respectively. This indicates that the copper flotation performance was better when ferrous sulfate + amygdalin was used as a depressant; however, the activation effect on pyrite was poor when copper sulfate alone was used as an activator, resulting in poor sulfur flotation performance.

[0037] Compared with Comparative Example 3, Example 1 showed that the copper grade and copper recovery rate in copper concentrate increased by 0.4 and 3.52 percentage points, respectively, while the grade and recovery rate in sulfur concentrate increased by 2.25 and 6.19 percentage points, respectively. This indicates that ferrous sulfate + amygdalin as an inhibitor and copper sulfate + sodium percarbonate as an activator significantly improved the overall performance.

[0038] Compared to the traditional reagent of lime and sulfuric acid, the combination of ferrous sulfate and amygdalin as a depressant significantly improves the flotation effect in copper flotation; the combination of copper sulfate and sodium percarbonate as an activator significantly improves the flotation effect in sulfur flotation. However, if the combined depressant and activator are used in excessive amounts, the flotation performance will decrease. Therefore, when the reagent dosage is appropriate, the combination of depressant and activator is a highly efficient method for separating copper and sulfur without lime or acid.

[0039] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A method for copper-sulfur flotation separation without lime or acid, characterized in that, The specific steps are as follows: (1) Grind the primary copper-iron sulfide ore and then adjust the pulp to obtain the pulp to be flotated; (2) Add the combined inhibitor, collector and frother to the slurry to be floated in step (1) in sequence to carry out copper flotation roughing operation to obtain copper roughing concentrate and copper roughing tailings. (3) The copper roughing concentrate obtained in step (2) is subjected to a copper regrinding operation. After grinding, two copper beneficiation operations are performed. A combined inhibitor is added in the copper beneficiation operation I. The final copper concentrate is obtained after the two beneficiation operations. The tailings of beneficiation operation I and copper beneficiation operation II are returned to the previous operation to form a closed loop. (4) The copper roughing tailings obtained in step (2) are subjected to two copper scavenging operations. Collector and frother are added in the copper scavenging operation I. After the two copper scavenging operations, copper flotation tailings are obtained. The concentrate of scavenging operation I and the concentrate of scavenging operation II are returned to the previous operation to form a closed loop. (5) Add the combined activator, combined collector and frother to the copper flotation tailings in step (4) in sequence to carry out sulfur flotation roughing operation to obtain sulfur roughing concentrate and sulfur roughing tailings. (6) The sulfur rough concentrate obtained in step (5) is subjected to two sulfur beneficiation operations to obtain sulfur concentrate. The tailings of sulfur beneficiation I and sulfur beneficiation II are returned to the previous operation to form a closed loop. (7) The sulfur roughing tailings obtained in step (5) are subjected to two sulfur scavenging operations. In the sulfur scavenging operation I, a combination activator, collector and frother are added. After the two sulfur scavenging operations, sulfur flotation tailings are obtained. The sulfur scavenging I concentrate and the sulfur scavenging II concentrate are returned to the previous operation to form a closed loop. The combined inhibitors include ferrous sulfate and amygdalin, with a mass ratio of ferrous sulfate to amygdalin of 1 to 1.5:

1.

2. The method for copper-sulfur flotation separation without lime or acid according to claim 1, characterized in that: The combined inhibitor serves as an inhibitor for pyrite.

3. The method for copper-sulfur flotation separation without lime or acid according to claim 1, characterized in that: In step (1), 60-65% of the particles are ground to a fineness of -0.074 mm.

4. The method for copper-sulfur flotation separation without lime or acid according to claim 1, characterized in that: In step (2), the combined inhibitors are ferrous sulfate and amygdalin, with ferrous sulfate used at a rate of 600-1200 g / t and amygdalin used at a rate of 600-800 g / t. Butyl xanthate is used as a collector for chalcopyrite at a rate of 30-50 g / t, and No. 2 oil is used as a foaming agent at a rate of 20-30 g / t. In step (3), the copper regrinding operation is carried out by regrinding to a fineness of -0.074 mm accounting for 90-95%. The combined inhibitors are ferrous sulfate and amygdalin, with ferrous sulfate used at a rate of 150-375 g / t and amygdalin used at a rate of 150-250 g / t. In step (4), butyl xanthate is used as a collector for chalcopyrite at a rate of 15-25 g / t, and No. 2 oil is used as a foaming agent at a rate of 10-15 g / t.

5. The method for copper-sulfur flotation separation without lime or acid according to claim 1, characterized in that: In step (5), the combined activator is sodium percarbonate and copper sulfate, with sodium percarbonate used at a rate of 120-150 g / t and copper sulfate used at a rate of 40-50 g / t. The combined collector consists of ethyl xanthate, butyl xanthate, and pentyl xanthate, with an addition ratio of 1:3:

1. The combined collector is used at a rate of 20-30 g / t. No. 2 oil is used as a foaming agent at a rate of 15-25 g / t. In step (7), the combined activator is sodium percarbonate and copper sulfate, wherein the amount of sodium percarbonate is 90~120g / t, the amount of copper sulfate is 30~40g / t, the combined collector is composed of ethyl xanthate, butyl xanthate and pentyl xanthate, the addition ratio of ethyl xanthate, butyl xanthate and pentyl xanthate is 1:3:1, the amount of combined collector is 10~20g / t, and No. 2 oil is used as a foaming agent, with an amount of 10~15g / t.

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