Copper-nickel sulfide ore machine-column combined copper-nickel rough concentrate regrinding and sorting method

Abstract

The invention discloses a machine-column combined copper-nickel rough concentrate regrinding and sorting method for copper-nickel sulfide ore. The method comprises the following steps that S1, first-stage ore grinding is conducted, specifically, raw ore is subjected to first-stage ore grinding and grading; s2, first-stage roughing, wherein water is added into a raw ore product obtained after first-stage grinding and grading in a stirring tank for size mixing; s3, rough concentrate regrinding is conducted, specifically, concentrate obtained after first-stage roughing is conveyed to a regrinding ball mill grading cyclone to be graded; s4, finely selecting the first four tanks in one section once; s5, performing one-section and one-time fine selection for six grooves; s6, first-stage secondary fine selection; s7, one-stage and one-time fine scavenging; s8, second-stage ore grinding; s9, second-stage roughing is conducted; s10, first four tanks are finely selected for the first time in the second section; s11, carrying out second-section primary fine selection on the rear 6 tanks; s12, carrying out second-stage secondary fine selection; s13, second-stage primary fine scavenging is carried out; s14, second-section primary flotation column fine selection is carried out; s15, two-stage primary scavenging is carried out; s16, second-stage secondary scavenging is carried out; and S17, second-section secondary flotation column fine selection is carried out.

Description

Technical Field

[0001] This invention relates to the technical field of beneficiation methods for nickel-copper sulfide ore, and particularly to a method for regrinding and separating copper-nickel rough and concentrate from nickel-copper sulfide ore using a combination of milling and column grinding. Background Technology

[0002] Currently, flotation is the most widely used beneficiation process for nickel-copper sulfide ores. Taking a large-scale nickel-copper sulfide ore beneficiation plant as an example: two-stage grinding, two-stage roughing, multiple cleaning stages, and rough scavenging produce two products: high-grade concentrate and low-grade concentrate. However, with increasing mining depth, the ore's distribution becomes increasingly complex, and the ore throughput increases annually. The existing beneficiation process has reached a bottleneck in terms of production capacity and technical indicators, making it difficult to effectively recover fine-grained minerals. Furthermore, as the grinding fineness gradually increases, the proportion of fine-grained minerals in the second-stage slurry significantly increases, further deteriorating the second-stage flotation environment, leading to decreased concentrate quality, reduced system stability, and low resource utilization.

[0003] This process revealed the following problems: Low recovery rate: Traditional processes are not capable of capturing fine-grained valuable minerals, resulting in a large amount of valuable metals being lost with the tailings, which directly reduces the final metal recovery rate.

[0004] Middlings recycling vicious expansion: Fine-grained minerals that cannot be effectively recovered are repeatedly recycled in the process, causing the amount of middlings in flotation to increase continuously. This not only increases the energy consumption of equipment and pumps, but also seriously deteriorates the flotation environment (such as sticky foam and poor selectivity).

[0005] Deterioration of concentrate quality: The fine-grained gangue minerals (such as magnesium-containing minerals) that accumulate in the cycle are difficult to separate effectively in the roughing stage, resulting in excessive levels of harmful impurities such as magnesium oxide (MgO) in the flotation concentrate, which affects the quality of concentrate products and sales prices.

[0006] Limited system processing capacity: The huge amount of middlings circulation occupies a large amount of flotation volume, which restricts the system's processing capacity and becomes a bottleneck to improving the overall flotation system's capacity. Summary of the Invention

[0007] To address the aforementioned technical problems, this invention provides a method for regrinding and separating copper-nickel rough and concentrate ore using a combined milling and column grinding system.

[0008] To achieve the above objectives, the technical solution of the present invention is as follows: A method for regrinding and separating copper-nickel rough and concentrate from copper-nickel sulfide ore using a combined milling and column grinding system includes the following steps: S1, First-stage grinding: The raw ore is classified through a first-stage grinding process to control the grinding concentration at 70-75%. The overflow particle size of the first-stage grinding is -0.074μm, accounting for 60% or 63% respectively. S2, First stage roughing: The raw ore product obtained after first stage grinding and classification is mixed with water in a stirring tank to prepare slurry, the first reagent is added, and it is fed into a flotation machine for first stage roughing to obtain first stage roughing concentrate and first stage roughing tailings. S3. Regrinding of coarse concentrate: The concentrate from the first stage of roughing is conveyed to the classifier hydrocyclone of the regrinding ball mill for classification. The coarse sand enters the ball mill for regrinding, and the overflow of fine particles enters the next process for separation. The regrinding concentration is controlled at 65%±2%, and the fineness of the regrinding discharge is -0.074μm with a content of 80% or 84%. S4, First stage primary cleaning of the first four cells: The concentration of the overflow slurry from the regrinding and classification of the rough concentrate is controlled to 20%-22%, and fed into the flotation machine for primary cleaning to obtain the first four cells of primary cleaning concentrate and the first four cells of primary cleaning tailings. S5, 6th cell after primary cleaning: The tailings slurry from the first four cells of primary cleaning is fed into the flotation machine for primary cleaning in the last 6 cells, resulting in the concentrate from the last 6 cells of primary cleaning and the tailings from the last 6 cells of primary cleaning. S6, Primary secondary cleaning: The concentrate from the first primary cleaning in the 6 cells is fed into the flotation machine for primary secondary cleaning to obtain concentrate and tailings. The tailings are then fed into step S5 for primary primary cleaning. S7, First stage fine scavenging: The tailings from the first stage fine scavenging are fed into the flotation machine for first stage fine scavenging to obtain concentrate and tailings. The concentrate enters the S5 process, and the tailings are merged into the first stage roughing tailings to enter the second stage separation. S8. Two-stage grinding: The tailings from the first-stage roughing and the first-stage finishing are mixed and then ground and classified through two-stage grinding. The coarse sand is fed into a ball mill for regrinding, forming a closed-circuit grinding process. The overflow of fine particles is fed into the second-stage roughing for separation. The concentration of the second-stage grinding is controlled at 70%±2%, and the fineness of the second-stage grinding discharge is -0.074μm with a content of 85%. S9. Second-stage roughing: The overflow slurry from the second-stage grinding and classification is mixed with reagents and then fed into a flotation machine for second-stage roughing to obtain concentrate and tailings. S10, First 4 tanks of the second stage primary cleaning: The second stage roughing concentrate slurry, after adding reagents, is fed into the flotation machine for the second stage primary cleaning to obtain concentrate and tailings; S11, 6 cells after the second stage primary cleaning: The tailings slurry from the first 4 cells of the second stage primary cleaning is fed into the flotation machine for flotation in the last 6 cells of the second stage primary cleaning to obtain concentrate and tailings; S12, Secondary Cleaning: The concentrate slurry from the first stage of secondary cleaning in the 6 tanks is fed into a flotation machine after adding reagents to obtain concentrate and tailings; S13, Two-stage primary scavenging: The tailings slurry from the six tanks after the two-stage primary scavenging is fed into a flotation machine for two-stage primary scavenging to obtain concentrate and tailings. The scavenged concentrate and tailings are then fed into different flotation columns for separation. S14, Second-stage primary flotation column cleaning: The tailings from the second-stage secondary cleaning and the concentrate from the second-stage primary scavenging are mixed and fed into the first flotation column for enrichment to obtain concentrate and tailings. The tailings are then fed into step S11 for second-stage primary cleaning. S15, Second-stage scavenging: The tailings from the second-stage roughing are fed into the second flotation machine for scavenging to obtain first-stage concentrate and first-stage tailings; S16, Second-stage secondary scavenging: The tailings are fed into the second flotation machine for second-stage secondary scavenging to obtain second-stage secondary scavenging concentrate and second-stage secondary scavenging tailings T1; S17, Secondary flotation column refining: The concentrate from the primary scavenging stage and the concentrate from the secondary scavenging stage are combined and then enter the second flotation column for enrichment separation to obtain concentrate K2 and tailings. The tailings are then processed into step S9.

[0009] In step S2, the first reagent includes 160±10g / t butyl xanthate, 55±5g / t BQ622, 560±100g / t ammonium sulfate, 53±5g / t sodium hexametaphosphate, and 5±2g / t copper sulfate. Water is added to adjust the slurry concentration to 35%.

[0010] In step S9, the reagents include 70±10 g / t butyl xanthate, 330±10 g / t ammonium sulfate, 65 g / t±5 sodium hexametaphosphate, 10±2 g / t copper sulfate, and 6 g / t BQ-622. Water is added to adjust the slurry concentration to 30%.

[0011] In step S10, the reagent is sodium hexametaphosphate 14g / t.

[0012] In step S12, the reagent is sodium hexametaphosphate 28g / t.

[0013] The first flotation column has an aeration rate of 120-140 m³ / h and an aeration pressure of 200-400 kPa, and implements foam spraying with a spray water volume of 60-80 m³ / h, controlling the foam layer thickness to be 300-400 mm; the second flotation column has an aeration rate of 110-130 m³ / h and an aeration pressure of 200-400 kPa, and implements foam spraying with a spray water volume of 40-60 m³ / h, controlling the foam layer thickness to be 200-300 mm.

[0014] The beneficial effects of this invention are: This invention, combining the liberation characteristics of nickel-copper sulfide ore, utilizes a "rougher-finer regrinding process" and a "mid-ore flotation column separation process." After the first grinding stage, the valuable minerals and gangue minerals in the ore are not completely liberated but exist in the form of "intergrowths." During the roughing process, these intergrowths, due to their hydrophobic surface, will float to the rough concentrate with air bubbles. Through regrinding of the rough concentrate, these "intergrowths" are specifically finely ground, controlling the fineness of the regrinding to ensure complete liberation of the valuable minerals and gangue minerals within the intergrowths, creating optimal conditions for subsequent beneficiation operations. This process has the following advantages: 1. It avoids the huge energy consumption of grinding the entire raw ore into a fine powder, and only grinds a small amount of the coarse concentrate, thereby reducing system energy consumption and improving the liberation effect.

[0015] 2. Avoid deteriorating the flotation environment: Avoid grinding the raw ore too finely, which will cause some useful minerals that have already been liberated and are easily muddy to be over-ground, producing a large amount of "sludge", which will increase the consumption of reagents. Moreover, sludge will cover the surface of coarse-grained useful minerals, hindering their contact with air bubbles, reducing the floatability of useful minerals, and deteriorating the flotation environment for fine cleaning.

[0016] 3. Reduce impurities in concentrate: Fine mud is difficult to separate through foam and will enter the concentrate with the foam, reducing the quality of the concentrate and causing the magnesium oxide content in the concentrate to increase.

[0017] 4. Reduce metal loss: Improve the recovery of fine-grained valuable minerals, avoid the loss of large amounts of valuable metals with tailings, and improve the overall recovery rate of the system.

[0018] 5. The rough concentrate regrinding process employs "stage grinding and stage beneficiation." In the first stage of rough grinding, the goal is only to achieve a fineness sufficient to initially separate most of the intergrowths, protecting the liberated valuable minerals from over-grinding. Then, the rough concentrate rich in intergrowths is regrinded, with a clear objective, effectively reducing over-grinding throughout the entire process. Attached Figure Description

[0019] Figure 1 This is a process flow diagram of the present invention.

[0020] Figure 2 This is a flowchart of the traditional nickel-copper sulfide ore beneficiation process. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments. It should be understood that these descriptions are merely exemplary and not intended to limit the scope of the invention. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of the invention.

[0022] Example 1 The ore is a slurry sample from a nickel sulfide mine in Jinchuan. The original ore has a nickel grade of 1.34%, a copper grade of 1.21%, and a magnesium oxide grade of 25.22%. The main nickel-bearing mineral is pyrite, and the main gangue minerals are serpentine and olivine.

[0023] Reference Flowchart for Nickel-Copper Sulfide Ore Beneficiation Figure 1 The grinding process involves controlling the fineness of the first-stage grinding to 60% of the -200 mesh content, and the roughing pulp concentration to 35%. The first-stage roughing pulp uses 560 g / t ammonium sulfate to adjust the pH to 9. Then, reagents are added sequentially: 53 g / t sodium hexametaphosphate inhibitor, 5 g / t copper sulfate activator, 160 g / t butyl xanthate collector, and 55 g / t BQ-622 frother. This process yields rough concentrate and rough tailings. The rough concentrate from the first-stage roughing process is fed into a regrinding ball mill for further classification, with the regrinding fineness controlled at 80%. The overflow from the classification process enters the first-stage primary cleaning, the first-stage secondary cleaning, and the first-stage primary scavenging. The concentrate from the first four cells of the first-stage primary cleaning and the first-stage secondary cleaning are used as the high-grade final concentrate. The tailings from the first-stage primary scavenging and the first-stage roughing are combined and fed into the second-stage separation process.

[0024] The two-stage grinding fineness is -200 mesh with 85% content. The first-stage roughing pulp concentration is 30%. The second-stage roughing pulp pH is adjusted to 9 using 330 g / t ammonium sulfate. Then, 65 g / t sodium hexametaphosphate inhibitor, 10 g / t copper sulfate activator, 70 g / t butyl xanthate collector, and BQ-622 frother are added sequentially. Reagents are added at a rate of 6 g / t to obtain rough concentrate and rough tailings. The rough concentrate from the second stage roughing process enters the second stage primary cleaning, second stage secondary cleaning, and second stage primary scavenging process. Sodium hexametaphosphate (14 g / t) is added to the second stage primary cleaning, and sodium hexametaphosphate (28 g / t) is added as reagents to the second stage secondary cleaning. The tailings from the second stage secondary cleaning and the concentrate from the second stage primary scavenging are combined and then fed into the first microbubble flotation column for enrichment. The first flotation column has an aeration rate of 120-140 m³ / h and an aeration pressure of 200-400 kPa, and implements foam spraying with a water flow rate of 60-80 m³ / h, controlling the foam layer thickness to be 300-40 mm. 0mm; The concentrate from the first flotation column is combined into the final low-grade concentrate, and the tailings are returned to the second stage primary cleaning tank 6; the tailings from the second stage roughing stage are subjected to two scavenging processes, with butyl xanthate added at 96g per ton of raw ore. The scavenged concentrates from the two processes are then fed into the second flotation column for enrichment. The aeration rate of the second flotation column is 110-130m³ / h, the aeration pressure is 200-400KPa, and foam spraying is implemented with a spray water volume of 40-60m³ / h, controlling the foam layer thickness to be 200-300mm. The tailings from the second flotation column are returned to the second stage roughing stage, and the concentrates are combined into the final low-grade concentrate; the scavenged tailings are thickened as the final tailings and then stored in the tailings dam.

[0025] The main selection criteria in this embodiment are shown in Table 1. .

[0026] Table 1. Flotation Indicators for This Embodiment As can be seen from the data in Table 1, the total nickel recovery rate reached 86.63%, the copper recovery rate reached 81.99%, the high-refined magnesium oxide recovery rate was 5.34%, and the low-refined magnesium oxide recovery rate was 12.8% using the mineral processing method disclosed in this invention.

[0027] Example 2 The ore is a slurry sample from a nickel sulfide mine in Jinchuan. The original ore has a nickel grade of 1.36%, a copper grade of 1.22%, and a magnesium oxide grade of 24.13%. The main nickel-bearing mineral is pyrite, and the main gangue minerals are serpentine and olivine.

[0028] Reference Flowchart for Nickel-Copper Sulfide Ore Beneficiation Figure 1 The grinding process is controlled to achieve a -200 mesh content of 63% in the first stage of grinding and a roughing pulp concentration of 35%. The first-stage roughing pulp uses 560 g / t ammonium sulfate to adjust the pH to 9. Then, reagents are added sequentially: 53 g / t sodium hexametaphosphate inhibitor, 5 g / t copper sulfate activator, 160 g / t butyl xanthate collector, and 55 g / t BQ-622 frother. This process yields rough concentrate and rough tailings. The rough concentrate from the first stage is then regrinded and classified in a ball mill, with the regrinding fineness controlled at 80%. The overflow from the classification enters the first-stage primary cleaning, the first-stage secondary cleaning, and the first-stage primary scavenging. The concentrate from the first four cells of the first-stage primary cleaning and the first-stage secondary cleaning are used as the high-grade final concentrate. The tailings from the first-stage primary scavenging and the first-stage roughing are combined and enter the second-stage separation process.

[0029] The two-stage grinding fineness is -200 mesh with 85% content. The first-stage roughing pulp concentration is 30%. The second-stage roughing pulp pH is adjusted to 9 using 260g / t ammonium sulfate. Then, 70g / t sodium hexametaphosphate inhibitor, 9g / t copper sulfate activator, 60g / t butyl xanthate collector, and BQ-622 frother are added sequentially. Reagents are added at a rate of 6 g / t to obtain rough concentrate and rough tailings. The rough concentrate from the second stage roughing process enters the second stage primary cleaning, second stage secondary cleaning, and second stage primary scavenging process. Sodium hexametaphosphate (14 g / t) is added to the second stage primary cleaning, and sodium hexametaphosphate (28 g / t) is added as reagents to the second stage secondary cleaning. The tailings from the second stage secondary cleaning and the concentrate from the second stage primary scavenging are combined and then fed into the first microbubble flotation column for enrichment. The first flotation column has an aeration rate of 120-140 m³ / h and an aeration pressure of 200-400 kPa, and implements foam spraying with a water flow rate of 60-80 m³ / h, controlling the foam layer thickness to be 300-40 mm. 0mm; The concentrate from the first flotation column is combined into the final low-grade concentrate, and the tailings are returned to the second stage primary cleaning tank 6; the tailings from the second stage roughing stage are subjected to two scavenging processes, with butyl xanthate added at 96g per ton of raw ore. The scavenged concentrates from the two processes are then fed into the second flotation column for enrichment. The aeration rate of the second flotation column is 110-130m³ / h, the aeration pressure is 200-400KPa, and foam spraying is implemented with a spray water volume of 40-60m³ / h, controlling the foam layer thickness to be 200-300mm. The tailings from the second flotation column are returned to the second stage roughing stage, and the concentrates are combined into the final low-grade concentrate; the scavenged tailings are thickened as the final tailings and then stored in the tailings dam.

[0030] The main selection criteria in this embodiment are shown in Table 2. .

[0031] Table 2. Flotation index table for this embodiment. As can be seen from the data in Table 2, the total nickel recovery rate reached 87.21%, the copper recovery rate reached 82.79%, the high-refined magnesium oxide recovery rate was 5.68%, and the low-refined magnesium oxide recovery rate was 12.55% when the mineral processing method disclosed in this invention was used.

[0032] Example 3 The ore is a slurry sample from a nickel sulfide mine in Jinchuan. The original ore has a nickel grade of 1.41%, a copper grade of 1.25%, and a magnesium oxide grade of 25.87%. The main nickel-bearing mineral is pyrite, and the main gangue minerals are serpentine and olivine.

[0033] Reference Flowchart for Nickel-Copper Sulfide Ore Beneficiation Figure 1The grinding process involves controlling the fineness of the first-stage grinding to 63% of the -200 mesh content, and the roughing pulp concentration to 35%. The first-stage roughing pulp uses 560 g / t ammonium sulfate to adjust the pH to 9. Then, reagents are added sequentially: 53 g / t sodium hexametaphosphate inhibitor, 5 g / t copper sulfate activator, 160 g / t butyl xanthate collector, and 55 g / t BQ-622 frother. This process yields rough concentrate and rough tailings. The rough concentrate from the first-stage roughing process is fed into a regrinding ball mill for further re-grinding and classification, with the fineness controlled at 84%. The overflow from the classification enters the first-stage primary cleaning, the first-stage secondary cleaning, and the first-stage primary scavenging. The concentrate from the first four cells of the first-stage primary cleaning and the first-stage secondary cleaning are used as the high-grade final concentrate. The tailings from the first-stage primary scavenging and the first-stage roughing are combined and fed into the second-stage separation process.

[0034] The two-stage grinding fineness is -200 mesh with 85% content. The first-stage roughing pulp concentration is 30%. The second-stage roughing pulp pH is adjusted to 9 using 260g / t ammonium sulfate. Then, 70g / t sodium hexametaphosphate inhibitor, 9g / t copper sulfate activator, 60g / t butyl xanthate collector, and BQ-622 frother are added sequentially. Reagents are added at a rate of 6 g / t to obtain rough concentrate and rough tailings. The rough concentrate from the second stage roughing process enters the second stage primary cleaning, second stage secondary cleaning, and second stage primary scavenging process. Sodium hexametaphosphate (14 g / t) is added to the second stage primary cleaning, and sodium hexametaphosphate (28 g / t) is added as reagents to the second stage secondary cleaning. The tailings from the second stage secondary cleaning and the concentrate from the second stage primary scavenging are combined and then fed into the first microbubble flotation column for enrichment. The first flotation column has an aeration rate of 120-140 m³ / h and an aeration pressure of 200-400 kPa, and implements foam spraying with a water flow rate of 60-80 m³ / h, controlling the foam layer thickness to be 300-40 mm. 0mm; The concentrate from the first flotation column is combined into the final low-grade concentrate, and the tailings are returned to the second stage primary cleaning tank 6; the tailings from the second stage roughing stage are subjected to two scavenging processes, with butyl xanthate added at 96g per ton of raw ore. The scavenged concentrates from the two processes are then fed into the second flotation column for enrichment. The aeration rate of the second flotation column is 110-130m³ / h, the aeration pressure is 200-400KPa, and foam spraying is implemented with a spray water volume of 40-60m³ / h, controlling the foam layer thickness to be 200-300mm. The tailings from the second flotation column are returned to the second stage roughing stage, and the concentrates are combined into the final low-grade concentrate; the scavenged tailings are thickened as the final tailings and then stored in the tailings dam.

[0035] The main selection criteria in this embodiment are shown in Table 2. .

[0036] Table 3 Flotation index table for this embodiment As can be seen from the data in Table 3, the total nickel recovery rate reached 87.10%, the copper recovery rate reached 83.35%, the high-refined magnesium oxide recovery rate was 5.73%, and the low-refined magnesium oxide recovery rate was 11.88% when the mineral processing method disclosed in this invention was adopted.

[0037] Comparative Example 1: The comparative experiment used the same raw ore as Implementation Scheme 3, and the reagent regime remained unchanged. The process flow adopted the traditional nickel-copper sulfide ore beneficiation process, as shown in the attached diagram. Figure 2 .

[0038] The first-stage grinding process employs two grinding stages, controlling the fineness of the first-stage secondary grinding to 67% of the -200 mesh content. The first-stage roughing pulp concentration is 35%. The pH of the pulp in the first-stage roughing process is adjusted to 9 using 260 g / t ammonium sulfate. Then, reagents are added sequentially in the following formulation: 70 g / t sodium hexametaphosphate inhibitor, 9 g / t copper sulfate activator, 60 g / t butyl xanthate collector, and 6 g / t BQ-622 frother. This process yields rough concentrate and rough tailings. The first-stage roughing concentrate enters the first-stage primary cleaning, the first-stage secondary cleaning, and the first-stage primary scavenging. The concentrate from the first-stage primary cleaning and the first-stage secondary cleaning are used as the high-grade final concentrate. The tailings from the first-stage primary scavenging and the first-stage roughing tailings are combined and enter the second-stage separation process.

[0039] The second-stage grinding fineness is 83% -200 mesh content. The first-stage roughing pulp concentration is 30%. The second-stage roughing uses 260g / t ammonium sulfate to adjust the pulp pH to 9. Then, reagents are added sequentially: 70g / t sodium hexametaphosphate inhibitor, 9g / t copper sulfate activator, 60g / t butyl xanthate collector, and 6g / t BQ-622 frother, to obtain rough concentrate and rough tailings. The second-stage roughing concentrate enters the second-stage primary cleaning, second-stage secondary cleaning, and second-stage primary scavenging. In the second-stage primary cleaning, 14g / t sodium hexametaphosphate is added, and in the second-stage secondary cleaning, 28g / t sodium hexametaphosphate is added as reagents. The second-stage roughing tailings undergo two scavenging processes, with 96g butyl xanthate added per ton of raw ore. The scavenged concentrate enters the second-stage primary cleaning process. The tailings are concentrated and then stored in the tailings dam.

[0040] The main selection criteria in this embodiment are shown in Table 2. .

[0041] Table 4. Flotation Indicators for This Embodiment A comparison of the data in Tables 3 and 4 shows that after adopting this process, the total refined nickel recovery rate increased by 1.76%, the copper recovery rate increased by 0.69%, the high-refined magnesium oxide content decreased by 1.11%, and the low-refined magnesium oxide content decreased by 1.92%.

[0042] It should be understood that the specific embodiments described above are merely illustrative or explanatory of the principles of the invention and do not constitute a limitation thereof. Therefore, any modifications, equivalent substitutions, improvements, etc., made without departing from the spirit and scope of the invention should be included within the protection scope of the invention. Furthermore, the appended claims are intended to cover all variations and modifications falling within the scope and boundaries of the appended claims, or equivalent forms of such scope and boundaries.

Claims

1. A method for regrinding and separating copper-nickel rough and concentrate from copper-nickel sulfide ore using a combined milling and column milling system, characterized in that, Includes the following steps: S1, First-stage grinding: The raw ore is classified through a first-stage grinding process to control the grinding concentration at 70-75%. The overflow particle size of the first-stage grinding is -0.074μm, accounting for 60% or 63% respectively. S2, First stage roughing: The raw ore product obtained after first stage grinding and classification is mixed with water in a stirring tank to prepare slurry, the first reagent is added, and it is fed into a flotation machine for first stage roughing to obtain first stage roughing concentrate and first stage roughing tailings. S3. Regrinding of coarse concentrate: The concentrate from the first stage of roughing is conveyed to the classifier hydrocyclone of the regrinding ball mill for classification. The coarse sand enters the ball mill for regrinding, and the overflow of fine particles enters the next process for separation. The regrinding concentration is controlled at 65%±2%, and the fineness of the regrinding discharge is -0.074μm with a content of 80% or 84%. S4, First stage primary cleaning of the first four cells: The concentration of the overflow slurry from the regrinding and classification of the rough concentrate is controlled to 20%-22%, and fed into the flotation machine for primary cleaning to obtain the first four cells of primary cleaning concentrate and the first four cells of primary cleaning tailings. S5, 6th cell after primary cleaning: The tailings slurry from the first four cells of primary cleaning is fed into the flotation machine for primary cleaning in the last 6 cells, resulting in the concentrate from the last 6 cells of primary cleaning and the tailings from the last 6 cells of primary cleaning. S6, Primary secondary cleaning: The concentrate from the first primary cleaning in the 6 cells is fed into the flotation machine for primary secondary cleaning to obtain concentrate and tailings. The tailings are then fed into step S5 for primary primary cleaning. S7, First stage fine scavenging: The tailings from the first stage fine scavenging are fed into the flotation machine for first stage fine scavenging to obtain concentrate and tailings. The concentrate enters the S5 process, and the tailings are merged into the first stage roughing tailings to enter the second stage separation. S8. Two-stage grinding: The tailings from the first-stage roughing and the first-stage finishing are mixed and then ground and classified through two-stage grinding. The coarse sand is fed into a ball mill for regrinding, forming a closed-circuit grinding process. The overflow of fine particles is fed into the second-stage roughing for separation. The concentration of the second-stage grinding is controlled at 70%±2%, and the fineness of the second-stage grinding discharge is -0.074μm with a content of 85%. S9. Second-stage roughing: The overflow slurry from the second-stage grinding and classification is mixed with reagents and then fed into a flotation machine for second-stage roughing to obtain concentrate and tailings. S10, First 4 tanks of the second stage primary cleaning: The second stage roughing concentrate slurry, after adding reagents, is fed into the flotation machine for the second stage primary cleaning to obtain concentrate and tailings; S11, 6 cells after the second stage primary cleaning: The tailings slurry from the first 4 cells of the second stage primary cleaning is fed into the flotation machine for flotation in the last 6 cells of the second stage primary cleaning to obtain concentrate and tailings; S12, Secondary Cleaning: The concentrate slurry from the first stage of secondary cleaning in the 6 tanks is fed into a flotation machine after adding reagents to obtain concentrate and tailings; S13, Two-stage primary scavenging: The tailings slurry from the six tanks after the two-stage primary scavenging is fed into a flotation machine for two-stage primary scavenging to obtain concentrate and tailings. The scavenged concentrate and tailings are then fed into different flotation columns for separation. S14, Second-stage primary flotation column cleaning: The tailings from the second-stage secondary cleaning and the concentrate from the second-stage primary scavenging are mixed and fed into the first flotation column for enrichment to obtain concentrate and tailings. The tailings are then fed into step S11 for second-stage primary cleaning. S15, Second-stage scavenging: The tailings from the second-stage roughing are fed into the second flotation machine for scavenging to obtain first-stage concentrate and first-stage tailings; S16, Second-stage secondary scavenging: The tailings are fed into the second flotation machine for second-stage secondary scavenging to obtain second-stage secondary scavenging concentrate and second-stage secondary scavenging tailings T1; S17, Secondary flotation column refining: The concentrate from the primary scavenging stage and the concentrate from the secondary scavenging stage are combined and then enter the second flotation column for enrichment separation to obtain concentrate K2 and tailings. The tailings are then processed into step S9.

2. The method for regrinding and separating copper-nickel rough and concentrate using a combined milling and column milling system according to claim 1, characterized in that, In step S2, the first reagent includes 160±10g / t butyl xanthate, 55±5g / t BQ622, 560±100g / t ammonium sulfate, 53±5g / t sodium hexametaphosphate, and 5±2g / t copper sulfate. Water is added to adjust the slurry concentration to 35%.

3. The method for regrinding and separating copper-nickel rough and concentrate using a combined milling and column milling system according to claim 1, characterized in that, In step S9, the reagents include butyl xanthate 70±10g / t, ammonium sulfate 330±10g / t, sodium hexametaphosphate 65g / t±5, copper sulfate 10±2g / t, and BQ-622 6g / t. Water is added to adjust the slurry concentration to 30%.

4. The method for regrinding and separating copper-nickel rough and concentrate using a combined milling and column milling system according to claim 1, characterized in that, In step S10, the reagent is sodium hexametaphosphate 14g / t.

5. The method for regrinding and separating copper-nickel rough and concentrate using a combined milling and column milling system according to claim 1, characterized in that, In step S12, the reagent is sodium hexametaphosphate 28g / t.

6. The method for regrinding and separating copper-nickel rough and concentrate using a combined milling and column milling system according to claim 1, characterized in that, The first flotation column has an aeration rate of 120-140 m³ / h and an aeration pressure of 200-400 kPa, and implements foam spraying with a spray water volume of 60-80 m³ / h, controlling the foam layer thickness to be 300-400 mm; the second flotation column has an aeration rate of 110-130 m³ / h and an aeration pressure of 200-400 kPa, and implements foam spraying with a spray water volume of 40-60 m³ / h, controlling the foam layer thickness to be 200-300 mm.

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