A process for reducing the content of serpentine in copper nickel sulphide concentrate

Abstract

This invention discloses a process for reducing the serpentine content in copper-nickel sulfide ore concentrate, comprising the following steps: Step 1, grinding the copper-nickel sulfide ore; Step 2, performing a first copper-nickel mixed roughing flotation on the slurry prepared in Step 1; Step 3, adding an inhibitor to the copper-nickel mixed rough concentrate I obtained in Step 2 for a second cleaning process; Step 4, combining the tailings obtained in Step 2 and the underflow obtained in the first cleaning process in Step 3 and grinding them again; Step 5, performing a second copper-nickel mixed roughing flotation on the slurry obtained in Step 4; Step 6, performing a second scavenging on the tailings obtained in Step 5; Step 7, adding an inhibitor to the copper-nickel mixed rough concentrate II obtained in Step 5 for a second cleaning process. This invention uses sodium carboxymethyl cellulose or a mixture of sodium carboxymethyl cellulose and sodium alginate as an inhibitor, effectively reducing the magnesium oxide content in the concentrate, reducing mechanical entrainment, and improving the quality of copper-nickel mixed concentrate I and copper-nickel mixed concentrate II.

Description

Technical Field

[0001] This invention relates to the field of mineral processing technology, specifically a process for reducing the serpentine content in copper-nickel sulfide ore concentrate. Background Technology

[0002] With the continuous development of nickel ore resources, rich ore resources are becoming increasingly scarce, and low-grade lean ore will be the main source of nickel resources in the future. Low-grade copper-nickel sulfide ores contain a large amount of serpentine, and the pyrite and serpentine are finely intergrown and have complex symbiotic relationships. Since the flotation pH of copper-nickel sulfide ores is approximately 9–9.5, at which point the pyrite surface is negatively charged while the serpentine surface is positively charged. Due to electrostatic effects, fine serpentine particles are adsorbed onto the pyrite surface, forming heterogeneous agglomeration, which consumes a large amount of collector. Furthermore, serpentine is brittle and porous, easily over-crushed and muddy. These fine-grained serpentine particles are easily carried into the concentrate by air bubbles, resulting in a decrease in the quality of the concentrate after flotation and a low recovery rate. Summary of the Invention

[0003] The purpose of this invention is to provide a process for reducing the serpentine content in copper-nickel sulfide ore concentrate. Using copper-nickel ore as the flotation target, sodium carboxymethyl cellulose is added to disperse fine-grained serpentine, and sodium alginate is added to form large-sized flocs of fine-grained serpentine, causing the serpentine on the surface of nickel pyrite to fall off, thereby reducing the serpentine content in the flotation concentrate product and improving the quality of the concentrate after flotation.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0005] A process for reducing the serpentine content in copper-nickel sulfide ore concentrate includes the following steps:

[0006] Step 1: Grind the copper-nickel sulfide ore until the mass percentage of ore particles with a fineness of -200 mesh in the slurry is 68%.

[0007] Step 2: The slurry prepared in Step 1 is subjected to a copper-nickel mixed roughing flotation. Ammonium sulfate is added to the slurry at a ratio of 500g / t of slurry mass for 2 minutes, and a collector is added for 2 minutes. The pH of the slurry is adjusted to 7-9, and the roughing is carried out for 8-12 minutes to obtain copper-nickel mixed rough concentrate I.

[0008] Step 3: Add inhibitors to the copper-nickel mixed crude concentrate I obtained in Step 2 and perform two cleaning processes to adjust the pH of the slurry to 7-9. The added inhibitors are sodium carboxymethyl cellulose or a mixture of sodium carboxymethyl cellulose and sodium alginate. After cleaning, copper-nickel mixed concentrate I is obtained.

[0009] Step 4: Combine the tailings obtained in Step 2 and the underflow obtained in Step 3 through primary beneficiation and grind them again. The mass percentage of ore particles with a fineness of -200 mesh to -400 mesh in the slurry should be 85%.

[0010] Step 5: Perform secondary copper-nickel mixed roughing flotation on the slurry obtained in Step 4. Add inhibitor to the slurry for 2 minutes and then add collector. Adjust the pH of the slurry to 7-9 and float for 6 minutes to obtain copper-nickel mixed rough concentrate II and tailings.

[0011] Step 6: Perform two scavenging processes on the tailings obtained in Step 5. During each scavenging process, add ethyl xanthate at a ratio of 10-20 g / t of tailings mass and butyl ammonium black at a ratio of 2 g / t of tailings mass to adjust the pH of the slurry to 7-9.

[0012] Step 7: Add inhibitors to the copper-nickel mixed rough concentrate II obtained in step 5 and perform two cleaning processes to adjust the pH of the pulp to 7-9. After cleaning, copper-nickel mixed concentrate II is obtained.

[0013] The obtained copper-nickel mixed concentrate I and copper-nickel mixed concentrate II are collected as the final products of this process.

[0014] Preferably, the collectors added in step two are ethyl xanthate and butyl ammonium black powder, with ethyl xanthate added at a ratio of 100-140 g / t of slurry mass and butyl ammonium black powder added at a ratio of 14 g / t of slurry mass.

[0015] Preferably, the collectors added in step five are ethyl xanthate and butyl ammonium black powder, with ethyl xanthate added at a ratio of 100-140 g / t of slurry mass and butyl ammonium black powder added at a ratio of 14 g / t of slurry mass.

[0016] Preferably, the inhibitor added in steps three, five, and seven is sodium carboxymethyl cellulose or a mixture of sodium carboxymethyl cellulose and sodium alginate; sodium carboxymethyl cellulose is added at a ratio of 0-500 g / t of slurry mass, and sodium alginate is added at a ratio of 50-500 g / t of slurry mass.

[0017] Preferably, when the inhibitor is a mixture of sodium carboxymethyl cellulose and sodium alginate, sodium carboxymethyl cellulose is added first and acted on for 3 minutes, followed by sodium alginate and acted on for 3 minutes.

[0018] This invention uses sodium carboxymethyl cellulose or a mixture of sodium carboxymethyl cellulose and sodium alginate as an inhibitor. Sodium carboxymethyl cellulose disperses fine-grained serpentine and pyrite, while the addition of sodium alginate causes fine-grained serpentine to flocculate into large-sized aggregates. This effectively reduces the magnesium oxide content in the concentrate, reduces mechanical entrainment, and improves the quality of copper-nickel mixed concentrate I and copper-nickel mixed concentrate II.

[0019] The inhibitor used in this invention, sodium carboxymethyl cellulose, is a carboxymethylated derivative of cellulose. It is an ionic cellulose gum, odorless, tasteless, hygroscopic, and easily dispersed in water to form a transparent colloidal solution. Sodium alginate is a byproduct of extracting iodine and mannitol from brown algae such as kelp or Sargassum. It is used as a thickener, stabilizer, and emulsifier in food. It has low environmental pollution and a significant inhibitory effect on serpentine magnesium silicate minerals. Attached Figure Description

[0020] Figure 1 This is the process flow diagram described in Example 1;

[0021] Figure 2 This is a process flow diagram as described in Comparative Example 1;

[0022] Figure 3 This is the process flow diagram described in Example 2;

[0023] Figure 4 This is the process flow diagram described in Example 3;

[0024] Figure 5 This is the process flow diagram described in Example 4;

[0025] Figure 6 This is the process flow diagram described in Comparative Example 4. Detailed Implementation

[0026] The present invention will now be described in further detail with reference to specific embodiments and accompanying drawings.

[0027] Example 1

[0028] The main metallic sulfides in a certain copper-nickel sulfide ore are pyrite, pyrrhotite, ferruginous pyrrhotite, chalcopyrite / cubic chalcopyrite. Pyrite accounts for 2.72% of the total mass, pyrrhotite 1.91%, ferruginous pyrrhotite 1.25%, ferruginous pyrrhotite 0.45%, and chalcopyrite / cubic chalcopyrite 0.94%. The gangue mineral is mainly serpentine, accounting for 18.03% of the total mass. The original ore has a nickel grade of 0.67%, a copper grade of 0.30%, and a magnesium oxide content of 26.80%.

[0029] like Figure 1 The process for reducing the serpentine content in copper-nickel sulfide ore concentrate, as shown, includes the following steps:

[0030] Step 1: Grind the copper-nickel sulfide ore until the mass percentage of ore particles with a fineness of -200 mesh in the slurry is 68%.

[0031] Step 2: The pulp prepared in Step 1 is subjected to a copper-nickel mixed roughing flotation. Ammonium sulfate is added to the pulp at a ratio of 500 g / t of pulp mass and reacted for 2 min. Then, ethyl xanthate is added at a ratio of 100 g / t of pulp mass and butyl ammonium black powder at a ratio of 14 g / t of pulp mass and reacted for 2 min. The pH of the pulp is adjusted to 7. Roughing is carried out for 8 min to obtain copper-nickel mixed rough concentrate I and roughing tailings I.

[0032] Step 3: Add sodium carboxymethyl cellulose to the copper-nickel mixed rough concentrate I obtained in Step 2 at a ratio of 50 g / t of slurry mass. After 3 minutes, add sodium alginate at a ratio of 50 g / t of slurry mass and act for another 3 minutes. Adjust the pH of the slurry to 7 and perform a first cleaning process for 6 minutes. Then, add sodium carboxymethyl cellulose to the obtained concentrate slurry at a ratio of 35 g / t of concentrate slurry mass. After 3 minutes, add sodium alginate at a ratio of 35 g / t of concentrate slurry mass and act for another 3 minutes. Adjust the pH of the slurry to 7 and perform a second cleaning process for 4 minutes. After cleaning, copper-nickel mixed concentrate I and middlings I are obtained.

[0033] Step 4: Combine the roughing tailings I obtained in Step 2 and the underflow obtained in Step 3 (first cleaning) and grind them again. The mass percentage of ore particles with a fineness of -200 mesh in the slurry should be 85%.

[0034] Step 5: Add sodium carboxymethyl cellulose to the slurry obtained in Step 4 at a ratio of 100 g / t of slurry mass, and after 3 min, add sodium alginate at a ratio of 100 g / t of slurry mass and act for 3 min. Then add ethyl xanthate at a ratio of 45 g / t of slurry mass and butyl ammonium black at a ratio of 4 g / t of slurry mass and act for 2 min. Adjust the pH of the slurry to 7 and perform a secondary copper-nickel mixed roughing flotation for 6 min to obtain copper-nickel mixed rough concentrate II and roughing tailings II.

[0035] Step 6: Perform 2-3 scavenging processes on the roughing tailings II obtained in Step 5. Add ethyl xanthate at a ratio of 20 g / t of tailings mass and butyl ammonium black powder at a ratio of 2 g / t of tailings mass for the first scavenging process. Then add ethyl xanthate at a ratio of 20 g / t of tailings mass for the second scavenging process to obtain middlings IV and tailings. The pH value of the pulp should be 7 during both scavenging processes.

[0036] Step 7: In the copper-nickel mixed crude concentrate II obtained in Step 5, add sodium carboxymethyl cellulose at a ratio of 50 g / t of slurry mass for 3 minutes, then add sodium alginate at a ratio of 50 g / t of slurry mass for 3 minutes, adjust the pH of the slurry to 7, and then refine for 5 minutes to obtain refined slurry and middlings III; In the obtained refined slurry, add sodium carboxymethyl cellulose at a ratio of 35 g / t of refined slurry mass for 3 minutes, then add sodium alginate at a ratio of 35 g / t of refined slurry mass for 3 minutes, adjust the pH of the slurry to 7, and refine again for 4 minutes to obtain copper-nickel mixed concentrate II and middlings II;

[0037] The obtained copper-nickel mixed concentrate I and copper-nickel mixed concentrate II were collected as the final products of this process. The yields of copper-nickel mixed concentrate I and copper-nickel mixed concentrate II obtained in this embodiment, the grades of Ni, Cu and MgO in the concentrates, and the recovery rates of Ni and Cu are shown in Table 1.

[0038] Comparative Example 1

[0039] like Figure 2 The conventional flotation process for copper-nickel sulfide ore concentrate shown is based on a process for reducing the serpentine content in copper-nickel sulfide ore concentrate as described in Example 1. No depressants are added during flotation in steps three, five, and seven. The resulting copper-nickel mixed concentrate I and copper-nickel mixed concentrate II are collected as the final products of Comparative Example 1. The yields of copper-nickel mixed concentrate I and copper-nickel mixed concentrate II obtained in Comparative Example 1, the grades of Ni, Cu, and MgO in the concentrates, and the recoveries of Ni and Cu are shown in Table 1.

[0040] Table 1

[0041]

[0042] As shown in Table 1, the product obtained in Example 1 exhibits significantly better performance in all aspects compared to the traditional flotation process described in Comparative Example 1. Therefore, compared to the traditional process, the process of this invention significantly reduces the serpentine content in the concentrate, demonstrating significant advantages.

[0043] Example 2

[0044] The main metallic sulfides in a copper-nickel sulfide ore in Northwest China include pyrite, pyrrhotite, ferruginous pyrrhotite, chalcopyrite / cubic chalcopyrite. Pyrite accounts for 2.72% of the total content, pyrrhotite 1.91%, ferruginous pyrrhotite 1.25%, ferruginous pyrrhotite 0.45%, and chalcopyrite / cubic chalcopyrite 0.94%. The gangue mineral is mainly serpentine, accounting for 18.03% of the total content. The original ore has a nickel grade of 0.67%, a copper grade of 0.30%, and a magnesium oxide content of 26.80%.

[0045] like Figure 3 The process for reducing the serpentine content in copper-nickel sulfide ore concentrate, as shown, includes the following steps:

[0046] Step 1: Grind the copper-nickel sulfide ore until the mass percentage of ore particles with a fineness of -200 mesh in the slurry is 68%.

[0047] Step 2: The pulp prepared in Step 1 is subjected to a copper-nickel mixed roughing flotation. Ammonium sulfate is added to the pulp at a ratio of 500 g / t of pulp mass and reacted for 2 min. Then, ethyl xanthate is added at a ratio of 100 g / t of pulp mass and butyl ammonium black powder at a ratio of 14 g / t of pulp mass and reacted for 2 min. The pH of the pulp is adjusted to 7. Roughing is carried out for 8 min to obtain copper-nickel mixed rough concentrate I and roughing tailings I.

[0048] Step 3: Add sodium carboxymethyl cellulose to the copper-nickel mixed rough concentrate I obtained in Step 2 at a ratio of 100 g / t of slurry mass for 3 minutes, then add sodium alginate at a ratio of 25 g / t of slurry mass for 3 minutes, adjust the pH of the slurry to 7, and perform a first cleaning process for 6 minutes. Then, add sodium carboxymethyl cellulose to the obtained concentrate slurry at a ratio of 50 g / t of concentrate slurry mass for 3 minutes, then add sodium alginate at a ratio of 25 g / t of concentrate slurry mass for 3 minutes, adjust the pH of the slurry to 7, and perform a second cleaning process for 4 minutes. After cleaning, copper-nickel mixed concentrate I and middlings I are obtained.

[0049] Step 4: Combine the roughing tailings I obtained in Step 2 and the underflow obtained in Step 3 (first cleaning) and grind them again. The mass percentage of ore particles with a fineness of -200 mesh in the slurry should be 85%.

[0050] Step 5: Add sodium carboxymethyl cellulose to the slurry obtained in Step 4 at a ratio of 500 g / t of slurry mass, and after 3 min, add sodium alginate at a ratio of 50 g / t of slurry mass and act for 3 min. Then add ethyl xanthate at a ratio of 45 g / t of slurry mass and butyl ammonium black at a ratio of 4 g / t of slurry mass and act for 2 min. Adjust the pH of the slurry to 7 and perform a secondary copper-nickel mixed roughing flotation for 6 min to obtain copper-nickel mixed rough concentrate II and roughing tailings II.

[0051] Step 6: Perform 2-3 scavenging processes on the roughing tailings II obtained in Step 5. Add ethyl xanthate at a ratio of 20 g / t of tailings mass and butyl ammonium black powder at a ratio of 2 g / t of tailings mass for the first scavenging process. Then add ethyl xanthate at a ratio of 20 g / t of tailings mass for the second scavenging process to obtain middlings IV and tailings. The pH value of the pulp should be 7 during both scavenging processes.

[0052] Step 7: In the copper-nickel mixed crude concentrate II obtained in Step 5, add sodium carboxymethyl cellulose at a ratio of 100 g / t of slurry mass for 3 minutes, then add sodium alginate at a ratio of 25 g / t of slurry mass for 3 minutes. Adjust the pH of the slurry to 7, and then refine for 5 minutes to obtain refined slurry and middlings III. In the obtained refined slurry, add sodium carboxymethyl cellulose at a ratio of 50 g / t of refined slurry mass for 3 minutes, then add sodium alginate at a ratio of 25 g / t of refined slurry mass for 3 minutes. Adjust the pH of the slurry to 7, and then refine again for 4 minutes to obtain copper-nickel mixed concentrate II and middlings II.

[0053] The obtained copper-nickel mixed concentrate I and copper-nickel mixed concentrate II were collected as the final products of this process. The yields of copper-nickel mixed concentrate I and copper-nickel mixed concentrate II obtained in this embodiment, the grades of Ni, Cu and MgO in the concentrates, and the recovery rates of Ni and Cu are shown in Table 2.

[0054] Table 2

[0055]

[0056] Example 3

[0057] The main metallic sulfides in a copper-nickel sulfide ore in Northwest China include pyrite, pyrrhotite, ferruginous pyrrhotite, chalcopyrite / cubic chalcopyrite. Pyrite accounts for 2.72% of the total content, pyrrhotite 1.91%, ferruginous pyrrhotite 1.25%, ferruginous pyrrhotite 0.45%, and chalcopyrite / cubic chalcopyrite 0.94%. The gangue mineral is mainly serpentine, accounting for 18.03% of the total content. The original ore has a nickel grade of 0.67%, a copper grade of 0.30%, and a magnesium oxide content of 26.80%.

[0058] like Figure 4 The process for reducing the serpentine content in copper-nickel sulfide ore concentrate, as shown, includes the following steps:

[0059] Step 1: Grind the copper-nickel sulfide ore until the mass percentage of ore particles with a fineness of -200 mesh in the slurry is 68%.

[0060] Step 2: The pulp prepared in Step 1 is subjected to a copper-nickel mixed roughing flotation. Ammonium sulfate is added to the pulp at a ratio of 500 g / t of pulp mass and reacted for 2 min. Then, ethyl xanthate is added at a ratio of 100 g / t of pulp mass and butyl ammonium black powder at a ratio of 14 g / t of pulp mass and reacted for 2 min. The pH of the pulp is adjusted to 7. Roughing is carried out for 8 min to obtain copper-nickel mixed rough concentrate I and roughing tailings I.

[0061] Step 3: Add sodium alginate to the copper-nickel mixed rough concentrate I obtained in Step 2 at a ratio of 150 g / t of slurry mass for 3 minutes, adjust the pH of the slurry to 7, and perform a first cleaning process for 6 minutes; then add sodium alginate to the obtained concentrate slurry at a ratio of 100 g / t of concentrate slurry mass for 3 minutes, adjust the pH of the slurry to 7, and perform a second cleaning process for 4 minutes; after cleaning, copper-nickel mixed concentrate I and middlings I are obtained;

[0062] Step 4: Combine the roughing tailings I obtained in Step 2 and the underflow obtained in Step 3 (first cleaning) and grind them again. The mass percentage of ore particles with a fineness of -200 mesh in the slurry should be 85%.

[0063] Step 5: Add sodium alginate to the slurry obtained in Step 4 at a ratio of 500 g / t of slurry mass and act for 3 min. Then add ethyl xanthate at a ratio of 45 g / t of slurry mass and butyl ammonium black at a ratio of 4 g / t of slurry mass and act for 2 min. Adjust the pH of the slurry to 7 and perform a secondary copper-nickel mixed roughing flotation for 6 min to obtain copper-nickel mixed rough concentrate II and roughing tailings II.

[0064] Step 6: Perform 2-3 scavenging processes on the roughing tailings II obtained in Step 5. Add ethyl xanthate at a ratio of 20 g / t of tailings mass and butyl ammonium black powder at a ratio of 2 g / t of tailings mass for the first scavenging process. Then add ethyl xanthate at a ratio of 20 g / t of tailings mass for the second scavenging process to obtain middlings IV and tailings. The pH value of the pulp should be 7 during both scavenging processes.

[0065] Step 7: In the copper-nickel mixed rough concentrate II obtained in Step 5, add sodium alginate at a ratio of 150 g / t of slurry mass for 3 min, adjust the pH of the slurry to 7, and then refine for 5 min to obtain refined slurry and middlings III; in the obtained refined slurry, add sodium alginate at a ratio of 100 g / t of refined slurry mass for 3 min, adjust the pH of the slurry to 7, and then refine again for 4 min to obtain copper-nickel mixed concentrate II and middlings II;

[0066] The obtained copper-nickel mixed concentrate I and copper-nickel mixed concentrate II were collected as the final products of this process. The yields of copper-nickel mixed concentrate I and copper-nickel mixed concentrate II obtained in this embodiment, the grades of Ni, Cu and MgO in the concentrates, and the recovery rates of Ni and Cu are shown in Table 3.

[0067] Table 3

[0068]

[0069] Example 4

[0070] The main metallic sulfides in a copper-nickel sulfide ore in Northwest China include pyrite, pyrrhotite, ferruginous pyrrhotite, sulphite, and chalcopyrite / cubic chalcopyrite. Pyrite accounts for 2.68% of the total content, pyrrhotite 1.84%, ferruginous pyrrhotite 1.65%, sulphite 0.48%, and chalcopyrite 0.98%. The gangue mineral is mainly serpentine, accounting for 17.63% of the total content. The original ore has a nickel grade of 0.84%, a copper grade of 0.47%, and a magnesium oxide content of 26.27%.

[0071] like Figure 5 The process for reducing the serpentine content in copper-nickel sulfide ore concentrate, as shown, includes the following steps:

[0072] Step 1: Grind the copper-nickel sulfide ore until the mass percentage of ore particles with a fineness of -200 mesh in the slurry is 68%.

[0073] Step 2: Perform a copper-nickel mixed roughing flotation on the slurry prepared in Step 1. Add ammonium sulfate to the slurry at a ratio of 500 g / t of slurry mass and act for 2 min. Then add ethyl xanthate at a ratio of 140 g / t of slurry mass and butyl ammonium black at a ratio of 14 g / t of slurry mass and act for 2 min. Adjust the pH of the slurry to 9 and rough for 12 min to obtain copper-nickel mixed rough concentrate I and roughing tailings I.

[0074] Step 3: Add sodium carboxymethyl cellulose to the copper-nickel mixed rough concentrate I obtained in Step 2 at a ratio of 50 g / t of slurry mass. After 3 minutes, add sodium alginate at a ratio of 50 g / t of slurry mass and act for another 3 minutes to adjust the pH of the slurry to 9. Perform a first cleaning process for 6 minutes. Then, add sodium carboxymethyl cellulose to the obtained concentrate slurry at a ratio of 35 g / t of concentrate slurry mass. After 3 minutes, add sodium alginate at a ratio of 35 g / t of concentrate slurry mass and act for another 3 minutes to adjust the pH of the slurry to 9. Perform a second cleaning process for 4 minutes. After cleaning, copper-nickel mixed concentrate I and middlings I are obtained.

[0075] Step 4: Combine the roughing tailings I obtained in Step 2 and the underflow obtained in Step 3 (first cleaning) and grind them again. The mass percentage of ore particles with a fineness of -400 mesh in the slurry should be 85%.

[0076] Step 5: Add sodium carboxymethyl cellulose to the slurry obtained in Step 4 at a ratio of 100 g / t of slurry mass, and after 3 min, add sodium alginate at a ratio of 100 g / t of slurry mass and act for 3 min. Then add ethyl xanthate at a ratio of 80 g / t of slurry mass and butyl ammonium black at a ratio of 4 g / t of slurry mass and act for 2 min. Adjust the pH of the slurry to 9 and perform a secondary copper-nickel mixed roughing flotation for 8 min to obtain copper-nickel mixed rough concentrate II and roughing tailings II.

[0077] Step Six: Perform two scavenging processes on the roughing tailings II obtained in Step Five. Add ethyl xanthate at a ratio of 20 g / t of tailings mass and butyl ammonium black powder at a ratio of 2 g / t of tailings mass for the first scavenging process. Then, add ethyl xanthate at a ratio of 10 g / t of tailings mass for the second scavenging process to obtain middlings IV, middlings V, and tailings. The pH value of the pulp is 9 during both scavenging processes.

[0078] Step 7: In the copper-nickel mixed crude concentrate II obtained in Step 5, add sodium carboxymethyl cellulose at a ratio of 50 g / t of slurry mass for 3 minutes, then add sodium alginate at a ratio of 50 g / t of slurry mass for 3 minutes, adjust the pH of the slurry to 9, and then refine for 5 minutes to obtain refined slurry and middlings III; In the obtained refined slurry, add sodium carboxymethyl cellulose at a ratio of 35 g / t of refined slurry mass for 3 minutes, then add sodium alginate at a ratio of 35 g / t of refined slurry mass for 3 minutes, adjust the pH of the slurry to 9, and then refine again for 4 minutes to obtain copper-nickel mixed concentrate II and middlings II;

[0079] The obtained copper-nickel mixed concentrate I and copper-nickel mixed concentrate II were collected as the final products of this process. The yields of copper-nickel mixed concentrate I and copper-nickel mixed concentrate II obtained in this embodiment, the grades of Ni, Cu and MgO in the concentrates, and the recovery rates of Ni and Cu are shown in Table 2.

[0080] Comparative Example 4

[0081] like Figure 6 The conventional flotation process for copper-nickel sulfide ore concentrate shown is based on a process for reducing the serpentine content in copper-nickel sulfide ore concentrate as described in Example 2. No depressants are added during flotation in steps three, five, and seven. The resulting copper-nickel mixed concentrate I and copper-nickel mixed concentrate II are collected as the final products of Comparative Example 2. The yields of copper-nickel mixed concentrate I and copper-nickel mixed concentrate II obtained in Comparative Example 2, the grades of Ni, Cu, and MgO in the concentrates, and the recoveries of Ni and Cu are shown in Table 2.

[0082] Table 4

[0083]

[0084] As shown in Tables 1 to 4, in Example 1, the product obtained using the process described in this invention exhibits significantly better performance in all aspects than the traditional flotation process described in Comparative Example 1. Therefore, compared with the traditional process, the process described in this invention reduces the serpentine content in the concentrate, demonstrating significant advantages.

[0085] The above are merely preferred embodiments of the present invention. It should be noted that, for those skilled in the art, other equivalent modifications and improvements can be made based on the technical teachings provided by the present invention, and these should also be considered within the scope of protection of the present invention.

Claims

1. A process for reducing the serpentine content in copper-nickel sulfide ore concentrate, characterized in that: Includes the following steps: Step 1: Grind the copper-nickel sulfide ore until the mass percentage of ore particles with a fineness of -200 mesh in the slurry is 68%. Step 2: Perform a copper-nickel mixed roughing flotation on the slurry prepared in Step 1. Add ammonium sulfate to the slurry at a ratio of 500 g / t of slurry mass and act for 2 min, then add a collector and act for 2 min. Adjust the pH of the slurry to 7-9, and roughing for 8-12 min to obtain copper-nickel mixed rough concentrate I. Step 3: Add inhibitors to the copper-nickel mixed crude concentrate I obtained in Step 2 and perform two cleaning processes to adjust the pH of the slurry to 7-9. The added inhibitors are sodium carboxymethyl cellulose or a mixture of sodium carboxymethyl cellulose and sodium alginate. After cleaning, copper-nickel mixed concentrate I is obtained. Step 4: Combine the tailings obtained in Step 2 and the underflow obtained in Step 3 through primary beneficiation and grind them again. The mass percentage of ore particles with a fineness of -200 mesh to -400 mesh in the slurry should be 85%. Step 5: Perform secondary copper-nickel mixed roughing flotation on the slurry obtained in Step 4. Add inhibitor to the slurry for 2 minutes and then add collector. Adjust the pH of the slurry to 7-9 and float for 6 minutes to obtain copper-nickel mixed rough concentrate II and tailings. Step 6: Perform two scavenging processes on the tailings obtained in Step 5. During each scavenging process, add ethyl xanthate at a ratio of 10-20 g / t of tailings mass and butyl ammonium black at a ratio of 2 g / t of tailings mass to adjust the pH of the slurry to 7-9. Step 7: Add inhibitors to the copper-nickel mixed rough concentrate II obtained in step 5 and perform two cleaning processes to adjust the pH of the pulp to 7-9. After cleaning, copper-nickel mixed concentrate II is obtained. The copper-nickel mixed concentrate I and copper-nickel mixed concentrate II obtained are the final products of this process; The inhibitors added in steps three, five, and seven are sodium carboxymethyl cellulose or a mixture of sodium carboxymethyl cellulose and sodium alginate; sodium carboxymethyl cellulose is added at a ratio of 0-500 g / t of slurry mass, and sodium alginate is added at a ratio of 50-500 g / t of slurry mass; when the inhibitor is a mixture of sodium carboxymethyl cellulose and sodium alginate, sodium carboxymethyl cellulose is added first and allowed to act for 3 minutes, followed by sodium alginate and allowed to act for 3 minutes.

2. The process for reducing the serpentine content in copper-nickel sulfide ore concentrate according to claim 1, characterized in that: The collectors added in step two are ethyl xanthate and butyl ammonium black powder. Ethyl xanthate is added at a ratio of 100-140 g / t of slurry mass, and butyl ammonium black powder is added at a ratio of 14 g / t of slurry mass.

3. A process for reducing the serpentine content in copper-nickel sulfide ore concentrate according to claim 1 or 2, characterized in that: The collectors added in step five are ethyl xanthate and butyl ammonium black powder. Ethyl xanthate is added at a ratio of 100-140 g / t of slurry mass, and butyl ammonium black powder is added at a ratio of 14 g / t of slurry mass.

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