Beneficiation process of copper-nickel ore

Abstract

The invention discloses a beneficiation process for copper-nickel ore, and relates to the technical field of beneficiation, and the beneficiation process comprises the following steps: S1, crushing and screening the copper-nickel ore to obtain raw ore; s2, lime is added into the raw ore for ore grinding; s3, copper flotation is conducted, specifically, sodium hexametaphosphate, water glass, Z-200 and 2 # oil are added into the ground raw ore, copper roughing is conducted, and rough copper concentrate 1 and copper tailings 1 are obtained; carrying out two-stage concentration on the crude copper concentrate 1 to obtain copper concentrate; performing copper scavenging on the copper tailings 1 to obtain copper tailings 2; s4, nickel flotation is conducted, specifically, sodium hexametaphosphate, water glass, copper sulfate, butyl xanthate and 2 # oil are added into the copper tailings 2, nickel roughing is conducted, and nickel rough concentrate 1 and nickel tailings 1 are obtained; and the nickel rough concentrate 1 is subjected to two-stage concentration, the nickel tailings 1 are subjected to three-stage scavenging, and nickel concentrate and nickel tailings are obtained. According to the method, copper and nickel in the copper-nickel ore are recovered by adopting the technological process of primary roughing, primary scavenging and secondary refining for preferential copper flotation and primary roughing, tertiary scavenging and secondary refining for nickel flotation, and a proper adding agent is selected, so that the recovery rates of the copper and the nickel are relatively high.

Description

Technical Field

[0001] The invention relates to the technical field of ore dressing, in particular to a copper-nickel ore dressing process. Background Art

[0002] The commonly used schemes for copper-nickel ore beneficiation are priority flotation and mixed flotation. Priority flotation method: the flotation process of selecting two or more useful minerals one by one as concentrate. In the selection process of sulfide copper-nickel ore, direct priority flotation or partial priority flotation can be used; when the copper content in the ore is higher than that of nickel and the mineral symbiosis is relatively simple, priority flotation can be considered. However, during the flotation process, nickel will be suppressed when floating copper and is not easy to be activated, resulting in a low nickel recovery rate.

[0003] Mixed flotation method: Compared with priority flotation, the mixed flotation process can achieve better results when processing copper-nickel sulfide ores with low grade, easy to muddy and easy to float, and containing more magnesium silicate gangue minerals. At present, most of the copper-nickel sulfide ores in my country use the mixed flotation method. After the copper-nickel concentrate is selected, the copper-nickel separation flotation or smelting into high-grade nickel matte is directly carried out, and then the ore is ground and flotated to separate copper and nickel. However, during mixed flotation, the nickel recovery rate is still low, and a large amount of chemical agents are required, which causes great environmental pollution.

[0004] The above two beneficiation processes have certain limitations when beneficiating raw ores with complex interpenetration relationships, and the recovery rates of copper and nickel are low. The present invention aims to provide a copper-nickel ore beneficiation process, which can recover copper and nickel from raw ores with complex interpenetration relationships and improve the recovery rates of copper and nickel. Summary of the invention

[0005] The object of the present invention is to overcome the shortcomings of the prior art and provide a copper-nickel ore beneficiation process, which adopts one roughing and one sweeping and two refining to preferentially float copper and one roughing and three sweeping and two refining to float nickel, so as to obtain copper and nickel with higher yields.

[0006] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0007] A copper-nickel ore dressing process, comprising:

[0008] S1, crushing the copper-nickel ore and then screening it to obtain the raw ore;

[0009] S2, adding lime to the raw ore for grinding;

[0010] S3, copper flotation:

[0011] Copper roughing: add sodium hexametaphosphate, water glass, Z-200, 2 # After oiling, copper roughing is carried out for 3.5-4.5 minutes; crude copper concentrate 1 and copper tailings 1 are obtained;

[0012] Two-stage concentration: after adding lime, sodium hexametaphosphate and water glass to the crude copper concentrate 1, the first stage of concentration is carried out for 2.5-3.5 minutes to obtain copper concentrate 1 and copper middling 2; after adding lime, sodium hexametaphosphate and water glass to the copper concentrate 1, the second stage of concentration is carried out for 2-3 minutes to obtain copper concentrate and copper middling 1;

[0013] Copper scavenging: Add Z-200, 2 # The oil is used for copper scavenging, and the scavenging time is 2.5-3.5 minutes to obtain copper middlings 3 and copper tailings 2;

[0014] S4, Nickel Flotation:

[0015] Nickel roughing: add sodium hexametaphosphate, water glass, copper sulfate, butyl xanthate, 2 # After oiling, nickel roughing is carried out for 3.5-4.5 minutes to obtain nickel rough concentrate 1 and nickel tailings 1;

[0016] Two-stage selection: in the first stage, sodium hexametaphosphate, water glass, copper sulfate and butyl xanthate are sequentially added to the nickel crude concentrate 1, and the mixture is selected for 2.5-3.5 minutes to obtain nickel concentrate 1 and nickel middling 5; in the second stage, sodium hexametaphosphate, water glass and copper sulfate are sequentially added to the nickel concentrate 1, and the mixture is selected for 2.5-3.5 minutes to obtain nickel concentrate and nickel middling 4;

[0017] Three-stage scavenging: The first stage scavenging: add sodium hexametaphosphate, water glass, copper sulfate, butyl xanthate, 2 # After oiling, sweep and select for 3-4 minutes to obtain nickel tailings 2 and nickel middlings 6;

[0018] The second stage of scavenging: add copper sulfate, butyl xanthate, 2 # After oiling, sweep and select for 3-4 minutes to obtain nickel tailings 3 and nickel middlings 7;

[0019] The third stage of scavenging: add copper sulfate, butyl xanthate, 2 # After oiling, scavenging is performed for 2.5-3.5 minutes to obtain nickel tailings and nickel middlings 8.

[0020] Furthermore, in step S1, the ore is firstly crushed by a jaw crusher and then crushed by a double-roll crusher to obtain the raw ore with a particle size less than 3 mm.

[0021] Furthermore, in step S2, the amount of lime added is 2000 g / t, and the grinding fineness is -0.074 mm, accounting for 85%.

[0022] Furthermore, in step S3, when the copper is roughly selected, 200 g / t sodium hexametaphosphate is added in sequence and stirred for 3 min, 200 g / t water glass is stirred for 3 min, 20 g / t Z-200 is stirred for 2 min, and 20 g / t 2 # Stir the oil for 2 min.

[0023] Further, step S3 adds 200 g / t of lime to the crude copper concentrate 1 and stirs for 3 min, 50 g / t of sodium hexametaphosphate and stirs for 3 min, and 50 g / t of water glass and stirs for 2 min, and then performs a first stage of concentration for 3 min to obtain copper concentrate 1 and copper middling 2; adds 200 g / t of lime to the copper concentrate 1 and stirs for 3 min, 25 g / t of sodium hexametaphosphate and stirs for 2 min, and 50 g / t of water glass and stirs for 2 min, and then performs a second stage of concentration for 2.5 min to obtain copper concentrate and copper middling 1;

[0024] When copper is scavenged in step S3, 10 g / t Z-200 and 10 g / t 2 # After stirring the oil for 3 minutes, sweep and select.

[0025] Further, when the nickel roughing is performed in step S4, 200 g / t sodium hexametaphosphate is added to the copper tailings 2 in sequence and stirred for 3 min, 200 g / t water glass is stirred for 3 min, 1000 g / t copper sulfate is stirred for 2 min, 100 g / t butyl xanthate is stirred for 2 min, and 20 g / t 2 # After oil stirring for 2 minutes, nickel roughing was carried out for 4 minutes to obtain a nickel rough concentrate 1 and a nickel tailing 1.

[0026] Furthermore, when two stages of selection are performed in step S4, in the first stage, 50 g / t sodium hexametaphosphate, 50 g / t water glass, 20 g / t copper sulfate, and 20 g / t butyl xanthate are sequentially added to the nickel rough concentrate 1 and stirred for 3 min, and then the mixture is stirred for 2 min, and then the mixture is selected for 3 min to obtain nickel concentrate 1 and nickel middling 5; in the second stage, 30 g / t sodium hexametaphosphate, 30 g / t water glass, and 10 g / t copper sulfate are sequentially added to the nickel concentrate 1 and stirred for 3 min, and then the mixture is stirred for 2 min, and then the mixture is selected for 3 min to obtain nickel concentrate and nickel middling 4.

[0027] Furthermore, when three-stage scanning is performed in step S4, the specific operations are as follows:

[0028] The first stage of scavenging: add 100g / t sodium hexametaphosphate to nickel tailings 1 and stir for 3min, 100g / t water glass and stir for 3min, 500g / t copper sulfate and stir for 2min, 50g / t butyl xanthate and stir for 2min, 10g / t 2 #After oil stirring for 2 minutes, scavenging for 3.5 minutes was performed to obtain nickel tailings 2 and nickel middlings 6;

[0029] Second stage scavenging: add 500g / t copper sulfate to nickel tailings 2 and stir for 2min, 50g / t butyl xanthate and stir for 2min, 10g / t 2 # After oil stirring for 2 minutes, scavenging for 3.5 minutes was performed to obtain nickel tailings 3 and nickel middlings 7;

[0030] The third stage of scavenging: add 250g / t copper sulfate to the nickel tailings 3 and stir for 2min, 25g / t butyl xanthate and stir for 2min, 5g / t 2 # After the oil was stirred for 2 minutes, the nickel tailings and nickel middlings 8 were obtained by scavenging for 3 minutes.

[0031] Further, copper ore 2 and copper ore 3 are returned to step S3 for copper roughing, and copper ore 1 is returned to step S3 for two-stage concentration; nickel ore 5 and nickel ore 6 are returned to step S4 for nickel roughing, nickel ore 4 is returned to step S4 for two-stage concentration, nickel ore 7 is returned to step S4 for the first stage scavenging, and nickel ore 8 is returned to step S4 for the second stage scavenging.

[0032] Furthermore, all the filtered water generated in the mineral processing process is recycled as return water.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] (1) The present invention adopts a process flow of one roughing and one sweeping and two refining to preferentially float copper and one roughing and three sweeping and two refining to float nickel to recover copper and nickel in copper-nickel ore, and selects appropriate additives to make the recovery rates of copper and nickel high, and can obtain copper concentrate with a copper grade of 22.00% and a copper recovery rate of 75.20% and nickel concentrate with a nickel grade of 7.50% and a nickel recovery rate of 80.34%, thereby realizing the comprehensive utilization of copper and nickel in the original ore.

[0035] (2) The present invention adopts a closed-circuit process to beneficiate copper-nickel ore, which can reduce the yield of tailings.

[0036] (3) The process provided by the present invention is used for ore dressing, and each product is filtered. The collected copper concentrate water, nickel concentrate water, and tailings water can be used as return water, and the return water can be fully recycled to achieve the purpose of saving water resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a schematic diagram of the ore dressing opening process flow in an embodiment of the present invention;

[0038] Figure 2 It is a schematic diagram of the closed-circuit process flow of ore dressing in an embodiment of the present invention. DETAILED DESCRIPTION

[0039] The present invention is further described below in conjunction with the accompanying drawings and embodiments. The embodiments of the present invention include but are not limited to the following embodiments.

[0040] In this embodiment, the Lengshuiqing copper-nickel mine in Yanbian County, Sichuan Province is used as the raw ore for beneficiation. The copper grade in the raw ore is 0.17%, the nickel grade is 0.38%, the MgO content is 21.98%, and the associated beneficial elements are mainly Au, Ag, Pd, Pt, and Co. Among them, copper mainly exists in the form of primary copper sulfide and secondary copper sulfide, accounting for about 97.32% of the total copper; nickel mainly exists in the form of nickel sulfide, accounting for about 84.90% of the total nickel.

[0041] The original ore mainly contains pentlandite and pyrrhotite, with rare chalcopyrite, magnetite, ilmenite, pyrite, and sphalerite and rutile. The relationship between copper and nickel minerals in the original ore is complex, with copper mainly embedded in pyrrhotite in the form of chalcopyrite or in conjunction with pyrrhotite and pentlandite. Nickel is mainly produced in the form of pentlandite, often embedded in pyrrhotite, with chalcopyrite and magnetite.

[0042] like Figure 1 As shown, the mineral processing process provided in this embodiment includes the following steps:

[0043] (1) The collected copper-nickel ore is coarsely crushed by a jaw crusher and finely crushed by a roll crusher, and then sieved to obtain raw ore with a particle size of less than 3 mm.

[0044] (2) Grinding: Add 2000g / t of lime to the raw ore for grinding. When the grinding fineness is -0.074mm, accounting for 85% (the ore particles with a fineness less than 0.074mm account for 85% of the total grinding amount), subsequent beneficiation is carried out.

[0045] (3) Copper flotation

[0046] S31, copper roughing: add 400g / t of depressant to the ore after grinding and stir for 6min, 20g / t of collector and 20g / t of frother for 2min, and then carry out copper roughing. The copper roughing time is 4min. 1 crude copper concentrate and 1 copper tailings are obtained.

[0047] The inhibitor is sodium hexametaphosphate and water glass in a mass ratio of 1:1, that is, add 200g / t sodium hexametaphosphate and stir for 3 minutes, add 200g / t water glass and stir for 3 minutes, the collector is Z-200, and the foaming agent is 2 # Oil;

[0048] S32, performing two-stage concentration on the crude copper concentrate 1, in the first stage, adding 200 g / t of lime and stirring for 3 min, 50 g / t of sodium hexametaphosphate and stirring for 3 min, 50 g / t of water glass and stirring for 2 min, and then concentrating for 3 min to obtain copper concentrate 1 and copper middling 2; performing a second stage of concentration on the copper concentrate 1, adding 200 g / t of lime and stirring for 3 min, 25 g / t of sodium hexametaphosphate and stirring for 2 min, 50 g / t of water glass and stirring for 2 min, and then concentrating for 2.5 min to obtain copper concentrate and copper middling 1;

[0049] S33, scavenging the copper tailings 1, adding 10g / t Z-200 and stirring for 3min, 10g / t 2 # After oil stirring for 3 minutes, scavenging for 3 minutes, copper middlings 3 and copper tailings 2 were obtained.

[0050] The crude copper concentrate 1 is subjected to two-stage concentration to obtain a copper concentrate with a copper grade of 25.86% and a copper recovery rate of 56.78%. At the same time, 14.55% of the copper enters the copper tailings 2. The copper flotation results (unit: %) are shown in the following table:

[0051]

[0052] (4) Nickel flotation: Use copper tailings 2 as raw material to carry out nickel flotation

[0053] S41, nickel roughing: add 200g / t sodium hexametaphosphate to copper tailings 2 and stir for 3min, 200g / t water glass and stir for 3min, 1000g / t copper sulfate and stir for 2min, 100g / t butyl xanthate and stir for 2min, 20g / t 2 # After oil stirring for 2 minutes, nickel roughing was carried out for 4 minutes to obtain nickel rough concentrate 1 and nickel tailings 1;

[0054] In the above steps, sodium hexametaphosphate and water glass are inhibitors, copper sulfate is an activator, butyl xanthate is a collector, 2 # Oil is a foaming agent;

[0055] S42, the nickel concentrate 1 is subjected to two-stage selection, in the first stage, 50 g / t sodium hexametaphosphate is added and stirred for 3 min, 50 g / t water glass is added and stirred for 3 min, 20 g / t copper sulfate is added and stirred for 2 min, 20 g / t butyl xanthate is added and stirred for 2 min, and then the nickel concentrate 1 and nickel middling 5 are obtained; the nickel concentrate 1 is subjected to the second stage selection, 30 g / t sodium hexametaphosphate is added and stirred for 3 min, 30 g / t water glass is added and stirred for 3 min, 10 g / t copper sulfate is added and stirred for 2 min, and then the nickel concentrate and nickel middling 4 are obtained;

[0056] S43, the nickel tailings 1 are subjected to the following three-stage sweeping:

[0057] The first stage of scavenging: add 100g / t sodium hexametaphosphate to nickel tailings 1 and stir for 3min, 100g / t water glass and stir for 3min, 500g / t copper sulfate and stir for 2min, 50g / t butyl xanthate and stir for 2min, 10g / t 2 # After oil stirring for 2 minutes, scavenging for 3.5 minutes was performed to obtain nickel tailings 2 and nickel middlings 6;

[0058] Second stage scavenging: Add 500g / t copper sulfate to nickel tailings 2 and stir for 2min, 50g / t butyl xanthate and stir for 2min, 10g / t 2 # After oil stirring for 2 minutes, scavenging for 3.5 minutes was performed to obtain nickel tailings 3 and nickel middlings 7;

[0059] The third stage of scavenging: add 250g / t copper sulfate to the nickel tailings 3 and stir for 2min, 25g / t butyl xanthate and stir for 2min, 5g / t 2 # After the oil was stirred for 2 minutes, the nickel tailings and nickel middlings 8 were obtained by scavenging for 3 minutes.

[0060] Nickel flotation was performed on the copper tailings 2 to obtain nickel concentrate with a nickel grade of 8.35% and a nickel recovery rate of 62.78%. The nickel flotation results (unit: %) are shown in the following table:

[0061]

[0062] The above flotation process is an open circuit process, which produces copper concentrate, nickel concentrate, tailings and eight middlings (3 copper middlings and 5 nickel middlings). Copper concentrate with a copper grade of 25.86% and a copper recovery rate of 56.78% can be obtained; nickel concentrate with a nickel grade of 8.35% and a nickel recovery rate of 62.78% can be obtained.

[0063] In order to improve the recovery rate of copper concentrate and nickel concentrate, the above open circuit process is adjusted to a closed circuit process in this embodiment, such as Figure 2 As shown, copper ore 2 and copper ore 3 are returned to step S31 for copper roughing, and copper ore 1 is returned to step S32 for two-stage concentration; nickel ore 5 and nickel ore 6 are returned to step S41 for nickel roughing, nickel ore 4 is returned to step S42 for two-stage concentration, nickel ore 7 is returned to the first stage scavenging in step S43, and nickel ore 8 is returned to the second stage scavenging in step S43. By adjusting to a closed-circuit process, a copper concentrate with a copper grade of 22.00% and a copper recovery rate of 75.20% and a nickel concentrate with a nickel grade of 7.50% and a nickel recovery rate of 80.34% can be obtained. The results of the closed-circuit flotation process (unit: %) are shown in the following table:

[0064]

[0065] When adopting the closed-circuit process for mineral processing, each product is filtered, and the copper concentrate water, nickel concentrate water, and tailings water are collected for use as return water. After the return water is left to stand for three days, it is mixed with clean water at a ratio of 30%, 50%, and 70%, and a return water return ratio test is conducted. The test results are shown in the following table:

[0066]

[0067] It can be seen from the above table that the use of all clean water or a mixture of clean water and return water has little effect on the indicators in the mineral processing process, so the return water generated in this embodiment can be fully recycled.

[0068] Through the analysis of the concentrate, except for MgO, all elements in the copper concentrate meet the requirements of YS / T 318-2007 Grade III products, and all elements in the nickel concentrate meet the requirements of YS / T 340-2014 Grade III products. About 27.79%, 6.83%, 4.45% and 3.87% of the gold, silver, platinum and palladium in the raw ore enter the copper concentrate, and about 27.13%, 7.02%, 63.09% and 74.16% enter the nickel concentrate. The associated beneficial component cobalt mainly enters the nickel concentrate product, and the cobalt grade and recovery rate in the nickel concentrate are 0.25% and 56.53% respectively.

[0069] The above embodiment is only one of the preferred implementation modes of the present invention and should not be used to limit the protection scope of the present invention. Any changes or modifications that are made to the main design concept and spirit of the present invention and have no substantive significance, and the technical problems they solve are still consistent with the present invention, should be included in the protection scope of the present invention.

Claims

1. A copper-nickel ore dressing process, characterized in that: include: S1, crushing the copper-nickel ore and then screening it to obtain the raw ore; S2, adding lime to the raw ore for grinding; S3, copper flotation: Copper roughing: add sodium hexametaphosphate, water glass, Z-200, 2 # After oiling, copper roughing is carried out for 3.5-4.5 minutes; crude copper concentrate 1 and copper tailings 1 are obtained; Two-stage concentration: after adding lime, sodium hexametaphosphate and water glass to the crude copper concentrate 1, the first stage of concentration is carried out for 2.5-3.5 minutes to obtain copper concentrate 1 and copper middling 2; after adding lime, sodium hexametaphosphate and water glass to the copper concentrate 1, the second stage of concentration is carried out for 2-3 minutes to obtain copper concentrate and copper middling 1; Copper scavenging: Add Z-200, 2 # The oil is used for copper scavenging, and the scavenging time is 2.5-3.5 minutes to obtain copper middlings 3 and copper tailings 2; S4, Nickel Flotation: Nickel roughing: add sodium hexametaphosphate, water glass, copper sulfate, butyl xanthate, 2 # After oiling, nickel roughing is carried out for 3.5-4.5 minutes to obtain nickel rough concentrate 1 and nickel tailings 1; Two-stage selection: in the first stage, sodium hexametaphosphate, water glass, copper sulfate and butyl xanthate are sequentially added to the nickel crude concentrate 1, and the mixture is selected for 2.5-3.5 minutes to obtain nickel concentrate 1 and nickel middling 5; in the second stage, sodium hexametaphosphate, water glass and copper sulfate are sequentially added to the nickel concentrate 1, and the mixture is selected for 2.5-3.5 minutes to obtain nickel concentrate and nickel middling 4; Three-stage scavenging: The first stage scavenging: add sodium hexametaphosphate, water glass, copper sulfate, butyl xanthate, 2 # After oiling, sweep and select for 3-4 minutes to obtain nickel tailings 2 and nickel middlings 6; The second stage of scavenging: add copper sulfate, butyl xanthate, 2 # After oiling, sweep and select for 3-4 minutes to obtain nickel tailings 3 and nickel middlings 7; The third stage of scavenging: add copper sulfate, butyl xanthate, 2 # After oiling, scavenging is performed for 2.5-3.5 minutes to obtain nickel tailings and nickel middlings 8.

2. A copper-nickel ore dressing process according to claim 1, characterized in that: In step S1, the ore is firstly crushed by a jaw crusher and then crushed by a roller crusher to obtain the raw ore with a particle size less than 3 mm.

3. A copper-nickel ore dressing process according to claim 2, characterized in that: In step S2, the amount of lime added is 2000 g / t, and the grinding fineness is -0.074 mm, accounting for 85%.

4. A copper-nickel ore dressing process according to claim 3, characterized in that: In step S3, when copper is roughly selected, 200 g / t sodium hexametaphosphate is added in sequence and stirred for 3 min, 200 g / t water glass is stirred for 3 min, 20 g / t Z-200 is stirred for 2 min, and 20 g / t 2 # Stir the oil for 2 min.

5. A copper-nickel ore dressing process according to claim 4, characterized in that: Step S3: After adding 200 g / t of lime to the crude copper concentrate 1 and stirring for 3 min, 50 g / t of sodium hexametaphosphate and stirring for 3 min, and 50 g / t of water glass and stirring for 2 min, the first stage of concentration is performed for 3 min to obtain copper concentrate 1 and copper middling 2; after adding 200 g / t of lime to the copper concentrate 1 and stirring for 3 min, 25 g / t of sodium hexametaphosphate and stirring for 2 min, and 50 g / t of water glass and stirring for 2 min, the second stage of concentration is performed for 2.5 min to obtain copper concentrate and copper middling 1; When copper is scavenged in step S3, 10 g / t Z-200 and 10 g / t 2 # After stirring the oil for 3 minutes, sweep and select.

6. A copper-nickel ore dressing process according to claim 5, characterized in that: When nickel roughing is performed in step S4, 200 g / t sodium hexametaphosphate is added to the copper tailings 2 in sequence and stirred for 3 min, 200 g / t water glass is stirred for 3 min, 1000 g / t copper sulfate is stirred for 2 min, 100 g / t butyl xanthate is stirred for 2 min, and 20 g / t 2 # After the oil was stirred for 2 minutes, the nickel roughing was carried out for 4 minutes to obtain a nickel rough concentrate 1 and a nickel tailing 1.

7. A copper-nickel ore dressing process according to claim 6, characterized in that: When two stages of selection are performed in step S4, in the first stage, 50 g / t sodium hexametaphosphate, 50 g / t water glass, 20 g / t copper sulfate, and 20 g / t butyl xanthate are sequentially added to the nickel rough concentrate 1 and stirred for 3 min, and then the mixture is selected for 3 min to obtain nickel concentrate 1 and nickel middling 5; in the second stage, 30 g / t sodium hexametaphosphate, 30 g / t water glass, and 10 g / t copper sulfate are sequentially added to the nickel concentrate 1 and stirred for 3 min, and then the mixture is selected for 3 min to obtain nickel concentrate and nickel middling 4.

8. A copper-nickel ore dressing process according to claim 7, characterized in that: When performing three-stage scanning in step S4, the specific operations are as follows: The first stage of scavenging: add 100g / t sodium hexametaphosphate to nickel tailings 1 and stir for 3min, 100g / t water glass and stir for 3min, 500g / t copper sulfate and stir for 2min, 50g / t butyl xanthate and stir for 2min, 10g / t 2 # After oil stirring for 2 minutes, scavenging for 3.5 minutes was performed to obtain nickel tailings 2 and nickel middlings 6; Second stage scavenging: add 500g / t copper sulfate to nickel tailings 2 and stir for 2min, 50g / t butyl xanthate and stir for 2min, 10g / t 2 # After oil stirring for 2 minutes, scavenging for 3.5 minutes was performed to obtain nickel tailings 3 and nickel middlings 7; The third stage of scavenging: add 250g / t copper sulfate to the nickel tailings 3 and stir for 2min, 25g / t butyl xanthate and stir for 2min, 5g / t 2 # After the oil was stirred for 2 minutes, the nickel tailings and nickel middlings 8 were obtained by scavenging for 3 minutes.

9. A copper-nickel ore dressing process according to claim 8, characterized in that: The copper ore 2 and the copper ore 3 are returned to step S3 for copper roughing, and the copper ore 1 is returned to step S3 for two-stage cleaning; the nickel ore 5 and the nickel ore 6 are returned to step S4 for nickel roughing, and the nickel ore 4 is returned to step S4 for two-stage cleaning, the nickel ore 7 is returned to step S4 for the first stage scavenging, and the nickel ore 8 is returned to step S4 for the second stage scavenging.

10. A copper-nickel ore dressing process according to claim 9, characterized in that: All filtered water generated during the mineral processing process is recycled as return water.

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