A method for strengthening magnetic separation of platinum group metals in high nickel matte

Abstract

The present invention relates to a method for strengthening the magnetic separation of platinum group metals in high-nickel matte, and belongs to the technical field of platinum group metal extraction. The present invention uniformly mixes high-nickel matte and additive A (a mixture of borax, quartz sand and fluorite) to obtain a mixture, heats the mixture to a temperature of 1100-1200°C and melts it while keeping it warm to obtain pre-treated molten high-nickel matte; the pre-treated molten high-nickel matte is placed in an induction heating device for induction heating, so that the molten high-nickel matte is uniformly heated to 1200-1300°C to obtain a high-nickel matte crystallization precursor; after adding additive B (nickel-copper-iron alloy) to the high-nickel matte crystallization precursor, the temperature is uniformly cooled to 600-850°C and stirred for 20-50 minutes to obtain activated high-nickel matte; the activated high-nickel matte is rapidly cooled to room temperature to obtain a strengthened high-nickel matte product, and the strengthened high-nickel matte product is successively subjected to grinding and magnetic separation to obtain an alloy product enriched with platinum group metals. The present invention promotes the mass transfer behavior in the high nickel matte condensation process, changes the composition of the alloy phase, and further strengthens the magnetic separation of platinum group metals.

Description

Technical Field

[0001] The invention relates to a method for strengthening magnetic separation of platinum group metals in high-nickel matte, belonging to the technical field of platinum group metal extraction. Background Art

[0002] The principle of traditional platinum group metal smelting is to continuously separate the precious and base metals in the ore through a series of processes. The platinum-palladium flotation concentrate after flotation enrichment is subjected to matte smelting. This process can remove most of the silicate impurities and obtain low-nickel matte enriched with platinum group metals and nickel, copper and iron. Low-nickel matte contains a large amount of iron, and it is necessary to use a blowing process to allow iron and some impurities to enter the slag phase to further enrich the platinum group metals in the low-nickel matte and obtain high-nickel matte.

[0003] At present, the mainstream treatment process of high-nickel matte is the slow cooling-magnetic separation-grinding and flotation method. Its principle is to use the different precipitation orders, mutual solubility, magnetization and flotation characteristics of the alloy phase, copper sulfide and nickel sulfide during the slow cooling of high-nickel matte to achieve the dissociation and recovery of the three phases. During the slow cooling process, platinum group metals tend to be enriched in the alloy phase with better magnetic characteristics, and are dissociated and recovered with the alloy phase and sulfide during the magnetic separation process. However, the current process has the problems of small alloy phase grain size and incomplete capture of platinum group metals by alloy phase. Not only are a large amount of platinum group metals dispersed in the sulfide, but also a large amount of inadequately dissociated platinum group alloys are enriched in the magnetic separation tailings, resulting in the loss of precious and scarce platinum group metals. Therefore, it is of great significance to strengthen the alloy phase grain growth and the capture of platinum group metals by alloy phase during the slow cooling of high-nickel matte.

[0004] During the slow cooling process of high nickel matte, copper sulfide precipitates first. The precipitated copper sulfide does not enrich platinum group metals, but it increases the viscosity of the system. As the temperature further decreases, the nickel-copper-iron alloy phase begins to precipitate. At this time, some platinum group metals first enter the alloy phase. With the precipitation of nickel sulfide, platinum elements begin to migrate from the molten nickel sulfide to the alloy phase in large quantities. The migration process of platinum group metals continues until the high nickel matte is completely solidified. However, due to the precipitation of a large amount of copper sulfide in the early stage, as well as the low crystallization temperature and short crystallization time, the migration behavior of platinum group elements during the crystallization process is severely inhibited, resulting in the distribution and dispersion of platinum group metal resources in the slowly cooled high nickel matte. The alloy phase nucleates and grows during the migration of platinum group metals. The crystal size can be increased by introducing crystal seeds and promoting mass transfer efficiency. The above technical means can effectively increase the enrichment multiple of platinum group metals in the alloy phase in high nickel matte and make the grains grow, promoting the separation and enrichment of platinum group metals in high nickel in magnetic separation. Summary of the invention

[0005] In view of the problem that during the slow cooling process of high-nickel matte, the enrichment degree of platinum group metals in the magnetic alloy phase is poor, and some platinum group metals are dispersed in the sulfide, resulting in incomplete capture of platinum group metals in the subsequent magnetic separation process and waste of platinum group metal resources, the present invention proposes a method for strengthening the magnetic separation of platinum group metals in high-nickel matte. The method can enhance the migration of platinum group metals to the alloy phase by improving the mass transfer behavior during the condensation process of high-nickel matte and changing the composition of the alloy phase. The process flow is reasonably designed, simple to operate and has no environmental pollution.

[0006] A method for strengthening the magnetic separation of platinum group metals in high nickel matte, the specific steps are as follows:

[0007] (1) High nickel matte and additive A are uniformly mixed to obtain a mixture, and the mixture is heated to a temperature of 1100-1200° C. and kept warm to melt to obtain pretreated molten high nickel matte; the additive A is a mixture of borax, quartz sand and fluorite;

[0008] (2) Pre-treating the molten high-nickel matte by placing it in an induction heating device for induction heating, so that the molten high-nickel matte is heated to 1200-1300° C. at a uniform rate to obtain a high-nickel matte crystallization precursor;

[0009] (3) After adding additive B to the high nickel matte crystallization precursor, the mixture is cooled at a uniform rate to 600-850° C. and stirred for 20-50 min to obtain activated high nickel matte; the additive B is a nickel-copper-iron alloy;

[0010] (4) The activated high-nickel matte is rapidly cooled to room temperature to obtain a reinforced high-nickel matte product. The reinforced high-nickel matte product is then subjected to grinding and magnetic separation to obtain an alloy product enriched in platinum group metals.

[0011] Preferably, the amount of borax added in the additive A in step (1) is 1-5% of the mass of the high nickel matte; the effective SiO2 content in the additive A is 1-5% of the mass of the high nickel matte, and the effective CaF2 content is 0.5-2% of the mass of the high nickel matte.

[0012] Preferably, the induction frequency of step (2) is 0.5-1 KHz, and the uniform heating rate is 1-5°C / min.

[0013] Preferably, in the nickel-copper-iron alloy of step (3), the Ni element accounts for 40-60%, the Cu element accounts for 15-25%, and the Fe element accounts for 15-45%. The nickel-copper-iron alloy has a face-centered cubic lattice structure and an average particle size of 15-100 μm.

[0014] Preferably, the amount of nickel-copper-iron alloy added in step (3) is 0.5-2% of the mass of the high nickel matte.

[0015] Preferably, the uniform cooling rate in step (3) is 5-10°C / min, and the stirring rate is 5-10r / min.

[0016] Preferably, the rapid cooling rate in step (4) is 50-120°C / min.

[0017] Preferably, the average particle size after grinding in step (4) is 50-100 μm, and the magnetic field strength of magnetic separation is 70-300 KA / m.

[0018] After grinding and magnetic strengthening, no less than 98.5% of the platinum group metals in the high nickel matte are enriched in the magnetic alloy phase.

[0019] The principle of strengthening the magnetic separation of platinum group metals in high nickel matte: the growth of grains depends on the nucleation rate and crystal growth rate. By adding additives such as borax and calcium fluoride, the melting point of the slag system can be reduced, the fluidity of the slag system can be improved, and the mass transfer efficiency during the crystallization process can be enhanced; adding nickel-copper alloy additives as seeds in the molten state can regulate the nucleation behavior of the alloy phase, avoiding spontaneous nucleation leading to an excessive number of initial crystal nuclei, which affects the final crystal size; in the crystal growth stage, the mass transfer efficiency of the crystal growth process is enhanced by temperature-controlled cooling and stirring, which is not only conducive to crystal growth but also promotes the migration and enrichment of platinum group metals into the alloy phase. The above measures can effectively promote grain growth and platinum group metal enrichment, and achieve efficient separation of platinum group metals in the subsequent magnetic separation process.

[0020] The beneficial effects of the present invention are:

[0021] The present invention can effectively promote the migration of platinum group metals to the alloy phase during the condensation of high-nickel matte, avoid the dispersion of platinum group metals in the sulfide phase, and enable most of the platinum group metals to be enriched in the magnetic product along with the alloy phase during the magnetic separation process, which is beneficial to the subsequent refining and purification of platinum group metals. The present invention can be integrated with the existing high-nickel matte smelting process, has a reasonable process, and has the advantages of energy saving and environmental protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a process flow chart of the present invention. DETAILED DESCRIPTION

[0023] The present invention is further described in detail below in conjunction with specific implementation modes, but the protection scope of the present invention is not limited to the described contents.

[0024] Example 1: In the example of the present invention, the main components of high nickel matte are, by mass percentage, Ni 43.10%, Cu 29.7%, Fe 2 O 3 2.39%, Co 2 O 3 0.30%, S 22.10%, SiO 2 0.8%, Pt 1.61%, and Pd 0.8%;

[0025] A method for enhancing the magnetic separation of platinum group metals from high nickel matte (see Figure 1 ), the specific steps are as follows:

[0026] (1) High nickel matte and additive A (a mixture of borax, quartz sand and fluorite) are uniformly mixed to obtain a mixture, and the mixture is heated to a temperature of 1200° C. and kept warm to melt to obtain pretreated molten high nickel matte; the borax content in the additive A is 4% of the mass of the high nickel matte, the effective SiO2 content is 5% of the mass of the high nickel matte, and the effective CaF2 content is 2% of the mass of the high nickel matte;

[0027] (2) Pre-treating the molten high-nickel matte by placing it in an induction heating device for induction heating (the induction frequency is 0.5 KHz), so that the molten high-nickel matte is heated at a uniform rate (the uniform heating rate is 5°C / min) to 1300°C, and a high-nickel matte crystallization precursor is obtained;

[0028] (3) After adding additive B to the high nickel matte crystallization precursor, the temperature is uniformly reduced (the uniform cooling rate is 8°C / min), cooled to 850°C and stirred for 50 minutes (stirring rate is 8r / min) to obtain activated high nickel matte; the additive B is a nickel-copper-iron alloy, in which Ni element accounts for 60%, Cu element accounts for 20%, and Fe element accounts for 20%. The nickel-copper-iron alloy has a face-centered cubic lattice structure and an average particle size of 200 μm. The additive amount is 2% of the mass of the high nickel matte;

[0029] (4) The activated high-nickel matte is rapidly cooled (rapid cooling rate is 80°C / min) to room temperature to obtain a reinforced high-nickel matte product (platinum group metals are enriched in the magnetic alloy phase); the reinforced high-nickel matte product is successively subjected to grinding (average particle size after grinding is less than 95 μm) and magnetic separation (magnetic field strength is 300 KA / m) to obtain an alloy product enriched with platinum group metals;

[0030] In this embodiment, 99.2% of the platinum group metals in the high nickel matte are enriched in the magnetic alloy product.

[0031] Example 2: In the example of the present invention, the composition of high nickel matte is, by mass percentage, Ni 45.31%, Cu26.35%, Fe2O31.06%, Co2O30.10%, S 24.31%, SiO20.7%, Pt 1.43%, Pd 0.74%;

[0032] A method for enhancing the magnetic separation of platinum group metals from high nickel matte (see Figure 1 ), the specific steps are as follows:

[0033] (1) High nickel matte and additive A (a mixture of borax, quartz sand and fluorite) are uniformly mixed to obtain a mixture, and the mixture is heated to a temperature of 1100° C. and kept warm to melt to obtain pretreated molten high nickel matte; the borax content in the additive A accounts for 5% of the mass of the high nickel matte, the effective SiO2 content is 4.2% of the mass of the high nickel matte, and the effective CaF2 content is 2% of the mass of the high nickel matte;

[0034] (2) Pre-treating the molten high-nickel matte by placing it in an induction heating device for induction heating (induction frequency is 1 kHz), so that the molten high-nickel matte is heated uniformly (uniform heating rate is 3°C / min) to 1300°C, and a high-nickel matte crystallization precursor is obtained;

[0035] (3) After adding additive B to the high nickel matte crystallization precursor, the mixture is cooled uniformly (the uniform cooling rate is 5°C / min) to 800°C and stirred for 45 minutes (the stirring rate is 8 r / min) to obtain activated high nickel matte; the additive B is a nickel-copper-iron alloy, wherein the Ni element accounts for 60%, the Cu element accounts for 20%, and the Fe element accounts for 20%. The nickel-copper-iron alloy has a face-centered cubic lattice structure and an average particle size of 200 μm. The additive B is added in an amount of 2% of the mass of the high nickel matte;

[0036] (4) The activated high-nickel matte is rapidly cooled (rapid cooling rate is 50°C / min) to room temperature to obtain a reinforced high-nickel matte product (platinum group metals are enriched in the magnetic alloy phase); the reinforced high-nickel matte product is successively subjected to grinding (average particle size after grinding is less than 50 μm) and magnetic separation (magnetic field strength is 70 KA / m) to obtain an alloy product enriched with platinum group metals;

[0037] In this embodiment, 98.7% of the platinum group metals in the high nickel matte are enriched in the magnetic alloy product.

[0038] Example 3: In the example of the present invention, the composition of high nickel matte is, by mass percentage, Ni 45.31%, Cu26.35%, Fe2O31.06%, Co2O30.10%, S 24.31%, SiO20.7%, Pt 1.43%, Pd 0.74%;

[0039] A method for enhancing the magnetic separation of platinum group metals from high nickel matte (see Figure 1 ), the specific steps are as follows:

[0040] (1) High nickel matte and additive A (a mixture of borax, quartz sand and fluorite) are uniformly mixed to obtain a mixture, and the mixture is heated to a temperature of 1150° C. and kept warm to melt to obtain pretreated molten high nickel matte; the borax content in the additive A is 1% of the mass of the high nickel matte, the effective SiO2 content is 1% of the mass of the high nickel matte, and the effective CaF2 content is 0.5% of the mass of the high nickel matte;

[0041] (2) Pre-treating the molten high-nickel matte by placing it in an induction heating device for induction heating (the induction frequency is 0.6 KHz), so that the molten high-nickel matte is heated uniformly (the uniform heating rate is 1°C / min) to 1200°C, and a high-nickel matte crystallization precursor is obtained;

[0042] (3) After adding additive B to the high nickel matte crystallization precursor, the mixture is cooled uniformly (the uniform cooling rate is 5°C / min) to 600°C and stirred for 20 minutes (the stirring rate is 5r / min) to obtain activated high nickel matte; the additive B is a nickel-copper-iron alloy, wherein the Ni element accounts for 60%, the Cu element accounts for 20%, and the Fe element accounts for 20%. The nickel-copper-iron alloy has a face-centered cubic lattice structure and an average particle size of 30 μm. The additive amount is 1.5% of the mass of the high nickel matte;

[0043] (4) The activated high-nickel matte is rapidly cooled (the rapid cooling rate is 120°C / min) to room temperature to obtain a reinforced high-nickel matte product (the platinum group metals are enriched in the magnetic alloy phase); the reinforced high-nickel matte product is successively subjected to grinding (the average particle size after grinding is less than 100 μm) and magnetic separation (the magnetic field strength is 300KA / m) to obtain an alloy product enriched with platinum group metals;

[0044] In this embodiment, 98.8% of the platinum group metals in the high nickel matte are enriched in the magnetic alloy product.

[0045] Comparative Example 1: In the embodiment of the present invention, the main components of the high nickel matte are, by mass percentage, Ni 43.10%, Cu 29.7%, Fe 2 O 3 2.39%, Co 2 O 3 0.30%, S 22.10%, SiO 2 0.8%, Pt 1.61%, and Pd 0.8%;

[0046] A method for enhancing the magnetic separation of platinum group metals from high nickel matte (see Figure 1 ), the specific steps are as follows:

[0047] (1) High nickel matte and additive A (a mixture of borax, quartz sand and fluorite) are uniformly mixed to obtain a mixture, and the mixture is heated to a temperature of 1000° C. and kept warm to melt to obtain pretreated molten high nickel matte; the borax content in the additive A is 0.5% of the mass of the high nickel matte, the effective SiO2 content is 6% of the mass of the high nickel matte, and the effective CaF2 content is 0.4% of the mass of the high nickel matte;

[0048] (2) Pre-treating the molten high-nickel matte by placing it in an induction heating device for induction heating (induction frequency is 0.1 KHz), so that the molten high-nickel matte is heated at a uniform rate (uniform heating rate is 12°C / min) to 1250°C, and a high-nickel matte crystallization precursor is obtained;

[0049] (3) After adding additive B to the high nickel matte crystallization precursor, the mixture is cooled uniformly (the uniform cooling rate is 5°C / min) to 600°C and stirred for 20 minutes (the stirring rate is 5r / min) to obtain activated high nickel matte; the additive B is a nickel-copper-iron alloy, wherein the Ni element accounts for 10%, the Cu element accounts for 10%, and the Fe element accounts for 80%. The nickel-copper-iron alloy has a face-centered cubic lattice structure and an average particle size of 10 μm. The additive amount is 0.3% of the mass of the high nickel matte;

[0050] (4) The activated high-nickel matte is rapidly cooled (rapid cooling rate is 500°C / min) to room temperature to obtain a reinforced high-nickel matte product (platinum group metals are enriched in the magnetic alloy phase); the reinforced high-nickel matte product is successively subjected to grinding (average particle size after grinding is less than 20 μm) and magnetic separation (magnetic field strength is 200 KA / m) to obtain an alloy product enriched with platinum group metals;

[0051] In this embodiment, 80.67% of the platinum group metals in the high nickel matte are enriched in the magnetic alloy product.

[0052] Comparative Example 2: In the embodiment of the present invention, the composition of the high nickel matte is, by mass percentage, Ni 43.10%, Cu 29.7%, Fe 2 O 3 2.39%, Co 2 O 3 0.30%, S 22.10%, SiO 2 0.8%, Pt 1.61%, and Pd 0.8%;

[0053] A method for enhancing the magnetic separation of platinum group metals from high nickel matte (see Figure 1 ), the specific steps are as follows:

[0054] (1) High nickel matte and additive A (a mixture of borax, quartz sand and fluorite) are uniformly mixed to obtain a mixture, and the mixture is heated to a temperature of 1000° C. and kept warm to melt to obtain pretreated molten high nickel matte; the borax content in the additive A is 1% of the mass of the high nickel matte, the effective SiO2 content is 1% of the mass of the high nickel matte, and the effective CaF2 content is 0.5% of the mass of the high nickel matte;

[0055] (2) Pre-treating the molten high-nickel matte by placing it in an induction heating device for induction heating (induction frequency is 0.1 KHz), so that the molten high-nickel matte is heated at a uniform rate (uniform heating rate is 12°C / min) to 1100°C, and a high-nickel matte crystallization precursor is obtained;

[0056] (3) without adding additive B to the high nickel matte crystallization precursor, the temperature is uniformly reduced (the uniform cooling rate is 5°C / min) to 600°C, and no stirring is applied during the process to obtain activated high nickel matte;

[0057] (4) The activated high-nickel matte is rapidly cooled (rapid cooling rate is 300°C / min) to room temperature to obtain a reinforced high-nickel matte product (platinum group metals are enriched in the magnetic alloy phase); the reinforced high-nickel matte product is successively subjected to grinding (average particle size after grinding is less than 34 μm) and magnetic separation (magnetic field strength is 169 KA / m) to obtain an alloy product enriched with platinum group metals;

[0058] In this embodiment, 50.78% of the platinum group metals in the high nickel matte are enriched in the magnetic alloy product.

[0059] Comparative Example 3: In the embodiment of the present invention, the composition of high nickel matte is: Ni 43.10%, Cu 29.7%, Fe2O32.39%, Co2O30.30%, S 22.10%, SiO20.8%, Pt 1.61%, Pd 0.8%;

[0060] A method for enhancing the magnetic separation of platinum group metals from high nickel matte (see Figure 1 ), the specific steps are as follows:

[0061] (1) High nickel matte and additive A (a mixture of borax, quartz sand and fluorite) are uniformly mixed to obtain a mixture, and the mixture is heated to a temperature of 1000° C. and kept warm to melt to obtain pretreated molten high nickel matte; the borax content in the additive A is 1% of the mass of the high nickel matte, the effective SiO2 content is 1% of the mass of the high nickel matte, and the effective CaF2 content is 0.5% of the mass of the high nickel matte;

[0062] (2) Pre-treating the molten high-nickel matte by placing it in an induction heating device for induction heating (induction frequency is 0.1 KHz), so that the molten high-nickel matte is heated uniformly (uniform heating rate is 12°C / min) to 1200°C, and a high-nickel matte crystallization precursor is obtained;

[0063] (3) Without adding additive B to the high nickel sulphate crystallization precursor, the product was cooled uniformly (the uniform cooling rate was 5 °C / min) to 600 °C and stirred for 20 min (stirring rate was 5 r / min) to obtain activated high nickel sulphate;

[0064] (4) The activated high-nickel matte is rapidly cooled (rapid cooling rate is 300°C / min) to room temperature to obtain a reinforced high-nickel matte product (platinum group metals are enriched in the magnetic alloy phase); the reinforced high-nickel matte product is successively subjected to grinding (average particle size after grinding is less than 34 μm) and magnetic separation (magnetic field strength is 180 KA / m) to obtain an alloy product enriched with platinum group metals;

[0065] In this embodiment, 52.76% of the platinum group metals in the high nickel matte are enriched in the magnetic alloy product.

[0066] Comparative Example 4: In the embodiment of the present invention, the composition of high nickel matte is: Ni 43.10%, Cu 29.7%, Fe2O32.39%, Co2O30.30%, S 22.10%, SiO20.8%, Pt 1.61%, Pd 0.8%;

[0067] A method for enhancing the magnetic separation of platinum group metals from high nickel matte (see Figure 1 ), the specific steps are as follows:

[0068] (1) heating high nickel matte without additive components to a temperature of 1200° C. and maintaining the temperature to melt, thereby obtaining pretreated molten high nickel matte;

[0069] (2) Pre-treating the molten high-nickel matte by placing it in an induction heating device for induction heating (induction frequency is 0.1 KHz), so that the molten high-nickel matte is heated at a uniform rate (uniform heating rate is 12°C / min) to 1300°C, and a high-nickel matte crystallization precursor is obtained;

[0070] (3) Without adding additive B to the high nickel sulphate crystallization precursor, the product was cooled uniformly (the uniform cooling rate was 5 °C / min) to 600 °C and stirred for 20 min (stirring rate was 5 r / min) to obtain activated high nickel sulphate;

[0071] (4) The activated high-nickel matte is rapidly cooled (rapid cooling rate is 300°C / min) to room temperature to obtain a reinforced high-nickel matte product (platinum group metals are enriched in the magnetic alloy phase); the reinforced high-nickel matte product is successively subjected to grinding (average particle size after grinding is less than 56 μm) and magnetic separation (magnetic field strength is 100 KA / m) to obtain an alloy product enriched with platinum group metals;

[0072] In this embodiment, 42.76% of the platinum group metals in the high nickel matte are enriched in the magnetic alloy product.

[0073] The specific implementation modes of the present invention are described in detail above, but the present invention is not limited to the above implementation modes, and various changes can be made within the knowledge scope of ordinary technicians in this field without departing from the purpose of the present invention.

Claims

1. A method for strengthening the magnetic separation of platinum group metals in high nickel matte, characterized in that: The specific steps are as follows: (1) High nickel matte and additive A are uniformly mixed to obtain a mixture, and the mixture is heated to a temperature of 1100-1200° C. and kept warm to melt to obtain pretreated molten high nickel matte; the additive A is a mixture of borax, quartz sand and fluorite; (2) Pre-treating the molten high-nickel matte by placing it in an induction heating device for induction heating, so that the molten high-nickel matte is heated to 1200-1300° C. at a uniform rate to obtain a high-nickel matte crystallization precursor; (3) After adding additive B to the high nickel matte crystallization precursor, the temperature is uniformly cooled to a temperature of 600-850° C. and stirred for 20-50 minutes to obtain activated high nickel matte; the additive B is a nickel-copper-iron alloy; (4) The activated high-nickel matte is rapidly cooled to room temperature to obtain a reinforced high-nickel matte product. The reinforced high-nickel matte product is then subjected to grinding and magnetic separation to obtain an alloy product enriched in platinum group metals.

2. The method for strengthening magnetic separation of platinum group metals in high nickel matte according to claim 1, characterized in that: In step (1), the amount of borax added in additive A is 1-5% of the mass of high nickel matte; the effective SiO2 content in additive A is 1-5% of the mass of high nickel matte, and the effective CaF2 content is 0.5-2% of the mass of high nickel matte.

3. The method for strengthening magnetic separation of platinum group metals in high nickel matte according to claim 1, characterized in that: In step (2), the induction frequency is 0.5-1 kHz, and the uniform heating rate is 1-5°C / min.

4. The method for strengthening magnetic separation of platinum group metals in high nickel matte according to claim 1, characterized in that: In step (3), the nickel-copper-iron alloy comprises 40-60% Ni, 15-25% Cu and 15-45% Fe. The nickel-copper-iron alloy has a face-centered cubic lattice structure and an average particle size of 15-100 μm.

5. The method for strengthening magnetic separation of platinum group metals in high nickel matte according to claim 1, characterized in that: In step (3), the amount of nickel-copper-iron alloy added is 0.5-2% of the mass of the high nickel matte.

6. The method for strengthening magnetic separation of platinum group metals in high nickel matte according to claim 1, characterized in that: In step (3), the uniform cooling rate is 5-10°C / min, and the stirring rate is 5-10r / min.

7. The method for strengthening magnetic separation of platinum group metals in high nickel matte according to claim 1, characterized in that: The rapid cooling rate in step (4) is 50-120°C / min.

8. The method for strengthening magnetic separation of platinum group metals in high nickel matte according to claim 1, characterized in that: The average particle size after grinding in step (4) is 50-100 μm, and the magnetic field strength of magnetic separation is 70-300 kA / m.

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