Treatment method of copper-nickel concentrate rich in platinum group metals

Abstract

The invention provides a treatment method of copper-nickel concentrate rich in platinum group metals, which comprises the following steps: feeding the copper-nickel concentrate rich in platinum group metals and a first flux into a smelting furnace, and introducing first oxygen-enriched gas for smelting; copper matte and a second flux are continuously fed into a first converting furnace, and second oxygen-enriched gas is continuously introduced for first converting; raw copper and a third flux are fed into the oxygen inclined blowing rotary converter, and oxygen is introduced for second blowing; the crude copper is fed into an anode refining furnace, and air and a first reducing agent are introduced for fire refining; casting the copper liquid into an anode plate, and carrying out electrolytic refining on the anode plate; feeding the first converting slag, the second converting slag, a second reducing agent and a vulcanizing agent into a dilution electric furnace for slag dilution to obtain low-nickel matte and dilution slag; and the low-nickel matte is fed into a third converting furnace, air or oxygen-enriched air is introduced for third converting, and the problem that the recovery rate of nickel metal elements and platinum group metals in the copper-nickel concentrate rich in the platinum group metals is low is solved.

Description

Technical Field

[0001] The present invention relates to the field of metal smelting, and more particularly, to a method for treating copper-nickel concentrate rich in platinum group metals. Background Art

[0002] Copper is an important material for the development of the national economy. With the accelerating industrialization process, the importance of copper has become increasingly prominent. At present, copper smelting can be divided into pyrometallurgy and hydrometallurgy. Pyrometallurgical copper smelting accounts for 85% of the world's copper production. The pyrometallurgical copper smelting process is divided into flash smelting and bath smelting. The pyrometallurgical copper smelting process generally includes processes such as smelting, converting, and fire refining.

[0003] For copper-nickel concentrate rich in platinum group metals (PGM), using the traditional pyrometallurgical process for copper concentrate, the recovery rates of the contained nickel metal element and platinum group metals (PGM) are low. At the same time, when the anode copper contains a high amount of nickel after fire refining, it also has an adverse effect on the next electrolytic refining step. Summary of the Invention

[0004] The main object of the present invention is to provide a method for treating copper-nickel concentrate rich in platinum group metals, so as to solve the problem of low recovery rates of nickel metal element and platinum group metals in copper-nickel concentrate rich in platinum group metals in the prior art.

[0005] To achieve the above object, according to one aspect of the present invention, there is provided a method for treating copper-nickel concentrate rich in platinum group metals, including the following steps:

[0006] Step S1: Feed the copper-nickel concentrate rich in platinum group metals and a first flux into a smelting furnace, and introduce a first oxygen-rich gas for smelting to obtain copper matte and smelting slag; feed the smelting slag into a first slag beneficiation system for beneficiation to obtain a first slag tailing and a first slag concentrate containing copper element, nickel element, and platinum group metals; use the first slag concentrate as return material and supply it to the smelting furnace; wherein, the smelting temperature is 1150°C to 1350°C;

[0007] Step S2: Continuously feed the copper matte and a second flux into a first converting furnace, and continuously introduce a second oxygen-rich gas for the first converting to obtain blister copper and a first converting slag; wherein, the temperature of the first converting is 1200°C to 1300°C; calculated by volume percentage, the oxygen concentration in the second oxygen-rich gas is 21% to 35%;

[0008] Step S3: Feed the blister copper and a third flux into an oxygen inclined-blow rotary converter, and introduce oxygen for the second converting to obtain crude copper and a second converting slag; wherein, the temperature of the second converting is 1200°C to 1350°C;

[0009] Step S4: Feed the blister copper into an anode refining furnace, and conduct pyrometallurgical refining by introducing air and a first reducing agent to obtain copper liquid; Cast the copper liquid into anode plates, and conduct electrolytic refining on the anode plates to obtain cathode plates with deposited metallic copper, electrolyte containing nickel ions, and anode slime containing platinum group metals; Among them, the pyrometallurgical refining temperature is 1150°C to 1350°C;

[0010] Step S5: Feed the first converting slag, the second converting slag, the second reducing agent, and the sulfiding agent into a matte smelting furnace for slag impoverishment to obtain low nickel matte and impoverished slag; Send the impoverished slag to a second slag beneficiation system for beneficiation to obtain second slag tailings and second slag concentrates containing copper, nickel, and platinum group metals; The temperature of the slag impoverishment is 1200°C to 1400°C;

[0011] Step S6: Feed the low nickel matte into a third converting furnace, and conduct the third converting by introducing air or oxygen-enriched air to obtain high nickel matte and third converting slag; Use the slag concentrate as return material and supply it to the smelting furnace; Use the third converting slag as return material and supply it to the matte smelting furnace; Among them, the temperature of the third converting is 1250°C to 1300°C.

[0012] Furthermore, in step S1, the smelting furnace is selected from an oxygen-enriched side-blown furnace or an oxygen bottom-blown furnace.

[0013] Furthermore, in step S1, by volume percentage, the oxygen concentration in the first oxygen-enriched gas is 70% to 85%.

[0014] Furthermore, in step S1, by mass ratio, the iron-silicon ratio in the smelting slag is (1.2 to 1.8):1.

[0015] Furthermore, in step S2, the first converting furnace is selected from a multi-gun top-blown furnace, an oxygen bottom-blown furnace, or a PS converter.

[0016] Furthermore, in step S2, the second flux is selected from one or both of quartzite and quartz sand.

[0017] Furthermore, in step S2, by mass ratio, the iron-silicon ratio in the first converting slag is (1.0 to 1.4):1.

[0018] Furthermore, in step S3, the time of the second converting is 1h to 3h.

[0019] Furthermore, in step S3, the third flux is selected from one or both of quartzite and quartz sand.

[0020] Furthermore, in step S3, by mass ratio, the copper-silicon ratio in the second converting slag is (0.6 to 1.0):1.

[0021] Furthermore, in step S4, a rotary anode refining furnace is used for the anode refining furnace.

[0022] Further, in step S4, the first reducing agent is selected from one or two of natural gas, coal, etc.

[0023] Further, in step S5, the second reducing agent is injected into the matte smelting furnace through a side-blown lance.

[0024] Further, in step S5, the second reducing agent is selected from one or two of pulverized coal and natural gas.

[0025] Further, in step S5, the sulfurizing agent is selected from pyrite or copper-nickel concentrate.

[0026] Further, in step S5, the first converting slag is fed into the matte smelting furnace in a high-temperature molten state for matte smelting, and the second converting slag is cooled, crushed and then fed into the matte smelting furnace in a solid state for matte smelting.

[0027] Further, in step S6, the third converting furnace is selected from an oxygen bottom-blown furnace or a PS converter.

[0028] Further, in step S6, the third converting slag is used as return material and fed into the matte smelting furnace in a high-temperature molten state.

[0029] Further, in step S6, by volume percentage, the oxygen content in the oxygen-enriched air is 25% - 35%.

[0030] Applying the technical solution of the present invention, high-purity copper metal is obtained through smelting, the first converting (i.e., continuous converting), the second converting, fire refining, and electrolytic refining, and the recovery of nickel elements and platinum group metals (PGM) is realized. A second converting (i.e., deep converting) is added between the first converting and fire refining to further remove nickel elements in the crude copper, so that the nickel elements enter the second converting slag, further reducing the nickel element content in the anode copper of subsequent fire refining, and improving the recovery rates of metallic copper, platinum group metals, and subsequent high-sulfur nickel; at the same time, the matte smelting furnace is used to matte the first converting slag generated by continuous converting and the second converting slag generated by deep converting, so as to recover nickel metal elements and platinum group metals in the slag. The low-nickel matte obtained by matte smelting the slag is further blown to obtain high-nickel matte, and the depleted slag obtained by matte smelting the slag is sent to the slag beneficiation system for further beneficiation and recovery to obtain a slag concentrate containing copper elements, nickel elements, and platinum group metals and used as return material to be re-supplied to the smelting furnace, reducing resource waste, realizing the high-yield recovery of nickel metal elements and platinum group metals, and improving the economic benefits of smelting enterprises. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The accompanying drawings forming a part of this application are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0032] Figure 1 The flow schematic diagram of the treatment method for copper-nickel concentrate rich in platinum group metals according to an embodiment of the present invention is shown;

[0033] Figure 2 The flow schematic diagram of the treatment method for copper-nickel concentrate rich in platinum group metals according to another embodiment of the present invention is shown. Detailed implementation manners

[0034] It should be noted that, without conflict, the embodiments in this application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the drawings and in combination with the embodiments.

[0035] As described in the background art, in the smelting process of copper-nickel concentrate rich in platinum group metals in the prior art, there is a problem of low recovery rates of nickel metal elements and platinum group metals. To solve the above problems, as Figure 1 and Figure 2 shown, according to one aspect of the present invention, a treatment method for copper-nickel concentrate rich in platinum group metals is provided, including the following steps:

[0036] Step S1: Feed the copper-nickel concentrate rich in platinum group metals and a first flux into a smelting furnace, and introduce a first oxygen-rich gas for smelting to obtain copper matte and smelting slag; feed the smelting slag into a first slag beneficiation system for beneficiation to obtain a first slag tailing and a first slag concentrate containing copper elements, nickel elements and platinum group metals; use the first slag concentrate as return material and supply it to the smelting furnace; wherein, the smelting temperature is 1150°C to 1350°C;

[0037] Step S2: Continuously feed the copper matte and a second flux into a first converting furnace, and continuously introduce a second oxygen-rich gas for the first converting to obtain blister copper and a first converting slag; wherein, the temperature of the first converting is 1200°C to 1300°C; calculated by volume percentage, the oxygen concentration in the second oxygen-rich gas is 21% to 35%;

[0038] Step S3: Feed the blister copper and a third flux into an oxygen inclined-blow rotary converter, and introduce oxygen for the second converting to obtain crude copper and a second converting slag; wherein, the temperature of the second converting is 1200°C to 1350°C;

[0039] Step S4: Feed the crude copper into an anode refining furnace, and introduce air and a first reducing agent for pyrometallurgical refining to obtain copper liquid; cast the copper liquid into anode plates, and perform electrolytic refining on the anode plates to obtain cathode plates on which metallic copper is deposited, electrolytic solution containing nickel ions and anode slime containing platinum group metals; wherein, the pyrometallurgical refining temperature is 1150°C to 1350°C;

[0040] Step S5, sending the first blowing slag, the second blowing slag, the second reducing agent and the sulfiding agent into the depletion electric furnace for slag depletion to obtain low-nickel matte and depleted slag; sending the depleted slag to the second slag beneficiation system for beneficiation to obtain second slag tailings and second slag concentrate containing copper, nickel and platinum group metals; the temperature of slag depletion is 1200° C. to 1400° C.;

[0041] Step S6, feeding the low-nickel matte into the third blowing furnace, and introducing air or oxygen-enriched air for the third blowing to obtain high-nickel matte and the third blowing slag; using the slag concentrate as return material to the smelting furnace; using the third blowing slag as return material to the depletion electric furnace; wherein the temperature of the third blowing is 1250°C to 1300°C.

[0042] During the high-temperature smelting process, copper, nickel and other metal elements in the copper concentrate form copper matte (wherein, copper matte is mainly composed of copper and nickel sulfides), and impurity metal elements such as iron, lead, and zinc mainly form metal oxides and enter the smelting slag. Due to their high melting point and affinity for sulfur, most of the platinum group metals will enter the copper matte, and a small part will be mixed in the smelting slag in the form of metal. The generated copper matte can be further processed to recover copper, nickel and platinum group metals. A small amount of copper, nickel and platinum group metals in the smelting slag can be recovered through the first slag beneficiation system and resupplied to the smelting furnace as return materials to reduce resource waste.

[0043] During the first blowing (continuous blowing), the copper matte is oxidized to remove impurity elements such as iron and sulfur, and the blowing conditions (blowing temperature and the concentration of oxygen in the second oxygen-rich gas) are controlled to reduce the oxidation of nickel in the copper matte, thereby reducing the amount of high-melting-point nickel oxide with strong adhesion, so as to effectively separate the raw copper product and the first blowing slag, improve the recovery rate of metallic copper, platinum group metals and subsequent high-nickel matte, and improve production efficiency. As a result, the copper content in the raw copper produced is increased and contains a certain amount of nickel, and most of the platinum group metals enter the raw copper, and part of the nickel, copper, platinum group metals and impurity sulfur, iron, etc. are removed and enter the first blowing slag in a molten state (for example, copper and nickel enter the first blowing slag in the form of oxides and sulfides, and platinum group metals are mixed in the first blowing slag in the form of metals).

[0044] During the second smelting (deep smelting) process, raw blister copper is deeply smelted in an oxygen inclined-blow rotary converter. The oxygen inclined-blow rotary converter has good heat and mass transfer characteristics. Its special structure results in less influence of slag adhesion on the smelting of the furnace, and it has a good nickel removal effect. By introducing oxygen to control the oxygen potential and controlling the deep smelting temperature, nickel in copper can be deeply removed, making its content meet the requirements of subsequent pyrometallurgical refining and electrolytic refining. Nickel is oxidized and enters the second smelting slag (dry slag) as a solid oxide, realizing the separation of copper and nickel. As a result, the nickel element content in the produced blister copper is reduced to less than 0.6%, which can meet the nickel content requirements for subsequent pyrometallurgical refining in the anode furnace. At the same time, the produced second smelting slag rich in nickel can be used for slag impoverishment to further recover nickel, copper, and platinum group metals.

[0045] The blister copper is further pyrometallurgically refined in the anode refining furnace. The blister copper is heated to a high temperature in the anode refining furnace. Under the supply of oxygen, impurities such as sulfur (S), iron (Fe), lead (Pb), bismuth (Bi), arsenic (As), and antimony (Sb) are oxidized into oxides to remove impurities. During the reduction period of pyrometallurgical refining, some oxidized copper is reduced back to the metallic state from the oxide state by introducing reducing agents (such as natural gas, coal, etc.), reducing the loss of copper metal. After pyrometallurgical refining, it is further purified by electrolytic refining. The copper metal in the anode plate is deposited on the cathode plate, nickel metal dissolves into the electrolyte, and platinum group metals enter the anode slime, thus realizing the separation and recovery of the three. Among them, the cathode plate deposited with metallic copper can be directly sold as a product, and the anode slime is used to further extract and recover platinum group metals through precious and rare metal extraction.

[0046] Slag impoverishment is to use a reducing agent to react with metal oxides in the slag at high temperature to reduce the metal oxides to the metallic state. During the slag impoverishment process, the metal components in the first smelting slag and the second smelting slag are reduced by the reduction reaction in the impoverishment electric furnace, and nickel metal elements are reduced into low nickel matte, providing raw materials for the subsequent production of high nickel matte. Part of the platinum group metals in the low nickel matte enter the high nickel matte with nickel elements, and the other part of the platinum group metals, a small amount of nickel elements, copper elements, impurity metal elements (aluminum, iron), and non-metallic elements (Si) form impoverishment slag. After the platinum group metals, nickel elements, and copper elements in the impoverishment slag are recovered by subsequent ore dressing, they are used as return materials and re-supplied to the smelting furnace to reduce resource waste.

[0047] The low nickel matte is subjected to the third smelting (i.e., nickel matte smelting) in the third smelting furnace. Through oxidation and matte-making reactions, part of the impurities are removed to obtain high nickel matte and smelting slag. As a result, the produced high nickel matte has a high nickel element content and can be directly sold or further processed. For example, the high nickel matte can be obtained by oxidative leaching to get the product nickel sulfate and separated from platinum group metals and copper.

[0048] The treatment method of copper-nickel concentrate rich in platinum group metals based on the present invention obtains high-purity copper metal through smelting, the first converting (i.e., continuous converting), the second converting, fire refining, and electrolytic refining, and realizes the recovery of nickel elements and platinum group metals (PGM). A second converting (i.e., deep converting) is added between the first converting and the fire refining to further remove nickel elements in the crude copper, so that the nickel elements enter the second converting slag, further reducing the nickel element content in the anode copper of the subsequent fire refining, and improving the recovery rates of metallic copper, platinum group metals, and subsequent high-sulfur nickel; at the same time, the first converting slag generated by continuous converting and the second converting slag generated by deep converting are subjected to slag impoverishment by a depleting electric furnace to recover nickel metal elements and platinum group metals in the slag. The low-nickel matte obtained by slag impoverishment is further converted to obtain high-nickel matte, and the depleted slag obtained by slag impoverishment is sent to a slag beneficiation system for further beneficiation recovery to obtain a slag concentrate containing copper elements, nickel elements, and platinum group metals and used as return material to be re-supplied to the smelting furnace, reducing resource waste, realizing the high-yield recovery of nickel metal elements and platinum group metals, and improving the economic benefits of smelting enterprises.

[0049] In some embodiments, in step S1, the smelting furnace is selected from an oxygen-enriched side-blown furnace or an oxygen bottom-blown furnace.

[0050] Adopting the technical solution in the embodiment of the present invention, during the smelting process, the metal elements in the copper-nickel concentrate rich in platinum group metals combine with sulfur to form copper matte, and at the same time, the impurity metal elements are oxidized into the smelting slag. Since nickel is more easily oxidized than copper, nickel elements mainly exist in the form of oxides in the smelting slag. The oxygen-enriched side-blown furnace blows the first oxygen-enriched gas into the furnace from the lance on the furnace wall, while the oxygen bottom-blown furnace supplies oxygen from the bottom lance to blow in the first oxygen-enriched gas. The above two smelting furnaces can more precisely control the oxygen potential and temperature, thereby more precisely controlling the oxidation degree in the smelting slag, making more nickel in the copper concentrate enter the copper matte, improving the recovery rates of copper metal elements and nickel metal elements, and reducing energy consumption.

[0051] In one embodiment, in step S1, the smelting furnace is selected from an oxygen-enriched side-blown furnace.

[0052] In some embodiments, in step S1, calculated by volume percentage, the concentration of oxygen in the first oxygen-enriched gas is 70% - 85%.

[0053] Adopting the technical solution in the embodiment of the present invention, the above oxygen concentration is beneficial to making more nickel in the copper concentrate enter the copper matte, and improving the recovery rates of copper metal elements and nickel metal elements.

[0054] In some embodiments, in order for nickel and copper to enter more, and improve the recovery rates of copper metal elements and nickel metal elements, in step S1, calculated by mass ratio, the iron-silicon ratio (Fe / SiO2) in the smelting slag is (1.2 - 1.8):1.

[0055] In one embodiment, in step S1, the smelting slag is slowly cooled and crushed and then fed into the first slag beneficiation system for beneficiation. The smelting slag is slowly cooled and crushed and then fed into the first slag beneficiation system, and slag concentrates containing copper, nickel and platinum group metals are recovered through beneficiation.

[0056] In some embodiments, in step S2, the first converter is selected from a multi-gun top-blown converter, an oxygen bottom-blown converter or a PS converter.

[0057] By adopting the technical solution in the embodiment of the present invention, the copper matte can be further blown and refined through both the multi-gun top-blown converter and the oxygen bottom-blown converter to remove sulfur and other impurities therein, and crude copper is formed.

[0058] In one embodiment, in step S2, the first converter is selected from an oxygen bottom-blown converter.

[0059] By adopting the technical solution in the embodiment of the present invention, compared with the calcium slag used in the multi-gun top-blown converter, the oxygen bottom-blown converter uses silica slag for continuous blowing, which is beneficial to the removal of iron elements during the continuous blowing process. The content of copper element in the first blown slag obtained by continuous blowing with the oxygen bottom-blown converter is relatively low, which can reduce the amount of copper element brought into the matte smelting furnace and improve the recovery rate of copper metal in electrolytic refining.

[0060] In some embodiments, in step S2, the second flux is selected from one or both of quartzite and quartz sand, and quartzite is preferred.

[0061] By adopting the technical solution in the embodiment of the present invention, quartzite is used as a flux. SiO2 in the quartzite can reduce the viscosity of the first blown slag, which helps to obtain the first blown slag with good fluidity, making it easier to separate from the metal phase and reducing the loss of metal in the slag; and by using silica slag, iron is more easily oxidized and combined with silicate to form compounds that are easy to remove, which is beneficial to the removal of iron elements during the continuous blowing process and is also beneficial to the subsequent slag impoverishment of the first blown slag to recover nickel elements, thereby increasing the removal rate of nickel elements and reducing the residue of nickel elements in the crude copper. In addition, the silica slag can form a protective layer to reduce corrosion and also helps to improve the service life of the furnace lining.

[0062] In one embodiment, the flux is selected from quartzite. Using quartzite as a flux is more beneficial to nickel removal during the continuous blowing process and subsequent slag impoverishment of the electric furnace slag to recover nickel elements, reducing the residue of nickel elements in the crude copper and the recovery rate of nickel elements during the slag impoverishment process.

[0063] In some embodiments, in order to obtain a crude copper with a high yield, in step S2, by mass ratio, the iron-silica ratio (Fe / SiO2) of the first blown slag is (1.0 - 1.4):1.

[0064] In some embodiments, in order to obtain crude copper with a high yield and reduce energy consumption, in step S3, the time of the second smelting is 1 h to 3 h.

[0065] In one embodiment, the copper matte flows into the first smelting furnace through the second launder. Transferring the copper matte from the smelting furnace to the smelting furnace through the launder can achieve continuous transportation of the hot metal liquid, avoid the cooling and remelting processes, reduce energy loss, and also reduce the oxidation of the metal liquid during the transfer process, which is beneficial to maintaining the quality of the metal liquid.

[0066] In some embodiments, in step S3, the third flux is selected from one or two of quartz stone and quartz sand.

[0067] In some embodiments, in order to obtain crude raw copper with a high yield, in step S3, by mass ratio, the copper-silicon ratio (Cu / SiO2) in the second smelting slag is (0.6 - 1.0):1.

[0068] In some embodiments, in step S4, the pyrometallurgical refining uses a rotary anode refining furnace.

[0069] Adopting the technical solution in the embodiment of the present invention, the pyrometallurgical refining can further purify the crude copper produced by the first smelting furnace to remove impurities therein, so as to obtain high-grade anode copper that meets the requirements of electrolytic refining. The working principle of the rotary anode refining furnace is based on oxidation-reduction reactions and physical separation. The furnace maintains a high-temperature state. By rotating the furnace body and injecting air through the oxidation-reduction lance, the crude copper content is increased, and the oxidation of impurities in the crude copper is promoted. After the impurities are oxidized, a slag phase is formed and separated from the copper phase. Then, the gas is switched, and the air is switched to the first reducing agent such as natural gas to enter the reduction period, and the Cu2O generated by oxidation in the oxidation period is reduced to copper, thereby realizing the pyrometallurgical refining of the crude copper.

[0070] In some embodiments, in step S4, the first reducing agent is selected from one or two of natural gas, coal, etc., and preferably natural gas. Using natural gas as the reducing agent is clean and environmentally friendly.

[0071] In some embodiments, in step S5, the second reducing agent is injected into the de-siliconizing electric furnace through a side-blown lance.

[0072] Adopting the technical solution in the embodiment of the present invention, injecting the reducing agent into the de-siliconizing electric furnace through the side-blown lance is beneficial to fully reducing the valuable metals in the first smelting slag and the second smelting slag and reducing the nickel element content in the de-siliconizing slag.

[0073] In some embodiments, the second reducing agent is selected from one or more of pulverized coal and natural gas, which is beneficial to the full reduction of valuable metals in the smelting slag.

[0074] In some embodiments, in step S5, the sulfiding agent is selected from pyrite or copper-nickel concentrate.

[0075] The purpose of adding pyrite or copper-nickel concentrate is to introduce sulfur in order to produce matte rather than nickel-iron alloy. Matte has a relatively low temperature, the operating temperature can be reduced, and through further converting later, high-grade matte can be obtained, with high product value. Specifically, the copper-nickel concentrate can be a copper-nickel concentrate rich in platinum group metals in the raw materials.

[0076] In some embodiments, in step S5, the first converting slag is fed into the cleaning electric furnace in a high-temperature molten state for cleaning, and the second converting slag is cooled, crushed and then fed into the cleaning electric furnace in a solid state for cleaning.

[0077] Adopting the technical solution in the embodiment of the present invention, the first converting slag and the second converting slag respectively come from the continuous converting of copper matte and the deep converting of blister copper. There are fewer high-melting-point substances such as nickel oxide in the first converting slag, and the first converting slag is in a molten state. Feeding it into the cleaning electric furnace in a hot state for cleaning can make full use of the heat in the first converting slag and avoid the energy loss caused by the cooling and reheating of the first converting slag; at the deep converting temperature, the slag has a high viscosity and forms dry slag. Therefore, the second converting slag is in a solid state and contains more quartz and oxides (for example, high-melting-point nickel oxide with strong adhesiveness). Cooling and crushing it first and then feeding it into the electric furnace is beneficial to reducing the adhesion problem in the molten state and facilitating the smooth progress of the slag cleaning process.

[0078] In one embodiment, the cleaning electric furnace includes a cleaning area and a settling area inside the furnace body. The settling area is located below the cleaning area. The cleaning area is provided with a first converting slag inlet, a second converting slag inlet and a sulfiding agent inlet, and the first converting slag inlet is connected to a first chute for receiving the first converting slag.

[0079] The cleaning electric furnace adopts a two-stage design of a cleaning area and a settling area. Among them, the cleaning area is the main area for chemical reactions in the electric furnace. Its main function is to reduce metal elements in the form of sulfides through a reducing agent or a sulfiding agent to form matte, and at the same time convert elements that are not desired to exist in the matte (such as sulfur, phosphorus, etc.) into slag cleaning slag, thereby cleaning these impurity elements and increasing the content of nickel metal elements in the matte. In the cleaning area, the raw materials react under high temperature and reducing atmosphere to form matte and cleaning slag. The settling area is located at the lower part of the electric furnace, and its main function is to allow gravitational settling separation between the matte and the cleaning slag. The matte generated in the cleaning area has a relatively large density, while the cleaning slag is usually light and viscous. The settling area provides space and time so that the metal melt can sink to the furnace bottom, while the cleaning slag floats on the metal melt, achieving good separation of the two.

[0080] In some embodiments, in step S6, the third converting furnace is selected from an oxygen bottom-blown furnace or a PS converter, preferably an oxygen bottom-blown furnace.

[0081] Adopting the technical solution in the embodiment of the present invention, in the oxygen bottom-blown furnace, an oxygen-rich gas (such as air) is blown into the molten matte through a lance at the furnace bottom to promote the oxidation of impurities such as iron and sulfur therein to form a slag phase, which is separated from the matte phase, thereby improving the purity and grade of the nickel matte product. Moreover, the use of the bottom-blown furnace for smelting can reduce the escape of SO2, and has good environmental protection effects.

[0082] In one embodiment, in step S5, the depleted slag is slowly cooled, crushed and then sent to the second slag beneficiation system. The depleted slag contains a small amount of metal elements with recovery value, such as metal elements such as copper, nickel and PGM. Slow cooling is beneficial to maintaining the dispersed state of the metal elements in the slag material, making it easier to separate during crushing. Crushing the slowly cooled depleted slag can increase the surface area of the slag material, which is beneficial to subsequent beneficiation to recover copper, nickel and PGM elements therein through physical or chemical methods, can effectively improve the recovery rate of metal elements and reduce energy consumption.

[0083] In one embodiment, the first beneficiation system and the second beneficiation system can respectively adopt existing copper smelting slag beneficiation systems and copper smelting slag flotation reagents.

[0084] In one embodiment, the first ore dressing system includes a crushing device, a screening device, a grinding device, a classification device, a first-stage flotation device, a regrinding device for the first-stage flotation tailings, a second-stage flotation device, a metal concentrate thickening and filtering device, and a second-stage flotation tailings thickening and filtering device. For example, the crushing device may include a mobile hydraulic crusher and a jaw crusher, the grinding device may include a semi-autogenous mill, the classification device may include a first hydrocyclone, and the regrinding device for the first-stage flotation tailings may include a ball mill and a second hydrocyclone; the first-stage flotation reagents in the first-stage flotation device and the second-stage flotation reagents in the second-stage flotation device both respectively include isopentyl sodium xanthate, No. 2 oil, and Z-200. Specifically, the ore dressing process may include the following steps: (a) Raw material pretreatment: The raw materials are successively crushed by a mobile hydraulic crusher and a jaw crusher, and then the cooled smelting slag is successively processed by a screening device to obtain a finely crushed product smaller than 250 mm; (b) Grinding and classification: The finely crushed product is successively ground by a semi-autogenous mill, and then classified by a first hydrocyclone. The sand is returned to the semi-autogenous mill to form a first-stage closed-circuit grinding, and the overflow pulp enters the first-stage flotation device; (c) First-stage flotation: The first-stage flotation device performs first-stage flotation on the overflow pulp. The first-stage flotation concentrate enters the metal concentrate thickening and filtering device as the concentrate product, and the first-stage flotation tailings flow by gravity to the second-stage grinding pump sump; (d) Regrinding of the first-stage flotation tailings: A second-stage closed-circuit grinding is formed by a ball mill and a hydrocyclone, and the overflow pulp enters the second-stage flotation device; (e) Second-stage flotation: The second-stage flotation device performs second-stage flotation on the overflow pulp. The second-stage flotation concentrate is merged with the first-stage flotation concentrate and then enters the metal concentrate thickening and filtering device. After thickening and dewatering, a metal concentrate (i.e., the first slag concentrate) is obtained. The second-stage flotation tailings pass through the second-stage flotation tailings thickening and filtering device, and after thickening and dewatering, slag tailings (i.e., the first slag tailings) are obtained.

[0085] By adopting the technical solution in the embodiment of the present invention, after ore dressing by the first ore dressing system, the metal concentrate (the first slag concentrate containing copper, nickel, and platinum group metals) recovered from the smelting slag can be supplied as a return material to the smelting furnace and can be added to the smelting furnace again for subsequent treatment, thereby improving the total recovery rates of copper, nickel, and platinum group metals and the recycling utilization rate of resources.

[0086] In one embodiment, the second ore dressing system includes a crushing device, a screening device, a grinding device, a classification device, a first-stage flotation device, a regrinding device for the first-stage flotation tailings, a second-stage flotation device, a metal concentrate thickening and filtering device, and a second-stage flotation tailings thickening and filtering device. For example, the crushing device may include a mobile hydraulic crusher and a jaw crusher, the grinding device may include a semi-autogenous mill, the classification device may include a first hydrocyclone, and the regrinding device for the first-stage flotation tailings may include a ball mill and a second hydrocyclone; the first-stage flotation reagents in the first-stage flotation device and the second-stage flotation reagents in the second-stage flotation device both respectively include isopentyl sodium xanthate, No. 2 oil, and Z-200.

[0087] Adopting the technical solution in the embodiment of the present invention, after beneficiation treatment by the second beneficiation system, the metal concentrate recovered from the depleted slag (the second slag concentrate containing copper element, nickel element and platinum group metals) can be supplied as return material to the smelting furnace and can be added to the smelting furnace again for subsequent treatment, thereby improving the total recovery rate of copper element, nickel element and platinum group metals and the recycling utilization rate of resources.

[0088] In some embodiments, in step S6, the third converting slag is used as return material and supplied to the depletion electric furnace in a high-temperature molten state.

[0089] Adopting the technical solution in the embodiment of the present invention, the third converting slag is further treated by the depletion electric furnace to recover nickel element, copper element and platinum group metals therein, and reduce the content of metal elements in the slag. In addition, directly supplying the third converting slag in a high-temperature molten state (hot state) can optimize the reduction conditions inside the depletion electric furnace, reduce the residual nickel metal element in the depleted slag, and improve the depletion effect. Moreover, directly supplying the third converting slag to the depletion electric furnace in a hot state can recover and utilize this part of heat energy, reduce the external energy consumption required for heating materials in the depletion electric furnace, and improve the energy utilization efficiency of the entire process flow.

[0090] In some embodiments, in step S6, by volume percentage, the oxygen content in the oxygen-enriched air is 25% - 35%, with low cost and high nickel matte recovery rate.

[0091] The following further describes the present application in detail with specific embodiments, and these embodiments should not be construed as limiting the scope claimed by the present application.

[0092] Example 1

[0093] Step 1: Feed the copper-nickel concentrate rich in platinum group metals and the first flux into the oxygen-enriched side-blown furnace, and introduce the first oxygen-enriched gas for smelting to obtain copper matte and smelting slag; feed the smelting slag into the first slag beneficiation system for beneficiation to obtain the first slag tailings and the first slag concentrate containing copper element, nickel element and platinum group metals; use the first slag concentrate as return material and supply it to the oxygen-enriched side-blown furnace, and the first slag tailings are used for external sales.

[0094] Among them, the first beneficiation system includes crushing equipment, screening equipment, grinding equipment, classification equipment, first-stage flotation equipment, re-grinding equipment for first-stage flotation tailings, second-stage flotation equipment, metal concentrate thickening and filtering equipment, and thickening and filtering equipment for second-stage flotation tailings. The crushing equipment includes a mobile hydraulic crusher and a jaw crusher. The grinding equipment includes a semi-autogenous mill. The classification equipment includes a first hydrocyclone. The re-grinding equipment for first-stage flotation tailings includes a ball mill and a second hydrocyclone; The first-stage flotation reagents in the first-stage flotation equipment and the second-stage flotation reagents in the second-stage flotation equipment both respectively include isoamyl sodium xanthate, No. 2 oil, and Z-200. For the first-stage flotation reagents and the second-stage flotation reagents, the dosage of isoamyl sodium xanthate is respectively added at 110 g per ton of smelting slag, the dosage of No. 2 oil is respectively added at 100 g per ton of smelting slag, and the dosage of Z-200 is respectively added at 80 g per ton of smelting slag;

[0095] The smelting temperature is 1320 °C. By volume percentage, the oxygen concentration in the first enriched oxygen gas is 80%. The first flux is quartzite (where the SiO2 content is 92%); By mass ratio, the iron-silica ratio (Fe / SiO2) in the smelting slag is 1.6:1;

[0096] In the copper-nickel concentrate rich in platinum group metals, the weight percentage content of Cu element is 26%, the weight percentage content of Ni element is 1.8%, and the content of PGM per ton of copper-nickel concentrate rich in platinum group metals is 52 g;

[0097] The grade of matte is 65% (that is, the weight percentage content of Cu element and Ni element in matte is 65%). The weight percentage content of platinum group metals in matte is 122 g / t;

[0098] In the smelting slag, the weight percentage content of Cu element is 1.20%, the weight percentage of Ni element is 0.40%, and the weight percentage content of platinum group metals is 9 g / t.

[0099] In step two, the matte is continuously fed into the first oxygen bottom-blown furnace through a launder, the second flux is continuously added to the first oxygen bottom-blown furnace, and the second enriched oxygen gas is continuously introduced for continuous blowing to obtain crude copper and first-blown slag.

[0100] Among them, the temperature of continuous blowing is 1280 °C. By volume percentage, the oxygen concentration in the second enriched oxygen gas is 25%; The second flux is quartzite. By mass ratio, the iron-silica ratio (Fe / SiO2) in the first-blown slag is 1.1:1;

[0101] In the crude copper, the weight percentage content of copper element is 94.00%, the weight percentage content of nickel element is 4.05%, and the weight percentage content of platinum group metals is 217 g / t;

[0102] In the first smelting slag, the weight percentage content of Cu element is 8%, the weight percentage content of Ni element is 3.73%, and the weight percentage content of platinum group metals is 5 g / t.

[0103] Step 3: Transport the raw blister copper and the third flux into the oxygen inclined blowing rotary converter by ladle crane, and introduce oxygen for the second smelting to obtain blister copper and the second smelting slag.

[0104] Among them, the temperature of the second smelting is 1300 °C, and the time of the second smelting is 2 h; the third flux is quartzite (where the SiO2 content is 92%); by mass ratio, the copper-silicon ratio (Cu / SiO2) in the second smelting slag is 0.8:1.

[0105] In the blister copper, the weight percentage content of Cu is 98.80%, the weight percentage content of Ni element is 0.50%, and the content of platinum group metals is 237 g / t.

[0106] In the second smelting slag, the weight percentage content of Cu element is 28.00%, the weight percentage content of Ni element is 21.54%, and the content of platinum group metals is 13 g / t.

[0107] Step 4: Transport the blister copper into the rotary anode refining furnace by ladle crane, and introduce air and natural gas for pyrometallurgical refining to obtain copper liquid. Then, cast the copper liquid into anode plates through a disk casting machine, and then electrolytically refine the anode plates. The copper metal in the anode plates is deposited on the cathode plates, the nickel metal dissolves into the electrolyte, and the platinum group metals enter the anode slime, obtaining cathode plates with deposited metallic copper, electrolyte containing nickel ions, and anode slime containing platinum group metals.

[0108] Among them, the pyrometallurgical refining temperature is 1250 °C.

[0109] In the anode plates, the weight percentage content of Cu is 98.90%, the weight percentage content of Ni is 0.40%, and the content of platinum group metals is 237 g / t.

[0110] Step 5: Feed the first smelting slag into the copper-smelting electric furnace in a hot state through a chute, cool and crush the second smelting slag and then feed it into the copper-smelting electric furnace. Add pyrite as a sulfiding agent and coal as a reducing agent to the copper-smelting electric furnace for slag impoverishment to obtain low-grade nickel matte and impoverished slag; send the impoverished slag to the second slag beneficiation system for beneficiation to obtain second slag tailings and second slag concentrate containing copper element, nickel element, and platinum group metals; use the second slag concentrate as return material to supply to the oxygen-enriched side-blown furnace for smelting, and sell the second slag tailings externally.

[0111] Among them, the second ore dressing system includes crushing equipment, screening equipment, grinding equipment, classification equipment, first-stage flotation equipment, regrinding equipment for the tailings of the first-stage flotation, second-stage flotation equipment, metal concentrate thickening and filtering equipment, and thickening and filtering equipment for the tailings of the second-stage flotation. For example, the crushing equipment includes a mobile hydraulic crusher and a jaw crusher, the grinding equipment includes a semi-autogenous mill, the classification equipment includes a first hydrocyclone, and the regrinding equipment for the tailings of the first-stage flotation includes a ball mill and a second hydrocyclone; the first-stage flotation reagents in the first-stage flotation equipment and the second-stage flotation reagents in the second-stage flotation equipment both respectively include isoamyl sodium xanthate, No. 2 oil, and Z-200. For the first-stage flotation reagents and the second-stage flotation reagents, the dosage of isoamyl sodium xanthate is respectively added at 110 g per ton of depleted slag, the dosage of No. 2 oil is respectively added at 100 g per ton of depleted slag, and the dosage of Z-200 is respectively added at 80 g per ton of depleted slag;

[0112] The temperature of slag depletion is 1300 °C;

[0113] In the matte, the weight percentage content of Cu element is 33.63%, the weight percentage content of Ni element is 22.06%, and the content of platinum group metals is 3 g / t;

[0114] In the depleted slag, the weight percentage content of Cu element is 0.80%, the weight percentage content of Ni element is 0.14%, and the content of platinum group metals is 8 g / t.

[0115] Step S6: Transport the matte into the second oxygen bottom-blown furnace by a ladle crane and introduce air for the third blowing to obtain high-grade nickel matte and the third blowing slag; granulate the high-grade nickel matte by air crushing and sell it externally, and use the third blowing slag as return material and supply it to the depletion electric furnace in a hot state by a ladle;

[0116] Among them, the temperature of the third blowing is 1250 °C;

[0117] In the high-grade nickel matte, the weight percentage content of Cu element is 43.54%, the weight percentage content of Ni element is 29.11%, the weight percentage content of Fe element is 5.00%, and the content of platinum group metals is 3.46 g / t;

[0118] In the third blowing slag, the weight percentage content of Cu element is 2.99%, the weight percentage content of Ni element is 1.00%, and the weight percentage content of platinum group metals is 0.55 g / t.

[0119] Example 2

[0120] Step 1: Feed copper-nickel concentrate rich in platinum group metals and the first flux into an oxygen-enriched side-blown furnace, and introduce the first oxygen-enriched gas for smelting to obtain copper matte and smelting slag; Feed the smelting slag into the first slag beneficiation system for beneficiation to obtain the first slag tailings and the first slag concentrate containing copper, nickel, and platinum group metals; Use the first slag concentrate as return material and supply it to the oxygen-enriched side-blown furnace, and sell the first slag tailings externally.

[0121] Among them, the first slag beneficiation system is the same as that in Example 1;

[0122] The smelting temperature is 1250 °C. By volume percentage, the oxygen concentration in the first oxygen-enriched gas is 70%, and the first flux is quartzite (with a SiO2 content of 92%); By mass ratio, the iron-silicon ratio (Fe / SiO2) in the smelting slag is 1.5:1;

[0123] Step 2: Continuously feed the copper matte into the first oxygen bottom-blown furnace through a launder, continuously add the second flux to the first oxygen bottom-blown furnace, and continuously introduce the second oxygen-enriched gas for continuous blowing to obtain blister copper and the first blowing slag.

[0124] Among them, the temperature of continuous blowing is 1260 °C. By volume percentage, the oxygen concentration in the second oxygen-enriched gas is 24%; The second flux is quartzite. By mass ratio, the iron-silicon ratio in the first blowing slag is 1.0:1;

[0125] Step 3: Transport the blister copper and the third flux to an oxygen inclined-blown rotary converter by ladle, and introduce oxygen for the second blowing to obtain crude copper and the second blowing slag;

[0126] Among them, the temperature of the second blowing is 1250 °C, and the time of the second blowing is 2 h; The third flux is quartzite (with a SiO2 content of 92%); By mass ratio, the copper-silicon ratio (Cu / SiO2) in the second blowing slag is 0.6:1

[0127] Step 4: Transport the crude copper to a rotary anode refining furnace by ladle, and introduce air and natural gas for pyrometallurgical refining to obtain copper liquid. Then, cast the copper liquid into anode plates through a disk casting machine. Then, electrolytically refine the anode plates. The copper metal in the anode plates deposits on the cathode plates, the nickel metal dissolves into the electrolyte, and the platinum group metals enter the anode slime, obtaining cathode plates with deposited metallic copper, electrolyte containing nickel ions, and anode slime containing platinum group metals;

[0128] Among them, the pyrometallurgical refining temperature is 1250 °C.

[0129] Step 5: Feed the first smelting slag into the matte smelting furnace in a hot state through a chute, cool and crush the second smelting slag and then feed it into the matte smelting furnace. Add pyrite as a sulfidizing agent and coal as a reducing agent into the matte smelting furnace for slag matte smelting to obtain low nickel matte and depleted slag. Send the depleted slag to the second slag beneficiation system for beneficiation to obtain the second slag tailings and the second slag concentrate containing copper, nickel and platinum group metals. Use the second slag concentrate as return material and supply it to the oxygen-enriched side-blown furnace for smelting, and sell the second slag tailings externally.

[0130] Among them, the second slag beneficiation system is the same as that in Example 1;

[0131] The temperature of slag matte smelting is 1250 °C;

[0132] Step S6: Transport the low nickel matte into the second oxygen bottom-blown furnace by ladle suspension, and introduce air for the third smelting to obtain high nickel matte and the third smelting slag. Granulate the high nickel matte by air crushing and sell it externally, and use the third smelting slag as return material and supply it to the matte smelting furnace in a hot state by ladle;

[0133] Among them, the temperature of the third smelting is 1280 °C;

[0134] Example 3

[0135] Step 1: Feed the copper-nickel concentrate rich in platinum group metals and the first flux into the oxygen-enriched side-blown furnace, and introduce the first oxygen-enriched gas for smelting to obtain copper matte and smelting slag. Send the smelting slag to the first slag beneficiation system for beneficiation to obtain the first slag tailings and the first slag concentrate containing copper, nickel and platinum group metals. Use the first slag concentrate as return material and supply it to the oxygen-enriched side-blown furnace, and sell the first slag tailings externally.

[0136] Among them, the first slag beneficiation system is the same as that in Example 1;

[0137] The smelting temperature is 1350 °C. By volume percentage, the oxygen concentration in the first oxygen-enriched gas is 85%, and the first flux is quartzite (SiO2 content 92%); By mass ratio, the iron-silica ratio (Fe / SiO2) in the smelting slag is 1.7:1.

[0138] Step 2: Continuously feed the copper matte into the first oxygen bottom-blown furnace through a chute, continuously add the second flux to the first oxygen bottom-blown furnace, and continuously introduce the second oxygen-enriched gas for continuous smelting to obtain crude copper and the first smelting slag.

[0139] Among them, the temperature of continuous smelting is 1300 °C. By volume percentage, the oxygen concentration in the second oxygen-enriched gas is 30%; The second flux is quartzite. By mass ratio, the iron-silica ratio in the first smelting slag is 1.2:1.

[0140] Step 3: Transport the raw blister copper and the third flux into the oxygen inclined blowing rotary converter by ladle crane, and introduce oxygen for the second smelting to obtain blister copper and the second smelting slag;

[0141] Among them, the temperature of the second smelting is 1350 °C, and the time of the second smelting is 2 h; the third flux is quartzite (SiO2 content is 92%); calculated by mass ratio, the copper-silicon ratio (Cu / SiO2) in the second smelting slag is 1:1;

[0142] Step 4: Transport the blister copper to the rotary anode refining furnace by ladle crane, and introduce air and natural gas for pyrometallurgical refining to obtain copper liquid. Then, cast the copper liquid into anode plates through a disk casting machine, and then electrolytically refine the anode plates. The copper metal in the anode plates is deposited on the cathode plates, the nickel metal is dissolved into the electrolyte, and the platinum group metals enter the anode slime, obtaining cathode plates with deposited metallic copper, electrolyte containing nickel ions, and anode slime containing platinum group metals;

[0143] Among them, the temperature of the pyrometallurgical refining is 1250 °C.

[0144] Step 5: Feed the first smelting slag into the matte smelting electric furnace in a hot state through a chute, and feed the second smelting slag into the matte smelting electric furnace after cooling and crushing. Add pyrite as a sulfiding agent and coal as a reducing agent to the matte smelting electric furnace for slag matte smelting to obtain low-grade nickel matte and matte-smelted slag; send the matte-smelted slag to the second slag beneficiation system for beneficiation to obtain second slag tailings and second slag concentrate containing copper, nickel, and platinum group metals; use the second slag concentrate as return material and supply it to the oxygen-enriched side-blown furnace for smelting, and sell the second slag tailings externally.

[0145] Among them, the second slag beneficiation system is the same as that in Example 1;

[0146] The temperature of the slag matte smelting is 1400 °C.

[0147] Step S6: Transport the low-grade nickel matte into the second oxygen bottom-blown furnace by ladle crane, and introduce air for the third smelting to obtain high-grade nickel matte and the third smelting slag; granulate the high-grade nickel matte by air crushing and sell it externally, and use the third smelting slag as return material and supply it to the matte smelting electric furnace in a hot state through a ladle;

[0148] Among them, the temperature of the third smelting is 1250 °C.

[0149] Taking the cathode plates with deposited metallic copper, the electrolyte containing nickel ions, the anode slime containing platinum group metals, and the high-grade nickel matte as products, calculate the recovery rates of copper metal elements, nickel metal elements, and platinum group metal elements, as shown in Table 1 specifically. Among them, copper metal elements are recovered in the form of metallic copper and high-grade nickel matte, nickel metal elements are recovered in the form of electrolyte containing nickel ions and high-grade nickel matte, and platinum group metal elements are recovered in the form of anode slime containing platinum group metals and high-grade nickel matte.

[0150] Table 1. Recovery rates of copper metal elements, nickel metal elements, and platinum group metals

[0151] Example Recovery rate of copper metal element (%) Recovery rate of nickel metal element (%) Recovery rate of platinum group metals (%) Example 1 98.30 91.15 95.55 Example 2 98.20 91.00 95.45 Example 3 98.40 91.25 95.59

[0152] As can be seen from Table 1, the treatment method of copper-nickel concentrate rich in platinum group metals according to the embodiments of the present invention realizes the high-yield recovery of copper metal elements, nickel metal elements, and platinum group metals.

[0153] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A method for treating copper-nickel concentrate rich in platinum group metals, characterized in that: The steps include: Step S1, feeding the copper-nickel concentrate rich in platinum group metals and a first flux into a smelting furnace, and introducing a first oxygen-rich gas for smelting to obtain copper matte and smelting slag; feeding the smelting slag into a first slag beneficiation system for beneficiation to obtain a first slag tailing and a first slag concentrate containing copper elements, nickel elements and platinum group metals; and supplying the first slag concentrate to the smelting furnace as a return material; wherein the smelting temperature is 1150° C. to 1350° C.; Step S2, continuously feeding the copper matte and the second flux into a first blowing furnace, and continuously introducing a second oxygen-rich gas for first blowing to obtain raw copper and first blowing slag; wherein the temperature of the first blowing is 1200° C. to 1300° C.; and the concentration of oxygen in the second oxygen-rich gas is 21% to 35% by volume; Step S3, feeding the raw copper and the third flux into a second blowing furnace, and introducing oxygen for a second blowing to obtain the copper and the second blowing slag; wherein the temperature of the second blowing is 1200° C. to 1350° C.; and the second blowing furnace is an oxygen oblique blowing rotary converter; Step S4, feeding the crude copper into an anode refining furnace, and introducing air and a first reducing agent for fire refining to obtain copper liquid; casting the copper liquid into an anode plate, and electrolytically refining the anode plate to obtain a cathode plate for depositing metallic copper, an electrolyte containing nickel ions, and an anode mud containing platinum group metals; wherein the fire refining temperature is 1150° C. to 1350° C.; Step S5, sending the first blown slag, the second blown slag, the second reducing agent and the sulfiding agent into a depletion electric furnace for slag depletion to obtain low-nickel matte and depleted slag; sending the depleted slag to a second slag beneficiation system for beneficiation to obtain second slag tailings and a second slag concentrate containing copper, nickel and platinum group metals; the temperature of the slag depletion is 1200° C. to 1400° C.; Step S6, feeding the low-nickel matte into a third blowing furnace, and introducing air or oxygen-enriched air for a third blowing to obtain high-nickel matte and a third blowing slag; using the slag concentrate as a return material to the smelting furnace; using the third blowing slag as a return material to the depleted electric furnace; wherein the temperature of the third blowing is 1250°C to 1300°C.

2. The method for treating copper-nickel concentrate rich in platinum group metals according to claim 1, characterized in that: In the step S1, the smelting furnace is selected from an oxygen-enriched side-blown furnace or an oxygen bottom-blown furnace; and / or, In step S1, the concentration of oxygen in the first oxygen-rich gas is 70% to 85% by volume; and / or, In the step S1, the first flux is selected from one or both of quartz stone and quartz sand; and / or, in the step S1, the iron-silicon ratio in the smelting slag is (1.2-1.8):1 in terms of mass ratio.

3. The method for treating copper-nickel concentrate rich in platinum group metals according to claim 1, characterized in that: In the step S2, the first blowing furnace is selected from a multi-lance top blowing furnace, an oxygen bottom blowing furnace or a PS converter; and / or, In the step S2, the second flux is selected from one or both of quartz stone and quartz sand; and / or, in the step S2, the iron-silicon ratio in the first blowing slag is (1.0-1.4):1 in terms of mass ratio.

4. The method for treating copper-nickel concentrate rich in platinum group metals according to claim 1, characterized in that: In step S3, the second blowing time is 1 to 3 hours; and / or, In step S3, the third flux is selected from one or both of quartz stone and quartz sand; In the step S3, the copper-silicon ratio in the second blowing slag is (0.6-1.0):1 in terms of mass ratio.

5. The method for treating a copper-nickel concentrate rich in platinum group metals according to any one of claims 1 to 4, characterized in that: In the step S4, the anode refining furnace is a rotary anode refining furnace; In step S4, the first reducing agent is selected from one or two of natural gas, coal, etc.

6. The method for treating a copper-nickel concentrate rich in platinum group metals according to any one of claims 1 to 4, characterized in that: In the step S5, the second reducing agent is sprayed into the depleted electric furnace through a side-blowing spray gun.

7. The method for treating a copper-nickel concentrate rich in platinum group metals according to any one of claims 1 to 4, characterized in that: In step S5, the second reducing agent is selected from one or both of pulverized coal and natural gas; and / or, In the step S5, the sulfiding agent is selected from pyrite or copper-nickel concentrate.

8. The method for treating a copper-nickel concentrate rich in platinum group metals according to any one of claims 1 to 4, characterized in that: In the step S5, the first blown slag is fed into the depletion furnace in a high-temperature molten state for depletion, and the second blown slag is cooled, crushed, and then fed into the depletion furnace in a solid state for depletion.

9. The method for treating a copper-nickel concentrate rich in platinum group metals according to any one of claims 1 to 4, characterized in that: In the step S6, the third blowing furnace is selected from an oxygen bottom blowing furnace or a PS converter.

10. The method for treating a copper-nickel concentrate rich in platinum group metals according to any one of claims 1 to 4, characterized in that: In the step S6, the third blown slag is used as a return material and supplied to the depleted electric furnace in a high-temperature molten state; In the step S6, the oxygen content in the oxygen-enriched air is 25% to 35% by volume.

Images