Method for recovering valuable metals from waste resources

Abstract

An aspect of the present invention provides a method for recovering valuable metals from waste resources. The method may comprise the steps of: preparing a molten metal containing iron (Fe); adding waste resources containing valuable metals and an additive for capturing valuable metals to the molten metal to capture the valuable metals, thereby obtaining a nickel matte; and recovering the valuable metals from the nickel matte, wherein the additive may include a sulfate.

Description

Method for recovering valuable metals from waste resources

[0001] The present invention relates to a method for recovering valuable metals from waste resources.

[0002] Because waste resources such as waste lithium batteries and waste catalysts contain valuable metals such as cobalt, nickel, and manganese, methods for recycling waste resources are being studied from the perspectives of economic feasibility and environmental friendliness.

[0003] Processes for recovering valuable metals from waste resources include dry and wet processes. Among these, the wet process has a relatively narrow range of applicable waste resource components, limiting flexibility in the selection of applicable raw materials.

[0004] Meanwhile, to reduce the load of the subsequent refining process, processes for concentrating the target valuable metal or removing impurities are typically performed upstream. However, these processes are somewhat cumbersome, and for low-grade waste resources, the concentration process incurs excessive costs.

[0005] Accordingly, there is a need for a method to recover valuable metals from waste resources using a simplified process while utilizing waste resources economically.

[0006] One aspect of the present invention is to provide a method for recovering valuable metals from waste resources using a simplified process.

[0007] The objectives of the present invention are not limited to the above-described matters. Additional objectives of the present invention are described throughout the specification, and those skilled in the art will have no difficulty understanding the additional objectives of the present invention from the contents described in the specification.

[0008] One aspect of the present invention provides a method for recovering valuable metals from waste resources. The method comprises the steps of: preparing a molten metal containing iron (Fe); adding a waste resource containing valuable metal and a capture additive to the molten metal to capture the valuable metal to obtain a nickel matte; and recovering the valuable metal from the nickel matte, wherein the capture additive may include sulfate.

[0009] Additionally, in the method described above, the sulfate may include at least one selected from the group consisting of sodium sulfate (Na2SO4) and calcium sulfate (CaSO4).

[0010] In addition, in one of the above-described methods, in the step of obtaining the nickel matte, the sulfate may be added in an amount of 20 to 40 parts by weight based on 100 parts by weight of the molten metal.

[0011] Additionally, in one of the aforementioned methods, the step of obtaining the nickel mat may be performed at 1400 to 1700°C.

[0012] Additionally, in one of the aforementioned methods, the temperature of the molten metal in the step of preparing the molten metal may be 1400 to 1700°C.

[0013] Additionally, in one of the aforementioned methods, the valuable metal may include at least one selected from the group consisting of nickel, cobalt, and manganese.

[0014] Additionally, in one of the aforementioned methods, the waste resource may contain carbon in an amount of more than 0% by weight and less than or equal to 30% by weight based on the total weight of the waste resource.

[0015] Additionally, in one of the aforementioned methods, the waste resource may contain 10 to 40 wt% of nickel based on the total weight of the waste resource.

[0016] Additionally, in one of the aforementioned methods, the waste resource may be at least one selected from the group consisting of waste lithium batteries, waste cemented carbide, and waste catalysts.

[0017] Additionally, in one of the aforementioned methods, the method can recover 90% or more of the valuable metal from the waste resource.

[0018] According to the present invention, valuable metals can be recovered from waste resources more efficiently using a simplified process.

[0019] In addition, according to the present invention, the recovery rate of valuable metal can be improved by adding a capturing additive in the capturing process of valuable metal without a process such as concentration or de-ironization of valuable metal.

[0020] The various advantageous and beneficial advantages and effects of the present invention are not limited to the above-described contents, and will be more easily understood in the course of explaining specific embodiments of the present invention.

[0021] In order to more fully understand the drawings cited in the detailed description of the present invention, a brief description of each drawing is provided.

[0022] FIG. 1 is a flowchart of a method for recovering valuable metals from waste resources according to one embodiment of the present invention.

[0023] Figure 2 is a graph measuring the alloy composition of nickel matte according to the ratio of sulfate added to the molten metal.

[0024] Figure 3 is a graph measuring the composition of a nickel mat obtained according to an embodiment of the present invention.

[0025] Hereinafter, preferred embodiments of the present invention will be described. However, the embodiments of the present invention may be modified in various other forms, and the terminology used herein is for the purpose of describing the present invention and is not intended to limit the present invention. Furthermore, the singular forms used herein also include plural forms, unless the relevant definition clearly indicates a contrary meaning.

[0026] In this specification, the term "including" is used to indicate that other components may be included rather than excluding other components unless specifically stated to the contrary.

[0027] Unless otherwise defined, all terms, including technical and scientific terms, used herein have the same meaning as commonly understood by a person of ordinary skill in the art to which this invention pertains. Terms defined in the dictionary are to be interpreted to have meanings consistent with the relevant technical literature and the present disclosure.

[0028] Typically, after capturing valuable metals from waste resources, the valuable metals are recovered by using a concentrate such as a sulfur (S) raw material to concentrate the target valuable metals, or by separately performing a process to remove impurities (e.g., a de-ironization process).

[0029] Specifically, in the conventional process of concentrating valuable metals, sulfur (S) was added as a concentrating agent to the captured valuable metals, thereby concentrating the valuable metals and producing nickel matte. At this time, the concentrating process according to the addition of sulfur can be expressed by the following equation 1.

[0030] <Formula 1>

[0031] 3Ni + 2S = Ni3S2

[0032] Additionally, in the conventional de-ironization process, iron was removed by supplying oxygen to the captured valuable metal, thereby generating iron oxide and separating it into slag. The de-ironization process according to the oxygen input can be expressed by Equation 2 below.

[0033] <Formula 2>

[0034] 2Fe + O2= 2FeO

[0035] However, the conventional process as described above is somewhat complicated and cumbersome because it requires a separate supply of concentrate or oxygen, and in the case of low-grade waste resources, there is a problem that the cost of the concentration process is excessive.

[0036] The inventors of the present invention completed the present invention after confirming through experiments that the above-mentioned problems can be improved by adding a capture additive when adding waste resources to the molten metal.

[0037] Specifically, by appropriately controlling the type and amount of the capture additive, it is possible to efficiently recover valuable metals from waste resources through only the process of capturing valuable metals without performing separate processes such as concentration or de-ironization of valuable metals.

[0038] Hereinafter, a method for recovering valuable metals from waste resources according to one embodiment of the present invention will be described.

[0039] FIG. 1 is a flowchart of a method for recovering valuable metals from waste resources according to one embodiment of the present invention.

[0040] [Preparation of molten metal]

[0041] First, a molten metal can be prepared to capture valuable metals from waste resources (S110). The molten metal may contain iron (Fe). By including iron, the ability to capture valuable metals can be enhanced. However, this is not a limitation, and the composition of the molten metal can be varied without compromising the effectiveness of the present invention.

[0042] For example, the molten metal may contain iron at least 50 wt% based on the total weight of the molten metal. If the iron content is less than 50 wt%, the ability of iron to capture valuable metals may be reduced. That is, the iron content may be at least 50 wt%, more specifically at least 55 wt%, and even more specifically at least 60 wt%.

[0043] For example, the molten metal may include at least one selected from the group consisting of molten pig iron (molten iron) generated in the ironmaking process, molten metal obtained by melting scrap iron, molten metal obtained by melting iron contained in waste resources themselves during a dry process, and molten ferronickel, which is an intermediate or finished product of the ferronickel process. By utilizing the above materials as the molten metal, the cost of the valuable metal recovery process can be reduced and the economic feasibility can be improved.

[0044] For example, in this step (S110), the temperature of the molten metal may be 1400 to 1700°C. If the temperature of the molten metal is lower than 1400°C, solidification of the molten metal may occur, which may reduce the capture efficiency of the valuable metal. In addition, if the temperature of the molten metal exceeds 1700°C, the lifespan of the furnace body containing the molten metal may be shortened, or energy consumption may excessively increase. That is, the temperature of the molten metal may be 1400 to 1700°C, and more specifically, 1550 to 1700°C.

[0045] [Nickel matte production steps]

[0046] Next, waste materials and capture additives can be added to the molten metal to obtain nickel matte (S120). Specifically, since waste materials contain valuable metals, the valuable metals can be captured by adding waste materials to the molten metal, thereby obtaining nickel matte enriched with valuable metals.

[0047] For example, the waste resource may be one or more selected from the group consisting of, but not limited to, waste lithium batteries, waste cemented carbide, and waste catalysts. For example, the waste resource may be added to the molten metal either crushed or uncrushed. Because waste resources contain various types of valuable metals, these valuable metals can be recovered and recycled from these waste resources.

[0048] For example, the valuable metal may include one or more selected from the group consisting of nickel, cobalt, and manganese. For example, the waste resource may include 10 to 40 wt% nickel based on the total weight of the waste resource. Additionally / alternatively, the waste resource may include 5 to 30 wt% cobalt based on the total weight of the waste resource. Additionally / alternatively, the waste resource may include 5 to 30 wt% manganese based on the total weight of the waste resource. However, the present invention is not limited thereto, and waste resources having various compositions may be utilized within a range that does not impair the effects of the present invention.

[0049] For example, waste resources may contain carbon in addition to valuable metals. Carbon is an element inherently contained within waste resources. For example, waste resources may contain carbon in an amount greater than 0% by weight and less than 30% by weight, based on the total weight of the waste resources. More specifically, the carbon content may be greater than 0% by weight and less than 25% by weight, and even more specifically, greater than 0% by weight and less than 20% by weight. However, this is not a limitation.

[0050] In this step (S120), the valuable metal contained in the waste resource can be captured in at least one of the following forms: a molten substance dissolved in iron, a reduced substance reduced by iron, and a slag. For example, if the valuable metal contained in the waste resource is in a metallic form, the metal (e.g., a metal such as Ni or Co) can be captured in the form of a molten substance dissolved in iron.

[0051] For example, if the valuable metal contained in the waste resource is in the form of an oxide, the oxide of the metal (e.g., oxides of Ni, Co, etc.) that is more reducible than iron can be reduced to metal by the iron in the molten metal and captured in the capture molten metal. At this time, the iron in the molten metal becomes iron oxide and can be separated to the upper part of the molten metal. Specifically, the reduction reaction of the metal oxide can be represented by the following reaction formula 1.

[0052] [Reaction Formula 1]

[0053] MO + Fe = FeO + M

[0054] (In the above reaction formula 1, M represents a metal such as Ni or Co.)

[0055] For example, if the valuable metal contained in the waste resource is in the form of sulfide, the sulfide of the valuable metal (e.g., sulfide of Ni, Co, etc.) can be reduced to metal by the iron in the molten metal and captured in the capture molten metal. At this time, the iron in the molten metal can be separated into iron sulfide and separated to the upper part of the molten metal. Specifically, the reduction reaction of the metal to sulfide can be expressed by the following reaction formula 2.

[0056] [Reaction Formula 2]

[0057] MS + Fe = FeS + M

[0058] (In the above reaction formula 2, M represents a metal such as Ni or Co.)

[0059] For example, this step (S120) may be performed until the iron content in the molten metal is so low that the valuable metal cannot be reduced to the form of oxide or sulfide.

[0060] Traditionally, to recover valuable metals from waste resources, a separate process was performed: first, the valuable metals were collected from the waste resources, and then the target metals were concentrated or impurities (e.g., iron) were removed. However, this process was somewhat cumbersome, and for low-grade waste resources, the concentration process was excessively expensive.

[0061] A method for recovering valuable metals according to one embodiment of the present invention has the characteristic of improving the aforementioned problems by adding a capture additive at the same time as adding waste materials to the molten metal. Specifically, by appropriately controlling the type and amount of capture additive, valuable metals can be efficiently recovered from waste materials solely through the process of capturing the valuable metals, without the need for separate processes such as concentration or de-metalization of the valuable metals.

[0062] By incorporating capture additives into the molten metal along with waste resources, the recovery rate of valuable metals can be improved without the need for processes such as concentration or de-metalization. Capture additives may include sulfates. For example, capture additives may be introduced in solid form. However, this is not a limitation; capture additives may also be introduced in liquid form or as a mixture of liquid and solid.

[0063] For example, the sulfate may include, but is not limited to, one or more selected from the group consisting of sodium sulfate (Na2SO4) and calcium sulfate (CaSO4). For example, when sodium sulfate is used as the sulfate, iron can be separated into iron oxide through a reaction with sodium sulfate, and nickel can be separated into a nickel matte in which nickel is captured and concentrated through a reaction with sodium sulfate. Specifically, the reaction between iron, nickel, and sodium sulfate can be represented by the following reaction formula 3.

[0064] [Reaction Formula 3]

[0065] 6Fe + 3Ni + 2Na2SO4= 2Na2O + 6FeO +Ni3S2

[0066] For example, when calcium sulfate is used as a sulfate, iron can be separated into iron oxide through a reaction with calcium sulfate, and nickel can be separated into nickel matte in which nickel is captured and concentrated through a reaction with calcium sulfate. Specifically, the reaction between iron, nickel, and calcium sulfate can be represented by the following reaction formula 4.

[0067] [Reaction Formula 4]

[0068] 6Fe + 3Ni + 2CaSO4= 2CaO + 6FeO +Ni3S2

[0069] For example, in this step (S120), sulfate may be added in an amount of 20 to 40 parts by weight based on 100 parts by weight of the molten metal. If the amount of sulfate added is less than 20 parts by weight based on 100 parts by weight of the molten metal, the capture efficiency of valuable metals may be low, thereby reducing the recovery rate of valuable metals from waste resources. In addition, if the amount of sulfate added exceeds 40 parts by weight based on 100 parts by weight of the molten metal, the problem of increasing the content of impurities (e.g., sulfur, etc.) in the nickel matte may occur.

[0070] In this regard, Fig. 2 is a graph measuring the alloy composition of nickel matte according to the ratio of sulfate input to the molten metal. Specifically, Fig. 2 shows the alloy composition of the molten metal after sulfate input using a thermodynamic program (FactSage TM ) is a graph showing the results calculated.

[0071] Referring to Fig. 2, by controlling the ratio of the input of the capture additive (i.e., sulfate) to the molten metal, the content of valuable metal and the content of impurities contained in the nickel mat can be appropriately adjusted. That is, the sulfate can be input in an amount of 20 to 40 parts by weight based on 100 parts by weight of the molten metal, more specifically, 21 to 39 parts by weight, and even more specifically, 22 to 38 parts by weight.

[0072] For example, this step (S120) may be performed at 1400 to 1700°C. If the temperature at which the capture process for valuable metals is performed is lower than 1400°C, the reaction efficiency between the molten metal, waste resources, and capture additives may decrease, thereby lowering the capture efficiency of valuable metals. In addition, if the temperature at which the capture process for valuable metals is performed exceeds 1700°C, the lifespan of the furnace body in which the capture process is performed may be shortened, or the atmosphere of the furnace body may become unstable, thereby causing problems such as lowering the quality of valuable metals. That is, the temperature at which the capture process for valuable metals is performed may be 1400 to 1700°C, and more specifically, 1550 to 1700°C.

[0073] A method for recovering valuable metals from waste resources according to one embodiment of the present invention utilizes a dry process. Specifically, by melting batteries at high temperatures and then separating and recovering valuable metals from the slag, the dry process eliminates the need for large quantities of chemicals such as sulfuric acid, offering the advantage of being environmentally friendly.

[0074] [Recovery stages of valuable metals]

[0075] Thereafter, valuable metals can be recovered from the nickel matte (S130). For example, one or more of acid leaching, ammonia leaching, and high-pressure oxidation leaching may be used as a method for recovering valuable metals. However, this is not a limitation, and various methods may be used for recovering valuable metals as long as they do not impair the effectiveness of the present invention.

[0076] For example, more than 90% of valuable metals can be recovered from waste resources. The recovery rate can be calculated by dividing the content of valuable metals in the nickel matte by the content of valuable metals in the waste resources. In this way, the recovery rate of valuable metals can be maximized through a single capture process, without the need for separate enrichment or de-metallization processes.

[0077] Hereinafter, the present invention will be described in more detail through examples. However, it should be noted that the following examples are intended only to illustrate and further illustrate the present invention and are not intended to limit the scope of the invention. This is because the scope of the invention is determined by the matters set forth in the patent claims and matters reasonably inferred therefrom.

[0078] (Example)

[0079] First, pig iron was melted in an induction furnace to prepare 2.5 kg of molten iron, which was then maintained at 1600°C. Subsequently, while stirring the molten iron, 2.5 kg of spent battery black powder as a waste resource and 0.5 kg of sodium sulfate (Na2SO4) as a capture additive were added to the molten iron, and valuable metals were captured at 1600°C. Thus, nickel matte with valuable metals captured thereon was obtained, and the valuable metals were recovered from the nickel matte.

[0080] At this time, the composition of the waste resource is shown in Table 1 below (unit: weight%), the composition of the nickel matte obtained after the waste resource and sodium sulfate were added is shown in Table 2 below (unit: weight%), and the composition of the slag generated in the nickel matte obtaining process is shown in Table 3 below (unit: weight%).

[0081] LiNiCoMnFeAlCuCaSiPCS6.77034.93011.1809.5200.0200.062<0.0010.0130.0120.0112.4900.091

[0082] FeNiCoMnNaCS255114.20.0470.0080.00310.35

[0083] MgONiOCoOMnOLi2OFeOFe2O3Na2OSiO2CaOAl2O3P2O55.162.291.3136.647.2523.0032.300.430.040.193.170.02

[0084] (Comparative example)

[0085] First, pig iron was melted in an induction furnace to prepare 2.5 kg of Fe as molten metal, and the temperature of the molten metal was maintained at 1600°C. Then, while stirring the molten metal, 2.5 kg of waste battery black powder and 250 g of SiO2 were added as waste resources to the molten metal to capture valuable metals (weight of captured alloy: 1.8 kg).

[0086] At this time, the composition of the waste resource is the same as in the example, and the composition of the molten metal in which valuable metals are captured after the waste resource is input is shown in Table 4 below (unit: weight%), and the composition of the slag generated in the valuable metal capture process is shown in Table 5 below (unit: weight%).

[0087] FeNiCoMnCS49.7038.111.10.050.00620.012

[0088] MgONiOCoOMnOLi2OFeOSiO2CaOAl2O3P2O5CS6.140.690.4728.268.8062.526.200.000.870.070.060.08

[0089] Afterwards, the captured valuable metal was melted in an induction furnace, and 200 g of S was added as a concentrate to produce a molten alloy, which was then maintained at 1300 to 1400°C. Thereafter, while stirring the molten metal, 400 g of SiO2 was added and oxygen was blown at 5 L / min, to concentrate the valuable metal until the concentration of Fe reached approximately 5% (weight of concentrated alloy: 1.11 kg).

[0090] At this time, the composition of the concentrated valuable metal is shown in Table 6 below (unit: weight%), and the composition of the slag generated in the process of concentrating the valuable metal is shown in Table 7 below (unit: weight%).

[0091] FeNiCoMnCS4.0567.75.110.0030.00917.71

[0092] MgONiOCoOMnOLi2OFeOSiO2CaOAl2O3P2O5CS6.054.625.3560.060.0354.8020.640.001.700.050.020.04

[0093] (Experimental example: Measuring the recovery rate of valuable metals)

[0094] Ni and Co in waste resources were recovered using the methods of the above examples and comparative examples, and the recovery rates of valuable metals in the examples and comparative examples were measured.

[0095] In the case of the recovery rate of Ni, the recovery rate of Co, and the recovery rate of (Ni+Co) in the examples, the results were calculated using the following mathematical formulas 1, 2, and 3, and the results are shown in Table 8 below.

[0096] <Mathematical Formula 1>

[0097] Recovery rate of Ni (%) = (Weight of Ni contained in nickel matte) / [(Weight of Ni contained in nickel matte) + (Weight of Ni contained in slag)] Х 100

[0098] <Mathematical Formula 2>

[0099] Recovery rate of Co (%) = (Weight of Co contained in nickel matte) / [(Weight of Co contained in nickel matte) + (Weight of Co contained in slag)] Х 100

[0100] <Mathematical Formula 3>

[0101] Recovery rate of (Ni+Co) (%) = (sum of the weight of Ni and the weight of Co contained in the nickel mat) / [(sum of the weight of Ni and the weight of Co contained in the nickel mat) + (sum of the weight of Ni and the weight of Co contained in the slag)] Х 100

[0102] Example of classification Recovery rate of Ni (%) 93.77 Recovery rate of Co (%) 81.87 Recovery rate of (Ni+Co) (%) 90.89

[0103] In the comparative example, the recovery rate of Ni, the recovery rate of Co, and the recovery rate of (Ni+Co) were calculated using the following mathematical equations 4, 5, and 6. Specifically, the de-ironization rate, the recovery rate of Ni, the recovery rate of Co, and the recovery rate of (Ni+Co) were measured over time from the time point when the concentration process of the captured valuable metals began, and the results are shown in Table 9 below.

[0104] <Mathematical Formula 4>

[0105] Recovery rate of Ni (%) = (Weight of Ni contained in nickel matte N minutes after the start of concentration) / [(Weight of Ni contained in nickel matte N minutes after the start of concentration) + (Weight of Ni contained in slag N minutes after the start of concentration)] Х 100

[0106] <Mathematical Formula 5>

[0107] Recovery rate of Co (%) = (Weight of Co contained in nickel matte N minutes after the start of thickening) / [(Weight of Co contained in nickel matte N minutes after the start of thickening) + (Weight of Co contained in slag N minutes after the start of thickening)] Х 100

[0108] <Mathematical Formula 6>

[0109] Recovery rate (%) of (Ni+Co) = (sum of the weight of Ni and the weight of Co contained in the nickel matte N minutes after the start of the concentration) / [(sum of the weight of Ni and the weight of Co contained in the nickel matte N minutes after the start of the concentration) + (sum of the weight of Ni and the weight of Co contained in the slag N minutes after the start of the concentration)] Х 100

[0110] Classification Comparison Pre-deposition rate (%) Recovery rate of Ni (%) Recovery rate of Co (%) Recovery rate of (Ni+Co) (%) Initial (0 min) 0.00 100.00 100.00 100.00 30 min After 46.0 39 8.1 58 8.4 69 5.7 7 6 0 min After 77.6 59 7.3 78 7.6 69 5.3 0 9 0 min After 93.7 18 9.0 7 4 6 5 3 8 0.9 2 Final 94.8 28 9.0 7 3 4.6 7 8 0.2 3

[0111] Referring to Table 8, in the case of the example, it was confirmed that the recovery rate of Ni was measured as 93.77%, and the recovery rate of Co was measured as 81.87%. In other words, it was found that valuable metals can be recovered from waste resources at a high recovery rate through the capture process alone, even without performing a separate enrichment or de-ironization process for valuable metals.

[0112] In this regard, Fig. 3 is a graph measuring the composition of a nickel mat obtained according to an embodiment of the present invention. Specifically, Fig. 3 is a graph measuring the composition of a nickel mat using an X-ray diffraction (XRD) analysis method. Each peak in Fig. 3 represents a peak of FeNi3.

[0113] Referring to FIG. 3, it can be seen that the nickel mat manufactured in the example includes FeNi3. That is, it can be confirmed that a nickel mat containing valuable metals was appropriately manufactured according to the example of the present invention, and that the recovery rate of valuable metals including nickel was improved.

[0114] Meanwhile, referring to Table 9, in the comparative example, it was confirmed that the final recovery rate of Ni was measured as 89.07% and the recovery rate of Co was measured as 34.67%. In other words, it was found that the recovery rates of Ni and Co were measured lower than in the example even though the concentration or de-ironization process of the valuable metal was performed separately.

[0115] In this way, in the case of the embodiment, when the waste resource is added to the molten metal, by adding a capture additive together, the valuable metal can be efficiently recovered from the waste resource only through the process of capturing the valuable metal without performing a separate process such as concentration or de-ironization of the valuable metal.

[0116] The above embodiments are merely examples and the present invention is not limited thereto. Anything that has substantially the same configuration and achieves the same operational effects as the technical concepts described in the claims of the present invention is included within the technical scope of the present invention.

Claims

1. Step of preparing molten metal containing iron (Fe); A step of obtaining nickel matte by adding waste resources containing valuable metal and a capturing additive to the molten metal to capture the valuable metal; and Comprising a step of recovering the valuable metal from the nickel matte, A method for recovering valuable metals from waste resources, wherein the above-mentioned capturing additive comprises sulfate.

2. In paragraph 1, The above sulfate is sodium sulfate (Na 2 SO 4 ) and calcium sulfate (CaSO 4 A method for recovering valuable metals from waste resources, comprising at least one selected from the group consisting of:

3. In paragraph 1, A method for recovering valuable metals from waste resources, wherein in the step of obtaining the nickel matte, the sulfate is added in an amount of 20 to 40 parts by weight based on 100 parts by weight of the molten metal.

4. In paragraph 1, A method for recovering valuable metals from waste resources, wherein the step of obtaining the above nickel matte is performed at 1400 to 1700°C.

5. In paragraph 1, A method for recovering valuable metals from waste resources, wherein the temperature of the molten metal in the step of preparing the molten metal is 1400 to 1700°C.

6. In paragraph 1, A method for recovering valuable metals from waste resources, wherein the valuable metals include at least one selected from the group consisting of nickel, cobalt and manganese.

7. In paragraph 1, A method for recovering valuable metals from waste resources, wherein the waste resources contain carbon in an amount of more than 0% by weight and less than or equal to 30% by weight based on the total weight of the waste resources.

8. In paragraph 1, A method for recovering valuable metals from waste resources, wherein the waste resources contain 10 to 40 wt% of nickel based on the total weight of the waste resources.

9. In paragraph 1, A method for recovering valuable metals from waste resources, wherein the waste resources are at least one selected from the group consisting of waste lithium batteries, waste superalloys, and waste catalysts.

10. In paragraph 1, A method for recovering valuable metals from waste resources, wherein the method recovers 90% or more of the valuable metals from the waste resources.

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