Method for separating and enriching gold, iron and nickel in electronic waste and continuously measuring gold and nickel

Abstract

The invention provides a method for separation-enrichment of gold, iron and nickel in electronic waste and continuous determination of gold and nickel, and belongs to the technical field of metal detection in the electronic waste, the electronic waste containing iron, nickel and gold is mixed with an agent, water is added for dissolution, solid-liquid separation is performed, and a gold-containing solid and filtrate are obtained; a diluent of a nickel chelating collector is added into the filtrate for extraction, an inorganic phase solution is separated, a reverse collector is added into the organic phase solution for back extraction, and the content of nickel is detected; adjusting the pH value of the inorganic phase solution to a preset range to realize precipitation and purification of iron; and drying the gold-containing solid, and detecting the content of gold by adopting a fire assaying method. According to the method, through front-end separation of iron and nickel, efficient collection of nickel, precipitation and purification of iron and accurate enrichment of gold, separation-enrichment of gold, iron and nickel is achieved, meanwhile, recycling of resources is taken into account, subsequent accurate testing of the gold content is guaranteed, and the accuracy of testing of the gold element content in the electronic waste is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of detecting gold, iron, and nickel in electronic waste, and particularly relates to a method for separating and enriching gold, iron, and nickel in electronic waste and continuously determining gold and nickel. Background Art

[0002] As "urban minerals", electronic waste contains rich precious metal resources, especially gold, whose content can reach dozens of times that of natural mineral deposits, providing great potential for resource recycling. Taking waste mobile phones as an example, about 350 grams of gold can be extracted per ton, far exceeding the average grade of gold mines (usually less than 5 grams / ton). The recycling of electronic waste not only creates significant economic benefits, but also reduces energy consumption for metal recovery by more than 70% compared with ore smelting.

[0003] The occurrence form of gold in electronic waste is significantly different from that of natural minerals, and its complexity poses challenges to traditional detection technologies. Taking printed circuit boards (PCBs) as an example, their layered composite structure makes precious metals often occur in the form of micron-sized elemental particles or multi-element alloy aggregates embedded in iron-nickel alloy substrates. The chemical bonding mode of such artificial synthetic materials is essentially different from the crystal structure of natural minerals, resulting in traditional content detection methods, such as mineral image analysis technology, being difficult to accurately analyze the content of each metal in electronic waste, and other detection methods need to be used in combination.

[0004] At present, although the fire assay method is a widely used method for detecting the content of gold elements, this technology is mainly applied to the field of natural minerals, and there are certain limitations in detecting the gold content in non-natural mineral resources such as electronic waste. For example, the iron and nickel content in electronic waste is too high, which is 5 to 8 orders of magnitude of the mass of gold elements. The high content of iron easily reacts with the sulfur source in the sample to form iron sulfide. During the detection test, the iron sulfide adheres to the surface of the lead beads, resulting in difficulty in agglomerating the lead beads and the phenomenon of lead hanging, and the gold cannot be completely trapped, resulting in the inability to accurately determine the gold content in the sample finally. And the high content of nickel can enrich gold. During the cupellation process, the gold will enter the ash pan with the oxidation of nickel, resulting in a low result of gold.

[0005] In view of this, it is necessary to design an improved method for separating and enriching gold, iron, and nickel in electronic waste and continuously determining gold and nickel to solve the above problems. Summary of the Invention

[0006] In view of the technical problems existing in the background art, the present application provides a method for separating and enriching gold, iron, and nickel in electronic waste and continuously determining gold and nickel, aiming to solve the technical problem that traditional content detection methods are difficult to accurately analyze the content of each metal in electronic waste.

[0007] The present application provides a method for separating, enriching gold, iron, and nickel in electronic waste and continuously determining gold and nickel, comprising the following steps: S1. Mix electronic waste containing iron, nickel, and gold with a reagent, add water for dissolution, and perform solid-liquid separation to obtain a gold-containing solid and a filtrate; S2. Add a dilution of a nickel chelating collector to the filtrate obtained in step S1 for extraction, separate the inorganic phase solution, add a reverse collector to the organic phase solution for back-extraction, and detect the nickel content; the structural formula of the nickel chelating collector is: ; S3. Adjust the pH value of the inorganic phase solution obtained in step S2 to a predetermined range to achieve precipitation and purification of iron; S4. Dry the gold-containing solid obtained in step S1 and detect the gold content by the fire assay method.

[0008] As a further improvement of the present application, in step S1, the reagent consists of sodium persulfate and sodium glycinate.

[0009] As a further improvement of the present application, the mass ratio of sodium persulfate to sodium glycinate is 1:(1 - 1.5).

[0010] As a further improvement of the present application, the mass ratio of the reagent to the electronic waste is (1 - 50):1.

[0011] As a further improvement of the present application, in step S2, the dilution of the nickel chelating collector is prepared by mixing the nickel chelating collector and sulfonated kerosene at a volume ratio of 1:(5 - 10).

[0012] As a further improvement of the present application, the volume ratio of the dilution of the nickel chelating collector to the filtrate is 1:(1 - 9).

[0013] As a further improvement of the present application, in step S2, the reverse collector is a glutamic acid solution with a concentration of 30 - 50 g / L.

[0014] As a further improvement of the present application, the volume ratio of the reverse collector to the dilution of the nickel chelating collector is (10 - 50):1.

[0015] As a further improvement of the present application, in step S1, the pH value of the filtrate is 8 - 9.

[0016] As a further improvement of the present application, in step S3, the pH value of the inorganic phase solution is 12 - 14.

[0017] The beneficial effects of the present application are: The present application provides a method for separating, enriching gold, iron, and nickel in electronic waste, and continuously determining gold and nickel. By mixing electronic waste containing iron, nickel, and gold with a reagent, adding water for dissolution, and performing solid-liquid separation, a gold-containing solid and a filtrate are obtained; adding a dilution of a nickel chelating collector to the filtrate for extraction, separating the inorganic phase solution, adding a reverse collector to the organic phase solution for back-extraction, and detecting the nickel content; adjusting the pH value of the inorganic phase solution to a predetermined range to achieve precipitation and purification of iron; drying the gold-containing solid and detecting the gold content by the fire assay method. Through the four-stage processes of front-end separation of iron and nickel, efficient collection of nickel, precipitation and purification of iron, and precise enrichment of gold, the present application realizes the separation and enrichment of gold, iron, and nickel while taking into account the recycling of resources, and at the same time ensures the accurate testing of the subsequent gold content, ultimately achieving the accuracy of the gold element content test in electronic waste.

[0018] In the step of efficient collection of nickel in the present application, a nickel chelating collector is designed and synthesized to achieve selective extraction and separation of nickel and iron in the solution system. The chelating collector has phenylalanine as the molecular backbone, formed by connecting 2 sulfur atoms (S) and 1 imino group (-NH) through carbon atoms, and the structural formula is S=C(-SH)-NH-R, where R is an aromatic ring group derived from phenylalanine; the unique aromatic ring structure of the molecule ensures the hydrophobicity of the extractant. In addition, the electronegativity of the sulfur atom in the molecular structure is relatively low (S: 2.58), and the polarity of the thiocarbonyl group (C=S) is weaker than that of the carbonyl group (C=O), resulting in weaker hydrogen bond interactions of this substance, which can avoid excessive self-association between molecules to the greatest extent. The weak intermolecular force makes it easier to release the lone pairs of electrons of sulfur atoms and amino groups or carboxyl groups, and preferentially coordinate with metal ions rather than combine with other molecules. This property is particularly crucial in the directional chelation reaction of metal ions, and can improve the kinetics and recovery rate in the metal extraction process. The synergistic effect of the carboxyl group and the "semicarbazide" structural fragment can reduce non-specific binding with other impurity ions and avoid interference from impurities, thereby improving the selectivity of chelation.

[0019] The above description is only an overview of the technical solution of the present application. In order to be able to more clearly understand the technical means of the present application, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features, and advantages of the present application more obvious and understandable, the following specifically illustrates the specific embodiments of the present application. Brief Description of the Drawings

[0020] In order to more clearly illustrate the technical solution of the present application, the drawings used in the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0021] Figure 1The mechanism diagram of the nickel chelating collector provided for this application; Figure 2 The synthesis route diagram of the nickel chelating collector provided for Example 7 of this application; Figure 3 The nuclear magnetic resonance hydrogen spectrum diagram of the nickel chelating collector provided for Example 7 of this application. Detailed implementation manners

[0022] The embodiments of the technical solution of this application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to illustrate the technical solution of this application more clearly, so they are only examples and cannot be used to limit the protection scope of this application.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above accompanying drawings are intended to cover non-exclusive inclusion.

[0024] Referring to "embodiments" herein means that the specific features, structures or characteristics described in connection with the embodiments can be included in at least one embodiment of this application. The phrase appears in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0025] The occurrence forms of gold in electronic waste are complex, and traditional detection technologies are difficult to accurately analyze its content. When the fire assay method is used to detect the gold content in electronic waste, due to the too high iron and nickel content, there are problems such as lead hanging and nickel enriching gold, resulting in inaccurate detection results.

[0026] To solve the technical problem of difficult accurate determination of gold in electronic waste, this application provides a method for separating, enriching gold, iron and nickel in electronic waste and continuously determining gold and nickel. Among them, through four processes of front-end separation of iron and nickel, efficient collection of nickel, precipitation purification of iron, and precise enrichment of gold, while realizing the separation and enrichment of gold, iron and nickel, taking into account the recycling of resources, and at the same time ensuring the precise test of the subsequent gold content, finally realizing the accuracy of the gold element content test in electronic waste.

[0027] The embodiments of this application provide a method for separating, enriching gold, iron and nickel in electronic waste and continuously determining gold and nickel, including the following steps: S1. Mix the electronic waste containing iron, nickel, and gold with a reagent, add water for dissolution, and perform solid-liquid separation to obtain a gold-containing solid and a filtrate; S2. Add a dilution of a nickel chelating collector to the filtrate obtained in step S1 for extraction, separate the inorganic phase solution, add a reverse collector to the organic phase solution for back-extraction, and detect the nickel content; the structural formula of the nickel chelating collector is: ; S3. Adjust the pH value of the inorganic phase solution obtained in step S2 to a predetermined range to achieve precipitation purification of iron; S4. Dry the gold-containing solid obtained in step S1 and use the fire assay method to detect the gold content.

[0028] In the technical solution of the embodiment of the present application, by adding a reagent and water to dissolve iron and nickel in the electronic waste, gold is initially separated from iron and nickel; the reagent adjusts the pH value of the mixed solution to alkaline. Under alkaline conditions, nickel ions form a stable complex with a specific nickel chelating collector to achieve nickel extraction. Subsequently, by adding a reverse collector, the complexation between nickel and the chelating collector is disrupted, causing nickel to re-enter the aqueous phase for convenient detection of nickel content. The structural formula of the chelating collector is S=C(-SH)-NH-R, where R is an aromatic ring group derived from phenylalanine; the pH value of the inorganic phase solution is adjusted to a range where iron ions can form iron hydroxide precipitation, enabling iron to be separated from the solution in the form of precipitation for resource recovery; the initially separated gold-containing solid is dried to remove moisture, and then the fire assay method is used to determine the gold content. Since the aforementioned steps have effectively removed the interference of iron and nickel, the accuracy of the fire assay method is significantly improved. Specifically, the gold detection method refers to the standard fire assay method of "GB / T 7739".

[0029] The present application separates and enriches iron and nickel, avoiding the lead hanging phenomenon caused by high iron content and the problem of low gold content caused by high nickel content enriching gold, improving the accuracy of gold content determination. By accurately determining the content of precious metals in electronic waste, it helps to improve the resource recovery efficiency, achieve the high-value utilization of electronic waste, and reduce energy consumption and environmental pollution.

[0030] Further, in some embodiments, in step S1, the reagent is composed of sodium persulfate and sodium glycinate.

[0031] In the technical solution of the embodiment of the present application, sodium persulfate provides strong oxidizing power to destroy the surface passivation layer of metals in electronic waste and promote metal dissolution; sodium glycinate stabilizes metal ions such as iron and nickel dissolved through complexation in the solution to prevent precipitation and assists the dissolution process through reduction. The two act synergistically to efficiently and selectively leach impurity metals such as iron and nickel in electronic waste into the filtrate, while gold remains in the solid residue due to its chemical stability, thus achieving preliminary solid-liquid separation and gold enrichment. At the same time, sodium glycinate has strong alkalinity, which helps to adjust the pH value of the mixed solution.

[0032] Further, in some embodiments, the mass ratio of sodium persulfate to sodium glycinate is 1:(1 - 1.5), and the mass ratio of the reagent to electronic waste is (1 - 50):1.

[0033] In the technical solution of the embodiment of the present application, by controlling the ratio and dosage of sodium persulfate and sodium glycinate, the leaching effect of target metals such as iron and nickel can be optimized. Specifically, in the mixed solution of electronic waste, reagent and water, the concentration of electronic waste is 1 - 10 g / L.

[0034] Further, in some embodiments, in step S2, the dilution of the nickel chelating collector is prepared by mixing the nickel chelating collector and sulfonated kerosene at a volume ratio of 1:(5 - 10).

[0035] In the technical solution of the embodiment of the present application, as Figure 1 shown, the nickel chelating collector is an organic reagent with a specific structure that can form a stable chelate with nickel ions. This chelate has a high solubility in sulfonated kerosene and a low solubility in the aqueous phase. Through this selective chelation and dissolution characteristic, the nickel chelating collector can effectively extract nickel ions from the aqueous phase. The appropriate ratio of the nickel chelating collector to sulfonated kerosene helps to minimize the viscosity and density of the organic phase while ensuring the extraction effect, facilitating subsequent separation operations.

[0036] Further, in some embodiments, the volume ratio of the dilution of the nickel chelating collector to the filtrate is 1:(1 - 9).

[0037] In the technical solution of the embodiment of the present application, the appropriate volume ratio helps to control the mass transfer rate between the organic phase and the aqueous phase, ensuring that nickel ions can quickly and efficiently enter the organic phase during the extraction process, facilitating the full contact of nickel ions with the organic phase, and thus improving the extraction efficiency of nickel.

[0038] Further, in some embodiments, in step S2, the reverse collector is a glutamic acid solution with a concentration of 30 - 50 g / L.

[0039] In the technical solution of the embodiment of the present application, the organic phase containing nickel chelate is contacted with the reverse collector glutamic acid solution. Glutamic acid can compete with the nickel chelate collector to bind nickel ions, forming a water-soluble nickel glutamate complex, so that the nickel ions re-enter the aqueous phase, facilitating the detection of the nickel concentration.

[0040] Further, in some embodiments, the volume ratio of the reverse collector to the dilution of the nickel chelate collector is (10~50):1.

[0041] In the technical solution of the embodiment of the present application, a higher volume of glutamic acid solution can provide sufficient glutamic acid molecules to ensure that nickel ions can be effectively back-extracted from the organic phase. If the volume of the glutamic acid solution is too small, it may not provide enough glutamic acid molecules to react with all nickel chelates, resulting in incomplete back-extraction and affecting the nickel recovery rate and the accuracy of the detection results.

[0042] Further, in some embodiments, in step S1, the pH value of the filtrate is 8~9.

[0043] In the technical solution of the embodiment of the present application, alkaline conditions are conducive to the nickel chelate collector to play a role and improve the chelation efficiency of nickel ions. In addition, under the condition of pH value of 8~9, iron ions chelate with glycine anions and present a solution state, avoiding the interference of iron precipitation.

[0044] Further, in some embodiments, in step S3, the pH value of the inorganic phase solution is 12~14.

[0045] In the technical solution of the embodiment of the present application, iron ions are more likely to form hydroxide precipitates under specific pH conditions, which helps to purify iron.

[0046] The following are some specific embodiments. It should be noted that the embodiments described below are exemplary and are only used to explain the present application and should not be construed as a limitation to the present application. For those embodiments where specific technologies or conditions are not indicated, the technologies or conditions described in the literature in this field or according to the product specifications are followed. For reagents or instruments whose manufacturers are not indicated, they are all conventional products that can be obtained through commercial purchase.

[0047] Example 1 This embodiment provides a method for treating a nickel-containing solution with a nickel chelate collector, including the following steps: Add 10 ml of the dilution of the nickel chelate collector to 1 L of a standard [Ni(NH3)6] alkaline solution with a concentration of 10 mg / L and a pH value of 9, where the structural formula of the nickel chelate collector is: 2+ ​; The dilution of the nickel chelating collector is prepared by mixing the nickel chelating collector and sulfonated kerosene at a volume ratio of 1:9, stirring for 30 min, collecting the organic phase solution, adding 50 ml of a glutamic acid solution with a concentration of 40 g / L to the collected organic phase solution, stirring for 30 min, collecting the inorganic aqueous phase solution, and detecting the nickel concentration using ICP-OES (Inductively Coupled Plasma Optical Emission Spectrometer). Among them, the detection error of ICP-OES is ±2%. The collecting ability of the nickel chelating collector is judged according to the following formula: Nickel content (%) = C1×V1 / (C0×V0) × 100% (1) Wherein, C1 is the nickel element concentration in the glutamic acid solution detected by ICP-OES; V1 is the volume of the glutamic acid solution; C0 is the concentration of the standard [Ni(NH3)6] 2+ alkaline solution used in the experiment; V0 is the volume of the standard [Ni(NH3)6] 2+ alkaline solution used in the experiment.

[0048] Example 2 and Comparative Examples 1-7 Example 2 and Comparative Examples 1-7 respectively provide a method for treating nickel-containing solutions with a nickel chelating collector. Compared with Example 1, the only difference is that the pH value of the standard [Ni(NH3)6] 2+ alkaline solution is different. The test results are shown in Table 1.

[0049] Table 1 Collecting ability — represents below the detection limit of ICP-OES.

[0050] As can be seen from Table 1, the collecting ability of the nickel chelating collector provided in Example 1 for nickel under alkaline conditions is significantly affected by pH, and the extraction effect reaches over 97% within a specific pH range (8-9). Under acidic or neutral conditions (pH ≤ 7), the nickel chelating collector decomposes, affecting the collecting effect of nickel in the solution. Alkaline conditions (8-9) ensure the stability of the nickel chelating collector. When the pH value is greater than 9, the sulfhydryl group (-S-) dissociated from the nickel chelating collector forms a disulfide bond (-S-S-), affecting the chelating effect of the collector. The suitable pH range provides a prerequisite guarantee for the leaching-extraction-recovery of nickel in electronic waste.

[0051] Example 3 This example provides a method for the separation-enrichment of gold, iron, and nickel in electronic waste and the continuous determination of gold and nickel, including the following steps: S1. Mix 5 g of electronic waste containing iron, nickel, and gold (waste USB interface material, with the standard gold content value of 3,410 g / t and the value determined by the manufacturer's process consumables report) with 20 g of sodium persulfate and 20 g of sodium glycinate, add 1 L of deionized water, and dissolve for 8 h at room temperature. The iron and nickel in the electronic waste exist in the form of single substances or alloys, are oxidized under the action of sodium persulfate, and then chelate with glycine anions in an alkaline environment. The chelate dissolves in the liquid phase, realizing the transfer from the solid form to the liquid phase. After solid-liquid separation, a gold-containing solid and a filtrate are obtained; judge the nickel content in the electronic waste according to the following formula: The nickel content (%) in the electronic waste = C×V / m×100% (2) where C is the nickel concentration in the filtrate; V is the volume of the filtrate; m is the mass of the electronic waste used in the experiment; S2. Add 1 L of the dilution of the nickel chelating collector to the filtrate, stir for 30 min for extraction. The nickel chelating collector dilution is prepared by mixing the nickel chelating collector and sulfonated kerosene at a volume ratio of 1:9. Separate the inorganic phase solution and detect the nickel concentration in the inorganic aqueous phase after extraction; add 10 L of 40 g / L glutamic acid solution to the organic phase solution, stir for 30 min for back-extraction, collect the inorganic aqueous phase solution, and detect the nickel concentration in the inorganic aqueous phase after back-extraction; the structural formula of the nickel chelating collector is: ; S3. Add sodium hydroxide to adjust the pH value of the inorganic phase solution obtained in step S2 to 12 to generate iron hydroxide precipitation, achieving the purpose of purifying iron in the solution system; S4. Dry the gold-containing solid obtained in step S1 and detect the gold content by the fire assay method.

[0052] Example 4 This example provides a method for the separation, enrichment of gold, iron, and nickel in electronic waste and the continuous determination of gold and nickel. Compared with Example 3, the only difference is that the electronic waste is 5 g of the material at the connection of the waste printed circuit board chip containing iron, nickel, and gold elements, and the standard gold content value is 1,500 g / t (the value determined by the manufacturer's process consumables report).

[0053] Example 5 This example provides a method for the separation, enrichment of gold, iron, and nickel in electronic waste and the continuous determination of gold and nickel. Compared with Example 3, the only difference is that the mass ratio of sodium persulfate to sodium glycinate is 1:1.5.

[0054] Example 6 This embodiment provides a method for separating, enriching gold, iron, and nickel in electronic waste, and continuously determining gold and nickel. Compared with Embodiment 3, the only difference is that the pH value of the inorganic phase solution is adjusted to 14.

[0055] Comparative Example 8 Comparative Example 8 provides a method for separating, enriching gold, iron, and nickel in electronic waste, and continuously determining gold and nickel. Compared with Embodiment 3, the only difference is that 1.00 mg of gold is additionally added in step S1.

[0056] Comparative Example 9 Comparative Example 9 provides a method for separating, enriching gold, iron, and nickel in electronic waste, and continuously determining gold and nickel. Compared with Embodiment 4, the only difference is that 1.00 mg of gold is additionally added in step S1.

[0057] Comparative Example 10 Comparative Example 10 provides a method for separating, enriching gold, iron, and nickel in electronic waste, and continuously determining gold and nickel. Compared with Embodiment 3, the only difference is that the electronic waste is directly detected by the fire assay method, and the test analysis method refers to "GB / T 7739".

[0058] Comparative Example 11 Comparative Example 11 provides a method for separating, enriching gold, iron, and nickel in electronic waste, and continuously determining gold and nickel. Compared with Embodiment 4, the only difference is that the electronic waste is directly detected by the fire assay method, and the test analysis method refers to "GB / T 7739".

[0059] The test results are shown in Tables 2 and 3.

[0060] As can be seen from Table 2, in Embodiments 3 to 5, nickel leaching was achieved in step S1, and efficient nickel collection (extraction rate > 99%) was achieved in step S2. At the same time, through the back-extraction process, nickel recovery can be realized, and the back-extraction rate > 90%. While ensuring the accurate measurement of gold in the follow-up, the recycling of nickel resources is also realized.

[0061] Table 3 Error between standard value and experimental value of gold Among them, 。

[0062] As can be seen from Table 3, the traditional method has a large test error. The method provided by this application has high accuracy in different types of standard electronic waste samples with different content ratios, and the error range is less than 7%, meeting the requirements of existing tests and their standards.

[0063] Embodiment 7 This embodiment provides a preparation method of a nickel chelating collector, and the synthesis route diagram is as follows Figure 2 shown, and specifically includes the following steps: Dissolve 1 mol of phenylalanine and 1.5 mol of sodium hydroxide in 50 ml of water, stir and dissolve for 30 min, restore to room temperature, add 1.2 mol of carbon disulfide, heat to 50 °C, and reflux for 2 h; after the reaction is completed, rotary evaporate at 70 °C to remove excess carbon disulfide and water to prepare an orange-yellow oily nickel chelating collector with a yield of 81%. The nuclear magnetic resonance hydrogen spectrum is as follows Figure 3 shown, (a) is the full nuclear magnetic resonance hydrogen spectrum, and (b) is the partial enlarged view of the nuclear magnetic resonance hydrogen spectrum in the range of chemical shift 4.70 - 5.00. The specific nuclear magnetic test results are as follows: 300 MHz, deuterated reagent is D2O, δ 13.00 - 14.00 (1H, from NH), δ 9.00 - 10.00 (5H, from benzene ring), δ 4.80 - 4.82 (2H, from methylene). The synthesis of the target product is proved by nuclear magnetic resonance characterization, and the molecular structure of the nickel chelating collector is sodium phenylalanine dithiocarbamate.

[0064] It should be noted that this application is not limited to the above embodiments. The above embodiments are only examples, and embodiments with the same structure and the same effect as the technical idea within the technical solution scope of this application are all included in the technical scope of this application. In addition, within the scope of not departing from the main idea of this application, various modifications that can be thought of by those skilled in the art to the embodiments, and other ways constructed by combining some components in the embodiments are also included in the scope of this application.

Claims

1. A method for separating, enriching gold, iron, and nickel in electronic waste and continuously determining gold and nickel, characterized in that, It includes the following steps: S1. Mix the electronic waste containing iron, nickel, and gold with a reagent, add water for dissolution, and perform solid-liquid separation to obtain a gold-containing solid and a filtrate; S2. Add a dilution of a nickel chelating collector to the filtrate obtained in step S1 for extraction, separate the inorganic phase solution, add a reverse collector to the organic phase solution for back-extraction, and detect the nickel content; the structural formula of the nickel chelating collector is: ； S3. Adjust the pH value of the inorganic phase solution obtained in step S2 to a predetermined range to achieve the precipitation and purification of iron; S4. Dry the gold-containing solid obtained in step S1 and use the fire assay method to detect the gold content.

2. The method for separating, enriching gold, iron and nickel in electronic waste and continuously determining gold and nickel according to claim 1, characterized in that, In step S1, the reagent consists of sodium persulfate and sodium glycinate.

3. The method for separating, enriching gold, iron and nickel in electronic waste and continuously determining gold and nickel according to claim 2, characterized in that, The mass ratio of sodium persulfate to sodium glycinate is 1:(1~1.5).

4. The method for separating, enriching gold, iron, and nickel in electronic waste and continuously determining gold and nickel according to claim 2, wherein The mass ratio of the reagent to the electronic waste is (1~50):

1.

5. The method for separating, enriching gold, iron, and nickel in electronic waste and continuously determining gold and nickel according to claim 1, characterized in that, In step S2, the dilution of the nickel chelating collector is prepared by mixing the nickel chelating collector and sulfonated kerosene at a volume ratio of 1:(5~10).

6. The method for separating, enriching gold, iron and nickel in electronic waste and continuously determining gold and nickel according to claim 5, characterized in that, The volume ratio of the dilution of the nickel chelating collector to the filtrate is 1:(1~9).

7. The method for separating, enriching gold, iron, and nickel in electronic waste and continuously determining gold and nickel according to claim 1, characterized in that, In step S2, the reverse collector is a glutamic acid solution with a concentration of 30~50 g / L.

8. The method for separating, enriching gold, iron and nickel in electronic waste and continuously determining gold and nickel according to claim 7, characterized in that, The volume ratio of the reverse collector to the dilution of the nickel chelating collector is (10~50):

1.

9. The method for separating, enriching gold, iron and nickel in electronic waste and continuously determining gold and nickel according to claim 1, characterized in that, In step S1, the pH value of the filtrate is 8~9.

10. The method for separating, enriching gold, iron and nickel in electronic waste and continuously determining gold and nickel according to claim 1, characterized in that, In step S3, the pH value of the inorganic phase solution is 12~14.

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