Clean gold leaching agent system for treating gold-bearing minerals and gold leaching process

Abstract

The invention provides a clean gold leaching agent system for treating gold-bearing minerals and a gold leaching process, and belongs to the technical field of hydrometallurgy. According to the clean gold leaching agent system for treating the gold-bearing minerals, on the basis that thiosulfate serves as a gold leaching agent main body and metal cupric salt serves as a catalyst, a leaching auxiliary agent replacing ammonia, amine and ammonium is designed. In the gold leaching process, the leaching auxiliary agent and bivalent copper ions are subjected to chelation reaction at first, a copper-chelation product has moderate dissolving performance under the alkaline condition, the gain catalysis effect on gold leaching of thiosulfate is achieved, meanwhile, overflow of ammonia gas is avoided, and the leaching efficiency is improved. Clean extraction of gold in the gold-bearing minerals by the thiosulfate leaching system is achieved, a series of problems that in the prior art, the gold leaching effect is poor, ammonia gas overflows in the gold leaching process and the like due to the fact that copper ions of a copper ammonium system are converted into precipitates are solved, and a potential alternative scheme is provided for the field of hydrometallurgy of gold ores in the gold industry.

Description

Technical Field

[0001] The invention relates to the technical field of hydrometallurgy, and in particular to a clean gold leaching agent system and a gold leaching process for treating gold-containing minerals. Background Art

[0002] Thiosulfate gold leaching uses chlorination roasting-sodium thiosulfate leaching technology to treat gold and silver ores, which is called the Van Pattra process. In the late 1970s, studies found that Cu 2+ Can accelerate the dissolution of gold. Cu 2+ -NH 3 -S 2 O 3 2- The gold leaching system has the characteristics of fast leaching rate, low cost and good environmental protection, and is considered to be the most potential gold leaching process that is likely to replace cyanide gold leaching.

[0003] However, due to Cu 2+ -NH 3 -S 2 O 3 2- During the leaching process, the gold leaching system will cause the metal ion catalyst to be converted into a precipitate. For example, divalent copper ions are converted into copper hydroxide and attached to the gold surface, which hinders subsequent leaching, and the final gold leaching effect is unsatisfactory.

[0004] In order to solve the above problems, the existing thiosulfate gold leaching system is divided into a copper-containing gold leaching system and a copper-free gold leaching system by changing the type of auxiliary reagents in the leaching system. 2+ -NH 3 -S 2 O 3 2- , Cu 2+ -NH 4+ -S 2 O 3 2 -、Cu 2+ -EDTA-S 2 O 3 2- , Cu 2+ -en-S 2 O 3 2- etc., the copper-free system has Cl - -NH 3 -S 2 O 3 2- However, the existing auxiliary agents are mainly ammonia, ammonium and amine compounds, and a large amount of ammonia gas is inevitably generated during use, which affects the on-site working environment.

[0005] In view of this, it is necessary to design an improved clean gold leaching agent system and gold leaching process for treating gold-containing minerals to solve the above problems. Summary of the invention

[0006] The purpose of this application is to provide a clean gold leaching agent system and gold leaching process for treating gold-containing minerals. By designing the components of leaching auxiliary agents, the clean extraction of gold from gold-containing minerals by the thiosulfate leaching system is achieved, and a series of problems existing in the existing thiosulfate leaching system, such as poor gold leaching effect and ammonia overflow during the leaching process, are solved, providing a potential alternative solution for the hydrometallurgical field of gold mines in the gold industry.

[0007] The embodiment of the present application provides a clean gold leaching agent system for treating gold-containing minerals, including a gold leaching agent body, a catalyst, and a leaching auxiliary agent; the gold leaching agent body is thiosulfate, the catalyst is a metal divalent copper salt, and the molecular structure of the leaching auxiliary agent is as follows:

[0008]

[0009] As a further improvement of the present invention, in the clean gold leaching agent system for treating gold-containing minerals, the mass concentration of the gold leaching agent body is 30-100 g / L, the mass concentration of the catalyst is 0.1-1 g / L, and the mass concentration of the leaching auxiliary agent is 1-5 g / L.

[0010] As a further improvement of the present invention, the leaching auxiliary agent is obtained by using the Cardo ring as a skeleton and introducing diacylhydroxamic acid structural fragments at both ends.

[0011] As a further improvement of the present invention, the thiosulfate is one or more of sodium thiosulfate, potassium thiosulfate, and calcium thiosulfate.

[0012] As a further improvement of the present invention, the metal divalent copper salt is one or more of copper sulfate, copper chloride, copper nitrate, and copper glycinate.

[0013] As a further improvement of the present invention, the cleaning gold leaching agent system for treating gold-containing minerals is used in an environment with a pH of 8-10.

[0014] The embodiment of the present application also provides a gold leaching process, which uses the clean gold leaching agent system for treating gold-containing minerals described in the above scheme to leaching gold, including the following steps:

[0015] S1, crushing the gold-containing material to a particle size of -0.074 mm, wherein the ore powder accounts for 75% to 85% of the total mass of the material, and adding water to adjust the slurry to a mass percentage concentration of 30% to 35%;

[0016] S2, adjusting the pH of the slurry prepared in step S1 to 8-10, then adding the main body of the gold leaching agent, the catalyst and the leaching auxiliary agent to the slurry; under alkaline conditions, stirring and leaching for 4-12 hours at normal temperature and pressure, solid-liquid separation, and leaching gold.

[0017] As a further improvement of the present invention, in step S1, the gold-containing material includes one or more of bio-oxidation slag, bio-oxidation heap leaching slag, roasted sand, flotation gold concentrate, oxidized copper-gold ore, and gold-containing waste circuit boards.

[0018] As a further improvement of the present invention, in step S2, sodium hydroxide is used to adjust the pH value of the slurry.

[0019] The beneficial effects of the present invention are:

[0020] 1. The present invention provides a clean gold leaching agent system for treating gold-containing minerals, wherein the leaching auxiliary agent in the gold leaching agent system is obtained by introducing a diacylhydroxamic acid structural fragment at both ends with a Cardo ring as a skeleton. The unique spatial structure of the leaching auxiliary agent can selectively chelate copper ions and avoid reaction with other types of metals. In addition, the molecular structure contains a Cardo ring structural fragment, which isolates the diacylhydroxamic acid structural fragments at both ends of the same molecule, thereby preventing intramolecular chelation of copper ions, ensuring that the stability of the copper-containing chelate is moderate, and avoiding the phenomenon that the stability of the copper chelate is too large to realize the reversible transformation of the multi-copper state of the system. At the same time, it also avoids the copper chelate stability being too small to realize the dominant proportion of the thermodynamic phase of the copper-chelate in the copper leaching gold process.

[0021] 2. The leaching auxiliary agent in the clean gold leaching agent system for treating gold-containing minerals of the present invention first undergoes a chelating reaction with divalent copper ions during the gold leaching process. The copper-chelated product has moderate solubility under alkaline conditions, which has a catalytic effect on the gold leaching of thiosulfate (thiosulfate ion) and avoids the overflow of ammonia. The reaction process is as follows:

[0022]

[0023] Au+5S 2 O 3 2- +Cu[R] 2 2- →Au(S 2 O 3 ) 2 3- +Cu(S 2 O 3 ) 3 5- +2R 2-

[0024] Among them, R 2- for

[0025]

[0026] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solution of the present application, the following is a brief introduction to the drawings used in the present application. Obviously, the drawings described below are only some embodiments of the present application, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0028] Figure 1 The synthetic route of the leaching auxiliary agent in this application is shown in FIG.

[0029] Figure 2 NMR of the leaching auxiliary agent in this application 1 H-NMR spectrum.

[0030] Figure 3 The figure is a diagram of the chemical molecular structure of the leaching auxiliary agent in this application.

[0031] Figure 4 This is a morphological photograph of the leached gold powder in Example 10.

[0032] Figure 5 This is a morphology photograph of the leached gold powder in Comparative Example 10. DETAILED DESCRIPTION

[0033] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians 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" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0035] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0036] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0037] Existing auxiliary agents are mainly ammonia, ammonium, and amine compounds. There is a problem that divalent copper ions are converted into copper hydroxide and attached to the gold surface, which hinders subsequent leaching and leads to poor gold leaching effect. During use, a large amount of ammonia gas cannot be avoided, affecting the on-site working environment.

[0038] The present invention provides a clean gold leaching agent system for treating gold-containing minerals, comprising a gold leaching agent body, a catalyst and a leaching auxiliary agent. In the clean gold leaching agent system for treating gold-containing minerals, the mass concentration of the gold leaching agent body is 30-100 g / L, the mass concentration of the catalyst is 0.1-1 g / L, and the mass concentration of the leaching auxiliary agent is 1-5 g / L. The gold leaching agent body is thiosulfate, the catalyst is a metal divalent copper salt,

[0039] The thiosulfate is one or more of sodium thiosulfate, potassium thiosulfate and calcium thiosulfate. The metal divalent copper salt is one or more of copper sulfate, copper chloride, copper nitrate and copper glycinate.

[0040] The molecular structure of the leaching auxiliary agent is as follows:

[0041]

[0042] See also Figures 1 to 3 As shown, the leaching auxiliary agent is based on the Cardo ring as the skeleton, and introduces diacyl hydroxamic acid structural fragments at both ends. The overall molecular structure of the leaching auxiliary agent is presented in the form of a "bird". Among them, the "bird body" comes from the Cardo ring of the derivative chemical of bisphenol fluorene, and the three-membered ring formed is coplanar, which reduces the torsional tension of the entire molecular structure; the "two wings" present a phenyl ether structure, which is conducive to the free rotation of the benzene rings on both sides of the oxygen atom, and can reduce the steric hindrance of the molecule; the end position of the "two wings" is the acyl hydroxamic acid structural fragment, which is the activated chelating point of the leaching auxiliary agent to achieve chelation with divalent copper ions.

[0043] Specifically, the preparation method of the leaching auxiliary agent comprises the following steps:

[0044] A1. Add 0.5 mol of bisphenol fluorene into a 3L three-necked round-bottom flask and dissolve the bisphenol fluorene in a mixed solution of 1L of DMF and 1L of toluene; after the bisphenol fluorene is dissolved, add 1 mol of anhydrous potassium carbonate into the above suspension, heat to reflux, and remove the generated water and toluene by azeotropic distillation; when no more water is generated, remove the excess toluene by distillation; after the above reaction is completed, reduce the system temperature to 50-60°C, add 1-1.2 mol of p-fluorobenzonitrile (B), and then increase the system temperature to 150-180°C and react for 6-8h; after the reaction is completed, add the suspension into water while hot to produce a large amount of white powdery crude product, which is first filtered and extracted for purification, then repeatedly washed with water and methanol solution, and vacuum dried to obtain compound C, wherein the yield is 90-92%;

[0045] A2. Transfer 0.2-0.5 mol of compound C to a 5L three-necked flask and dissolve it in anhydrous tetrahydrofuran solution under nitrogen protection. At this time, the molar concentration of compound C is 2-5 mol / L.

[0046] 1-3 mol of lithium aluminum hydride is added to anhydrous tetrahydrofuran under nitrogen protection, stirred for 30 minutes, and transferred to a constant pressure titration funnel to obtain a lithium aluminum hydride suspension;

[0047] The three-necked flask containing the mixed solution of compound C and anhydrous tetrahydrofuran solution prepared above is placed in an ice-water bath, and under the protection of nitrogen atmosphere, the prepared lithium aluminum hydride suspension is added dropwise using a constant pressure titration funnel, and the reaction is carried out for 24 to 48 hours; after the reaction is completed, it is filtered; then the liquid is collected, and the solvent in the liquid is removed by vacuum rotary evaporation, and the residue is dissolved in a chloroform solution, and the chloroform solvent is removed by vacuum rotary evaporation again, and finally an oily colorless oil D is collected, wherein the yield is 78 to 81%;

[0048] A3, 0.1-0.2 mol of oily substance D is put into a 3L three-necked flask, and 1L of ethanol solution and 1 mol of sodium ethoxide are added in sequence, and stirred for 0.5-1h; then 0.15-0.3 mol of N-hydroxybenzenesulfonamide is added thereto, and the mixture is reacted for 6-8h in an ice-water bath; after the reaction is completed, the temperature is restored to room temperature; then, the solvent methanol is removed under rotary evaporation vacuum conditions, and the residue is dissolved in 500 ml of ether; after complete dissolution, it is extracted with 2 mol / L NaOH, and the aqueous phase is collected; then, the aqueous phase is acidified with hydrochloric acid, and extracted with ethyl acetate. After the extraction is completed, the ethyl acetate is removed by rotary evaporation vacuum, and finally the residual oily substance is collected to obtain a leaching auxiliary agent.

[0049] The leaching auxiliary agent1 H-NMR spectrum Figure 2 As shown, the corresponding chemical molecular structure is shown in Figure 3 shown.

[0050] The present invention also provides a gold leaching process, which uses the above-mentioned clean gold leaching agent system for treating gold-containing minerals to leaching gold, comprising the following steps:

[0051] S1, crushing the gold-containing material to a particle size of -0.074 mm, wherein the ore powder accounts for 75% to 85% of the total mass of the material, and adding water to adjust the slurry to a mass percentage concentration of 30% to 35%;

[0052] Among them, the gold-containing materials include one or more of bio-oxidation slag, bio-oxidation heap leaching slag, roasted sand, flotation gold concentrate, oxidized copper-gold ore, and gold-containing waste circuit boards.

[0053] The main component of the gold leaching agent is thiosulfate. Specifically, the thiosulfate is one or more of sodium thiosulfate, potassium thiosulfate, and calcium thiosulfate.

[0054] The catalyst is a metal divalent copper salt. Specifically, the metal divalent copper salt is one or more of copper sulfate, copper chloride, copper nitrate, and copper glycinate.

[0055] S2, adjusting the pH of the slurry prepared in step S1 to 8-10, then adding the main body of the gold leaching agent, the catalyst and the leaching auxiliary agent to the slurry; under alkaline conditions, stirring and leaching for 4-12 hours at normal temperature and pressure, solid-liquid separation, and leaching gold.

[0056] Among them, sodium hydroxide is used to adjust the pH value of the slurry.

[0057] The leaching auxiliary agent of the present invention first undergoes a chelating reaction with divalent copper ions during the gold leaching process, and the copper-chelated product has moderate solubility under alkaline conditions, which has a catalytic effect on the gold leaching of thiosulfate (thiosulfate ion) and avoids the overflow of ammonia.

[0058] The reaction process is as follows:

[0059]

[0060] Au+5S 2 O 3 2- +Cu[R] 2 2- →Au(S 2 O 3 ) 2 3- +Cu(S 2 O 3 )3 5- +2R 2-

[0061] Among them, R 2- for

[0062]

[0063] Some specific embodiments are listed below. 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 limiting the present application. If specific techniques or conditions are not specified in the embodiments, the techniques or conditions described in the literature in this area or the product specifications are used. The reagents or instruments used without specifying the manufacturer are all conventional products that can be obtained commercially.

[0064] Example 1

[0065] This embodiment provides a gold leaching process, which uses a clean gold leaching agent system for treating gold-containing minerals to leaching gold, including the following steps:

[0066] The gold-bearing material used in the test is a low-grade gold-bearing mineral, and the gold grade in the ore is 0.6g / t.

[0067] S1, crushing the gold-containing material to a particle size of -0.074 mm, wherein the ore powder accounts for 75% to 85% of the total mass of the material, and adding water to adjust the slurry to a mass percentage concentration of 33%.

[0068] S2, adjust the ore pulp prepared in step S1 to a pH of 8 with sodium hydroxide. Then, add 50 g / L of the main gold leaching agent (sodium thiosulfate), 0.2 g / L of the catalyst (copper sulfate), and 3 g / L of the leaching auxiliary agent. Under alkaline conditions, stir and leach for 6 hours at room temperature and pressure, separate the solid and liquid, and leach gold.

[0069] Examples 2-3 and Comparative Examples 1-3

[0070] Compared with Example 1, the main difference is that the pH value of the slurry in step S2 is changed, and other experimental parameters and conditions are basically the same as those in Example 1, which will not be repeated here. The details are shown in the following table.

[0071]

[0072] The gold leaching rates in Examples 1-3 and Comparative Examples 1-3 are shown in the following table.

[0073] Gold leaching rate (%) Example 1 92 Example 2 92 Example 3 94 Comparative Example 1 57 Comparative Example 2 82 Comparative Example 3 62

[0074] As can be seen from the above table, the leaching rate of gold in Examples 1-3 all reached more than 90%, indicating that the introduction of leaching auxiliary agents can achieve efficient leaching of gold from the ore. However, there is an optimal pH range for the use of leaching auxiliary agents. When the pH is lower than this range, the leaching rate of gold is low and the leaching effect is poor.

[0075] The main reason is that when pH≤7, the solubility of the leaching auxiliary agent is poor, the leaching auxiliary agent precipitates from the aqueous phase, and cannot effectively chelate with the copper ions in the aqueous phase. As the pH of the solution system decreases, the gold leaching effect further shows a downward trend. The main reason is that thiosulfate is easily decomposed under acidic conditions, affecting the concentration of the main body of the gold leaching agent, causing the gold leaching effect to further deteriorate under the original indicators, from 82% to 57%. At the same time, when pH≥11, the gold leaching rate drops from 92% to 62%. The main reason is that the acyl hydroxamic acid structure fragment in the molecular structure of the leaching auxiliary agent is easily decomposed under strong alkaline conditions.

[0076] Example 4-5 and Comparative Example 4-5

[0077] Compared with Example 1, the main difference is that the mass concentration of sodium thiosulfate, the main body of the gold leaching agent in step S2, is changed, and other experimental parameters and conditions are basically the same as those in Example 1, which will not be repeated here. The details are shown in the following table.

[0078]

[0079] The gold leaching rates in Examples 1, 4-5 and Comparative Examples 4-5 are shown in the following table.

[0080] Gold leaching rate (%) Example 1 92 Example 4 95 Example 5 94 Comparative Example 4 84 Comparative Example 5 92

[0081] As can be seen from the above table, the leaching rates of gold in Examples 1 and 4-5 all reached more than 90%, indicating that the introduction of leaching auxiliary agents can achieve efficient leaching of gold in the ore. However, there is an optimal concentration range for the mass concentration of sodium thiosulfate. When the concentration is lower than this range, the leaching rate of gold is low and the leaching effect is poor; when the concentration exceeds this range, the leaching effect remains constant and the leaching rate of gold no longer changes significantly.

[0082] Examples 6-7 and Comparative Examples 6-7

[0083] Compared with Example 1, the main difference is that the mass concentration of the catalyst copper sulfate in step S2 is changed, and other experimental parameters and conditions are basically the same as those in Example 1, which will not be repeated here. The details are shown in the following table.

[0084]

[0085] The gold leaching rates in Examples 1, 6-7 and Comparative Examples 6-7 are shown in the following table.

[0086] Gold leaching rate (%) Example 1 92 Example 6 92 Example 7 93 Comparative Example 6 72 Comparative Example 7 79

[0087] As can be seen from the above table, the leaching rate of gold in Examples 1 and 6-7 all reached more than 90%, indicating that the introduction of leaching auxiliary agents can achieve efficient leaching of gold in the ore. However, there is an optimal concentration range for the amount of catalyst (copper sulfate). When it is lower than this range, the leaching rate of gold is low and the leaching effect is poor. The main reason is that the amount of catalyst (copper sulfate) is insufficient and the optimal leaching parameters are not reached; when it exceeds this range, the leaching effect shows a downward trend. The main reason is that due to excessive catalyst (copper sulfate) and insufficient amount of leaching auxiliary agents, some copper ions are in a free state. Under alkaline conditions, they are converted into copper hydroxide precipitation attached to the surface of gold, affecting the subsequent leaching of gold.

[0088] Examples 8-9 and Comparative Examples 8-9

[0089] Compared with Example 1, the main difference is that the mass concentration of the leaching auxiliary agent in step S2 is changed, and other experimental parameters and conditions are basically the same as those in Example 1, which will not be repeated here. The details are shown in the following table.

[0090]

[0091] The gold leaching rates in Examples 1, 8-9 and Comparative Examples 8-9 are shown in the following table.

[0092] Gold leaching rate (%) Example 1 92 Example 8 94 Example 9 92 Comparative Example 8 87 Comparative Example 9 92

[0093] As can be seen from the above table, the leaching rate of gold in Examples 1 and 8-9 all reached more than 90%, indicating that the introduction of leaching auxiliary agents can achieve efficient leaching of gold in ore. However, there is an optimal concentration range for the dosage of leaching auxiliary agents. When it is lower than this range, the leaching rate of gold is low and the leaching effect is poor. The main reason is that the dosage of leaching auxiliary agents is insufficient, and some free copper ions cannot be completely chelated with the leaching auxiliary agents, and a small amount of copper hydroxide is produced under alkaline conditions, which adheres to the gold surface and inhibits subsequent leaching; when it exceeds this range, the leaching effect shows a stable trend. At the same time, excessive leaching auxiliary agents do not have a significant negative impact on the leaching effect of gold.

[0094] Example 10

[0095] In order to observe the influence of different types of catalysts (metal salts) on gold leaching behavior more objectively and directly.

[0096] This embodiment provides a gold leaching process, which uses a clean gold leaching agent system for treating gold-containing minerals to leaching gold, including the following steps:

[0097] The gold-containing material used in the test is pure gold powder.

[0098] S1, adding deionized water to the gold powder to prepare a slurry to a mass percentage concentration of 1%;

[0099] S2, adjust the pure gold powder slurry prepared in step S1 to a pH of 8 with sodium hydroxide; then, add 50g / L of the main gold leaching agent (sodium thiosulfate), 0.2g / L of the catalyst (copper sulfate), and 3g / L of the leaching auxiliary agent. Under alkaline conditions, stir and leach for 6 hours at room temperature and pressure, separate the solid and liquid, and leach the gold.

[0100] The surface morphology of the gold powder after leaching was observed by scanning electron microscopy (SEM). Figure 4 As shown. The situation of the catalyst on the gold powder surface being converted into a precipitate was determined. It can be seen that under the conditions of this system, no copper-containing compound precipitate was found to be adsorbed on the gold powder surface. This proves that the leaching auxiliary agent can effectively chelate with the copper salt catalyst, and no copper hydroxide precipitate is produced to adhere to the gold surface, which is conducive to the positive leaching reaction of gold.

[0101] Comparative Example 10

[0102] Compared with Example 10, the difference is that in step S2, the catalyst is replaced by aluminum sulfate, and the rest is roughly the same as Example 10 and will not be repeated here.

[0103] The surface morphology of the gold powder after leaching was observed by scanning electron microscopy (SEM). Figure 5 shown.

[0104] It can be seen that under the conditions of this system, aluminum-containing compound precipitation was found to be adsorbed on the surface of gold powder. This proves that the leaching auxiliary agent and the aluminum salt catalyst cannot effectively chelate, resulting in aluminum-containing compound precipitation attached to the gold surface, hindering the leaching of gold.

[0105] Comparative Example 11

[0106] Compared with Example 10, the difference is that in step S2, the catalyst is replaced by ferrous sulfate, and the rest is substantially the same as Example 10 and will not be repeated here.

[0107] Experiments show that under the conditions of this system, iron-containing compounds precipitate and adsorb on the surface of gold powder. This proves that the leaching auxiliary agent and the iron salt catalyst cannot effectively chelate, resulting in iron-containing compound precipitation attached to the gold surface, hindering the leaching of gold.

[0108] Depend on Figures 4 to 5It can be seen that the leaching auxiliary agent has different effects on different types of catalysts. The leaching auxiliary agent can effectively inhibit the formation of copper compound precipitation. When aluminum salts and ferrous salts are used as catalysts, the formation of aluminum and iron compound precipitation cannot be avoided. The main reason is that the unique spatial structure of the leaching auxiliary agent ensures that copper ions can be selectively chelated to avoid reactions with other types of metals. Furthermore, when copper salts are used as catalysts, no copper compound precipitation is formed on the surface of the gold powder after leaching, while when aluminum and iron salt catalysts are used, aluminum and iron compound precipitation is attached to the surface of the gold powder after leaching.

[0109] Experiments show that when the main body of the gold leaching agent is replaced with potassium thiosulfate or calcium thiosulfate, and the catalyst is replaced with copper chloride, copper nitrate or copper glycinate, the gold leaching rate can reach more than 90%.

[0110] It should be noted that the present application is not limited to the above-mentioned embodiments. The above-mentioned embodiments are only examples, and the embodiments having the same structure as the technical idea and the same effect as the technical solution of the present application are all included in the technical scope of the present application. In addition, without departing from the scope of the main purpose of the present application, various modifications that can be thought of by those skilled in the art to the embodiments and other methods of combining some of the constituent elements in the embodiments are also included in the scope of the present application.

Claims

1. A clean gold leaching agent system for treating gold-containing minerals, characterized in that: It includes a gold leaching agent body, a catalyst and a leaching auxiliary agent; the gold leaching agent body is thiosulfate, the catalyst is a metal divalent copper salt, and the molecular structure of the leaching auxiliary agent is as follows:

2. The clean gold leaching agent system for treating gold-containing minerals according to claim 1, characterized in that: In the clean gold leaching agent system for treating gold-containing minerals, the mass concentration of the gold leaching agent body is 30-100 g / L, the mass concentration of the catalyst is 0.1-1 g / L, and the mass concentration of the leaching auxiliary agent is 1-5 g / L.

3. The clean gold leaching agent system for treating gold-containing minerals according to claim 1, characterized in that: The leaching auxiliary agent is obtained by using Cardo ring as a skeleton and introducing diacylhydroxamic acid structural fragments at both ends.

4. The clean gold leaching agent system for treating gold-containing minerals according to claim 1, characterized in that: The thiosulfate is one or more of sodium thiosulfate, potassium thiosulfate and calcium thiosulfate.

5. The clean gold leaching agent system for treating gold-containing minerals according to claim 1, characterized in that: The metal divalent copper salt is one or more of copper sulfate, copper chloride, copper nitrate and copper glycinate.

6. The clean gold leaching agent system for treating gold-containing minerals according to claim 1, characterized in that: The cleaning gold leaching agent system for treating gold-containing minerals is used in an environment with a pH value of 8-10.

7. A gold immersion process, characterized in that: The clean gold leaching agent system for treating gold-containing minerals according to any one of claims 1 to 6 is used for gold leaching, comprising the following steps: S1, crushing the gold-containing material to a particle size of -0.074 mm, wherein the ore powder accounts for 75% to 85% of the total mass of the material, and adding water to adjust the slurry to a mass percentage concentration of 30% to 35%; S2, adjusting the pH of the slurry prepared in step S1 to 8-10, then adding the main body of the gold leaching agent, the catalyst and the leaching auxiliary agent to the slurry; under alkaline conditions, stirring and leaching for 4-12 hours at normal temperature and pressure, solid-liquid separation, and leaching gold.

8. The immersion gold process according to claim 7, characterized in that: In step S1, the gold-containing material includes one or more of bio-oxidation slag, bio-oxidation heap leaching slag, roasted sand, flotation gold concentrate, oxidized copper-gold ore, and gold-containing waste circuit boards.

9. The immersion gold process according to claim 7, characterized in that: In step S2, sodium hydroxide is used to adjust the pH value of the slurry.

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