A method for leaching gold using thiosulfate catalyzed by a solid catalyst

Abstract

The present invention relates to a method for catalyzing thiosulfate gold leaching with a solid catalyst, and belongs to the technical field of hydrometallurgical production of precious metal gold. After grinding the gold ore, the slurry is adjusted to a gold ore pulp with a concentration of 10-40wt%; molybdenum disulfide solid powder or molybdenum disulfide nano suspension is added to the gold ore pulp, and then thiosulfate is added. After adjusting the pH to 9-12, gold is leached under light conditions, filtered to obtain a gold leaching liquid, and the filtered molybdenum disulfide is washed and reused; or molybdenum disulfide ink is applied to the container wall, gold ore pulp is added, thiosulfate is added, and after adjusting the pH to 9-12, gold is leached under light conditions, filtered to obtain a gold leaching liquid, and the molybdenum disulfide ink applied to the container wall is washed and reused. The present invention uses molybdenum disulfide as a solid catalyst, and can efficiently catalyze the method for thiosulfate gold leaching under normal conditions. The present invention has the characteristics of high efficiency, cleaning and strong versatility.

Description

Technical Field

[0001] The invention relates to a method for leaching gold with thiosulfate catalyzed by a solid catalyst, belonging to the technical field of producing precious metal gold by hydrometallurgy. Background Art

[0002] In the hydrometallurgical process, the leaching process is the key process, in which the type of gold leaching agent directly affects the gold recovery rate and leaching rate. Since the advent of cyanide gold leaching in the 1880s, it has been the mainstream hydrometallurgical process and has been widely adopted due to its simple operation, stable complex, high gold recovery rate, and low equipment and reagent costs. However, cyanide is highly toxic and is a national controlled substance, which is difficult to transport and store. In addition, when treating low-grade or difficult-to-treat ores, the reagent consumption of cyanide is large, and the gold leaching process is more sensitive to the associated metals in the ore. The thiosulfate gold leaching process has the advantages of environmental friendliness, good gold leaching effect, low cost and simple operation. This process has good selectivity when treating difficult-to-treat gold ores containing copper, carbon, arsenic, etc., and is the most promising alternative process for cyanide gold leaching. At present, the low stability and high consumption of thiosulfate are the main obstacles to the promotion of sulfur-containing gold leaching agents. The commonly used copper-ammonia-thiosulfate ( ) catalytic system. During the oxidation process (reaction equation 2), Cu(II) is reduced to Cu(I), and Cu(I) is again Oxidized to Cu(II), realizing the recycling of oxidant. Prone to metastable states Decomposition, formation This not only causes excessive consumption of thiosulfate, but also some of its decomposition products cover the gold surface to form a passivation layer, which will greatly reduce the leaching rate of gold. At the same time, the ion environment in the leachate is complex, which makes it difficult to recover gold in the leachate.

[0003] The reaction formula for thiosulfate leaching of gold is:

[0004] ;

[0005] The reaction formula for copper-ammonia catalyzed thiosulfate leaching of gold is:

[0006] ;

[0007] At present, there are few reports on new catalytic systems. Existing studies include: Barrick Gold Corporation uses of The system leaches a carbonaceous sulfide gold ore unique to the Goldstrike mine in Nevada, USA, but It will also cause Oxidative decomposition leads to The consumption is high, and the system has poor applicability to ore types. Studies have found that new gold leaching systems such as copper-polyamine compounds-thiosulfate, copper-citrate-thiosulfate, and copper-tartrate-thiosulfate are used. Hu Xianzhi et al. studied the copper-polyamine compound (ethylenediamine, diethylenetriamine, and triethylenetetramine, etc.)-thiosulfate gold leaching system. XIE F et al. studied the effect of copper-citrate-thiosulfate system on gold leaching.

[0008] However, due to The above copper-based catalytic system still cannot avoid the recovery of gold in the leaching solution. and The difficulty of desorption of gold caused by co-adsorption on the resin. The problem of complex ion environment of the leaching solution is difficult to solve, and there is no report on the solid catalyst catalytic leaching gold system.

[0009] Molybdenum disulfide is a disulfide compound of transition metals with a layered structure, which is widely used in the petroleum industry as a catalyst for hydrodesulfurization. As a catalyst in the petroleum industry, molybdenum disulfide must be limited to high pressure and acidic conditions to show its catalytic activity. Under these harsh reaction conditions, the sulfur atoms at the edges of the molybdenum disulfide crystals that play a bridging role and the edges of the crystals will be lost. In the process of hydrodesulfurization in the petroleum industry, these molybdenum disulfide crystal edge planes will show high activity. Therefore, molybdenum disulfide can be used as a catalyst for hydrodesulfurization and other treatment processes in the petroleum industry under harsh reaction conditions such as high pressure and acidity.

[0010] Recent studies have found that molybdenum disulfide also has good catalytic performance for hydrogen evolution reaction. However, as a primitive layered structure, molybdenum disulfide itself has very poor catalytic performance for hydrogen evolution. It is necessary to process the structure of molybdenum disulfide or combine other materials with molybdenum disulfide to form a new catalyst to improve the catalytic performance.

[0011] The patent application number is 2018103017619, a molybdenum disulfide for catalyst and its preparation method and application, the molybdenum disulfide raw material is placed in a water vapor atmosphere for heating reaction to obtain a molybdenum disulfide catalyst with high catalytic activity. The invention causes the sulfur atoms in the molybdenum disulfide to be etched by water vapor to form sulfur defects, and this defect makes the treated molybdenum disulfide catalyst have higher catalytic activity.

[0012] Patent application number is 2021109817677, a molybdenum disulfide / cobalt carbon nanotube catalyst and its preparation method and application, using a tubular furnace in Cobalt carbon nanotubes were prepared by calcination in an atmosphere, and molybdenum disulfide was further grown in situ by a hydrothermal method, and then calcined in a tubular furnace to obtain Electrocatalyst. The catalyst has high activity and good stability for electrocatalytic hydrogen evolution reaction.

[0013] In addition, there are also some molybdenum-based synthetic catalysts with catalytic applications in other fields. The patent application number is 2021103133448. A molybdenum-based catalyst with in-plane defects and its preparation method and application, using molybdenum pentachloride as the molybdenum source, thiourea as the sulfur source and sulfur-capping agent, by feeding in batches, utilizing the coordination and complexation of the two, a molybdenum disulfide catalyst is prepared by a bottom-up method and applied to the electrochemical synthesis of ammonia reaction.

[0014] However, the above molybdenum disulfide can only become an efficient catalyst after being treated to improve its catalytic performance, or forming a new molybdenum-based synthetic catalyst, or under harsh reaction conditions such as high pressure and acidity. There is no report in the prior art that molybdenum disulfide is used as a catalyst under conventional reaction conditions in the field of hydrometallurgy. Summary of the invention

[0015] In view of the problems and shortcomings of the above-mentioned prior art, the present invention provides a method for leaching gold with thiosulfate using a solid catalyst. The present invention uses molybdenum disulfide as a solid catalyst and can efficiently catalyze the leaching gold with thiosulfate under normal conditions. The present invention has the advantages of high efficiency, cleaning and strong versatility.

[0016] The present invention is achieved through the following technical solutions.

[0017] A method for leaching gold with thiosulfate using a solid catalyst, comprising the following steps:

[0018] (1) Grinding the gold ore and adjusting the slurry to a gold ore slurry with a concentration of 10-40wt%;

[0019] (2) adding molybdenum disulfide solid powder or molybdenum disulfide nano suspension to the gold ore slurry, then adding thiosulfate, adjusting the pH to 9-12, leaching gold under light conditions, filtering to obtain a gold leaching solution, and washing the filtered molybdenum disulfide for reuse;

[0020] Alternatively, molybdenum disulfide ink is applied to the container wall, gold ore slurry is added, and then thiosulfate is added. After adjusting the pH to 9-12, gold is leached under light conditions, and the gold leaching liquid is filtered to obtain the molybdenum disulfide ink applied to the container wall and then reused after washing.

[0021] In step (2), the thiosulfate is sodium thiosulfate, potassium thiosulfate or ammonium thiosulfate, and the initial concentration of the thiosulfate in the gold ore pulp is 0.01-1 mol / L.

[0022] In the step (2), the molybdenum disulfide solid powder has a purity of 98-99.98%, and the particle size of -8 μm accounts for more than 90%.

[0023] The concentration of the molybdenum disulfide nanosuspension in step (2) is 1-5 mg / mL.

[0024] The density of the molybdenum disulfide ink in step (2) is 0.58-0.98 g / mL.

[0025] In the step (2), the concentration of molybdenum disulfide in the gold ore slurry is 0.0001-1 mol / L.

[0026] The illumination conditions in step (2) may be indoor natural light, outdoor natural light, a 100-800W high pressure mercury lamp or a 100-800W xenon lamp, and the wavelength of the illumination conditions may be 150-1500nm.

[0027] In step (2), the gold leaching is carried out in an air atmosphere at a temperature of 0-40° C. and a stirring rate of 100-500 r / min for 4-12 hours.

[0028] The preparation process of the above-mentioned molybdenum disulfide nano suspension is as follows: nano molybdenum disulfide is added into pure water, and then subjected to ultrasonic treatment to obtain a molybdenum disulfide nano suspension with a concentration of 1-5 mg / mL.

[0029] The preparation process of the molybdenum sulfide ink is as follows: nano molybdenum disulfide is added to an organic dispersant and subjected to high temperature. The molybdenum sulfide ink is commercially available.

[0030] The invention provides three methods for adding molybdenum disulfide: adding molybdenum disulfide solid powder, adding molybdenum disulfide nano suspension, and applying molybdenum disulfide ink on the container wall.

[0031] The beneficial effects of the present invention are:

[0032] (1) The technical field of the present invention is the field of metallurgical gold leaching, which is completely different from and not similar to the fields of petroleum industry, catalytic hydrogen evolution, and electrochemical ammonia synthesis in which molybdenum disulfide is used as a catalyst in the prior art. It is not easy to think of directly applying the catalysts in the fields of petroleum industry, catalytic hydrogen evolution, and electrochemical ammonia synthesis to the field of metallurgical gold leaching of the present invention.

[0033] (2) The present invention uses solid catalyst molybdenum disulfide to catalyze thiosulfate leaching of gold. There is no need to perform specific treatment on the solid catalyst molybdenum disulfide or synthesize a new molybdenum-based catalyst. In the thiosulfate leaching environment, molybdenum disulfide can provide abundant active sites for thiosulfate leaching of gold only through its layered structure, thereby accelerating the dissolution of gold and preventing The decomposition of molybdenum disulfide enhances the stability of thiosulfate and significantly improves the leaching rate and leaching rate. In addition, molybdenum disulfide generates photogenerated electrons and holes under light, reacts with various components in the solution to produce a variety of free radicals, and promotes the oxidation process of gold. Compared with the traditional thiosulfate leaching system, the catalytic leaching method of the present invention has a maximum leaching rate of 90.1% for oxidized gold ores in the first stage, and the leaching rate is only about 51.2% without a catalyst. The leaching rate of copper-ammonia catalyzed first stage leaching is up to 78.9%.

[0034] (3) In the leaching process of the present invention, the ion environment is simple and the catalytic effect is stable, and it can be applied to high-arsenic and high-copper difficult-to-leach gold mines. For arsenic-containing Carlin-type gold mines, the stability of the traditional ionic liquid catalytic system is poor. The leaching rate of the first stage in the absence of a catalyst is only 38.6%, while the leaching rate of the first stage of the catalytic leaching method of the present invention is up to 73.2%. For high-copper gold mines, the leaching rate of the first stage in the absence of a catalyst is only 19.8%, while the leaching rate of the first stage of the catalytic leaching method of the present invention is up to 75.1%.

[0035] (4) The leaching method of the present invention uses a solid catalyst, which has a stable structure and is easy to recover. It can be directly cleaned and reused without special treatment.

[0036] (5) The present invention selects different ways of adding molybdenum disulfide for different types of gold ores. Under the different ways of adding, the best catalytic performance is obtained, and efficient leaching of different types of gold ores is achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 This is a physical operation diagram of the method for leaching gold with thiosulfate catalyzed by a solid catalyst of the present invention; DETAILED DESCRIPTION

[0038] The present invention will be further described below in conjunction with specific implementation modes.

[0039] This embodiment mainly performs gold leaching on the following two types of gold ore raw materials.

[0040] Gold ore raw materials:

[0041] Raw materials of No. 1 gold mine: typical arsenic-containing Carlin-type refractory gold ore, with a gold grade of 30g / t, a sulfur content of 24%, and an arsenic content of 28%.

[0042] Raw materials of No. 2 gold mine: typical oxidized gold mine, with a gold grade of 9g / t, a sulfur content of 0.08%, and the main gangue is quartz.

[0043] Raw materials for No. 3 gold mine: pre-enriched flotation copper concentrate with a gold grade of 45g / t, a copper content of 14% and a sulfur content of 33%.

[0044] The consumption of sodium thiosulfate in the following examples is calculated by subtracting the residual concentration of thiosulfate in the gold leaching solution after the gold leaching is completed from the initial concentration of thiosulfate.

[0045] Example 1

[0046] like Figure 1 As shown, the method for leaching gold with thiosulfate catalyzed by the solid catalyst comprises the following steps:

[0047] (1) Grinding the gold ore (No. 1 gold ore raw material) to a particle size of -18 μm accounting for 95%, and slurrying to a gold ore slurry with a concentration of 15 wt%;

[0048] (2) Molybdenum disulfide solid powder and thiosulfate (sodium thiosulfate pentahydrate) were added to the gold ore slurry to a concentration of 0.006 mol / L and 0.35 mol / L respectively; after adjusting the pH to 10.5 with sodium hydroxide, the gold was leached for 10 h at a stirring rate of 450 r / min and a slurry temperature of 20°C under natural light indoors, and the gold leaching solution was filtered out. The filtered molybdenum disulfide was washed and reused.

[0049] The results of gold leaching in this example are shown in Table 1. In this example, using molybdenum disulfide solid powder, for a typical arsenic-containing Carlin-type difficult-to-leach gold ore, the gold leaching rate is 70.4%, and the consumption of sodium thiosulfate is 16.5 kg / t.

[0050] Example 2

[0051] The method for leaching gold with thiosulfate catalyzed by a solid catalyst comprises the following steps:

[0052] (1) Grinding the gold ore (No. 2 gold ore raw material) to a particle size of -18 μm accounting for 95%, and slurrying to a gold ore slurry with a concentration of 15 wt%;

[0053] (2) Molybdenum disulfide solid powder and thiosulfate (sodium thiosulfate pentahydrate) were added to the gold ore slurry to a concentration of 0.006 mol / L and 0.30 mol / L respectively; after adjusting the pH to 10.5 with sodium hydroxide, the gold was leached for 10 h at a stirring rate of 400 r / min and a slurry temperature of 18°C ​​under natural light indoors, and the gold leaching solution was filtered out. The filtered molybdenum disulfide was washed and reused.

[0054] The results of gold leaching in this embodiment are shown in Table 1. In this embodiment, molybdenum disulfide solid powder is used for typical oxidized gold ore, the gold leaching rate is 90.1%, and the consumption of sodium thiosulfate is 23.5 kg / t.

[0055] Example 3

[0056] The method for leaching gold with thiosulfate catalyzed by a solid catalyst comprises the following steps:

[0057] (1) Grinding the gold ore (No. 1 gold ore raw material) to a particle size of -18 μm accounting for 95%, and slurrying to a gold ore slurry with a concentration of 15 wt%;

[0058] (2) Adding molybdenum disulfide nanosuspension (concentration of 3 mg / mL) and thiosulfate (sodium thiosulfate pentahydrate) to the gold ore slurry to the concentrations of 0.006 mol / L and 0.35 mol / L; adjusting the pH to 10.5 with sodium hydroxide, and then leaching gold for 10 h at a stirring rate of 450 r / min and a slurry temperature of 20°C under natural light indoors. Filter the gold leaching solution, and wash the filtered molybdenum disulfide for reuse.

[0059] The results of gold leaching in this example are shown in Table 1. In this example, using molybdenum disulfide solid powder, for a typical arsenic-containing Carlin-type difficult-to-leach gold ore, the gold leaching rate is 73.2%, and the consumption of sodium thiosulfate is 17.1 kg / t.

[0060] Example 4

[0061] The method for leaching gold with thiosulfate catalyzed by a solid catalyst comprises the following steps:

[0062] (1) Grinding the gold ore (No. 1 gold ore raw material) to a particle size of -18 μm accounting for 95%, and slurrying to a gold ore slurry with a concentration of 15 wt%;

[0063] (2) Apply molybdenum disulfide ink to the container wall, add gold ore slurry and then add thiosulfate (sodium thiosulfate pentahydrate); the concentrations of molybdenum disulfide and thiosulfate are 0.006 mol / L and 0.35 mol / L, respectively. After adjusting the pH to 10.5 with sodium hydroxide, the mixture is stirred at a rate of 450 r / min and the slurry temperature is 20°C. The gold leaching solution is filtered and the molybdenum disulfide ink applied to the container wall is washed and reused.

[0064] The results of gold leaching in this example are shown in Table 1. In this example, using molybdenum disulfide solid powder, for a typical arsenic-containing Carlin-type difficult-to-leach gold ore, the gold leaching rate is 68.4%, and the consumption of sodium thiosulfate is 12.5 kg / t.

[0065] Example 5

[0066] The method for leaching gold with thiosulfate catalyzed by a solid catalyst comprises the following steps:

[0067] (1) Grinding the gold ore (No. 1 gold ore raw material) to a particle size of -18 μm accounting for 95%, and slurrying to a gold ore slurry with a concentration of 15 wt%;

[0068] (2) Molybdenum disulfide solid powder and thiosulfate (sodium thiosulfate pentahydrate) were added to the gold ore slurry to a concentration of 0.006 mol / L and 0.35 mol / L respectively; after adjusting the pH to 10.5 with sodium hydroxide, the gold was leached for 10 h at a stirring rate of 450 r / min and a slurry temperature of 20°C under natural light indoors, and the gold leaching solution was filtered out. The filtered molybdenum disulfide was washed and reused.

[0069] The results of gold leaching in this example are shown in Table 1. In this example, using molybdenum disulfide solid powder, for a typical arsenic-containing Carlin-type difficult-to-leach gold ore, the gold leaching rate is 69.8%, and the consumption of sodium thiosulfate is 18.5 kg / t.

[0070] Example 6

[0071] The method for leaching gold with thiosulfate catalyzed by a solid catalyst comprises the following steps:

[0072] (1) Grinding the gold ore (No. 3 gold ore raw material) to a particle size of -18 μm accounting for 95%, and slurrying to a gold ore slurry with a concentration of 15 wt%;

[0073] (2) Molybdenum disulfide solid powder and thiosulfate (sodium thiosulfate pentahydrate) were added to the gold ore slurry to a concentration of 0.006 mol / L and 0.35 mol / L respectively; after adjusting the pH to 10.5 with sodium hydroxide, the gold was leached for 10 h at a stirring rate of 450 r / min and a slurry temperature of 20°C under natural light indoors, and the gold leaching solution was filtered out. The filtered molybdenum disulfide was washed and reused.

[0074] The results of gold leaching in this example are shown in Table 1. In this example, molybdenum disulfide solid powder is used for typical high-copper difficult-to-leach gold ore, the gold leaching rate is 75.1%, and the consumption of sodium thiosulfate is 38.5 kg / t.

[0075] Comparative Example 1

[0076] The processing steps and parameters of this comparative example are exactly the same as those of Example 1, except that no catalyst is added to this comparative example. The gold leaching results are shown in Table 1.

[0077] Comparative Example 2

[0078] The processing steps and parameters of this comparative example 2 are exactly the same as those of Example 2, except that no catalyst is added to this comparative example. The gold leaching results are shown in Table 1.

[0079] Comparative Example 3

[0080] The processing steps and parameters of this comparative example are exactly the same as those of Example 1, except that the catalysts added in this comparative example are ammonia water and copper sulfate pentahydrate, and the concentrations of ammonia water and copper sulfate pentahydrate are 0.10 mol / L and 0.075 mol / L, respectively. The results of gold leaching are shown in Table 1.

[0081] Comparative Example 4

[0082] The processing steps and parameters of this comparative example are exactly the same as those of Example 2, except that the catalysts added in this comparative example are ammonia water and copper sulfate pentahydrate, and the concentrations of ammonia water and copper sulfate pentahydrate are 0.10 mol / L and 0.075 mol / L, respectively. The results of gold leaching are shown in Table 1.

[0083] Comparative Example 5

[0084] The processing steps and parameters of this comparative example 2 are exactly the same as those of Example 6, except that no catalyst is added in this comparative example. The gold leaching results are shown in Table 1.

[0085] Table 1 Gold immersion results

[0086]

[0087] As can be seen from Table 1, for arsenic-containing Carlin-type difficult-to-leach gold ore, the leaching rate reaches 73.2% by adding molybdenum disulfide nanosuspension as a catalyst. Compared with the gold leaching rate of only 38.6% in the absence of a catalyst, the gold leaching rate is increased by 34.6% by adding molybdenum disulfide nanosuspension in the present invention; compared with the gold leaching by thiosulfate with "ammonia water + copper sulfate pentahydrate" as a catalyst, the gold leaching rate in Comparative Example 3 is 68.9%, and the thiosulfate consumption is 60.2 kg / t. The present invention adds molybdenum disulfide nanosuspension as a catalyst, and the gold leaching rate reaches 73.2%, and the thiosulfate consumption is only 17.1 kg / t. The gold leaching rate of the present invention is increased by 4.3%, and the thiosulfate consumption is reduced by 71.6%.

[0088] At the same time, it can be seen from Table 1 that for oxidized gold ore, the gold leaching rate reached 90.1% by directly adding molybdenum disulfide solid powder catalyst, but the thiosulfate consumption was only 23.5 kg / t; compared with the case without adding any catalyst, the gold leaching rate in Comparative Example 2 was only 51.2%, and the thiosulfate consumption was 58.1 kg / t, the gold leaching rate of the present invention was increased by 38.9%, and the thiosulfate consumption was reduced by 59.6%; compared with the gold leaching by thiosulfate with the addition of catalyst "ammonia water + copper sulfate pentahydrate", the gold leaching rate in Comparative Example 4 was 78.9%, and the thiosulfate consumption was 43.5 kg / t, the gold leaching rate of the present invention was increased by 11.2%, and the thiosulfate consumption was reduced by 46%.

[0089] Therefore, the present invention adopts solid catalyst molybdenum disulfide to catalyze thiosulfate gold leaching, which improves the gold leaching rate and reduces a large amount of thiosulfate consumption at the same time. No side reaction is generated during the catalytic process and the subsequent gold leaching solution treatment steps will not be affected.

[0090] The specific implementation modes of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above implementation modes, and various changes can be made within the knowledge scope of ordinary technicians in this field without departing from the purpose of the present invention.

Claims

1. A method for leaching gold with thiosulfate catalyzed by a solid catalyst, characterized in that the steps include: (1) Grinding the gold ore and adjusting the slurry to a gold ore slurry with a concentration of 10-40wt%; (2) adding molybdenum disulfide solid powder or molybdenum disulfide nano suspension to the gold ore slurry, then adding thiosulfate, adjusting the pH to 9-12, leaching gold under light conditions, filtering to obtain a gold leaching solution, and washing the filtered molybdenum disulfide for reuse; Alternatively, molybdenum disulfide ink is applied to the container wall, gold ore slurry is added, and then thiosulfate is added. After adjusting the pH to 9-12, gold is leached under light conditions, and the gold leaching liquid is filtered to obtain the molybdenum disulfide ink applied to the container wall and then reused after washing.

2. The method for leaching gold with thiosulfate using a solid catalyst according to claim 1, characterized in that: In step (2), the thiosulfate is sodium thiosulfate, potassium thiosulfate or ammonium thiosulfate, and the initial concentration of the thiosulfate in the gold ore pulp is 0.01-1 mol / L.

3. The method for leaching gold with thiosulfate using a solid catalyst according to claim 1, characterized in that: In the step (2), the molybdenum disulfide solid powder has a purity of 98-99.98%, and the particle size of -8 μm accounts for more than 90%.

4. The method for leaching gold with thiosulfate using a solid catalyst according to claim 1, characterized in that: The concentration of the molybdenum disulfide nanosuspension in step (2) is 1-5 mg / mL.

5. The method for leaching gold with thiosulfate using a solid catalyst according to claim 1, characterized in that: The density of the molybdenum disulfide ink in step (2) is 0.58-0.98 g / mL.

6. The method for leaching gold with thiosulfate catalyzed by a solid catalyst according to any one of claims 3 to 5, characterized in that: In the step (2), the concentration of molybdenum disulfide in the gold ore slurry is 0.0001-1 mol / L.

7. The method for leaching gold with thiosulfate using a solid catalyst according to claim 1, characterized in that: In step (2), the gold leaching is carried out in an air atmosphere at a temperature of 0-40° C., a stirring rate of 100-500 r / min, and a leaching time of 4-12 hours.

8. The method for leaching gold with thiosulfate using a solid catalyst according to claim 1, characterized in that: In the step (2), the illumination conditions are indoor natural light, outdoor natural light, 100-800W high pressure mercury lamp or 100-800W xenon lamp, and the wavelength of the illumination conditions is 150-1500nm.

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