Immersion agents and processes for extracting gold from acidic gold-bearing materials

Abstract

This invention provides a gold leaching agent and process for extracting gold from acidic gold-containing materials. The gold leaching agent includes copper bromate, tribromoacetyl chloride, tartaric acid, organic acid salts, and organic amines. When this gold leaching agent is applied, the halogens in copper bromate and tribromoacetyl chloride first form stable complexes with gold ions. Tartaric acid improves the stability of the complexes, facilitating gold leaching. Copper in copper bromate also acts as an oxidizing agent for gold, promoting the formation of stable complexes with halogens. Organic amines act as stabilizers for copper, forming a copper-ammonia leaching effect, maintaining a good gold leaching rate. This invention's gold leaching agent, through the synergistic leaching effect of its components, can directly extract gold from acidic gold-containing materials without acid-base conversion, and also exhibits excellent leaching and recovery rates. It solves the problems of difficult acid-base conversion and high cost of solid waste cyanide tailings treatment in the cyanide gold extraction process of acidic gold-containing materials. Furthermore, it requires low reagent dosage, has a simple, environmentally friendly, and efficient process, and shows promising prospects for industrial application.

Description

Technical Field

[0001] This invention relates to the field of gold extraction technology, and in particular to a gold extraction agent and process for extracting gold from acidic gold-containing materials. Background Technology

[0002] Currently, in the metallurgical industry, pretreatment is necessary to better utilize refractory ores. Most pretreatment processes produce acidic slag. For this material, the current industrial practice primarily involves acid-base conversion followed by cyanide extraction. However, the cyanide tailings and liquids produced during cyanide extraction retain residual cyanide, requiring environmental treatment before discharge, increasing production costs. The industry urgently needs non-cyanide gold extraction technologies that can directly leach gold under acidic conditions, thereby reducing environmental pressure and production costs.

[0003] Currently, various non-cyanide gold leaching methods mainly include the thiosulfate method, halogen method, thiourea method, glycine method, and lime-sulfur mixture method. For example, an invention patent (application number CN 201610266915.6) discloses an environmentally friendly gold leaching agent and its preparation method. This gold leaching agent is composed of 8-15 parts of strong alkali (NaOH, KOH), 4-16 parts of carbonate (Na2CO3, NaHCO3, K2CO3), 12-30 parts of sodium cyanate, 3-6 parts of sodium chloride, 2-8 parts of sodium bromide, 6-22 parts of iron salt (ferrous chloride, ferrous nitrate, ferrous sulfate, potassium ferrocyanide), 2-4 parts of oxidant, and 3-6 parts of stabilizer (lead nitrate). This gold leaching agent can replace cyanide for gold extraction, is non-toxic and harmless, and the synthesis process is simple, with low waste gas emissions and no impact on the environment. However, this leaching agent requires acid-base conversion during application, which does not solve the problem of acid-base conversion required for acidic gold-containing materials during leaching in existing technologies. It requires a certain amount of time and reagent costs, increasing the cost of industrial leaching.

[0004] An invention patent (application number CN 201310069414.5) discloses an environmentally friendly multi-metal integrated recovery process for refractory gold and silver ores. The process involves pretreating refractory gold and silver concentrate powder with sodium sulfite under a slightly oxygen-enriched atmosphere and heating, followed by leaching in a sulfuric acid solution. The acid leaching residue is then leached into a sodium chloride solution in a specific ratio, with an organic chlorinating agent added according to the weight of the roasted ore. After stirring and leaching, the mixture is filtered and washed to form a precious liquor and filter residue. The filter residue is then fed into a tailings pond. The precious liquor is mixed with a chelating resin and agitated with airflow to form a gold- and silver-loaded resin. The pH of the lean liquor is adjusted, and solid sodium sulfate is added. The filter residue is then used to produce lead products. This process shortens the oxidation time, increases production capacity, lowers the roasting temperature, and reduces flue gas emissions. However, the treatment process for the acid leaching residue is relatively cumbersome, and the recovery process still requires a large amount of chemical reagents, easily generating waste residue and waste liquid, which can easily cause secondary pollution.

[0005] In view of this, it is necessary to design an improved gold extraction agent and process for extracting gold from acidic gold-containing materials in order to solve the above problems. Summary of the Invention

[0006] The purpose of this invention is to provide a gold leaching agent and process for extracting gold from acidic gold-containing materials. By designing the components of the gold leaching agent and utilizing the synergistic effect of each component, gold can be directly leached from acidic gold-containing materials, thereby solving the problems in the industry such as the difficulty in applying acidic gold-containing materials, the difficulty in acid-base conversion of acidic materials, cumbersome processes, and high costs.

[0007] To achieve the above-mentioned objective, the present invention provides a gold extraction agent for extracting gold from acidic gold-containing materials. The gold extraction agent comprises, by mass parts, 25-30 parts of copper bromate, 5-8 parts of tribromoacetyl chloride, 10-15 parts of tartaric acid, and an activator and a stabilizer.

[0008] As a further improvement of the present invention, the activator is an organic acid salt and the stabilizer is an organic amine.

[0009] As a further improvement of the present invention, in the gold immersion agent system, the organic acid salt is 0.8 to 1.0 parts by mass, and the organic amine is 3 to 5 parts by mass.

[0010] As a further improvement of the present invention, the immersion gold agent is used in an environment with a pH value between 1.0 and 5.0.

[0011] As a further improvement of the present invention, the organic acid salt includes one or both of sodium 3-nitrobenzenesulfonate and sodium 3-nitrobenzene sulfate.

[0012] As a further improvement of the present invention, the organic amine is one or both of diethylenetriamine and triethylenetetramine.

[0013] A process for extracting gold from acidic gold-bearing materials, wherein the gold extraction is performed using any of the above-mentioned gold extraction agents for extracting gold from acidic gold-bearing materials.

[0014] As a further improvement of the present invention, the process for extracting gold from acidic gold-containing materials includes the following steps:

[0015] S1. Crush the acidic gold-bearing material until the ore powder with a particle size of -0.074mm accounts for 75% to 85% of the total mass of the material, and add water to adjust the slurry to a mass percentage concentration of 30% to 35%.

[0016] S2. Add the gold leaching agent composed of copper bromate, tribromoacetyl chloride, tartaric acid, organic acid salts and organic amines to the slurry prepared in step S1, and stir and leach for 3-5 hours at room temperature and pressure to obtain gold-containing precious solution and gold leaching tailings.

[0017] S3. The gold in the gold-containing precious liquid obtained in step S2 is adsorbed and recovered by using D72 resin modified by electron beam radiation, thus completing the process of extracting gold from acidic gold-containing materials.

[0018] As a further improvement of the present invention, in step S2, the amount of gold leaching agent added is 43.8 to 59 g per liter of slurry; in step S3, the concentration of D72 resin in the gold-containing solution is 20 to 30 ml / L.

[0019] As a further improvement of the present invention, in step S1, the acidic gold-bearing material includes one or more of the following: bio-oxidation slag, bio-oxidation heap leaching slag, sulfuric acid slag, roasted sand, and flotation gold concentrate; in step S2, after adding the gold leaching agent, the pH value of the slurry is adjusted with phosphoric acid to maintain it at 1.0 to 5.0.

[0020] The beneficial effects of this invention are:

[0021] 1. This invention provides a gold leaching agent and process for extracting gold from acidic gold-bearing materials. The gold leaching agent comprises copper bromate, tribromoacetyl chloride, tartaric acid, and organic acid salt activators and organic amine stabilizers. This gold leaching agent is a reagent system primarily composed of organic reagents. Through the synergistic leaching effect of its components, gold can be directly extracted from acidic materials. When applied to the leaching process, this gold leaching agent eliminates the need for acid-base conversion, solving the problems of difficult acid-base conversion and high cost of solid waste cyanide tailings treatment in the cyanide gold extraction process for acidic gold-bearing materials such as acidic oxidation slag after bio-oxidation of gold concentrate and bio-heap leaching slag after bio-heap leaching of low-grade gold ore. Furthermore, while exhibiting superior leaching and recovery rates compared to cyanide leaching, this gold leaching agent significantly reduces production and environmental treatment costs, demonstrating broad application prospects.

[0022] 2. In the gold leaching agent of this invention, the halogens in copper bromate and tribromoacetyl chloride are chemically highly reactive and can first form stable complexes with gold ions. Tartaric acid also has a chelating effect on gold ions, synergistically improving the stability of the gold ion complexes and facilitating gold leaching. In addition, copper in copper bromate can also act as an oxidant for gold, oxidizing the gold in the ore into the liquid solution and promoting the formation of stable complexes with halogens. Organic amines act as stabilizers for copper, keeping the gold leaching system stable and thus maintaining a good gold leaching rate. Thus, when using the gold leaching agent of this invention to extract gold from acidic gold-containing materials, two gold leaching systems are formed: halogen complexation with gold ions and copper-ammonia leaching. This allows for direct gold extraction from acidic gold-containing materials without acid-base conversion. Under normal temperature and pressure leaching conditions, it exhibits excellent leaching and recovery rates, low reagent dosage, and a simple, environmentally friendly, efficient, and low-cost metal recovery process that is easy to industrialize.

[0023] 3. This invention provides a new and more stable gold leaching agent system and gold extraction process. Compared with the traditional gold leaching process, it solves the problem of acid-base transformation of acidic gold-containing materials from a new perspective, achieving the effect of low agent dosage and good leaching index of acidic gold-containing materials. Moreover, the gold leaching agent has good adaptability to materials and has good leaching of both acidic and conventional materials, with high leaching rate and recovery rate, realizing non-toxic and efficient leaching of gold from various materials. Attached Figure Description

[0024] Figure 1 This is a process flow diagram of gold extraction from acidic gold-containing materials according to Embodiment 1 of the present invention. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] It should also be noted that, in order to avoid obscuring the present invention with unnecessary details, only the structures and / or processing steps closely related to the present invention are shown in the accompanying drawings, while other details that are not closely related to the present invention are omitted.

[0027] Additionally, it should be noted that the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0028] A gold leaching agent for extracting gold from acidic gold-bearing materials comprises, by mass parts: 25-30 parts copper bromate, 5-8 parts tribromoacetyl chloride, 10-15 parts tartaric acid, and 0.8-1.0 parts activator and 3-5 parts stabilizer; the activator is an organic acid salt, and the stabilizer is an organic amine. This gold leaching agent is a reagent system mainly composed of organic reagents. Through the synergistic leaching effect of each component, gold can be directly extracted from acidic materials. When applied to the leaching process, this gold leaching agent eliminates the need for acid-base conversion, solving the problems of difficult acid-base conversion and high cost of solid waste cyanide tailings treatment in the cyanide gold extraction process for acidic gold-bearing materials such as acidic oxidation slag after bio-oxidation of gold concentrate and bio-heap leaching slag after bio-heap leaching of low-grade gold ore. Furthermore, while exhibiting superior leaching and recovery rates compared to cyanide leaching, this gold leaching agent significantly reduces production and environmental treatment costs, demonstrating broad application prospects.

[0029] It should be noted that the leaching agent of this invention is used in an environment with a pH value between 1.0 and 5.0. During gold leaching, the halogens in copper bromate and tribromoacetyl chloride are chemically very reactive and can first form stable complexes with gold ions. Tartaric acid also has a chelating effect on gold ions, synergistically improving the stability of the gold ion complexes and facilitating gold leaching. Furthermore, the copper in copper bromate can also act as an oxidizing agent for gold, oxidizing the gold in the ore into the liquid solution and promoting the formation of stable complexes with halogens. Organic amines act as stabilizers for copper, keeping the leaching system stable and thus maintaining a good gold leaching rate. Thus, when using the leaching agent of this invention to extract gold from acidic gold-containing materials, two leaching systems are formed: the complexation of halogen elements with gold ions and the copper-ammonia leaching effect. This allows for direct gold extraction from acidic gold-containing materials without the need for acid-base conversion. Under normal temperature and pressure leaching conditions, it exhibits excellent leaching and recovery rates, and requires low reagent dosage. The entire metal recovery process is simple, environmentally friendly, efficient, low-cost, and easy to industrialize.

[0030] In some specific embodiments, the organic acid salts include one or two of sodium 3-nitrobenzenesulfonate and sodium 3-nitrobenzene sulfate. The organic acid salts act as activators to promote the complexation of halogen elements with gold ions. The organic amines include one or two of diethylenetriamine and triethylenetetramine. The organic amines act as stabilizers to improve the stability of copper, enabling copper to better oxidize the gold in the ore, thereby acting as leaching aids.

[0031] A process for extracting gold from acidic gold-containing materials, using the aforementioned gold extraction agent for extracting gold from acidic gold-containing materials, specifically includes the following steps:

[0032] S1. Crush the acidic gold-bearing material until the ore powder with a particle size of -0.074mm accounts for 75% to 85% of the total mass of the material, and add water to adjust the slurry to a mass percentage concentration of 30% to 35%.

[0033] S2. Add a gold leaching agent composed of copper bromate, tribromoacetyl chloride, tartaric acid, organic acid salts and organic amines to the slurry prepared in step S1. Stir and leach for 3-5 hours at room temperature and pressure to obtain gold-containing precious solution and gold leaching tailings.

[0034] S3. The gold in the gold-containing precious liquid obtained in step S2 is adsorbed and recovered by using D72 resin modified by electron beam radiation, thus completing the process of extracting gold from acidic gold-containing materials.

[0035] Specifically, in step S2, the amount of gold leaching agent added is 43.8–59 g per liter of slurry; in step S3, the concentration of D72 resin in the gold-containing precious solution is 20–30 ml / L. It should be noted that D72 resin is a macroporous, strongly acidic styrene-based cation exchange resin. After electron beam radiation modification, the atoms and molecules in the material undergo ionization and fragmentation reactions, thereby altering the adsorption performance and adsorption capacity of D72 resin, making it more effective at adsorbing gold from acidic gold-containing precious solutions.

[0036] In step S1, the acidic gold-bearing material includes one or more of the following: bio-oxidation slag, bio-oxidation heap leaching slag, sulfuric acid slag, roasted sand, and flotation gold concentrate; in step S2, after adding the gold leaching agent, the pH value of the slurry is adjusted with phosphoric acid to maintain it at 1.0 to 5.0.

[0037] In practical applications, the gold extraction process using this leaching agent, compared with the traditional leaching process, solves the problem of acid-base transformation of acidic materials from a new perspective, achieving the technical effect of low reagent dosage and good leaching index of acidic gold-bearing materials. Moreover, this leaching agent has good adaptability to materials. It can not only have a good leaching effect on acidic gold-bearing materials, but also be applied to conventional gold-bearing materials. Only the pH value of the slurry needs to be adjusted with phosphoric acid to achieve efficient leaching of gold from conventional materials, thus realizing non-toxic and efficient leaching of gold from a variety of materials.

[0038] Example 1

[0039] Please see Figure 1 As shown, this embodiment 1 provides a gold extraction agent and process for extracting gold from acidic gold-containing materials. The process specifically includes the following steps:

[0040] S1. Preparation of slurry: Take 500g of acidic gold-bearing material, add water and ball mill for 25min, crush the ore to the point that the ore powder with a particle size of -0.074mm accounts for 80% of the total mass of the material, pour the ball-milled ore powder into the mixing tank, and add water under mechanical stirring to adjust the slurry concentration to 30%.

[0041] The acidic gold-bearing material used in the experiment was a bio-oxidation slag from a company in Liaoning Province. The multi-element content of the ore is shown in Table 1 below:

[0042] Table 1 Multi-element analysis of bio-oxidation residue

[0043] Element Au* Ag* S As Fe Cu Ca Pb Zn content(%) 35.15 1.22 2.25 3.11 9.40 0.15 2.50 0.19 1.35

[0044] Note: *Unit is g / t;

[0045] S2. Gold Leaching: Under mechanical stirring, a gold leaching agent consisting of copper bromate, tribromoacetyl chloride, tartaric acid, organic acid salts, and organic amines is added sequentially to a stirred tank containing ore slurry. The leaching is carried out at room temperature and pressure for 5 hours to obtain a gold-bearing solution and gold-leaching tailings. The concentrations of copper bromate in the ore slurry are as follows: 30 g / L, tribromoacetyl chloride: 5 g / L, tartaric acid: 10 g / L, sodium 3-nitrobenzene sulfate: 0.8 g / L, and triethylenetetramine: 3 g / L.

[0046] S3. Gold recovery: The gold in the gold-containing precious liquid obtained in step S2 is adsorbed and recovered using D72 resin (resin concentration of 30 ml / L) modified by electron beam radiation, thus completing the process of gold extraction from acidic gold-containing materials.

[0047] Example 2

[0048] Example 2 provides a gold leaching agent and process for extracting gold from acidic gold-bearing materials. The difference from Example 1 is that the gold-bearing material used is a flotation gold concentrate from Qianxinan Prefecture, Guizhou Province, and its multi-element content is shown in Table 2 below.

[0049] Table 2 Multi-element analysis of a certain flotation gold concentrate

[0050] Element Au* Zn S As Fe Cu Ca C <![CDATA[SiO2]]> content(%) 25.25 2.52 0.30 1.15 12.50 1.19 3.50 0.39 36.91

[0051] Note: *Unit is g / t;

[0052] Furthermore, in step S2, after adding the gold leaching agent to the slurry, the pH value of the slurry is adjusted with phosphoric acid to maintain it between 1.0 and 5.0; the rest is roughly the same as in Example 1, and will not be repeated here.

[0053] Comparative Example 1

[0054] Comparative Example 1 provides an immersion agent and process for extracting gold from acidic gold-containing materials. The difference from Example 1 is that copper bromate is not added in step S2. The rest is roughly the same as Example 1 and will not be repeated here.

[0055] Comparative Example 2

[0056] Comparative Example 2 provides a gold leaching agent and process for extracting gold from acidic gold-containing materials. The difference from Example 1 is that tribromoacetyl chloride is not added in step S2. The rest is roughly the same as Example 1 and will not be described again here.

[0057] Comparative Example 3

[0058] Comparative Example 3 provides a gold leaching agent and process for extracting gold from acidic gold-containing materials. The difference from Example 1 is that tartaric acid is not added in step S2. The rest is roughly the same as Example 1 and will not be described again here.

[0059] Comparative Example 4

[0060] Comparative Example 4 provides a gold leaching agent and process for extracting gold from acidic gold-containing materials. The difference from Example 1 is that the organic acid salt sodium 3-nitrobenzene sulfate is not added in step S2. The rest is roughly the same as Example 1 and will not be described again here.

[0061] Comparative Example 5

[0062] Comparative Example 5 provides a gold extraction agent and process for extracting gold from acidic gold-containing materials. The difference from Example 1 is that the organic amine triethylenetetramine is not added in step S2. The rest is roughly the same as Example 1 and will not be repeated here.

[0063] The gold leaching and recovery indicators of Examples 1-2 and Comparative Examples 1-5 were tested, and the results are shown in the table below.

[0064] Table 3. Gold leaching and recovery indices for Examples 1-2 and Comparative Examples 1-5

[0065]

[0066]

[0067] As shown in Table 3, the leaching rate and recovery rate of gold in Examples 1-2 and Comparative Examples 1-5 indicate that each agent in the gold leaching agent components of this scheme plays an important role and is indispensable. When the agent components are complete and the dosage is reasonable, the agents cooperate with each other to carry out synergistic leaching, resulting in a better gold leaching effect and a relatively high gold leaching rate and recovery rate.

[0068] Example 3

[0069] Example 3 provides a gold leaching agent and process for extracting gold from acidic gold-bearing materials. Compared with Example 1, the difference is that in step S2, the concentration of copper bromate in the slurry is 25 g / L, the concentration of tribromoacetyl chloride is 8 g / L, the concentration of tartaric acid is 15 g / L, the concentration of sodium 3-nitrobenzene sulfate is 1.0 g / L, and the concentration of triethylenetetramine is 5 g / L; the rest is roughly the same as in the example, and will not be repeated here.

[0070] Comparative Example 6

[0071] Comparative Example 6 provides a gold leaching agent and process for extracting gold from acidic gold-bearing materials. The difference from Example 1 is that in step S2, the concentration of copper bromate in the slurry is 20 g / L. The rest is roughly the same as in Example 1 and will not be repeated here.

[0072] Comparative Example 7

[0073] Comparative Example 7 provides a gold leaching agent and process for extracting gold from acidic gold-bearing materials. The difference from Example 1 is that in step S2, the concentration of copper bromate in the slurry is 35 g / L. The rest is roughly the same as in Example 1 and will not be repeated here.

[0074] Comparative Example 8

[0075] Comparative Example 8 provides a gold leaching agent and process for extracting gold from acidic gold-containing materials. The difference from Example 1 is that in step S2, the concentration of tribromoacetyl chloride is 2 g / L. The rest is roughly the same as in Example 1 and will not be repeated here.

[0076] Comparative Example 9

[0077] Comparative Example 9 provides a gold leaching agent and process for extracting gold from acidic gold-containing materials. The difference from Example 1 is that in step S2, the concentration of tribromoacetyl chloride is 12 g / L. The rest is roughly the same as in Example 1 and will not be repeated here.

[0078] Comparative Example 10

[0079] Comparative Example 10 provides a gold extraction agent and process for extracting gold from acidic gold-containing materials. The difference from Example 1 is that in step S2, the concentration of tartaric acid is 8 g / L. The rest is roughly the same as in Example 1 and will not be repeated here.

[0080] Comparative Example 11

[0081] Comparative Example 11 provides a gold extraction agent and process for extracting gold from acidic gold-containing materials. The difference from Example 1 is that in step S2, the concentration of tartaric acid is 18 g / L. The rest is roughly the same as in Example 1 and will not be repeated here.

[0082] Comparative Example 12

[0083] Comparative Example 12 provides a gold extraction agent and process for extracting gold from acidic gold-containing materials. The difference from Example 1 is that in step S2, the concentration of the organic acid salt sodium 3-nitrobenzene sulfate is 0.5 g / L. The rest is roughly the same as in Example 1 and will not be repeated here.

[0084] Comparative Example 13

[0085] Comparative Example 13 provides a gold leaching agent and process for extracting gold from acidic gold-containing materials. The difference from Example 1 is that in step S2, the concentration of the organic acid salt sodium 3-nitrobenzene sulfate is 1.5 g / L. The rest is roughly the same as in Example 1 and will not be repeated here.

[0086] Comparative Example 14

[0087] Comparative Example 14 provides a gold extraction agent and process for extracting gold from acidic gold-containing materials. The difference from Example 1 is that in step S2, the concentration of triethylenetetramine is 1 g / L. The rest is roughly the same as in Example 1 and will not be repeated here.

[0088] Comparative Example 15

[0089] Comparative Example 15 provides a gold leaching agent and process for extracting gold from acidic gold-containing materials. The difference from Example 1 is that in step S2, the concentration of triethylenetetramine is 8 g / L. The rest is roughly the same as in Example 1 and will not be repeated here.

[0090] The gold leaching and recovery indicators of Examples 3 and Comparative Examples 6-15 were tested, and the results are shown in the table below.

[0091] Table 4. Gold leaching and recovery indices for Examples 3 and Comparative Examples 6-15

[0092] Gold leaching rate (%) Gold recovery rate (%) Example 3 93 91.2 Comparative Example 6 80 78.5 Comparative Example 7 93 91.2 Comparative Example 8 70 68.6 Comparative Example 9 93 91.3 Comparative Example 10 85 83.3 Comparative Example 11 93 91.2 Comparative Example 12 87 85.3 Comparative Example 13 93 91.2 Comparative Example 14 85 83.5 Comparative Example 15 93 91.5

[0093] As shown in Table 4, each reagent in the gold leaching agent of this invention has an optimal dosage range. Below this range, the gold leaching rate and recovery rate are low, and the leaching effect is poor. Outside this range, the leaching effect will not be significantly improved. Therefore, the optimal dosage of the reagent is determined by combining the leaching effect and production cost. The reagent components can exert the maximum gold leaching effect when they are within the optimal range. The various reagents interact with each other to carry out synergistic leaching, resulting in a better gold leaching effect, a relatively high gold leaching rate and recovery rate, and higher economic benefits.

[0094] In summary, this invention provides a gold leaching agent and process for extracting gold from acidic gold-bearing materials. The gold leaching agent comprises copper bromate, tribromoacetyl chloride, tartaric acid, an organic acid salt activator, and an organic amine stabilizer. This gold leaching agent is a reagent system primarily composed of organic reagents. Through the synergistic leaching effect of its components, gold can be directly extracted from acidic materials. When applied to the leaching process, the halogens in copper bromate and tribromoacetyl chloride are chemically active and can first form stable complexes with gold ions. Tartaric acid also has a chelating effect on gold ions, synergistically improving the stability of the gold ion complexes and facilitating gold leaching. Furthermore, the copper in copper bromate can also act as an oxidant for gold, oxidizing the gold in the ore into the liquid solution and promoting the formation of stable complexes with halogens. The organic amine acts as a copper stabilizer, keeping the gold leaching system stable and thus maintaining a good gold leaching rate. When using the leaching agent of this invention to extract gold from acidic gold-bearing materials, two leaching systems are formed: the complexation of halogen elements with gold ions and the copper-ammonia leaching effect. This allows for direct gold extraction from acidic gold-bearing materials without the need for acid-base conversion, and also exhibits excellent leaching and recovery rates. It solves the problems of difficult acid-base conversion and high cost of solid waste cyanide tailings treatment in the cyanide gold extraction process for acidic gold-bearing materials such as acidic oxidation slag after bio-oxidation of gold concentrate and bio-heap leaching slag after bio-heap leaching of low-grade gold ore. Furthermore, the agent dosage is low, and the entire metal recovery process is simple, environmentally friendly, efficient, and low-cost, making it easy to industrialize and possessing broad application prospects.

[0095] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. A gold extraction agent for extracting gold from acidic gold-containing materials, characterized in that, The gold immersion agent comprises, by weight, 25-30 parts of copper bromate, 5-8 parts of tribromoacetyl chloride, 10-15 parts of tartaric acid, and activators and stabilizers. The activator is an organic acid salt, and the stabilizer is an organic amine; In the gold immersion agent system, the organic acid salt is 0.8 to 1.0 parts by mass, the organic amine is 3 to 5 parts by mass, the organic acid salt is one or two of sodium 3-nitrobenzenesulfonate and sodium 3-nitrobenzene sulfate, and the organic amine is one or two of diethylenetriamine and triethylenetetramine. The immersion gold agent is used in an environment with a pH value between 1.0 and 5.

0.

2. A process for extracting gold from acidic gold-containing materials, characterized in that, The gold extraction process using the leaching agent for extracting gold from acidic gold-containing materials as described in claim 1 includes the following steps: S1. Crush the acidic gold-bearing material until the ore powder with a particle size of -0.074mm accounts for 75% to 85% of the total mass of the material, and add water to adjust the slurry to a mass percentage concentration of 30% to 35%. S2. Add the gold leaching agent composed of copper bromate, tribromoacetyl chloride, tartaric acid, organic acid salts and organic amines to the slurry prepared in step S1, and stir and leach for 3-5 hours at room temperature and pressure to obtain gold-containing precious solution and gold leaching tailings. S3. The gold in the gold-containing precious liquid obtained in step S2 is adsorbed and recovered by using D72 resin modified by electron beam radiation, thus completing the process of extracting gold from acidic gold-containing materials.

3. The process for extracting gold from acidic gold-containing materials according to claim 2, characterized in that, In step S2, the amount of gold leaching agent added is 43.8 to 59 g per liter of slurry; in step S3, the concentration of D72 resin in the gold-containing solution is 20 to 30 ml / L.

4. The process for extracting gold from acidic gold-containing materials according to claim 2, characterized in that, In step S1, the acidic gold-bearing material is either bio-oxidation slag or flotation gold concentrate; in step S2, after adding the gold leaching agent, the pH value of the slurry is adjusted with phosphoric acid to maintain it between 1.0 and 5.0.

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