Gold extraction device and gold extraction method based on thiosulfate leaching

Abstract

The invention discloses a gold extraction device and a gold extraction method based on thiosulfate leaching. The gold extraction device comprises a leaching unit, a filter pressing unit and an electrolysis unit. The leaching unit comprises an agent tank, a leaching tank and a protection gas tank, and the agent tank and the protection gas tank are both communicated with the leaching tank. The filter pressing unit comprises a filter press, and the filter press is communicated with the leaching tank; the electrolysis unit comprises a leachate collecting pool, an electrolytic bath and a recycled liquid collecting pool, the leachate collecting pool is communicated with the filter press and the electrolytic bath, the recycled liquid collecting pool is communicated with the electrolytic bath and the leaching tank, and the outer side of a cathode of the electrolytic bath is sprayed with a gold ion adsorption material and a conductive carbon material. According to the embodiment of the invention, the consumption of thiosulfate is reduced by carrying out inflation anti-oxidation design on the leaching unit. According to the device, an electro-adsorption reduction method is adopted in the electrolysis unit, so that the recovery process flow is simplified. According to the device, the gold ion adsorption material is sprayed on the cathode, so that the recovery efficiency and the recovery effect are improved.

Description

Technical Field

[0001] The invention relates to the technical field of precious metal recovery, and in particular to a gold extraction device and a gold extraction method based on thiosulfate leaching. Background Art

[0002] Since the cyanidation gold extraction method was proposed in the 18th century, it has been widely used in gold production, with the characteristics of low gold extraction cost and mature technology. However, the sodium cyanide used in the cyanidation gold extraction method is highly toxic. The cyanide-containing tailings produced by gold extraction currently pose a serious threat to the ecological environment around the mining area, and it is urgent to develop efficient cyanide-free gold extraction technology.

[0003] The thiosulfate method is one of the cyanide-free gold extraction technologies. It is green and environmentally friendly, has a fast gold leaching rate, and has good ore adaptability. It is the cyanide-free gold extraction technology with the most promising industrial application prospects. At present, this technology has not yet been applied industrially. The main technical bottleneck is that the gold coordination ions in the thiosulfate leachate are difficult to enrich and recover. This is because the concentration of gold coordination ions in the cyanide leachate is low and cannot be directly replaced and recovered by electrodeposition, so pre-enrichment is required. At present, the "carbon slurry method" is mainly used in cyanide gold extraction to extract Au (CN) in the leachate. 2- Adsorption enrichment, the specific process is: add activated carbon to cyanide slurry, adsorb the leached gold coordination ions to obtain gold-loaded carbon, then use cyanide-containing alkali solution to desorb the gold on the gold-loaded carbon to obtain precious liquid, and then use replacement method or electrodeposition to reduce and recover the gold in the precious liquid. Because the gold thiosulfate coordination ions are large in size and high in charge, activated carbon has poor adsorption on them, and the "carbon slurry method" is difficult to use for thiosulfate method to extract gold.

[0004] In summary, the existing gold ion recovery process lacks a gold extraction device for the thiosulfate method. Summary of the invention

[0005] The purpose of this application is to overcome the above-mentioned technical deficiencies, propose a gold extraction device and a gold extraction method based on thiosulfate leaching, and solve the technical problem of the lack of a gold extraction device for the thiosulfate method in the prior art.

[0006] In order to achieve the above technical objectives, this application adopts the following technical solutions: In a first aspect, the present application provides a gold extraction device based on thiosulfate leaching, comprising a leaching unit, a filter press unit and an electrolysis unit: A leaching unit, the leaching unit comprising a reagent tank, a leaching tank and a protective gas tank, the reagent tank and the protective gas tank being both connected to the leaching tank; A filter press unit, the filter press unit comprising a filter press, the filter press being connected to the leaching tank; and The electrolysis unit comprises a leachate collection pool, an electrolytic cell and a recovery liquid collection pool, wherein the leachate collection pool is respectively connected to the filter press and the electrolytic cell, and the recovery liquid collection pool is respectively connected to the electrolytic cell and the leaching tank, and the outer side of the cathode of the electrolytic cell is sprayed with gold ion adsorption material and conductive carbon material.

[0007] In some embodiments of the present application, the leaching unit further includes a reagent pump, which is respectively connected to the outlet of the reagent tank and the inlet of the leaching tank.

[0008] In some embodiments of the present application, the leaching unit also includes a slurry pump, the number of the leaching tanks is multiple, the multiple leaching tanks are arranged on different sides of the reagent tank and are all connected to the reagent tank and the filter press, and the slurry pump is connected to two adjacent leaching tanks.

[0009] In some embodiments of the present application, the leaching unit further includes a plurality of motors and a plurality of stirring paddles, each of the motors is drivingly connected to a stirring paddle, and each of the stirring paddles partially extends into the inner cavity of the medicine tank or the leaching tank.

[0010] In some embodiments of the present application, the filter press unit also includes a diaphragm pump and a hydraulic oil pump, the filter press is a plate filter press, the hydraulic oil pump abuts against at least one side of the filter plate of the filter press, and the diaphragm pump is respectively connected to the outlet of the leaching tank and the inlet of the filter press.

[0011] In some embodiments of the present application, the electrolysis unit also includes a leachate water pump and a recovery liquid water pump, the leachate water pump is respectively connected to the outlet of the leachate collection tank and the inlet of the electrolytic cell, and the recovery liquid water pump is respectively connected to the outlet of the electrolytic cell and the inlet of the recovery liquid collection tank.

[0012] In some embodiments of the present application, the electrolysis unit also includes an electrolytic water pump and a circulation pump. The number of the electrolytic cells is multiple, and the multiple electrolytic cells are arranged at intervals and connected in series in sequence. Each electrolytic water pump is connected to two adjacent electrolytic cells, and each circulation pump is connected to one electrolytic cell. The two electrolytic cells located at both ends are respectively connected to the leachate collection tank and the recovery liquid collection tank.

[0013] In some embodiments of the present application, the anode material of the electrolytic cell includes one of titanium, glassy carbon, silicon carbide, graphite electrode, and graphite felt, the cathode material is a titanium plate or a stainless steel plate, and the gold ion adsorption material includes a sulfide porous material with a conduction band value lower than -0.6V.

[0014] In a second aspect, the present application further provides a method for extracting gold based on thiosulfate leaching, using the gold extraction device based on thiosulfate leaching as described in any embodiment of the first aspect, comprising the following steps: Adding reagents and water into the reagent tank to form an extract; A protective gas is introduced into the leaching tank, and gold ore and the leaching solution are added to form a slurry; filtering the slurry in a filter press to form a filtrate; The filtrate is electrolyzed in an electrolytic cell to form gold element and a recovery solution.

[0015] In some embodiments of the present application, the gold extraction method further comprises: Mixing the gold ion adsorption material and the conductive carbon material uniformly; Adding a binder to the mixture and stirring evenly to obtain a paste-like slurry; Evenly spraying the slurry onto the outer side of the cathode of the electrolytic cell; The cathode is dried to remove the organic solvent, thereby obtaining a gold ion adsorption electrode.

[0016] Compared with the prior art, the technical solution provided by this application has the following beneficial technical effects: The embodiment of the present application adopts an aeration anti-oxidation design in the leaching unit, and avoids S2O3 by filling in protective gas. 2- The device adopts the electrosorption reduction method in the electrolysis unit. The cathode material converts Au(S2O3)2 3- After adsorption, it is reduced to gold under the action of electrons provided by the cathode, realizing the one-step conversion of Au(S2O3)2 3- Direct reduction enrichment to gold element simplifies Au(S2O3)2 3- Recycling process. This device sprays gold ion adsorption material on the cathode to enhance the Au(S2O3)2 3- Adsorbed on the electrode, a high concentration gradient is formed on the cathode surface and the bulk of the solution, making Au(S2O3)2 3- Faster diffusion to the cathode further improves the recovery efficiency and the trace amount of Au(S2O3)2 3- recycling effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solution in this application, the following is a brief introduction to the drawings required for use in the embodiments: Figure 1 It is a structural schematic diagram of a gold extraction device based on thiosulfate leaching provided in an embodiment of the present application; Figure 2It is a structural schematic diagram of a leaching unit provided in an embodiment of the present application; Figure 3 It is a structural schematic diagram of a filter press unit provided in an embodiment of the present application; Figure 4 It is a structural schematic diagram of an electrolysis unit provided in an embodiment of the present application; Figure 5 It is a schematic flow chart of a gold extraction method based on thiosulfate leaching provided in an embodiment of the present application.

[0018] Reference numerals: Leaching unit 1, filter press unit 2, electrolysis unit 3; Reagent tank 11, leaching tank 12, reagent pump 13, slurry pump 14, motor 15, stirring paddle 16; Filter press 21, diaphragm pump 22, hydraulic oil pump 23; Leachate collection tank 31 , electrolytic cell 32 , recovery liquid collection tank 33 , leachate water pump 34 , electrolytic water pump 35 , circulation pump 36 , recovery liquid water pump 37 . DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0020] Those skilled in the art will appreciate that in this specification, the wording "including" is an open-ended expression, which means that the described features exist but does not exclude other features. The directional words "up", "down", "left", "right", etc. are exemplary directions based on the drawings. Features defined as "first" and "second" implicitly include one or more of the features. Singular expressions can also be used in the plural. "Multiple" means two or more. The terms "installed", "connected", and "connected" can be fixed connections, detachable connections, or integrated connections; they can be directly connected, or indirectly connected through an intermediate medium, or they can be internal connections between two elements. In addition, "connected" can include wireless connections.

[0021] The purpose of this application is to overcome the above-mentioned technical deficiencies, propose a gold extraction device and a gold extraction method based on thiosulfate leaching, and solve the technical problem of the lack of a gold extraction device for the thiosulfate method in the prior art.

[0022] In order to achieve the above technical objectives, this application adopts the following technical solutions: In the first aspect, the present application provides a gold extraction device based on thiosulfate leaching, such as Figure 1 As shown, Figure 1It is a structural schematic diagram of a gold extraction device based on thiosulfate leaching provided in an embodiment of the present application.

[0023] A gold extraction device based on thiosulfate leaching includes a leaching unit 1, a filter press unit 2 and an electrolysis unit 3: A leaching unit 1, wherein the leaching unit 1 comprises a reagent tank 11, a leaching tank 12 and a protective gas tank, wherein the reagent tank 11 and the protective gas tank are both connected to the leaching tank 12; A filter press unit 2, wherein the filter press unit 2 comprises a filter press 21, and the filter press 21 is connected to the leaching tank 12; and The electrolytic unit 3 includes a leachate collection pool 31, an electrolytic cell 32 and a recovery liquid collection pool 33. The leachate collection pool 31 is connected to the filter press 21 and the electrolytic cell 32 respectively. The recovery liquid collection pool 33 is connected to the electrolytic cell 32 and the leaching tank 12 respectively. The outer side of the cathode of the electrolytic cell 32 is sprayed with gold ion adsorption material and conductive carbon material.

[0024] In the embodiment of the present application, an aeration anti-oxidation design is implemented in the leaching unit 1, and protective gas is introduced to avoid S2O3 2- The device adopts the electrosorption reduction method in the electrolysis unit 3, and the cathode material converts Au(S2O3)2 3 -After adsorption, it is reduced to gold under the action of electrons provided by the cathode, realizing the one-step conversion of Au(S2O3)2 3- Direct reduction enrichment to gold element simplifies Au(S2O3)2 3- Recycling process. This device sprays gold ion adsorption material on the cathode to enhance the Au(S2O3)2 3- Adsorbed on the electrode, a high concentration gradient is formed on the cathode surface and the bulk of the solution, making Au(S2O3)2 3- Faster diffusion to the cathode further improves the recovery efficiency and the trace amount of Au(S2O3)2 3- recycling effect.

[0025] The overall structure of the equipment is as follows Figure 1 As shown, the equipment is mainly divided into three parts: a leaching unit 1 for the front-end leaching solution configuration and gold ore leaching; a filter press unit 2 for solid-liquid separation of the leached slurry; and an electrolysis unit 3 for electrosorption reduction and gold extraction of the filtered leaching solution.

[0026] like Figure 2 As shown, Figure 21 is a schematic diagram of the structure of a leaching unit 1 provided in an embodiment of the present application. In some embodiments of the present application, the leaching unit 1 further includes a reagent pump 13, and the reagent pump 13 is connected to the outlet of the reagent tank 11 and the inlet of the leaching tank 12 respectively.

[0027] In some embodiments of the present application, the leaching unit 1 also includes a slurry pump 14, the number of the leaching tank 12 and the electrolytic cell 32 is multiple, the multiple leaching tanks 12 are arranged on different sides of the reagent tank 11 and are all connected to the reagent tank 11 and the filter press 21, and the slurry pump 14 is connected to two adjacent leaching tanks 12.

[0028] It is worth mentioning that when the leaching unit 1 includes multiple leaching tanks 12, the slurry pump 14 is not directly connected to the filter press 21, but one leaching tank 12 is directly connected to the diaphragm pump 22 of the filter press 21, and the slurry in the remaining leaching tanks 12 is sent to the above-mentioned leaching tank 12 and then indirectly connected to the filter press 21.

[0029] In some embodiments of the present application, the leaching unit 1 also includes multiple motors 15 and multiple stirring paddles 16, each of the electrodes is transmission-connected to one of the stirring paddles 16, and each of the stirring paddles 16 partially extends into the inner cavity of the medicine tank 11 or the leaching tank 12.

[0030] The structure of the leaching part of the equipment is as follows Figure 2 As shown, it includes a reagent tank 11, two leaching tanks 12, a reagent pump 13, a slurry pump 14, three motors 15 and stirring paddles 16 connected thereto.

[0031] The reagent tank 11 is used to prepare the leaching solution. After adding the reagent and water in sequence, turn on the motor 15 to stir and dissolve. The prepared leaching solution is added to the two leaching tanks 12 by the reagent pump 13, and then the gold ore is added to the leaching tank 12 and the motor 15 is turned on to stir and start leaching. During the leaching process, protective gas is introduced into the leaching tank 12 to reduce S2O3 2- After leaching, the slurry enters the filter press 21 through the diaphragm pump 22 for solid-liquid separation.

[0032] The reagent tank 11 is used for preparing the leaching solution. First, the reagent and water are added into the reagent tank 11 according to a certain ratio, and then the motor 15 is turned on to drive the stirring paddle 16 to stir, so as to ensure that the reagent is fully dissolved.

[0033] The prepared leaching solution is sent to two leaching tanks 12 through the reagent pump 13. After the gold ore is added to the leaching tank 12, the motor 15 is turned on again to stir and start the leaching process. During this process, protective gas (such as nitrogen or carbon dioxide) is introduced into the leaching tank 12 to reduce thiosulfate (S2O3 2- )) consumption.

[0034] By introducing protective gas into the leaching tank 12, the oxidation of thiosulfate is effectively prevented, thereby maintaining its stability in the solution and improving the leaching efficiency of gold. The design of multiple leaching tanks 12 can process more gold ores at the same time, thereby improving the leaching efficiency of the entire system. Since the oxidation of thiosulfate is reduced, the consumption of chemical agents is reduced, thereby reducing costs.

[0035] like Figure 3 As shown, Figure 3 It is a structural schematic diagram of a filter press unit 2 provided in an embodiment of the present application.

[0036] In some embodiments of the present application, the filter press unit 2 also includes a diaphragm pump 22 and a hydraulic oil pump 23, the filter press 21 is a plate filter press 21, the hydraulic oil pump 23 abuts against at least one side of the filter plate of the filter press 21, and the diaphragm pump 22 is respectively connected to the outlet of the leaching tank 12 and the inlet of the filter press 21.

[0037] The structure of the filter press part of the equipment is as follows Figure 3 As shown, the main body is a plate and frame filter press 21, and the auxiliary equipment includes a diaphragm pump 22 and a hydraulic oil pump 23. During filtration, the hydraulic oil pump 23 is turned on to press the filter plate, and then the diaphragm pump 22 is turned on to pump the slurry in the leaching tank 12 into the filter press 21, and the filtrate flows from the pipeline at the outlet of the filter press 21 to the leaching liquid collection tank 31. After the filtration is completed, the filter plate is loosened to remove the filter cake, and the filter plate is rinsed with clean water.

[0038] After leaching, the mixture containing the gold ore pulp is pumped into the filter press 21 for solid-liquid separation. The filter press 21 separates the solid waste from the gold-containing solution.

[0039] The filter press unit 2 is mainly composed of a plate filter press 21, a diaphragm pump 22 and a hydraulic oil pump 23. The plate filter press 21 has a series of filter plates and filter cloths inside for solid-liquid separation.

[0040] During the filtration process, the hydraulic oil pump 23 is first turned on to press the two sides of the filter plate tightly through the hydraulic system to ensure that the slurry does not leak during filtration.

[0041] After the diaphragm pump 22 is started, the slurry in the leaching tank 12 is pumped into the filter press 21. The slurry passes through the filter cloth under pressure, the solid particles (filter cake) are intercepted on the filter cloth, and the filtrate flows out through the filter cloth.

[0042] The filtrate flows through the pipeline at the outlet of the filter press 21 to the leachate collection tank 31 for the next step of treatment.

[0043] After the filtration is complete, the filter plates are loosened and the filter cake is removed. The filter cake can be further processed to recover the gold.

[0044] Rinse the filter plate with clean water to remove residual solid matter and prepare for the next filter press.

[0045] The plate filter press 21 can efficiently separate solids and liquids, and the filter cake has a low water content. Through the cooperation of the hydraulic oil pump 23 and the diaphragm pump 22, the filter pressing process has a high degree of automation and is easy to operate. The automated filter pressing process reduces manual operations and saves labor costs. Since the gold carried away by the water in the filter cake is reduced, it is beneficial to improve the recovery rate of gold in the gold mine.

[0046] like Figure 4 As shown, Figure 4 3 is a schematic diagram of the structure of an electrolysis unit 3 provided in an embodiment of the present application. In some embodiments of the present application, the electrolysis unit 3 further includes a leachate pump 34, an electrolysis pump 35, a circulation pump 36 and a recovery liquid pump 37, the leachate pump 34 is respectively connected to the outlet of the leachate collection tank 31 and the inlet of the electrolytic cell 32, and the recovery liquid pump 37 is respectively connected to the outlet of the electrolytic cell 32 and the inlet of the recovery liquid collection tank 33.

[0047] In some embodiments of the present application, there are multiple electrolytic cells 32, and the multiple electrolytic cells 32 are arranged at intervals and connected in series in sequence. Each electrolytic water pump 35 is connected to two adjacent electrolytic cells 32, and each circulating pump 36 is connected to one electrolytic cell 32. The two electrolytic cells 32 located at both ends are respectively connected to the leachate collection tank 31 and the recovery liquid collection tank 33.

[0048] The structure of the equipment recycling part is as follows Figure 4 As shown, it includes a water pump control box, a leachate collection tank 31, a recovery liquid collection tank 33, four electrolytic cells 32, water pumps for the leachate and recovery liquid collection tanks 33, a water pump for each electrolytic cell 32 and a circulation pump 36.

[0049] During recovery, the leachate in the leachate collection tank 31 is transported to the four electrolytic cells 32 by a water pump, and the plates in the electrolytic cells 32 are powered on and the circulation pump 36 is turned on to start recovery. The recovered liquid after electrosorption reduction is transported to the recovered liquid collection tank 33 by the electrolytic cell 32 water pump, and the metal deposited on the plates is washed down by water and collected through the pipes below the electrolytic cells 32.

[0050] The leachate pump 34 transports the leachate in the leachate collection tank 31 to the electrolytic cell 32 , and the electrolytic water pump 35 transports the leachate between the electrolytic cells 32 connected in series, from the previous electrolytic cell 32 to the next electrolytic cell 32 .

[0051] In the electrolytic cell 32, gold ions in the leaching solution are reduced and deposited on the cathode when electricity is supplied. The circulation pump 36 ensures that the solution in the electrolytic cell 32 flows evenly, thereby improving the electrolysis efficiency.

[0052] The recovered liquid after the electrosorption reduction is transported to the recovered liquid collection pool 33 by the water pump of the electrolytic cell 32, and then transported back to the leaching tank 12 for recycling.

[0053] During the electrolysis process, the elemental gold deposited on the electrode plates is washed down by the water flow and collected through the pipe below the electrolytic cell 32.

[0054] The electrolytic cell 32 is designed so that S2O3 2- The reduction and deposition efficiency is high, and gold can be effectively recovered from the leaching solution. Multiple electrolytic cells 32 are arranged at intervals and connected in series in sequence, which can achieve continuous operation and improve the overall recovery efficiency. Through the automatic control of the water pump and the circulating pump 36, the electrolysis process is easy to operate and manage.

[0055] In some embodiments of the present application, the electrodes of the electrolytic cell 32 include an anode and a cathode, the anode includes one of titanium, glassy carbon, silicon carbide, a graphite electrode, and graphite felt, the cathode is a titanium plate or a stainless steel plate, and the gold ion adsorption material includes a sulfide porous material with a conduction band value lower than -0.6V.

[0056] The sulfide porous material includes cadmium sulfide, zinc sulfide, molybdenum disulfide and the like.

[0057] The electrodes in the electrolytic cell 32 are divided into an anode and a cathode. The anode material can be selected from titanium, glassy carbon, silicon carbide, graphite electrode, graphite felt, etc. These materials have good electrochemical stability and conductivity and can work stably during the electrolysis process. The cathode is usually made of titanium plate or stainless steel plate, which has good conductivity and chemical stability and is suitable as a carrier for depositing precious metals such as gold.

[0058] During the electrolysis process, an oxidation reaction occurs at the anode and a reduction reaction occurs at the cathode. When the gold-containing leaching solution passes through the electrolytic cell 32, S2O3 2- The electrons obtained at the cathode are reduced to elemental gold and deposited on the cathode surface. The selection of anode materials can resist corrosion that may occur during the electrolysis process and maintain the stability and life of the electrode.

[0059] The selected anode materials such as titanium and graphite have high chemical stability and are not easily oxidized or corroded, thus ensuring the long-term stable operation of the electrolysis process.

[0060] Cathode materials such as stainless steel plates and titanium plates have excellent conductivity and can effectively conduct current and improve electrolysis efficiency.

[0061] Through carefully designed electrode materials, efficient deposition of gold ions on the cathode can be promoted, thereby improving the gold recovery rate.

[0062] In a second aspect, the present application also provides a method for extracting gold based on thiosulfate leaching, such as Figure 5 As shown, Figure 5 It is a schematic flow chart of a gold extraction method based on thiosulfate leaching provided in an embodiment of the present application.

[0063] A method for extracting gold based on thiosulfate leaching, using the gold extraction device based on thiosulfate leaching as described in any one embodiment of the first aspect, comprising the following steps: S1. Adding reagent and water to the reagent tank 11 to form an extract; S2. A protective gas is introduced into the leaching tank 12, and the gold ore and the leaching solution are added to form a slurry; S3. Filtering the slurry in the filter press 21 to form a filtrate; S4. The filtrate is electrolyzed in the electrolytic cell 32 to form gold element and a recovery liquid.

[0064] Reagent preparation (S1): Add thiosulfate and other reagents and water into the reagent tank 11, stir and dissolve to form a leaching solution. Thiosulfate, as a leaching agent, can react with gold in the gold ore to form a soluble gold complex.

[0065] Leaching process (S2): A protective gas (such as nitrogen or carbon dioxide) is introduced into the leaching tank 12 to prevent the thiosulfate from being oxidized, and gold ore and leaching solution are added to form a slurry. The use of protective gas helps to maintain the stability of the leaching solution and ensure the effective leaching of gold.

[0066] Solid-liquid separation (S3): The ore pulp is filtered through a filter press 21 to leach tailings (filter cake) and gold-containing leachate (filtrate). This step helps to remove insoluble matter and provide clear filtrate for the subsequent electrosorption reduction step.

[0067] Electrolytic recovery (S4): The filtrate is electrolyzed in the electrolytic cell 32, and the S2O3 in the filtrate is recovered by the current on the electrodes. 2- The electrolytic solution is reduced to gold and deposited on the cathode to form gold. At the same time, the recovered liquid produced during the electrolysis process can be further processed or recycled.

[0068] In some embodiments of the present application, the gold extraction method further comprises: Mixing the gold ion adsorption material and the conductive carbon material uniformly; Adding a binder to the mixture and stirring evenly to obtain a paste-like slurry; The slurry is evenly sprayed onto the outer side of the electrode of the electrolytic cell 32; The electrode is dried to remove the organic solvent, thereby obtaining a gold ion adsorption electrode.

[0069] Before recycling, it is necessary to prepare the gold-philic adsorption material electrode. First, the gold-philic adsorption material is mixed evenly with the conductive carbon black, and then a binder is added and stirred evenly to obtain a paste slurry. The obtained slurry is evenly sprayed onto the titanium plate with a spray gun, and then the plate is dried to remove the organic solvent, and the gold-philic adsorption material electrode for recycling can be obtained.

[0070] Material mixing: Mix the gold ion adsorption material with the conductive carbon material (such as conductive carbon black) to enhance the conductivity of the electrode and S2O3 2- adsorption capacity.

[0071] Adding binder: Add binder (such as polyvinylidene fluoride, polyacrylic acid, etc.) to the mixture and stir evenly to form a paste slurry. The function of the binder is to fix the adsorbent material and the conductive carbon material so that they are firmly attached to the electrode.

[0072] Spraying slurry: Use a spray gun to evenly spray the paste slurry onto the outside of the electrode, such as the titanium plate, of the electrolytic cell 32. Spraying can ensure uniform distribution of the material and improve the adsorption efficiency of the electrode.

[0073] Drying electrode: Dry the sprayed electrode to remove the organic solvent, solidify the binder, and form a stable gold ion adsorption electrode.

[0074] In order to explore the adaptability of this equipment to different minerals, sulfide gold ore and quartz gold ore were used respectively, and two groups of leaching and recovery were carried out under the same conditions. The leaching and recovery conditions are as follows. The leaching is carried out with a liquid-to-solid ratio of 4:1. 20 kg of gold ore is required and 80 L of leaching solution is prepared. First, add 80 L of water to the reagent tank 11, and then weigh the leaching agent according to the concentration of the agent, add it and stir to dissolve. When leaching, divide 80 L of leaching solution into two leaching tanks 12, and add 10 kg of gold ore (sulfide gold ore or quartz gold ore) to each of the two leaching tanks 12. Start the electrode and adjust the speed to 500 rpm for stirring and leaching. At the same time, start to fill the leaching tank 12 with protective gas at a rate of 2 m³ / h. After the leaching is completed, filter press to obtain the leachate. When recycling, first add the leachate to four electrolytic cells 32, Then put the gold-philic adsorption material electrode into it, connect the power supply to the plate and set the voltage to 1.2 V, turn on the power supply and the circulation pump 36 of the electrolytic cell 32 to start recovery. At the end of leaching and recovery, take a sample from the corresponding solution, filter out the insoluble solids with a filter head, and use atomic absorption spectroscopy to test the gold concentration in the solution, and calculate the leaching rate and recovery rate of gold. As shown in Table 1, the leaching rate and recovery rate of the device for different gold mines are high, and it has good adaptability to gold mines.

[0075] Table 1 Leaching rate and recovery rate of sulfide gold ore and quartz gold ore

[0076] In order to explore the influence of the power supply voltage on the gold recovery effect of the device, the power supply voltage was set to 0.6 and 1.2 V respectively, and two groups of leaching and recovery were carried out under the same other conditions. The leaching and recovery conditions are as follows. The leaching is carried out with a liquid-to-solid ratio of 4:1, and 20 kg of gold ore is required to prepare 80 L of leaching solution. First, add 80 L of water to the reagent tank 11, and then weigh the leaching agent according to the concentration of the agent, add it and stir to dissolve. During leaching, 80 L of leaching solution is evenly added to two leaching tanks 12, and 10 kg of sulfide gold ore is added to both leaching tanks 12. The electrode is started and the speed is adjusted to 500 rpm for stirring and leaching. At the same time, protective gas is filled into the leaching tank 12 at a rate of 2 m³ / h. After the leaching is completed, the leachate is obtained by filter pressing. When recycling, the leaching solution is first added to four electrolytic cells 32, and then the gold-philic adsorption material electrode is placed therein, the power supply is connected to the electrode plate to set the voltage (0.6 V or 1.2 V), and the power supply and the circulation pump 36 of the electrolytic cell 32 are turned on to start recycling. At the end of leaching and recycling, samples are taken from the corresponding solution, and the insoluble solids are filtered out with a filter head. The gold concentration in the solution is obtained by atomic absorption spectroscopy, and the leaching rate and recovery rate of gold are calculated. As shown in Table 2, the gold recovery rate of 0.6 V voltage and 1.2 V voltage is similar, reaching more than 98%. The device can recover gold at a lower voltage.

[0077] Table 2 Leaching rate and recovery rate of sulfide gold ore and quartz gold ore

[0078] In order to explore the effect of filling protective gas during leaching on thiosulfate consumption and gold leaching recovery, two groups of leaching and recovery were carried out with and without protective gas, respectively. The leaching and recovery conditions are as follows. The leaching is carried out with a liquid-solid ratio of 4:1, and 20 kg of gold ore is required to prepare 80 L of leaching solution. First, add 80 L of water to the reagent tank 11, and then weigh the leaching agent according to the concentration of the agent, add it and stir to dissolve. During leaching, 80 L of leaching solution is evenly added to two leaching tanks 12, and 10 kg of sulfide gold ore is added to both leaching tanks 12. The electrode is started and the speed is adjusted to 500 rpm for stirring leaching. At the same time, protective gas is started into the leaching tank 12 at a rate of (0 m³ / h or 2 m³ / h). After the leaching is completed, the leaching solution is obtained by filter pressing. When recycling, first add the leaching solution to four electrolytic cells 32, then put the gold-philic adsorption material electrodes therein, set the voltage between the power supply and the plate to 1.2 V, turn on the power supply and the circulation pump 36 of the electrolytic cell 32 to start recycling. At the end of leaching and recycling, take a sample from the corresponding solution, filter out the insoluble solids with a filter head, and use atomic absorption spectroscopy to test the gold concentration in the solution, and calculate the leaching rate and recovery rate of gold. As shown in Table 3, the consumption of ammonium thiosulfate in leaching without protective gas is much higher than that in the case of protective gas, and because S2O3 2- Large consumption of gold also reduces the leaching rate.

[0079] Table 3 Leaching rate and recovery rate of sulfide gold ore and quartz gold ore

[0080] (1) The device is designed with aeration and anti-oxidation in the leaching part, and the S2O3 2- It is oxidized in large quantities, which reduces the consumption of thiosulfate while ensuring stable and rapid leaching of gold from the gold mine.

[0081] (2) The device adopts the electro-adsorption reduction method in the recovery part. The cathode material converts Au(S2O3)2 3- After adsorption, it is reduced to gold under the action of electrons provided by the cathode, realizing the one-step conversion of Au(S2O3)2 3- Direct reduction enrichment to gold element simplifies Au(S2O3)2 3- Recycling process flow.

[0082] (3) This device sprays a gold-philic porous material onto the electrode to enhance the Au(S2O3)2 3- Adsorbed at the cathode, a high concentration gradient is formed between the cathode surface and the bulk of the solution, making Au(S2O3)2 3- Faster diffusion to the cathode further improves the recovery efficiency and the trace amount of Au(S2O3)2 3- recycling effect.

[0083] Compared with the prior art, the technical solution provided by this application has the following beneficial technical effects: In the embodiment of the present application, an aeration anti-oxidation design is implemented in the leaching unit 1, and protective gas is introduced to avoid S2O3 2- The device adopts the electrosorption reduction method in the electrolysis unit 3, and the cathode material converts Au(S2O3)2 3- After adsorption, it is reduced to gold under the action of electrons provided by the cathode, realizing the one-step conversion of Au(S2O3)2 3- Direct reduction enrichment to gold element simplifies Au(S2O3)2 3- Recycling process. This device sprays gold ion adsorption material on the cathode to enhance the Au(S2O3)2 3- Adsorbed on the electrode, a high concentration gradient is formed on the cathode surface and the bulk of the solution, making Au(S2O3)2 3- Faster diffusion to the cathode further improves the recovery efficiency and the trace amount of Au(S2O3)2 3- recycling effect.

[0084] Those skilled in the art will appreciate that the various operations, methods, steps, measures, and schemes in the processes discussed in this application may be alternated, modified, rearranged, decomposed, combined, or deleted.

[0085] The specific implementation methods of the present application described above do not constitute a limitation on the protection scope of the present application. Any other corresponding changes and modifications made according to the technical concept of the present application should be included in the protection scope of the claims of the present application.

Claims

1. A gold extraction device based on thiosulfate leaching, characterized in that: include: A leaching unit, the leaching unit comprising a reagent tank, a leaching tank and a protective gas tank, the reagent tank and the protective gas tank being both connected to the leaching tank; A filter press unit, the filter press unit comprising a filter press, the filter press being connected to the leaching tank; as well as The electrolysis unit comprises a leachate collection pool, an electrolytic cell and a recovery liquid collection pool, wherein the leachate collection pool is respectively connected to the filter press and the electrolytic cell, and the recovery liquid collection pool is respectively connected to the electrolytic cell and the leaching tank, and the outer side of the cathode of the electrolytic cell is sprayed with gold ion adsorption material and conductive carbon material.

2. A gold extraction device based on thiosulfate leaching according to claim 1, characterized in that: The leaching unit further includes a reagent pump, which is communicated with the outlet of the reagent tank and the inlet of the leaching tank respectively.

3. A gold extraction device based on thiosulfate leaching according to claim 2, characterized in that: The leaching unit further includes a slurry pump. There are multiple leaching tanks, which are arranged on different sides of the reagent tank and are all connected to the reagent tank and the filter press. The slurry pump is connected to two adjacent leaching tanks.

4. A gold extraction device based on thiosulfate leaching according to claim 2, characterized in that: The leaching unit further comprises a plurality of motors and a plurality of stirring paddles, each of the motors being drivingly connected to a stirring paddle, and each stirring paddle partially extending into the inner cavity of the medicine tank or the leaching tank.

5. A gold extraction device based on thiosulfate leaching according to claim 2, characterized in that: The filter press unit also includes a diaphragm pump and a hydraulic oil pump. The filter press is a plate filter press. The hydraulic oil pump abuts against at least one side of the filter plate of the filter press. The diaphragm pump is respectively connected to the outlet of the leaching tank and the inlet of the filter press.

6. A gold extraction device based on thiosulfate leaching according to claim 1, characterized in that: The electrolysis unit also includes a leachate pump and a recovery liquid pump. The leachate pump is connected to the outlet of the leachate collection tank and the inlet of the electrolytic cell respectively, and the recovery liquid pump is connected to the outlet of the electrolytic cell and the inlet of the recovery liquid collection tank respectively.

7. A gold extraction device based on thiosulfate leaching according to claim 6, characterized in that: The electrolysis unit also includes an electrolytic water pump and a circulation pump. There are multiple electrolytic cells, which are arranged at intervals and connected in series in sequence. Each electrolytic water pump is connected to two adjacent electrolytic cells, and each circulation pump is connected to one electrolytic cell. The two electrolytic cells located at both ends are respectively connected to the leachate collection tank and the recovery liquid collection tank.

8. A gold extraction device based on thiosulfate leaching according to claim 1, characterized in that: The anode material of the electrolytic cell includes one of titanium, glassy carbon, silicon carbide, graphite electrode, and graphite felt; the cathode material is a titanium plate or a stainless steel plate; and the gold ion adsorption material includes a sulfide porous material with a conduction band value lower than -0.6V.

9. A method for extracting gold based on thiosulfate leaching, characterized in that: The gold extraction device based on thiosulfate leaching as described in any one of claims 1 to 8 comprises the following steps: Adding reagents and water into a reagent tank to form an extract; A protective gas is introduced into the leaching tank, and gold ore and the leaching solution are added to form a slurry; filtering the slurry in a filter press to form a filtrate; The filtrate is electrolyzed in an electrolytic cell to form gold element and a recovery solution.

10. A method for extracting gold based on thiosulfate leaching according to claim 9, characterized in that: The gold extraction method also includes: Mixing the gold ion adsorption material and the conductive carbon material uniformly; Adding a binder to the mixture and stirring evenly to obtain a slurry; Evenly spraying the slurry onto the outer side of the cathode of the electrolytic cell; The cathode is dried to remove the organic solvent, thereby obtaining a gold ion adsorption electrode.

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