Complete equipment for wet purification of gold

Abstract

The embodiment of the utility model provides gold wet purification complete equipment which comprises a reaction kettle used for mixing and stirring electrolytic analysis gold mud and aqua regia to dissolve gold; the reaction kettle is provided with a hand opening, an aqua regia inlet and a stirrer; the first suction filter is connected with the reaction kettle through a valve and is used for filtering impurities in the gold dissolving solution; the reduction reaction kettle is connected with the suction filter through a vacuum pipeline and used for reducing gold in the gold dissolving solution into sponge gold, and the reduction reaction kettle is provided with a hand hole and a stirrer; the second suction filter is connected with the reduction reaction kettle through a valve and is used for extracting the reduced sponge gold; and the neutralization reaction kettle is connected with the vacuum pipeline and the second suction filter. Through the scheme of the embodiment of the invention, the loss of gold in the refining process can be reduced, operators are protected from body injury, and heavy metal pollution in acid wastewater is reduced so as to realize harmless treatment and zero emission.

Description

Technical Field

[0001] This application relates to the field of metallurgical engineering technology, specifically to a complete set of equipment for wet gold refining. Background Technology

[0002] A complete set of equipment for wet gold refining is a system that extracts high-purity gold from ores or raw materials containing precious metals such as gold and silver through processes such as chemical leaching and electrolysis. Its technical advantages include flexible processes and strong adaptability, making it particularly suitable for processing raw materials with complex mineral compositions. However, this process generates acidic wastewater containing certain heavy metal ions, which may pollute the environment. How to effectively reduce the emission of heavy metals from this acidic wastewater and achieve harmless treatment and zero discharge is a significant environmental challenge facing this technological field. Summary of the Invention

[0003] In view of this, the present disclosure provides a complete set of equipment for wet gold purification, which at least partially solves the problems existing in the prior art.

[0004] This application discloses a complete set of equipment for wet gold refining, comprising:

[0005] A reaction vessel is used to mix and stir electrolytic gold mud and aqua regia to dissolve gold; the reaction vessel is equipped with a hand inlet, an aqua regia inlet, and a stirrer;

[0006] The first filter is connected to the reaction vessel via a valve and is used to filter out impurities from the gold solution.

[0007] The reduction reactor, connected to the filter via a vacuum pipe, is used to reduce gold in the gold solution to sponge gold. The reduction reactor is equipped with a manhole and a stirrer.

[0008] The second filter is connected to the reduction reactor via a valve and is used to extract the reduced sponge gold.

[0009] The neutralization reactor, connected to the vacuum pipeline and the second filter, is used to neutralize and absorb the toxic gases and acidic waste liquid generated during the reaction process.

[0010] Vacuum pipelines connect the reactor, the first vacuum filter, the reduction reactor, the second vacuum filter, and the neutralization reactor, and are used to transfer liquids and gases in a closed environment.

[0011] A solid waste filter, connected to the neutralization reactor, is used for solid-liquid separation of acidic waste liquid;

[0012] The triple-effect evaporation crystallization desalination equipment is connected to the solid waste filter;

[0013] A vacuum unit, serving as a vacuum source, is connected to the vacuum pipeline;

[0014] Aqua regia storage tank, used to store aqua regia.

[0015] Preferably, the first filter is located below the reactor and can directly receive the dissolved liquid discharged from the reactor.

[0016] Preferably, the top of the first filter is connected to the discharge port at the bottom of the reactor via a seamless flange.

[0017] Preferably, the stirrer in the reduction reactor is located at the center of the interior to ensure uniform reduction reaction.

[0018] Preferably, the second filter is connected to the reduction reactor via a flange seal to enhance vacuum sealing.

[0019] Preferably, a liquid level detection system is provided on one side wall of the neutralization reactor. The liquid level detection system includes a PTFE liquid level gauge, which can be used to observe the liquid level inside the neutralization reactor.

[0020] Preferably, the PTFE level gauge is connected to one side wall of the neutralization reactor via a flange, and a sealing gasket is provided at the connection.

[0021] This disclosure provides a complete set of equipment for wet gold purification, including: a reaction vessel for mixing and stirring electrolytic gold mud and aqua regia to dissolve gold; the reaction vessel is equipped with a manhole, an aqua regia inlet, and a stirrer; a first vacuum filter connected to the reaction vessel via a valve for filtering out impurities in the gold solution; a reduction reaction vessel connected to the vacuum filter via a vacuum pipe for reducing the gold in the gold solution to sponge gold, the reduction reaction vessel being equipped with a manhole and a stirrer; and a second vacuum filter connected to the reduction reaction vessel via a valve for extracting the reduced gold. The system comprises: a sponge gold bath; a neutralization reactor connected to the vacuum pipeline and the second filter for neutralizing and absorbing toxic gases and acidic wastewater generated during the reaction; a vacuum pipeline connected between the reactor, the first filter, the reduction reactor, the second filter, and the neutralization reactor for transferring liquids and gases in a closed environment; a solid waste filter connected to the neutralization reactor for solid-liquid separation of the acidic wastewater; a triple-effect evaporation crystallization desalination device connected to the solid waste filter; a vacuum unit connected to the vacuum pipeline as a vacuum source; and an aqua regia storage tank for storing aqua regia. The solution provided by this embodiment addresses how to reduce heavy metal pollution in acidic wastewater and achieve harmless treatment and zero discharge. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the exemplary embodiments of this disclosure, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this disclosure and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the structure of a complete set of equipment for wet gold refining as described in this utility model;

[0024] Figure 2 This is a front sectional view of the reaction vessel in a complete set of equipment for wet gold purification as described in this utility model;

[0025] Figure 3 This is a front view of the neutralization reactor in a complete set of equipment for wet gold purification as described in this utility model;

[0026] Figure 4 This is a front sectional view of the solid waste filter in a complete set of wet gold purification equipment described in this utility model.

[0027] In the diagram: 1. Reactor; 2. First Filter; 3. Reduction Reactor; 4. Second Filter; 5. Neutralization Reactor; 51. Liquid Level Detection System; 6. Vacuum Pipeline; 7. Solid Waste Filter; 71. Filter Plate; 8. Triple-Effect Evaporation Crystallization Desalination Equipment; 9. Vacuum Unit; 10. Aqua Regia Storage Tank Detailed Implementation

[0028] The embodiments of this disclosure will now be described in detail with reference to the accompanying drawings.

[0029] The following specific examples illustrate the implementation of this disclosure. Those skilled in the art can easily understand other advantages and effects of this disclosure from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of this disclosure, and not all of them. This disclosure can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this disclosure. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. Based on the embodiments in this disclosure, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this disclosure.

[0030] like Figure 1As shown, a complete set of wet gold purification equipment according to this application includes: a reaction vessel 1 for mixing and stirring gold cyanide mud and aqua regia to dissolve gold; a first suction filter 2 for filtering impurities from the gold solution; a reduction reaction vessel 3 for reducing gold in the gold solution to sponge gold and equipped with an inlet for adding a reducing agent and a stirring device; a second suction filter 4 for extracting the reduced sponge gold; a neutralization reaction vessel 5 connected to a vacuum pipeline 6 and absorbing toxic gases and acidic waste liquid through it; a vacuum pipeline 6 running through all the components; a vacuum unit 9 for controlling the vacuum degree within the system; an aqua regia storage tank 10 for storing the aqua regia required for reacting with the gold cyanide mud; a solid waste filter 7 connected to the neutralization reaction vessel 5 for solid-liquid separation of the acidic waste liquid; and a triple-effect evaporation crystallization desalination device 8 connected to the solid waste filter 7 for completing the desalination treatment of greywater.

[0031] As a key piece of equipment, the reaction vessel 1 is typically located at the very beginning of the entire system. It houses a high-intensity stirring mechanism capable of efficiently and thoroughly mixing liquids and solid powders (such as gold cyanide sludge). The reaction vessel 1 features a manhole for manual operation, facilitating the addition of materials; it also has an inlet for connecting to aqua regia and a series of vacuum pipe interfaces for connecting to other components. In practical implementation, the contact between the material and the solution can be made more uniform by adjusting the rotation speed and stirring method (paddle agitator or propeller agitator).

[0032] The first vacuum filter 2 is arranged adjacent to the reactor 1 and connected to the discharge end of the reactor 1 via a sealed vacuum pipe 6. This device mainly consists of a filter membrane and a suction chamber. A suction channel is provided below the filter membrane to quickly remove the clear liquid after removing impurities from the liquid phase. By precisely selecting multilayer filter membrane materials of different specifications (such as polytetrafluoroethylene membranes), it is ensured that larger particles or other insoluble substances in the solution can be effectively isolated. The entire structure is compact and can withstand a certain vacuum pressure.

[0033] The reduction reactor 3 is located downstream of the first vacuum filter 2 and is connected to the subsequent vacuum filter via a vacuum pipe 6. Its internal design ensures good airtightness, and it is equipped with a manhole for adding reducing agent and a stirrer to promote thorough mixing between the liquid and the reducing agent. For example, a paddle-type spiral blade design can be selected for the stirrer, which can ensure uniform dispersion of the material and complete the chemical reduction process in a shorter time, ultimately yielding the sponge gold product.

[0034] The second vacuum filter 4 is directly connected to the reduction reactor 3. Its function is to further filter out the sponge gold product obtained after reduction, preventing residual liquid from contaminating its surface. Its core components also consist of a precision filter membrane and a matching filter press element. In specific implementation, a filter unit with an automatic backwashing function can be selected to extend the service life of the equipment and ensure continuous production.

[0035] The neutralization reactor 5 is connected in series to the entire loop system via an additional vacuum pipe 6, primarily serving to collect harmful volatile gases or residual liquids discharged from various stages. During the neutralization process, appropriate alkaline agents are typically used to react with these pollutants, generating more stable and safer products for later discharge and treatment. For example, lime slurry is dripped into the absorption tank to achieve real-time conversion and treatment of acidic components in the gas, thereby reducing environmental pollution.

[0036] Six vacuum pipelines run through all the main working modules of the entire system, operating under closed conditions from raw material feeding to product collection, eliminating the possibility of leakage and potential ecological threats. Through the rational layout and parameter settings of pipe diameter and joint types, each node can smoothly transmit materials while meeting the high-efficiency ventilation and exhaust requirements of a vacuum environment.

[0037] Vacuum unit 9, as an important equipment facility for generating and maintaining low-pressure conditions inside the overall system, is generally placed in an open area outside the factory building for easy management and maintenance.

[0038] like Figure 2 As shown, in one embodiment, the reactor 1, as a key component, is made of titanium to enhance its corrosion resistance. Since the wet gold refining process requires the handling of aqua regia and other highly corrosive chemical solutions, the choice of material for reactor 1 is crucial to its performance. Specifically, titanium, with its excellent corrosion resistance, is particularly suitable for the demands of such process environments. Furthermore, this material selection ensures sufficient stability of reactor 1 during prolonged contact with cyanide sludge and strong acid mixtures. By using titanium to construct reactor 1, which carries the mixing reaction, and by ensuring close integration with components such as the filter and reduction reactor 3, the precision of material transfer at each stage of the entire purification system is achieved.

[0039] For example, the actual application effect of titanium materials can be ensured by improving the overall structure of the reactor 1 and combining it with precision machining technology. Specifically, the cylindrical reactor 1 body made of titanium is placed on a fixed base and equipped with a sealing cover on top. In addition, the reactor 1 is connected to the first filter 2 through a vacuum pipe 6, and is equipped with independent manholes, aqua regia inlets, and other functional interfaces to meet diverse operational needs. These components are connected by sealing flanges or special welding to avoid any form of leakage, thereby ensuring the safety and efficiency of the entire equipment operation.

[0040] In one embodiment, to ensure the smooth transfer of the solution from reactor 1 to subsequent processing units while maintaining the integrity of the closed system, the first vacuum filter 2 is designed to be located directly below reactor 1, receiving the liquid discharged from reactor 1 directly through a specific interface and vacuum pipe 6. This arrangement minimizes the liquid flow path, reducing piping complexity and potential leakage points, while also optimizing the overall equipment layout. In this design, the first vacuum filter 2 consists of a suction pump and a filter element, which together separate insoluble impurities from the liquid. The suction pump guides the liquid flow under vacuum, while the filter element performs preliminary purification.

[0041] In one embodiment, the top interface of the first filter 2 and the discharge port at the bottom of the reactor 1 are connected by a seamless flange to achieve the above-mentioned functional requirements, ensuring continuous and stable liquid flow. Furthermore, by precisely setting the height difference between the two, the technical objective of relying on gravity to complete the solution transfer process can be further assisted, making the entire process smooth and efficient.

[0042] In one embodiment, a stirrer is installed inside the reduction reactor 3 to ensure that the reduction reaction proceeds uniformly. Specifically, the stirrer is positioned at the center of the reduction reactor 3; this installation method facilitates thorough mixing of the gold solution and reducing agent during operation. By placing the stirrer in the center, a relatively stable hydrodynamic field is formed, thereby avoiding potential localized over- or under-reduction phenomena during the reaction, making the reduction reaction more reliable.

[0043] For example, the above function can be achieved by vertically introducing the stirring shaft into the reduction reactor 3 from the top and fixing it at the center point, while the bottom of the stirring shaft is equipped with a multi-layered blade structure. The specific form of the blades can be selected according to actual needs, such as propeller type, paddle type, or frame type, and power is transmitted through a drive motor connected to the top of the stirring shaft. With this structural design, the stirring device can provide uniformly distributed shear force and mixing capacity for the materials during the reduction reaction. At the same time, the design of the reduction reactor 3 must consider the sealed connection between it and the second suction filter 4 and the vacuum pipeline 6, so as to ensure that the overall system remains in a closed state. This arrangement not only meets the functional requirements of the components, but also meets the operational requirements of the integrated system.

[0044] like Figure 1As shown, in one embodiment, the reduction reactor 3 and the second vacuum filter 4 are sealed together via flanges. This flange connection mainly consists of a pair of mating flanges and a sealing gasket, ensuring efficient vacuum sealing performance during operation. The flanges are installed between the discharge end of the reduction reactor 3 and the feed end of the second vacuum filter 4, specifically by bolting the two flanges tightly together and pressing the sealing gasket, thereby preventing external air intrusion or internal material leakage. This design meets the high requirements of this type of equipment for a sealed environment and ensures stability during material transfer.

[0045] For example, the discharge end of the reduction reactor 3 and the inlet end of the second filter 4 are each equipped with a standard flange with fixing bolt holes. A high-temperature and corrosion-resistant sealing gasket is placed between the two flanges, and then bolts are tightened in place to ensure that the mechanical strength and airtightness of the entire joint meet the process requirements. In addition, the flange material can be selected according to the actual working conditions, such as stainless steel or composite materials, to resist corrosion from cyanide and strong acids. Specifically, this connection part also needs to undergo pre-pressure testing to further verify its reliability.

[0046] like Figure 3 As shown in one embodiment, a complete set of gold wet purification equipment according to this application is characterized in that a liquid level detection system 51 for real-time detection of liquid level changes is installed on one side wall of the neutralization reactor 5. This system specifically uses a PTFE level gauge, which has good corrosion resistance and transparency, allowing direct observation of the liquid level height inside the neutralization reactor 5, and can output signals for subsequent monitoring and control of the process. The position of the liquid level detection system 51 is optimized and set on the outer wall of the neutralization reactor 5, avoiding interference with the flow characteristics of the internal fluid or reactants. This component mainly consists of a PTFE shell and an internal sensing mechanism, possessing high sensitivity and stability to ensure continuous operation in complex working environments.

[0047] In one embodiment, the PTFE level gauge is fixed to one side wall of the neutralization reactor 5 via a flange connection. A sealing gasket is provided at the connection point to effectively ensure its airtightness and facilitate future maintenance and replacement. Simultaneously, its sensing end extends into the reactor to a certain depth, while the data display module remains on the external operating surface. The overall structure neither disrupts the original connection between the neutralization reactor 5 and other components (such as the vacuum pipeline 6 or the solid waste filter 7) nor compromises the technical requirements for accurate data reading. Specifically, the level gauge's data line can be extended and connected to the main control system for centralized management as needed.

[0048] In one embodiment, the vacuum pipe 6 is wrapped with a specific material. This material is an acid and alkali resistant, heat-insulating material, which is directly attached to the outer wall of the vacuum pipe 6 and firmly bonded by physical or chemical means. This design prevents acid and alkali corrosion caused by leakage of reactive liquids or gases during equipment operation, while reducing the impact of the fluid temperature inside the pipe on the external environment.

[0049] The acid and alkali resistant insulation material consists of a multi-layered composite structure, including a base layer, an insulation protective layer, and an anti-corrosion surface coating. The layers are tightly bonded together using adhesives or compression molding. Furthermore, to ensure insulation performance without compromising the internal airtightness and wiring performance of the vacuum pipe 6, the insulation material is designed as a customized unit that can flexibly adapt to the shape of the pipe, whether it bends or straight.

[0050] Specifically, firstly, suitable heat-insulating and corrosion-resistant raw materials, such as fluoroplastics or special ceramic coating materials, are selected for the process conditions; then, these materials are cut and processed to matching dimensions according to the actual pipeline layout and are wrapped and installed on site to meet the needs of the complete set of equipment in the wet purification process.

[0051] like Figure 4 As shown, in one embodiment, a filter plate layer 71 is disposed inside the solid waste filter 7. The filter plate layer 71 is arranged vertically at intervals within the solid waste filter 7, with a spacing of 0.5-1.5 mm. The filter plate layer 71 is composed of multiple composite materials and its main function is to achieve refined solid-liquid separation of acidic waste liquid. It is located in the central region of the solid waste filter 7 cavity, with both ends fixedly connected to the inner wall of the solid waste filter 7 housing. This arrangement does not affect fluid flow while ensuring effective interception of solid particles.

[0052] For example, the filter plates 71 are fixed to the predetermined positions of the solid waste filter 7 by means of bolts or welding, ensuring that the parallelism and gaps between the plates meet the design requirements. At the same time, the filter plates 71 should be made of corrosion-resistant materials to adapt to the acidic media environment generated during the wet gold purification process, thereby extending their service life and ensuring the stable operation of the overall system.

[0053] like Figure 1As shown, in one embodiment, the solid waste filter 7 is connected to a triple-effect evaporation crystallization desalination device 8. The triple-effect evaporation crystallization desalination device 8 is installed at the end of the overall equipment's processing flow and is fluidly connected to the solid waste filter 7 via a specially structured pipeline. The solid waste filter 7 performs preliminary solid-liquid separation of the acidic waste liquid and directs the liquid portion to downstream devices for further treatment. The triple-effect evaporation crystallization desalination device 8 receives a portion of the wastewater discharged from the solid waste filter 7 and converts it into a highly concentrated waste liquid product. The two are connected by a special pipeline design to ensure efficient transport while preventing potential leaks in intermediate stages.

[0054] For example, a pressure compensation valve or buffer tank can be added before the triple-effect evaporation crystallization desalination equipment 8 to maintain a stable liquid inlet, while ensuring that the inner diameter of the pipeline connected to the solid waste filter 7 is compatible and has excellent corrosion resistance. These designs all contribute to improving the overall operational coordination and durability of the equipment. Specifically, the pipeline can adopt a double-layer sealing interface to ensure reliable connection, and the internal structure includes a first evaporator, a second evaporator, and a final crystallization unit connected in sequence, which work together to complete the waste liquid concentration treatment task.

[0055] In actual operation, when this device is in use, gold cyanide sludge is added to reactor 1, while aqua regia is supplied to reactor 1 through aqua regia storage tank 10 for mixing and stirring to achieve the gold dissolution process. Subsequently, the liquid mixture enters the first vacuum filter 2 for impurity filtration and is transferred to the reduction reactor 3 via vacuum pipeline 6. Here, a reducing agent is added and the stirrer is activated to reduce the gold in the gold solution to sponge gold. After the reduced mixture passes through the second vacuum filter 4 to extract the sponge gold, it is then sent to the neutralization reactor 5 for neutralization treatment to absorb toxic gases and acidic waste liquid. During this process, the generated acidic waste liquid enters the solid waste filter 7 for solid-liquid separation, and the separated wastewater is sent to the triple-effect evaporation crystallization desalination equipment 8 for further treatment to desalinate. The closed-loop operation of the entire system is maintained by a stable vacuum provided by the vacuum unit 9, ensuring effective control of harmful gases and liquids in each step.

[0056] The above description is the preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this invention, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A complete set of equipment for wet gold refining, characterized in that, include: The reaction vessel (1) is used to mix and stir the electrolytic gold mud and aqua regia to dissolve the gold; The reactor (1) is equipped with a hand opening, an aqua regia inlet, and a stirrer; The first filter (2) is connected to the reaction vessel (1) via a valve and is used to filter out impurities in the gold solution; The reduction reactor (3) is connected to the filter (2) through a vacuum pipe (6) and is used to reduce gold in the gold solution to sponge gold. The reduction reactor (3) is equipped with a manhole and a stirrer. The second filter (4) is connected to the reduction reactor (3) via a valve and is used to extract the reduced sponge gold. The neutralization reactor (5) is connected to the vacuum pipe (6) and the second filter (4) for neutralizing and absorbing toxic gases and acidic waste liquid generated during the reaction process; Vacuum pipe (6) is connected between reactor (1), first vacuum filter (2), reduction reactor (3), second vacuum filter (4) and neutralization reactor (5) for transferring liquid and gas in a closed environment; A solid waste filter (7) is connected to the neutralization reactor (5) for solid-liquid separation of acidic waste liquid; The triple-effect evaporation crystallization desalination equipment (8) is connected to the solid waste filter (7); The vacuum unit (9) is connected to the vacuum pipe (6) as a vacuum source; Aqua regia storage tank (10) is used to store aqua regia.

2. A gold hydrometallurgical purification plant according to claim 1, characterized in that: The first filter (2) is located below the reactor (1) and can directly receive the dissolved liquid discharged from the reactor.

3. A gold hydrometallurgical purification plant according to claim 2, characterized in that: The top of the first filter (2) is connected to the discharge port at the bottom of the reactor (1) by a seamless flange.

4. The complete set of equipment for gold hydrometallurgy purification according to claim 1, characterized by the fact that: The stirrer in the reduction reactor (3) is located in the center of the interior to ensure uniform reduction reaction.

5. A gold hydrometallurgical purification plant according to claim 1, characterized in that: The second vacuum filter (4) is connected to the reduction reactor (3) by a flange seal to enhance vacuum sealing.

6. A gold hydrometallurgical purification plant according to claim 1, characterized in that: A liquid level detection system (51) is provided on one side wall of the neutralization reactor (5). The liquid level detection system (51) includes a PTFE level gauge, which can be used to observe the liquid level in the neutralization reactor.

7. The complete set of equipment for wet gold refining according to claim 6, characterized in that: The PTFE level gauge is connected to one side wall of the neutralization reactor (5) via a flange, and a sealing gasket is provided at the connection.

Images