Microbial oxidation gold extraction staging system

Abstract

The embodiment of the application provides a microbial oxidation gold extraction grading system, which comprises an active cultivation tank, a preliminary oxidation tank, a deep oxidation tank and a buffer oxidation tank, wherein the active cultivation tank is used for cultivating the activity of bacteria in the ore pulp to obtain bacteria-containing ore pulp; the preliminary oxidation tank is used for performing preliminary oxidation treatment on the bacteria-containing ore pulp to obtain preliminary oxidation ore pulp; the deep oxidation tank is used for performing deep oxidation treatment on the preliminary oxidation ore pulp to obtain deep oxidation ore pulp; and the buffer oxidation tank is used for performing stirring treatment on the deep oxidation ore pulp. In the embodiment, the ore pulp is sequentially subjected to biological activity cultivation, mild oxidation, intensified oxidation and steady-state buffering through the multiple treatment tanks, so that the gold can be completely dissociated and the passivation layer on the surface of the mineral can be avoided from being formed too early, the recovery rate of the system is effectively improved, the energy consumption of the system is reduced, and the gold extraction cost is reduced.

Description

Technical Field

[0001] This application relates to the field of microbial metallurgy technology, specifically to a microbial oxidation gold extraction and classification system. Background Technology

[0002] Biological oxidation gold extraction technology utilizes microorganisms found in nature. Selected sulfur- and iron-loving leaching strains are cultivated and domesticated, and under suitable conditions, these microorganisms oxidize and decompose the sulfide ore matrix through direct metabolism or the indirect action of their metabolic products. This process destroys harmful components such as pyrite and arsenopyrite that encapsulate gold, thus fully exposing the gold. The pre-microbial treatment of gold ore or concentrate is primarily carried out in a biological oxidation stirred tank. This process often requires strict control of factors affecting the biological oxidation process and gold extraction efficiency, such as pH, temperature, aeration rate, stirring speed, nutrients, and suspension uniformity. However, existing methods generally involve directly adding the microbial strain to the ore slurry, using excessive air and high stirring intensity to ensure sufficient oxygen levels for microbial oxidation. In industrial applications, this approach suffers from high energy consumption, long oxidation cycles, and relatively poor gold extraction efficiency. Utility Model Content

[0003] In view of the technical problems existing in the background art, this application provides a microbial oxidation gold extraction classification system, which uses a multi-stage treatment tank to sequentially carry out four-stage synergistic treatment of the slurry: biological activity cultivation → mild oxidation → enhanced oxidation → steady-state buffering. This not only completely dissociates the gold from the mineral and avoids the premature formation of a passivation layer on the mineral surface, effectively improving the system's recovery rate, but also reduces the system's energy consumption, thereby reducing the cost of gold extraction.

[0004] This application provides a microbial oxidation gold extraction and grading system, including: An active culture tank is used to cultivate the activity of microorganisms in mineral slurry in order to obtain a microbial slurry. A preliminary oxidation tank, which is connected to the output end of the active cultivation tank, is used to perform preliminary oxidation treatment on the bacterial slurry to obtain a preliminary oxidized slurry. A deep oxidation tank, which is connected to the output end of the primary oxidation tank, is used to perform deep oxidation treatment on the primary oxidation slurry to obtain a deep oxidation slurry. A buffer oxidation tank, which is connected to the output end of the deep oxidation tank, is used to stir the deep oxidation slurry.

[0005] Furthermore, in this embodiment, the capacity of the active culture tank is smaller than the capacity of the preliminary oxidation tank.

[0006] Furthermore, in this embodiment, multiple active culture tanks are provided, and all of the multiple active culture tanks are connected to the preliminary oxidation tank.

[0007] Furthermore, in this embodiment, the preliminary oxidation tank and the deep oxidation tank have the same volume.

[0008] Furthermore, in this embodiment, the active culture tank, the preliminary oxidation tank, and the deep oxidation tank each include: The tank is used to receive mineral slurry; An aeration component is disposed in the tank and is used to adjust the oxygen content of the slurry in the tank. A temperature regulating component is disposed in the tank and is used to regulate the temperature of the slurry in the tank. A stirring device, wherein the stirring end of the stirring device is placed inside the tank, is used to stir the slurry inside the tank.

[0009] Furthermore, in this embodiment, the aeration component is disposed at the bottom end of the tank.

[0010] Furthermore, in this embodiment, the aeration component is provided with multiple air outlets, which are evenly arranged at the bottom of the tank.

[0011] Furthermore, in this embodiment, the temperature regulating component includes a heat exchanger and a delivery pipe. The heat exchanger is disposed in the tank and is arranged along the height direction of the tank. The delivery pipe is connected to the heat exchanger and is used to deliver heat medium to the heat exchanger.

[0012] Furthermore, in this embodiment, a control device is also included, which is electrically connected to the stirring device and is used to control the stirring device.

[0013] Furthermore, in this embodiment, the active culture tank, the preliminary oxidation tank, and the deep oxidation tank all include overflow pipes. The overflow pipes are used to connect the two tanks. One end of the overflow pipe is located at the upper liquid level of the tank, and the other end of the overflow pipe is connected to the other tank.

[0014] Beneficial Effects: This application provides a microbial oxidation gold extraction classification system, including an active cultivation tank, a preliminary oxidation tank, a deep oxidation tank, and a buffer oxidation tank. The active cultivation tank is used to cultivate the activity of microorganisms in the slurry to obtain a microbially-containing slurry. The preliminary oxidation tank is used to perform preliminary oxidation treatment on the microbially-containing slurry to obtain a preliminary oxidized slurry. The deep oxidation tank is used to perform deep oxidation treatment on the preliminary oxidized slurry to obtain a deeply oxidized slurry. The buffer oxidation tank is used to agitate the deeply oxidized slurry. In this embodiment, the slurry undergoes a four-stage synergistic treatment process—biological activity cultivation → mild oxidation → enhanced oxidation → steady-state buffering—through multiple treatment tanks. This not only completely dissociates the gold from its inclusions and prevents premature passivation layer formation on the mineral surface, effectively improving the system's recovery rate, but also reduces system energy consumption, thereby lowering the gold extraction cost.

[0015] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of this application, the accompanying drawings used in this application will be briefly described below. Obviously, the drawings described below are merely some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without any creative effort.

[0017] Figure 1 This application provides a schematic diagram of the structure of a microbial oxidation gold extraction and grading system. Figure 2 This is a schematic diagram of the structure of the tank in the embodiment of this application.

[0018] Explanation of reference numerals in the attached figures: 10. Active culture tank; 110. Tank body; 120. Aeration component; 121. Air outlet; 130. Temperature control assembly; 131. Heat exchanger; 132. Conveying pipeline; 140. Stirring device; 20. Preliminary oxidation tank; 30. Deep oxidation tank; 40. Buffer oxidation tank; 50. Overflow pipe. Detailed Implementation

[0019] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0021] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0022] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0023] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0024] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0025] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0026] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0027] Biological oxidation gold extraction technology utilizes microorganisms found in nature. Selected sulfur- and iron-loving leaching strains are cultivated and domesticated, and under suitable conditions, these microorganisms oxidize and decompose the sulfide ore matrix through direct metabolism or the indirect action of their metabolic products. This process destroys harmful components such as pyrite and arsenopyrite that encapsulate gold, thus fully exposing the gold. The pre-microbial treatment of gold ore or concentrate is primarily carried out in a biological oxidation stirred tank. This process often requires strict control of factors affecting the biological oxidation process and gold extraction efficiency, such as pH, temperature, aeration rate, stirring speed, nutrients, and suspension uniformity. However, existing methods generally involve directly adding the microbial strain to the ore slurry, using excessive air and high stirring intensity to ensure sufficient oxygen levels for microbial oxidation. In industrial applications, this approach suffers from high energy consumption, long oxidation cycles, and relatively poor gold extraction efficiency.

[0028] To address the shortcomings of existing bio-oxidation gold extraction technologies, which typically involve directly introducing microorganisms into the slurry and using excessive air and high agitation to ensure sufficient oxygen levels for microbial oxidation, resulting in high energy consumption, long oxidation cycles, and relatively low gold extraction efficiency in industrial applications, this application provides a microbial oxidation gold extraction staged system. This system employs a multi-stage treatment tank to sequentially process the slurry through a four-stage synergistic process: bio-active cultivation → mild oxidation → enhanced oxidation → steady-state buffering. This system not only completely dissociates gold from its encapsulation and prevents premature passivation layer formation on the mineral surface, effectively improving the system's recovery rate, but also reduces system energy consumption, thereby lowering gold extraction costs.

[0029] Please refer to Figure 1 , Figure 1 This application provides a schematic diagram of a microbial oxidation gold extraction and grading system.

[0030] like Figure 1As shown in the embodiment of this application, a microbial oxidation gold extraction grading system is provided, including an active cultivation tank 10, a preliminary oxidation tank 20, a deep oxidation tank 30, and a buffer oxidation tank 40. The active cultivation tank 10 is used to cultivate the activity of microorganisms in the slurry to obtain a microbially-containing slurry; the preliminary oxidation tank 20 is used to perform preliminary oxidation treatment on the microbially-containing slurry to obtain a preliminary oxidized slurry; the deep oxidation tank 30 is used to perform deep oxidation treatment on the preliminary oxidized slurry to obtain a deeply oxidized slurry; and the buffer oxidation tank 40 is used to stir the deeply oxidized slurry. In this embodiment, the slurry undergoes a four-stage synergistic treatment through multi-stage treatment tanks: bio-active cultivation → mild oxidation → enhanced oxidation → steady-state buffering. This not only completely dissociates the gold from its encapsulation and prevents premature passivation layer formation on the mineral surface, effectively improving the system's recovery rate, but also reduces system energy consumption, thereby reducing gold extraction costs.

[0031] For example, in this embodiment, the gold-bearing crude ore is concentrated, de-treated, and washed to obtain a slurry. Inoculum, culture medium, and other auxiliary materials are added to the slurry, which is then placed in an active cultivation tank 10 for biological activity cultivation to activate the microbial community, thus obtaining a microbial slurry. The microbial slurry is transferred to a preliminary oxidation tank 20 for initial oxidation treatment to decompose easily oxidizable sulfides in the mineral, achieving preliminary dissociation of the target mineral and obtaining a preliminary oxidized slurry. The preliminary oxidized slurry in the preliminary oxidation tank 20 is transferred to a deep oxidation tank 30 for further treatment to thoroughly oxidize refractory sulfides / inclusions and fully expose gold particles, obtaining a deep oxidized slurry. The deep oxidized slurry is then transferred to a buffer oxidation tank 40 for stirring to maintain a homogenized oxidation environment, eliminate the influence of fluctuations in the previous stage, and ensure uniform oxidation of the slurry entering the cyanidation stage.

[0032] In some embodiments, the capacity of the active culture tank 10 is smaller than that of the primary oxidation tank 20. It is understood that in this embodiment, the small-volume active culture tank 10 enables the microbial community to quickly reach the exponential growth phase, thereby rapidly cultivating microbial activity. Simultaneously, while achieving rapid cultivation of microbial activity, the small-volume active culture tank 10 can shorten the residence time of the bacterial slurry, thereby reducing the risk of exogenous microbial invasion and maximizing microbial activity.

[0033] In some embodiments, multiple active culture tanks 10 are provided, and all multiple active culture tanks 10 are connected to the primary oxidation tank 20. It can be understood that in this embodiment, multiple active culture tanks 10 simultaneously cultivate microbial activity, and the cultivated bacterial slurry is simultaneously input into the same primary oxidation tank 20. By converging multiple small-capacity active culture tanks 10 into a large-capacity primary oxidation tank 20, the volume is increased, ensuring that the microorganisms adapt to the gold extraction working environment and improving the oxidation reaction rate.

[0034] In some embodiments, the primary oxidation tank 20 and the deep oxidation tank 30 have the same volume. It can be understood that, in this embodiment, after the slurry completes the primary oxidation in the primary oxidation tank 20, the primary oxidized slurry is input into the deep oxidation tank 30 of the same capacity for deep oxidation treatment.

[0035] In some embodiments, such as Figure 2 As shown, the active cultivation tank 10, the preliminary oxidation tank 20, and the deep oxidation tank 30 all include a tank body 110, an aeration component 120, a temperature control component 130, and a stirring device 140. The tank body 110 is used to receive the slurry; the aeration component 120 is located inside the tank body 110 and is used to regulate the oxygen content of the slurry within the tank body 110; the temperature control component 130 is located inside the tank body 110 and is used to regulate the temperature of the slurry within the tank body 110; the stirring end of the stirring device 140 is located inside the tank body 110 and is used to stir the slurry within the tank body 110. During use, after the slurry is placed in the tank body 110, the aeration component 120 and the temperature control component 130 are controlled. Air or oxygen is introduced into the slurry through the aeration component 120 to regulate the dissolved oxygen content of the slurry, and the temperature is regulated by the temperature control component 130 to regulate the temperature of the slurry, allowing the microorganisms within the slurry to maintain high activity and reaction rate within the optimal temperature range. Meanwhile, a stirring device 140 is also provided in the tank 110. The stirring device 140 stirs the slurry in the tank 110, which can not only make the slurry, microorganisms, oxygen and nutrients evenly mixed, preventing the slurry from settling and solid particles from depositing, but also avoid local overheating or overcooling.

[0036] In this embodiment, only a stirring device 140 is provided in the buffer oxidation tank 40. It can be understood that after the deep oxidation slurry is transferred to the buffer oxidation tank 40, it stays in the buffer oxidation tank 40 for a period of time to allow the remaining rapid oxidation reaction to complete naturally. The stirring device 140 in the buffer oxidation tank 40 can stir the slurry in the buffer oxidation tank 40 so as to make the slurry composition (solid particles, liquid phase, reaction products) highly uniform and avoid stratification or sedimentation.

[0037] In some embodiments, the aeration assembly 120 is disposed at the bottom end of the tank 110. It is understood that during use, oxygen-containing gas is introduced into the tank 110 through the aeration assembly 120. The aeration assembly 120 is disposed at the bottom of the tank 110, and the oxygen-containing gas introduced by the aeration assembly 120 rises from the bottom to the top of the tank 110. The continuous airflow output by the aeration assembly 120 can agitate the slurry at the bottom of the tank 110, thereby preventing the mineral particles in the slurry from caking and eliminating dead zones.

[0038] In some embodiments, the aeration component 120 is provided with a plurality of air outlets 121, which are evenly arranged at the bottom of the tank 110. By providing a plurality of air outlets 121 at the bottom of the tank 110, a distributed aeration structure is formed at the bottom, further improving the uniformity of aeration of the slurry in the tank 110 by the aeration component 120.

[0039] In some embodiments, the temperature regulating assembly 130 includes a heat exchanger 131 and a delivery pipe 132. The heat exchanger 131 is disposed within the tank 110 and is arranged along the height direction of the tank 110. The delivery pipe 132 is connected to the heat exchanger 131 and is used to deliver heat medium to the heat exchanger 131. During use, the system inputs heat medium to the heat exchanger 131 through the delivery pipe 132.

[0040] The heat exchanger 131, a core heat exchange component, is responsible for transferring heat between the heat medium (such as steam, hot water, thermal oil, chilled water, etc.) and the slurry inside the tank 110. Common forms include coils, plates, tube bundles, and jackets. The transport pipeline 132 acts as a "highway" for the heat medium, responsible for transporting the heat medium from external heat sources (such as boilers, chillers, heat pumps, etc.) to the heat exchanger 131, and transporting the heat medium after heat exchange (which may become condensate or cooled fluid) back to the heat source system or discharge point.

[0041] Specifically, in this embodiment, the heat medium is sent from the inlet pipe of the conveying pipeline 132 to the heat exchanger 131 at high temperature (when heating) or low temperature (when cooling). After the heat medium transfers heat with the slurry in the tank 110, the heat medium that has released heat (when heating) or absorbed heat (when cooling) is drawn out from the heat exchanger 131 from the outlet pipe of the heat exchanger 131.

[0042] In this embodiment, the heat exchanger 131, which is arranged along the height direction of the tank 110, effectively increases the contact area of ​​the heat exchanger 131, enhances the heat exchange efficiency, and can also heat / cool the medium in the upper, middle and lower layers of the tank 110, avoiding the "hot at the top and cold at the bottom" or "hot at the bottom and cold at the top" problems that occur in traditional horizontal installation, eliminating vertical temperature difference and improving temperature uniformity.

[0043] In some embodiments, a control device is also included. The control device is electrically connected to the stirring device 140 and is used to control the stirring device 140. It is understood that in this embodiment, the control device can control the stirring devices 140 in the active culture tank 10, the preliminary oxidation tank 20, the deep oxidation tank 30 and the buffer oxidation tank 40 respectively, and thus control the stirring efficiency of the stirring devices 140 in the active culture tank 10, the preliminary oxidation tank 20, the deep oxidation tank 30 and the buffer oxidation tank 40 as needed.

[0044] In some embodiments, the active cultivation tank 10, the preliminary oxidation tank 20, and the deep oxidation tank 30 all include an overflow pipe 50. The overflow pipe 50 connects the two tanks 110. When the slurry in the tank 110 reaches the upper liquid level, the slurry in the tank 110 is transported to the other tank 110 through the overflow pipe 50. It can be understood that, in this embodiment, the flow of slurry between the active cultivation tank 10, the preliminary oxidation tank 20, and the deep oxidation tank 30 is achieved through an overflow channel.

[0045] For example, in this embodiment, the overflow pipe 50 can not only be used to connect the two tanks 110, but also to detect the amount of slurry in the tank 110. When the slurry in the tank 110 reaches the upper liquid level, the overflow channel is opened to transport the excess slurry in the tank 110 to the other tank 110 and to stop the continued delivery of slurry into the tank 110.

[0046] It should be noted that this application is not limited to the above-described embodiments. The above embodiments are merely examples, and any embodiments with the same structure and effect as the technical concept within the scope of this application are included in the technical scope of this application. Furthermore, various modifications that can be conceived by those skilled in the art to the embodiments, and other ways of constructing by combining some of the constituent elements of the embodiments, without departing from the spirit of this application, are also included in the scope of this application.

Claims

1. A microbial oxidation gold extraction and grading system, characterized in that, include: An active culture tank is used to cultivate the activity of microorganisms in mineral slurry in order to obtain a microbial slurry. A preliminary oxidation tank, which is connected to the output end of the active cultivation tank, is used to perform preliminary oxidation treatment on the bacterial slurry to obtain a preliminary oxidized slurry. A deep oxidation tank, which is connected to the output end of the primary oxidation tank, is used to perform deep oxidation treatment on the primary oxidation slurry to obtain a deep oxidation slurry. A buffer oxidation tank, which is connected to the output end of the deep oxidation tank, is used to stir the deep oxidation slurry.

2. The microbial oxidation gold extraction and grading system according to claim 1, characterized in that, The capacity of the active culture tank is smaller than that of the preliminary oxidation tank.

3. The microbial oxidation gold extraction and grading system according to claim 1, characterized in that, The active culture tank is provided in multiple ways, and all of the active culture tanks are connected to the preliminary oxidation tank.

4. The microbial oxidation gold extraction and grading system according to claim 1, characterized in that, The preliminary oxidation tank has the same volume as the deep oxidation tank.

5. The microbial oxidation gold extraction and grading system according to claim 1, characterized in that, The active culture tank, the preliminary oxidation tank, and the deep oxidation tank each include: The tank is used to receive mineral slurry; An aeration component is disposed in the tank and is used to adjust the oxygen content in the tank. A temperature regulating component is disposed in the tank and is used to regulate the temperature in the tank. A stirring device, wherein the stirring end of the stirring device is placed inside the tank, is used to stir the slurry inside the tank.

6. The microbial oxidation gold extraction and grading system according to claim 5, characterized in that, The aeration assembly is located at the bottom of the tank.

7. The microbial oxidation gold extraction and grading system according to claim 6, characterized in that, The aeration component is provided with multiple air outlets, which are evenly arranged at the bottom of the tank.

8. The microbial oxidation gold extraction and grading system according to claim 5, characterized in that, The temperature regulating component includes a heat exchanger and a delivery pipe. The heat exchanger is disposed in the tank and is arranged along the height direction of the tank. The delivery pipe is connected to the heat exchanger and is used to deliver heat medium to the heat exchanger.

9. The microbial oxidation gold extraction and grading system according to claim 5, characterized in that, It also includes a control device, which is electrically connected to the stirring device and is used to control the stirring device.

10. The microbial oxidation gold extraction and grading system according to claim 5, characterized in that, The active culture tank, the preliminary oxidation tank, and the deep oxidation tank all include overflow pipes. The overflow pipes are used to connect the two tanks. One end of the overflow pipe is located at the upper liquid level of the tank, and the other end of the overflow pipe is connected to the other tank.

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