Oxygen pressure leaching system

Abstract

The utility model provides an oxygen pressure leaching system. The oxygen pressure leaching system comprises an oxygen pressure kettle, a flash tank and a washing tower. The oxygen pressure kettle is connected with the flash tank through a discharging pipeline, so that materials in the oxygen pressure kettle are introduced into the flash tank. An exhaust port of the oxygen pressure kettle and an exhaust port of the flash tank are both connected to the washing tower so as to treat waste gas generated by the oxygen pressure kettle and the flash tank. The washing tower is used for treating waste gas formed in the oxygen pressure kettle and the flash tank at the same time, compared with a waste gas treatment device which is independently arranged, the equipment and labor cost can be reduced, and the occupied space of the oxygen pressure leaching system is reduced.

Description

Technical Field

[0001] This application relates to the field of hydrometallurgical technology, and in particular to an oxygen pressure leaching system. Background Technology

[0002] As ore grades decrease, traditional hydrometallurgical systems face problems such as insufficient metal utilization, high energy consumption, and severe environmental pollution. Particularly in the leaching stage of hydrometallurgy, traditional systems suffer from low leaching efficiency, slow reaction rates, low precision in reaction preheating and cooling control, and difficulty in treating exhaust gases.

[0003] Waste gases, especially acidic waste gases, can be generated at multiple stages in hydrometallurgical systems. Effectively treating these acidic waste gases while minimizing treatment costs is a critical technical challenge that urgently needs to be addressed in hydrometallurgical processes. Utility Model Content

[0004] This application is made in view of the aforementioned state of the prior art. The purpose of this application is to provide an oxygen pressure leaching system capable of effectively treating waste gas generated by an oxygen pressure reactor and a flash tank.

[0005] This application provides an oxygen pressure leaching system, which includes an oxygen pressure vessel, a flash tank, and a washing tower.

[0006] The oxygen pressure vessel is connected to the flash tank via a discharge pipeline to allow the material in the oxygen pressure vessel to be introduced into the flash tank.

[0007] The exhaust ports of the oxygen pressure vessel and the flash tank are both connected to the scrubbing tower to treat the waste gas generated by the oxygen pressure vessel and the flash tank.

[0008] In at least one possible implementation, the scrubbing tower is a Venturi scrubbing tower, which includes a Venturi tube and an alkali tank.

[0009] The venturi tube allows circulating water to flow through it, and the circulating water flowing through the venturi tube generates negative pressure to draw in waste gas.

[0010] The alkaline solution tank is capable of purging alkaline solution, which can react with the waste gas to treat it.

[0011] In at least one possible implementation, the oxygen autoclave is equipped with a coil heat exchanger.

[0012] The coil heat exchanger includes a steam-condensate flow path to heat the material inside the oxygen autoclave using steam; and / or,

[0013] The coil heat exchanger also includes a circulating water path to cool the material inside the oxygen pressure vessel using the circulating water flow.

[0014] In at least one possible implementation, the oxygen pressure leaching system further includes a liquid oxygen pipeline connected to the oxygen pressure vessel to introduce liquid oxygen and a coolant into the vessel, the coolant being capable of reducing the material temperature inside the vessel.

[0015] In at least one possible embodiment, the oxygen pressure leaching system further includes a liquid oxygen pipeline connected to the oxygen pressure vessel to introduce liquid oxygen into the vessel.

[0016] The liquid oxygen pipeline is sequentially equipped with a centrifugal pump and a diaphragm pump to provide flow power to the liquid oxygen; and / or

[0017] The oxygen pressure leaching system also includes a feed pipeline for introducing slurry into the oxygen pressure vessel.

[0018] The feed pipeline is equipped with a centrifugal pump and a diaphragm pump to provide flow power to the slurry.

[0019] A filter is installed upstream of the diaphragm pump to filter out impurities in the slurry.

[0020] In at least one possible implementation, the flash tank includes a flash valve disposed at the top of the flash tank to allow material to be introduced into the flash tank from the top.

[0021] In at least one possible implementation, the oxygen autoclave has a slurry inlet, a liquid oxygen inlet, and a slurry outlet.

[0022] At least one of the slurry inlet, the liquid oxygen inlet, the exhaust port, and the slurry outlet has an inner tube extending into the interior of the oxygen pressure vessel.

[0023] In at least one possible implementation, a polytetrafluoroethylene (PTFE) liner is formed on the inner surface of the inner tube to improve the service life of the inner tube; and / or,

[0024] The inner extension tube is a bent pipe, which can improve the stirring efficiency of the oxygen pressure vessel.

[0025] In at least one possible implementation, the oxygen pressure vessel is provided with a replenishment system, which includes a liquid level monitoring device for monitoring the liquid level of the material in the oxygen pressure vessel so that the replenishment system can replenish the material in the oxygen pressure vessel in a timely manner.

[0026] In at least one possible implementation, at least a portion of the discharge pipeline is a segmented pipeline to facilitate maintenance of the discharge pipeline.

[0027] The oxygen pressure leaching system provided in this application can treat the waste gas, especially acidic waste gas, generated during the oxygen pressure leaching process in the oxygen pressure reactor and flash tank via a scrubbing tower connected to both. Treating the waste gas from the oxygen pressure reactor and flash tank simultaneously with a single waste gas treatment device reduces equipment and labor costs and minimizes equipment space requirements compared to installing separate waste gas treatment devices. Furthermore, treating the waste gas from both the oxygen pressure reactor and flash tank in the same scrubbing tower can relatively reduce the resources consumed in waste gas treatment; for example, it can reduce the total amount of circulating water required for the Venturi scrubbing tower to absorb the waste gas. Attached Figure Description

[0028] Figure 1 This is a simplified structural diagram of an oxygen pressure leaching system according to one embodiment of this application.

[0029] Explanation of reference numerals in the attached figures

[0030] 10 Oxygen Pressure Vessel

[0031] 11. Coil-type heat exchanger

[0032] 12. Stirring device

[0033] 20 Feed pipe

[0034] 21 First centrifugal pump

[0035] 22 First Diaphragm Pump

[0036] 30 Discharge Pipeline

[0037] 41 Flash evaporator

[0038] 42 Adjustment groove

[0039] 50 Washing Towers

[0040] 60 Liquid oxygen pipeline

[0041] 61 Second centrifugal pump

[0042] 62 Second diaphragm pump Detailed Implementation

[0043] Exemplary embodiments of this application are described below with reference to the accompanying drawings. It should be understood that these specific descriptions are for teaching those skilled in the art how to implement this application only, and are not intended to exhaustively describe all possible methods of this application, nor to limit the scope of this application.

[0044] Embodiments of this application provide an oxygen pressure leaching system, such as Figure 1 As shown, the oxygen pressure leaching system may include an oxygen pressure vessel 10, a flash tank 41, and a scrubbing tower 50.

[0045] After the slurry material (especially high-grade nickel matte slurry) enters the oxygen autoclave 10, it can react with oxygen within the autoclave 10 to leach non-ferrous metals (such as nickel and copper) from the slurry. The oxygen autoclave 10 can have a slurry inlet, a liquid oxygen inlet, an exhaust port, and a slurry outlet. The slurry inlet, liquid oxygen inlet, exhaust port, and slurry outlet (especially the slurry inlet and liquid oxygen inlet) can all be equipped with internal extension pipes extending into the interior of the autoclave to facilitate better introduction and discharge of various materials. The inner surface of the internal extension pipe can be lined with a polytetrafluoroethylene (PTFE) layer. The PTFE lining can reduce corrosion and wear of the internal extension pipe and reduce scaling, thereby extending its service life. Furthermore, the internal extension pipe can be a bent pipe. It is understood that the internal extension pipe extending into the interior of the oxygen autoclave 10 can reach below the material liquid surface during material injection operations, and its pipe structure can affect the flow field during material agitation. The bending angle and direction of the inner tube are designed according to actual production needs, which can optimize the liquid flow field inside the oxygen pressure vessel 10 and thus improve the production efficiency of the oxygen pressure vessel 10.

[0046] Automatic shut-off valves can be installed at the slurry inlet, liquid oxygen inlet, exhaust port, and slurry outlet to control the opening and closing status of the relevant openings, thereby controlling the process of various materials entering or leaving the outlet.

[0047] Furthermore, both the slurry inlet and outlet of the oxygen autoclave 10 can be located at the upper part of the oxygen autoclave 10. For example, in... Figure 1 In the process, the slurry inlet can be located on the upper left side of the oxygen pressure vessel 10, and the slurry outlet can be located on the upper right side of the oxygen pressure vessel 10.

[0048] The feed line 20 can be connected to the slurry inlet of the oxygen pressure vessel 10 for introducing slurry into the oxygen pressure vessel 10. A first centrifugal pump 21 and a first diaphragm pump 22 can be installed on the feed line 20 to provide the flow power for the slurry. A filter can be installed upstream of the first diaphragm pump 22 to filter out large particles in the slurry and prevent large particles in the slurry from damaging the diaphragm pump.

[0049] The liquid oxygen pipeline 60 can be connected to the liquid oxygen inlet of the oxygen pressure vessel 10 for introducing liquid oxygen into the oxygen pressure vessel 10. A second centrifugal pump 61 and a second diaphragm pump 62 can be installed on the liquid oxygen pipeline 60 to provide the flow power for the liquid oxygen.

[0050] Preferably, the liquid oxygen pipeline 60 can also be used to introduce coolant. It is understood that since liquid oxygen has a low temperature, the coolant can be mixed with the liquid oxygen and simultaneously introduced into the oxygen pressure vessel 10 to cool the material inside the oxygen pressure vessel 10 while oxygen is being introduced into it. Alternatively, liquid oxygen and coolant can be introduced into the oxygen pressure vessel 10 separately via the liquid oxygen pipeline 60.

[0051] The first diaphragm pump 22 and / or the second diaphragm pump 62 may also be equipped with an outlet buffer, which can be used to reduce pump outlet pulsation and pressure shock to protect the safe operation of pipelines and equipment.

[0052] The discharge pipe 30 can be connected to the slurry outlet of the oxygen pressure vessel 10 for discharging the material inside the oxygen pressure vessel 10. At least a portion of the discharge pipe 30 can be a segmented pipe. Segmented pipes allow for partial replacement when certain sections require repair or replacement (e.g., due to scaling, corrosion, etc.). It is understood that segmenting the pipe requiring repair, disassembly, and cleaning, compared to performing a single operation on the entire pipe, saves equipment costs and reduces maintenance difficulty.

[0053] The oxygen pressure vessel 10 may be equipped with one or more stirring devices 12. Preferably, the oxygen pressure vessel 10 may form one or more compartments (the compartments may be formed by one or more partitions disposed within the oxygen pressure vessel), and each compartment may be equipped with one stirring device 12. For example, the oxygen pressure vessel 10 may include five compartments. The stirring device 12 may be disposed in the middle of the compartment to improve the stirring effect of the stirring device 12.

[0054] The stirring device 12 may include a stirring paddle, a stirring shaft, a stirring motor, a speed reducer, and a sealing structure. During the leaching operation in the oxygen pressure vessel 10, the stirring device 12 can maintain the material particles (slurry particles) in a suspended state in the fluid to facilitate the reaction of the material particles. At the same time, the stirring device 12 can also disperse the liquid oxygen introduced into the oxygen pressure vessel 10. The liquid oxygen can be dispersed and vaporized under the stirring of the stirring device 12, promoting its reaction with the slurry particles.

[0055] It is understood that the liquid oxygen inlet of the oxygen pressure vessel 10 can be equipped with the aforementioned inner extension pipe. After the liquid oxygen is introduced into the material through the inner extension pipe of the liquid oxygen inlet, it can be dispersed and vaporized in the material under the action of the stirring device 12. This structure can improve the dispersion effect of oxygen and the utilization rate of oxygen, thereby improving the overall production efficiency of the oxygen pressure leaching system.

[0056] The oxygen pressure vessel 10 may be equipped with a coiled heat exchanger 11. The coiled heat exchanger 11 may have a steam-condensate flow path for heating and a circulating water flow path for cooling. The steam-condensate flow path and the circulating water flow path may use the same piping, or they may use different piping (i.e., a dual-coil heat exchanger). It is understood that introducing steam into the coiled heat exchanger 11 can preheat the oxygen pressure vessel 10 and / or heat the material inside the oxygen pressure vessel 10. After cooling, the steam forms condensate that flows out. The circulating water flow can remove heat from the oxygen pressure vessel 10 to cool the material inside the oxygen pressure vessel 10 (and / or the oxygen pressure vessel itself).

[0057] Preferably, the oxygen pressure leaching system can simultaneously include both circulating water cooling of the coil heat exchanger 11 and coolant cooling of the liquid oxygen pipeline 60 to improve the cooling efficiency and control accuracy of the oxygen pressure leaching system. It is understood that in some cases, the oxygen pressure leaching system may also only employ one of the cooling methods: circulating water cooling of the coil heat exchanger 11 and coolant cooling of the liquid oxygen pipeline 60. That is, the coil heat exchanger 11 may only include a steam-condensate flow path for heating, or the liquid oxygen pipeline 60 may only be used for introducing liquid oxygen.

[0058] The oxygen pressure vessel 10 and the pipelines connected to it can be made of titanium alloy, such as titanium-nickel alloy.

[0059] The slurry outlet of the oxygen pressure vessel 10 can be connected to the flash tank 41 via the discharge pipe 30, and the flash tank 41 can be further connected to the regulating tank 42. The slurry material can enter the flash tank 41 for cooling and depressurization. The flash liquid (cooled slurry material) generated in this process can be temporarily stored in the downstream regulating tank 42 and can continue to be fed into the equipment of the next process. The tail gas (waste gas) generated in the flash process can be fed into the scrubbing tower 50 for treatment.

[0060] The flash tank 41 can be made primarily of titanium composite plate. The flash tank 41 may include a flash valve, which can be located at the top of the flash tank 41, allowing the slurry material to enter the flash tank 41 through the top-mounted flash valve; that is, the flash tank 41 can employ a top-flash process. Compared to the lateral flash process where the flash valve is located on the side of the flash tank, the top-flash process provides a wider operating temperature and pressure range.

[0061] Both the exhaust ports of the oxygen autoclave 10 and the flash tank 41 can be connected to the scrubbing tower 50 via pipelines. Treating the waste gas from both the oxygen autoclave and flash tank simultaneously with a single scrubbing tower reduces equipment and labor costs, minimizes equipment space requirements, and relatively reduces the resources consumed in treating the waste gas. The scrubbing tower 50 can be a Venturi scrubbing tower, meaning it can include a Venturi tube. When fluid flows through the Venturi tube, a negative pressure is created to draw in the waste gas from the oxygen autoclave 10 and flash tank 41. Furthermore, the fluid flowing through the Venturi tube can be circulating water; in particular, wastewater from other processes can be used as circulating water to achieve waste utilization and resource conservation. Moreover, treating the waste gas from both the oxygen autoclave 10 and flash tank 41 through the same Venturi scrubbing tower can relatively reduce the total amount of circulating water consumed in waste gas treatment.

[0062] The scrubbing tower 50 may include an alkali tank, through which alkali solution is introduced to react with the waste gas (mainly acidic waste gas) from the oxygen pressure leaching reactor 10 and flash tank 41 to treat harmful substances in the waste gas. After treatment, the waste gas meets emission standards and can be released into the air, or it can be reused in other processes as needed. The scrubbing tower allows for unified treatment of waste gas generated in the oxygen pressure leaching reactor and flash tank, reducing or eliminating waste gas pollution from the oxygen pressure leaching process. Furthermore, the scrubbing tower can utilize wastewater from other processes as circulating water to create negative pressure in the venturi tubes, further reducing energy consumption and environmental pollution in the oxygen pressure leaching process.

[0063] The scrubbing tower 50 may also have a buffer tank. After the exhaust gas is discharged from the venturi tube, it may expand in volume. The buffer tank can temporarily contain the exhaust gas discharged from the venturi tube to provide space to buffer the volume change of the exhaust gas.

[0064] It is understandable that the circulating water flowing into the coil heat exchanger 11 and the circulating water flowing into the scrubbing tower 50 (the venturi tube of the scrubbing tower) can come from different sources. To prevent corrosion, scaling, and other damage to the coil heat exchanger 11, the circulating water flowing into it should meet certain requirements regarding cleanliness and pH levels. However, the circulating water flowing into the venturi tube of the scrubbing tower 50 has relatively lower requirements for water quality and pH levels, and its source selection is more flexible.

[0065] The oxygen autoclave can also be equipped with a liquid replenishment system, which may include a liquid level monitoring device. The liquid level monitoring device can be installed on the wall of the oxygen autoclave. The liquid level monitoring device can monitor the liquid level of the material inside the oxygen autoclave 10 in real time, and then feed the liquid level information back to the liquid replenishment system, enabling the liquid replenishment system to replenish the oxygen autoclave in a timely manner (controlling each material pipeline). The liquid replenishment system can maintain a stable liquid level and pressure inside the oxygen autoclave, allowing the oxygen autoclave to maintain high production efficiency.

[0066] The following is a brief description of some of the beneficial effects of the above-described embodiments of this application.

[0067] The oxygen pressure leaching system provided in this application treats the waste gas, particularly acidic waste gas, generated during oxygen pressure leaching production from the oxygen pressure reactor and flash tank via a scrubbing tower connected to both. Compared to separate waste gas treatment devices, using a single waste gas treatment unit to treat the waste gas from both the oxygen pressure reactor and flash tank reduces equipment and labor costs and space requirements. Furthermore, treating the waste gas from both the oxygen pressure reactor and flash tank through the same scrubbing tower relatively reduces the resources consumed in waste gas treatment. The scrubbing tower can be a Venturi scrubbing tower, which utilizes the negative pressure generated when circulating water flows through the Venturi tube to absorb the waste gas, allowing it to react with the alkaline solution. The circulating water flowing into the Venturi tube can be industrial wastewater from other processes, further reducing waste gas treatment costs. This oxygen pressure leaching system can also simultaneously employ two cooling methods: circulating water cooling of the coil heat exchanger and coolant cooling of the liquid oxygen pipeline, to improve the cooling efficiency and control accuracy of the oxygen pressure leaching system.

[0068] It is understood that, in this application, when the number of parts or components is not specifically limited, the number can be one or more, where multiple refers to two or more. For cases where the number of parts or components shown in the drawings and / or described in the specification is, for example, two, three, four, etc., this specific number is generally exemplary and not restrictive, and can be understood as multiple, i.e., two or more; however, this does not mean that this application excludes the case of one.

[0069] It should be understood that the above embodiments are merely exemplary and are not intended to limit this application. Those skilled in the art can make various modifications and changes to the above embodiments under the teachings of this application without departing from the scope of this application.

Claims

1. An oxygen pressure leaching system, characterized in that, Includes oxygen autoclave, flash tank, and scrubbing tower. The oxygen pressure vessel is connected to the flash tank via a discharge pipeline to allow the material in the oxygen pressure vessel to be introduced into the flash tank. The exhaust ports of the oxygen pressure vessel and the flash tank are both connected to the scrubbing tower to treat the waste gas generated by the oxygen pressure vessel and the flash tank.

2. The oxygen pressure leaching system according to claim 1, characterized in that, The washing tower is a Venturi-type washing tower, which includes a Venturi tube and an alkali tank. The venturi tube allows circulating water to flow through it, and the circulating water flowing through the venturi tube generates negative pressure to draw in waste gas. The alkaline solution tank is capable of purging alkaline solution, which can react with the waste gas to treat it.

3. The oxygen pressure leaching system according to claim 1, characterized in that, The oxygen pressure vessel is equipped with a coil heat exchanger. The coil heat exchanger includes a steam-condensate flow path to heat the material inside the oxygen pressure vessel using steam; and / or, the coil heat exchanger includes a circulating water flow path to cool the material inside the oxygen pressure vessel using circulating water.

4. The oxygen pressure leaching system according to claim 1, characterized in that, It also includes a liquid oxygen pipeline connected to the oxygen pressure vessel to introduce liquid oxygen and coolant into the oxygen pressure vessel, the coolant being able to reduce the temperature of the material inside the oxygen pressure vessel.

5. The oxygen pressure leaching system according to claim 1, characterized in that, It also includes a liquid oxygen pipeline connected to the oxygen pressure vessel to introduce liquid oxygen into the vessel. The liquid oxygen pipeline is sequentially equipped with a centrifugal pump and a diaphragm pump to provide flow power to the liquid oxygen; and / or The oxygen pressure leaching system also includes a feed pipeline for introducing slurry into the oxygen pressure vessel. The feed pipeline is equipped with a centrifugal pump and a diaphragm pump to provide flow power to the slurry. A filter is installed upstream of the diaphragm pump to filter out impurities in the slurry.

6. The oxygen pressure leaching system according to claim 1, characterized in that, The flash tank includes a flash valve located at the top of the flash tank to allow material to enter the flash tank from the top.

7. The oxygen pressure leaching system according to claim 1, characterized in that, The oxygen autoclave has a slurry inlet, a liquid oxygen inlet, and a slurry outlet. At least one of the slurry inlet, the liquid oxygen inlet, the exhaust port, and the slurry outlet has an inner tube extending into the interior of the oxygen pressure vessel.

8. The oxygen pressure leaching system according to claim 7, characterized in that, The inner surface of the inner tube is formed with a polytetrafluoroethylene liner to improve the service life of the inner tube; and / or, The inner extension tube is a bent pipe, which can improve the stirring efficiency of the oxygen pressure vessel.

9. The oxygen pressure leaching system according to claim 1, characterized in that, The oxygen pressure vessel is equipped with a liquid replenishment system, which includes a liquid level monitoring device. The liquid level monitoring device is used to monitor the liquid level of the material in the oxygen pressure vessel so that the liquid replenishment system can replenish the material in the oxygen pressure vessel in a timely manner.

10. The oxygen pressure leaching system according to claim 1, characterized in that, At least a portion of the discharge pipeline is a segmented pipeline to facilitate maintenance of the discharge pipeline.

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