High-pressure acid leaching equipment

Abstract

The high-pressure acid leaching equipment comprises an autoclave and a discharging pipe, and the discharging pipe is connected to the autoclave and used for discharging materials in the autoclave. Anti-scaling layers are at least partially arranged on the inner wall of the autoclave and the inner wall of the discharge pipe, and the anti-scaling layers are made of high-molecular polymer materials. According to the high-pressure acid leaching equipment, the phenomenon of scaling in the autoclave can be relieved, and the influence of scaling on normal work of the autoclave is reduced. And moreover, the anti-scaling layers are arranged on the inner wall of the autoclave and the inner wall of the discharge pipe, so that the whole scaling period of the high-pressure acid leaching equipment is kept consistent, and unified cleaning is facilitated.

Description

Technical Field

[0001] The present application relates to the field of mineral processing technology, and in particular to a high-pressure acid leaching device. Background Art

[0002] In recent years, demand for nickel has been increasing. High-pressure acid leaching of laterite nickel ore has become the mainstream process for extracting nickel from the mineral. The combined annual production capacity of existing and under-construction high-pressure acid leaching plants for laterite nickel ore exceeds 800,000 tons of nickel. In high-pressure acid leaching equipment, most of the nickel and cobalt in the ore enters the solution, while impurities such as iron, silicon, and aluminum remain in the slag, achieving selective leaching of nickel and cobalt. During the high-pressure acid leaching process, the iron and aluminum in the laterite nickel ore form hematite and alum scale. These scales adhere to the inner walls of the autoclave and the discharge pipe, as well as coat the agitator blades, impacting the autoclave's continuous operation. For high-pressure acid leaching equipment processing laterite nickel ore with a high aluminum content, the autoclave typically needs to be shut down for descaling every two months, reducing the equipment's efficiency and restricting the nickel mining industry's production capacity. Utility Model Content

[0003] This application is made in view of the above-mentioned state of the prior art. The purpose of this application is to provide a high-pressure acid leaching device. The acid leaching device is provided with an anti-scaling layer, which can effectively alleviate the scaling phenomenon in the autoclave and reduce the impact of scaling on the normal operation of the autoclave.

[0004] The present application provides a high-pressure acid leaching device, which includes a pressure kettle and a discharge pipe, wherein the discharge pipe is connected to the pressure kettle and is used to discharge the material in the pressure kettle.

[0005] The inner wall of the autoclave and the inner wall of the discharge pipe are at least partially provided with an anti-scaling layer, and the anti-scaling layer is made of a high molecular polymer material.

[0006] In at least one possible embodiment, the high-pressure acid leaching equipment further comprises one or more stirrers, wherein the stirrers comprise a stirring shaft and a stirring paddle, wherein the stirring paddle is connected to the stirring shaft.

[0007] The anti-scaling layer is provided on the surface of the stirring paddle and / or the anti-scaling layer is provided at the connection between the stirring paddle and the stirring shaft.

[0008] In at least one possible embodiment, the high-pressure acid leaching equipment further includes one or more partitions, wherein the partitions are connected to the interior of the pressure vessel, and the anti-scaling layer is provided at the connection between the pressure vessel and the partitions.

[0009] In at least one possible embodiment, the inner wall of the autoclave is provided with a wear plate.

[0010] In at least one possible embodiment, a wear plate is provided in a projection area of the stirring paddle on the inner wall of the autoclave in a horizontal direction.

[0011] In at least one possible embodiment, at least a portion of the surface of the stirring paddle is provided with a hardened coating.

[0012] In at least one possible embodiment, the hardened coating is provided on the outer end of the blade of the stirring paddle.

[0013] In at least one possible embodiment, the anti-fouling layer is made of at least one of polytetrafluoroethylene, polyetheretherketone and perfluoroalkoxy; and / or,

[0014] The anti-scaling layer has a thickness of 1 to 3 mm.

[0015] In at least one possible embodiment, the wear plate is made of at least one of a titanium-nickel alloy and a titanium-molybdenum alloy; and / or,

[0016] The thickness of the wear plate is 2 to 6 mm.

[0017] In at least one possible embodiment, the material of the hardened coating is at least one of titanium dioxide, chromium oxide and titanium carbide; and / or,

[0018] The thickness of the hardened coating is 0.5 to 1 mm.

[0019] The high-pressure acid leaching equipment provided in the present application is provided with an anti-scaling layer on the inner wall of the pressure autoclave and the inner wall of the discharge pipe, which are prone to scaling. This not only alleviates the scaling phenomenon of the high-pressure acid leaching equipment and reduces the impact of scaling on the normal operation of the equipment, but also helps to make the overall scaling cycle of the high-pressure acid leaching equipment consistent, making it easier to clean uniformly. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic structural diagram of the acid leaching equipment according to one embodiment of the present application.

[0021] Figure 2 This is a structural schematic diagram of the acid leaching equipment from another perspective according to one embodiment of the present application.

[0022] Figure 3 Schematic diagram of the structure of an anti-fouling layer according to one embodiment of the present application.

[0023] Description of Reference Numerals

[0024] 11. Autoclave

[0025] 111 Anti-scaling layer

[0026] 12 partitions

[0027] 13 Manhole

[0028] 14 Baffle

[0029] 20 blender

[0030] 21 Motor

[0031] 22 stirring shaft

[0032] 23 stirring paddle

[0033] 30 Feed pipe

[0034] 40 discharge pipe DETAILED DESCRIPTION

[0035] The following describes exemplary embodiments of the present application with reference to the accompanying drawings. It should be understood that these specific descriptions are only used to teach those skilled in the art how to implement the present application, and are not intended to exhaust all possible embodiments of the present application, nor to limit the scope of the present application.

[0036] The embodiment of the present application provides a high pressure acid leaching device (hereinafter sometimes referred to as "acid leaching device"), such as Figure 1 and Figure 2 As shown, the acid leaching equipment may include a pressure vessel 11 , a stirrer 20 , a feed pipe 30 and a discharge pipe 40 .

[0037] Specifically, such as Figure 1 and Figure 2 As shown, the autoclave 11 may be a horizontal autoclave. The high pressure acid leaching equipment may further include a partition 12, a manhole 13 and a baffle 14. Figure 3 As shown, the inner wall of the autoclave 11 can be at least partially provided with an anti-scaling layer 111 to alleviate the scaling phenomenon of the acid leaching equipment. One or more partitions 12 can also be provided in the autoclave 11. The partitions 12 can be connected to the inner bottom surface of the autoclave 11 through a bracket. The partitions 12 can be perpendicular to the axial direction of the autoclave 11 (the axial direction of the autoclave is also the length direction of the horizontal autoclave, Figure 1 (X direction in the figure). Multiple partitions 12 can be arranged parallel to each other in the autoclave 11 to divide the interior of the autoclave 11 into multiple stirring zones. In this embodiment, four partitions are provided to separate five stirring zones. Passages such as gaps or through holes can be formed between the top and bottom of the partitions 12 and the inner wall of the autoclave 11. That is, the stirring zones on both sides of the partitions 12 can be connected, allowing material (e.g., mineral material) to flow through the multiple stirring zones within the autoclave 11.

[0038] like Figure 1 and Figure 2As shown, the autoclave 11 may also be provided with one or more inspection holes 13 for the purpose of inspecting the acid leaching equipment. The inspection holes 13 may be provided at the upper portion of the autoclave 11. The autoclave 11 may also be provided with one or more baffles 14. The baffles 14 may improve the main circulation, reduce adverse vortices, and thus enhance the stirring effect of the material (e.g., mineral material). For example, the baffles 14 may be provided in the longitudinal direction of the autoclave 11 (the axial direction of the autoclave, Figure 1 both ends of the X direction).

[0039] Preferably, the heights of the plurality of partitions 12 may be gradually decreased along the direction of material (eg, mineral material) flow (direction from the feed pipe to the discharge pipe) to enhance the fluidity of the material in the autoclave 11 .

[0040] like Figure 1 and Figure 2 As shown, the autoclave 11 can be connected to one or more agitators 20. For example, in this embodiment, a total of five agitators 20 are provided, i.e., one agitator 20 can be provided in each stirring area separated by the partition 12. The agitator 20 can include a motor 21, a stirring shaft 22, and a stirring paddle 23. The two ends of the stirring shaft 22 can be connected to the motor 21 and the stirring paddle 23, respectively. The surface of the stirring paddle 23 can also be at least partially provided with an anti-scaling layer.

[0041] The feed pipe 30 and the discharge pipe 40 can be respectively provided at both ends (axially) of the autoclave 11. For example, Figure 1 The feed pipe 30 may be disposed at the left end of the autoclave 11, and the discharge pipe 40 may be disposed at the right end of the autoclave 11. The main bodies of the feed pipe 30 and the discharge pipe 40 may be metal pipes.

[0042] Preferably, the anti-scaling layer 111 on the inner wall of the autoclave 11 can be provided at locations prone to scaling, such as slow material flow and dead zones in the autoclave 11. For example, the anti-scaling layer 111 can be provided at the connection between the partition 12 and the autoclave 11.

[0043] Preferably, the anti-scaling layer of the stirring paddle 23 may be provided at a portion of the stirring paddle 23 close to the stirring shaft 22 , that is, near the connection between the stirring paddle 23 and the stirring shaft 22 .

[0044] Preferably, the discharge pipe 40 may also be lined with an anti-scaling layer to prevent scaling on the discharge pipe 40 and facilitate smooth discharge of the material. Thus, the anti-scaling layer is provided on both the inner wall of the autoclave 11 and the inner wall of the discharge pipe 40, thereby reducing scaling during both the reaction and discharge processes of the high-pressure acid leaching equipment. This also helps maintain a consistent scaling cycle throughout the high-pressure acid leaching equipment, facilitating uniform cleaning.

[0045] Preferably, the anti-fouling layer can be made of a non-metallic polymer, such as polytetrafluoroethylene (PTFE), polyetheretherketone (PEEK), or perfluoroalkoxy (PFA). The anti-fouling layer can include one or more of the aforementioned non-metallic polymers. In particular, polytetrafluoroethylene (PTFE) can be used for the anti-fouling layer, as it has excellent high-temperature resistance, corrosion resistance, and anti-fouling properties.

[0046] Preferably, the anti-fouling layer may have a thickness of 1 to 3 mm.

[0047] It can be understood that the provision of an anti-scaling layer can effectively enhance the scale-repelling ability of areas of the acid leaching equipment that are prone to deposition, precipitation, and scale adhesion.

[0048] It is understood that the high-pressure acid leaching equipment provided in this embodiment can be applied to the high-pressure acid leaching production of nickel ore, especially the high-pressure acid leaching production of laterite nickel ore. The pressure vessel of the acid leaching equipment can be made of titanium alloy (including titanium-palladium alloy, etc.).

[0049] The inner wall of the autoclave 11 may also be provided with a wear plate to reduce wear of the inner wall of the autoclave 11 .

[0050] Preferably, the material of the wear plate can be titanium alloy such as titanium nickel alloy, titanium molybdenum alloy, etc. The thickness of the wear plate can be 2 to 6 mm. Preferably, the wear plate can be set on the inner wall of the autoclave 11 corresponding to the stirring paddle 23, that is, the stirring paddle 23 is in the horizontal direction ( Figure 2 The projection area of the autoclave 11 (in the Y direction) on the inner wall of the autoclave 11.

[0051] A hardened coating may also be formed on the surface of the stirring paddle 23 to reduce surface wear of the stirring paddle 23 .

[0052] Preferably, the hardened coating of the stirring paddle 23 can be provided in an area where the material flow rate is relatively high during operation. For example, the hardened coating of the stirring paddle 23 can be provided on the outer end of the blade of the stirring paddle 23. The hardened coating can be made of materials such as titanium dioxide, chromium trioxide, and titanium carbide. The thickness of the hardened coating can be 0.5 to 1 mm.

[0053] It can be understood that the provision of wear plates and hardened coatings can significantly enhance the wear resistance of the original wear-prone areas and scouring areas of the pickling equipment.

[0054] It is understood that the placement of the anti-scaling layer, anti-wear plate, and hardened coating within the pickling equipment can be designed and adjusted based on the flow field characteristics within the pickling equipment. The above exemplary arrangement does not limit the technical solution of this application. The aforementioned anti-scaling layer, anti-wear plate, and hardened coating can operate under high temperature and high pressure conditions for extended periods without causing wear and tear of the coating or lining.

[0055] For example, under a test condition of this embodiment, the period of shutting down and cleaning scale of the high-pressure acid leaching equipment can be extended from once every two months to once every six months.

[0056] Preferably, the working pressure of the acid leaching equipment can be 0.5 to 5.5 MPa (megapascals).

[0057] Preferably, the operating temperature of the pickling equipment can be 100 to 260 degrees Celsius.

[0058] The following briefly describes some of the beneficial effects of the above-mentioned embodiments of the present application.

[0059] The high-pressure acid leaching equipment provided in the embodiments of the present application can be provided with an anti-scaling layer on the inner wall of the autoclave, the stirring paddle, and the discharge pipe to alleviate the scaling phenomenon of the acid leaching equipment during production. It also helps to maintain a consistent overall scaling cycle of the high-pressure acid leaching equipment for easy unified cleaning. It can be provided with an anti-wear plate on the inner wall of the autoclave and a hardened coating on the stirring paddle to reduce equipment wear. The scaling and wear of this high-pressure acid leaching equipment are significantly improved compared to existing equipment, and can effectively reduce the impact of scaling and wear on equipment operation and reduce the frequency of equipment cleaning and maintenance. This allows the high-pressure acid leaching equipment to better achieve continuous production and improve its operating rate.

[0060] It is understood that in this application, when the number of parts or components is not specifically limited, the number may be one or more, and the term "plurality" herein refers to two or more. Where the number of parts or components is shown in the drawings and / or described in the specification as a specific number, such as two, three, or four, the specific number is generally illustrative and not restrictive, and may be understood as a plurality, i.e., two or more. However, this does not mean that this application excludes the case of one.

[0061] It should be understood that the above embodiments are merely exemplary and are not intended to limit the present application. Those skilled in the art may make various modifications and changes to the above embodiments based on the teachings of the present application without departing from the scope of the present application.

Claims

1. A high-pressure acid leaching equipment, characterized in that: It includes a pressure vessel and a discharge pipe, wherein the discharge pipe is connected to the pressure vessel and is used to discharge the material in the pressure vessel. The inner wall of the autoclave and the inner wall of the discharge pipe are at least partially provided with an anti-scaling layer, and the anti-scaling layer is made of a high molecular polymer material.

2. The high-pressure acid leaching equipment according to claim 1, characterized in that: Also included is one or more stirrers, each of which includes a stirring shaft and a stirring paddle connected to the stirring shaft. The anti-scaling layer is provided on the surface of the stirring paddle and / or the anti-scaling layer is provided at the connection between the stirring paddle and the stirring shaft.

3. The high-pressure acid leaching equipment according to claim 1, characterized in that: The autoclave further comprises one or more partitions connected to the interior of the autoclave, and the anti-scaling layer is provided at the connection between the autoclave and the partitions.

4. The high-pressure acid leaching equipment according to claim 1, characterized in that The inner wall of the autoclave is provided with a wear-resistant plate.

5. The high-pressure acid leaching equipment according to claim 2, characterized in that: The projection area of the stirring paddle on the inner wall of the autoclave in the horizontal direction is provided with a wear-proof plate.

6. The high-pressure acid leaching equipment according to claim 2, characterized in that: At least a portion of the surface of the stirring paddle is provided with a hardened coating.

7. The high-pressure acid leaching equipment according to claim 6, characterized in that: The outer end of the blade of the stirring paddle is provided with the hardened coating.

8. The high-pressure acid leaching equipment according to claim 1, characterized in that: The material of the anti-fouling layer is at least one of polytetrafluoroethylene, polyetheretherketone and perfluoroalkoxy; and / or, The anti-scaling layer has a thickness of 1 to 3 mm.

9. The high-pressure acid leaching equipment according to claim 4 or 5, characterized in that: The material of the wear plate is at least one of titanium-nickel alloy and titanium-molybdenum alloy; and / or, The thickness of the wear plate is 2 to 6 mm.

10. The high-pressure acid leaching equipment according to claim 6, characterized in that: The material of the hardened coating is at least one of titanium dioxide, chromium oxide and titanium carbide; and / or, The thickness of the hardened coating is 0.5 to 1 mm.

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