Classification blanking structure of molybdenum catalyst pressure leaching device

Abstract

The utility model belongs to the technical field of molybdenum resource recovery, particularly relates to a classified blanking structure of a molybdenum catalyst pressure leaching device, and aims to solve the problems of low recovery rate of molybdenum and increase of difficulty and cost of subsequent separation and purification in the background technology. A center feeding port is welded to the center of the outer wall of the top of the tank body, and annularly-distributed feeding ports are welded to the periphery of the tank body. According to the molybdenum selective leaching device, by arranging the center feeding port and the annularly-distributed feeding ports, classified feeding is achieved, impurity elements are prevented from being dissolved out too early, therefore, the molybdenum selective leaching efficiency is improved, the gas distribution pipes are in linkage with the feeding ports, the mass transfer efficiency of oxygen in leaching liquid is enhanced, and the leaching efficiency is improved. The conical disperser uniformly disperses materials into the tank body through a slope structure of the conical disperser, local accumulation is avoided, alkali liquor (such as a NaOH solution) is uniformly sprayed through a plurality of spray heads, and the spraying amount and the concentration of the alkali liquor can be conveniently adjusted according to the pH value and the molybdenum concentration of leachate monitored in real time.

Description

Technical Field

[0001] This utility model relates to the field of molybdenum resource recovery technology, and in particular to a classified feeding structure for a pressure leaching device for molybdenum-based catalysts. Background Technology

[0002] Traditional molybdenum recovery processes primarily employ the sodium roasting method, which converts molybdenum into soluble molybdates through high-temperature roasting, followed by leaching. However, this method suffers from high energy consumption and large emissions of waste gases (such as SO2 and NO3). - However, due to issues such as complex processes and difficulties in handling waste catalysts with complex compositions (containing multiple elements such as molybdenum, cobalt, iron, and phosphorus), pressure leaching technology has gradually become the mainstream process due to its advantages such as mild reaction conditions, low energy consumption, and environmental friendliness, in order to meet the increasing environmental protection requirements and the need for efficient resource utilization.

[0003] However, existing pressure leaching devices still have significant shortcomings in practical applications. First, the composition of spent catalysts is complex, and the leaching kinetics of different components vary considerably. Traditional single-inlet designs easily lead to uneven material distribution, causing localized over-leaching or incomplete reaction, thus affecting the selective leaching efficiency of molybdenum. Second, the gas-liquid-solid three-phase contact efficiency is low during leaching, and uneven oxygen distribution limits the reaction rate. Furthermore, traditional spray systems cannot dynamically adjust the alkali concentration and spray volume according to the leaching stage. Excessive alkalinity in the initial stage may cause co-dissolution of impurity elements (such as phosphorus and aluminum), while insufficient alkalinity in the later stage leads to incomplete molybdenum leaching. These problems not only reduce the molybdenum recovery rate but also increase the difficulty and cost of subsequent separation and purification. Utility Model Content

[0004] To address the shortcomings of existing technologies, this invention provides a classified feeding structure for a pressure leaching device for molybdenum-based catalysts. This structure overcomes the deficiencies of existing technologies and effectively solves the problems of low molybdenum recovery rate, which increases the difficulty and cost of subsequent separation and purification.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A classified feeding structure for a molybdenum-based catalyst pressure leaching device includes a tank body. A central feed inlet is welded to the center of the top outer wall of the tank body, and an annular distribution feed inlet is welded to the periphery of the tank body. A gas distributor is provided on the outer wall of the annular distribution feed inlet. The gas distributor includes a one-way valve and a gas distribution pipe. The one-way valve is fixedly connected to the bottom outer wall of the annular distribution feed inlet, and the gas distribution pipe is fixedly connected to the bottom outer wall of the one-way valve through a flange. A conical disperser is provided inside the tank body, and a liquid alkali spraying assembly is provided at the bottom of the conical disperser.

[0007] Preferably, the liquid alkali spraying assembly includes an annular spray pipe, a nozzle, a spray port, and an alkali input pipe. The annular spray pipe is welded to the bottom outer wall of the conical disperser, the nozzle is screwed to the bottom outer wall of the annular spray pipe, the spray port is welded to one side outer wall of the annular spray pipe and to the inner wall of the tank, and the alkali input pipe is fixedly connected to one end of the outer wall of the spray port via a flange.

[0008] Preferably, both the central feed inlet and the annular feed inlet have feed pipes fixedly connected to their outer walls via flanges.

[0009] Preferably, a heating jacket is welded to the outer wall of the tank, and a temperature controller with an electric heater is installed on the outer wall of the heating jacket. A water inlet pipe and a water outlet pipe are welded to the top and bottom of one side of the outer wall of the heating jacket, respectively.

[0010] Preferably, a stirring motor is provided at the bottom of the tank, and the output shaft of the stirring motor is fixedly connected to a stirring rod via a coupling, with stirring blades welded to the outer wall of the stirring rod.

[0011] Preferably, a motor base is fixedly connected to the bottom outer wall of the tank by screws, and the stirring motor is fixedly connected to the bottom outer wall of the motor base by screws.

[0012] Preferably, a drain pipe is welded to the inclined surface of the bottom outer wall of the tank, and a valve is installed on the outer wall of the drain pipe.

[0013] The beneficial effects of this utility model are as follows:

[0014] 1. The classified feeding structure of the molybdenum-based catalyst pressure leaching device in this design, by setting a central feed inlet and annular distribution feed inlets, respectively connected to catalyst storage bins of different compositions or particle sizes, realizes classified feeding, which can accurately control the addition ratio of different materials, avoid premature dissolution of impurity elements, thereby improving the selective leaching efficiency of molybdenum. In addition, the gas distribution pipe is linked with the feed inlet, and compressed air or oxygen is introduced at the same time as the material falls, which significantly increases the gas-liquid interface area and enhances the mass transfer efficiency of oxygen in the leachate.

[0015] 2. The molybdenum-based catalyst pressure leaching device designed in this project features a categorized feeding structure. A conical disperser, with its inclined surface, evenly disperses the material inside the tank, preventing localized accumulation and ensuring sufficient contact between molybdenum and the leaching agent. This reduces the generation of unreacted particles. Furthermore, an annular spray pipe is positioned at the bottom of the conical disperser, uniformly spraying alkaline solution (such as NaOH solution) through multiple nozzles. This allows for easy adjustment of the spray volume and alkaline concentration based on real-time monitoring of the leaching solution's pH and molybdenum concentration. For example, a high-concentration alkaline solution is used initially to rapidly establish the reaction environment, while the concentration is gradually reduced later to prevent impurities from dissolving. This dynamic adjustment mechanism further optimizes leaching selectivity. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the classification and feeding structure of a pressure leaching device for a molybdenum-based catalyst proposed in this utility model.

[0017] Figure 2 This is a schematic diagram of the internal structure of the tank of a pressure leaching device for molybdenum-based catalysts according to the present invention, showing the classified feeding structure.

[0018] Figure 3 This is a schematic diagram of part A of the classified feeding structure of a pressure leaching device for molybdenum-based catalysts proposed in this utility model.

[0019] Figure 4 This is a schematic diagram of the liquid alkali spraying component structure of a pressure leaching device for molybdenum-based catalysts, as proposed in this utility model.

[0020] In the diagram: 1. Tank body; 2. Central feed inlet; 3. Annular distribution feed inlet; 4. Gas distributor; 41. Check valve; 42. Gas distribution pipe; 5. Conical disperser; 6. Liquid alkali spray assembly; 61. Annular spray pipe; 62. Spray head; 63. Spray outlet; 64. Alkali input pipe; 7. Feed pipe; 8. Heating jacket; 9. Temperature controller; 10. Water inlet pipe; 11. Drain pipe; 12. Stirring motor; 13. Stirring rod; 14. Stirring blades; 15. Motor base; 16. Drain pipe; 17. Valve. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0022] Example 1, refer to Figures 1-3 A classified feeding structure for a molybdenum-based catalyst pressure leaching device includes a tank 1. A central feed inlet 2 is welded to the center of the top outer wall of the tank 1, and an annular distribution feed inlet 3 is welded to the periphery of the tank 1. A gas distributor 4 is provided on the outer wall of the annular distribution feed inlet 3. The gas distributor 4 includes a one-way valve 41 and a gas distribution pipe 42. The one-way valve 41 is fixedly connected to the bottom outer wall of the annular distribution feed inlet 3, and the gas distribution pipe 42 is fixedly connected to the bottom outer wall of the one-way valve 41 through a flange.

[0023] The central feed inlet 2 can be connected to the storage silo for the high-molybdenum-content catalyst via a flange, while the annular feed inlets 3 connect to the storage silo for the catalyst containing impurities. After entering the tank 1 through the feed pipe 7, the material first impacts the inclined surface of the conical disperser 5. The conical disperser 5 is designed with an inclination angle of 60° to ensure that the material is evenly dispersed to the bottom of the tank, preventing accumulation.

[0024] Example 2, refer to Figure 4 A classified feeding structure for a molybdenum-based catalyst pressure leaching device is disclosed. The tank body 1 contains a conical disperser 5, and a liquid alkali spraying assembly 6 is located at the bottom of the conical disperser 5. The liquid alkali spraying assembly 6 includes an annular spray pipe 61, a nozzle 62, a spray port 63, and an alkali inlet pipe 64. The annular spray pipe 61 is welded to the bottom outer wall of the conical disperser 5. The nozzle 62 is screwed to the bottom outer wall of the annular spray pipe 61. The spray port 63 is welded to one side of the outer wall of the annular spray pipe 61 and also welded to the inner wall of the tank body 1. The alkali inlet pipe 64 is fixedly connected to one end of the outer wall of the spray port 63 via a flange.

[0025] A gas distributor 4 is installed on the outer wall of the annular feed inlet 3, and its gas distribution pipe 42 is connected to an external gas source via a flange. The gas, passing through the gas distribution pipe 42, forms microbubbles with a diameter of less than 1 mm, which are evenly distributed along the material's falling path. Simultaneously, the annular spray pipe 61 of the liquid alkali spray assembly 6 is welded to the bottom of the conical disperser 5. The nozzle 62 uses a fan-shaped nozzle with a spray angle of 90° to ensure that the alkali solution covers the entire reaction area. The alkali solution input pipe 64 can be equipped with a flow meter and an electric regulating valve, allowing real-time control of the spray volume via a PLC system.

[0026] Reference Figures 1-2 Both the central feed inlet 2 and the annular distributed feed inlet 3 have feed pipes 7 fixedly connected to their outer walls via flanges.

[0027] Reference Figure 1 A heating jacket 8 is welded to the outer wall of the tank body 1, and a temperature controller 9 with an electric heater is installed on the outer wall of the heating jacket 8. A water inlet pipe 10 and a drain pipe 11 are welded to the top and bottom of one side of the outer wall of the heating jacket 8, respectively. A stirring motor 12 is provided at the bottom of the tank body 1, and a stirring rod 13 is fixedly connected to the output shaft of the stirring motor 12 through a coupling. A stirring blade 14 is welded to the outer wall of the stirring rod 13.

[0028] A heating jacket 8 is welded to the outer wall of the tank body 1, and hot water is circulated inside the jacket. The temperature is precisely controlled by a thermostat 9. The stirring motor 12 drives the stirring rod 13 through a coupling. The stirring blades 14 are double-layer turbine type, which breaks up agglomerated particles.

[0029] Reference Figure 2 The bottom outer wall of the tank 1 is fixedly connected to a motor base 15 by screws, and the stirring motor 12 is fixedly connected to the bottom outer wall of the motor base 15 by screws.

[0030] Reference Figure 2 A drain pipe 16 is welded to the inclined surface of the bottom outer wall of the tank body 1, and a valve 17 is installed on the outer wall of the drain pipe 16.

[0031] Working principle:

[0032] 1. Categorized feeding and dispersion:

[0033] After being sorted by composition or particle size, the spent catalyst enters tank 1 through the central feed inlet 2 and the annular distribution feed inlet 3, respectively. The PLC system controls the opening of each feed inlet according to a preset program. For example, high-molybdenum materials are preferentially added at 80% flow rate, while impurities are added in stages. The materials are uniformly dispersed by the conical disperser 5, forming a thin layer that falls.

[0034] 2. Gas-liquid synergistic leaching:

[0035] During the material's descent, oxygen is introduced through gas distributor 4, creating a microbubble flow. These bubbles contact the material surface, promoting the oxidation reaction of molybdenum (e.g., MoS2 → MoO4). 2- Simultaneously, the annular spray pipe 61 sprays alkaline solution, with the initial pH value controlled at 10-12, to dissolve molybdenum oxide.

[0036] 3. Temperature control and enhanced stirring:

[0037] The heating jacket 8 maintains the reaction temperature at 85℃, and the stirring blades 14 operate at 120 rpm to break up particle agglomeration and ensure uniform mass transfer. The leachate is discharged through the drain pipe 16 and can directly enter the subsequent precipitation process.

[0038] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A classification and discharging structure of a molybdenum series catalyst pressure leaching device, comprising a tank body (1), characterized in that, The center of the top outer wall of the tank body (1) is welded with a center feed inlet (2), and the periphery of the tank body (1) is welded with an annular distribution feed inlet (3), the outer wall of the annular distribution feed inlet (3) is provided with a gas distributor (4), the gas distributor (4) comprises a one-way valve (41) and a gas distribution pipe (42), wherein the one-way valve (41) is fixedly connected to the bottom outer wall of the annular distribution feed inlet (3), and the gas distribution pipe (42) is fixedly connected to the bottom outer wall of the one-way valve (41) through a flange, and the inside of the tank body (1) is provided with a conical disperser (5), and the bottom of the conical disperser (5) is provided with a liquid alkali spraying assembly (6).

2. The classification and discharging structure of a molybdenum catalyst pressure leaching device according to claim 1, characterized in that, The liquid alkali spraying assembly (6) comprises an annular spraying pipe (61), a spray head (62), a spraying port (63) and an alkali liquid input pipe (64), wherein the annular spraying pipe (61) is welded to the bottom outer wall of the conical disperser (5), the spray head (62) is screwed to the bottom outer wall of the annular spraying pipe (61), the spraying port (63) is welded to one side of the outer wall of the annular spraying pipe (61), and the spraying port (63) is welded to the inner wall of the tank body (1), and the alkali liquid input pipe (64) is fixedly connected to one end of the outer wall of the spraying port (63) through a flange.

3. The classification and discharging structure of a molybdenum catalyst pressure leaching device according to claim 1, characterized in that, The center feed inlet (2) and one end of the outer wall of the annular distribution feed inlet (3) are fixedly connected with a feed pipe (7) through a flange.

4. The classification and discharging structure of a molybdenum catalyst pressure leaching device according to claim 1, characterized in that, A heating jacket (8) is welded to the outer wall of the tank body (1), a temperature controller (9) with an electric heater is installed on the outer wall of the heating jacket (8), and a water inlet pipe (10) and a drain pipe (11) are welded to the top and bottom of one side of the outer wall of the heating jacket (8), respectively.

5. The classification and dosing structure of a molybdenum catalyst pressure leaching device according to claim 1, characterized in that, A stirring motor (12) is arranged at the bottom of the tank body (1), and the output shaft of the stirring motor (12) is fixedly connected with a stirring rod (13) through a shaft coupling, and stirring blades (14) are welded to the outer wall of the stirring rod (13).

6. The classification and dosing structure of a molybdenum catalyst pressure leaching device according to claim 1, characterized in that, The bottom outer wall of the tank body (1) is fixedly connected with a motor base (15) through screws, and the stirring motor (12) is fixedly connected to the bottom outer wall of the motor base (15) through screws.

7. The classification and dosing structure of a molybdenum catalyst pressure leaching device according to claim 1, characterized in that, A drain pipe (16) is welded to the inclined surface of the bottom outer wall of the tank body (1), and a valve (17) is installed on the outer wall of the drain pipe (16).

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