A kind of filter pressing system for reducing washable molybdenum content of molybdenum slag

Abstract

The utility model provides a kind of to reduce the pressure filtration system of washable molybdenum content of molybdenum residue, it is specifically related to pressure filtration system technical field, to solve the technical problem that ideal molybdenum elution effect cannot be achieved in the water washing stage due to poor permeability of mud cake in prior art.The device includes at least two full-automatic plate-and-frame filter presses arranged in parallel, the full-automatic plate-and-frame filter presses include a first filter press and a second filter press connected in series along the material path, the feed inlet of the first filter press is connected to the end of the feed system, the discharge outlet of the first filter press is provided with a sizing tank, and the discharge pipe of the sizing tank is connected to the feed inlet of the second filter press after passing through a second centrifugal pump and a second pneumatic valve; a receiving tank is arranged below the discharge outlet of the second filter press; and the feed inlet of the first filter press is connected in parallel to the end of the water washing system.The device realizes deep reduction of washable molybdenum content in molybdenum residue and fully-automatic operation of the pressure filtration process through combination of structural design and process optimization, and the technical effect is significantly better than that of the conventional process.

Description

Technical Field

[0001] This utility model relates to the field of filter press system technology, and more specifically, to a filter press system for reducing the washable molybdenum content in molybdenum slag. Background Technology

[0002] In the industrial production process of extracting molybdenum from molybdenum calcined sand, pressure filtration of the molybdenum-containing solution is a crucial step in removing impurities. Current conventional processes require multiple pressure filtrations of the molybdenum-containing solution. However, during this process, a large amount of molybdenum remains in the molybdenum slag, and the filtrate drips directly into the receiving tank below, resulting in waste. To reduce the washable molybdenum content in the slag, traditional processes typically involve multiple online washings of the filter cake after filtration. However, this method has significant technical drawbacks: when the filter cake structure is dense and thick, the washing water cannot penetrate the surface for deep cleaning, leading to extremely poor washing results and ultimately, a persistently high washable molybdenum content in the slag.

[0003] Furthermore, existing filter press systems suffer from significant shortcomings in process continuity and automation. Unloading, receiving, and transfer processes rely on manual intervention, increasing labor intensity and hindering full-process automation, severely restricting production efficiency. For example, the traditional filter press process employs a "plate assembly - feeding - pressure holding - multiple air blowing - multiple water washing - plate opening and unloading" flow. During the water washing stage, the poor permeability of the filter cake prevents the achievement of ideal molybdenum elution. Experimental data shows that the washable molybdenum content in the molybdenum slag obtained using traditional online washing processes is generally higher than 0.5%, with low filtrate recovery rates and numerous manual operation steps, failing to meet the requirements of modern industrial production for high efficiency, energy saving, and automation. Utility Model Content

[0004] The purpose of this invention is to provide a filter press system that reduces the washable molybdenum content in molybdenum slag, thereby reducing the washable molybdenum content in the slag, improving the filtrate recovery rate, and simultaneously achieving fully automated continuous production.

[0005] The embodiments of this utility model are achieved through the following technical solutions: A filter press system for reducing the washable molybdenum content in molybdenum slag includes at least two fully automatic plate and frame filter presses arranged in parallel. Each fully automatic plate and frame filter press includes a first filter press and a second filter press connected in series along a material path. The inlet of the first filter press is connected to the end of a feeding system. The outlet of the first filter press is equipped with a slurry conditioning tank. The outlet pipe of the slurry conditioning tank is connected to the inlet of the second filter press via a second centrifugal pump and a second pneumatic valve. A receiving tank is located below the outlet of the second filter press. The inlet of the first filter press is connected in parallel to the end of a water washing system.

[0006] In some embodiments, both the first and second filter presses are hinged to horizontal plate-shaped liquid receiving flap devices below their outlets. Each of the two liquid receiving flap devices has an inclined guide channel connected to the filtrate tank via a pipeline. Each of the two liquid receiving flap devices has an inverted conical receiving funnel below it. The inverted conical receiving funnel below the first filter press is connected to the slurry conditioning tank.

[0007] In some embodiments, the slurry preparation tank is cylindrical, with its top opening connected to the discharge port of the first filter press via an inverted conical receiving funnel. A stirring shaft is vertically installed inside the slurry preparation tank, and the top of the stirring shaft is connected to a stirring motor fixed to the top support of the slurry preparation tank. A discharge port is provided at the bottom of the slurry preparation tank and connected to the inlet of the second centrifugal pump via a pipe.

[0008] In some embodiments, the feeding system includes a feeding trough, a first centrifugal pump, and a flow control valve, both of which are installed on a pipeline between the feeding trough and the first filter press; the washing system includes a washing tank and a first pneumatic valve, which is connected in parallel to the pipeline at the feed inlet of the first filter press, and a third pneumatic valve is also provided on the pipeline at the feed inlet of the first filter press; the central air blowing interface of the first filter press and the second filter press is connected to an air compressor through an air pipe, and a pressure regulating valve is provided on the air pipe; the first centrifugal pump, the second centrifugal pump, the pneumatic valve, and the air compressor are all electrically connected to a central controller.

[0009] In some embodiments, the liquid receiving flap device monitors the flipping angle through an angle sensor, and triggers the unloading action when the angle reaches a preset value; a filter screen is provided inside the inclined guide channel of the liquid receiving flap device to intercept solid particles in the filtrate.

[0010] In some embodiments, multiple layers of stirring blades are installed on the stirring shaft, and the blades are distributed at an angle to improve the mixing uniformity of materials during slurry preparation; a temperature sensor is provided on the inner side of the slurry preparation tank to monitor the hot water temperature.

[0011] In some embodiments, a liquid level sensor is installed in the filtrate tank and is electrically connected to a central controller to monitor the liquid level in the filtrate tank and control the discharge of filtrate from the liquid receiving flap device.

[0012] The technical solution of this utility model embodiment has at least the following advantages and beneficial effects: 1. This system, through a combination of structural design and process optimization, achieves a significant reduction in the washable molybdenum content in molybdenum slag and fully automated operation of the pressure filtration process, with technical effects that are significantly better than traditional processes. Attached Figure Description

[0013] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 The present invention provides a system flow diagram of a filter press system for reducing the washable molybdenum content in molybdenum slag, as shown in an embodiment of the present invention.

[0015] Icons: 1. First filter press; 2. Second filter press; 3. Slurry preparation tank; 4. First centrifugal pump; 5. Second centrifugal pump; 6. First pneumatic valve; 7. Second pneumatic valve; 8. Receiving tank; 9. Liquid receiving flap device; 10. Inclined guide channel; 11. Filtration tank; 12. Inverted conical receiving funnel; 13. Agitator shaft; 14. Agitator motor; 15. Feed trough; 16. Flow control valve; 17. Washing tank; 18. Third pneumatic valve; 19. Air compressor; 20. Agitator blade; 21. Third centrifugal pump. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0017] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0018] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0019] In the description of this utility model, it should be noted that if terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" appear to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0020] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0021] Please see Figure 1 As shown, the main body of this embodiment is a filter press system for reducing the washable molybdenum content of molybdenum slag, including two fully automatic plate and frame filter presses arranged in parallel, which are the first filter press and the second filter press in sequence along the material handling path. The feed inlet of the first filter press is connected to the end of the feeding system through a pipeline, and a slurry conditioning tank is set below the discharge outlet; the discharge pipe of the slurry conditioning tank is connected to the feed inlet of the second filter press after passing through a second centrifugal pump and a second pneumatic valve; a receiving tank is set below the discharge outlet of the second filter press. The end of the water washing system is connected in parallel with the pipeline at the feed inlet of the first filter press to form a water washing passage.

[0022] Furthermore, both the first and second filter presses have horizontal, plate-shaped liquid-receiving flap devices hinged below their outlets. An inclined guide channel is provided inside the liquid-receiving flap device, and the end of the guide channel is connected to the filtrate tank via a pipe. A filter screen is laid inside the guide channel to intercept solid particles in the filtrate. Correspondingly, inverted conical receiving funnels are installed below the liquid-receiving flap devices. The receiving funnel below the first filter press is aligned with the top opening of the slurry mixing tank, while the receiving funnel below the second filter press is aligned with the receiving tank.

[0023] Furthermore, the slurry preparation tank is cylindrical, with its top opening connecting to the discharge port of the first filter press via an inverted conical receiving funnel. A vertically mounted stirring shaft is installed inside the tank, with a stirring motor connected to a support at the top of the shaft and multiple layers of inclined stirring blades mounted on the shaft. A discharge port is located at the bottom of the slurry preparation tank, connected to the inlet of the second centrifugal pump via a pipe. A hot water pipe is connected to the middle of the tank's side wall, and a temperature sensor is installed inside to monitor the water temperature.

[0024] Furthermore, the feeding system includes a feeding trough, a first centrifugal pump, and a flow control valve. The first centrifugal pump and the flow control valve are installed on the pipeline between the feeding trough and the first filter press. The washing system includes a washing tank, a third centrifugal pump, and a first pneumatic valve. The washing system is connected in parallel to the pipeline at the feed inlet of the first filter press via a pipeline. A third pneumatic valve is also installed on this pipeline to switch between the feeding and washing paths. The air compressor is connected to the central air blowing interface of the first and second filter presses via an air pipe, and a pressure regulating valve is installed on the air pipe.

[0025] Furthermore, the first, second, and third centrifugal pumps, all pneumatic valves, and the air compressor are electrically connected to the central controller. The liquid receiving flap device monitors the flipping angle via an angle sensor, and a liquid level sensor is installed in the filtrate tank. All sensor signals are transmitted to the central controller for automated control.

[0026] The operation process of this system is as follows: The central controller controls the filter plates of the first filter press to close along the horizontal guide rail to form a sealed filter chamber. At the same time, the first centrifugal pump is turned on to transport the molybdenum-containing slurry in the feed tank to the feed hole at the top of the first filter press through the pipeline. The slurry flows into the filter chamber.

[0027] 1. Center air blowing and initial extrusion The air compressor supplies compressed air to the first filter press, blowing out the residual slurry in reverse through the feed hole of the filter plate; the liquid receiving flap device closes, and the diaphragm plate of the first filter press squeezes the material with a preset pressure. The dripping filtrate flows into the filtrate tank along the guide channel of the liquid receiving flap device, and the liquid level sensor in the filtrate tank monitors the liquid level in real time.

[0028] 2. First wash and second extrusion Hot alkaline water in the washing tank is injected into the filter chamber of the first filter press through the first pneumatic valve for washing; after washing, the diaphragm plate is squeezed a second time with higher pressure, and then the surface of the mud cake is dried by air blowing from the air compressor.

[0029] 3. Unloading the material from the plate. The liquid receiving flap device rotates around the hinge to a preset angle, the first filter press opens, and the mud cake falls into the slurry mixing tank below through the receiving funnel.

[0030] 4. Slurry preparation process After the mud cake falls into the mixing tank, the central controller controls hot water to flow tangentially into the side wall of the tank. At the same time, sodium hydroxide and hot water are added to the tank through a metering pump to adjust the alkalinity of the solution to the set value, and the ratio of solution to mud cake is controlled to a preset ratio. The stirring motor drives the stirring shaft to operate at a set speed, and the multi-layered inclined blades stir the material until it is uniformly dissolved. The temperature sensor inside the mixing tank monitors the water temperature in real time.

[0031] 5. Secondary filtration using the second filter press The slurry-conditioned material is then pumped to the second filter press via a second centrifugal pump, and the following process is repeated: Central air blowing: The air compressor blows away any residual slurry from the filter plate feed hole; Extrusion: The diaphragm plates extrude the material under set pressure; Air blowing: Drying the surface of the filter cake; Unloading: The liquid receiving flap device is opened, and the mud cake falls into the receiving tank through the receiving funnel, resulting in secondary slag with low washable molybdenum content.

[0032] It is worth mentioning that when the second filter press is performing secondary filtration, the first filter press simultaneously starts feeding a new batch of material. Through the parallel design of the three-way pipe and the feed pump, alternating operation is achieved. The single batch filtration cycle is consistent with the traditional online washing process. No manual intervention is required for unloading, receiving and other processes, realizing an automated process.

[0033] Experimental verification and data comparison Molybdenum-containing slurry from the same batch was divided into two groups: one group used the traditional online washing process (control group), and the other group used the slurry conditioning and alkaline washing process of this system (experimental group). The molybdenum content that can be washed from the molybdenum slag under different slurry conditioning alkalinity was compared.

[0034] The set parameters for the same batch of molybdenum-containing slurry are as follows: The raw material was 200L and divided into two portions. One portion was washed online as a control group, and the other portion was mixed and washed as an experimental group.

[0035] Online washing: 100L feed, 10min pressure holding, 100s water wash, 30s air blow, 300s water wash, 60s air blow, 500s water wash, 100s air blow.

[0036] Slurry preparation and washing: 100L feed, first extrusion 5min, first water washing 50s, second extrusion 10min, air blowing 20s, second filter pressing 10min, air blowing 30s.

[0037] Experimental data

[0038] Experimental conclusions 1. Traditional online washing processes prevent washing water from penetrating due to the compacted mud cake, resulting in a consistently high washable molybdenum content in the molybdenum slag (above 0.5%). The slurry-based alkaline washing process achieves deep washing through uniform dissolution of the material, reducing the washable molybdenum content to 0.30-0.34%, with the best results achieved at an alkalinity of 5 g / L, representing a 43% reduction compared to traditional processes.

[0039] 2. The liquid receiving and turning plate device achieves a filtrate recovery rate of over 95%, significantly improving the problem of filtrate waste; the alternating operation of the dual filter presses enables 24-hour continuous production, reducing the intensity of manual intervention to zero.

[0040] 3. The multi-layer inclined blade design of the mixing tank achieves a material mixing uniformity of 98%, shortening the mixing time by 30% compared to ordinary blades, thus verifying the optimized rationality of the device structure.

[0041] in: Angle sensor: When the liquid receiving flap device flips to the set angle, the response time of triggering the unloading signal is ≤0.5 seconds, which is synchronized with the opening action of the filter press.

[0042] Liquid level sensor: The liquid level control accuracy of the filter tank reaches ±2%, ensuring timely discharge of the filter liquid.

[0043] Temperature sensor: Hot water temperature monitoring error ≤ ±1℃, ensuring stable slurry preparation process parameters.

[0044] This system, through a combination of structural design and process optimization, achieves a significant reduction in the washable molybdenum content in molybdenum slag and fully automated operation of the pressure filtration process, with technical effects that are significantly better than traditional processes.

[0045] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A filter press system for reducing the washable molybdenum content in molybdenum slag, characterized in that, The system includes at least two fully automatic plate and frame filter presses arranged in parallel. The fully automatic plate and frame filter press includes a first filter press (1) and a second filter press (2) connected in series along the material path. The feed inlet of the first filter press (1) is connected to the end of the feeding system. The discharge outlet of the first filter press (1) is provided with a slurry conditioning tank (3). The discharge pipe of the slurry conditioning tank (3) is connected to the feed inlet of the second filter press (2) after passing through a second centrifugal pump (5) and a second pneumatic valve (7). A receiving tank (8) is provided below the discharge outlet of the second filter press (2). The feed inlet of the first filter press (1) is connected in parallel to the end of the water washing system.

2. The filter press system for reducing the washable molybdenum content of molybdenum slag according to claim 1, characterized in that, The first filter press (1) and the second filter press (2) are both hinged with horizontal plate-shaped liquid receiving flap devices (9) below their discharge ports. Both liquid receiving flap devices (9) are provided with inclined guide grooves (10) and are connected to the filtrate tank (11) through pipelines. Both liquid receiving flap devices (9) are provided with inverted conical receiving funnels (12) below their discharge ports. The inverted conical receiving funnel (12) below the first filter press (1) is connected to the slurry conditioning tank (3).

3. A filter press system for reducing the washable molybdenum content of molybdenum slag according to claim 2, characterized in that, The slurry preparation tank (3) is cylindrical, and its top opening is connected to the discharge port of the first filter press (1) through an inverted conical receiving funnel (12). A stirring shaft (13) is vertically installed inside the slurry preparation tank (3), and the top of the stirring shaft (13) is connected to a stirring motor (14) fixed to the top support of the slurry preparation tank (3). The bottom of the slurry preparation tank (3) is provided with a discharge port, which is connected to the inlet of the second centrifugal pump (5) through a pipe.

4. A filter press system for reducing the washable molybdenum content in molybdenum slag according to claim 1, characterized in that, The feeding system includes a feeding trough (15), a first centrifugal pump (4), and a flow control valve (16). The first centrifugal pump (4) and the flow control valve (16) are both installed on the pipeline between the feeding trough (15) and the first filter press (1). The washing system includes a washing tank (17), a third centrifugal pump (21), and a first pneumatic valve (6). The washing system is connected in parallel to the pipeline at the feed inlet of the first filter press (1). A third pneumatic valve (18) is also provided on the pipeline at the feed inlet of the first filter press (1). The central air blowing interface of the first filter press (1) and the second filter press (2) is connected to an air compressor (19) through an air pipe. A pressure regulating valve is provided on the air pipe.

5. A filter press system for reducing the washable molybdenum content of molybdenum slag according to claim 2, characterized in that, The liquid receiving flap device (9) monitors the flipping angle through an angle sensor, and triggers the unloading action when the angle reaches a preset value; a filter screen is set inside the inclined guide channel (10) of the liquid receiving flap device (9) to intercept solid particles in the filtrate.

6. A filter press system for reducing the washable molybdenum content of molybdenum slag according to claim 3, characterized in that, The stirring shaft (13) is equipped with multiple layers of stirring blades (20), which are distributed in an inclined manner to improve the mixing uniformity of materials during slurry preparation; a temperature sensor is provided on the inner side of the slurry preparation tank (3) to monitor the temperature of hot water.

7. A filter press system for reducing the washable molybdenum content of molybdenum slag according to claim 2, characterized in that, A liquid level sensor is installed in the filtrate tank (11). The liquid level sensor is electrically connected to the central controller to monitor the liquid level in the filtrate tank (11) and control the discharge of filtrate by the liquid receiving flap device (9).

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