Solid-liquid separation device for preparing iron phosphate

Abstract

The utility model discloses a kind of solid-liquid separation devices for iron phosphate preparation, including plate filter press, the frame of the filter plate of plate filter press is equipped with preheating block on both sides, and preheating block is equipped with preheating cavity in, and preheating cavity is equipped with spiral arrangement and is connected with the heat exchange tube of liquid inlet on filter plate, the filter plate of filter plate is equipped with cavity, and steam coil is equipped in the cavity, the outlet of steam coil is connected with preheating cavity, the other end of heat exchange tube is connected with liquid inlet pipe, and the gap between cavity and steam coil is filled with phase change material layer;The utility model utilizes the steam of discharge to carry out preheating to the iron phosphate solution that enters into filter press, so it can reduce its viscosity, avoid the occurrence of hole block phenomenon, steam heat energy recycling is carried out in this way, effectively improve the iron phosphate solution filtration temperature, reduce energy consumption simultaneously;And additionally preheating mechanism, it is convenient to existing filter plate to be reformed, and reconstruction amplitude is relatively.

Description

Technical Field

[0001] This utility model relates to the technical field of ferric phosphate filtration and separation, specifically a solid-liquid separation device for ferric phosphate preparation. Background Technology

[0002] The main uses of iron phosphate include battery materials, ceramics, catalysts, and fertilizer additives. In particular, it is used as a precursor in the production of lithium iron phosphate, a crucial cathode material for lithium batteries. In addition, it may be used as a supplement to phosphate fertilizer in agriculture and for corrosion prevention or ceramic manufacturing in industry. Iron salts (such as ferrous sulfate) are reacted with phosphates (such as sodium phosphate) in solution, and ferric phosphate precipitate is generated by controlling the pH value (usually 1.5-2.5). Common oxidants used are hydrogen peroxide (HO2) or air, and this process is mature and low-cost. The preparation process requires filtration of the fused material to obtain ferric phosphate. Ferric phosphate (FePO4) is prone to excessive viscosity during preparation, especially in the solid-liquid separation stage, which may lead to filter cake blockage and reduced equipment efficiency. Current methods utilize hot-press filter presses, but these use electric heating with low heating plate power density, failing to quickly compensate for heat loss. Existing steam-heated filters require 3-5 minutes for the steam regulating valve to activate and for the filter plate temperature to respond, resulting in slurry temperature fluctuations of ±8℃. When the coil layout is uneven, the temperature at the filter plate edge is more than 20℃ higher than the center, causing filter cloth embrittlement or material coking. Utility Model Content

[0003] To address the shortcomings of existing technologies, this invention provides a solid-liquid separation device for the preparation of ferric phosphate.

[0004] To solve the above-mentioned technical problems, this utility model provides the following technical solution: This utility model discloses a solid-liquid separation device for the preparation of ferric phosphate, comprising a plate filter press. The plate filter press features preheating blocks on both sides of its filter plate frame, each preheating block containing a preheating cavity. The preheating cavity contains a spirally arranged heat exchange tube connected to the liquid inlet on the filter plate. The filter plate has a cavity within it, containing a steam coil. The outlet of the steam coil is connected to the preheating cavity. The other end of the heat exchange tube is connected to a liquid inlet pipe. A phase change material layer fills the gap between the cavity and the steam coil.

[0005] As a preferred embodiment of this utility model, the heat exchange tube is threadedly connected to the liquid inlet.

[0006] As a preferred technical solution of this utility model, the preheating block and the frame of the filter press are fixed together by bolts, and a rubber sealing gasket is provided between them for sealing.

[0007] As a preferred technical solution of this utility model, the preheating block is provided with a through hole for the end of the heat exchange tube to pass through, and a sealing cap for sealing the connection between the preheating block and the heat exchange tube is threaded on the heat exchange tube, and a sealing gasket is provided between the sealing cap and the preheating block.

[0008] As a preferred embodiment of this utility model, the spiral end of the heat exchange tube is provided with multiple heat collection plates.

[0009] As a preferred embodiment of this utility model, the bottom of the preheating block is provided with a steam exhaust pipe, which is connected to a steam recovery device.

[0010] The beneficial effects of this utility model are: This solid-liquid separation device for preparing ferric phosphate incorporates a cavity within the filter plate, housing a steam coil within the cavity, and filling the gap between the cavity and the steam coil with a layer of phase change material. This combined steam heating and phase change material heat storage results in a small temperature fluctuation range. Furthermore, preheating blocks are installed on both sides of the filter plate frame of the plate filter press, utilizing the discharged steam to preheat the ferric phosphate solution entering the filter press. This reduces the viscosity and prevents clogging, thus recovering and utilizing steam heat energy. This effectively increases the filtration temperature of the ferric phosphate solution while reducing energy consumption. The addition of a preheating mechanism also facilitates the modification of existing filter plates with minimal modification required. Attached Figure Description

[0011] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the solid-liquid separation device for preparing ferric phosphate according to this utility model; Figure 2 This is a schematic diagram of the structure of a preheating block for a solid-liquid separation device for preparing ferric phosphate according to this utility model; Figure 3 This is a schematic diagram of the structure of a filter plate in a solid-liquid separation device for preparing ferric phosphate according to this utility model; Figure 4 This is a schematic diagram of the steam coil configuration of a solid-liquid separation device for preparing ferric phosphate according to this utility model; Figure 5 This is a schematic diagram of the cavity configuration of a solid-liquid separation device for preparing ferric phosphate according to this utility model.

[0012] In the diagram: 1. Plate filter press; 2. Filter plate; 3. Preheating block; 4. Preheating chamber; 5. Heat exchange tube; 6. Cavity; 7. Steam coil; 8. Liquid inlet pipe; 9. Phase change material layer; 10. Sealing gasket; 11. Through hole; 12. Sealing cover; 13. Rubber sealing gasket; 15. Steam exhaust pipe. Detailed Implementation

[0013] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0014] Example: Figure 1-4 As shown, this utility model discloses a solid-liquid separation device for the preparation of ferric phosphate, comprising a plate filter press 1. Preheating blocks 3 are provided on both sides of the frame of the filter plate 2 of the plate filter press 1, and a preheating cavity 4 is provided within the preheating blocks 3. A heat exchange pipe 5, spirally arranged and connected to the liquid inlet on the filter plate 2, is provided within the preheating cavity 4. A cavity 6 is provided within the filter plate of the filter plate 2, and a steam coil 7 is provided within the cavity 6. The outlet of the steam coil 7 is connected to the preheating cavity 4. An inlet pipe 8 is connected to the other end of the heat exchange pipe 5. A phase change material layer 9 is filled in the gap between the cavity 6 and the steam coil 7. By setting a cavity 6 inside the filter plate and installing a steam coil 7 inside the cavity 6, and filling the gap between the cavity 6 and the steam coil 7 with a phase change material layer 9, steam heating and phase change material heat storage are used in combination, resulting in a small temperature fluctuation range. Furthermore, preheating blocks 3 are provided on both sides of the frame of the filter plate 2 of the plate filter press 1, so that the discharged steam is used to preheat the ferric phosphate solution entering the filter press, which can reduce its viscosity and avoid clogging. This steam heat energy recovery and utilization effectively improves the filtration temperature of the ferric phosphate solution while reducing energy consumption.

[0015] The heat exchange tube 5 is threaded to the liquid inlet, which facilitates installation and minimizes changes to the existing filter press structure.

[0016] The preheating block 3 is fixed to the frame of the filter press plate 2 by bolts, and a sealing gasket 10 is provided between them for sealing. This facilitates installation, makes little change to the existing filter press plate structure, and ensures good sealing performance.

[0017] The preheating block 3 is provided with a through hole 11 for the end of the heat exchange tube 5 to pass through. A sealing cap 12 for sealing the connection between the preheating block 3 and the heat exchange tube 5 is threaded on the heat exchange tube 5. A rubber sealing gasket 13 is provided between the sealing cap 12 and the preheating block 3. This ensures that the connection between the preheating block 3 and the heat exchange tube 5 has good sealing performance after installation and that steam leakage will not occur.

[0018] The heat exchange tube 5 has multiple heat collection plates at its spiral end to increase the heat exchange area and thus ensure a better preheating effect.

[0019] The bottom of the preheating block 3 is provided with a steam pipe 15, which is connected to a steam recovery device, so as to facilitate the recovery of the used steam and condensate.

[0020] During operation, this solid-liquid separation device for preparing ferric phosphate uses a cavity 6 inside the filter plate and a steam coil 7 inside the cavity 6. A phase change material layer 9 is filled in the gap between the cavity 6 and the steam coil 7. This combination of steam heating and phase change material heat storage results in a small temperature fluctuation range. Furthermore, preheating blocks 3 are provided on both sides of the filter plate 2 of the plate filter press 1. The discharged steam is used to preheat the ferric phosphate solution entering the filter press, reducing its viscosity and preventing clogging. This steam heat recovery effectively increases the filtration temperature of the ferric phosphate solution while reducing energy consumption.

[0021] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A solid-liquid separation device for the preparation of ferric phosphate, comprising a plate filter press (1), characterized in that, The plate filter press (1) has preheating blocks (3) on both sides of the filter plate (2), and the preheating blocks (3) have a preheating chamber (4) inside. The preheating chamber (4) has a spirally arranged heat exchange tube (5) connected to the liquid inlet on the filter plate (2). The filter plate (2) has a cavity (6) inside, and the cavity (6) has a steam coil (7) inside. The outlet of the steam coil (7) is connected to the preheating chamber (4). The other end of the heat exchange tube (5) is connected to the liquid inlet pipe (8). The gap between the cavity (6) and the steam coil (7) is filled with a phase change material layer (9).

2. The solid-liquid separation device for preparing ferric phosphate according to claim 1, characterized in that, The heat exchange tube (5) is threadedly connected to the liquid inlet.

3. The solid-liquid separation device for preparing ferric phosphate according to claim 2, characterized in that, The preheating block (3) and the filter press plate (2) are fixed together by bolts, and a sealing gasket (10) is provided between them for sealing.

4. The solid-liquid separation device for preparing ferric phosphate according to claim 1, characterized in that, The preheating block (3) is provided with a through hole (11) through which the end of the heat exchange tube (5) passes. The heat exchange tube (5) is threaded with a sealing cap (12) for sealing the connection between the preheating block (3) and the heat exchange tube (5). A rubber sealing gasket (13) is provided between the sealing cap (12) and the preheating block (3).

5. The solid-liquid separation device for preparing ferric phosphate according to claim 4, characterized in that, The spiral end of the heat exchange tube (5) is provided with multiple heat collection plates.

6. The solid-liquid separation device for preparing ferric phosphate according to claim 1, characterized in that, The bottom of the preheating block (3) is provided with a steam pipe (15), which is connected to a steam recovery device.

Images