Washing water treatment system for belt filter

Abstract

The utility model relates to the technical field of filters, in particular to a washing water treatment system for a belt filter. Wherein the belt filter is sequentially provided with a plurality of immersion cleaning sections along the filtering stroke direction, the last one or more immersion cleaning sections of the plurality of immersion cleaning sections are used as rear immersion cleaning sections, and the washing water treatment system comprises a tail liquid collecting tank, a clarifying tank, a cloth washing water tank and a filter cloth washing system. And the tail liquid collecting tank is used for collecting filtrate generated in the rear immersion cleaning section. The clarifying tank is used for settling the filtrate. And the cloth water washing tank is used for collecting supernate generated after sedimentation. And the filter cloth washing system is used for extracting the supernatant from the cloth washing water tank and washing the filter cloth of the belt filter by taking the supernatant as cloth washing water. Through the synergistic effect of the structures, existing filtrate is effectively utilized, the concentration of qualified liquid is improved, cyclic utilization of water resources in the system is achieved, and the production cost is reduced.

Description

Technical Field

[0001] This utility model relates to the field of filter technology, specifically to a washing water treatment system for a belt filter. Background Technology

[0002] Belt filters, also known as chain belt filters, are a type of continuous filter and a new type of high-efficiency dewatering equipment. Their operation is similar to a belt conveyor; slurry materials are dewatered during transport, solids and liquids are separated, and residue is filtered. There are two structural types: pressurized and depressurized. The latter is a vacuum filter. Vacuum rubber belt filters have advantages such as high filtration efficiency, large production capacity, good washing effect, low filter cake moisture, flexible operation, and low maintenance costs, and are widely used in metallurgy, mining, chemical, and other fields.

[0003] Existing belt filters typically include multiple continuous washing sections for continuous washing. The belt filter includes a water source for providing wash water, which is divided into two parts: one part serves as the washing liquid for the last washing section, used to directly wash the filter cake from that section; the other part serves as washing water for cleaning the filter cloth. Each washing section includes a filtrate collection tank, into which the filtrate from each section is collected. The filtrate from the last washing section's collection tank, along with the washing water, is pumped to the top of the filter as the washing liquid for the second-to-last washing section's filter cake; the filtrate from the second-to-last washing section's collection tank serves as the washing liquid for the third-to-last washing section, and so on, up to the first washing section. The filtrate from the first washing section is directly mixed evenly with the washed material and pumped as a slurry into the filter's distributor, where it forms a filter cake in the filter's drying section under the action of the distributor.

[0004] The current vanadium production process uses circulating water for washing the filter cloth in belt filters, resulting in a large water consumption. Furthermore, the circulating water used for washing the filter cloth directly enters the vanadium-containing leachate, leading to a low vanadium concentration. The concentration directly affects the amount of wastewater generated in the subsequent vanadium precipitation process; a higher concentration results in a smaller volume of qualified liquid and less wastewater production, while a lower concentration generates more wastewater and higher wastewater treatment costs. In addition, this slows down the production pace and significantly impacts capacity expansion. Therefore, the existing technology still needs improvement. Utility Model Content

[0005] The sodium-based continuous leaching process for vanadium extraction using belt filters requires a wash water temperature of 85℃ or higher. Meanwhile, with continuous research into vanadium precipitation technology, significant breakthroughs have been achieved in the precipitation of high-concentration vanadium solutions. After adopting a continuous precipitation process, normal ammonium salt precipitation of vanadium solutions containing up to 70 g / L of vanadium is now possible. The existing water leaching process, yielding vanadium solutions with a concentration of 45 g / L, cannot meet the requirements for low-cost production.

[0006] In view of this, this utility model provides a washing water treatment system for belt filters for low-concentration vanadium solutions, which can at least solve the problems of large water consumption and high production costs when existing belt filters treat low-concentration vanadium solutions.

[0007] This utility model proposes a washing water treatment system for a belt filter. The belt filter is based on a belt filter with multiple immersion sections arranged sequentially along the filtration path. The last one or more immersion sections are designated as post-immersion sections. The washing water treatment system of this application includes: a tail liquid collection tank, a clarification tank, a cloth washing water tank, and a filter cloth washing system. The tail liquid collection tank is used to collect the filtrate produced in the post-immersion sections. The clarification tank is connected to the tail liquid collection tank and is used to settle the filtrate. The cloth washing water tank is connected to the clarification tank and is used to collect the supernatant produced after settling. The filter cloth washing system is connected to the cloth washing water tank and is used to extract the supernatant from the cloth washing water tank and use the supernatant as washing water to clean the filter cloth of the belt filter.

[0008] In some embodiments, the washing water treatment system further includes a cloth washing water recycling system, which collects the cloth washing water generated after cleaning the filter cloth and uses the collected cloth washing water as rinsing water in the post-immersion washing section.

[0009] In some embodiments, the clarification tank is a sleeve-type clarification tank, comprising: an outer cylinder, an inner cylinder, and a conical bottom. The inner cylinder is disposed inside the outer cylinder and extends vertically, with its height lower than that of the outer cylinder. The conical bottom is disposed at the bottom of the outer cylinder, and a first drain valve is disposed at the bottom of the conical bottom. The upper part of the inner cylinder is connected to a tail liquid collection tank via a first pipe, and the upper part of the outer cylinder is connected to a cloth washing water tank via a second pipe.

[0010] In some embodiments, the first conduit is equipped with a water pump.

[0011] In some embodiments, the interior of the washing tank is provided with an inclined base plate, and a second drain valve is provided above the lowest point of the base plate.

[0012] In some embodiments, the filter cloth washing system includes: a spray washing device, a washing water pump, and washing water piping. The spray washing device is used to spray washing water onto the surface of the filter cloth. The washing water pump is used to pressurize and deliver the supernatant in the washing water tank to the spray washing device. The washing water piping is used to connect the washing water tank, the washing water pump, and the spray washing device.

[0013] In some embodiments, the fabric washing water recycling system includes: a flow channel, a fabric washing water recovery tank, and a reuse pump and control system. The flow channel is located below the filter cloth spray cleaning area. The fabric washing water recovery tank is used to store the recycled fabric washing water. The reuse pump and control system are used to pump the fabric washing water in the fabric washing water recovery tank to the post-washing section of the belt filter.

[0014] In some embodiments, the fabric washing water recycling system further includes a filtration device disposed between the guide channel and the fabric washing water recycling tank, for intercepting impurities in the fabric washing water.

[0015] In some embodiments, a filtrate tank is provided below each immersion section, and the filtrate tank corresponding to the subsequent immersion section is connected to the tail liquid collection tank through a third pipe, and a flow regulating valve is provided on the third pipe.

[0016] In some embodiments, the belt filter has 4 to 10 immersion sections.

[0017] The beneficial effects of this utility model are as follows: This application addresses the low-concentration vanadium solution filtered from the last one or more immersion sections of a belt filter press by setting up a tail liquid collection tank, a clarification tank, a cloth washing water tank, and a filter cloth washing system. Utilizing their synergistic effect, the concentration of qualified filtrate is effectively increased based on the existing filtrate, and water resources are recycled within the system, reducing fresh water consumption and lowering production costs. This also meets the requirements of environmental protection and sustainable development. Furthermore, the filter cloth washing system uses the supernatant as washing water to clean the filter cloth, which can promptly remove residual impurities and contaminants from the filter cloth, reducing the impact of impurities on the filtration process, thereby ensuring the treatment quality of the low-concentration vanadium solution and resulting in a higher purity and more stable quality of the final vanadium product. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other embodiments can be obtained based on these drawings without creative effort.

[0019] Figure 1 A schematic diagram of the distribution of a washing water treatment system for a belt filter provided in one embodiment of the present invention;

[0020] Figure 2 This is a flowchart illustrating the operation of a washing water treatment system for a belt filter, as provided in one embodiment of the present invention.

[0021] Explanation of reference numerals in the attached figures:

[0022] 1. Filter cloth; 2. Filtrate tank corresponding to the post-washing section; 3. Tail liquid collection tank; 4. Clarification tank; 5. Washing water tank; 6. Washing water pump; 7. Washing water recovery tank. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be further described in detail below with reference to specific examples and accompanying drawings.

[0024] It should be noted that all uses of "first" and "second" in the embodiments of this utility model are for the purpose of distinguishing two entities or parameters with the same name but different names. It is clear that "first" and "second" are only for the convenience of expression and should not be construed as limiting the embodiments of this utility model. Subsequent embodiments will not explain this in detail.

[0025] In the sodium-based continuous leaching process for vanadium extraction using a belt filter, a belt filter is used to leach, wash, and separate the vanadium from the roasted clinker, allowing the vanadium in the clinker to enter the solution and obtain a vanadium-containing leachate. This vanadium-containing leachate can be obtained from vanadium slag after sodium salt roasting, or it can be obtained from further vanadium extraction from vanadium-containing raw materials such as steel slag and ferrophosphate.

[0026] This utility model provides a washing water treatment system for a belt filter, specifically for treating low-concentration vanadium solution. The belt filter has multiple rinsing sections arranged sequentially along the filtration path. The filtrate obtained from the first few rinsing sections has a higher vanadium concentration and can be directly leached into a vanadium-containing leaching solution purification system, subsequently stored as a qualified solution. In one embodiment of this application, the last one or more (e.g., the last or two) rinsing sections are designated as post-rinsing sections. The filtrate obtained from these post-rinsing sections has a lower vanadium concentration and can be treated by the washing water treatment system of this application. Specifically, as... Figure 1 As shown, the washing water treatment system for a belt filter includes: a tail liquid collection tank 3, a clarification tank 4, a cloth washing water tank 5, and a filter cloth washing system (not shown in the figure). The tail liquid collection tank 3 collects the filtrate generated from the post-washing stage. The clarification tank 4 is connected to the tail liquid collection tank 3 and is used to settle the collected filtrate from the post-washing stage. The cloth washing water tank 5 is connected to the clarification tank 4 and is used to collect the supernatant generated after settling. The filter cloth washing system is connected to the cloth washing water tank 5 and is used to extract the supernatant and use it as washing water to clean the filter cloth 1 of the belt filter.

[0027] This application addresses the low-concentration vanadium solution filtered from the last one or more immersion sections of a belt filter press. It establishes a tail liquid collection tank 3, a clarification tank 4, a cloth washing water tank 5, and a filter cloth washing system. Utilizing their synergistic effect, the concentration of qualified filtrate is effectively increased based on the existing filtrate, while also achieving water resource recycling within the system, reducing fresh water consumption, lowering production costs, and meeting environmental protection and sustainable development requirements. Furthermore, the filter cloth washing system uses the supernatant as washing water to clean the filter cloth 1, effectively removing residual impurities and contaminants from the filter cloth 1, reducing the impact of impurities on the filtration process, thereby ensuring the treatment quality of the low-concentration vanadium solution and resulting in a higher purity and more stable quality of the final vanadium product.

[0028] In some embodiments, the washing water treatment system further includes a fabric washing water recycling system. This system collects the fabric washing water generated after cleaning the filter cloth 1 and uses it as rinsing water in the subsequent soaking stage. Based on existing water resource recycling, this embodiment utilizes the fabric washing water recycling system to collect the fabric washing water generated after cleaning the filter cloth 1 again for use as rinsing water in the subsequent soaking stage, forming a more complete closed-loop water resource recycling system. This increases the number of times water is recycled within the system, further reducing the consumption of fresh water and improving the overall efficiency of water resource utilization.

[0029] In some embodiments, such as Figure 1 As shown, the clarification tank 4 is a sleeve-type clarification tank, comprising an outer cylinder, an inner cylinder, and a conical bottom. The inner cylinder is located inside the outer cylinder and runs vertically through it, with its height lower than that of the outer cylinder. The conical bottom is located at the bottom of the outer cylinder, and a first drain valve is installed at the bottom of the conical bottom. The upper part of the inner cylinder is connected to the tail liquid collection tank 3 via a first pipe, and the upper part of the outer cylinder is connected to the fabric washing tank 5 via a second pipe. The diameters of the first and second pipes can be 150 mm, and the first drain valve can be a DN100 drain valve. When the filtrate enters the inner cylinder from the tail liquid collection tank 3 through the first pipe, due to the vertical continuity of the inner cylinder and its lower height than the outer cylinder, the water will first undergo a preliminary sedimentation process within the inner cylinder, and then continue to rise through the area between the inner and outer cylinders. Finally, the supernatant produced after sedimentation overflows from the second pipe at the top of the outer cylinder to the fabric washing tank 5. During the sedimentation process, solid particles gradually deposit at the conical bottom. Due to the shape characteristics of the conical bottom, the solids gradually accumulate towards the center of the conical bottom, forming a relatively concentrated solids layer. When it is necessary to discharge solids, simply open the first drain valve to easily discharge most of the solids, avoiding excessive accumulation of solids in the tail liquid collection tank 3.

[0030] In some embodiments, a water pump is installed on the first pipe. As the wash water flows from the tail liquid collection tank 3 through the first pipe into the inner cylinder of the clarification tank 4, the first pipe creates some resistance to the water flow. The water pump provides additional pressure to support the flow of the wash water.

[0031] In some embodiments, such as Figure 1 As shown, the interior of the washing water tank 5 is equipped with an inclined bottom plate. The inclined bottom plate allows impurities, sludge, and other particulate matter in the washing water to naturally accumulate at a lower level under the influence of gravity. A second drain valve is installed above the lowest point of the bottom plate to ensure that most of the impurities and sludge accumulated here are discharged from the tank in a timely manner. The second drain valve can be a DN100 drain valve.

[0032] In some embodiments, the filter cloth washing system includes a spray washing device, a washing water pump 6, and washing water pipelines. The spray washing device sprays washing water onto the surface of the filter cloth 1 to effectively remove contaminants such as solid particles, impurities, and residues adhering to the surface of the filter cloth 1. Specifically, the spray washing device is typically designed with multiple nozzles or spray heads, enabling the washing water to be evenly distributed across all parts of the filter cloth 1, ensuring that every part of the filter cloth 1 is thoroughly cleaned and avoiding the problem of incomplete cleaning in certain areas. The washing water pump 6 pressurizes and delivers the supernatant in the washing water tank 5 to the spray washing device, providing a stable water source for the spray washing device. The washing water pipelines connect the washing water tank 5, the washing water pump 6, and the spray washing device, forming a water flow channel. Due to the coordinated operation of the spray washing device, the washing water pump 6, and the washing water pipelines, the cleaning time can be significantly shortened, and production efficiency can be improved. The rapid cleaning process allows the filter cloth 1 to be put back into production more quickly, increasing the company's output and profits.

[0033] In some embodiments, the fabric washing water recycling system includes: a guide channel, a fabric washing water recycling tank 7, and a reuse pump and control system. The guide channel is located below the spray cleaning area of ​​the filter cloth 1 to effectively collect the fabric washing water flowing down from the filter cloth 1. Specifically, the shape and structure of the guide channel are typically designed according to actual production needs to ensure that the fabric washing water flows smoothly into the fabric washing water recycling tank 7. The fabric washing water recycling tank 7 is used to store the recycled fabric washing water. The fabric washing water recycling tank 7 can be designed and selected according to actual needs to meet the requirements for fabric washing water storage under different production conditions. The reuse pump and control system are used to pump the fabric washing water from the fabric washing water recycling tank 7 to the post-washing section of the belt filter. The control system works in conjunction with the reuse pump to achieve precise control of the fabric washing water recycling process. Specifically, it can automatically adjust the operating parameters of the reuse pump, such as start / stop time and flow rate, according to the actual situation in the production process, such as the degree of soiling of the filter cloth 1 and the production progress. This optimizes the efficiency of fabric washing water use and avoids excessive water use or waste of water resources.

[0034] As the washing water flows through the guide channel into the washing water recovery tank 7, it may carry various impurities that have detached from the filter cloth 1, such as solid particles and fiber fragments. If these impurities directly enter the washing water recovery tank 7, they may gradually accumulate inside the tank, causing blockages in the tank's channels, pipes, and other parts. In some embodiments, the washing water recycling system of this application further includes a filtration device, which is disposed between the guide channel and the washing water recovery tank 7 to intercept impurities in the washing water and prevent them from entering the washing water recovery tank 7. This protects the washing water recovery tank 7 and its subsequently connected pipes, valves, pumps, and other equipment, ensuring the normal operation of these devices and reducing the maintenance and upkeep work required due to blockages.

[0035] In some embodiments, a filtrate tank is provided below each immersion section to effectively collect the filtrate generated in each immersion section. The filtrate tank 2 corresponding to the last immersion section is connected to the tail liquid collection tank 3 through a third pipe. In particular, only the filtrate tank corresponding to the last immersion section can be connected to the tail liquid collection tank 3 through the third pipe. A flow regulating valve is provided on the third pipe. The flow regulating valve can precisely control the flow rate of the filtrate from the last immersion section into the tail liquid collection tank 3 according to actual production needs, thereby adjusting the liquid volume of the fabric washing water tank 5.

[0036] In some embodiments, the belt filter has 4 to 10 of the above-mentioned immersion sections, which can be used to fully leach, wash and separate solids and liquids of roasted clinker, thereby increasing the concentration of qualified filtrate.

[0037] This utility model takes a belt filter containing four immersion sections as an example to describe in detail the working process of the washing water treatment system proposed in the following preferred embodiments, which can clarify the above-mentioned objectives, features and advantages of this utility model.

[0038] like Figure 2As shown, the workflow of the washing water treatment system in this embodiment includes: leaching and washing the roasted clinker using a belt filter to allow vanadium in the roasted clinker to enter the solution, followed by separation of the filtrate from the filter cake. Since the vanadium concentration in the filtrate from the first two leaching sections of the belt filter is relatively high, the filtrate from these sections is directly leached into the vanadium-containing leaching solution purification system and subsequently stored as a qualified solution. Since the vanadium concentration in the filtrate obtained after the third and fourth leaching sections is relatively low, the low-concentration vanadium filtrate generated from these sections is introduced into the tailings collection tank 3 for collection. When the filtrate collected in the tailings collection tank 3 reaches a certain level, a water pump is used to pump the filtrate from the tailings collection tank 3 into the clarification tank 4 for sedimentation. The supernatant produced by sedimentation overflows into (or can be pumped out) the washing water tank 5, and then is transported to the spray washing device via the washing water pump 6 and washing water pipeline. The spray washing device sprays the supernatant as washing water onto the surface of the filter cloth 1 to effectively remove solid particles, impurities, and residues adhering to the surface of the filter cloth 1. The washing water after washing the filter cloth 1 is introduced into the filtration device through the guide channel for filtration. The washing water after filtration enters the washing water recovery tank 7 for storage. Then, as needed, the reuse pump and control system are activated to pump the washing water in the washing water recovery tank 7 to the third immersion section of the belt filter for reuse as rinsing water.

[0039] After applying the washing water treatment system of this utility model, approximately 12 m³ of circulating water can be reduced per hour from entering the vanadium-containing leaching solution. After rinsing filter cloth 1 with the supernatant of low-concentration vanadium solution, the tailings parameters are controlled, the service life of filter cloth 1 is stable, and steam consumption is reduced. Through overflow operation and timed sewage discharge, the impurity content of the washing water is effectively reduced, and the number of times the washing water nozzles need cleaning is reduced from 4 times per day when using circulating water to 1-2 times per day, effectively reducing labor intensity.

[0040] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0041] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A wash water treatment system for a belt filter, the belt filter being provided with a plurality of dip wash sections in series in a filter travel direction, characterized by, The last one or more of the plurality of immersion washing sections is taken as a post-immersion washing section, and the washing water treatment system comprises: a tail liquid collecting tank (3) for collecting filtrate generated by the post-immersion washing section; a clarification tank (4) in communication with the tail liquid collecting tank (3) and used for sedimentation of the filtrate; a washing water tank (5) in communication with the clarification tank (4) and used for collecting supernatant generated after sedimentation; a filter cloth washing system in communication with the washing water tank (5) and used for extracting the supernatant from the washing water tank (5) and washing the filter cloth (1) of the belt filter with the supernatant as washing water.

2. The wash water treatment system of claim 1, wherein, The washing water recycling system is further included for collecting washing water generated after washing of the filter cloth (1) and using the collected washing water generated after washing of the filter cloth (1) as rinsing water of the post-immersion washing section.

3. The wash water treatment system of claim 1, wherein, The clarification tank (4) is a sleeve type clarification tank comprising: an outer sleeve; an inner sleeve arranged inside the outer sleeve and penetrating through the inner sleeve from top to bottom, with a height lower than that of the outer sleeve; a conical bottom arranged at the bottom of the outer sleeve, with a first blowdown valve arranged at the bottom of the conical bottom; wherein the upper part of the inner sleeve is in communication with the tail liquid collecting tank (3) through a first pipeline, and the upper part of the outer sleeve is in communication with the washing water tank (5) through a second pipeline.

4. The wash water treatment system of claim 3, wherein The first pipeline is provided with a water pump.

5. The wash water treatment system of claim 1, wherein, The inside of the washing water tank (5) is provided with an inclined bottom plate, and a second blowdown valve is arranged above the lowest part of the bottom plate.

6. The wash water treatment system of claim 1, wherein, The filter cloth washing system comprises: a spray washing device for spraying washing water to the surface of the filter cloth (1); a washing water pump (6) for pressurized delivery of the supernatant in the washing water tank (5) to the spray washing device; and a washing water pipeline for connecting the washing water tank (5), the washing water pump (6) and the spray washing device.

7. The wash water treatment system of claim 2, wherein, The washing water recycling system comprises: a flow guide groove arranged below the spray washing area of the filter cloth (1); a washing water recycling tank (7) for storing recycled washing water; a recycling pump and control system for pumping the washing water in the washing water recycling tank (7) to the post-immersion washing section of the belt filter.

8. The wash water treatment system of claim 7, wherein, The washing water recycling system further comprises a filtering device arranged between the flow guide groove and the washing water recycling tank (7) for intercepting impurities in the washing water.

9. The wash water treatment system of claim 1, wherein, A filtrate tank is correspondingly arranged below each of the immersion washing sections, and the filtrate tank (2) corresponding to the post-immersion washing section is tapped to the tail liquid collecting tank (3) through a third pipeline, with a flow regulating valve arranged on the third pipeline.

10. The wash water treatment system of claim 1, wherein, The belt filter has 4-10 immersion washing sections.

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