A dosing system and method for dewatering of a slurry material by pressure filtration

Abstract

The application provides a dosing system for filter pressing and dewatering of ore pulp material, which comprises an array of multiple feeding pipes and an array of multiple fixed rings, one feeding pipe being connected with one fixed ring in a one-to-one correspondence; an array of multiple filter discs is arranged below the multiple fixed rings, one fixed ring corresponding to one filter disc, and filter cloth being arranged on the upper layer of the multiple filter discs; the multiple fixed rings are configured to move in a vertical direction; the dosing system further comprises an air compressor, which is connected with the multiple feeding pipes and used for applying pressure to the multiple filter chambers through the multiple feeding pipes; a pressure gauge is connected below each filter disc, and used for detecting the filter pressing pressure of the ore pulp material mixed with multiple groups of filter aids and coarse materials. Before the ore pulp material enters the filter press, the filter pressing and dewatering comparative experiment of the filter aids and the coarse materials is carried out through the bypass of the feeding pipe, so that the optimal addition amount of the filter aids and the coarse materials is obtained, and the precise and automatic addition of the filter aids and the coarse materials in the filter pressing and dewatering process of the ore pulp material is realized.

Description

Technical Field

[0001] This invention relates to the field of solid-liquid separation technology in mineral processing, and in particular to a dosing system and dosing method for dewatering mineral slurry by pressure filtration. Background Technology

[0002] Material filtration involves a wide range of fields, and with the development of resources, the concentrates and tailings produced by mineral processing are becoming increasingly fine-grained. The increase in the content of fine particles in mineral slurry materials will cause problems such as difficulty in cake formation, prolonged filtration cycle, and accumulation of fine mud, making it difficult for filtration equipment to achieve the purpose of intercepting fine materials.

[0003] Taking filter presses as an example, filter presses are the main filtration equipment in the solid-liquid separation industry, suitable for the solid-liquid separation of various suspended solids, and characterized by good separation effect, convenient operation, and safety and reliability. In daily production, various factors such as the particle size and elemental composition of the feed slurry, filtration time, and pressure all affect the filtration efficiency of the filter press. As fine particles adhere to the surface of the filter cloth of the filter press to form a filter cake, the filter cake becomes the filtration medium. As the filter cake thickens and becomes denser, the resistance increases. When the filtration resistance and liquid phase pressure reach equilibrium, the filtration process becomes difficult to carry out.

[0004] Therefore, for fine-particle, viscous slurry materials, filter cloth clogging often occurs during pressure filtration, resulting in poor filtration efficiency, thin filter cakes with high moisture content, and difficult unloading. To improve the liquefaction solids content and achieve rapid solid-liquid separation, filter aids or coarse materials are added during the filtration of the feed slurry. Adding coarse materials to the slurry can act as a skeleton due to the localized contact between coarse particles, reducing the frictional resistance experienced by the filtrate as it permeates the filter cake medium. However, as the amount added increases, the mass concentration of the slurry increases, and the filter cake formed by the mutual wrapping and filling of coarse and fine tailings particles becomes denser, reducing effective pores. This leads to a decrease in filtrate flow rate, and the increase in unevenly distributed coarse and fine particles increases frictional losses during permeation, resulting in a greater pressure drop during filtration. Therefore, excessive addition of coarse materials in tailings filtration processes is detrimental to increasing filter cake yield. Flocculants contain chemical groups that can interact with particle surfaces, creating a bridging effect. After dissolution, the exposed active groups adsorb suspended particles in the slurry, forming flocs and increasing the filter cake space. However, the amount of flocculant added must be appropriate. Excessive flocculant will cause the tailings particles to be completely adsorbed without adsorption sites, resulting in the flocculant losing its bridging effect and forming stable particles without vacancies. Simultaneously, due to the steric hindrance effect of the polymer adsorption membrane, mineral particles repel each other, returning to a stable dispersed state and failing to form large flocs. The mineral particles encapsulated by the flocculant form a relatively dense structure, which is detrimental to filtrate permeation. Furthermore, excessive flocculant increases filtrate viscosity, increases seepage resistance, further reduces filtrate permeation rate, and decreases filtration pressure drop and filter cake yield.

[0005] In most actual production processes, the coarse materials or filter aids added to the filter press are generally added manually. Due to many factors such as changes in the state of the slurry and differences in the personal experience and operating habits of the filter press operators, it is difficult to accurately control the proportion of coarse materials or filter aids added manually. This results in large errors and uneven addition of coarse materials or filter aids, leading to low-quality and poor-efficiency filtered products, high labor intensity and cost, and affecting filtration efficiency.

[0006] In recent years, online particle size analyzers and online fluorescence spectrometers have been used to detect the concentration, particle size, and other characteristics of slurry materials. This allows for pretreatment of the slurry materials by coarsening and adding filter aids, and control of the filter press operating parameters. This method is expected to achieve intelligent control of the filter press process, reduce the moisture content of the filter cake after dewatering, and improve the filter press efficiency. However, in actual production, slurry materials are complex and diverse, instrument detection methods are lacking, or the detection results of existing instruments are not accurate enough. Furthermore, the data on the characteristics of slurry materials cannot be directly correlated with the filter press efficiency and filter cake quality, making it difficult to accurately control the dosing of chemicals during filter press, resulting in production difficulties in dewatering. Summary of the Invention

[0007] This invention provides a dosing system and method for dewatering mineral slurry by pressure filtration, in order to solve the technical problem in the prior art that it is difficult to achieve precise control of the dosing of mineral slurry by pressure filtration, resulting in dewatering difficulties.

[0008] The technical solution provided by this invention is as follows:

[0009] One object of the present invention is to provide a dosing system for dewatering mineral slurry by pressure filtration, the dosing system comprising a reagent tank, a coarse material bin, and a mineral slurry distributor;

[0010] The reagent tank is connected to the feed pipe, the coarse material silo is connected to the feed pipe, and the reagent tank, coarse material silo, and feed pipe are connected to the slurry material distributor; the reagent tank stores filter aid, and the coarse material silo stores coarse-mixed materials;

[0011] The dosing system also includes an array of multiple feed tubes and an array of multiple fixing rings, with one feed tube connected to one fixing ring in a one-to-one correspondence.

[0012] Multiple filter discs are arrayed below the multiple fixed rings, with one fixed ring corresponding to one filter disc, and filter cloth is covering the upper layer of the multiple filter discs; the multiple fixed rings are configured to move in the vertical direction;

[0013] When the plurality of fixing rings move downward in the vertical direction to press the plurality of filter discs, the plurality of filter discs form a plurality of sealed filter chambers, wherein the filter cloth is located between the fixing rings and the filter discs;

[0014] The slurry material distributor is connected to multiple feed pipes and is used to transport slurry material, filter aid and coarse material to multiple filter chambers through the multiple feed pipes.

[0015] The dosing system also includes an air compressor connected to a plurality of feed pipes for applying pressure to a plurality of filter chambers through the plurality of feed pipes.

[0016] Each of the filter discs is connected to a pressure gauge for pressure testing of the slurry material containing multiple sets of mixed filter aids and coarse materials.

[0017] In a preferred embodiment, the dosing system further includes a valve assembly, which includes a feed solenoid valve, a dosing solenoid valve, a plurality of air intake solenoid valves, and a plurality of filter solenoid valves.

[0018] The feed solenoid valve is arranged between the feed pipe and the slurry material distributor, and is used to control the delivery of slurry material to the slurry material distributor.

[0019] The dosing solenoid valve is arranged between the feed pipe and the slurry material distributor, and is used to control the delivery of filter aid to the slurry material distributor and the delivery of filter aid to the feed pipe.

[0020] One of the air intake solenoid valves is arranged on one of the feed pipes for controlling the pressure filtration of a slurry material containing a mixture of filter aid and coarse material into one of the filter chambers.

[0021] One of the filter solenoid valves is arranged below one of the filter discs for controlling the discharge of filtrate formed in the filter chamber.

[0022] In a preferred embodiment, the coarse material silo includes a weighing device, a dryer, a screw feeder, and a belt conveyor;

[0023] The weighing device is used to weigh the coarse material; the dryer is used to dry the weighed coarse material.

[0024] The screw feeder is used to convey the dry coarse material to the belt conveyor; the belt conveyor is used to convey the dry coarse material to the slurry material distributor and to the feed pipe.

[0025] In a preferred embodiment, the dosing system further includes an electric telescopic rod, and a plurality of the fixed rings are connected to the electric telescopic rod, which drives the plurality of fixed rings to move in the vertical direction.

[0026] In a preferred embodiment, the air compressor is connected to an air storage tank, the air storage tank is connected to a plurality of the feed pipes, and the air compressor is connected to the plurality of feed pipes through the air storage tank.

[0027] In a preferred embodiment, the pressure gauge includes a pressure detection sensor, a timing module, and a microprocessor;

[0028] The pressure sensor is used to detect the pressure of the slurry material containing the mixed filter aid and coarse materials during the pressure filtration process.

[0029] The timing module is used to record the pressure change over time during the filtration process of the slurry material containing the mixed filter aid and coarse materials.

[0030] The microprocessor is used to convert the pressure change over time during the filtration process of the slurry containing mixed filter aids and coarse materials into the flow rate of the filtrate during the filtration process.

[0031] In a preferred embodiment, multiple feed pipes are connected to vent valves for venting multiple filter chambers after the pressure test of multiple sets of mixed filter aids and coarse materials is completed.

[0032] In a preferred embodiment, the dosing system further includes a clean water pump for cleaning the multiple filter chambers after the pressure test of the slurry material containing multiple mixed filter aids and coarse materials is completed.

[0033] Another object of the present invention is to provide a dosing method for dewatering mineral slurry by pressure filtration. Using the dosing system for dewatering mineral slurry by pressure filtration provided by the present invention, filter aids and coarse materials are added to the mineral slurry. The dosing method includes the following steps:

[0034] S1. Multiple fixing rings move downwards in the vertical direction to press the multiple filter discs, forming multiple sealed filter chambers, wherein the filter cloth is located between the fixing rings and the filter discs;

[0035] S2. The slurry material distributor collects slurry material from the feed pipe, the reagent tank delivers filter aid to the slurry material distributor, and the coarse material bin delivers coarse material to the slurry material distributor.

[0036] S3, the slurry material distributor transports the slurry material, filter aid and coarse material to multiple filter chambers through multiple feed pipes;

[0037] S4. Pressure is applied to multiple filter chambers, and pressure gauges are used to test the filtration pressure of multiple groups of mixed filter aids and coarse materials in the slurry to determine the amount of filter aids and coarse materials to be added.

[0038] S5. After the pressure test of the slurry material containing multiple mixed filter aids and coarse materials is completed, multiple fixing rings move upward in the vertical direction and separate from the multiple filter discs.

[0039] S6. Filter aid is fed into the feed pipe according to the amount of filter aid added as determined in step S4, and coarse material is fed into the feed pipe according to the amount of coarse material added as determined in step S4.

[0040] In a preferred embodiment, in step S5, after the pressure test of the multiple sets of mixed filter aids and coarse materials in the slurry is completed, the multiple filter chambers are cleaned.

[0041] The above-described technical solution of the present invention has at least the following beneficial effects compared with the prior art:

[0042] This invention provides a dosing system and method for dewatering mineral slurry by pressure filtration. A sample of the mineral slurry is obtained online in the feed pipe of the fine-grained mineral slurry dewatering process. Different amounts of filter aid or coarse material are added and then pumped into the filter chamber. Multiple sets of pressure filtration comparison experiments are conducted simultaneously. Through experimental techniques, the accurate dosage of reagents is determined, enabling precise and automatic addition of reagents or coarse materials in the mineral slurry dewatering process. This improves filter cake quality and pressure filtration efficiency, achieving rapid and stable filtration and dewatering of the mineral slurry. This is of great significance for reducing the workload of workers and improving production efficiency.

[0043] This invention provides a dosing system and method for dewatering mineral slurry by pressure filtration. A slurry sample is obtained online through the feed pipe of the fine-particle dewatering process. Different amounts of filter aid or coarse material are added and then pumped into the filter chamber. Multiple sets of pressure filtration dewatering comparative experiments are conducted simultaneously. The filtrate is discharged into a waste liquid tank. A pressure gauge detects the pressure change over time during the pressure filtration process. The data is transmitted to a host computer via a wireless transmission module to determine the optimal amount of filter aid or coarse material to be added. The host computer controls the automatic addition of filter aid or coarse material to the feed tank. After the pressure filtration test is completed, the filter cloth can be automatically rinsed.

[0044] This invention provides a dosing system and method for dewatering mineral slurry by pressure filtration. Before the mineral slurry enters the filter press, a comparative experiment on pressure filtration dewatering is conducted by adding filter aid and coarse material through a bypass in the feed pipe to obtain the optimal dosage of filter aid and coarse material. This enables precise and automatic addition of chemicals for the pressure filtration and dewatering process of mineral slurry, improves filter cake quality and pressure filtration efficiency, and achieves rapid and stable filtration and dewatering of mineral slurry. It has universal applicability. Attached Figure Description

[0045] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0046] Figure 1 This is a schematic diagram of a dosing system for dewatering mineral slurry by pressure filtration according to the present invention. Detailed Implementation

[0047] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the described embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0048] Unless otherwise defined, the technical or scientific terms used in this invention shall have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms “first,” “second,” and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms “an,” “a,” or “the,” and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms “comprising,” “including,” or “including,” and similar terms mean that the device or object preceding the term encompasses the device or object listed following the term and its equivalents, without excluding other devices or objects. The terms “connected,” “linked,” or “connected,” and similar terms are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect.

[0049] It should be noted that the terms "up", "down", "left", "right", "front", and "back" used in this invention are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0050] Combination Figure 1 According to an embodiment of the present invention, a dosing system for dewatering mineral slurry by pressure filtration is provided, which is used to collect mineral slurry from feed pipe 1, conduct comparative experiments on the filter aid and coarse material added to the mineral slurry in real time, and accurately add filter aid and coarse material to feed pipe 1 according to the comparative experiment results.

[0051] A dosing system for dewatering mineral slurry by pressure filtration includes a valve group 2, a reagent tank 4, a coarse material bin 5, a mineral slurry distributor 6, an air compressor 7, a feed pipe 10, a fixing ring 12, a filter disc 13, and a pressure gauge 15.

[0052] The reagent tank 4 is connected to the feed pipe 1, the coarse material bin 5 is connected to the feed pipe 1, and the reagent tank 4, coarse material bin 5 and feed pipe 1 are connected to the slurry material distributor 6.

[0053] The reagent tank 4 stores filter aids, and the coarse material silo 5 stores coarse materials. Further, the filter aids include, but are not limited to, polyacrylamide, polyethylene oxide, cationic starch, chitosan, polyethyleneimine, and polyamide. The coarse materials include, but are not limited to, sawdust, coarse tailings, and diatomaceous earth.

[0054] Valve group 2 includes a feed solenoid valve 201, a dosing solenoid valve 202, multiple air intake solenoid valves 204 and multiple filter solenoid valves 203.

[0055] A feed solenoid valve 201 is arranged between the feed pipe 1 and the slurry distributor 6 to control the delivery of slurry material to the slurry distributor 6. Furthermore, a flow meter 3 is also installed between the feed pipe 1 and the slurry distributor 6 to measure the flow rate of the slurry material delivered to the slurry distributor 6.

[0056] A solenoid valve 202 is arranged between the feed pipe 1 and the slurry distributor 6 to control the delivery of filter aid to the slurry distributor 6 and the delivery of filter aid to the feed pipe 202. Furthermore, a flow meter 401 is also installed between the feed pipe 1 and the slurry distributor 6 to measure the flow rate of filter aid delivered to the slurry distributor 6 and the flow rate of filter aid delivered to the feed pipe 202.

[0057] Furthermore, the dosing solenoid valve 202 and the reagent flow meter 401 are in two sets. One set is arranged on the pipeline between the reagent tank 4 and the feed pipe 1, and the other set is arranged on the pipeline between the reagent tank 4 and the slurry material distributor 6.

[0058] The coarse material silo 5 includes a weighing device 501, a dryer 502, a screw feeder 503, and a belt conveyor 504. The weighing device 501 is used to weigh the coarse material to ensure accurate addition. The dryer 502 is used to dry the weighed coarse material to prevent it from becoming damp and clogging the screw feeder 503. The screw feeder 503 conveys the dried coarse material to the belt conveyor 504. The belt conveyor 504 conveys the dried coarse material to the slurry distributor 6 and to the feed pipe 1.

[0059] According to an embodiment of the present invention, a dosing system for dewatering mineral slurry by pressure filtration further includes an electrically operated telescopic rod 11, an array of multiple feed pipes 10, and an array of multiple fixing rings 12, with each feed pipe 10 corresponding to one fixing ring 12. A plurality of filter discs 13 are arrayed below the fixing rings 12, with each fixing ring 12 corresponding to one filter disc 13, and filter cloth 16 covering the filter discs 13. The fixing rings 12 are configured to move vertically. The mesh size of the filter cloth 16 is preferably 30 μm.

[0060] When multiple fixing rings 12 move downwards in the vertical direction to press multiple filter discs 13, the multiple filter discs 13 form multiple sealed filter chambers, wherein the filter cloth 16 is located between the fixing rings 12 and the filter discs 13.

[0061] Furthermore, multiple fixed rings 12 are connected to an electric telescopic rod 11, and the electric telescopic rod 11 drives the multiple fixed rings 12 to move in the vertical direction.

[0062] The slurry distributor 6 is connected to multiple feed pipes 10, used to transport slurry, filter aid, and coarse materials to multiple filter chambers through the feed pipes 10. Specifically, multiple fixing rings 12 move vertically downwards to press multiple filter discs 13, forming multiple sealed filter chambers. The slurry distributor 6 transports the slurry, filter aid, and coarse materials to the multiple filter chambers through the feed pipes 10, enabling pressure testing of multiple sets of mixed filter aid and coarse material slurry materials.

[0063] According to an embodiment of the present invention, a dosing system for dewatering mineral slurry by pressure filtration further includes an air compressor 7, which is connected to a plurality of feed pipes 10 for applying pressure to a plurality of filter chambers through the plurality of feed pipes 10.

[0064] Furthermore, the air compressor 7 is connected to an air storage tank 701, which is connected to multiple feed pipes 10. The air compressor 7 is connected to multiple feed pipes 10 through the air storage tank 701. An intake solenoid valve 204 is arranged on one of the feed pipes 10 to control the pressure filtration of a slurry material containing a mixture of filter aid and coarse materials in a filter chamber.

[0065] When multiple fixed rings 12 move downwards in the vertical direction to press multiple filter discs 13, the multiple filter discs 13 form multiple sealed filter chambers. The air compressor 7 works to deliver compressed air to the air storage tank 701. The air intake solenoid valve 204 controls the compressed air to enter the filter chamber through the feed pipe 10, applying pressure to the filter chamber to filter the slurry material mixed with filter aid and coarse material in the filter chamber.

[0066] According to an embodiment of the present invention, each filter disc 13 is connected to a pressure gauge 15 for pressure testing of the slurry material containing multiple sets of mixed filter aids and coarse materials. A filter solenoid valve 203 is arranged below each filter disc 13 for controlling the discharge of filtrate formed in the filter chamber.

[0067] In some embodiments, the air compressor 7 includes, but is not limited to, a screw compressor, an axial compressor, a liquid-reciprocating compressor, a vane compressor, a rotary compressor, and a Roots twin-rotor compressor. The present invention stores compressed air in an air tank 701, thus shortening operation time.

[0068] This invention utilizes an array of multiple filter discs 13 to simultaneously conduct pressure testing experiments on multiple groups of mixed filter aids and coarse materials in slurry. In this embodiment, four filter discs 13 are arrayed, corresponding to four feed pipes 10, four fixing rings 12, four air inlet solenoid valves 204, four pressure gauges 15, and four filter solenoid valves 203, allowing for four sets of comparative experiments. In some embodiments, more filter discs 13 can be arrayed to conduct pressure testing experiments on more groups of slurry, determining the optimal amount of filter aid and coarse material to be added to the feed pipe 1 through comparative experiments.

[0069] According to an embodiment of the present invention, a dosing system for dewatering mineral slurry by pressure filtration further includes an air release valve 8, a clean water pump 14, a waste liquid tank 17, a feed tank 20, a feed pump 21, and a dewatering device 22.

[0070] During the pressure test of the slurry material containing multiple mixed filter aids and coarse materials, the filtrate formed in the filter chamber is discharged into the waste liquid tank 17 through the filter solenoid valve 203. Multiple feed pipes 10 are connected to vent valves 8, which are used to vent multiple filter chambers after the pressure test of the slurry material containing multiple mixed filter aids and coarse materials is completed.

[0071] The clear water pump 14 is connected to the clear water tank 9. After the pressure test of the slurry material containing multiple mixed filter aids and coarse materials is completed, multiple filter chambers are cleaned. The waste liquid after cleaning is discharged into the waste liquid tank 17 through the filter solenoid valve 203.

[0072] Specifically, the water pump 14 is arranged above multiple filter discs 13. After the pressure test of multiple sets of mixed filter aids and mineral slurry materials with coarse materials is completed, multiple fixing rings 12 move upward in the vertical direction and separate from multiple filter discs 13. The water pump 14 pumps the water in the water tank 9 into the filter chamber to clean the filter cloth 16 and filter discs 13.

[0073] This invention determines the optimal amounts of filter aid and coarse material added to the feed pipe 1 by conducting pressure tests on multiple groups of mixed filter aids and coarse materials in the slurry. The reagent tank 4 delivers filter aid to the feed pipe 1 according to the determined amount, and the coarse material silo 5 delivers coarse material to the feed pipe 1 according to the determined amount. The feed pipe 1 transports the slurry containing the added filter aid and coarse material to the feed tank 20, and then pumps it into the dewatering equipment 22 via the feed pump 21 for pressure filtration and dewatering.

[0074] In some embodiments, the dewatering equipment 22 includes, but is not limited to, a vacuum filter, a pressure filter, a plate and frame filter press, a diaphragm rapid filter press, a belt filter press, and a ceramic filter.

[0075] According to an embodiment of the present invention, a dosing system for dewatering mineral slurry by pressure filtration further includes a display 19 and a host computer 18. The operator operates the host computer 18 through the display 19 to control the opening and closing of the valve group 2 and the vent valve 8, control the operation of the coarse material silo 5, control the operation of the electric telescopic rod 11, control the operation of the air compressor 7, and control the operation of the clean water pump 14 and the feed pump 21.

[0076] According to an embodiment of the present invention, the pressure gauge 15 includes a pressure detection sensor 1501, a storage module 1502, a wireless transmission module 1503, a timing module 1504, a power supply 1505, and a microprocessor 1506.

[0077] Pressure sensor 1501 is used to detect the pressure of the slurry material mixed with filter aid and coarse materials during the filtration process. Timing module 1504 is used to record the pressure change over time during the filtration process. Microprocessor 1506 is used to convert the pressure change over time during the filtration process into the flow rate of the filtrate. Storage module 1502 stores the data processed by microprocessor 1506 and transmits it to host computer 18 via wireless transmission module 1503. Host computer 18 processes the data and displays it on display 19. Power supply 1505 supplies power to pressure gauge 15.

[0078] During the pressure testing experiment of slurry material containing multiple mixed filter aids and coarse materials, the data of the flow meter 3, the reagent flow meter 401, the weighing device 501 and the pressure gauge 15 are transmitted to the host computer 18 and displayed on the display 19 in real time.

[0079] According to embodiments of the present invention, a method for adding chemicals to a slurry for filter press dewatering is provided. Using a chemical addition system for slurry filter press dewatering provided by the present invention, filter aids and coarse materials are added to the slurry, comprising the following steps:

[0080] Step S1: Multiple fixing rings 12 move downwards in the vertical direction to press multiple filter discs 13, forming multiple sealed filter chambers, wherein the filter cloth 16 is located between the fixing rings 12 and the filter discs 13.

[0081] Specifically, the pressure gauge 15, host computer 18 and display 19 are turned on. The host computer 18 controls the electric telescopic rod 11 to press the fixing ring 12 onto the filter disc 13 covering the upper filter cloth 16, forming multiple sealed filter chambers.

[0082] Step S2: The slurry distributor 6 collects slurry material from the feed pipe 1, the reagent tank 4 delivers filter aid to the slurry distributor 6, and the coarse material bin 5 delivers coarse material to the slurry distributor 6.

[0083] Specifically, the host computer 18 controls the feed solenoid valve 201 and the flow meter 3 to collect slurry material from the feed pipe 1 in the fine slurry dewatering process. The host computer 18 controls the opening and closing of the dosing solenoid valve 202, and the reagent tank 4 delivers different doses of filter aid to the slurry material distributor 6. The host computer 18 controls the screw feeder 503 and the belt conveyor 504 of the coarse material bin 5 to deliver different amounts of coarse material to the slurry material distributor 6.

[0084] Step S3: The slurry distributor 6 delivers the slurry, filter aid, and coarse material to multiple filter chambers through multiple feed pipes 10.

[0085] Specifically, the slurry distributor 6 delivers slurry, different dosages of filter aid, and different amounts of coarse materials to different filter chambers in equal quantities for comparative experiments.

[0086] For example, the host computer 18 controls the opening and closing of the dosing solenoid valve 202, the reagent tank 4 delivers a dose of filter aid a to the distributor 6, and the host computer 18 controls the screw feeder 503 and belt conveyor 504 of the coarse material silo 5 to deliver a dosage of coarse material a' to the slurry material distributor 6.

[0087] The slurry distributor 6 delivers the slurry, a dose of filter aid a, and a dose of coarse material a' to a filter chamber.

[0088] The host computer 18 controls the opening and closing of the dosing solenoid valve 202, and the reagent tank 4 delivers filter aid with a dosage of b to the distributor 6. The host computer 18 controls the screw feeder 503 and belt conveyor 504 of the coarse material silo 5 to deliver coarse material with a dosage of b' to the slurry material distributor 6.

[0089] The slurry distributor 6 conveys the slurry, filter aid at a dosage of b, and coarse material at a dosage of b' to another filter chamber.

[0090] The amount of filter aid and coarse material added to the slurry material in each filter chamber is different. The slurry material distributor 6 ensures that the amount of slurry entering each filter chamber is the same, thus ensuring the accuracy of the comparative experiment.

[0091] In some preferred embodiments, the slurry distributor 6 delivers 300 ml of slurry to each filter chamber.

[0092] Step S4: Apply pressure to multiple filter chambers. Pressure gauge 15 performs pressure testing on multiple groups of mixed filter aids and coarse materials in the slurry to determine the amount of filter aids and coarse materials to be added.

[0093] Specifically, after adding mixed filter aid and coarse material slurry to multiple filter chambers, the upper control unit 18 controls the intake solenoid valve 204 to close, and controls the air compressor 7 to compress air into the air storage tank 701.

[0094] The host computer 18 controls the air compressor 7 to stop, and controls the intake solenoid valve 204 and the filter solenoid valve 203 to open. The compressed air in the air storage tank 701 applies pressure to the slurry in multiple filter chambers for pressure filtration. After passing through the filter cloth 16, the filtrate is discharged into the waste liquid tank 17 by the filter solenoid valve 203.

[0095] During the filtration process of slurry in multiple filter chambers, the pressure sensor 1501 of the pressure gauge 15 detects the pressure of the slurry material containing the mixed filter aid and coarse materials during the filtration process. The timing module 1504 records the pressure change of the slurry material containing the mixed filter aid and coarse materials over time during the filtration process.

[0096] The microprocessor 1506 converts the pressure change over time of the slurry material mixed with filter aid and coarse materials during the filtration process into the flow rate of the filtrate. The storage module 1502 stores the data processed by the microprocessor 1506 and transmits it to the host computer 18 via the wireless transmission module 1503. The host computer 18 processes the data and displays it on the display 19. Simultaneously, the data on the amount of filter aid added collected by the reagent flow meter 401 and the amount of coarse materials added collected by the weighing device 501 are also processed by the host computer 18 and displayed on the display 19.

[0097] By comparing the pressure change over time during the filtration process of slurry material under different amounts of filter aid and coarse material, the filtration effect is best when the pressure is reduced to a certain value (e.g., 0.01 MPa). The optimal amount of filter aid and coarse material is obtained, and the host computer 18 uses this to control the amount of filter aid and coarse material added to the feed tank 20 before the dewatering equipment 22.

[0098] After step S5, when the pressure test of the slurry material containing multiple mixed filter aids and coarse materials is completed, multiple fixing rings 12 move upward in the vertical direction and separate from multiple filter discs 13.

[0099] Specifically, when the reading of pressure gauge 15 drops to a certain value (e.g., 0.01 MPa), the host computer 18 controls the intake solenoid valve 204 and the pressure gauge filter solenoid valve 203 to close, and the pressure filtration process ends.

[0100] The host computer 18 controls the vent valve 8 to open. After a period of time, the host computer 18 controls the electric telescopic rod 11 to separate the fixing ring 12 from the filter disc 13, thus cleaning multiple filter chambers. Specifically, the host computer 18 controls the clean water pump 14 to draw clean water from the clean water tank 9 to rinse the filter cake on the filter cloth 16, preventing the filter disc 13 from clogging. The rinsing waste liquid flows into the waste liquid tank 17.

[0101] Step S6: Filter aid is fed into the feed pipe according to the amount of filter aid added in step S4, and coarse material is fed into the feed pipe 1 according to the amount of coarse material added in step S4.

[0102] Specifically, the host computer 18 controls the dosing solenoid valve 202, the screw feeder 503 of the coarse material bin 5, and the belt conveyor 504 to deliver the filter aid and coarse material to the feed pipe 1 based on the determined optimal amount of filter aid and coarse material to be added.

[0103] The slurry material with the optimal amount of filter aid and coarse material is transported to the feed tank 20 through the feed pipeline 1. The host computer 18 controls the feed pump 21 to pump the slurry material with the optimal amount of filter aid and coarse material into the dewatering equipment 22 for pressure filtration and dewatering.

[0104] In one embodiment, using the dosing system and method for dewatering mineral slurry by pressure filtration provided by the present invention, 0 g t of chemicals is added to a mineral slurry with a mass concentration of 20% after the addition of coarse materials. -1 20g.t -1 40g.t -1 60g.t -1 The pressure filtration performance of the polyacrylamide solution was tested, and the result was that adding 0 g.t... -1 20g.t -1 40g.t -1 60g.t -1 After adding the polyacrylamide solution, the pressure filtration times were 124, 88, 119, and 136 s, respectively. The results indicate that adding 20 g of coarse material to a slurry with a mass concentration of 20% is effective. -1 The filtration performance of the slurry material is best after applying a polyacrylamide solution.

[0105] This invention provides a dosing system and method for dewatering mineral slurry by pressure filtration. It is used for the precise and automatic addition of reagents in the process of dewatering mineral slurry by pressure filtration, thereby improving the quality of filter cake and the efficiency of pressure filtration, and realizing the rapid and stable filtration and dewatering of mineral slurry. It has universal applicability.

[0106] The following points need to be explained:

[0107] (1) The accompanying drawings of the embodiments of the present invention only involve the structures involved in the embodiments of the present invention. Other structures can refer to the general design.

[0108] (2) For clarity, the thickness of layers or regions is enlarged or reduced in the drawings used to describe embodiments of the present invention; that is, these drawings are not drawn to scale. It is understood that when a device such as a layer, film, region, or substrate is referred to as being “above” or “below” another device, the device may be “directly” located “above” or “below” the other device or there may be intermediate devices.

[0109] (3) Where there is no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other to obtain new embodiments.

[0110] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. The scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A dosing system for dewatering mineral slurry by pressure filtration, characterized in that, The dosing system includes a reagent tank, a coarse material silo, and a slurry distributor; The reagent tank is connected to the feed pipe, the coarse material silo is connected to the feed pipe, and the reagent tank, coarse material silo, and feed pipe are connected to the slurry material distributor; the reagent tank stores filter aid, and the coarse material silo stores coarse-mixed materials; The dosing system also includes an array of multiple feed tubes and an array of multiple fixing rings, with one feed tube connected to one fixing ring in a one-to-one correspondence. Multiple filter discs are arrayed below the multiple fixed rings, with one fixed ring corresponding to one filter disc, and filter cloth is covered on the upper layer of the multiple filter discs; The plurality of said fixed rings are configured to move in a vertical direction; When the plurality of fixing rings move downward in the vertical direction to press the plurality of filter discs, the plurality of filter discs form a plurality of sealed filter chambers, wherein the filter cloth is located between the fixing rings and the filter discs; The slurry material distributor is connected to multiple feed pipes and is used to transport slurry material, filter aid and coarse material to multiple filter chambers through the multiple feed pipes. The dosing system also includes an air compressor connected to a plurality of feed pipes for applying pressure to a plurality of filter chambers through the plurality of feed pipes. Each of the filter discs is connected to a pressure gauge for pressure testing of slurry materials containing multiple sets of mixed filter aids and coarse materials. The dosing system also includes a valve group, which includes a feed solenoid valve, a dosing solenoid valve, multiple air intake solenoid valves, and multiple filter solenoid valves. The feed solenoid valve is arranged between the feed pipe and the slurry material distributor, and is used to control the delivery of slurry material to the slurry material distributor. The dosing solenoid valve is arranged between the feed pipe and the slurry material distributor, and is used to control the delivery of filter aid to the slurry material distributor and the delivery of filter aid to the feed pipe. One of the air intake solenoid valves is arranged on one of the feed pipes for controlling the pressure filtration of a slurry material containing a mixture of filter aid and coarse material into one of the filter chambers. One of the filter solenoid valves is arranged below one of the filter discs for controlling the discharge of filtrate formed in the filter chamber; The coarse material silo includes a weighing device, a dryer, a screw feeder, and a belt conveyor; The weighing device is used to weigh the coarse material; the dryer is used to dry the weighed coarse material. The screw feeder is used to convey the dry coarse material to the belt conveyor; the belt conveyor is used to convey the dry coarse material to the slurry distributor and to the feed pipe. The feed pipe transports the slurry material with added filter aid and coarse materials to the feed tank, and then pumps it into the dewatering equipment for pressure filtration and dewatering.

2. The dosing system according to claim 1, characterized in that, The dosing system also includes an electric telescopic rod, and multiple fixed rings are connected to the electric telescopic rod, which drives the multiple fixed rings to move in the vertical direction.

3. The dosing system according to claim 1, characterized in that, The air compressor is connected to an air storage tank, the air storage tank is connected to multiple feed pipes, and the air compressor is connected to multiple feed pipes through the air storage tank.

4. The dosing system according to claim 1, characterized in that, The pressure gauge includes a pressure detection sensor, a timing module, and a microprocessor; The pressure sensor is used to detect the pressure of the slurry material containing the mixed filter aid and coarse materials during the pressure filtration process. The timing module is used to record the pressure change over time during the filtration process of the slurry material containing the mixed filter aid and coarse materials. The microprocessor is used to convert the pressure change over time during the filtration process of the slurry containing mixed filter aids and coarse materials into the flow rate of the filtrate during the filtration process.

5. The dosing system according to claim 1, characterized in that, Multiple feed pipes are connected to vent valves, which are used to vent air from multiple filter chambers after the pressure test of multiple sets of mixed filter aids and coarse materials in the slurry is completed.

6. The dosing system according to claim 1, characterized in that, The dosing system also includes a clean water pump, which is used to clean the multiple filter chambers after the pressure test of the slurry material containing multiple mixed filter aids and coarse materials is completed.

7. A method for adding chemicals in the dewatering of mineral slurry by pressure filtration, characterized in that, Using the dosing system according to any one of claims 1 to 6, a filter aid and a coarse additive are added to the slurry material, the dosing method comprising the following steps: S1. Multiple fixing rings move downwards in the vertical direction to press the multiple filter discs, forming multiple sealed filter chambers, wherein the filter cloth is located between the fixing rings and the filter discs; S2. The slurry material distributor collects slurry material from the feed pipe, the reagent tank delivers filter aid to the slurry material distributor, and the coarse material bin delivers coarse material to the slurry material distributor. S3, the slurry material distributor transports the slurry material, filter aid and coarse material to multiple filter chambers through multiple feed pipes; S4. Pressure is applied to multiple filter chambers, and pressure gauges are used to test the filtration pressure of multiple groups of mixed filter aids and coarse materials in the slurry to determine the amount of filter aids and coarse materials to be added. S5. After the pressure test of the slurry material containing multiple mixed filter aids and coarse materials is completed, multiple fixing rings move upward in the vertical direction and separate from the multiple filter discs. S6. Filter aid is fed into the feed pipe according to the amount of filter aid added as determined in step S4, and coarse material is fed into the feed pipe according to the amount of coarse material added as determined in step S4.

8. The dosing method according to claim 7, characterized in that, In step S5, after the pressure test of the slurry material containing multiple mixed filter aids and coarse materials is completed, multiple filter chambers are cleaned.

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