Filtering system for wet fine grinding of outer ore

Abstract

The invention discloses a wet-type fine grinding outer ore filtering system, and relates to the technical field of pellet preparation, the filtering system comprises a first cyclone, a second cyclone, a concentration tank mechanism, a disc filter and a plate-and-frame filter press, an ore feeding port of the first cyclone is used for receiving ore pulp output by a wet-type ball mill through wet-type fine grinding outer ore, and the ore feeding port of the second cyclone is used for receiving ore pulp output by a wet-type ball mill through wet-type fine grinding outer ore; an underflow opening of the first cyclone is used for being communicated with a wet ball mill, the grading particle size of the second cyclone is smaller than that of the first cyclone, an ore feeding opening of the second cyclone is communicated with an overflow opening of the first cyclone, and an inlet of the concentration tank mechanism is communicated with an overflow opening of the second cyclone; an inlet of the disc filter is communicated with an underflow port of the second cyclone, and an inlet of the plate-and-frame filter press is communicated with an underflow port of the concentration tank mechanism. By reducing the workload of the filter press, the intermittent operation of the filter press does not negatively affect the overall filtering efficiency, and the purposes of reducing the filtering moisture and improving the filtering effect are achieved during filtering treatment of preparing pellets from fine-ground outer ores.

Description

Technical Field

[0001] The invention relates to the technical field of pellet preparation, in particular to a filtering system for wet fine grinding of external ore. Background Art

[0002] At present, with the increase in the proportion of pellets used in domestic blast furnaces, the demand for iron ore concentrate for pellets has increased significantly, resulting in a shortage of iron ore concentrate in the market. The use of finely ground external ore to prepare pellets has become the choice of most steel mills. The raw materials for finely ground external ore are mainly imported sintered powder ore, which is mainly a mixed mineral of limonite and hematite. Wet fine grinding and filtration are often used to treat this type of ore. During the fine grinding process, the ore faces the problem of easy mudification. In particular, the presence of limonite makes it easier to mud after fine grinding, producing a large amount of fine-grained ore mud, which worsens the filtration effect.

[0003] At present, the main equipment for filtering foreign ores after fine grinding is disc vacuum filtration and plate-frame filter press. Due to the limitation of vacuum degree, the filter moisture of the concentrate after fine grinding and filtering of foreign ores is generally about 15%, and the filter cake is muddy, with poor filtering effect. The plate-frame filter press can make the pressure reach 10 times that of vacuum filtration under the action of compressed air, which can reduce the filter moisture of difficult-to-filter mineral powder, but because the filter press is an intermittent operation, the filtering capacity is also low. The advanced foreign filter press ensures the highest unit filtering capacity by shortening the compression cycle time, but it also makes the investment cost of the filtering equipment too high. Summary of the invention

[0004] In order to solve the above problems, the present application provides a filtering system for wet fine grinding of external ore.

[0005] The present application provides a filtering system for wet fine grinding of external ore, the filtering system comprising a first cyclone, a second cyclone, a concentrator mechanism, a disc filter and a plate-frame filter press, the feed port of the first cyclone is used to receive the ore pulp output by the wet ball mill through the wet fine grinding of the external ore, the underflow port of the first cyclone is used to communicate with the wet ball mill, the classification particle size of the second cyclone is smaller than the classification particle size of the first cyclone, the feed port of the second cyclone is connected to the overflow port of the first cyclone, the inlet of the concentrator mechanism is connected to the overflow port of the second cyclone, the inlet of the disc filter is connected to the underflow port of the second cyclone, and the inlet of the plate-frame filter press is connected to the underflow port of the concentrator mechanism.

[0006] In some embodiments, the filtration system further comprises:

[0007] The mixing device is opposite to the disc filter and the plate and frame filter press. The mixing device is used to receive the first filter cake output by the disc filter and the second filter cake output by the plate and frame filter press, and the mixing device is used to mix the first filter cake and the second filter cake in a proportion, and the proportion is the ratio of the ore content contained in the underflow slurry output from the underflow port of the second cyclone to the ore content contained in the overflow slurry output from the overflow port of the second cyclone.

[0008] In some embodiments, the filtration system further comprises:

[0009] The measuring proportion component is used to obtain the numerical value of the proportion. The measuring proportion component includes a flow measuring component and a concentration measuring component. The flow measuring component and the concentration measuring component respectively measure the flow and ore concentration of the underflow slurry and overflow slurry output by the second cyclone.

[0010] In some embodiments, the ratio is 5-7.

[0011] In some embodiments, the overflow port of the concentrating tank mechanism is used to communicate with the water inlet of the wet ball mill so as to return the overflow liquid output from the overflow port of the concentrating tank mechanism to the water inlet of the wet ball mill.

[0012] In some embodiments, the concentrator mechanism is a deep cone concentrator, which is equipped with a flocculant adding device. An overflow turbidity meter is installed at the overflow port of the deep cone concentrator, which is used to detect the turbidity of the overflow liquid output from the overflow port of the deep cone concentrator.

[0013] In some embodiments, the disc filter and the plate and frame filter press are respectively provided with filtered water outlets, and the filtered water outlets of the disc filter and the plate and frame filter press are both used to connect with the water inlet of the wet ball mill so as to return the filtered water outputted from the filtered water outlets of the disc filter and the plate and frame filter press to the water inlet of the wet ball mill.

[0014] In some embodiments, based on the composition of the finely ground ore of the wet ball mill being limonite and hematite, the ore particle size in the slurry output by the wet fine grinding of the external ore is -200 mesh accounting for 75%-85% and -325 mesh accounting for 30%-40%, the selection of the first cyclone requires a diameter of 200mm-500mm, and the selection of the second cyclone requires a diameter of <125mm.

[0015] In some embodiments, the fractional particle size of the first cyclone is 75 μm, and the fractional particle size of the second cyclone is 40 μm.

[0016] In some embodiments, the moisture content of the first filter cake outputted from the disc filter is 12.5%-13.5%, and the moisture content of the second filter cake outputted from the plate and frame filter press is 12%-13.6%.

[0017] The beneficial effects of the present application are as follows: a filtration system for wet fine grinding of external ore is provided, comprising a first cyclone, a second cyclone, a concentrator mechanism, a disc filter and a plate-frame filter press, the ore is finely ground by a wet ball mill and the slurry is transported to the first cyclone, the slurry is classified at the first cyclone and forms corresponding underflow slurry and overflow slurry, the underflow slurry of the first cyclone is unqualified coarse-grained slurry, the underflow slurry of the first cyclone is refluxed to the wet ball mill for fine grinding again, the overflow slurry of the first cyclone is qualified fine-grained slurry, the overflow slurry of the first cyclone enters the second cyclone through a slurry pipeline for desludging, the classification granularity of the second cyclone is smaller than the classification granularity of the first cyclone, the slurry is classified and concentrated again in the second cyclone and forms corresponding underflow slurry and overflow slurry, the underflow slurry of the second cyclone The slurry enters the disc filter for filtration and forms a first filter cake. The overflow slurry of the second cyclone enters the concentration tank mechanism and forms corresponding underflow slurry and overflow liquid through concentration. The underflow slurry of the concentration tank mechanism enters the plate and frame filter press for filtration and forms a second filter cake. The filtration system for wet fine grinding of external ore provided in the present application classes the slurry output by the wet fine grinding of external ore into coarse-grained slurry and fine-grained slurry. The coarse-grained slurry can be filtered by a conventional disc filter to ensure low filtration moisture due to its coarse particle size. The fine-grained slurry can be filtered by a conventional filter press to reduce filtration moisture. At the same time, due to the small amount of fine-grained slurry, the workload of the filter press is reduced, so that the intermittent operation of the filter press will not have a negative impact on the overall filtration efficiency, thereby achieving the purpose of reducing filtration moisture and improving filtration effect when filtering the fine-grinded external ore to prepare pelletized ore. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for describing the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention.

[0019] Figure 1 This is a structural block diagram of a filtration system for wet fine grinding of external ore provided in this application.

[0020] Figures are marked: 100 - first cyclone, 110 - first underflow slurry, 120 - first overflow slurry, 200 - second cyclone, 210 - second underflow slurry, 220 - second overflow slurry, 300 - concentrating tank mechanism, 310 - third underflow slurry, 320 - third overflow liquid, 400 - disc filter, 500 - plate and frame filter press, 600 - mixing equipment, 20 - wet ball mill. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0022] In addition, the present application may repeat reference numbers and / or reference letters in different examples, and such repetition is for the purpose of simplicity and clarity, and does not in itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present application provides various specific examples of processes and materials, but those of ordinary skill in the art may recognize the application of other processes and / or the use of other materials.

[0023] The present application embodiment provides a filtration system for wet fine grinding of external ore, hereinafter referred to as the filtration system, please refer to Figure 1 The filtration system includes a first cyclone 100, a second cyclone 200, a concentration tank mechanism 300, a disc filter 400 and a plate and frame filter press 500.

[0024] The cyclone is a grading device that uses centrifugal force to accelerate the sedimentation of ore particles. Under the action of pressure, the slurry is fed into the cyclone along the feed pipe, and then rotates under the restriction of the cylindrical wall; the coarse particles are thrown to the wall due to the large inertial centrifugal force, and gradually flow downward and are discharged from the bottom to become sediment; the fine particles move toward the wall at a lower speed, and are driven by the liquid flowing toward the center to flow out from the central overflow pipe to become overflow.

[0025] The filtering system of the present application is used in the filtering process of finely grinding external ore to prepare pelletized ore. The filtering system of the present application is used in conjunction with a wet ball mill 20. The filtering system of the present application is explained below in the process sequence.

[0026] In the field of fine grinding of external ore to prepare pelletized ore, the raw material of fine grinding of external ore is mainly imported sintered powder ore, which is mainly a mixed mineral of limonite and hematite. The wet ball mill 20 crushes the ore and then pulverizes it. The ground ore is discharged from the wet ball mill 20 in the form of slurry. Please refer to Figure 1 The ore pulp enters the first cyclone 100 from the ore feeding port of the first cyclone 100, and the ore feeding port of the first cyclone 100 is used to receive the ore pulp output by the wet ball mill 20 through wet fine grinding of external ore.

[0027] Then, the slurry is classified at the first cyclone 100 to form a first underflow slurry 110 and a second overflow slurry 220. The first underflow slurry 110 is an unqualified coarse-grained slurry. The underflow port of the first cyclone 100 is used to communicate with the wet ball mill 20, so that the first underflow slurry 110 flows back to the wet ball mill 20 for fine grinding again. The first overflow slurry 120 is classified by the first cyclone 100 to obtain a qualified fine-grained slurry. The overflow slurry of the first cyclone 100 enters the second cyclone 200 through the slurry pipeline for desludging.

[0028] The classification particle size of the second cyclone 200 is smaller than that of the first cyclone 100. The feed port of the second cyclone 200 is connected to the overflow port of the first cyclone 100. The first overflow slurry 120 enters the second cyclone 200 and is reclassified and concentrated in the second cyclone 200 to form corresponding underflow slurry and overflow slurry, which correspond to Figure 1 The second underflow slurry 210 and the second overflow slurry 220 in the disc filter 400 are connected to the underflow port of the second cyclone 200, and the second underflow slurry 210 enters the disc filter 400 for filtration and forms a first filter cake.

[0029] Please refer to Figure 1 The inlet of the concentrator mechanism 300 is connected to the overflow port of the second cyclone 200, and the second overflow slurry 220 enters the concentrator mechanism 300, and through the concentrating effect of the concentrator mechanism 300, the corresponding underflow slurry and overflow liquid are formed, corresponding to Figure 1 The third underflow slurry 310 and the third overflow liquid 320 in the plate and frame filter press 500 are connected to the underflow port of the concentrator mechanism 300, and the third underflow slurry 310 enters the plate and frame filter press 500 for filtration and forms a second filter cake.

[0030] As described above, the filtration system for wet fine-grinding external ore provided in the present application can classify the slurry output by the wet fine-grinding external ore into coarse-grained slurry and fine-grained slurry. The coarse-grained slurry can be filtered by a conventional disc filter 400 to ensure low filtration moisture due to its coarse particle size, and the fine-grained slurry can be filtered by a conventional filter press to reduce the filtration moisture. At the same time, due to the small amount of fine-grained slurry, the workload of the filter press is reduced, so that the intermittent operation of the filter press will not have a negative impact on the overall filtration efficiency, thereby achieving the purpose of reducing the filtration moisture and improving the filtration effect when filtering the fine-grinding external ore to prepare pelletized ore.

[0031] In some embodiments, see Figure 1The filtration system further includes a mixing device 600, which is opposite to the disc filter 400 and the plate and frame filter press 500. The mixing device 600 is used to receive the first filter cake output by the disc filter 400 and the second filter cake output by the plate and frame filter press 500, and the mixing device 600 is used to mix the first filter cake and the second filter cake in a proportion, and the proportion is the ratio of the ore content contained in the second underflow slurry 210 output from the underflow port of the second cyclone 200 to the ore content contained in the second overflow slurry 220 output from the overflow port of the second cyclone 200.

[0032] In detail, comparing the second underflow pulp 210 with the second overflow pulp 220, the second underflow pulp 210 is a coarse-grained pulp, the second overflow pulp 220 is a fine-grained pulp, and the amount of the second overflow pulp 220 is less than that of the second underflow pulp 210. If the ore content in the second overflow pulp 220 is determined as unit 1 and the ore content in the second underflow pulp 210 is determined as unit n, then the above ratio is n: 1. The first filter cake and the second filter cake are mixed by the mixing device 600 using the above ratio to obtain the final filter cake product, so that the material ratio in the final filter cake product is close to the material ratio of the external ore raw material finely ground by the wet ball mill 20 at the beginning, which has outstanding practicality in practical applications.

[0033] In some embodiments, the mixing device 600 may be a conveyor belt device, and the first filter cake and the second filter cake are transported to the conveyor belt device via a belt according to the above ratio. The conveyor belt device may be understood as a final product belt.

[0034] In actual work, it is necessary to measure the above-mentioned ratio, that is, to measure the ratio of the ore content contained in the second underflow slurry 210 to the ore content contained in the second overflow slurry 220. In some embodiments, the filtration system also includes a measuring ratio component, and the value of the above-mentioned ratio is obtained by measuring the ratio component. The measuring ratio component includes a flow measuring component and a concentration measuring component. The flow measuring component is used to measure the flow of the underflow slurry and the overflow slurry output by the second cyclone 200, respectively. The concentration measuring component is used to measure the ore concentration of the underflow slurry and the overflow slurry output by the second cyclone 200, respectively. The concentration measuring component can be used to measure the sampling method.

[0035] In actual work, the inventors have measured that based on the fact that the finely ground external ore raw materials are mainly imported sintered powder ore and this type of ore is mainly a mixed mineral of limonite and hematite, the above ratio is controlled within the range of 5 to 7, that is, within the range of 5:1-7:1, including the two endpoint values ​​of 5:1 and 7:1, to meet actual production needs.

[0036] In some embodiments, see Figure 1The overflow port of the concentration tank mechanism 300 is used to be connected to the water inlet of the wet ball mill 20, so that the overflow liquid output from the overflow port of the concentration tank mechanism 300 can be returned to the water inlet of the wet ball mill 20 as supplementary water when the wet ball mill 20 performs wet fine grinding, which can save the water consumption of the wet ball mill 20.

[0037] In some embodiments, the concentrator mechanism 300 is a deep cone concentrator, which is a body with a cylindrical upper portion and a conical lower portion. The working principle of the deep cone concentrator is as follows: under the condition of adding flocculants, the slurry is fed into the feed barrel with a conical distribution port at the lower portion, and most of the water in the slurry flows to the periphery in the clarification area of ​​the cylindrical part of the concentrator and overflows to form the above-mentioned third overflow liquid 320, which corresponds to the overflow port of the concentrator mechanism 300, and a small part of the water forms a small vortex in the floc sedimentation area; in the conical part of the body, i.e., the compression area, the precipitate is compressed under the action of gravity, and is discharged from the bottom flow port or pumped out by a pump, forming the above-mentioned third bottom flow slurry 310.

[0038] The deep cone thickening tank is equipped with a flocculant adding device, through which flocculants are added into the tank. An overflow turbidity meter is installed at the overflow port of the deep cone thickening tank, and the turbidity of the third overflow liquid 320 is detected by the overflow turbidity meter. In practical applications, the flow of the third overflow liquid 320 is controlled by using the detection data of the overflow turbidity meter, and a control valve for controlling the flow is correspondingly provided on the connecting pipeline between the overflow port of the thickening tank mechanism 300 and the water inlet of the wet ball mill 20. When the turbidity of the third overflow liquid 320 exceeds the requirement, the flow of the third overflow liquid 320 entering the wet ball mill 20 is reduced, and the minerals in the slurry continue to precipitate until the turbidity of the third overflow liquid 320 is reduced, or additional measures are taken to rapidly reduce the turbidity of the third overflow liquid 320, and then the flow of the third overflow liquid 320 entering the wet ball mill 20 is increased.

[0039] In some embodiments, the disc filter 400 and the plate and frame filter press 500 are respectively provided with filtered water outlets, and the filtered water outlets of the disc filter 400 and the plate and frame filter press 500 are both used to connect with the water inlet of the wet ball mill 20, so as to return the filtered water outputted from the filtered water outlets of the disc filter 400 and the plate and frame filter press 500 to the water inlet of the wet ball mill 20, thereby further reducing the water consumption of the wet ball mill 20.

[0040] The finely ground foreign ore raw materials are mainly imported sintered powder ore, which is mainly a mixed mineral of limonite and hematite. Based on this basic industry situation, the inventor further designed the application scheme of the filtration system as follows.

[0041] After the imported sintered powder ore is finely ground by the wet ball mill 20, the ore particle size is -200 mesh accounting for 75%-85%, and -325 mesh accounting for 30%-40%. The higher the mesh number, the more holes there are, which means the smaller the particle size. -200 mesh means that the ore with a size smaller than 200 mesh is screened out (-200 mesh accounts for 75%, which means that the sieve with a size of 200 mesh is used to screen out the proportion of the ore with a size smaller than 200 mesh in the total ore), and the same is true for -325 mesh. During the operation of the filtration system of the present application, the concentration of the first overflow slurry 120 is 20%-30%, the selection requirement of the first cyclone 100 is a diameter of 200mm-500mm, the selection requirement of the second cyclone 200 is a diameter <125mm, the concentration of the second underflow slurry 210 reaches 55%-65%, the proportion of ore of -325 mesh in the second underflow slurry 210 is reduced to less than 5%, the concentration of the second overflow slurry 220 reaches 10%-20%, the ore particle size in the second overflow slurry 220 can reach 325-800 mesh, and the yield of ore below the classification particle size of the second cyclone 200 is 15%-25%.

[0042] Based on the above situation, the disc filter 400 is a conventional vacuum disc filter 400, and the equipment specifications are selected according to the actual production capacity. The filtration time of the disc filter 400 is 3-5min, the vacuum degree is 0.05MPa-0.07MPa, the filter cake thickness of the first filter cake obtained is 8mm-15mm, and the moisture content of the first filter cake obtained can reach 12.5%-13.5%. The concentration of the third underflow slurry 310 output by the concentration tank mechanism 300 is 50%-60%, the working pressure of the plate and frame filter press 500 is 0.5MPa-0.6MPa, the filter cake thickness of the second filter cake obtained is 30mm-40mm, and the moisture content of the second filter cake after filtration can reach 12%-13.6%.

[0043] Then, the first filter cake and the second filter cake are respectively joined to the final product belt through the belt, and the mixing ratio of the first filter cake and the second filter cake is controlled within the range of 5:1-7:1 to obtain the final filtered product.

[0044] Here, a possible implementation of the filtration system is provided as a supplementary explanation to the above range. Specifically, the diameter of the first cyclone 100 is 300 mm, the classification particle size of the first cyclone 100 is 75 μm, the ore particle size of the first overflow slurry 120 reaches -200 mesh accounting for 80%, -325 mesh accounting for 30%, the diameter of the second cyclone 200 is 70 mm, the classification particle size of the second cyclone 200 is 40 μm, the concentration of the second underflow slurry 210 is 60%, the concentration of the second overflow slurry 220 is 20%, the -40 μm particle size yield accounts for 16.5%, the filtration time of the disc filter 400 is 3 min, and the disc filter 400 has a filtering time of 3 min. The vacuum degree of the filter 400 is 0.07MPa, the thickness of the obtained first filter cake is 10mm, and the moisture content of the obtained first filter cake is 12.8%. The concentration tank mechanism 300 selects a deep cone concentrator, the concentration of the third underflow slurry 310 is 55%, the working pressure of the plate and frame filter press 500 is 0.6MPa, and the thickness of the obtained second filter cake is 40mm. The moisture content of the filter cake after filtration can reach 13.0%. The first filter cake and the second filter cake are mixed at a ratio of 5:1 on the conveyor belt to form a final filtered product.

[0045] It should be noted that the above involves multiple concentrations. Concentration refers to the proportion of a substance in the total amount. In this application, slurry concentration refers to the mass proportion of ore in the slurry.

[0046] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0047] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0048] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A filtration system for wet fine grinding of external ore, characterized in that: The filtration system comprises: A first cyclone, wherein the ore feeding port of the first cyclone is used to receive the ore pulp output by the wet ball mill through wet fine grinding of external ore, and the bottom flow port of the first cyclone is used to communicate with the wet ball mill; a second cyclone, wherein the classification particle size of the second cyclone is smaller than the classification particle size of the first cyclone, and the feed port of the second cyclone is connected to the overflow port of the first cyclone; a concentrator mechanism, wherein the inlet of the concentrator mechanism is connected to the overflow port of the second cyclone; a disc filter, the inlet of which is in communication with the underflow port of the second cyclone; A plate and frame filter press, wherein the inlet of the plate and frame filter press is connected to the underflow port of the concentrator mechanism.

2. The filtration system for wet fine grinding of external ore according to claim 1, characterized in that: The filtration system further comprises: A mixing device, opposite to the disc filter and the plate and frame filter press, is used to receive the first filter cake output by the disc filter and the second filter cake output by the plate and frame filter press, and is used to mix the first filter cake and the second filter cake in a proportion, wherein the proportion is the ratio of the ore content contained in the underflow slurry output by the underflow port of the second cyclone to the ore content contained in the overflow slurry output by the overflow port of the second cyclone.

3. The filtration system for wet fine grinding of external ore according to claim 2, characterized in that: The filtration system further comprises: A measuring proportion component is used to obtain the numerical value of the proportion. The measuring proportion component includes a flow measuring component and a concentration measuring component. The flow measuring component and the concentration measuring component respectively measure the flow and ore concentration of the underflow slurry and the overflow slurry output by the second cyclone.

4. The filtration system for wet fine grinding of external ore according to claim 2, characterized in that: The ratio is 5 to 7.

5. The filtration system for wet fine grinding of external ore according to claim 1, characterized in that: The overflow port of the concentration tank mechanism is used to communicate with the water inlet of the wet ball mill so as to return the overflow liquid output from the overflow port of the concentration tank mechanism to the water inlet of the wet ball mill.

6. The filtration system for wet fine grinding of external ore according to claim 5, characterized in that: The concentrator mechanism is a deep cone concentrator, which is equipped with a flocculant adding device. An overflow turbidity meter is installed at the overflow port of the deep cone concentrator, and the overflow turbidity meter is used to detect the turbidity of the overflow liquid output from the overflow port of the deep cone concentrator.

7. The filtration system for wet fine grinding of external ore according to claim 5, characterized in that: The disc filter and the plate-frame filter press are respectively provided with filtered water outlets, and the filtered water outlets of the disc filter and the plate-frame filter press are both used to be connected with the water inlet of the wet ball mill, so as to return the filtered water outputted from the filtered water outlets of the disc filter and the plate-frame filter press to the water inlet of the wet ball mill.

8. The filtration system for wet fine grinding of external ore according to any one of claims 1 to 7, characterized in that: On the basis that the finely ground ore of the wet ball mill is composed of limonite and hematite, the ore particle size in the slurry output by the wet fine grinding of external ore is -200 mesh accounting for 75%-85% and -325 mesh accounting for 30%-40%, the selection requirement of the first cyclone is 200mm-500mm in diameter, and the selection requirement of the second cyclone is <125mm in diameter.

9. The filtration system for wet fine grinding of external ore according to claim 8, characterized in that: The classification particle size of the first cyclone is 75 μm, and the classification particle size of the second cyclone is 40 μm.

10. The filtration system for wet fine grinding of external ore according to claim 8, characterized in that: The moisture content of the first filter cake output by the disc filter is 12.5%-13.5%, and the moisture content of the second filter cake output by the plate and frame filter press is 12%-13.6%.

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