Filter press device for phosphate concentrate

Abstract

Disclosed in the present invention is a filter press device for a phosphate concentrate. The filter press device comprises a filter press mechanism, an angle adjustment mechanism and a knocking mechanism, wherein the filter press mechanism comprises a plurality of filter plates and a plurality of filter cloths, with all the filter plates being arranged vertically and in parallel and being movable in a horizontal plane, such that the filter plates are in a mutually abutting or mutually separated state, and the filter cloths being arranged on two sides of the corresponding filter plates; the angle adjustment mechanism is detachably fixedly connected to all the filter plates that are in the mutually separated state, and is configured to drive all the filter plates to swing synchronously, thereby adjusting the inclination angles of the filter plates; and the knocking mechanism is configured to knock the filter plates swinging to the highest position. The present invention has the following beneficial effects: by means of knocking each filter plate by using the knocking mechanism, phosphate concentrate powder adhering to the filter cloths falls off, thereby improving the discharge effect and ensuring the production efficiency; and there is no longer any need for workers to use brushes to brush off the phosphate concentrate powder adhering to the filter cloths.

Description

Phosphorus concentrate filter device TECHNICAL FIELD

[0001] The present application relates to the technical field of phosphoric acid production, and particularly relates to a phosphorus concentrate filter device. BACKGROUND

[0002] The concentrate produced by the mineral processing flotation process contains a large amount of water, and generally needs to remove the water to continue processing (such as smelting). First, from the perspective of transportation, the concentrate product must be dewatered, otherwise it will not only cause transportation difficulties, but also greatly increase the transportation cost. Secondly, from the perspective of metallurgy, concentrate dewatering is also very important to the metallurgical industry. A large amount of water in the concentrate not only greatly increases the smelting energy consumption and smelting cost, but also significantly reduces the utilization coefficient of the metallurgical furnace. Overall, it greatly reduces the economic benefit of smelting. In addition, with the gradual promotion of green mine construction in China, from the perspective of energy saving and emission reduction, it is also necessary to dewater the mineral processing products to realize the recycling of water resources. Not only can the water consumption be reduced, but also the amount of mineral processing reagents can be appropriately reduced, thereby reducing the cost of mineral processing to a certain extent.

[0003] In the production process of phosphoric acid, phosphorus ore slurry and concentrated sulfuric acid are simultaneously added to the reaction tank to react to generate phosphogypsum and dilute phosphoric acid. The water in the phosphorus ore slurry also enters the reaction tank. The lower the solid content of the phosphorus ore slurry, the more water is brought into the reaction tank. The more water brought into the reaction tank, the less return acid enters the reaction tank. The less return acid enters the reaction tank, the less filter washing water. The less filter washing water, the higher the water-soluble P2O5 content in the phosphogypsum, and the greater the filtration loss. In order to reduce the filtration loss, reduce the production cost, and improve the economic benefit, it is necessary to use a filter device to concentrate the phosphorus ore slurry and increase the solid content of the slurry.

[0004] The existing filter press (such as the phosphorus concentrate grading and concentrating metering system disclosed in application No. 202410073982.0) is used for phosphorus ore slurry filtration. The filter plates are pressed against each other, and filter chambers are formed between adjacent filter plates. The filter cloth retains the solid particles in the phosphorus ore slurry during filtration, and forms filter cake in the filter chamber. The filtrate passes through the filter cloth and is discharged from the filter chamber to achieve solid-liquid separation. After filtration, the filter plates are pulled apart to unload the cake. When unloading the cake, part of the phosphorus concentrate powder will adhere to the filter cloth and cannot fall normally. Workers need to use a brush to brush off the phosphorus concentrate powder adhering to the filter cloth, which affects the production efficiency.

[0005] SUMMARY

[0006] The present application aims to overcome the above technical deficiencies and provides a phosphorus concentrate filter device to solve the technical problem that part of the phosphorus concentrate powder will adhere to the filter cloth and cannot fall normally when the filter press unloads the cake in the prior art.

[0007] To achieve the above technical purposes, the technical scheme of the present application provides a phosphate concentrate filter device, comprising:

[0008] The filter mechanism comprises a plurality of filter plates and a plurality of filter cloths, each of the filter plates is vertically and parallelly arranged, each of the filter plates can move in a horizontal plane, so that each of the filter plates is in a mutual abutting or mutual separating state, and each of the filter cloths is arranged on both sides of the corresponding filter plate;

[0009] The angle adjusting mechanism is detachably fixed with each of the filter plates in the mutual separating state, and is used for driving each of the filter plates to synchronously swing, so as to adjust the inclination angle of each of the filter plates.

[0010] The knocking mechanism is used for knocking each of the filter plates swung to the highest position.

[0011] Further, the phosphate concentrate filter device further comprises a rack, and each of the filter plates is slidingly arranged on the rack.

[0012] Further, two guide grooves extending along the moving direction of the filter plates are oppositely arranged on the rack, and the filter mechanism further comprises a plurality of guide shafts, each of the guide shafts is horizontally fixed on the corresponding filter plate, and both ends of the guide shaft are slidingly arranged in the corresponding guide groove.

[0013] Further, the angle adjusting mechanism has two, and the two angle adjusting mechanisms are arranged on both sides of each of the filter plates and are detachably fixed with the end of each of the guide shafts, and are used for driving each of the guide shafts to synchronously rotate forward or reversely around the axis thereof.

[0014] Further, a polygonal hole is arranged at each end of the guide shaft, the angle adjusting mechanism comprises a connecting roller, a first driving assembly and a second driving assembly, each of the connecting rollers corresponds to each of the filter plates in the mutual separating state, one end of the connecting roller close to the filter plate is matched with the hole, the first driving assembly is connected with each of the connecting rollers, and is used for driving each of the connecting rollers to synchronously rotate forward or reversely around the axis thereof, and the second driving assembly is connected with the first driving assembly, and is used for driving the first driving assembly to move along the direction perpendicular to the moving direction of the filter plate, so that one end of each of the connecting rollers close to the filter plate enters or moves out of the corresponding hole.

[0015] Further, the first driving assembly comprises a bottom rod, a rack, a plurality of mounting plates, a plurality of gears and a first telescopic driving member, the bottom rod is horizontally slidably arranged on the frame along the moving direction of the filter plate and is movable along a direction perpendicular to the moving direction of the filter plate, the rack is slidably arranged on the bottom rod, each mounting plate is fixedly arranged on the bottom rod along the length direction of the bottom rod, each connecting roller is rotatably arranged on the corresponding mounting plate away from the filter plate, each gear is fixedly sleeved on the corresponding connecting roller and is engaged with the rack, and the first telescopic driving member is fixedly arranged on the bottom rod, the output end of the first telescopic driving member is fixedly connected with the rack, and the first telescopic driving member is used for driving the rack to reciprocate along the length direction of the bottom rod.

[0016] Further, the second driving assembly comprises a second telescopic driving member, the output end of the second telescopic driving member is fixedly connected with the bottom rod, and the second telescopic driving member is used for driving the bottom rod to move along a direction perpendicular to the moving direction of the filter plate.

[0017] Further, the knocking mechanism comprises a rotating shaft, a plurality of knocking members and a rotating driving member, the rotating shaft is horizontally arranged along the moving direction of the filter plate, each knocking member corresponds to each filter plate swinging to the highest position, one end of the knocking member is connected with the rotating shaft, the other end of the knocking member is used for knocking the side wall of the filter plate, and the rotating driving member is fixedly connected with one end of the rotating shaft and is used for driving the rotating shaft to rotate.

[0018] Further, the knocking member comprises a fixed rod, a movable rod and a knocking ball, one end of the fixed rod is fixedly connected with the rotating shaft, one end of the movable rod is hingedly connected with the other end of the fixed rod, and the knocking ball is hingedly connected with the other end of the movable rod.

[0019] Further, two opposite side walls of the filter plate are provided with a filter groove, the filter plate is provided with a feeding hole communicated with the two filter grooves, the side wall of the filter plate is provided with two drainage holes communicated with the corresponding filter grooves, and each filter cloth is wrapped on the surface of the corresponding filter groove and avoids the feeding hole.

[0020] Compared with the prior art, the beneficial effects of the present application include: in use, each filter plate moves in the horizontal plane and abuts against each other, a filter chamber is formed between adjacent filter plates, the phosphate ore slurry enters each filter chamber, the filter cloth retains the solid particles in the phosphate ore slurry during filter pressing, a filter cake is formed in the filter chamber, the filtrate passes through the filter cloth and is discharged from the filter chamber, realizing solid-liquid separation, after filter pressing, each filter plate moves in the horizontal plane and is separated from each other, the phosphate concentrate filter cake in the filter chamber falls under the action of gravity, realizing cake unloading, when each filter plate is in a separated state, the angle adjusting mechanism is detachably fixed with each filter plate, by controlling the angle adjusting mechanism, each filter plate is driven to swing synchronously, so that the inclination angle of each filter plate can be adjusted, so that each filter plate is in an inclined state, when each filter plate is swung to the highest position, the knocking mechanism can knock each filter plate, so that the phosphate concentrate powder adhering to the filter cloth falls, improving the unloading effect and ensuring the production efficiency, and workers no longer need to use a brush to brush the phosphate concentrate powder adhering to the filter cloth. BRIEF DESCRIPTION OF DRAWINGS

[0021] Fig. 1 is a perspective structural schematic view of a phosphate concentrate filter pressing device provided by the present application;

[0022] Fig. 2 is a perspective structural schematic view of a phosphate concentrate filter pressing device in Fig. 1 when each filter plate is in an inclined state;

[0023] Fig. 3 is an enlarged view of A in Fig. 1;

[0024] Fig. 4 is an enlarged view of B in Fig. 2;

[0025] Fig. 5 is a perspective structural schematic view of the connection relationship between a filter plate, filter cloth and guide shaft of a phosphate concentrate filter pressing device in Fig. 1;

[0026] Fig. 6 is a sectional view of the connection relationship between a filter plate, filter cloth and guide shaft of a phosphate concentrate filter pressing device in Fig. 5;

[0027] In the drawings: 100 - filter pressing mechanism, 110 - filter plate, 111 - filter groove, 112 - feeding hole, 113 - drainage hole, 114 - air pressure cavity, 115 - air inlet hole, 116 - overflow hole, 117 - air outlet hole, 120 - filter cloth, 130 - guide shaft, 131 - flower hole, 140 - thrust plate, 141 - material injection hole, 142 - air injection hole, 150 - pressing plate, 200 - angle adjusting mechanism, 210 - connecting roller, 220 - first driving assembly, 221 - bottom rod, 2211 - first sliding groove, 222 - rack, 223 - mounting plate, 224 - gear, 225 - first telescopic driving piece, 230 - second driving assembly, 231 - second telescopic driving piece, 300 - knocking mechanism, 310 - rotating shaft, 320 - knocking piece, 321 - fixed rod, 322 - movable rod, 323 - knocking ball, 330 - rotating driving piece, 400 - rack, 410 - guide groove, 420 - second sliding groove. DETAILED DESCRIPTION

[0028] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and should not be used to limit the present application.

[0029] The present application provides a phosphate concentrate filter press, which has the structure as shown in FIG. 1-6, comprising a filter press mechanism 100, an angle adjusting mechanism 200 and a knocking mechanism 300, the filter press mechanism 100 comprises a plurality of filter plates 110 and a plurality of filter cloths 120, each of the filter plates 110 is vertically and parallel arranged, each of the filter plates 110 can move in the horizontal plane, so that each of the filter plates 110 is in the state of abutting against each other or being separated from each other, and each of the filter cloths 120 is arranged on both sides of the corresponding filter plate 110; the angle adjusting mechanism 200 is detachably fixed with each of the filter plates 110 in the state of being separated from each other, for driving each of the filter plates 110 to swing synchronously, so as to adjust the inclination angle of each of the filter plates 110; the knocking mechanism 300 is used for knocking each of the filter plates 110 which swings to the highest position.

[0030] In use, each of the filter plates 110 moves in the horizontal plane and abuts against each other, the filter chambers are formed between the adjacent filter plates 110, the phosphate ore slurry enters each of the filter chambers, the filter cloths 120 retain the solid particles in the phosphate ore slurry during the filter pressing, the filter cake is formed in the filter chamber, the filtrate passes through the filter cloths 120 and is discharged from the filter chamber, so as to realize the solid-liquid separation, after the filter pressing, each of the filter plates 110 moves in the horizontal plane and is separated from each other, the phosphate concentrate filter cake in the filter chamber falls under the action of gravity, so as to realize the cake discharge, when each of the filter plates 110 is in the state of being separated from each other, the angle adjusting mechanism 200 is detachably fixed with each of the filter plates 110, by controlling the angle adjusting mechanism 200, each of the filter plates 110 is driven to swing synchronously, so as to adjust the inclination angle of each of the filter plates 110, so that each of the filter plates 110 is in the state of being inclined, when each of the filter plates 110 swings to the highest position, each of the filter plates 110 can be knocked by the knocking mechanism 300, so that the phosphate concentrate powder adhered to the filter cloths 120 falls, which improves the discharging effect and ensures the production efficiency, and workers no longer need to use a brush to brush the phosphate concentrate powder adhered to the filter cloths 120.

[0031] As a preferred embodiment, referring to FIG. 1, the phosphate concentrate filter press further comprises a rack 400, each of the filter plates 110 is slidingly arranged on the rack 400, and each of the filter plates 110 can be supported.

[0032] As a preferred embodiment, please refer to FIG. 1 and FIG. 2, two guiding grooves 410 are oppositely arranged on the frame 400, and each of the guiding grooves 410 extends along the moving direction of the filter plate 110. The filter press 100 further comprises a plurality of guiding shafts 130, each of which is horizontally fixed on the corresponding filter plate 110, and the two ends of each guiding shaft 130 are respectively slidably arranged in the corresponding guiding groove 410. The movement of each filter plate 110 can be guided by the guiding groove, so that each filter plate 110 can rotate around the rotation shaft 310 when moving along the length direction of the guiding groove 410.

[0033] As a preferred embodiment, please refer to FIG. 3 and FIG. 4, the angle adjusting mechanism 200 is arranged on both sides of each filter plate 110, and is detachably connected with the end of each guiding shaft 130. The angle adjusting mechanism 200 is used to drive each guiding shaft 130 to synchronously rotate around its axis in a forward direction or a reverse direction, so as to realize the swing of the filter plate 110 and improve the driving effect of the filter plate 110.

[0034] As a preferred embodiment, please refer to FIG. 3 and FIG. 4, the two ends of the guiding shaft 130 are respectively provided with a polygonal hole 131. The angle adjusting mechanism 200 comprises a connecting roller 210, a first driving assembly 220 and a second driving assembly 230. Each connecting roller 210 corresponds to each filter plate 110 in a separated state. The end of the connecting roller 210 close to the filter plate 110 is matched with the polygonal hole 131. The first driving assembly 220 is connected with each connecting roller 210, and is used to drive each connecting roller 210 to synchronously rotate around its axis in a forward direction or a reverse direction. The second driving assembly 230 is connected with the first driving assembly 220, and is used to drive the first driving assembly 220 to move along a direction perpendicular to the moving direction of the filter plate 110, so as to make the end of each connecting roller 210 close to the filter plate 110 enter or move out of the corresponding polygonal hole 131. When each filter plate 110 is in a separated state, the second driving assembly 230 is controlled to drive the first driving assembly 220 to move along a direction perpendicular to the moving direction of the filter plate 110, so as to make the end of each connecting roller 210 close to the filter plate 110 enter the corresponding polygonal hole 131, and realize the connection with the guiding shaft 130. Then, the first driving assembly 220 is controlled to drive each connecting roller 210 to synchronously rotate around its axis in a forward direction or a reverse direction, and drive each guiding shaft 130 to synchronously rotate around its axis in a forward direction or a reverse direction, so as to realize the synchronous swing of each filter plate 110, and adjust the inclination angle of each filter plate 110.

[0035] As a preferred embodiment, please refer to FIG. 2 and FIG. 3, the first driving assembly 220 comprises a bottom bar 221, a rack 222, a plurality of mounting plates 223, a plurality of gears 224 and a first telescopic driving member 225, the bottom bar 221 is horizontally slidably arranged on the rack 400 along the moving direction of the filter plate 110 and can move along the direction perpendicular to the moving direction of the filter plate 110, the rack 222 is slidably arranged on the bottom bar 221, each mounting plate 223 is fixedly arranged on the bottom bar 221 along the length direction of the bottom bar 221, each connecting roller 210 is rotatably arranged on the corresponding mounting plate 223 away from the filter plate 110, each gear 224 is fixedly sleeved on the corresponding connecting roller 210 and engaged with the rack 222, the first telescopic driving member 225 is fixedly arranged on the bottom bar 221, the output end of the first telescopic driving member 225 is fixedly connected with the rack 222 for driving the rack 222 to reciprocate along the length direction of the bottom bar 221, by controlling the first telescopic driving member 225, the first telescopic driving member 225 can drive the rack 222 to reciprocate along the length direction of the bottom bar 221, in the process of reciprocating along the length direction of the bottom bar 221, the rack 222 drives each gear 224 to synchronously rotate forward or reversely, and drives each connecting roller 210 to synchronously rotate forward or reversely around the axis thereof.

[0036] As a preferred embodiment, please refer to FIG. 3 and FIG. 4, the bottom bar 221 is provided with a first sliding groove 2211 extending along the length direction of the bottom bar 221, the rack 222 is slidably arranged in the first sliding groove 2211, and the movement of the rack 222 can be guided by the first sliding groove 2211.

[0037] As a preferred embodiment, please refer to FIG. 3 and FIG. 4, the rack 400 is provided with at least two second sliding grooves 420, each second sliding groove 420 extends along the direction perpendicular to the moving direction of the filter plate 110, the first driving assembly 220 further comprises at least two sliding blocks, each sliding block is fixedly connected with the bottom bar 221 and slidably arranged in the corresponding second sliding groove 420, and the movement of the bottom bar 221 can be guided by the second sliding groove 420.

[0038] As a preferred embodiment, please refer to FIG. 2, the second driving assembly 230 comprises a second telescopic driving member 231, an output end of the second telescopic driving member 231 is fixedly connected with the bottom rod 221, and is used to drive the bottom rod 221 to move along a direction perpendicular to the moving direction of the filter plate 110. By controlling the second telescopic driving member 231, the second telescopic driving member 231 can drive the bottom rod 221 to move along a direction perpendicular to the moving direction of the filter plate 110, so that each connecting roller 210 approaches one end of the filter plate 110 into or moves out of the corresponding flower hole 131.

[0039] As a preferred embodiment, please refer to FIG. 2 and FIG. 3, the knocking mechanism 300 comprises a rotating shaft 310, a plurality of knocking members 320 and a rotating driving member 330. The rotating shaft 310 is horizontally arranged along the moving direction of the filter plate 110. Each knocking member 320 corresponds to each filter plate 110 which swings to the highest position. One end of the knocking member 320 is connected with the rotating shaft 310, and the other end of the knocking member 320 is used to knock the side wall of the filter plate 110. The rotating driving member 330 is fixedly connected with one end of the rotating shaft 310, and is used to drive the rotating shaft 310 to rotate. There are two highest positions every other filter plate 110, and each filter plate 110 corresponds to two knocking members 320. By controlling the rotating driving member 330, the rotating driving member 330 can drive the rotating shaft 310 to rotate and drive each knocking member 320 to rotate synchronously. During the rotation of the knocking member 320, the side wall of the filter plate 110 is intermittently knocked.

[0040] As a preferred embodiment, please refer to FIG. 3, the knocking member 320 comprises a fixed rod 321, a movable rod 322 and a knocking ball 323. One end of the fixed rod 321 is fixedly connected with the rotating shaft 310. One end of the movable rod 322 is hingedly connected with the other end of the fixed rod 321. The knocking ball 323 is hingedly connected with the other end of the movable rod 322. The structure of the knocking member 320 can improve the knocking effect on the filter plate 110.

[0041] As a preferred embodiment, please refer to FIG. 5 and FIG. 6, two opposite sidewalls of the filter plate 110 are provided with a filter groove 111, the filter plate 110 is provided with a feed hole 112 communicating with the two filter grooves 111, the sidewall of the filter plate 110 is provided with two drainage holes 113 communicating with the corresponding filter grooves 111, each filter cloth 120 is wrapped on the surface of the corresponding filter groove 111, avoiding the feed hole 112, when each filter plate 110 is in the state of abutting against each other, the filter cavities are formed between the adjacent filter grooves 111, each feed hole 112 forms a feed channel, the phosphate ore slurry enters each filter cavity along the feed channel, the filter cloth 120 traps the solid particles in the phosphate ore slurry during filter pressing, forming filter cake in the filter cavity, the filtrate passes through the filter cloth 120 and is discharged from the filter cavity along each drainage hole 113, realizing solid-liquid separation, after filter pressing, each filter plate 110 moves in the horizontal plane and is separated from each other, the phosphate concentrate filter cake in the filter cavity falls under the action of gravity, realizing cake discharge.

[0042] As a preferred embodiment, please refer to FIG. 5 and FIG. 6, the filter plate 110 is also provided with a gas pressure cavity 114, the gas pressure cavity 114 is located between the two filter grooves 111, the filter plate 110 is also provided with an air inlet hole 115 and a flow hole 116, two ends of the flow hole 116 respectively communicate with the gas pressure cavity 114 and the air inlet hole 115, the sidewall of the filter plate 110 is also provided with an exhaust hole 117 communicating with the gas pressure cavity 114, the partition between the gas pressure cavity 114 and the two filter grooves 111 is made of elastic material, when each filter plate 110 is in the state of abutting against each other, each air inlet hole 115 forms an air inlet channel, gas enters each gas pressure cavity 114 along the air inlet channel and each flow hole 116, and the phosphate ore slurry in the filter cavity is extruded.

[0043] As a preferred embodiment, please refer to FIG. 1 and FIG. 2, the filter press mechanism 100 further comprises a thrust plate 140 and a pressing plate 150, the thrust plate 140 is provided with a feeding hole 141 and a gas injection hole 142, the thrust plate 140 and the pressing plate 150 are vertically and spacedly arranged, the thrust plate 140 is fixedly arranged on the rack 400, the pressing plate 150 is slidingly arranged on the rack 400, each filter plate 110 is arranged between the thrust plate 140 and the pressing plate 150, each filter plate 110 and the last filter plate 110 and the pressing plate 150 are connected by a hinge, each feeding hole 112 is coaxial with the feeding hole 141, each gas injection hole 115 is coaxial with the gas injection hole 142, when the thrust plate 140, each filter plate 110 and the pressing plate 150 are in the state of abutting against each other, the phosphorus ore slurry is injected into each filter cavity through the feeding hole 141, and the gas is injected into each gas pressure cavity 114 through the gas injection hole 142.

[0044] As a preferred embodiment, the phosphorus concentrate filter press device further comprises a driving mechanism, the driving mechanism is connected with the pressing plate 150, and is used for driving the pressing plate 150 to move in a horizontal plane, so that the thrust plate 140, each filter plate 110 and the pressing plate 150 are in the state of abutting against each other or being separated from each other, by controlling the driving mechanism, the driving mechanism can drive the pressing plate 150 to move towards the direction of being close to or away from the thrust plate 140, and since each filter plate 110 and the last filter plate 110 and the pressing plate 150 are connected by a hinge, the thrust plate 140, each filter plate 110 and the pressing plate 150 can be abutted against each other or separated from each other.

[0045] As a preferred embodiment, the control of pressure is one of the main factors affecting the filter pressing effect, and the good or bad of the pressure system is directly related to the good or bad of the filter pressing effect. The maximum filter pressure of the filter press device is 0.8 MPa, and the purpose of setting the feeding pressure is mainly to control the length of the feeding time. If the feeding time is too short, the final filter cake is thin and the filtering efficiency is low. If the feeding time is too long, although a relatively thick filter cake and a good filtering effect are ensured, the feeding hole 112 may be blocked, which affects the unloading and increases the labor intensity of workers. After a long time of exploration, it is found that when the feeding pressure is set to 0.6 MPa, the filter cake is thick and the feeding hole 112 is not blocked.

[0046] As a preferred embodiment, the filter pressing speed is one of the main factors affecting the filter pressing effect, and the filter pressing speed of the filter pressing device should be determined according to different factors such as the concentration and resistance of the filtering liquid. The factors affecting the filter pressing speed include the pulp concentration and the pressing time. Generally speaking, the greater the concentration of the feed pulp, the more solid content in the pulp, and the faster the filter pressing speed. The lower the concentration of the feed pulp, the less solid content in the pulp, and the slower the filter pressing speed. Therefore, in order to ensure a reasonable filter pressing speed, it is necessary to reasonably control the concentration of the feed pulp. Therefore, the size of the foam washing water should be controlled according to the amount of the flotation foam scraped off, so as to ensure that the flotation foam product can flow from the flotation machine foam tank to the filter pressing slurry storage barrel (stirring barrel) by gravity. At this time, the concentration of the pulp is between 18% and 20%. The filter pressing time of the filter pressing device is generally set according to the flow rate of the drain hole 113. During the process of pulp filter pressing by the filter pressing device, the pulp continuously passes through the filter cloth 120 for filter pressing, so that the water flows into the drain hole 113, and then flows out through the overflow pipe at the bottom of the filter plate 110. When the filter pressing device is filter pressed for a period of time, the water flow becomes smaller and smaller until it stops. After repeated trials, the optimal pressing time is 160s.

[0047] As a preferred embodiment, the filter cloth 120 selection is a key factor related to the filtering effect and operating cost. The performance of the filter cloth 120 directly affects the filtering effect. The filter cloth 120 selection needs to be selected according to the particle size, density, viscosity, chemical composition of the material and the filtering process conditions. Since the pH value of the filter-pressed concentrate pulp is about 13, an alkali-resistant filter cloth 120 needs to be selected. Commonly used filter cloths 120 include nylon and vinylon. The filter hole of the filter cloth 120 is a key factor in the selection of the filter cloth 120. If the filter hole is too large, it will cause filter leakage, resulting in turbidity of the filtrate, not only causing metal loss, but also making the backwater turbid and increasing the water treatment cost. If the filter hole is too small, it will cause the filter speed to be too slow, and even cause the filter residue to be stuck in the pore size, causing the filter cloth 120 to be blocked, which seriously affects the filter speed and the service life of the filter cloth 120. In addition, the weaving method of the filter cloth 120 will also affect the air permeability of the filter cloth 120 and the cake release property of the filter cake. After comparing a plurality of types of filter cloths 120, the filter cloth 120 of the type of nylon double yarn 750B / (1100x1100x6)mm 500 mesh is finally selected.

[0048] As a preferred embodiment, the filter aid is added to change the size composition of the phosphate concentrate slurry, the filter aid can improve the size composition of the phosphate concentrate slurry by bridging the fine particles, and can reduce the surface tension of the filtrate during the dewatering stage of the filter cake, so that the capillary pressure in the pores of the filter cake is reduced, the tension of the air-water interface during the dewatering stage of the filter cake is reduced, thereby strengthening the dewatering process of the filter cake, improving the efficiency of air-driven filter cake capillary pores in holding the pendulum state water between the residual water and particles, and improving the working condition of the filter pressing system, shortening the discharge cycle of the filter press, and reducing the cost of filter pressing of the flotation concentrate.

[0049] As a preferred embodiment, when the slurry just enters the filter chamber, the impact on the filter chamber is large, and thus the wear of the equipment is also large, which easily causes the slurry spraying phenomenon in the early stage of the slurry. Adjusting the injection pressure curve of the slurry pump can greatly alleviate the slurry spraying phenomenon, that is, when the slurry pump is started, the pressure is slowly increased, and when the filter chamber is clear, the pressure is rapidly increased.

[0050] As a preferred embodiment, the filter-pressed and concentrated mineral powder is mixed with the mining slurry to form a 72% slurry for phosphoric acid production, so as to reduce the water content of the slurry.

[0051] As a preferred embodiment, in order to avoid damage to the equipment during the air drying process, the air inlet is changed from the original air inlet on the filter cloth 120 to the air inlet directly on the filter cake. The drainage hole 113 has a large diameter, which greatly increases the area of the air-dried water outlet. The air outlet hole 117 has a large diameter, which can slow down the airflow speed, so as to reduce the damage to the equipment.

[0052] In order to better understand the present application, the working principle of the technical solution of the present application is described in detail below in combination with FIGS. 1-6:

[0053] In use, the driving mechanism is controlled to drive the pressing plate 150 to move towards the thrust plate 140, so that the thrust plate 140, the filter plate 110 and the pressing plate 150 are in abutting state, the filter chamber is formed between the adjacent filter plates 110, the phosphorus slurry enters the filter chamber through the feed channel, the filter cloth 120 traps the solid particles in the phosphorus slurry during pressure filtration, and the filter cake is formed in the filter chamber, the filtrate passes through the filter cloth 120 and is discharged from the filter chamber through the drain hole 113, so as to realize solid-liquid separation, after pressure filtration, the driving mechanism is controlled to drive the pressing plate 150 to move away from the thrust plate 140, due to the hinge connection between the filter plates 110 and the pressing plate 150, the thrust plate 140, the filter plate 110 and the pressing plate 150 are separated from each other, the phosphate concentrate filter cake in the filter chamber falls under the action of gravity, and the cake is unloaded, when the filter plates 110 are in the separated state, the second telescopic driving element 231 is controlled to drive the bottom rod 221 to move along the direction perpendicular to the moving direction of the filter plate 110, so that one end of the connecting roller 210 close to the filter plate 110 enters the corresponding flower hole 131, and the connecting roller 210 is connected with the guide shaft 130, and then the first telescopic driving element 225 is controlled to drive the rack 222 to reciprocate along the length direction of the bottom rod 221, during the reciprocating movement of the rack 222 along the length direction of the bottom rod 221, the gear 224 is driven to rotate synchronously in the same direction or in the opposite direction, the connecting roller 210 is driven to rotate synchronously in the same direction or in the opposite direction around the axis, and the guide shaft 130 is driven to rotate synchronously in the same direction or in the opposite direction around the axis, so as to realize synchronous swinging of the filter plate 110, so that the inclination angle of the filter plate 110 can be adjusted, and the filter plate 110 is in the inclined state, when the filter plate 110 is swung to the highest position, the rotating driving element 330 is controlled to drive the rotating shaft 310 to rotate, and the knocking element 320 is driven to rotate synchronously, the knocking element 320 rotates intermittently to knock the side wall of the filter plate 110, so that the phosphate concentrate powder adhered to the filter cloth 120 falls, the unloading effect is improved, the production efficiency is ensured, and workers are no longer needed to brush the phosphate concentrate powder adhered to the filter cloth 120.

[0054] The phosphate concentrate pressure filtration device has the following beneficial effects:

[0055] (1) each filter plate 110 can be synchronously swung through the angle adjusting mechanism 200, so that the phosphorus concentrate powder adhered on the filter cloth 120 on both sides of the filter plate 110 can be smoothly dropped;

[0056] (2) when each filter plate 110 is in a mutually separated state, the angle of each filter plate 110 can be adjusted through the angle adjusting mechanism 200, so that each filter plate 110 is in an inclined state, avoiding that the phosphorus concentrate powder adhered on the filter cloth 120 falls into the filter groove 111 during the knocking process, and cannot be smoothly dropped;

[0057] (3) the side wall of the filter plate 110 can be intermittently knocked by the knocking piece 320, so that the phosphorus concentrate powder adhered on the filter cloth 120 is dropped, the unloading effect is improved, the production efficiency is ensured, and workers no longer need to use a brush to brush the phosphorus concentrate powder adhered on the filter cloth 120.

[0058] The specific embodiments of the application described above do not constitute a limitation on the protection scope of the application. Any various other corresponding changes and modifications made according to the technical concept of the application shall be included in the protection scope of the claims of the application.

Claims

1. A filter press for phosphate concentrate, characterized in that, The application relates to a filter press mechanism. The filter press mechanism comprises a plurality of filter plates and a plurality of filter cloths, each of the filter plates is vertically and parallelly arranged, each of the filter plates can move in a horizontal plane to make each of the filter plates in a mutual abutting or mutual separating state, and each of the filter cloths is arranged on the two sides of the corresponding filter plate. An angle adjusting mechanism is detachably fixed with each of the filter plates in the mutual separating state, used for driving each of the filter plates to synchronously swing to adjust the inclination angle of each of the filter plates. A knocking mechanism is used for knocking each of the filter plates swung to the highest position.

2. The phosphate concentrate filter press apparatus of claim 1, wherein, The machine frame is provided with two guide grooves opposite to each other and extending along the moving direction of the filter plates.

3. The phosphate concentrate filter press apparatus of claim 2, wherein, The filter press mechanism further comprises a plurality of guide shafts, each of the guide shafts is horizontally fixed on the corresponding filter plate, and the two ends of the guide shaft are slidably arranged in the corresponding guide groove.

4. The phosphate concentrate filter press apparatus of claim 3, wherein, The angle adjusting mechanism has two, and the two angle adjusting mechanisms are arranged on the two sides of each of the filter plates and are detachably fixed with the end of each of the guide shafts, used for driving each of the guide shafts to synchronously rotate forward or reversely around the axis.

5. The phosphate concentrate filter press apparatus of claim 4, wherein, The two ends of the guide shaft are respectively provided with a polygonal hole, the angle adjusting mechanism comprises a connecting roller, a first driving assembly and a second driving assembly, each of the connecting rollers corresponds to each of the filter plates in the mutual separating state, one end of the connecting roller close to the filter plate is matched with the hole, the first driving assembly is connected with each of the connecting rollers and is used for driving each of the connecting rollers to synchronously rotate forward or reversely around the axis, and the second driving assembly is connected with the first driving assembly and is used for driving the first driving assembly to move along the direction perpendicular to the moving direction of the filter plate to make one end of each of the connecting rollers close to the filter plate enter or move out of the corresponding hole.

6. The phosphate concentrate filter press apparatus of claim 5, wherein, The first driving assembly comprises a bottom rod, a rack, a plurality of mounting plates, a plurality of gears and a first telescopic driving piece, the bottom rod is horizontally slidably arranged on the machine frame along the moving direction of the filter plate and can move along the direction perpendicular to the moving direction of the filter plate, the rack is slidably arranged on the bottom rod, each of the mounting plates is fixed on the bottom rod along the length direction of the bottom rod, one end of each of the connecting rollers away from the filter plate is rotatably mounted on the corresponding mounting plate, each of the gears is fixedly sleeved on the corresponding connecting roller and is engaged with the rack, and the first telescopic driving piece is fixed on the bottom rod, the output end of the first telescopic driving piece is fixedly connected with the rack and is used for driving the rack to reciprocatingly move along the length direction of the bottom rod.

7. The phosphate concentrate filter press apparatus of claim 6, wherein, The second driving assembly comprises a second telescopic driving piece, the output end of the second telescopic driving piece is fixedly connected with the bottom rod and is used for driving the bottom rod to move along the direction perpendicular to the moving direction of the filter plate.

8. The phosphate concentrate filter press apparatus of claim 1, wherein, The knocking mechanism comprises a rotating shaft, a plurality of knocking pieces and a rotating driving piece, the rotating shaft is horizontally arranged along the moving direction of the filter plate, each of the knocking pieces corresponds to each of the filter plates which swing to the highest position, one end of the knocking piece is connected with the rotating shaft, the other end of the knocking piece is used for knocking the side wall of the filter plate, the rotating driving piece is fixedly connected with one end of the rotating shaft and is used for driving the rotating shaft to rotate.

9. The phosphate concentrate filter press apparatus of claim 8, wherein, The knocking piece comprises a fixed rod, a movable rod and a knocking ball, one end of the fixed rod is fixedly connected with the rotating shaft, one end of the movable rod is hingedly connected with the other end of the fixed rod, and the knocking ball is hingedly connected with the other end of the movable rod.

10. The phosphate concentrate filter press apparatus of claim 1, wherein, Two opposite side walls of the filter plate are provided with filter grooves, the filter plate is provided with a feeding hole which is in communication with the two filter grooves, the side wall of the filter plate is provided with two drainage holes which are in communication with the corresponding filter grooves, and each filter cloth is wrapped on the surface of the corresponding filter groove and avoids the feeding hole.

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