Ore pulp thickening system for laterite-nickel ore

Abstract

An ore pulp thickening system for laterite-nickel ore, the system comprising an extrusion-type thickening device (1), a speed measurement system (2), and a control system (3), wherein the extrusion-type thickening device (1) comprises an inner barrel (11), an outer barrel (12) and a thickening mechanism (13), the inner barrel (11) is vertically arranged inside the outer barrel (12), has an upper part connected to an ore pulp feeding pipe (111) and a lower part connected to an ore pulp discharging pipe (112), and is provided with a concentration sensor (114), and a filtering surface is formed on a surface thereof; the speed measurement system (2) comprises a first speed measurement device (21) and a second speed measurement device (22) which are respectively arranged on the ore pulp discharging pipe (112) and a water drainage pipe (113); and the control system (3) comprises a first controller (31) and a second controller (32), and the first controller (31) is electrically connected to the speed measurement system (2) and a feeding valve (116). The system enables efficient concentration of ore pulp so as to save on the area occupied by apparatuses and costs.

Description

A slurry thickening system for laterite nickel ore Technical Field

[0001] The present invention relates to the technical field of mineral processing, in particular to a slurry thickening system for laterite nickel ore. Background Art

[0002] In recent years, with the continued promotion and popularization of new energy electric vehicles and consumer electronics, global demand for lithium-ion secondary batteries has exploded. Nickel and nickel-based compounds, key materials in lithium-ion secondary batteries, are in high demand, leading to rising prices for nickel metal and nickel-based products. Globally, as environmental protection and renewable energy become increasingly popular, new energy electric vehicles and consumer electronics will become increasingly common. Until revolutionary new energy solutions emerge, lithium-ion secondary batteries will maintain a long-term monopoly. As nickel and nickel-based compounds, upstream of the supply chain, face a particularly severe supply shortage.

[0003] Nickel laterite ore, containing 65% to 70% of all land-based nickel reserves, is a crucial mineral for the smelting of nickel and nickel-based compounds. The precipitation of nickel and cobalt in laterite nickel ore smelting typically involves the following steps: grinding the ore to the desired particle size using a grinding unit to produce a slurry, which is then concentrated in a thickening unit.

[0004] At present, the production of laterite nickel ore mostly adopts a multi-stage thickening treatment system, or a method for improving the thickening and washing effect of high-clay uranium ore leaching pulp provided in publication number CN112095006A, which includes a countercurrent decantation system, which includes a plurality of thickeners connected in series, and uses the overflow of the first-stage thickener to adjust the feed slurry solid volume mass ratio to 6-10; the feed slurry is successively added with an amphoteric flocculant FZ3802 and a cationic flocculant CZ1690; the slurry fully mixed with the flocculant in step (2) is tangentially fed into the middle barrel of a certain stage thickener, and is countercurrently washed with the overflow of the next stage thickener; the overflow of the first-stage thickener is sent to an ion exchange process unit for adsorption recovery of uranium, and then the adsorption tail liquid is pumped to the final thickener as wash water; the underflow slurry is mixed with lime for neutralization and sent to the tailings dam for storage. Among them, multi-stage thickening and sedimentation are used to squeeze out the water in the slurry. This method requires the installation of multiple thickeners, and the thickening and sedimentation consumes a long time, and the floor space and equipment cost are large.

[0005] Summary of the Invention

[0006] The purpose of the present invention is to overcome the above technical deficiencies and propose a slurry thickening system for laterite nickel ore to solve the technical problems of low sedimentation efficiency, large floor space and equipment cost of the thickening system in the prior art.

[0007] In order to achieve the above technical objectives, the technical solution of the present invention provides a slurry thickening system for laterite nickel ore, including an extrusion thickening device, a speed measurement system and a control system.

[0008] The extrusion thickening device includes an inner cylinder, an outer cylinder, and a thickening mechanism. The inner cylinder is vertically arranged inside the outer cylinder, and its upper part is connected to the slurry feed pipe, the lower part is connected to the slurry discharge pipe, and is provided with a concentration sensor. The surface forms a filtering surface, so that an interlayer for filtering clear liquid is formed between the inner cylinder and the outer cylinder, and the interlayer is connected to the drain pipe. The slurry feed pipe is provided with a feed valve. The thickening mechanism includes a spiral extrusion member, and the driving end of the spiral extrusion member is spiral and provided with filter holes.

[0009] The velocity measuring system includes a first velocity measuring device and a second velocity measuring device respectively arranged in the slurry discharge pipe and the drainage pipe for measuring the flow velocity;

[0010] The control system includes a first controller and a second controller. The first controller is electrically connected to the speed measurement system and the feed valve to control the opening and closing of the feed valve by measuring the flow rate. The second controller is electrically connected to the concentration sensor and the spiral extruder to control the driving end of the spiral extruder to be in a first state of reciprocating swing when the slurry concentration does not reach a set value, and to be in a second state of spiraling downward for feeding when the slurry concentration reaches a set value.

[0011] In some embodiments, a discharge valve is provided on the slurry discharge pipe, and the second controller is also electrically connected to the discharge valve to control the opening and closing of the discharge valve; when the slurry concentration does not reach the set value, the discharge valve is in a closed state; when the slurry concentration reaches the set value, the discharge valve is in an open state.

[0012] In some embodiments, the outer surface of the inner cylinder is evenly provided with first filter holes, and a cone is formed below the inner cylinder, the cross-sectional area of ​​which decreases from top to bottom. The concentration sensor is provided at the smallest end of the inner cylinder and is connected to the slurry discharge pipe.

[0013] In some embodiments, the spiral extrusion member includes a main center rod, a conical center rod, a main spiral blade, a conical spiral blade, and a first driving member, wherein the main center rod is arranged at the upper portion of the inner cylinder and is rotatably connected to the inner cylinder; the conical center rod is arranged at the conical position of the lower portion of the inner cylinder and is coaxially connected to the main center rod; the main spiral blade is arranged on the outside of the main center rod and spirally extends along the length of the main center rod; the conical spiral blade is arranged on the outside of the conical center rod and connects with the main spiral blade and spirally extends along the length of the conical center rod; the first driving member is connected to the main center rod to drive the main spiral blade and the conical spiral blade to rotate through the main center rod and the conical center rod, and the first driving member is also electrically connected to the second controller. The outer edges of the main spiral blade and the conical spiral blade are both in contact with the inner wall of the inner cylinder, and the diameter of the main center rod is larger than the diameter of the conical center rod. The first driving member includes a first motor, two first pulleys and a first belt, wherein one of the first pulleys is connected to the main center rod through a coupling, and the other first pulley is connected to the driving shaft of the first motor; the first belt is arranged between the two first pulleys, and is used to transmit the driving force of the first motor through the first pulleys to drive the main center rod to rotate.

[0014] In some embodiments, the thickening mechanism further comprises a lifting and extruding member, the driving end of which is provided with filter holes for reciprocatingly lifting and extruding the slurry, and the driving ends of the lifting and extruding member and the spiral extrusion are both arranged inside the inner cylinder and located at the upper and lower parts bounded by the slurry discharge pipe. The movement range of the driving end of the lifting and extruding member is above the outlet of the slurry feed pipe; the lifting and extruding member comprises an extrusion plate and a second driving member, the extrusion plate being arranged horizontally inside the inner cylinder and being able to slide up and down along the inner wall of the inner cylinder, the extrusion plate being evenly provided with third filter holes; the second driving member is connected to the extrusion plate to drive the extrusion plate to move up and down. The second driving member includes two screws, two second pulleys, a second belt and a second motor. The two screws are vertically arranged inside the inner cylinder and are respectively threadedly connected to the two sides of the extrusion plate; the two second pulleys are respectively embedded in the two screws; the second belt is sleeved and connected to the two second pulleys; the second motor is connected to one of the screws to drive the two screws to rotate synchronously through the second pulley and the second belt.

[0015] In some embodiments, the first speed measuring device and the second speed measuring device both include a rotating shaft, a plurality of toggle plates and a speed sensor. The slurry discharge pipe and the drainage pipe are both provided with an expansion pipe, and the rotating shaft is rotatably arranged in the expansion pipe; a plurality of toggle plates are arranged in a circular array on one side of the rotating shaft with the central axis of the rotating shaft as the center of the circle, so as to drive the rotating shaft to rotate through the toggle plates under the drive of water flow; the speed sensor is provided on the rotating shaft, which is electrically connected to the first controller for monitoring the speed and sending signals to the first controller.

[0016] Compared with the prior art, the beneficial effects of the present invention include: by providing a double-layer cylinder structure, a thickening mechanism and a control system, the clear liquid is filtered and discharged through the inner cylinder, and the slurry is preliminarily filtered. The working state of the spiral extruder is controlled by the concentration value measured by the concentration sensor and fed back to the second controller. When the slurry concentration does not reach the set value, the spiral extruder is controlled to be in a first state of reciprocating swing, and the angle of its downward swing is greater than the angle of its upward swing, so that the slurry can be pushed downward and squeezed in sequence. When swinging upward, gaps are reserved at various locations in the slurry for water to flow out and be discharged through the interlayer and the drainage pipe, so that the slurry can be quickly thickened. The driving end of the spiral extruder is spirally distributed inside the inner cylinder, which can improve the uniformity of the slurry concentration at various locations inside the inner cylinder and reduce the uneven slurry concentration at various locations inside the device, thereby facilitating the improvement of the slurry concentration efficiency. Until the concentration sensor detects that the slurry concentration reaches the set value, the spiral extruder is controlled by the second controller to be in the second state of downward spiraling, at which time the spiral extruder is used to transport the slurry.

[0017] By setting a first speed measuring device and a second speed measuring device, the flow rates of the slurry and clear liquid discharged from the slurry discharge pipe and the drainage pipe are measured, and the opening or closing of the discharge valve is controlled by the first controller according to the discharge flow rate, so as to discharge a corresponding amount of slurry into the inner cylinder, thereby achieving timely replenishment of the slurry, facilitating the slurry thickening work, and improving the concentration efficiency.

[0018] By setting up an extrusion thickening device, a speed measurement system and a control system, it is possible to achieve high-efficiency concentration of the slurry, thereby saving equipment floor space and costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] FIG1 is a schematic diagram of the overall structure of an embodiment of a slurry thickening system for laterite nickel ore provided by the present invention;

[0020] FIG2 is a schematic diagram of the three-dimensional structure of a spiral extruder of the laterite nickel ore slurry thickening system in FIG1 ;

[0021] FIG3 is a schematic cross-sectional view of the lifting and extruding components of the laterite nickel ore slurry thickening system in FIG1 ;

[0022] FIG4 is a schematic diagram of the connection structure of the cone portion of the inner cylinder of the laterite nickel ore slurry thickening system in FIG1 ;

[0023] FIG5 is a schematic structural diagram of a velocity measurement system of the slurry thickening system for laterite nickel ore in FIG1 ;

[0024] FIG6 is a circuit connection diagram of a first controller of the slurry thickening system for laterite nickel ore in FIG1 ;

[0025] FIG. 7 is a circuit connection diagram of a first controller of the slurry thickening system for laterite nickel ore in FIG. 1 .

[0026] In the picture:

[0027] 1. Extrusion thickening device; 11. Inner cylinder; 111. Slurry feed pipe; 112. Slurry discharge pipe; 113. Drain pipe; 114. Concentration sensor; 115. Discharge valve; 116. Feed valve; 117. First filter hole; 12. Outer cylinder; 13. Thickening mechanism; 14. Screw extrusion element; 141. Main center rod; 142. Cone center rod; 143. Main spiral blade; 144. Cone spiral blade; 1441. Second filter hole; 145. First drive element; 1451. First motor; 1452. First pulley; 1453. Coupling; 1454. First belt; 15. Lifting extrusion element; 151. Extrusion plate; 152. Third filter hole; 153. Second drive element; 1531. Screw; 1532. Second pulley; 1533. Second belt;

[0028] 2. Speed ​​measuring system; 21. First speed measuring device; 211. Rotating shaft; 212. Toggle plate; 213. Speed ​​sensor; 214. Expansion pipe; 22. Second speed measuring device;

[0029] 3. Control system; 31. First controller; 32. Second controller;

[0030] 4. Sedimentation thickening device. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention 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 invention and are not intended to limit the present invention.

[0032] As shown in FIG. 1 to FIG. 7 , the present invention provides a slurry thickening system for laterite nickel ore, comprising an extrusion thickening device 1 , a speed measuring system 2 and a control system 3 .

[0033] The extrusion thickening device 1 includes an inner cylinder 11, an outer cylinder 12 and a thickening mechanism 13. The inner cylinder 11 is vertically arranged inside the outer cylinder 12. The upper part of the inner cylinder 11 is connected to the slurry feed pipe 111, the lower part is connected to the slurry discharge pipe 112 and is provided with a concentration sensor 114. A filtering surface is formed on the surface so that an interlayer for filtering the clear liquid is formed between the inner cylinder 11 and the outer cylinder 12. The interlayer is connected to the drain pipe 113. A feed valve 116 is provided on the slurry feed pipe 111. The thickening mechanism 13 includes a spiral extrusion member 14. The driving end of the spiral extrusion member 14 is spiral and provided with filter holes.

[0034] The velocity measuring system 2 includes a first velocity measuring device 21 and a second velocity measuring device 22 respectively provided at the slurry discharge pipe 112 and the drainage pipe 113 for measuring flow velocity.

[0035] The control system 3 includes a first controller 31 and a second controller 32. The first controller 31 is electrically connected to the speed measurement system 2 and the feed valve 116 to control the opening and closing of the feed valve 116 by measuring the flow rate. The second controller 32 is electrically connected to the concentration sensor 114 and the spiral extruder 14 to control the driving end of the spiral extruder 14 to be in a first state of reciprocating swing when the slurry concentration has not reached the set value, and to be in a second state of spiraling downward for feeding when the slurry concentration reaches the set value.

[0036] Wherein, when the spiral extrusion member 14 is in the first state, the angle of its downward swing is greater than the angle of its upward swing.

[0037] In this device, a double-layer cylinder structure is provided, and the slurry is discharged into the interior of the inner cylinder 11 through the slurry feed pipe 111, and the clear liquid is filtered out through the inner cylinder 11, and the filtered clear liquid flows to the interlayer and is discharged through the drain pipe 113, while the slurry is retained in the interior of the inner cylinder 11. After preliminary filtration, it can also be squeezed and dehydrated through the spiral extrusion member 14 in the inner cylinder 11; wherein, the working state of the spiral extrusion member 14 is fed back to the second controller 32 through the concentration value measured by the concentration sensor 114 for control. When the slurry concentration does not reach the set value, the spiral extrusion member 14 is required to squeeze out the water in the slurry. At this time, the spiral extrusion member 14 is in a first state of reciprocating swing, and its downward swing angle is greater than the upward swing angle. The spiral extrusion member 14 is spiral and is provided with The reciprocating swing of the driving end of the filter hole can push and squeeze the slurry downward in turn. When swinging upward, gaps are reserved in various places in the slurry, and water flows out and is discharged through the interlayer and the drainage pipe 113, which can achieve rapid concentration of the slurry. The driving end of the spiral extruder 14 is spirally distributed inside the inner cylinder 11, which can improve the uniformity of the concentration of the slurry at various places inside the inner cylinder 11 and reduce the uneven concentration of the slurry at various places inside the device, thereby helping to improve the concentration efficiency of the slurry. Until the concentration sensor 114 detects that the slurry concentration reaches the set value, the second controller 32 controls the spiral extruder 14 to be in the second state of the downward spiral. At this time, the spiral extruder 14 is used to transport the slurry and transport the slurry to the slurry discharge pipe 112 to discharge the material that meets the concentration requirements.

[0038] A first speed measuring device 21 and a second speed measuring device 22 are respectively provided on the slurry discharge pipe 112 and the drainage pipe 113 to measure the flow rate of the discharged slurry and clear liquid, and the discharge valve 115 is opened or closed by the first controller 31 according to the discharge flow rate, so as to discharge a corresponding amount of slurry into the inner cylinder 11, thereby achieving timely replenishment of the slurry, facilitating continuous slurry thickening work, and improving the concentration efficiency.

[0039] It should be noted that, in some embodiments, the first controller 31 and the second controller 32 may be two CPU controllers, or two control parts in one CPU controller, which is not limited here.

[0040] The device utilizes the inner cylinder 11 and the spiral extruder 14 to filter and discharge the slurry. Some usable slurry may exist in the clear liquid discharged through the drain pipe 113. To avoid wasting the slurry, as shown in FIG1 , in some embodiments, a sedimentation thickening device 4 is provided, which is connected to the drain pipe 113, can receive the discharged clear liquid, and precipitate the slurry in the clear liquid by sedimentation. The bottom outlet thereof is connected to the slurry feed pipe 111, and the precipitated slurry can be returned to the extrusion thickening device 1 for thickening treatment.

[0041] The inner cylinder 11 is arranged inside the outer cylinder 12 and is used to filter the moisture contained in the slurry. As shown in Figure 1, in some embodiments, the inner cylinder 11 and the outer cylinder 12 are both vertical and concentrically arranged. The outer surface of the inner cylinder 11 is evenly provided with first filter holes 117, and a cone is formed below it. The cross-sectional area of ​​the cone decreases from top to bottom. A concentration sensor 114 is set at the smallest end of the inner cylinder 11 and is connected to the slurry discharge pipe 112. By setting the cone, the bottom of the inner cylinder 11 is gradually narrowed, which is conducive to accurate detection by the concentration sensor 114.

[0042] The driving end of the spiral extrusion member 14 is spiral and provided with filter holes, as shown in Figures 1 and 2. In some embodiments, the spiral extrusion member 14 includes a main center rod 141, a conical center rod 142, a main spiral blade 143, a conical spiral blade 144 and a first driving member 145. Specifically, the main center rod 141 is arranged at the upper part of the inner cylinder 11 and is rotatably connected to the inner cylinder 11. Its upper and lower ends are fixed to the inner cylinder 11 through brackets and can rotate on the brackets; the conical center rod 142 is arranged at the conical position of the lower part of the inner cylinder 11, and is coaxially docked with the main center rod 141 and fixedly connected; the main spiral blade 143 is fixedly arranged on the outside of the main center rod 141 and spirally extends along the length direction of the main center rod 141; the conical spiral blade 144 is fixedly arranged On the outside of the conical center rod 142, it is connected to the main spiral blade 143, and its top end is fixedly connected to the bottom end of the main spiral blade 143, and spirally extends along the length direction of the conical center rod 142 until it extends to the slurry discharge pipe 112. Second filter holes 1441 are provided on the main spiral blade 143 and the conical spiral blade 144; the first driving member 145 is connected to the main center rod 141, and is used to drive the main spiral blade 143 and the conical spiral blade 144 to rotate through the main center rod 141 and the conical center rod 142. The first driving member 145 is also electrically connected to the second controller 32, and the second controller 32 can control the driving mode of the first driving member 145 to control the main spiral blade 143 and the conical spiral blade 144 to perform reciprocating swinging or downward spiral rotation.

[0043] Furthermore, in order to prevent the first filter hole 117 on the inner cylinder 11 from being clogged, in some embodiments, the outer edges of the main spiral blade 143 and the cone spiral blade 144 are in contact with the inner wall of the inner cylinder 11, and the main spiral blade 143 and the cone spiral blade 144 can be rotated to make them contact with the inner wall of the inner cylinder 11 and scrape back and forth, thereby preventing the first filter hole 117 on the inner cylinder 11 from being clogged. At the same time, the main spiral blade 143 and the cone spiral blade 144 are in contact with the inner wall of the inner cylinder 11. No gap is left between the inner walls of the inner cylinder 11 to enhance the water squeezing effect when the main spiral blades 143 and the conical spiral blades 144 are pressed down. In order to adapt to the conical position and other positions with larger diameters of the inner cylinder 11, the diameter of the main center rod 141 is set to be larger than the diameter of the conical center rod 142. The main center rod 141 can be adapted to be installed in a position above the conical part, and a gap is reserved for installing the main spiral blades 143. The diameter of the conical center rod 142 decreases downward to adapt to the small-diameter conical position.

[0044] Specifically, in order to drive the main spiral blade 143 and the cone spiral blade 144 to swing back and forth or rotate downward in a spiral, as shown in FIG1 , in some embodiments, the first driving member 145 includes a first motor 1451, two first pulleys 1452 and a first belt 1454, wherein one of the first pulleys 1452 is fixedly connected to the main center rod 141 through a coupling 1453, and the other first pulley 1452 is sleeved on the driving shaft of the first motor 1451 and fixedly connected to the driving shaft; the first belt 1454 is sleeved and connected to the two first pulleys 1452. 52, during implementation, the first motor 1451 drives the first pulley 1452 connected thereto to rotate, and the driving force of the first motor 1451 is transmitted through the first pulley 1452 to drive the other first pulley 1452 and the main center rod 141 connected thereto to rotate. It should be noted that the first motor 1451 is a forward and reverse motor, which is mainly controlled by a controller and a sensor. In other embodiments, the first pulley 1452 and the first belt 1454 can also be replaced by other connecting parts for transmitting power, such as a gear set.

[0045] To further improve the compacting efficiency, as shown in Figures 1 and 3, in some embodiments, the thickening mechanism 13 also includes a lifting and extruding member 15. The driving end of the lifting and extruding member 15 is provided with a filter hole for reciprocating lifting and extruding the slurry. The driving ends of the lifting and extruding member 15 and the spiral extruder are both arranged inside the inner cylinder 11 and are respectively located at the upper and lower parts of the slurry discharge pipe 112. After the lifting and extruding member 15 pushes the slurry downward and squeezes it, the slurry is then spirally squeezed to increase the concentration of the slurry. Furthermore, the slurry level in the extrusion thickening device 1 is maintained within the movement range of the driving end of the lifting and extruding member 15, and the first and second speed measuring devices 21 and 22 are used to measure the discharge volume of the slurry discharge pipe 112 and the drainage pipe 113 respectively. The valve is opened based on the measured discharge volume to deliver a corresponding amount of slurry, so that the slurry level can be maintained at an appropriate position to cooperate with the lifting and extrusion. Specifically, the movement stroke of the driving end of the lifting extrusion member 15 is above the outlet of the slurry feed pipe 111; the lifting extrusion member 15 includes an extrusion plate 151 and a second driving member 153. The extrusion plate 151 is horizontally arranged inside the inner cylinder 11, and its outer peripheral surface is in contact with the inner wall of the inner cylinder 11, and can slide up and down along the inner wall of the inner cylinder 11. Third filter holes 152 are evenly opened on the extrusion plate 151; the second driving member 153 is connected to the extrusion plate 151 to drive the extrusion plate 151 to move up and down, which can squeeze the slurry on the upper part of the inner cylinder 11 and push the slurry downward, so as to better filter the moisture in the slurry and ensure the fluidity of the slurry.

[0046] Specifically, in order to drive the extrusion plate 151 to move up and down, in some embodiments, the second driving member 153 includes two screws 1531, two second pulleys 1532, a second belt 1533 and a second motor. The two screws 1531 are vertically arranged inside the inner cylinder 11 and are rotatably connected to the inner cylinder 11, and are also threadedly connected to the two sides of the extrusion plate 151; the two second pulleys 1532 are respectively embedded and fixed on the two screws 1531; the second belt 1533 is sleeved and connected to the two second pulleys 1532; the second motor is connected to one of the screws 1531. During implementation, the second motor can rotate forward and reverse to drive the two screws 1531 to rotate synchronously through the second pulley 1532 and the second belt 1533. The two screws 1531 have the same rotation direction. When rotating forward or reverse synchronously, the extrusion plate 151 can be driven to rise and fall. It should be noted that the second motor is a forward and reverse motor. In other embodiments, the second driving member 153 can also be a hydraulic cylinder or a pneumatic cylinder, which is directly connected to the extrusion plate 151 and can drive the extrusion plate 151 to move up and down through expansion and contraction.

[0047] When the slurry concentration does not reach the set value, in order to avoid the slurry from being automatically discharged through the slurry discharge pipe 112 at the bottom, as shown in Figure 4, in some embodiments, a discharge valve 115 is provided on the slurry discharge pipe 112, and the second controller 32 is also electrically connected to the discharge valve 115. The second controller 32 can control the opening and closing of the discharge valve 115; when the slurry concentration does not reach the set value, the discharge valve 115 is in a closed state. At this time, under the spiral extrusion of the spiral extruder 14, the slurry will not be discharged through the slurry discharge pipe 112, which facilitates the downward pressure generated by the spiral extruder 14 to squeeze out the internal moisture of the slurry; when the slurry concentration reaches the set value, the discharge valve 115 is in an open state. Correspondingly, the spiral extruder 14 is in the second state of spiraling downward, and can discharge the slurry to the next equipment through the slurry discharge pipe 112, which not only facilitates the filtration of water, but also facilitates the transportation of slurry.

[0048] As shown in Figure 5, in some embodiments, the first speed measuring device 21 and the second speed measuring device 22 both include a rotating shaft 211, a plurality of toggle plates 212 and a speed sensor 213. An expansion pipe 214 is provided on the slurry discharge pipe and the drain pipe 113, and the rotating shaft 211 is rotatably arranged in the expansion pipe 214; a plurality of toggle plates 212 are arranged in a circular array on one side of the rotating shaft 211 with the central axis of the rotating shaft 211 as the center of the circle, so as to drive the rotating shaft 211 to rotate through the toggle plates 212 under the drive of water flow; the speed sensor 213 is provided on the rotating shaft 211, and the speed is measured by it, wherein the speed sensors 213 are respectively a first speed sensor and a second speed sensor, the first speed sensor is used to detect the discharge volume of the slurry discharge pipe, and the second speed sensor is used to detect the clear water discharge volume of the drain pipe, and the speed sensor 213 is electrically connected to the first controller 31, and after monitoring the speed, it sends a signal to the first controller 31 to trigger a corresponding instruction.

[0049] The present invention provides a double-layer cylinder structure, a thickening mechanism 13 and a control system 3, and filters and discharges the clear liquid through the inner cylinder 11 to perform preliminary filtration of the slurry. The working state of the spiral extruder 14 is fed back to the second controller 32 through the concentration value measured by the concentration sensor 114 for control. When the slurry concentration does not reach the set value, the spiral extruder 14 is controlled to be in the first state of reciprocating swing. The angle of the spiral extruder 14 when it swings downward is greater than the angle when it swings upward, so that the slurry can be pushed downward and squeezed in turn. When it swings upward, gaps are reserved at various places in the slurry to allow water to flow out and The slurry is discharged through the interlayer and the drainage pipe 113, which can achieve rapid concentration of the slurry, and the driving end of the spiral extruder 14 is spirally distributed inside the inner cylinder 11, which can improve the uniformity of the slurry concentration at various locations inside the inner cylinder 11 and reduce the uneven slurry concentration at various locations inside the device, thereby helping to improve the concentration efficiency of the slurry. Until the concentration sensor 114 detects that the slurry concentration reaches the set value, the second controller 32 controls the spiral extruder 14 to be in the second state of the downward spiral, and at this time the spiral extruder 14 is used to transport the slurry.

[0050] The present invention provides a first speed measuring device 21 and a second speed measuring device 22 for measuring the flow rate of the slurry and clear liquid discharged from the slurry discharge pipe 112 and the drain pipe 113, and controls the opening or closing of the discharge valve 115 through the first controller 31 according to the discharge flow rate, so as to discharge a corresponding amount of slurry into the inner cylinder 11, thereby achieving timely replenishment of the slurry, facilitating the slurry thickening work, and improving the concentration efficiency.

[0051] The present invention can achieve high-efficiency concentration of slurry by providing an extrusion thickener 1, a speed measuring system 2, and a control system 3, thereby saving equipment floor space and cost.

[0052] In the description of this application, it should be noted that the terms "upper" and "lower" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application. Unless otherwise expressly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be internal communication between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0053] It should be noted that, in this application, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element.

[0054] The specific embodiments of the present invention described above do not limit the scope of protection of the present invention. Any other corresponding changes and modifications made based on the technical concept of the present invention should be included in the scope of protection of the claims of the present invention.

Claims

1. A slurry thickening system for laterite nickel ore, It is characterized in that include: An extrusion thickening device, comprising an inner cylinder, an outer cylinder and a thickening mechanism, wherein the inner cylinder is vertically arranged inside the outer cylinder, the upper part of which is connected to a slurry feed pipe, the lower part of which is connected to a slurry discharge pipe and is provided with a concentration sensor, and a filtering surface is formed on the surface, so that an interlayer for filtering clear liquid is formed between the inner cylinder and the outer cylinder, the interlayer is connected to a drain pipe, a feed valve is provided on the slurry feed pipe, and the thickening mechanism comprises a spiral extrusion piece, the driving end of which is spiral and provided with filter holes; A velocity measuring system, the velocity measuring system comprising a first velocity measuring device and a second velocity measuring device respectively arranged in a slurry discharge pipe and a drainage pipe, for measuring flow velocity; and A control system, the control system comprising a first controller and a second controller, the first controller being electrically connected to the speed measurement system and the feed valve to control the opening and closing of the feed valve by measuring the flow rate, the second controller being electrically connected to the concentration sensor and the spiral extruder to control the driving end of the spiral extruder to be in a first state of reciprocating swing when the slurry concentration does not reach a set value, and to control the driving end of the spiral extruder to be in a second state of spiraling downward for feeding when the slurry concentration reaches a set value.

2. The slurry thickening system for laterite nickel ore according to claim 1, It is characterized in that The slurry discharge pipe is provided with a discharge valve, and the second controller is also electrically connected to the discharge valve and can control the opening and closing of the discharge valve; When the slurry concentration does not reach the set value, the discharge valve is closed; When the slurry concentration reaches the set value, the discharge valve is in the open state.

3. The slurry thickening system for laterite nickel ore according to claim 1, It is characterized in that The outer surface of the inner cylinder is evenly provided with first filter holes, and a cone is formed below the inner cylinder, the cross-sectional area of ​​which decreases from top to bottom. The smallest end of the inner cylinder is provided with the concentration sensor and connected to the slurry discharge pipe.

4. The slurry thickening system for laterite nickel ore according to claim 3, It is characterized in that The spiral extrusion comprises: A main center rod, which is disposed on the upper portion of the inner cylinder and is rotatably connected to the inner cylinder; A cone center rod, which is arranged at the cone position at the lower part of the inner cylinder and is coaxially connected with the main center rod; A main spiral blade, which is arranged on the outside of the main central rod and spirally extends along the length direction of the main central rod; A conical spiral blade, wherein the conical spiral blade is disposed outside the conical center rod, connected to the main spiral blade and spirally extends along the length direction of the conical center rod; and A first driving member is connected to the main center rod, and is used to drive the main spiral blade and the cone spiral blade to rotate through the main center rod and the cone center rod. The first driving member is also electrically connected to the second controller.

5. The slurry thickening system for laterite nickel ore according to claim 4, It is characterized in that The outer edges of the main spiral blades and the cone spiral blades are both in contact with the inner wall of the inner cylinder, and the diameter of the main center rod is greater than the diameter of the cone center rod.

6. The slurry thickening system for laterite nickel ore according to claim 4, It is characterized in that The first driving member comprises: First motor; two first pulleys, one of which is connected to the main center rod via a coupling, and the other of which is connected to the driving shaft of the first motor; and A first belt is sleeved between the two first pulleys and is used for transmitting the driving force of the first motor through the first pulleys to drive the main center rod to rotate.

7. The slurry thickening system for laterite nickel ore according to claim 1, It is characterized in that The thickening mechanism also includes a lifting extrusion member, the driving end of which is provided with a filter hole for reciprocating lifting and squeezing the slurry, and the lifting extrusion member and the driving end of the spiral extrusion are both arranged inside the inner cylinder and located at the upper and lower parts bounded by the slurry discharge pipe.

8. The slurry thickening system for laterite nickel ore according to claim 7, It is characterized in that The movement stroke of the driving end of the lifting extrusion member is above the outlet of the slurry feeding pipe; the lifting extrusion member comprises: An extrusion plate, which is horizontally arranged inside the inner cylinder and can slide up and down along the inner wall of the inner cylinder, and the extrusion plate is evenly provided with third filter holes; and A second driving member is connected to the extrusion plate and is used to drive the extrusion plate to move up and down.

9. The slurry thickening system for laterite nickel ore according to claim 8, It is characterized in that The second driving member comprises: Two screw rods, both of which are vertically arranged inside the inner cylinder and are respectively threadedly connected to two sides of the extrusion plate; Two second pulleys, wherein the two second pulleys are respectively embedded on the two screw rods; A second belt, wherein the second belt is sleeved to connect the two second pulleys; and A second motor is connected to one of the screw rods to drive the two screw rods to rotate synchronously through a second pulley and a second belt.

10. The slurry thickening system for laterite nickel ore according to claim 1, It is characterized in that The first speed measuring device and the second speed measuring device both include: A rotating shaft, the slurry discharge pipe and the drainage pipe are both provided with expansion pipes, and the rotating shaft is rotatably arranged in the expansion pipes; A plurality of paddle plates, which are arranged in a circular array on one side of the rotating shaft with the central axis of the rotating shaft as the center of the circle, so as to drive the rotating shaft to rotate through the paddle plates under the drive of water flow; and A rotation speed sensor is arranged on the rotating shaft and is electrically connected to the first controller for monitoring the rotation speed and sending a signal to the first controller.

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