Self-grading fluidized bed stirring and grinding device and method

Abstract

The invention relates to a self-grading fluidized bed stirring and grinding device and method, belongs to the technical field of ore grinding, and solves the problems of low ore grinding efficiency and serious excessive grinding in the prior art. The device comprises a water supply regulation and control unit, a slurry regulation and control unit and a grinding self-grading unit, the grinding self-grading unit comprises a grinding column body, an inner cavity of the grinding column body is divided into a settling chamber, a grinding chamber and a buffer chamber from top to bottom, the water supply regulation and control unit is communicated with the buffer chamber, and the slurry regulation and control unit is communicated with the grinding chamber. Fine minerals meeting the particle size requirement in the to-be-ground materials directly enter the upper settling chamber without being ground under the action of rising water flow drag force and the inclined plate and are discharged as qualified products, the treatment capacity of a grinding machine can be effectively reduced through pre-classification, selective ore grinding is achieved, the ore grinding energy consumption is reduced, and the ore grinding efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of ore grinding, and in particular to a self-grading fluidized bed stirring grinding device and method. Background Art

[0002] As the preliminary preparation link of mineral separation, grinding operation plays a vital role in the mineral processing industry. The quality of the grinding product directly affects the separation efficiency of the mineral processing plant. At the same time, the power and metal consumption required in the grinding process account for a significant proportion of the operating costs of the mineral processing plant.

[0003] Stirred mills have been widely used in the field of fine grinding and regrinding in recent years due to their high energy density, low energy consumption for fine grinding, simple process, and uniform product particle size distribution. Stirred mills can be divided into dry and wet processes according to the grinding environment. At present, wet stirred mills have been large-scaled and widely used in the mineral processing industry. The material moves in the grinding cylinder in the form of slurry, has good fluidity, can more easily separate the product and the grinding medium, and have stable continuous operation and a relatively mature process.

[0004] However, in actual applications, there is a phenomenon of over-grinding, which leads to excessive fineness of product particles, which has a negative impact on product quality and subsequent processing technology. In addition, when using a top-in and bottom-out stirred mill for material grinding, large particles sink quickly under the action of gravity and are discharged, which causes them to stay in the grinding cylinder for a short time, the grinding effect is not sufficient, and thus reduces the grinding efficiency. Summary of the invention

[0005] In view of the above analysis, the embodiment of the present invention aims to provide a self-grading fluidized bed stirring grinding device and method to solve the problems of low grinding efficiency and serious over-grinding in the existing grinding process. The purpose is to improve the grinding efficiency of the stirring mill, ensure that the material and the grinding medium can be separated quickly and effectively, and at the same time improve the reliability and stability of the equipment.

[0006] On the one hand, the present invention provides a self-grading fluidized bed stirring and grinding device, including a water supply control unit, a slurry control unit and a grinding self-grading unit, the grinding self-grading unit includes a grinding column, the inner cavity of the grinding column is divided into a sedimentation chamber, a grinding chamber and a buffer chamber from top to bottom, the water supply control unit is connected to the buffer chamber, and the slurry control unit is connected to the grinding chamber.

[0007] Furthermore, the water supply regulation unit includes a water storage tank and an ascending water flow delivery pipe. A water inlet is provided at the bottom of the grinding column, and the water inlet is connected to the grinding chamber. One end of the ascending water flow delivery pipe is connected to the water storage tank, and the other end is connected to the water inlet.

[0008] Furthermore, the slurry regulating unit includes a slurry configuration machine and a slurry conveying pipe, a feed port is provided in the middle of the grinding column, the feed port is communicated with the buffer chamber, and the slurry configuration machine is connected to the feed port through the slurry conveying pipe.

[0009] Furthermore, the feed inlet and the water inlet are both provided in plurality, the plurality of feed inlets are evenly distributed along the outer circumference of the grinding chamber, and the plurality of water inlets are evenly distributed along the bottom circumference of the grinding cylinder.

[0010] Furthermore, the water supply control unit also includes a first solenoid valve and a first high-pressure plunger pump, and the first solenoid valve and the first high-pressure plunger pump are both arranged on the rising water flow conveying pipe.

[0011] Furthermore, the slurry regulating unit further comprises a second solenoid valve and a slurry pump, wherein the second solenoid valve and the slurry pump are both arranged on the slurry conveying pipe, and the slurry pump is located downstream of the second solenoid valve.

[0012] Furthermore, it also includes a water delivery pipeline, which is connected to the water storage tank and the slurry preparation machine.

[0013] Furthermore, the water delivery pipeline includes a water delivery pipe, a third solenoid valve and a second high-pressure plunger pump.

[0014] Furthermore, the grinding self-grading unit also includes a support frame for supporting the grinding cylinder.

[0015] On the other hand, the present invention provides a self-grading fluidized bed stirring and grinding method, which uses the above-mentioned self-grading fluidized bed stirring and grinding device to perform fluidized bed stirring and grinding operations.

[0016] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0017] (1) The inner cavity of the grinding column of the present invention is divided into a sedimentation chamber, a grinding chamber and a buffer chamber from top to bottom. The sedimentation chamber is provided with multiple layers of inclined plates, the grinding chamber is provided with a stirring device, and a blocking plate is provided between the sedimentation chamber and the grinding chamber to convert the spiral upward flow in the grinding chamber into an upward flow, thereby reducing the interference of the grinding area on the sedimentation area, ensuring that the flow between the inclined plates is laminar, and thus ensuring the accuracy of classification. The material to be ground is passed into the grinding chamber, and water is transported to the buffer chamber. The grinding process is carried out in the rising water flow, which can increase the fluidity of the ground material and the grinding medium in the lower stirring and grinding area, reduce the torque acting on the stirring shaft, reduce the wear rate, and extend the service life.

[0018] (2) The feed inlet of the present invention is arranged between the sedimentation zone and the grinding zone. The fine minerals that meet the particle size requirements in the material to be ground move upward under the action of the drag force of the rising water flow, and directly enter the upper sedimentation chamber without being ground, and are discharged as qualified products. Pre-classification can effectively reduce the processing capacity of the mill, realize selective grinding, reduce grinding energy consumption, and improve grinding efficiency.

[0019] (3) The coarse / fine minerals after grinding of the present invention are classified once in the grinding area, and the fine particles are forced to be transported into the sedimentation chamber to avoid over-grinding; the secondary classification is carried out in the sedimentation chamber by the combined effect of the rising water flow and the inclined plate to prevent the coarse particles from floating up and accurately control the grinding particle size. The multi-layer inclined plates in the sedimentation chamber increase the sedimentation area, which can accelerate the sedimentation of particles and improve the classification efficiency and accuracy.

[0020] (4) The present invention provides a buffer chamber at the bottom of the grinding column, and a water distribution plate is provided at the top of the buffer chamber. The water in the buffer chamber is evenly distributed through the water distribution plate and enters the grinding chamber at a lower Re number, forming a stable ascending water flow field, thereby improving the quality of grinding. At the same time, after the grinding column is filled with water, the material to be ground is introduced, thereby avoiding the impact of the mineral to be ground and the ascending water flow, which is conducive to forming a stable grinding environment.

[0021] (5) The present invention adjusts the inclination angle and the distance between the inclined plates according to the characteristics of the material to be ground and the product requirements, and controls the grinding time and grinding fineness of the mineral by changing the water speed, so as to obtain better grinding quality.

[0022] In the present invention, the above-mentioned technical solutions can also be combined with each other to achieve more preferred combination solutions. Other features and advantages of the present invention will be described in the subsequent description, and some advantages can become obvious from the description, or can be understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained through the contents particularly pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings are only for the purpose of illustrating particular embodiments and are not to be considered limiting of the present invention. Like reference symbols denote like components throughout the drawings.

[0024] Figure 1 It is a structural schematic diagram of a self-grading fluidized bed stirring and grinding device of a specific embodiment;

[0025] Figure 2 It is a schematic structural diagram of a grinding self-grading unit according to a specific embodiment.

[0026] Reference numerals:

[0027] 100-water supply control unit; 101-water storage tank; 102-rising water flow delivery pipe; 103-first solenoid valve; 104-first high-pressure plunger pump; 105-first flow meter; 106-first flow regulating valve;

[0028] 200-slurry control unit; 201-slurry configuration machine; 202-slurry delivery pipe; 203-second solenoid valve; 204-second flow meter; 205-second flow control valve; 206-slurry pump;

[0029] 300-grinding self-grading unit; 301-grinding column; 3011-feeding port; 3012-water inlet; 3013-buffer chamber; 3014-grinding chamber; 3015-sedimentation chamber; 302-support frame; 3021-support column; 3022-first annular disk; 3023-second annular disk; 3024-support disk; 303-stirring mechanism; 3031-motor; 3032-stirring shaft; 3033-stirring rod; 304-water distribution plate; 305-blocking orifice plate; 306-inclined plate; 307-overflow trough;

[0030] 400 - water delivery pipeline; 401 - water delivery pipe; 402 - third solenoid valve; 403 - third flow meter; 404 - third flow regulating valve; 405 - second high-pressure plunger pump. DETAILED DESCRIPTION

[0031] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of the present invention and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not used to limit the scope of the present invention.

[0032] Example 1

[0033] A specific embodiment of the present invention, as Figure 1 As shown, a self-grading fluidized bed stirring and grinding device is disclosed, including a water supply control unit 100, a slurry control unit 200 and a grinding self-grading unit 300, the water supply control unit 100 provides clean water to the grinding self-grading unit 300, the slurry control unit 200 provides slurry to the grinding self-grading unit 300, and the slurry is ground and graded in the grinding self-grading unit 300.

[0034] Specifically, Figure 1 As shown, the water supply control unit 100 includes a water storage tank 101 and an ascending water flow delivery pipe 102, one end of the ascending water flow delivery pipe 102 is connected to the water storage tank 101, and the other end is connected to the grinding self-grading unit 300, and the water in the water storage tank 101 is transported to the grinding self-grading unit 300 through the ascending water flow delivery pipe 102.

[0035] Considering that the grinding self-classifying unit 300 has a certain demand for water, when the water supplied to the grinding self-classifying unit 300 reaches the demand or other situations requiring the water supply to be stopped occur, the water supply needs to be interrupted. Figure 1 As shown, the water supply control unit 100 further includes a first solenoid valve 103 , which is disposed on the rising water flow conveying pipe 102 and is used to control the on-off of the rising water flow conveying pipe 102 .

[0036] In this embodiment, an ascending water flow delivery pipe 102 is provided between the water storage tank 101 and the grinding self-grading unit 300, and a first solenoid valve 103 is provided on the ascending water flow delivery pipe 102. The first solenoid valve 103 controls the on-off of the ascending water flow delivery pipe 102, thereby being able to control the amount of water entering the grinding self-grading unit 300, and in special circumstances, for example, when the grinding self-grading unit 300 fails, the on-off of the water supply.

[0037] Since the water in the water storage tank 101 needs power to be transported to the grinding self-classifying unit 300, as Figure 1 As shown, the water supply regulation unit 100 also includes a first high-pressure plunger pump 104, which is arranged in the rising water flow conveying pipe 102. Preferably, the first high-pressure plunger pump 104 is arranged downstream of the first solenoid valve 103, and the water in the water storage tank 101 is conveyed to the grinding self-grading unit 300 by means of the periodic change of volume in the working chamber of the first high-pressure plunger pump 104.

[0038] In order to facilitate observation of the amount of clean water supplied from the water storage tank 101 to the grinding and self-classifying unit 300, Figure 1 As shown, the water supply control unit 100 further includes a first flow meter 105 , which is disposed in the rising water flow conveying pipe 102 . Preferably, the first flow meter 105 is disposed downstream of the first high-pressure plunger pump 104 .

[0039] Considering the regulation of the water flow in the rising water flow conveying pipe 102, as Figure 1 As shown, the water supply control unit 100 further includes a first flow regulating valve 106, which is disposed in the rising water flow conveying pipe 102, preferably, the first flow regulating valve 106 is disposed downstream of the first flow meter 105. The first flow regulating valve 106 is used to adjust the flow of the fluid.

[0040] In this embodiment, an ascending water flow delivery pipe 102 is provided in the water storage tank 101 and the grinding self-grading unit 300, and a first electromagnetic valve 103, a first high-pressure plunger pump 104, a first flow meter 105 and a first flow regulating valve 106 are provided on the ascending water flow delivery pipe 102 to realize the on-off and flow monitoring of the clean water flowing through the ascending water flow delivery pipe 102. The first electromagnetic valve 103, the first high-pressure plunger pump 104, the first flow meter 105 and the first flow regulating valve 106 sequentially provided on the ascending water flow delivery pipe 102 together with the ascending water flow delivery pipe 102 form an ascending water flow delivery pipeline.

[0041] like Figure 1 As shown, the slurry control unit 200 includes a slurry preparation machine 201 and a slurry conveying pipe 202. The slurry preparation machine 201 is connected to the grinding self-classifying unit 300 through the slurry conveying pipe 202. The mineral to be ground and water are added to the slurry preparation machine 201 and mixed evenly to form a slurry with a certain mass fraction.

[0042] In order to control the on and off of slurry transportation, Figure 1 As shown, the slurry regulating unit 200 further includes a second solenoid valve 203 , which is disposed on the slurry conveying pipe 202 , and is used to control the on-off of the slurry conveying pipe 202 .

[0043] Considering the monitoring and adjustment of slurry flow, such as Figure 1 As shown, the slurry control unit 200 includes a second flow meter 204 and a second flow regulating valve 205. The second flow meter 204 and the second flow regulating valve 205 are both arranged on the slurry conveying pipe 202. Preferably, the second flow meter 204 is arranged downstream of the second solenoid valve 203, and the second flow regulating valve 205 is arranged downstream of the second flow meter 204.

[0044] In this embodiment, a second flow meter 204 and a second flow regulating valve 205 are provided on the slurry conveying pipe 202 . The second flow regulating valve 205 is adjusted by observing the reading of the second flow meter 204 to adjust the conveying amount of the slurry.

[0045] In order to transport the slurry in the slurry preparation machine 201 to the grinding and classification unit 300, as Figure 1 As shown, the slurry regulating unit 200 further includes a slurry pump 206 , which is disposed on the slurry conveying pipe 202 . Preferably, the slurry pump 206 is disposed downstream of the second solenoid valve 203 and upstream of the second flow meter 204 .

[0046] In this embodiment, a second solenoid valve 203, a second flow meter 204, a second flow regulating valve 205 and a slurry pump 206 are provided on the slurry conveying pipe 202 to form a slurry conveying pipeline for conveying slurry, monitoring and regulating flow. The second solenoid valve 203, the slurry pump 206, the second flow meter 204 and the second flow regulating valve 205 are sequentially provided on the slurry conveying pipe 202.

[0047] Further, the water of the slurry preparation machine 201 can be provided by the water storage tank 101, so that Figure 1 As shown, a water delivery pipeline 400 is provided between the water storage tank 101 and the slurry configuration machine 201 . The water delivery pipeline 400 includes a water delivery pipe 401 . One end of the water delivery pipe 401 is connected to the water storage tank 101 , and the other end is connected to the slurry configuration machine 201 .

[0048] It is understandable that in order to control the on-off of the water delivery pipe 401, as Figure 1 As shown, the water delivery pipeline 400 further includes a third solenoid valve 402 , which is disposed on the water delivery pipe 401 and is used to control the on-off of the water delivery pipe 401 .

[0049] Considering the control of the amount of water delivered from the water storage tank 101 to the slurry preparation machine 201, Figure 1 As shown, the water delivery pipeline 400 also includes a third flow meter 403 and a third flow regulating valve 404. The third flow meter 403 and the third flow regulating valve 404 are both arranged on the water delivery pipe 401. Preferably, the third flow meter 403 is arranged downstream of the third solenoid valve 402, and the third flow regulating valve 404 is arranged downstream of the third flow meter 403.

[0050] In this embodiment, a third flow meter 403 and a third flow regulating valve 404 are provided on the water delivery pipe 401. The third flow regulating valve 404 is adjusted by observing the reading of the third flow meter 403 to achieve the purpose of adjusting the water delivery amount from the water storage tank 101 to the slurry preparation machine 201.

[0051] In order to provide power to the water in the water delivery pipe 401, as Figure 1 As shown, the water delivery pipeline 400 also includes a second high-pressure plunger pump 405, which is disposed on the water delivery pipe 401. Preferably, the second high-pressure plunger pump 405 is disposed downstream of the third solenoid valve 402 and upstream of the third flowmeter 403.

[0052] like Figure 1 and Figure 2As shown, the grinding self-grading unit 300 includes a grinding column 301 and a support frame 302. The support frame 302 is arranged outside the grinding column 301 and is used to support the grinding column 301. One end of the rising water flow delivery pipe 102 is connected to the water storage tank 101, and the other end is connected to the bottom of the grinding column 301. One end of the slurry delivery pipe 202 is connected to the slurry configuration machine 201, and the other end is connected to the middle of the grinding column 301.

[0053] Understandably, if Figure 1 and Figure 2 As shown, a feed inlet 3011 and a water inlet 3012 are provided on the grinding cylinder 301, the slurry conveying pipe 202 is connected to the feed inlet 3011, and the rising water flow conveying pipe 102 is connected to the water inlet 3012. The feed inlet 3011 is provided in the middle of the grinding cylinder 301, and there are multiple feed inlets 3011, and the multiple feed inlets 3011 are evenly distributed along the circumference of the grinding cylinder 301. In this embodiment, 4 to 8 feed inlets 3011 are provided at the bottom of the grinding cylinder 301, preferably 4. The water inlet 3012 is provided at the bottom of the grinding cylinder 301, and there are multiple water inlets 3012, and the multiple water inlets 3012 are evenly distributed around the bottom circumference of the grinding cylinder 301. In this embodiment, 4 to 8 water inlets 3012 are provided at the bottom of the grinding cylinder 301, and there are preferably 4.

[0054] like Figure 1 and Figure 2 As shown, the support frame 302 includes a support column 3021, a first annular disk 3022, a second annular disk 3023 and a support disk 3024, and the first annular disk 3022, the second annular disk 3023 and the support disk 3024 are arranged in sequence from top to bottom, and the support column 3021 is connected to the outer edges of the first annular disk 3022, the second annular disk 3023 and the support disk 3024, and the bottom of the grinding cylinder 301 is arranged on the support disk 3024, and the upper part of the grinding cylinder 301 is sleeved in the first annular disk 3022 and the second annular disk 3023, so as to support the grinding cylinder 301.

[0055] In this embodiment, the grinding cylinder 301 is disposed in the first annular disk 3022 and the second annular disk 3023 , and the support column 3021 is connected to the outer edges of the first annular disk 3022 and the second annular disk 3023 , thereby achieving stable support for the grinding cylinder 301 .

[0056] like Figure 1 and Figure 2As shown, the grinding self-grading unit 300 also includes a stirring mechanism 303, which includes a motor 3031, a stirring shaft 3032 and a stirring rod 3033. One end of the stirring shaft 3032 is connected to the motor 3031, and the stirring shaft 3032 is driven to rotate by the motor 3031. The other end of the stirring shaft 3032 is arranged in the grinding column 301. The stirring rod 3033 is evenly arranged on the stirring shaft 3032. For example, the stirring rod 3033 is provided with three layers on the stirring shaft 3032, and the stirring rods 3033 on both sides of the stirring shaft 3032 are staggered, or the stirring rods 3033 are radially arranged on the stirring shaft 3032. The motor 3031 is connected to the support column 3021 or the support plate 3024.

[0057] like Figure 1 and Figure 2 As shown, the grinding self-grading unit 300 also includes a water distribution plate 304 and a blocking orifice plate 305, which are arranged in parallel. The water distribution plate 304 is arranged at the bottom of the inner cavity of the grinding column 301, and the blocking orifice plate 305 is arranged in the middle of the grinding column 301. The space between the water distribution plate 304 and the bottom of the grinding column 301 is a buffer chamber 3013. The water in the water storage tank 101 first enters the buffer chamber 3013, and then passes through the water distribution plate 304 and is dispersed to the upper space of the grinding column 301. The space between the blocking orifice plate 305 and the water distribution plate 304 is a grinding chamber 3014, and the upper space of the blocking orifice plate 305 is a sedimentation chamber 3015. The slurry conveying pipe 202 is connected to the feed inlet 3011 arranged at the grinding chamber 3014. In this embodiment, the feed inlet 3011 is arranged between the sedimentation zone and the grinding zone. The fine minerals that meet the particle size requirements in the material to be ground move upward under the action of the drag force of the rising water flow, and directly enter the upper sedimentation chamber 3015 without being ground, and are discharged as qualified products. Pre-classification can effectively reduce the processing capacity of the mill, realize selective grinding, reduce grinding energy consumption, and improve grinding efficiency.

[0058] In order to prevent the grinding medium from entering the buffer chamber 3013 from the water distribution plate 304, the aperture of the water distribution plate 304 is smaller than the diameter of the grinding medium, and the preferred aperture of the water distribution plate 304 is 0.1-1 mm. In order to prevent the grinding medium from entering the settling chamber 3015 with the rising water flow and allow the product of the required particle size to pass through, the aperture of the blocking orifice plate 305 is smaller than the diameter of the grinding medium and larger than the particle size required by the product, and the preferred aperture is 0.5 mm.

[0059] It is understandable that the grinding medium is arranged in the grinding chamber 3014. In order to fill the grinding medium into the grinding chamber 3014, a filling port is also provided on the side wall of the grinding chamber 3014. After the grinding medium is filled, it is sealed. Exemplarily, a sealing cover with a thread is used for sealing.

[0060] like Figure 1 and Figure 2 As shown, the grinding self-classifying unit 300 further includes an inclined plate 306, which is arranged in the settling chamber 3015 and is provided with multiple layers. The inclination angle of the inclined plate 306, the spacing between adjacent inclined plates 306, and the length of the inclined plate 306 are adjusted according to the material characteristics and product requirements. Preferably, the inclination angle of the inclined plate 306 is 30-60°, the spacing between adjacent inclined plates 306 is 1-2 cm, and the length of the inclined plate 306 is 1-3 m. In this embodiment, multiple layers of parallel inclined plates 306 are provided in the settling chamber 3015, and the inclined plates 306 and the rising water flow cooperate to classify the ground minerals.

[0061] In this embodiment, a blocking orifice plate 305 is provided between the sedimentation chamber 3015 and the grinding chamber 3014 to convert the spiral upward flow in the grinding chamber 3014 into an upward flow, thereby reducing the interference of the grinding area on the sedimentation area, ensuring that the flow between the inclined plates 306 is laminar, and thus ensuring the accuracy of classification.

[0062] In order to enrich the minerals of lattice particle size, such as Figure 1 and Figure 2 As shown, the grinding self-classifying unit 300 also includes an overflow trough 307, which is arranged at the top of the sedimentation chamber 3015. Minerals with qualified particle sizes rising along the inclined plate 306 enter the overflow trough 307 and are discharged.

[0063] Example 2

[0064] Another specific embodiment of the present invention discloses a self-grading fluidized bed stirring grinding method, using the fluidized bed grinding device of Example 1, comprising the following steps:

[0065] Step 1: Fill the grinding chamber 3014 with grinding media.

[0066] Specifically, grinding media with moderate hardness are selected and added to the grinding chamber 3014. For example, the grinding media are ceramic balls or steel balls with Mohs hardness ≥ 9 and particle diameter of 1-8 mm. The amount of grinding media added is that the loose volume of the grinding media accounts for 50%-80% of the effective volume of the grinding chamber 3014.

[0067] The grinding media is spherical, and its size and proportion can be determined according to the type of material to be ground and the corresponding inlet and outlet fineness. The particle size of the grinding media satisfies the following formula:

[0068]

[0069] Among them, D p is the product demand granularity, D b is the size ratio between the grinding media and the material, D mis the average diameter of the grinding media, A and B are both experimental constants, the value range of A is between 0.1 and 10, and the value range of B is between -1 and 3.

[0070] Step 2: Mix the slurry.

[0071] The mineral to be ground and water (provided by the water storage tank 101) are added to the slurry preparation machine 201 and mixed evenly to form a slurry of a certain mass fraction (50-80%). The slurry in the slurry preparation machine 201 can enter the grinding chamber 3014 through the feed port 3011 in the slurry conveying pipe 202. The second flow regulating valve 205 and the second flow meter 204 are used in conjunction to display and adjust the flow of the slurry in real time.

[0072] Step 3: Fill the buffer chamber 3013 with water.

[0073] The water in the water storage tank 101 is used in conjunction with the first high-pressure plunger pump 104, the first flow regulating valve 106 and the first flow meter 105, and enters the buffer chamber 3013 from the water inlet 3012 through the rising water flow delivery pipe 102, and then enters the grinding chamber 3014 and the sedimentation chamber 3015 in turn after being evenly distributed through the water distribution plate 304.

[0074] The velocity of the rising water flow should be greater than the terminal velocity of the interference sedimentation of the product particle size, and the grinding time and grinding fineness of the mineral can be controlled by changing the water velocity. Assuming that the grinding time of the mineral is equal to the residence time in the grinding chamber 3014, the mineral floats at a uniform speed in the entire sub-classification device, and the specific volume relationship is as follows:

[0075]

[0076] Where T is the grinding time of the mineral, H is the height of the grinding chamber 3014, U is the rising water speed, and D p is the required particle size of the product, ρ is the density of the material, δ is the density of water, λ is the solid content of the slurry, n is the Richardson-Zaki index, which is in the range of 1.431-4.992, and C d is the drag coefficient.

[0077] Step 4: Start the stirred mill.

[0078] When the rising water flow fills the grinding chamber 3014 and the sedimentation chamber 3015, the stirring mechanism 303 is started, and the stirring mill is adjusted to a suitable speed so that the grinding media in the grinding chamber 3014 grinds the added materials due to the stirring action of the stirring rod 3033 in the grinding chamber 3014.

[0079] The stirring speed is adjusted according to the fineness of the material discharged. The relationship between the stirring power and the line speed is: The empirical formula of stirred mill is: Energy density (E) is defined as the power input divided by the slurry volume: Combining the above formulas, we can get the quantitative relationship between the edge linear velocity of the stirring rod 3033 and the discharge fineness:

[0080]

[0081] Among them, D 50 is the median particle size of the product, D m is the average diameter of the grinding media; v is the linear velocity of the stirring rod 3033 edge, D t is the diameter of the circle formed by the stirring rod 3033 during the rotation process, K and N are both empirical constants, depending on the specific material and grinding conditions, usually K is between 0.1 and 10 and N is between 0 and 3; V is the volume of the slurry in the grinding area, k is an empirical constant, dimensionless, and has a value range of 0.1 to 0.5. The preferred stirrer edge linear speed is 3-20 m / s.

[0082] Step 5: Inject slurry into the grinding chamber 3014.

[0083] Open the second solenoid valve 203 on the slurry conveying pipe 202, and wait for the grinding slurry to enter the grinding chamber 3014 for grinding. After grinding, the fine minerals that meet the particle size requirements and some unqualified coarse particles pass through the blocking orifice 305 under the action of the upward water flow and enter the sedimentation chamber 3015. The unqualified coarse particles have a large final sedimentation velocity (greater than the rising water flow velocity) and slide down along the inclined plate 306 to the grinding chamber 3014 to continue grinding; the small particles that meet the particle size requirements have a small final sedimentation velocity (less than the rising water flow velocity) and move upward along the inclined plate 306 to the overflow trough 307, and are finally discharged as qualified particle size minerals. The inclination angle, mutual distance and length of the inclined plate 306 are adjusted according to the material characteristics and product requirements, and the specific quantitative relationship is as follows:

[0084]

[0085] Among them, D p is the required particle size of the product; ρ is the density of the material, δ is the density of water, 1000kg / m 3 ; W is the amount of slurry passing through; B is the width of the inclined plates 306, L is the distance between the inclined plates 306, E is the length of the inclined plates 306, θ is the inclination angle of the inclined plates 306; λ is the solid content of the slurry; Re is the Reynolds number.

[0086] In this embodiment, the grinding process is carried out in the rising water flow, which can increase the fluidity of the ground material and the grinding medium in the lower stirring and grinding chamber 3014, reduce the torque acting on the stirring shaft 3032, reduce the wear rate, and extend the service life. The fine minerals that meet the particle size requirements in the fed materials to be ground directly enter the upper settling chamber 3015 without grinding under the drag of the rising water flow, and are discharged as qualified products; pre-classification can effectively reduce the processing capacity of the mill, realize selective grinding, reduce grinding energy consumption, and improve grinding efficiency. The coarse / fine minerals after grinding are classified once in the grinding area, and the fine particles are forced to be transported into the settling chamber 3015 to avoid over-grinding; secondary classification is carried out in the settling chamber 3015 to prevent the coarse particle minerals from floating up and accurately control the grinding particle size. In addition, the settling chamber 3015 is provided with multiple layers of inclined plates 306 to increase the settling area, accelerate the particle settling, and improve the classification efficiency and accuracy.

[0087] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A self-grading fluidized bed stirring and grinding device, characterized in that: The invention comprises a water supply control unit (100), a slurry control unit (200) and a grinding self-grading unit (300), wherein the grinding self-grading unit (300) comprises a grinding column (301), wherein the inner cavity of the grinding column (301) is divided from top to bottom into a sedimentation chamber (3015), a grinding chamber (3014) and a buffer chamber (3013), wherein the water supply control unit (100) is connected to the buffer chamber (3013), and the slurry control unit (200) is connected to the grinding chamber (3014).

2. The self-grading fluidized bed stirring and grinding device according to claim 1, characterized in that: The water supply control unit (100) comprises a water storage tank (101) and an ascending water flow delivery pipe (102); a water inlet (3012) is provided at the bottom of the grinding column (301); the water inlet (3012) is communicated with the grinding chamber (3014); one end of the ascending water flow delivery pipe (102) is connected to the water storage tank (101), and the other end is connected to the water inlet (3012).

3. The self-grading fluidized bed stirring and grinding device according to claim 2, characterized in that: The slurry control unit (200) comprises a slurry configuration machine (201) and a slurry conveying pipe (202); a feed port (3011) is provided in the middle of the grinding column (301); the feed port (3011) is communicated with the buffer chamber (3013); and the slurry configuration machine (201) is connected to the feed port (3011) via the slurry conveying pipe (202).

4. The self-grading fluidized bed stirring and grinding device according to claim 3, characterized in that: The feed inlet (3011) and the water inlet (3012) are both provided in plurality, and the plurality of feed inlets (3011) are evenly distributed along the outer circumference of the grinding chamber (3014), and the plurality of water inlets (3012) are evenly distributed along the bottom circumference of the grinding cylinder (301).

5. The self-grading fluidized bed stirring and grinding device according to claim 2, characterized in that: The water supply control unit (100) further comprises a first electromagnetic valve (103) and a first high-pressure plunger pump (104); the first electromagnetic valve (103) and the first high-pressure plunger pump (104) are both arranged on the rising water flow conveying pipe (102).

6. The self-grading fluidized bed stirring and grinding device according to claim 3, characterized in that: The slurry regulating unit (200) further comprises a second solenoid valve (203) and a slurry pump (206); the second solenoid valve (203) and the slurry pump (206) are both arranged on the slurry conveying pipe (202), and the slurry pump (206) is located downstream of the second solenoid valve (203).

7. The self-grading fluidized bed stirring and grinding device according to claim 3, characterized in that: It also includes a water delivery pipeline (400), wherein the water delivery pipeline (400) is connected to the water storage tank (101) and the slurry preparation machine (201).

8. The self-grading fluidized bed stirring and grinding device according to claim 7, characterized in that: The water delivery pipeline (400) comprises a water delivery pipe (401), a third solenoid valve (402) and a second high-pressure plunger pump (405).

9. The self-grading fluidized bed stirring and grinding device according to any one of claims 1 to 8, characterized in that: The grinding self-grading unit (300) further comprises a support frame (302) for supporting the grinding cylinder (301).

10. A fluidized bed stirring and grinding method, characterized in that: The fluidized bed stirring and grinding operation is carried out using the self-grading fluidized bed stirring and grinding device described in any one of claims 1 to 9.

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