CN113953063A - Drying, grinding and powder selecting integrated ball milling system for high-moisture materials - Google Patents
Drying, grinding and powder selecting integrated ball milling system for high-moisture materials Download PDFInfo
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- CN113953063A CN113953063A CN202111208959.0A CN202111208959A CN113953063A CN 113953063 A CN113953063 A CN 113953063A CN 202111208959 A CN202111208959 A CN 202111208959A CN 113953063 A CN113953063 A CN 113953063A
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- 239000000843 powder Substances 0.000 title claims abstract description 145
- 238000000227 grinding Methods 0.000 title claims abstract description 107
- 239000000463 material Substances 0.000 title claims abstract description 68
- 238000001035 drying Methods 0.000 title claims abstract description 43
- 238000000498 ball milling Methods 0.000 title claims abstract description 25
- 230000003068 static effect Effects 0.000 claims abstract description 68
- 238000005192 partition Methods 0.000 claims abstract description 44
- 239000000428 dust Substances 0.000 claims abstract description 21
- 238000007599 discharging Methods 0.000 claims abstract description 15
- 239000002994 raw material Substances 0.000 claims abstract description 15
- 239000002028 Biomass Substances 0.000 claims abstract description 9
- 238000002485 combustion reaction Methods 0.000 claims abstract description 9
- 239000002390 adhesive tape Substances 0.000 claims abstract description 5
- 230000005540 biological transmission Effects 0.000 claims description 12
- 230000004913 activation Effects 0.000 claims description 7
- 238000000034 method Methods 0.000 abstract description 13
- 238000005265 energy consumption Methods 0.000 abstract description 8
- 230000008569 process Effects 0.000 abstract description 8
- 229910000831 Steel Inorganic materials 0.000 description 10
- 238000004519 manufacturing process Methods 0.000 description 10
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- 230000009471 action Effects 0.000 description 6
- 239000004568 cement Substances 0.000 description 6
- 238000012216 screening Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 229910001220 stainless steel Inorganic materials 0.000 description 4
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- 238000004134 energy conservation Methods 0.000 description 3
- 230000005484 gravity Effects 0.000 description 3
- 239000002893 slag Substances 0.000 description 3
- 208000005156 Dehydration Diseases 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000005054 agglomeration Methods 0.000 description 2
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- 238000010438 heat treatment Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C21/00—Disintegrating plant with or without drying of the material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
- B02C17/10—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls with one or a few disintegrating members arranged in the container
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
- B02C17/18—Details
- B02C17/183—Feeding or discharging devices
- B02C17/186—Adding fluid, other than for crushing by fluid energy
- B02C17/1875—Adding fluid, other than for crushing by fluid energy passing gas through crushing zone
- B02C17/1885—Adding fluid, other than for crushing by fluid energy passing gas through crushing zone the applied gas acting to effect material separation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
- B02C17/18—Details
- B02C17/183—Feeding or discharging devices
- B02C17/186—Adding fluid, other than for crushing by fluid energy
- B02C17/1875—Adding fluid, other than for crushing by fluid energy passing gas through crushing zone
- B02C17/189—Adding fluid, other than for crushing by fluid energy passing gas through crushing zone with return of oversize material to crushing zone
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
Abstract
The invention discloses a drying, grinding and powder selecting integrated ball milling system for high-moisture materials, which comprises a pressure filter, a raw material bin, a biomass combustion furnace, a self-sorting type ball mill, a dust collector and a fan, wherein the pressure filter, an adhesive tape machine, the raw material bin, a metering device, the self-sorting type ball mill, the dust collector and the fan are sequentially connected; the self-sorting ball mill supplies energy through the biomass combustion furnace; the self-sorting ball mill comprises a cylinder, a feeding hole and a discharging hole, wherein the cylinder is inclined upwards from the side of the feeding hole to the side of the discharging hole; a drying bin, a grinding bin and a powder selecting bin are sequentially arranged in the barrel from a feeding hole to a discharging hole, a main partition panel II is arranged between the drying bin and the grinding bin, and a main partition panel I is arranged between the grinding bin and the powder selecting bin; the powder selecting bin is internally provided with a static powder selecting machine and/or a dynamic powder selecting machine. The invention integrates drying, grinding and sorting into a whole, and the sorted materials are collected in the dust collector, thereby reducing the process flow, improving the wind efficiency of the system and reducing the wind energy consumption of the system.
Description
Technical Field
The invention relates to the technical field of powder grinding, in particular to a drying, grinding and powder selecting integrated ball milling system for high-moisture materials.
Background
The ball mill comprises a cylinder and a grinding body, when the ball mill cylinder rotates, the grinding body is attached to a cylinder lining plate and taken away by the cylinder due to the action of inertia, centrifugal force and friction force, when the ball mill cylinder is taken to a certain height, the ball mill is thrown down due to the gravity action of the ball mill cylinder, and the thrown-down grinding body crushes materials under the action of gravity and impact force to realize material grinding. The ball mill has simple structure and good equipment reliability, and is widely applied to industries such as building materials, mineral separation, metallurgy, electric power, medicine, food, chemical industry and the like. The ball mill can be divided into a dry type and a wet type according to different grinding environments; according to different transmission modes, the transmission mode can be divided into a center transmission mode and an edge transmission mode.
Although the ball mill has a simple structure, the grinding principle of the ball mill is single-particle impact crushing, the grinding efficiency is low, and a large amount of energy is converted into potential energy for lifting the steel balls and the materials, kinetic energy for impact between the steel balls and grinding heating during material grinding. Research data show that the energy utilization rate of the ball mill is less than 5%. Because the thick and thin materials in the ball mill are mixed, the fine powder meeting the product requirement is easy to agglomerate in the mill, the agglomerated materials are bonded on the lining plate to form a cushion layer, and researches show that when the cushion layer of the lining plate is 0.2mm, the impact force of the steel ball is reduced by 80%. The external embodiment is that the ball mill has the problems of ball pasting, full grinding and the like, so that the ball mill cannot be normally produced, or the production energy consumption is very high during the production of the ball mill. Zhou good (cement technology, 6 th year 2014) introduced a technology of grinding ultrafine cement grouting material by using a phi 2.6 x 13m ball mill, and when the ultrafine cement is completely produced by using P.O 52.5 cement, the ball is seriously pasted by the mill; when the output of the superfine cement is too low after all the clinker and the gypsum are used for grinding,the power consumption is too high. The scheme adopted finally is as follows: 70 percent of P.O 52.5 is adopted, and 30 percent of clinker and gypsum are added, so that continuous normal production of a mill can be ensured; after grinding, 8 percent of silica fume (specific surface area 2000 m) is added2/kg) are put into a powder concentrator together to realize that the specific surface area of the product is more than or equal to 800m2And the power consumption of the working procedure is up to 155 kW/t.
Therefore, in order to improve the yield of the ball mill system and reduce the grinding energy consumption, a powder concentrator technology gradually appears. The method comprises the following steps: and (3) sending the material ground by the ball mill into a powder selecting machine through a lifter, so that qualified materials are selected in time in the powder selecting machine, and unqualified materials return to the ball mill for continuous grinding. Due to the appearance and maturity of the powder concentrator technology, the power consumption of a grinding system of the ball mill is greatly reduced, but materials need to be lifted to the top of the powder concentrator due to the limitation of process arrangement, so that the equipment is increased, the civil engineering cost is increased, and the investment cost is high.
Chinese patent publication No. CN201197950 discloses an internal selection powder screening composite cement mill, which comprises a cylinder and an internal screening device, wherein the internal screening device comprises a grate plate, a coarse powder guide cone, a tubular screen, a fine powder guide cone and an annular pipe. One end of the tubular sieve is arranged on the circumferential surface of the annular pipe and is communicated with the annular pipe, the other end of the tubular sieve is arranged on the inner wall of the cylinder body, and the annular pipe is provided with a coarse powder guide cone and a fine powder guide cone at the end, and the tubular sieve further comprises a sieve plate, a ventilation grate plate and a material blocking inclined plate. The ventilation grate plate is arranged at the other end of the annular pipe, the sieve plate is arranged between the tubular sieve and the ventilation grate plate, one side surface of the tubular sieve is arranged on the sieve plate, and the material blocking inclined plate is arranged on the edge of the outer end of the sieve surface of the tubular sieve. The essence of the method is that the functions of the partition board are supplemented, and a grate board is arranged in front of the original partition board, but the method has no substantial internal selection and screening functions.
Chinese patent publication No. CN101920219A discloses an internal powder selecting device for a dry ball mill, which is characterized in that a stainless steel powder selecting pipe is installed in an inner cavity of the dry ball mill, and is connected with a powder selecting connecting pipe i and a powder selecting connecting pipe ii of a mill tail separation bin in parallel, a finished product conveying pipe, a catcher (cyclone and cloth bag type dust remover group), a fan, a stainless steel material return pipe, and a ball mill are sequentially connected in an air and material closed circuit. The powder selecting pipe timely selects finished materials formed by grinding the mill interior and mill tail in a negative pressure state by utilizing the suction force of the fan. The core of the method is that a steel pipe is arranged in a grinding bin of the ball mill, and a finished product is selected out through the steel pipe under the action of negative pressure. The stainless steel powder selecting pipe is arranged in the grinding bin, and the steel ball is thrown down to easily deform the steel pipe, so that the stainless steel powder selecting pipe has no practicability; in addition, the powder is drawn out of the steel pipe by the negative pressure, and the powder sorting function is not provided.
In addition, when a ball mill is adopted to treat high-moisture materials at present, in order to ensure the drying effect of the ball mill and avoid the ball-pasting phenomenon caused by large moisture, the ventilation air speed in the mill is high, the ball mill cannot be used as final grinding equipment, an external powder concentrator is needed, and the occupied area of a grinding workshop is large and the investment cost is high. In addition, the ventilation air speed in the mill is high, the air after drying the materials is discharged outside the mill by the ball mill in time, the effective utilization rate of the wind energy is low, the ventilation power consumption of the system is high, and the production cost is high.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides an integrated ball milling system for drying, grinding and powder selecting of high-moisture materials, the ball milling system can integrate drying, grinding and selecting, the selected materials are collected in a dust collector, the process flow is reduced, the air consumption efficiency of the system is improved, compared with the traditional circulation system, the air consumption is reduced by 50-70%, and the air consumption energy consumption of the system is reduced. Meanwhile, the phenomenon of fine powder agglomeration or over-grinding in the ball mill is reduced, the workshop height is reduced, the investment cost of a grinding system is reduced, the grinding energy consumption of the ball mill is reduced, the grinding efficiency is improved, the energy utilization rate is increased, and energy conservation and emission reduction are promoted.
The invention is realized in this way, a drying, grinding and powder selecting integrated ball milling system for high-moisture materials comprises a pressure filter, a raw material bin, a biomass combustion furnace, a self-sorting ball mill, a dust collector and a fan, wherein the pressure filter is connected with an inlet of the raw material bin through an adhesive tape machine, an outlet of the raw material bin is connected with a feed inlet of the self-sorting ball mill through a metering device, a discharge outlet of the self-sorting ball mill is connected with an inlet of the dust collector, and an air outlet of the dust collector is connected with the fan; the self-sorting ball mill supplies energy through a biomass combustion furnace;
the self-sorting ball mill comprises a barrel, a feeding hole and a discharging hole, wherein the barrel inclines upwards from the side of the feeding hole to the side of the discharging hole, and the inclination angle is 2-5 degrees; a drying bin, a grinding bin and a powder selecting bin are sequentially arranged in the barrel from a feeding hole to a discharging hole, a main partition panel II is arranged between the drying bin and the grinding bin, and a main partition panel I is arranged between the grinding bin and the powder selecting bin; and a static powder concentrator and/or a dynamic powder concentrator are arranged in the powder concentration bin.
Preferably, the feeding port is provided with a feeding conveying reamer, and an external fixing structure is adopted and does not rotate along with the barrel.
Preferably, set up a plurality of devices of breaing up in the stoving storehouse, the height of breaing up the device is 10 ~ 25% of barrel diameter, and the clearance is 100 ~ 400mm between two adjacent devices of breaing up.
Preferably, a second vent hole positioned in the central area and a second grate seam positioned around the second vent hole are formed in the second main partition plate, and the edge area close to the second main partition plate is a blind plate; the center of the second vent hole is coaxial with the mill cylinder, and the second vent hole is of a net structure; the second grate seam is a conical grate seam, and the diameter of the second grate seam is gradually increased from the side of the drying bin to the side of the grinding bin.
Preferably, an inclined lining plate is arranged on the inner wall of the powder selecting bin, and an included angle between the inclined lining plate and the axis of the barrel is 3-15 degrees.
Preferably, the dynamic powder concentrator is composed of a rotor, a counterattack cone, a transmission shaft and a powder concentrator drive, blades of the rotor are parallel to an inclined lining plate in the powder concentrator, the counterattack cone is fixed at one end of the rotor close to the feeding side, and the diameter of the counterattack cone is the same as the outer diameter of the rotor; the rotor is connected with the powder concentrator through a transmission shaft for driving.
Preferably, when only the dynamic powder concentrator is arranged in the powder concentration bin, a first vent hole positioned in a central area and a first grate seam positioned on the periphery are arranged on the first main partition board, the center of the first vent hole is coaxial with the mill barrel, and the first vent hole is of a net structure; the grate seam one close to the periphery of the vent hole one is a conical grate seam, and the diameter of the grate seam one is gradually increased from the grinding bin side to the powder selecting bin side; the first grate seam close to the edge area of the main partition board is a long strip-shaped grate seam.
Preferably, when the powder selecting bin is internally provided with the static powder selecting machine and the dynamic powder selecting machine, the static blades of the static powder selecting machine are arranged in a conical shape, and the static powder selecting machine is positioned between the first main partition board and the dynamic powder selecting machine.
Preferably, the static powder concentrator comprises static blades which are arranged in a conical manner or are arranged in parallel with the axis of the cylinder;
when the static blades are arranged in a conical shape, the included angle between the static blades and the axis of the barrel is 45-65 degrees, the diameter of the section of the cone of the static blades is gradually increased from the grinding bin side to the powder selecting bin side, one end, close to the grinding bin, of each static blade is fixed on the first main partition board, and the other end of each static blade is fixed on the barrel; at the moment, the inner area of the first main partition board intersected with the conical static blades is a blind plate, and the outer area is provided with a grid seam;
when the static blades are arranged in parallel with the axis of the cylinder body, one end of each static blade close to the grinding bin is fixed on the first main bin partition plate, and the other end of each static blade is fixed on the cylinder body; at the moment, the inner area of the first main partition board intersected with the static blades is a blind plate, and the outer area is provided with a grid seam.
Preferably, the grinding lining plate is arranged on the inner wall of the barrel body of the grinding bin, and a plurality of activation rings are arranged in the grinding bin.
The invention has the following advantages and beneficial effects:
1) the ball milling system integrates drying, grinding and sorting, reduces the process flow and improves the air consumption efficiency of the system for the treatment of wet materials, and compared with the traditional circulation system, the ball milling system reduces the air consumption by 50-70%, and reduces the energy consumption of the air consumption of the system.
2) According to the ball milling system, the grinding and sorting of the materials are completed in the ball mill, so that qualified fine powder generated in the grinding process can be discharged in time, the excessive grinding of the materials in the ball mill is reduced, the power consumption of grinding is saved, and the energy conservation and emission reduction of production enterprises are facilitated; the external powder concentrator is not needed, the height and the occupied area of a factory building can be effectively reduced, auxiliary equipment such as a hoister and a conveying chute can be reduced, the investment cost is saved, the equipment failure rate is reduced, and the production and maintenance cost is reduced.
3) The ball milling system can shorten the time for adjusting the quality of finished products, adjust the material quantity and the finished product quantity in the ball mill in real time, efficiently control the yield, improve the production efficiency and reduce the production cost.
4) According to the ball milling system, the powder selecting machine and the ball mill are on the same horizontal plane, and the height of the powder selecting machine of the traditional circulation system is 2-3 times of that of the ball mill, so that compared with the traditional circulation (ball mill and powder selecting machine) system, the self-sorting ball mill disclosed by the invention has the advantages that the height of the lifted material is reduced, the potential energy required to be overcome is reduced, and the production energy consumption of the system is saved.
5) The ball milling system of the invention cancels auxiliary equipment such as a lifter, a conveying chute and the like, reduces pollution points of leakage and leakage in the system, reduces disordered discharge of dust, and is beneficial to clean production and environmental protection.
Drawings
Fig. 1 is a flow chart of an integrated ball milling system for drying, grinding and powder selection of high-moisture materials according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a self-sorting ball mill according to a first embodiment of the present invention;
FIG. 3 is a front view of a second main partition panel according to a first embodiment of the present invention;
FIG. 4 is a cross-sectional view of a second main partition panel according to a first embodiment of the present invention;
FIG. 5 is a schematic structural diagram of an activation ring provided in accordance with one embodiment of the present invention;
FIG. 6 is a front view of a first main compartment plate according to a first embodiment of the present invention;
FIG. 7 is a cross-sectional view of a first main compartment plate according to a first embodiment of the present invention;
FIG. 8 is a schematic structural diagram of a self-classifying ball mill provided in the second embodiment of the present invention;
FIG. 9 is a front view of a first main compartment plate according to a second embodiment of the present invention;
FIG. 10 is a sectional view of a first main compartment plate according to a second embodiment of the present invention;
FIG. 11 is a schematic structural diagram of a self-sorting ball mill provided in the third embodiment of the present invention;
FIG. 12 is a front view of a first main compartment plate according to a third embodiment of the present invention;
FIG. 13 is a cross-sectional view of a first main compartment plate according to a third embodiment of the present invention.
In the figure: 1. a filter press; 2. a tape machine; 3. a raw material bin; 4. a self-sorting ball mill; 5. a dust collector; 6. a fan; 7, a biomass combustion furnace;
10. a barrel; 101. a feed inlet; 102. a discharge port; 103. a dust collection port;
20. a grinding bin; 201. grinding the lining plate; 202. an activation ring;
30. a powder selecting bin; 301. an inclined lining plate; 310. a dynamic powder concentrator; 311. a rotor; 312. a counterattack cone; 313. a drive shaft; 314. driving the powder concentrator; 320. static powder selecting machine; 321. a static blade;
40. a first main partition panel; 401. a first ventilation hole; 402. a first grate seam;
50. a drying bin; 501. feeding and conveying reamer; 502. a breaking device;
60. a second main partition panel; 601. a second air vent; 602. and a second grate seam.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be interpreted broadly, e.g., as being fixed or detachable or integrally connected; may be a mechanical connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example 1
Referring to fig. 1, the present embodiment provides an integrated ball milling system for drying, grinding and selecting powder of high-moisture materials, which includes a filter press 1, a raw material bin 3, a biomass combustion furnace 7, a self-sorting ball mill 4, a dust collector 5 and a fan 6. The filter press 1 is connected with an inlet of a raw material bin 3 through an adhesive tape machine 2, an outlet of the raw material bin 3 is connected with a feeding hole 101 of a self-sorting ball mill 4 through a metering device, a discharging hole 102 of the self-sorting ball mill 4 is connected with an inlet of a dust collector 5, and an air outlet of the dust collector 5 is connected with a fan 6. The biomass combustion furnace 7 is a heat supply system of the self-sorting ball mill 4.
The filter press 1 carries out primary dehydration on steel slag iron removal tail mud, the tail mud after primary dehydration is conveyed into a raw material bin 3 through an adhesive tape machine 2, materials discharged from the raw material bin 3 are metered by a metering device to enter a feeding conveying reamer 501 at a feed inlet 101 of a self-sorting ball mill 4, the materials are conveyed into the self-sorting ball mill 4 through the feeding conveying reamer 501, the materials are dried, ground and sorted in the self-sorting ball mill 4, sorted finished products are collected through a dust collector 5 and conveyed to a finished product bin through a conveying chute to be stored, waste gas discharged out of the dust collector 5 is discharged into a chimney through a fan 6, and finally the waste gas is discharged into the atmosphere.
Referring to fig. 2 to 7, the self-sorting ball mill 4 includes a cylinder 10, a feeding port 101, and a discharging port 102, wherein the cylinder 10 is inclined upward from the feeding port 101 side to the discharging port 102 side at an angle of 2 to 5 °; the barrel 10 is driven to rotate by a mill drive (the mill drive is not shown in the figure, and the barrel 10 can be driven to rotate by a gear transmission or other modes), and a drying bin 50, a grinding bin 20 and a powder selecting bin 30 are sequentially arranged in the barrel 10 from a feeding hole 101 to a discharging hole 102.
The feeding hole 101 is provided with a feeding conveying reamer 501 which adopts an external fixed structure and does not rotate along with the cylinder 10. The wet material is spirally conveyed into the drying bin 50 through a feeding conveying reamer 501.
A plurality of scattering devices 502 are arranged in the drying bin 50 and used for fully scattering materials, so that wet materials are dried in the drying bin 50; the height of the scattering devices 502 is 10-25% of the diameter of the cylinder 10, and the gap between every two adjacent scattering devices 502 is 100-400 mm.
And a second main partition plate 60 is arranged between the drying bin 50 and the grinding bin 20, and the thickness of the second main partition plate 60 is 20-50 mm. A second vent hole 601 positioned in the central area and a second grate seam 602 positioned around the second vent hole 601 are arranged on the second main partition board 60, and the edge area close to the second main partition board 60 is a blind plate; the center of the second vent hole 601 is coaxial with the mill cylinder 10, the diameter of the second vent hole 601 is 0.3-0.6 times of that of the mill cylinder 10, the second vent hole 601 is of a net structure, and the effective size of a mesh hole is 15-30 mm; the second grate seam 602 is a conical grate seam, the diameter of the second grate seam 602 is gradually increased from the side of the drying bin 50 to the side of the grinding bin 20, the diameter of the second grate seam 602 close to the side of the drying bin 50 is 10-15 mm, and the diameter of the second grate seam 602 close to the side of the grinding bin 20 is 20-30 mm, so that the grate seam is not easy to block.
The inner wall of the cylinder body 10 of the grinding bin 20 is provided with a grinding lining plate 201, and the grinding lining plate 201 is parallel to the axis of the cylinder body 10; the activation rings 202 are arranged in the grinding bin 20, so that the material retention time can be increased, the material grinding time can be prolonged, the specific structures of the activation rings 202 can be selected according to needs, and only one of the activation rings is illustrated in the embodiment. The grinding bin 20 is 1 bin or a plurality of bins, and when a plurality of bins are adopted, a bin separating plate is arranged between the bins.
An inclined lining plate 301 is arranged on the inner wall of the barrel 10 of the powder selecting bin 30, the inner diameter of the inclined lining plate 301 is gradually reduced from the feeding end of the powder selecting bin 30 to the discharging end of the powder selecting bin 30, and the included angle between the inclined lining plate 301 and the axis of the barrel 10 is 3-15 degrees. The powder selecting bin 30 is internally provided with a dynamic powder selecting machine 310, the dynamic powder selecting machine 310 consists of a rotor 311, an impact cone 312, a transmission shaft 313 and a powder selecting machine drive 314, blades of the rotor 311 are parallel to the inclined lining plate 301, the impact cone 312 is fixed at one end of the rotor 311 close to the feeding side, the diameter of the impact cone 312 is the same as the outer diameter of the rotor 311, and the impact cone 312 is used for controlling the speed of a material entering the dynamic powder selecting machine 310 and reducing the impact of the material on the blades of the dynamic powder selecting machine 310; secondly, if the bottom adopts the blind plate structure, the materials and the gas impact on the dynamic powder concentrator 310 at 90 degrees, and the gas has no guiding function when entering the blades of the dynamic powder concentrator 310, so that the general wind resistance is large. The rotor 311 is connected with a powder concentrator drive 314 outside the powder concentrator 30 through a transmission shaft 313, specifically, the powder concentrator drive 314 comprises a speed reducer and a motor, and the transmission shaft 313 is connected with the motor through the speed reducer.
A first main partition board 40 is arranged between the grinding bin 20 and the powder selecting bin 30, and the thickness of the first main partition board 40 is 20-50 mm. The first main partition board 40 is provided with a first vent hole 401 positioned in a central area and a first grate seam 402 positioned on the periphery, the center of the first vent hole 401 is coaxial with the mill cylinder 10, the diameter of the first vent hole 401 is 0.2-0.4 times of the diameter of the mill cylinder 10, the first vent hole 401 is of a net structure, and the effective size of a mesh hole is 10-15 mm; a first grate seam 402 close to the periphery of the first vent 401 is a conical grate seam, the diameter of the first grate seam 402 is gradually increased from the side of the grinding bin 20 to the side of the powder selecting bin 30, the diameter of the first grate seam 402 close to the side of the grinding bin 20 is 4-10 mm, and the diameter of the first grate seam 402 close to the side of the powder selecting bin 30 is 6-12 mm; the first grid slit 402 close to the edge area of the first main partition board 40 is in a long strip shape, and the length is 25mm, and the width is 4 mm.
The materials enter the drying bin 50 from the feeding hole 101 through the feeding conveying reamer 501, the materials move from the drying bin 50 to the grinding bin 20 under the action of hot air, the materials enter the powder selecting bin 30 from the grinding bin 20, and the materials are sorted inside and outside the powder selecting bin 30; the sorted finished products are discharged from the discharge port 102 through the dynamic powder sorting machine 310, enter the next process, and the sorted non-finished products return to the grinding bin 20 again to be ground again under the action of gravity and centrifugal force, and enter the next circulation. Drying, grinding and sorting are integrated into a whole by the self-sorting ball mill, wet materials are treated, the process flow is reduced, the air efficiency for the system is improved, and compared with the traditional circulation system, the air quantity is reduced by 50-60%, and the air energy consumption for the system is reduced. Qualified fine powder generated in the grinding process is discharged in time, over-grinding of materials in the ball mill is reduced, fine powder agglomeration or ball pasting is reduced, grinding efficiency is improved, grinding power consumption is reduced, the height of a factory building is reduced, investment cost is saved, and energy conservation and environmental protection are facilitated.
The self-sorting ball mill is suitable for materials with the water content of the grinding raw materials being 2-10% and the granularity of the ground products being less than 80 mu m, and can be used for processing high-moisture materials such as wet fly ash, wet discharged slag, wet discharged steel slag tail mud and the like in the field of building materials.
Example 2
Referring to fig. 8 to 10, different from embodiment 1, a static powder concentrator 320 is further disposed in the powder concentrator 30 of this embodiment, and the static powder concentrator 320 is located between the first main partition plate 40 and the dynamic powder concentrator 310.
The static powder concentrator 320 comprises static blades 321, the static blades 321 are arranged in a conical shape, an included angle between each static blade 321 and the axis of the barrel 10 is 45-65 degrees, the diameter of the section of the cone of each static blade 321 is gradually increased from the grinding bin 20 side to the powder concentration bin 30 side, one end, close to the grinding bin 20, of each static blade 321 is fixed on the corresponding main partition board I40, the other end of each static blade 321 is fixed on the corresponding barrel 10, the other end of each static blade is fixed on the inclined lining board 301 in the powder concentration bin 30, and the connection positions of the static blades 321 and the barrel 10 are connected in a welding mode. The length of the static blades 321 in the axial direction accounts for 15-25% of the length of the powder selecting bin 30, the width of each static blade 321 is 50-300 mm, and the gap between every two adjacent static blades 321 is 50-400 mm.
At this time, the inner region where the first main partition panel 40 and the conical static blades 321 intersect is a blind panel, the first vent holes 401 are not arranged, the outer region is provided with grid gaps, and the structure of the grid gaps is the same as the structure of the grid gaps 402 on the first main partition panel 40 in the embodiment 1.
After the materials enter the powder selecting bin 30 from the grinding bin 20, first powder selection is carried out on the conical static blades 321, then the fine powder passing through the static blades 321 is subjected to second powder selection through the dynamic powder selecting machine 310, the products after the second powder selection are finished products, and the semi-coarse powder not passing through the rotor 311 returns to the grinding bin 20 again to enter the next circulation.
Example 3
Referring to fig. 11 to 13, different from embodiment 1, the powder selecting bin 30 of the present embodiment is not provided with the dynamic powder selecting machine 310, but only provided with the static powder selecting machine 320, and the ratio of the length of the powder selecting bin 30 to the length of the whole ball mill cylinder 10 is 15 to 40%.
The static blades 321 of the static powder concentrator 320 are arranged parallel to the axis of the barrel 10, one end of each static blade 321 close to the grinding bin 20 is fixed on the first main partition board 40, the other end of each static blade 321 is fixed on the barrel 10, the connection positions are connected in a welding mode, and the static blades 321 occupy the whole powder concentrating bin 30. Each static blade 321 has a width of 50-300 mm, and a gap between two adjacent static blades 321 is 100-400 mm. The static blades 321 rotate along with the cylinder 10 to perform the function of coarse screening of materials.
At this time, the inner region where the first main partition panel 40 and the static blades 321 intersect is a blind plate, the outer region is provided with a grid seam, and the grid seam is a long-strip grid seam.
In this embodiment, only the static powder concentrator 320 is provided, so that the whole ball mill can be arranged in a symmetrical structure, and materials can be fed from two ends of the ball mill and discharged from the middle of the ball mill.
In addition, the static vanes 321 of the static powder concentrator 320 in this embodiment may also be provided in a conical arrangement.
After the materials enter the powder selecting bin 30 from the grinding bin 20, the fine materials after being selected by the static blades 321 enter the finished products along with the airflow and are discharged from the discharge port 102, and the coarse materials return to the grinding bin 20 and enter the next cycle until the finished products are obtained. The present embodiment further provides a dust collecting opening 103 above the discharging opening 102 for collecting dust.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: it is to be understood that modifications may be made to the technical solutions described in the foregoing embodiments, or some or all of the technical features may be equivalently replaced, and the modifications or the replacements may not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. The drying, grinding and powder selecting integrated ball milling system for the high-moisture materials is characterized by comprising a filter press, a raw material bin, a biomass combustion furnace, a self-sorting type ball mill, a dust collector and a fan, wherein the filter press is connected with an inlet of the raw material bin through an adhesive tape machine, an outlet of the raw material bin is connected with a feed inlet of the self-sorting type ball mill through a metering device, a discharge outlet of the self-sorting type ball mill is connected with an inlet of the dust collector, and an air outlet of the dust collector is connected with the fan; the self-sorting ball mill supplies energy through a biomass combustion furnace;
the self-sorting ball mill comprises a barrel, a feeding hole and a discharging hole, wherein the barrel inclines upwards from the side of the feeding hole to the side of the discharging hole, and the inclination angle is 2-5 degrees; a drying bin, a grinding bin and a powder selecting bin are sequentially arranged in the barrel from a feeding hole to a discharging hole, a main partition panel II is arranged between the drying bin and the grinding bin, and a main partition panel I is arranged between the grinding bin and the powder selecting bin; and a static powder concentrator and/or a dynamic powder concentrator are arranged in the powder concentration bin.
2. The drying, grinding and powder selecting integrated ball milling system for the high-moisture materials as claimed in claim 1, wherein a feeding conveying reamer is arranged at the feeding port, and the feeding conveying reamer adopts an external fixed structure and does not rotate along with the barrel.
3. The drying, grinding and powder selecting integrated ball milling system for the high-moisture materials as claimed in claim 1, wherein a plurality of scattering devices are arranged in the drying bin, the height of each scattering device is 10-25% of the diameter of the cylinder, and the gap between every two adjacent scattering devices is 100-400 mm.
4. The drying, grinding and powder selecting integrated ball milling system for the high-moisture materials as claimed in claim 1, wherein a second vent hole located in a central region and a second grate seam located around the second vent hole are formed in the second main partition plate, and a blind plate is arranged in an edge region close to the second main partition plate; the center of the second vent hole is coaxial with the mill cylinder, and the second vent hole is of a net structure; the second grate seam is a conical grate seam, and the diameter of the second grate seam is gradually increased from the side of the drying bin to the side of the grinding bin.
5. The drying, grinding and powder selecting integrated ball milling system for the high-moisture materials as claimed in claim 1, wherein an inclined lining plate is arranged on the inner wall of the barrel of the powder selecting bin, and the inclined lining plate forms an included angle of 3-15 degrees with the axis of the barrel.
6. The drying, grinding and powder selecting integrated ball milling system for the high-moisture materials according to claim 1, wherein the dynamic powder selecting machine is driven by a rotor, a counterattack cone, a transmission shaft and a powder selecting machine, blades of the rotor are parallel to an inclined lining plate in a powder selecting bin, the counterattack cone is fixed at one end of the rotor close to a feeding side, and the diameter of the counterattack cone is the same as the outer diameter of the rotor; the rotor is connected with the powder concentrator through a transmission shaft for driving.
7. The drying, grinding and powder selecting integrated ball milling system for the high-moisture materials as claimed in claim 1, wherein when only the dynamic powder selecting machine is arranged in the powder selecting bin, a first vent hole positioned in a central area and a first grate seam positioned on the periphery are arranged on the first main partition board, the center of the first vent hole is coaxial with a mill barrel, and the first vent hole is of a net-shaped structure; the grate seam one close to the periphery of the vent hole one is a conical grate seam, and the diameter of the grate seam one is gradually increased from the grinding bin side to the powder selecting bin side; the first grate seam close to the edge area of the main partition board is a long strip-shaped grate seam.
8. The drying, grinding and powder selecting integrated ball milling system for the high-moisture materials as claimed in claim 1, wherein when a static powder selecting machine and a dynamic powder selecting machine are arranged in the powder selecting bin, static blades of the static powder selecting machine are arranged in a conical shape, and the static powder selecting machine is located between the first main partition board and the dynamic powder selecting machine.
9. The drying, grinding and powder selecting integrated ball milling system for high-moisture materials according to claim 1, wherein the static powder concentrator comprises static blades which are arranged in a conical shape or in parallel with the axis of the cylinder;
when the static blades are arranged in a conical shape, the included angle between the static blades and the axis of the barrel is 45-65 degrees, the diameter of the section of the cone of the static blades is gradually increased from the grinding bin side to the powder selecting bin side, one end, close to the grinding bin, of each static blade is fixed on the first main partition board, and the other end of each static blade is fixed on the barrel; at the moment, the inner area of the first main partition board intersected with the conical static blades is a blind plate, and the outer area is provided with a grid seam;
when the static blades are arranged in parallel with the axis of the cylinder body, one end of each static blade close to the grinding bin is fixed on the first main bin partition plate, and the other end of each static blade is fixed on the cylinder body; at the moment, the inner area of the first main partition board intersected with the static blades is a blind plate, and the outer area is provided with a grid seam.
10. The drying, grinding and powder selecting integrated ball milling system for the high-moisture material as claimed in claim 1, wherein a grinding lining plate is arranged on the inner wall of the barrel of the grinding bin, and a plurality of activation rings are arranged in the grinding bin.
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