CN112371481A - Efficient screening device and screening method for fine materials - Google Patents
Efficient screening device and screening method for fine materials Download PDFInfo
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- CN112371481A CN112371481A CN202011305983.1A CN202011305983A CN112371481A CN 112371481 A CN112371481 A CN 112371481A CN 202011305983 A CN202011305983 A CN 202011305983A CN 112371481 A CN112371481 A CN 112371481A
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- 238000012216 screening Methods 0.000 title claims abstract description 64
- 239000000463 material Substances 0.000 title claims abstract description 25
- 238000000034 method Methods 0.000 title claims abstract description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 16
- 230000000149 penetrating effect Effects 0.000 claims description 5
- 238000001035 drying Methods 0.000 claims description 4
- 238000003466 welding Methods 0.000 claims description 2
- 208000027418 Wounds and injury Diseases 0.000 abstract description 3
- 238000001816 cooling Methods 0.000 abstract description 3
- 230000006378 damage Effects 0.000 abstract description 3
- 208000014674 injury Diseases 0.000 abstract description 3
- 239000000203 mixture Substances 0.000 abstract description 2
- 238000007873 sieving Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 239000010419 fine particle Substances 0.000 description 3
- 241001391944 Commicarpus scandens Species 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 238000002386 leaching Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 125000004432 carbon atom Chemical group C* 0.000 description 1
- 238000005256 carbonitriding Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 125000004433 nitrogen atom Chemical group N* 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
- B07B1/28—Moving screens not otherwise provided for, e.g. swinging, reciprocating, rocking, tilting or wobbling screens
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
- B07B1/42—Drive mechanisms, regulating or controlling devices, or balancing devices, specially adapted for screens
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
- B07B1/46—Constructional details of screens in general; Cleaning or heating of screens
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
- B07B1/46—Constructional details of screens in general; Cleaning or heating of screens
- B07B1/4609—Constructional details of screens in general; Cleaning or heating of screens constructional details of screening surfaces or meshes
Abstract
The invention belongs to the technical field of processing devices, and particularly relates to a fine material efficient screening device and a screening method thereof, which comprise a shell, a control panel, a variable frequency controller, a composition board, a fixing pile and a transverse plate, wherein the front side wall of the shell is fixedly connected with the control panel through screws; the clear water consumption of single screening reduces by a wide margin, effectively practices thrift the water source, by original both hands last soak in the basin screening become manual control can, intensity of labour reduces, eliminates the influence of human factor to the screening result, has solved the injury scheduling problem of arm overstrain, water-cooling to both hands winter.
Description
Technical Field
The invention relates to the technical field of processing devices, in particular to a fine material efficient screening device and a screening method thereof.
Background
Cyanidation refers to the process of simultaneously penetrating carbon atoms and nitrogen atoms into steel, and is also called cyanidation treatment, also called carbonitriding.
In the cyanidation process, the standard-reaching grinding fineness is a key factor for ensuring the stability of leaching indexes, and the fluctuation and the leaching indexes are basically in positive correlation. When the grinding fineness (400 meshes) reaches more than 92 percent, the specific gravity of fine particles and micro-fine particles is high, the conventional manual wet screening is difficult, and the specific problem is as follows.
Caking exists in a screened sample, and the caking is not easy to loosen in the screening process, so that the screening difficulty is increased; if the manual or brush is used for assisting, part of particles are easy to passively pass through the screen, so that the deviation between the screening result and the true value is large, and due to the influence of factors such as personal operation level, responsibility center and the like, when the same sample is manually screened, the screening data inevitably has human errors, and the efficiency is low; in addition, the water consumption of a single sample is about 15L by manual screening by using clean water, so that the environmental protection requirements of energy conservation and emission reduction are difficult to combine.
Disclosure of Invention
The invention aims to provide a fine material efficient screening device and a screening method thereof, aiming at solving the problems that the existing screening samples proposed in the background technology have caking, are not easy to loosen in the screening process, and the screening difficulty is increased; if the manual or brush is used for assisting, part of particles are easy to passively pass through the screen, so that the deviation between the screening result and the true value is large, and due to the influence of factors such as personal operation level, responsibility center and the like, when the same sample is manually screened, the screening data inevitably has human errors, and the efficiency is low; in addition, clear water is used for manual screening, the water consumption of a single screened sample is about 15L, and the problem of environmental protection requirements on energy conservation and emission reduction is difficult to compound.
In order to achieve the purpose, the invention provides the following technical scheme: a fine particle material efficient screening device comprises a shell, a control panel, a variable frequency controller, a combined plate, a fixing pile and a transverse plate, wherein the front side wall of the shell is fixedly connected with the control panel through screws, the bottom of an inner cavity of the shell is fixedly connected with the variable frequency controller through screws, the top of the shell is fixedly connected with the combined plate through screws, the fixing pile is welded at the top of the combined plate, a bottom groove is formed in the bottom of the combined plate, a cover barrel is sleeved at the top of the bottom groove, the top of the cover barrel is in contact with the transverse plate, a main opening button and an auxiliary opening button are inlaid in the front side wall of the shell, a display screen and buttons are inlaid in the front side wall of the control panel, an ultrasonic generator, a vibrator and the control panel are electrically connected with the variable frequency controller, the top of the ultrasonic generator is sleeved with the bottom of the bottom groove, and a binding band is sleeved, the utility model discloses a vibrating screen, including bandage, fixing pile, diaphragm, the preceding lateral wall of bandage passes through screw fixed connection the electromagnetic shaker, the lateral wall threaded connection of fixing pile has the gim peg, the circumference inner wall of fixing pile is pegged graft and is had the connecting rod, the circumference outer wall of connecting rod cup joints the diaphragm, the circumference outer wall top threaded connection of connecting rod has the tie peg, the inboard welding of diaphragm has the lantern ring, the circumference inner wall of the lantern ring has cup jointed the gasbag ring, the circumference inner wall of the lantern ring has cup jointed the standard sieve.
Preferably, the bottom of the shell is fixedly connected with a bottom plate through screws, and a base is bonded to the bottom of the bottom plate.
Preferably, a transverse plate hole is formed in the top of the transverse plate, and the inner diameter of the transverse plate hole is matched with the outer diameter of the connecting rod.
Preferably, the outer wall of gasbag ring bonds there is the air cock, the inside grafting of air cock has the air cock stopper.
Preferably, the circumference outer wall of the standard sieve is larger than that of the lantern ring, and dense sieve pores are uniformly formed in the outer part of the standard sieve.
Preferably, the circumferential outer walls of the fixing bolt and the connecting bolt are sleeved with rubber sleeves.
A screening method of a fine-grained material high-efficiency screening device comprises the following steps:
s1: adding 40-50 g of a sample to be measured into the standard sieve, placing the standard sieve into the lantern ring, penetrating the transverse plate hole in the transverse plate by using the connecting rod, enabling the standard sieve to be arranged in the cover barrel, and adjusting replenishing water flow;
s2: the control panel connected with the variable frequency controller is used for simultaneously starting the vibrator and the ultrasonic generator to generate mechanical vibration and ultrasonic waves, and the intensity of the ultrasonic generator is adjusted to 10-20% of the action of the ultrasonic waves for 15-30 s and then the ultrasonic generator is closed;
s3: closing the vibrator after the mechanical vibration generated by the vibrator reaches 2-4 min, and finishing the screening process;
s4: and taking the standard sieve, transferring oversize products, drying, and finally calculating the fineness.
Compared with the prior art, the invention has the beneficial effects that: according to the efficient screening device and the screening method for the fine materials, aiming at the problems existing in the conventional manual wet screening, the mechanical vibration and the ultrasonic wave simultaneously participate in the screening process, so that an active effect is generated on the screening of the fine materials, the fine materials are easy to break up and agglomerate, the qualified materials are easy to screen, the stability and the reproducibility of fineness data are improved, the screening time is shortened, and the operation efficiency is obviously improved; the clear water consumption of single screening reduces by a wide margin, effectively practices thrift the water source, by original both hands last soak in the basin screening become manual control can, intensity of labour reduces, eliminates the influence of human factor to the screening result, has solved the injury scheduling problem of arm overstrain, water-cooling to both hands winter.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is an internal view of the overall structure of the present invention;
FIG. 3 is a schematic diagram of the overall structure of the present invention, shown disassembled;
fig. 4 is a schematic top view of the screen frame of the present invention.
In the figure: 100 casing, 101 main opening button, 102 auxiliary opening button, 110 bottom plate, 120 base, 200 control panel, 210 display screen, 220 button, 300 frequency conversion controller, 310 ultrasonic generator, 400 composition plate, 410 cover barrel, 420 binding band, 430 vibrator, 500 fixing pile, 510 fixing bolt, 520 connecting rod, 530 connecting bolt, 600 transverse plate, 601 transverse plate hole, 610 lantern ring, 620 gasbag ring, 630 standard sieve.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a fine material efficient screening device and a screening method thereof, which are convenient for reducing labor intensity, increasing efficiency and saving water resources by the combined application of accessories, please refer to fig. 1, fig. 2, fig. 3 and fig. 4, and comprise a shell 100, a control plate 200, a variable frequency controller 300, a combination plate 400, a fixing pile 500 and a transverse plate 600;
referring to fig. 1 again, the front sidewall of the casing 100 has a main opening button 101 and an auxiliary opening button 102, and specifically, the front sidewall of the casing 100 is embedded with the main opening button 101 and the auxiliary opening button 102;
referring to fig. 2 again, the control board 200 is fixedly mounted to the housing 100, specifically, the front side wall of the housing 100 is fixedly connected to the control board 200 through screws, the front side wall of the control board 200 is embedded with the display screen 210 and the button 220, and the variable frequency controller 300 is electrically connected to the ultrasonic generator 310, the vibrator 430 and the control board 200;
referring to fig. 2 again, the frequency conversion controller 300 is fixedly connected to the housing 100, specifically, the bottom of the inner cavity of the housing 100 is fixedly connected to the frequency conversion controller 300 through screws, and the top of the ultrasonic generator 310 is sleeved with the bottom of the bottom groove;
referring to fig. 3 and 4 again, the combination board 400 is connected to the housing 100, specifically, the top of the housing 100 is fixedly connected to the combination board 400 through screws, the bottom of the combination board 400 is provided with a bottom groove, the top of the bottom groove is sleeved with the cover barrel 410, the circumferential outer wall of the cover barrel 410 is sleeved with the binding band 420, and the front side wall of the binding band 420 is fixedly connected to the vibrator 430 through screws;
referring to fig. 3 and 4 again, the fixing pile 500 is connected to the combination plate 400, specifically, the fixing pile 500 is welded to the top of the combination plate 400, the side wall of the fixing pile 500 is connected to the fixing bolt 510 through a screw thread, and the connecting rod 520 is inserted into the circumferential inner wall of the fixing pile 500;
referring to fig. 3 and 4 again, the transverse plate 600 is connected with the cover barrel 410, specifically, the top of the cover barrel 410 contacts the transverse plate 600, the circumferential outer wall of the connecting rod 520 is sleeved with the transverse plate 600, the top of the circumferential outer wall of the connecting rod 520 is in threaded connection with the connecting bolt 530, the inner side of the transverse plate 600 is welded with the lantern ring 610, the circumferential inner wall of the lantern ring 610 is sleeved with the air bag ring 620, and the circumferential inner wall of the lantern ring 610 is sleeved with the standard sieve 630;
a screening method of a fine-grained material high-efficiency screening device comprises the following steps:
s1: adding 40 g-50 g of a sample to be measured into a standard sieve 630, placing the standard sieve 630 into a lantern ring 610, penetrating a transverse plate hole 601 on a transverse plate 600 by using a connecting rod 520, enabling the standard sieve 630 to be arranged inside the cover barrel 410, and adjusting the replenishing water flow;
s2: the control board 200 connected with the variable frequency controller 300 is utilized to simultaneously start the vibrator 430 and the ultrasonic generator 310 to generate mechanical vibration and ultrasonic waves, and the intensity of the ultrasonic generator 310 is adjusted to 10-20% of the action of the ultrasonic waves for 15-30 s and then is closed;
s3: closing the vibrator 430 after the mechanical vibration reaches 2-4 min to complete the sieving process;
s4: taking a standard sieve 630, transferring oversize products, drying, and finally calculating the fineness.
Examples
A screening method of a fine-grained material high-efficiency screening device comprises the following steps:
s1: adding 50g of a sample to be tested into a standard sieve 630, placing the standard sieve 630 into a lantern ring 610, penetrating a transverse plate hole 601 on a transverse plate 600 by using a connecting rod 520, enabling the standard sieve 630 to be arranged inside the cover barrel 410, and adjusting the replenishing water flow;
s2: simultaneously starting the vibrator 430 and the ultrasonic generator 310 by using the control board 200 connected with the variable frequency controller 300 to generate mechanical vibration and ultrasonic waves, and closing the ultrasonic generator 310 after the intensity of the ultrasonic generator 310 is adjusted to 15% of the action of the ultrasonic waves reaches 25 s;
s3: closing the vibrator 430 after the mechanical vibration reaches 3min to complete the sieving process;
s4: taking a standard sieve 630, transferring oversize products, drying, and finally calculating the fineness.
When the device is used specifically, a sample to be tested is firstly added into a standard sieve 630 and is placed into a lantern ring 610, a connecting rod 520 penetrates through a transverse plate hole 601 in a transverse plate 600, the standard sieve 630 is placed inside a cover bucket 410, the replenishing water flow is regulated, then a control panel 200 connected with a variable frequency controller 300 is used for simultaneously starting a vibrator 430 and an ultrasonic generator 310 to generate mechanical vibration and ultrasonic waves, the ultrasonic generator 310 is closed after the intensity of the ultrasonic generator 310 is adjusted to be 20% of the action of the ultrasonic waves reaches 30s, the vibrator 430 is closed after the mechanical vibration reaches 2 min-4 min, the sieving process is completed, the standard sieve 630 is taken, the oversize is transferred and then dried, and finally the fineness is calculated.
Referring to fig. 1 again, in order to facilitate the bottom support of the housing 100, specifically, the bottom of the housing 100 is fixedly connected to a bottom plate 110 by screws, and a base 120 is adhered to the bottom of the bottom plate 110.
Referring to fig. 4 again, in order to facilitate the matching and fixing of the transverse plate 600, specifically, a transverse plate hole 601 is formed at the top of the transverse plate 600, and the inner diameter of the transverse plate hole 601 is matched with the outer diameter of the connecting rod 520.
Referring to fig. 4 again, in order to enable the air bag ring 620 to perform inflation and deflation, specifically, an air nozzle is bonded to the outer wall of the air bag ring 620, and an air nozzle plug is inserted into the air nozzle.
Referring to fig. 4 again, in order to achieve the purpose of sieving, specifically, the outer circumferential wall of the standard sieve 630 is larger than the outer circumferential wall of the collar 610, and dense sieve holes are uniformly formed outside the standard sieve 630.
Referring to fig. 3 again, in order to prevent slipping when the fixing bolt 510 and the connecting bolt 530 are used, specifically, a rubber sleeve is sleeved on the circumferential outer wall of the fixing bolt 510 and the connecting bolt 530.
The synthesis of the above: according to the efficient screening device and the screening method for the fine materials, aiming at the problems existing in the conventional manual wet screening, the mechanical vibration and the ultrasonic wave simultaneously participate in the screening process, so that an active effect is generated on the screening of the fine materials, the fine materials are easy to break up and agglomerate, the qualified materials are easy to screen, the stability and the reproducibility of fineness data are improved, the screening time is shortened, and the operation efficiency is obviously improved; the clear water consumption of single screening reduces by a wide margin, effectively practices thrift the water source, by original both hands last soak in the basin screening become manual control can, intensity of labour reduces, eliminates the influence of human factor to the screening result, has solved the injury scheduling problem of arm overstrain, water-cooling to both hands winter.
While the invention has been described above with reference to an embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In particular, the various features of the embodiments disclosed herein may be used in any combination, provided that there is no structural conflict, and the combinations are not exhaustively described in this specification merely for the sake of brevity and conservation of resources. Therefore, it is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.
Claims (7)
1. The utility model provides a high-efficient screening plant of fine material which characterized in that: the multifunctional combined plate comprises a shell (100), a control plate (200), a variable frequency controller (300), a combined plate (400), a fixed pile (500) and a transverse plate (600), wherein the front side wall of the shell (100) is fixedly connected with the control plate (200) through screws, the bottom of an inner cavity of the shell (100) is fixedly connected with the variable frequency controller (300) through screws, the top of the shell (100) is fixedly connected with the combined plate (400) through screws, the top of the combined plate (400) is welded with the fixed pile (500), the bottom of the combined plate (400) is provided with a bottom groove, the top of the bottom groove is sleeved with a cover barrel (410), the top of the cover barrel (410) is contacted with the transverse plate (600), the front side wall of the shell (100) is inlaid with a main opening button (101) and an auxiliary opening button (102), the front side wall of the control plate (200) is inlaid with a display screen (210) and, the variable frequency controller (300) is electrically connected with an ultrasonic generator (310), a vibrator (430) and the control panel (200), the top of the ultrasonic generator (310) is sleeved with the bottom of the bottom groove, the circumferential outer wall of the cover barrel (410) is sleeved with a bandage (420), the front side wall of the binding band (420) is fixedly connected with the vibrator (430) through screws, the side wall of the fixed pile (500) is in threaded connection with a fixed bolt (510), the circumferential inner wall of the fixed pile (500) is inserted with a connecting rod (520), the outer wall of the circumference of the connecting rod (520) is sleeved with the transverse plate (600), the top of the outer wall of the circumference of the connecting rod (520) is in threaded connection with a connecting bolt (530), the inboard welding of diaphragm (600) has lantern ring (610), gasbag ring (620) have been cup jointed to the circumference inner wall of lantern ring (610), the circumference inner wall of lantern ring (610) has cup jointed standard sieve (630).
2. A high efficiency fine material screening apparatus as claimed in claim 1, wherein: the bottom of the shell (100) is fixedly connected with a bottom plate (110) through screws, and a base (120) is bonded to the bottom of the bottom plate (110).
3. A high efficiency fine material screening apparatus as claimed in claim 2, wherein: the top of diaphragm (600) has been seted up diaphragm hole (601), the internal diameter in diaphragm hole (601) with the external diameter phase-match of connecting rod (520).
4. A high efficiency fine material screening apparatus as claimed in claim 3, wherein: the outer wall bonding of gasbag ring (620) has the air cock, the inside grafting of air cock has the air cock stopper.
5. A fine material high efficiency screening apparatus according to claim 4, wherein: the circumference outer wall of standard sieve (630) is greater than the circumference outer wall of lantern ring (610), intensive sieve mesh has evenly been seted up to the outside of standard sieve (630).
6. A fine material high efficiency screening apparatus according to claim 5, wherein: rubber sleeves are sleeved on the circumferential outer walls of the fixing bolts (510) and the connecting bolts (530).
7. A screening method of a high efficiency fine grained matter screening device according to any one of claims 1-6, characterized by: the screening method of the high-efficiency fine-grained material screening device comprises the following steps:
s1: adding 40 g-50 g of a sample to be measured into the standard sieve (630), putting the standard sieve into the sleeve ring (610), penetrating the transverse plate hole (601) on the transverse plate (600) by using the connecting rod (520), enabling the standard sieve (630) to be arranged in the cover barrel (410), and adjusting the replenishing water flow;
s2: the vibrator (430) and the ultrasonic generator (310) are simultaneously started by utilizing the control board (200) connected with the variable frequency controller (300) to generate mechanical vibration and ultrasonic waves, and the intensity of the ultrasonic generator (310) is adjusted to 10-20% of the action of the ultrasonic waves for 15-30 s and then is closed;
s3: closing the vibrator (430) after the mechanical vibration reaches 2-4 min, and finishing the screening process;
s4: and taking the standard sieve (630), transferring oversize products, drying, and finally calculating the fineness.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011305983.1A CN112371481A (en) | 2020-11-20 | 2020-11-20 | Efficient screening device and screening method for fine materials |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011305983.1A CN112371481A (en) | 2020-11-20 | 2020-11-20 | Efficient screening device and screening method for fine materials |
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| Publication Number | Publication Date |
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| CN112371481A true CN112371481A (en) | 2021-02-19 |
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| CN202011305983.1A Pending CN112371481A (en) | 2020-11-20 | 2020-11-20 | Efficient screening device and screening method for fine materials |
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Application publication date: 20210219 |