CN115418878A - Material screening system and screening method - Google Patents
Material screening system and screening method Download PDFInfo
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- CN115418878A CN115418878A CN202210989759.1A CN202210989759A CN115418878A CN 115418878 A CN115418878 A CN 115418878A CN 202210989759 A CN202210989759 A CN 202210989759A CN 115418878 A CN115418878 A CN 115418878A
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- 239000000463 material Substances 0.000 title claims abstract description 208
- 238000012216 screening Methods 0.000 title claims abstract description 99
- 238000000034 method Methods 0.000 title claims abstract description 92
- 238000000227 grinding Methods 0.000 claims abstract description 78
- 239000002002 slurry Substances 0.000 claims abstract description 15
- 241001233242 Lontra Species 0.000 claims description 25
- 239000012530 fluid Substances 0.000 claims description 7
- 238000007865 diluting Methods 0.000 claims description 6
- 238000003113 dilution method Methods 0.000 claims description 6
- 238000005516 engineering process Methods 0.000 claims description 6
- 230000000903 blocking effect Effects 0.000 claims description 3
- 238000011010 flushing procedure Methods 0.000 claims 1
- 230000000284 resting effect Effects 0.000 claims 1
- 239000000835 fiber Substances 0.000 description 9
- 238000004537 pulping Methods 0.000 description 8
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 7
- 235000017491 Bambusa tulda Nutrition 0.000 description 7
- 241001330002 Bambuseae Species 0.000 description 7
- 241000196324 Embryophyta Species 0.000 description 7
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 7
- 239000011425 bamboo Substances 0.000 description 7
- 238000005265 energy consumption Methods 0.000 description 5
- 229920002678 cellulose Polymers 0.000 description 4
- 239000001913 cellulose Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 229920005610 lignin Polymers 0.000 description 4
- 239000002023 wood Substances 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 238000004880 explosion Methods 0.000 description 3
- 229920002488 Hemicellulose Polymers 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000013590 bulk material Substances 0.000 description 2
- 238000010790 dilution Methods 0.000 description 2
- 239000012895 dilution Substances 0.000 description 2
- 238000003801 milling Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 238000007873 sieving Methods 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Images
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
- D21D5/00—Purification of the pulp suspension by mechanical means; Apparatus therefor
- D21D5/02—Straining or screening the pulp
- D21D5/04—Flat screens
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
- D21B1/00—Fibrous raw materials or their mechanical treatment
- D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
- D21B1/06—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by dry methods
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
- D21D5/00—Purification of the pulp suspension by mechanical means; Apparatus therefor
- D21D5/02—Straining or screening the pulp
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Paper (AREA)
Abstract
The disclosure discloses a material screening system and a screening method. The material screening system comprises a paddle tank, a screening device, a slurry tank, a driving device and a material receiving disc. The paddle pool is used for containing diluted materials which are high-concentration milled slurry. The screening device is located below the paddle pool and is provided with a screen plate, and the screen plate is provided with a plurality of meshes. The materials in the paddle pool flow to the screen plate of the screening device, part of the materials pass through the mesh openings, and the other part of the materials are intercepted on the screen plate. Partial materials of the pulp tank passing through the meshes flow to the pulp tank, and the pulp tank drains the partial materials to the next working procedure. The driving device drives the screen plate to rotate, and the screen plate drives the other part of the materials on the screen plate to move when rotating. The material receiving disc is located below the side of the end portion of the screening device, the other part of materials move along with the rotation of the screen plate, when the other part of materials move to the end portion, the other part of materials fall into the material receiving disc, and the materials in the material receiving disc enter two high-concentration grinding processes.
Description
Technical Field
The disclosure relates to the technical field of pulping processes, in particular to a material screening system and a material screening method in a pulping process.
Background
In the existing pulping process in the industry, high-concentration grinding is mainly used for stripping lignin and the like through grinding among materials, fibers can be well protected, but the energy consumption is high, and low-concentration grinding is used for stripping lignin and cutting fibers through cutting of grinding sheets and the materials, so that the buckling degree of the materials is improved, and the requirements of subsequent processes such as papermaking are met.
In the process of pulping the bamboo wood, due to the factors such as the size and the hardness of the bamboo wood, if only one high-concentration grinding is carried out, the subsequent process is directly carried out, adverse effects are caused on the screening of the material yield and the low-concentration grinding, the working pressure of coarse screening, fine screening and the like in the low-concentration grinding process is increased, and the conditions of screen blockage and the like are easy to occur. And two high-concentration mills are directly added, so that the power consumption is higher, and the proportion of fine fibers of the pulp is increased.
Disclosure of Invention
In order to solve the problems that in the prior art, the low-concentration grinding process is not beneficial to screening of the low-concentration grinding process when the material directly enters the low-concentration grinding process, and the energy consumption and the proportion of fine fibers can be increased by directly increasing two high-concentration grindings, the invention provides a material screening system and a material screening method.
The present disclosure provides a material screening system for pulp and paper making, comprising:
the slurry pool is used for containing diluted materials, and the materials are high-concentration milled slurry;
the screening device is positioned below the paddle tank and is provided with a screen plate, the screen plate is provided with a plurality of meshes, the material in the paddle tank flows to the screen plate of the screening device, part of the material passes through the meshes, and the other part of the material is intercepted on the screen plate;
the part of materials passing through the meshes flows to the size tank, and the size tank guides the part of materials to a low-concentration grinding process;
the driving device drives the screen plate to rotate, and the screen plate drives the other part of the materials on the screen plate to move when rotating;
and the material receiving disc is positioned below the side of the end part of the screening device, the other part of the material moves along with the rotation of the screen plate, when the other part of the material moves to the end part, the material falls into the material receiving disc, and the material in the material receiving disc enters two high-concentration grinding processes.
Optionally, the screening plant is circulation rotary type, the otter board encloses into circulating conveyer belt structure.
Optionally, the mesh plate comprises a mesh plate upper part, a mesh plate lower part and two end parts connecting the mesh plate upper part and the mesh plate lower part, wherein the two end parts are arc-shaped.
Optionally, the size tank is located between the upper part of the mesh plate and the lower part of the mesh plate.
Optionally, the screening device is cylindrical, and the screen plate is formed on the side surface of the screening device.
Optionally, the screening plant for the oar pond slope is placed, the otter board can wind screening plant's axial direction central line rotates, stops material on the otter board is in the otter board falls into when rotating in the take-up (stock) pan.
Optionally, the slurry tank is located below the entire screening device.
Optionally, the device further comprises a backflushing device, the backflushing device is arranged on one side of the screen plate, an outlet of the backflushing device faces the screen plate, and the fluid sprayed by the backflushing device flushes the material blocking the meshes.
Optionally, the mesh sheet comprises a multi-layer screen.
Optionally, the mesh openings of the mesh plate are circular or in a slit shape, and the size of the mesh openings is smaller than or equal to that of the mesh screen in the low-concentration grinding process.
The present disclosure further provides a material screening method for use in a pulping process in a papermaking process, comprising:
the high-consistency grinding process comprises the steps that materials enter high-consistency grinding equipment to be pulped to form coarse pulp;
a dilution process, wherein the material after high-concentration grinding is diluted, and the diluted concentration is less than or equal to 15%;
screening process, the material after diluting flows to high concentration mill screening plant from the oar pond, high concentration mill screening plant has the otter board, and partial material falls into the dressing trough through the mesh of otter board, by the dressing trough is in material drainage to low concentration mill technology, and another part material is intercepted on the otter board, the otter board is rotated by the drive arrangement drive, and another part material follows the rotation of otter board removes extremely during the otter board tip, falls in the take-up (stock) pan of otter board side below, material in the take-up (stock) pan will get into high concentration mill technology once more.
Optionally, the method further includes:
and performing a dilution process and a screening process on the materials after the second high-concentration grinding process.
The technical scheme provided by the embodiment of the disclosure can have the following beneficial effects:
the present disclosure provides a material screening system, which includes a paddle vat, a screening device, a slurry tank, a driving device and a receiving tray. The paddle pool is used for containing diluted materials which are high-concentration milled slurry. The screening device is positioned below the paddle pool and is provided with a screen plate, and the screen plate is provided with a plurality of meshes. The material in the paddle pool flows to a screen plate of the screening device, part of the material in the material passes through the mesh, and the other part of the material is intercepted on the screen plate. Partial materials of the pulp tank passing through the meshes flow to the pulp tank, and the pulp tank guides partial materials to the next procedure. The driving device drives the screen plate to rotate, and the screen plate drives the other part of the materials on the screen plate to move when rotating. The material receiving disc is located below the side of the end portion of the screening device, the other part of materials move along with the rotation of the screen plate, when the other part of materials move to the end portion, the other part of materials fall into the material receiving disc, and the materials in the material receiving disc enter two high-concentration grinding processes. The material screening system utilizes the screening device to separate large materials and small materials from the materials after the high-concentration grinding process, the large materials are intercepted on the screen plate and fall into the material receiving plate along with the rotation of the screen plate, the large materials subsequently enter the two high-concentration grinding processes, the small materials penetrate through the screen plate of the screening device and enter the slurry tank, and the small materials are introduced into the low-concentration grinding process through the slurry tank. And the small materials directly enter the low-concentration grinding process without secondary high-concentration grinding, so that the power consumption is reduced, and the increase of fine fibers is reduced.
The present disclosure provides a material screening system, comprising:
the high-consistency grinding process comprises the steps that materials enter high-consistency grinding equipment to be pulped to form coarse pulp;
a dilution process, wherein the material after high-concentration grinding is diluted, and the diluted concentration is less than or equal to 15%;
screening process, the material after diluting flows to high concentration mill screening plant from the oar pond, high concentration mill screening plant has the otter board, and partial material falls into the dressing trough through the mesh of otter board, by the dressing trough is in material drainage to low concentration mill technology, and another part material is intercepted on the otter board, the otter board is rotated by the drive arrangement drive, and another part material follows the rotation of otter board removes extremely during the otter board tip, falls in the take-up (stock) pan of otter board side below, material in the take-up (stock) pan will get into high concentration mill technology once more. The material screening method of the invention adds a dilution process and a screening process between the high-concentration grinding process and the low-concentration grinding process, thus separating large materials before entering the low-concentration grinding process, reducing the influence on the material yield and the influence on the low-concentration grinding operation pressure, and simultaneously reducing the problem of screen blockage of the low-concentration grinding net. In addition, the small materials directly enter the low-concentration grinding process without secondary high-concentration grinding, so that the power consumption is reduced, and the increase of fine fibers is also reduced.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure.
Figure 1 is a schematic diagram illustrating the construction of a material screening system according to an exemplary embodiment of the present disclosure.
Figure 2 is a schematic diagram illustrating the structure of a material screening system according to another exemplary embodiment of the present disclosure.
Fig. 3 is a schematic flow diagram illustrating a method of screening material according to an exemplary embodiment of the present disclosure.
Detailed Description
For further explanation of the principles and construction of the present disclosure, reference will now be made in detail to the preferred embodiments of the present disclosure, which are illustrated in the accompanying drawings.
As mentioned above, in the bamboo pulping process, the material needs to be subjected to a high concentration grinding process and a low concentration grinding process, and because the size of the material is not uniform after the high concentration grinding process, a plurality of large blocks and a plurality of small blocks exist at the same time, if the material directly enters low concentration grinding equipment after the high concentration grinding process, the large blocks are easy to block a screen, the operating pressure of the low concentration grinding equipment is increased, and the fineness of pulp is also influenced. If the materials after the high-concentration grinding process are completely subjected to the high-concentration grinding process again, the proportion of fine fibers can be increased, the fine fibers can influence the strength of paper, the energy consumption of the high-concentration grinding equipment is higher, and the energy consumption is increased and reduced by performing two high-concentration grinding processes on all the materials. Based on the above, the present inventors have recognized that there is a need for an apparatus or process that solves this problem, and have developed a material screening system and method for screening.
Specifically, referring to fig. 1, a schematic diagram of a material screening system according to an exemplary embodiment of the present disclosure is shown. The material screening system 100 comprises a paddle vat 11, a screening device 12, a vat 13, a drive device (not shown) and a receiving tray 14.
The paddle tank 11 is used for containing diluted materials. The material may be a highly concentrated milled slurry. The pulp can also be pulp made of bamboo. Generally, in the pulping process, before a high-concentration grinding process, bamboo wood also needs slicing, washing, soaking, steam explosion and other processes, and after steam explosion of the bamboo wood, lignin, cellulose and hemicellulose are primarily separated. After the primary separation, the high-concentration grinding process is carried out, and the devillicate and the stripping of the cellulose are further carried out. After the high-concentration grinding process, the material flows into the paddle tank 11 for dilution, or flows into the paddle tank 11 after dilution.
The bottom of the paddle vat 11 is provided with a valve member 16, which valve member 16, when opened, causes material to flow from the paddle vat 11 to the screening device 12.
The screening device 12 is located below the paddle tank 11, and the screening device 12 has a screen plate 121 (i.e., a screen), and the screen plate 121 is provided with a plurality of meshes. The mesh may be circular or slit, in other words, the mesh plate 121 may be a mesh screen or a slit screen. The mesh sizes are matched with the subsequent procedures such as the mesh size of a coarse screen of low-concentration grinding, namely the mesh sizes of the meshes are smaller than or equal to the mesh size of a mesh screen in the low-concentration grinding process. So, can avoid the bold material to enter into low dense grinding equipment as far as possible.
In another embodiment, the mesh sheet may comprise a multi-layer mesh.
In one embodiment, as shown in fig. 1, the sifting device 11 is of a circular type, and the screen plates 121 enclose a circular conveyor structure. The screen 121 is driven by a driving device to move cyclically in a direction indicated by a solid arrow a.
The mesh plate 121 includes a mesh plate upper portion 121a, a mesh plate lower portion 121b, and both end portions 121c connecting the mesh plate upper portion 121a and the mesh plate lower portion 121b, and both end portions 121c are arc-shaped. When the screen plate 121 moves in the direction of arrow a, the large materials on the screen plate 121 are dragged to move, and when the large materials are dragged to the end 121c of the screen plate 121, the materials fall into the receiving tray 14.
When the material in the slurry tank 11 flows to the mesh plate 121 of the screening device 12, part of the material (i.e. small material or small material fluid) falls into the slurry tank 13 through the mesh holes, and the other part of the material (i.e. large material) is intercepted on the mesh plate 121 due to the larger size. When the driving device drives the screen plate 121 to rotate, the large materials on the screen plate 121 are driven to move, and when the large materials are dragged to the end portion 121c of the screen plate 121, the materials fall into the material receiving tray 14. Therefore, the separation of large materials and small materials is realized.
A vat 13 is located between screen plate upper part 121a and screen plate lower part 121b, which directs the flow of small material to the next process, e.g. a low consistency milling process.
The receiving tray 14 is located below the end 121c of the screening device 12, and the lower side is on the path of the rotation direction of the upper part 121a of the mesh plate, so that the material on the mesh plate 121 is separated from the mesh plate and falls into the receiving tray 14 when the mesh plate 121 rotates downwards. The materials in the receiving tray 14 enter a second high-concentration grinding process through conveying equipment such as a conveying belt.
Further, in order to prevent the mesh on the mesh plate 121 from being blocked by the material, the material powder sieving system 100 is further provided with a backflushing device 15, the backflushing device 15 is arranged on one side of the mesh plate 121, an outlet of the backflushing device 15 faces the mesh plate 121, and the backflushing device 15 sprays water flow or air flow to the mesh plate 121 through the outlet to backflush the mesh plate 121 and prevent the material from blocking the mesh. Alternatively, the direction of fluid ejection from the backflushing device 15, as indicated by arrow B, is perpendicular to the direction of material flow.
Alternatively, as shown in FIG. 2, the present invention provides another embodiment of a material screening system 200, where material screening system 200 is similar in construction to material screening system 100 of the previous embodiment. The difference is mainly as follows: the screening device 22 is placed obliquely relative to the paddle pit 21. The screen device 22 is cylindrical, and a screen 221 is formed on a side surface of the screen device. The screen 221 is rotatable about the axial centre line L of the screening device 22. The vat 23 is located directly below the entire screening device 22. The outlet of the paddle vat 21 is arranged at the side of the bottom and the mesh panel 221 extends in a direction parallel to the outlet of the paddle vat 21. The material flows out from the outlet of the paddle vat 21 and falls on the screen plate 221, part of the material falls into the slurry tank 23 through the meshes of the screen plate 221, and the other part of the material is intercepted on the screen plate 221 due to the larger size and slowly slides to the receiving tray 23 under the action of gravity. The receiving tray 23 is located below the mesh plate 221 and is located in the sliding direction of the bulk material. When the driving device drives the screen plate 221 to rotate around the axial center line L (rotate in the direction indicated by the arrow C), the material on the screen plate 221 slides down rapidly and falls into the receiving tray 23.
In this embodiment, the material screening system 200 is further provided with a backflushing device 25, the backflushing device 25 being used to spray fluid to flush the screen plate 221 to avoid the screen plate 221 from being clogged by material. The fluid sprayed by the backflushing device 25 can be a gas flow or a water flow. The direction of the fluid ejection is perpendicular to the direction in which the bulk material slides toward the receiver 23, as indicated by the broken-line arrow D.
The two embodiments are only exemplary, and a related system that separates large materials and small materials from the high-consistency ground materials by a screening method, conveys the large materials to a high-consistency grinding process for two times of high-consistency grinding, and allows the small materials to enter the next process is within the protection scope of the present invention.
In addition, as shown in fig. 3, the present invention also provides a material sieving method for pulp making process in paper making process, comprising:
step S110, a high-consistency grinding process, wherein the material enters high-consistency grinding equipment for pulping to form coarse pulp;
step S120, in the dilution process, diluting the high-concentration ground material, wherein the diluted concentration is less than or equal to 15%;
and S130, in the screening process, the diluted material flows to a high-concentration grinding screening device from the paddle pool, the high-concentration grinding screening device is provided with a screen plate, part of the material falls into a pulp tank through the meshes of the screen plate, the pulp tank guides the material to the next process, the other part of the material is intercepted on the screen plate, the screen plate is driven to rotate by a driving device, the other part of the material falls into a material receiving disc below the side of the screen plate when moving to the end part of the screen plate along with the rotation of the screen plate, and the material in the material receiving disc enters the high-concentration grinding process again. Prior to step S110, the raw material such as bamboo is subjected to processes of slicing, washing, and steam explosion, and after these steps, lignin, cellulose, and hemicellulose are primarily separated. Then the mixture enters a high-concentration grinding machine for grinding, so that cellulose and the like are further divided and softened.
In step S120, the material after high concentration milling is diluted, so that the small material and the large material are rapidly separated in the subsequent screening process.
In step S130, the large material is separated by the screening device, and the large material enters the high-consistency mill again through the conveying device to perform the high-consistency grinding process. The separated small materials directly flow to the low-concentration grinding process through the paddle tank without passing through the high-concentration grinding process again, so that the increase of fine fibers is avoided.
Optionally, the material after the second high-concentration grinding process may be diluted and sieved again, and the sieved small material is fed into a low-concentration grinding apparatus. Optionally, if a large material is still intercepted by the screen plate after the second screening, whether the third high-concentration grinding process is carried out again or not can be determined according to actual conditions.
The material entering the paddle tank through the mesh plate can directly enter a low-concentration grinding process, and the material entering the low-concentration grinding process belongs to small materials, so that the operating pressure of low-concentration grinding equipment cannot be increased, and the energy consumption of the low-concentration grinding equipment can be reduced to a certain extent.
The above description is only a preferred embodiment of the disclosure, and is not intended to limit the scope of the disclosure, which is included in the present disclosure by the way of description and drawings of the present disclosure.
Claims (12)
1. A material screening system for pulp and paper making comprising:
the slurry pool is used for containing diluted materials, and the materials are high-concentration milled slurry;
the screening device is positioned below the paddle pool and is provided with a screen plate, the screen plate is provided with a plurality of meshes, the material in the paddle pool flows to the screen plate of the screening device, part of the material passes through the meshes, and the other part of the material is intercepted on the screen plate;
the part of materials passing through the meshes flow to the size box, and the size box guides the part of materials to a low-concentration grinding process;
the driving device drives the screen plate to rotate, and the screen plate drives the other part of the materials on the screen plate to move when rotating;
and the material receiving disc is positioned below the side of the end part of the screening device, the other part of the material moves along with the rotation of the screen plate, when the other part of the material moves to the end part, the material falls into the material receiving disc, and the material in the material receiving disc enters two high-concentration grinding processes.
2. The material screening system of claim 1, wherein said screen is of a circular rotary type, said screen panels enclosing a circular conveyor belt structure.
3. The material screening system of claim 2, wherein the screen comprises an upper portion, a lower portion and two ends connecting the upper portion and the lower portion, the two ends being arc-shaped.
4. A material screening system according to claim 2, wherein said vat is located between an upper portion of said screen and a lower portion of said screen.
5. A material screening system according to claim 1, wherein the screening device is cylindrical and the screen panels are formed on the sides of the screening device.
6. The material screening system of claim 5, wherein the screening device is positioned at an angle relative to the paddle well, the screen is rotatable about an axial centerline of the screening device, and material resting on the screen falls into the take-up pan as the screen rotates.
7. A material screening system according to claim 5, wherein the vat is located below the entire screening device.
8. A material screening system according to claim 1, further comprising a backflushing means, said backflushing means being disposed on one side of said screen plate, an outlet of said backflushing means facing said screen plate, fluid ejected through said backflushing means flushing out material blocking the mesh.
9. The material screening system of claim 1, wherein the mesh panel comprises a multi-layer screen.
10. The material screening system of claim 1, wherein the mesh openings of the mesh plate are circular or slit-shaped, and the size of the mesh openings is smaller than or equal to the mesh opening size of the mesh plate in the low-consistency grinding process.
11. A method of screening material for use in a pulp making process in a papermaking process, comprising:
the high-consistency grinding process comprises the steps that materials enter high-consistency grinding equipment to be pulped to form coarse pulp;
diluting, namely diluting the material subjected to high-concentration grinding, wherein the diluted concentration is less than or equal to 15%;
screening process, the material after diluting flows to high concentration mill screening plant from the oar pond, high concentration mill screening plant has the otter board, and partial material falls into the dressing trough through the mesh of otter board, by the dressing trough is in material drainage to low concentration mill technology, and another part material is intercepted on the otter board, the otter board is rotated by the drive arrangement drive, and another part material follows the rotation of otter board removes extremely during the otter board tip, falls in the take-up (stock) pan of otter board side below, material in the take-up (stock) pan will get into high concentration mill technology once more.
12. A material screening method as recited in claim 11, further comprising:
and performing a dilution process and a screening process on the materials after the second high-concentration grinding process.
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| CN202210989759.1A CN115418878A (en) | 2022-08-17 | 2022-08-17 | Material screening system and screening method |
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| CN202210989759.1A CN115418878A (en) | 2022-08-17 | 2022-08-17 | Material screening system and screening method |
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