EP4110527A1 - Nassmühle - Google Patents
NassmühleInfo
- Publication number
- EP4110527A1 EP4110527A1 EP21704165.6A EP21704165A EP4110527A1 EP 4110527 A1 EP4110527 A1 EP 4110527A1 EP 21704165 A EP21704165 A EP 21704165A EP 4110527 A1 EP4110527 A1 EP 4110527A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- grinding
- drum
- removal section
- section
- wet mill
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 238000001238 wet grinding Methods 0.000 title abstract description 4
- 238000000227 grinding Methods 0.000 claims abstract description 62
- 238000000034 method Methods 0.000 claims abstract description 18
- 239000000463 material Substances 0.000 claims description 28
- 239000012530 fluid Substances 0.000 claims description 6
- 230000007423 decrease Effects 0.000 claims description 3
- 238000013461 design Methods 0.000 abstract description 4
- 238000000926 separation method Methods 0.000 abstract description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 230000002349 favourable effect Effects 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 239000011435 rock Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 238000000265 homogenisation Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000007873 sieving Methods 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
- B02C17/04—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 unperforated container
- B02C17/06—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 unperforated container with several compartments
-
- 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
- B02C17/1835—Discharging devices combined with sorting or separating of material
-
- 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
- B02C17/1835—Discharging devices combined with sorting or separating of material
- B02C17/185—Discharging devices combined with sorting or separating of material with more than one separator
-
- 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
- B02C17/1835—Discharging devices combined with sorting or separating of material
- B02C17/1855—Discharging devices combined with sorting or separating of material with separator defining termination of crushing zone, e.g. screen denying egress of oversize material
-
- 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
-
- 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
- B02C17/20—Disintegrating members
Definitions
- the invention relates to a wet mill with a drum that can be rotated about its longitudinal axis and a grinding section that opens into a removal section, with a fill level-limiting separating element being provided between the removal section and two grinding sections adjoining the removal section on both sides in the direction of the longitudinal axis, which has a grinding stock passage which is radially spaced from the drum wall.
- ground material such as mineral rock or ores
- grinding media mills in particular ball mills
- the ground material is fed through a feed opening of the drum and processed into coarse or fine grain in its grinding section by the impact stress of the grinding media, after which the comminuted ground material is discharged in the removal section.
- wet mills offer particularly favorable process conditions, because the process fluid used in the process means that the flow of the ground material is more homogeneous, so that overall a more efficient comminution process can take place with little heat generation.
- the resulting regrind sludge also facilitates any separation and sieving processes downstream of the wet milling process by avoiding fine dust.
- a disadvantage of such wet mills or of grinding media mills in general is their comparatively low throughput due to the critical drum rotation speed, which is limited by the design and dependent on the drum inside diameter.
- the invention is therefore based on the object of designing a wet mill of the type described at the outset in such a way that, despite its compact design, higher throughput rates are possible while maintaining the same process quality, in particular enabling reliable separation of the grinding material flow from the painting bodies without the risk of the grinding material passage becoming blocked It consists of the grinding media and / or insufficiently comminuted grist.
- the invention solves the problem posed by the fact that the grinding stock passage comprises at least two rows of retaining rods offset from one another with gaps.
- the total throughput of the wet mill can be increased despite the dwell times of the ground material in the grinding sections required for sufficient processing quality, because the two grinding sections can each be connected to a separate loading opening to increase the supplied grinding material flow, whereas the fill level limiting the separating elements for a high-quality comminution process required fill level or a process volume sufficient for this in the respective grinding sections.
- the separating elements can permanently withstand the process pressures occurring during operation, it is recommended that the separating elements are curved convexly from the removal section into the grinding section for better load absorption of the corresponding pressure forces.
- the drum is connected non-rotatably to a gear that is in direct engagement with a pinion of a drive shaft of a drive motor, especially an electric motor.
- the gear is preferably attached to a drum end portion in such a way that it is enclosed by the gear on the circumferential side.
- the preferably rounded outer surface of the respective retaining rods reduces the friction to the grinding bodies or to the insufficiently comminuted ground material to the extent that jamming of the grinding bodies or the coarse ground material between the retaining rods can be largely avoided.
- the distance between the retaining rods in a row can roughly correspond to the diameter of a grinding body, the individual diameters of the retaining rods and the distance between the rows of rods being selected so that the effective gap dimension formed by the rows of rods offset by gaps is smaller than the grinding body diameter is.
- the two grinding sections for conveying the material to be ground into the removal section each have spiral conveyor channels running in opposite directions.
- This enables the formation of a homogeneous flow profile from the respective charging openings to the removal section with opposing main flow directions of the grinding material flow in the respective grinding sections in a structurally simple manner with a given drum rotation direction. light without having to provide an additional exhaust pump.
- wall lining elements can be provided which have preferably web-shaped flow bodies protruding radially inward with respect to the drum, so that one or more spiral conveyor passages are formed by lining up such wall lining elements.
- the separating elements are exposed to high process pressures as well as constant mechanical and chemical stress from a mixture of grinding media, any coarse grain and the process fluid, and are therefore subject to a certain amount of wear.
- the separating elements have to be maintained and, if necessary, replaced at specified intervals, so that not only long downtimes but also high material costs are occasionally caused.
- the separating elements form several annular bodies that are attached to one another in the longitudinal direction of the drum.
- the entire separating element it is not necessary for the entire separating element to be manufactured as a one-piece solid cast part, so that cost-intensive and time-consuming measures such as the production of a casting mold and the cooling of the cast part in a voltage-free state is omitted.
- the ring bodies which are screwed together in the simplest case, can thus also be replaced individually in a simple manner, so that the entire separating element does not have to be replaced in every case in the event of wear and tear and fatigue.
- the ring bodies can, for example, be prefabricated as standard components and kept in stock so that maintenance work can be carried out more quickly if necessary.
- the separating element can be achieved despite the low cost of material if the inner and outer diameter of the ring body decreases from the removal section.
- this results in a basically convex course of the separating body from the removal section to the respective Mahlgutab section, so that the pressure forces acting on the separating element from the grinding material section can be particularly gentle on the material via the individual annular bodies.
- the grinding stock passage is formed by the recesses of the ring bodies, the diameter of the grinding stock passage being able to correspond to the inner diameter of the smallest ring body facing the respective grinding stock section.
- FIG. 1 shows a schematic sectional illustration of a wet mill according to the invention in a side view
- Fig. 2 shows a section along the line II - II of FIGS. 1 and
- Fig. 3 shows a section along the line III - III of Fig. 2 through a Mahlgut notebook let on a larger scale.
- a wet mill according to the invention comprises a drum 1 rotierba re about its longitudinal axis A, which for this purpose is mounted on roller bearings 3, for example via bearing journals 2 on the drum front side.
- the drum 1 has a removal section 4 on which two grinding sections 5, 6 adjoin on both sides in the direction of the longitudinal axis A.
- a fill level-limiting separating element 7 is provided between the removal section 4 and the grinding sections 5, 6 and has a grinding material passage 8 which is radially spaced from the drum wall.
- the drum 1 is also rotatably connected to a gear 9, which can be driven by a pinion 10 of a drive motor, not shown.
- the grinding stock to be comminuted can be fed to the grinding sections 5, 6 together with the process fluid via loading openings 11, 12 on the drum front side.
- the ground material is comminuted in the grinding sections 5, 6 with the help of grinding bodies, the material flow being fed to the removal section 4 via the grinding material passages 8 and from there in turn removed from the removal section 4 via outlet openings 13 in the drum wall.
- the two Mahlab sections 5, 6 for conveying the grist in the removal section 4 each have opposite spiral conveyor channels 14 to each other.
- the separating elements 7 can be formed by a plurality of annular bodies 15 attached to one another in the longitudinal direction of the drum.
- the inner and outer diameter of the ring body 15 can decrease from the removal section 4 in the direction of the grinding material section 5 or 6, as can be seen in particular from FIG.
- the grist passage 8 can comprise at least two rows of retaining rods 16 offset from one another with gaps, as is indicated schematically in the sectional top view of a grist passage 8 according to FIG. 3.
- the effective gap dimension formed by the rows of bars offset with gaps is in any case smaller than the grinding body diameter.
- the restraint rods 16 can also be rotatably mounted with respect to their longitudinal axis.
- the retaining rods 16 can be set in rotation, in particular by applying pulses to the grinding bodies, so that any grinding bodies or rocks jammed between the retaining rods 16 can be released again in a reliable manner and returned to the grinding stock sections 5, 6.
Landscapes
- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Crushing And Grinding (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ATA50139/2020A AT523622B1 (de) | 2020-02-25 | 2020-02-25 | Nassmühle |
PCT/AT2021/060033 WO2021168491A1 (de) | 2020-02-25 | 2021-01-29 | Nassmühle |
Publications (1)
Publication Number | Publication Date |
---|---|
EP4110527A1 true EP4110527A1 (de) | 2023-01-04 |
Family
ID=74572569
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP21704165.6A Withdrawn EP4110527A1 (de) | 2020-02-25 | 2021-01-29 | Nassmühle |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP4110527A1 (de) |
CN (1) | CN115379901A (de) |
AT (1) | AT523622B1 (de) |
WO (1) | WO2021168491A1 (de) |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1037350A (en) * | 1965-05-04 | 1966-07-27 | Smidth & Co As F L | Method of making a slurry and compartment mill for carrying out the method |
US3537658A (en) * | 1968-12-10 | 1970-11-03 | Polysius Gmbh | Autogenous airswept mill |
DE2538431C2 (de) * | 1975-08-29 | 1983-04-07 | Fa. Christian Pfeiffer, 4720 Beckum | Auslaufwand für Rohrmühlen |
GB1478426A (en) * | 1975-11-20 | 1977-06-29 | Smidth & Co As F L | Tube mills for drying and grinding |
GB2038202B (en) * | 1978-12-29 | 1982-12-01 | Smidth & Co As F L | Dry grinding a granular material |
DE20312219U1 (de) * | 2003-08-07 | 2003-10-02 | Christian Pfeiffer Maschinenfabrik GmbH, 59269 Beckum | Rohrmühlen-Trennwände |
-
2020
- 2020-02-25 AT ATA50139/2020A patent/AT523622B1/de active
-
2021
- 2021-01-29 WO PCT/AT2021/060033 patent/WO2021168491A1/de unknown
- 2021-01-29 CN CN202180015070.2A patent/CN115379901A/zh active Pending
- 2021-01-29 EP EP21704165.6A patent/EP4110527A1/de not_active Withdrawn
Also Published As
Publication number | Publication date |
---|---|
CN115379901A (zh) | 2022-11-22 |
WO2021168491A1 (de) | 2021-09-02 |
AT523622B1 (de) | 2022-09-15 |
AT523622A1 (de) | 2021-09-15 |
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Legal Events
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18D | Application deemed to be withdrawn |
Effective date: 20231201 |