CA1054587A - Partition for tumbling mills or the like - Google Patents
Partition for tumbling mills or the likeInfo
- Publication number
- CA1054587A CA1054587A CA219988A CA219988A CA1054587A CA 1054587 A CA1054587 A CA 1054587A CA 219988 A CA219988 A CA 219988A CA 219988 A CA219988 A CA 219988A CA 1054587 A CA1054587 A CA 1054587A
- Authority
- CA
- Canada
- Prior art keywords
- chamber
- drum
- zone
- annular
- charge
- 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.)
- Expired
Links
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
Landscapes
- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Crushing And Grinding (AREA)
- Crushing And Pulverization Processes (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A tumbling mill or like apparatus having a generally horizontally mounted rotary drum along which a charge is caused to flow from a first zone of the drum to a second zone includes an intermediate zone at which an additional material is introduced into the drum to be added to the charge. Deflector means in the intermediate zone ensure that the charge and additional material proceed to the second zone, the deflector means providing a trap to prevent material from passing back to the first zone. The additional material may be a gas or vapour, or a solid or liquid material or slurry.
A tumbling mill or like apparatus having a generally horizontally mounted rotary drum along which a charge is caused to flow from a first zone of the drum to a second zone includes an intermediate zone at which an additional material is introduced into the drum to be added to the charge. Deflector means in the intermediate zone ensure that the charge and additional material proceed to the second zone, the deflector means providing a trap to prevent material from passing back to the first zone. The additional material may be a gas or vapour, or a solid or liquid material or slurry.
Description
~0545~7 This invention relates to tumbling or grinding mills, . rotary kilns, dryers, and the like, and more generally to apparatus -of the kind having a horizontally mounted or slightly inclined rotary drum along which a charge is caused to flow. The drum is usually of cylindrical or conical shape, Such apparatus is exten-sively used in the mineral and metallurgical process industries.
In the majority of cases, the drums are fed and discharged continu-ously and openings are provided at the axial extremities of the drums for the ingress and egress of solids and/or fluids such as water, hot gas, and the like.
In some cases it may sometimes be desired to carry on two or more stages of the process in sequence within the same drum, One example of such a requiremant is a two-stage grinding process in which coarse grinding is performed, using large grinding media, in the upstream ~nd of a ball mill and fine grinding, using smaller --grinding media, is performed in the downstream end of the mill. ~;
, . . .
A diaphragm partition is usually used to keep the two sizes of media separate, the diaphragm partition being provided with slots through which the charge can pass.
.
Furthermore, it ic usually advantageous to ensure that the charge will flow through the diaphragm in one direction only, i.e, downstream. This is usually accomplished by constructing a partition with two diaphragms spaced several inches apart, the up-stream diaphragm being provided with slots for passage of the , .
charge and the downstream diaphragm having a central opening of comparable size to the main feed and discharge openings of the drum. The space between the diaphragms is divided into a number of compartments by means of radial vanes or lifters, whose function `~ is to elevate material as the drum rotates, the lifted material .,' -1-.. . .
: .
,j. . .
I: 1054587 sliding down the lifter radially towards the centre of the mill shell. A conical deflector is provided at the axial centre of the diaphragm to deflect the material from the lifters to the outer, downstreaM side of the partition. In other cases it is sometimes advantageous to discharge process material or charge from a rota-ting drum through ports around the periphery of the drum rather than through an end discharge opening. In such a case, when grind-ing media have to be retained within the shell, it is usual to ; provide a single slotted grate diaphragm, without lifters, through which the material can flow and hence through the peripheral ports.
It is an object of the present invention to provide an apparatus with provision for introducing solids or fluids into the ~ rotary drum, at an intermediate point between the ends of the drum, without accidental discharge of materials already insidè
. the drum, :
According to the invention there is provided in an appara-tus comprising a horizontally mounted rotary drum along which a charge is caused to flow from an upstream zone of the drum to a downstream zone which is axially spaced from the upstream zone, means defining an intermediate zone at which an additional material may be introduced into the charge, said means comprising a plura-lity of axially spaced transverse drum partitions defining first, -. second and third lifting chambers, with deflector means for deflec-ting the charge and additional material through the chambers to-: wards the downstream zone, the deflector means providing a trap . for preventing the passage of material back to the upstream zone~
- The additional material may be a gas or vapor, or a solid or liquid material or slurry, In order that the invention may be readily understood,
In the majority of cases, the drums are fed and discharged continu-ously and openings are provided at the axial extremities of the drums for the ingress and egress of solids and/or fluids such as water, hot gas, and the like.
In some cases it may sometimes be desired to carry on two or more stages of the process in sequence within the same drum, One example of such a requiremant is a two-stage grinding process in which coarse grinding is performed, using large grinding media, in the upstream ~nd of a ball mill and fine grinding, using smaller --grinding media, is performed in the downstream end of the mill. ~;
, . . .
A diaphragm partition is usually used to keep the two sizes of media separate, the diaphragm partition being provided with slots through which the charge can pass.
.
Furthermore, it ic usually advantageous to ensure that the charge will flow through the diaphragm in one direction only, i.e, downstream. This is usually accomplished by constructing a partition with two diaphragms spaced several inches apart, the up-stream diaphragm being provided with slots for passage of the , .
charge and the downstream diaphragm having a central opening of comparable size to the main feed and discharge openings of the drum. The space between the diaphragms is divided into a number of compartments by means of radial vanes or lifters, whose function `~ is to elevate material as the drum rotates, the lifted material .,' -1-.. . .
: .
,j. . .
I: 1054587 sliding down the lifter radially towards the centre of the mill shell. A conical deflector is provided at the axial centre of the diaphragm to deflect the material from the lifters to the outer, downstreaM side of the partition. In other cases it is sometimes advantageous to discharge process material or charge from a rota-ting drum through ports around the periphery of the drum rather than through an end discharge opening. In such a case, when grind-ing media have to be retained within the shell, it is usual to ; provide a single slotted grate diaphragm, without lifters, through which the material can flow and hence through the peripheral ports.
It is an object of the present invention to provide an apparatus with provision for introducing solids or fluids into the ~ rotary drum, at an intermediate point between the ends of the drum, without accidental discharge of materials already insidè
. the drum, :
According to the invention there is provided in an appara-tus comprising a horizontally mounted rotary drum along which a charge is caused to flow from an upstream zone of the drum to a downstream zone which is axially spaced from the upstream zone, means defining an intermediate zone at which an additional material may be introduced into the charge, said means comprising a plura-lity of axially spaced transverse drum partitions defining first, -. second and third lifting chambers, with deflector means for deflec-ting the charge and additional material through the chambers to-: wards the downstream zone, the deflector means providing a trap . for preventing the passage of material back to the upstream zone~
- The additional material may be a gas or vapor, or a solid or liquid material or slurry, In order that the invention may be readily understood,
-2-~ ~ lOS4587 two embodiments thereof will now be described, by way of example ; with reference to the accompanying drawings, in which:
Figure 1 is a side elevation of a tumbling mill having means for introducing a gas or vapour at an intermediate zone of the mill;
Figure 2 i3 a cross-sectional view of the mill, the section being taken through the intermediate zone, and certain parts being broken away to show details of said zone;
Figure 3 is a longitudinal sectional view showing details of the intermediate zone;
Figure 4 is a longitudinal sectional view corresponding to Figure 3 of a modified apparatus having means for introducing . solids or slurries at the intermediate zone, and :::
. Figure 5 is a cross-sectional view corresponding to : Figure 2 of said modified apparatus.
Referring to Figure 1, the tumbling mill comprises a horizontally mounted rotary drum 10 of cylindrical shape, the drum . being mounted on bearings 11, 12 and being rotated about its horizontal axis by a drive motor 13 through a pinion 14 and spur ri 20 gear 15. The drum has an inlet opening and a discharge opening ~ at its opposite ends. The charge, or material to be processed, is ~:
`~ fed into an upstream zone 16 of the drum by way of a charging chute ` 17, and processed material is discharged from a downstream zone 18 of the drum by way of a discharge chute 19, a conical deflector - 20 being positioned adjacent to the discharge opening and combined i with grates and lifters for discharging material into the discharge `~ chute in the known manner.
Positioned between the upstream and downstream zones 16, 18 is an intermediate zone 22 into which an additional material,
Figure 1 is a side elevation of a tumbling mill having means for introducing a gas or vapour at an intermediate zone of the mill;
Figure 2 i3 a cross-sectional view of the mill, the section being taken through the intermediate zone, and certain parts being broken away to show details of said zone;
Figure 3 is a longitudinal sectional view showing details of the intermediate zone;
Figure 4 is a longitudinal sectional view corresponding to Figure 3 of a modified apparatus having means for introducing . solids or slurries at the intermediate zone, and :::
. Figure 5 is a cross-sectional view corresponding to : Figure 2 of said modified apparatus.
Referring to Figure 1, the tumbling mill comprises a horizontally mounted rotary drum 10 of cylindrical shape, the drum . being mounted on bearings 11, 12 and being rotated about its horizontal axis by a drive motor 13 through a pinion 14 and spur ri 20 gear 15. The drum has an inlet opening and a discharge opening ~ at its opposite ends. The charge, or material to be processed, is ~:
`~ fed into an upstream zone 16 of the drum by way of a charging chute ` 17, and processed material is discharged from a downstream zone 18 of the drum by way of a discharge chute 19, a conical deflector - 20 being positioned adjacent to the discharge opening and combined i with grates and lifters for discharging material into the discharge `~ chute in the known manner.
Positioned between the upstream and downstream zones 16, 18 is an intermediate zone 22 into which an additional material,
-3-., ; . : . . , . :
. ~ . ~ . . .
in this case a gas, may be introduced to be added to the charge.
The details of the intermediate zone are shown in Figures 2 and 3. Essentially, this zone is formed by a plurality of, in this case four, axially spaced, transverse drum partitions 23,24,25, 26, which define a plurality of chambers, in this case first, second and third lifting chambers 27,28,29. The first partition 23 is formed by a slotted grid which defines an inlet to the first chamber 27. Ground material of a suitable size, or slurry or the like, can pass from the upstream drum zone 16 through the grid into the first chamber 27. The central portion of the partition 23 is connected to, or formed integrally with, a conical deflector 30 which extends axially for substantially the full axial length of the first chamber 27. Radial lifters 31 extending from the conical deflector 30 serve, as the drum 10 rotates, to lift material in the chamber 27, which material descends by gravity onto the deflector to be deflected thereby through a central outlet 32 in the second partition 24. It will be appreciated that the lifters 31, and the lifters 21 and 40 referred to below, need not be straight as shown, but may be curved to suit the flow characteris-tics of the material in passage. The second partition 24 i3 formedwith an annular deflector 33 which extends axially for substanti-ally the entire axial length of the second chamber 28. This deflec-tor has a frusto-conical outer surface and a frusto-conical inner surface, the latter defining a central region 28a of the second chamber 28, which central region is partitioned by the deflector from the outer annular region of the chamber. Process material discharged into the central region 28a of the second chamber strikes the inner frusto-conical surface of the deflector 33 to be deflected thereby into the third chamber 29. Lifters 21 are provided in the , , .: :
,, : . .
second chamber, Their function is to scavenge materials which may be accidentally deflected from the third chamber and to prevent them from being discharged via inlet openings 34, Gas or vapour to be added to the charge is introduced into ~he drum by way of the peripheral inlet openings 34 which communicate with the annular region of the second chamber 28, These openings communicate with a manifold formed by an annular casing 35 which encircles the drum. Gas or vapour is supplied to the manifold, at a pressure which is higher than that existing in the downstream zone 18 of the drum, by way of an inlet duct 36, and since the casing is stationary, annular seals 37, 38 mounted on the drum prevent leakage of the gas or vapour as the drum rotates.
~he flow of gas may be induced by means of an exhaust fan on the outlet side of the drum.
Gas from the annular region of the chamber 28 is dis-charged through an outlet 39 in the partition 25 into the third chamber 29. Process material deposited into the third chamber is lifted by radial lifters 40 extending from a central conical deflec-tor 41, the deflector 41 extending substantially for the full axial length of the third chamber and cooperating with a central opening 42 in the fourth partition 26. The process material, having been lifted is deposited onto the upper surface of the deflector 41, and is deflected thereby into the downstream zone 18 of the drum.
In this way, gas or vapour is introduced to the drum to be added to the charge, the intermediate zone being so arranged as to pre- , vent the charge from returning from the intermediate zone of the drum.
The modification illustrated in Figures 4 and 5 differs from the preceding embodiment in that means are provided for - ' ~ ' "~
~054587 adding a heavier-than-air material, such as a granular solid or a slurry, to the charge at the intermediate zone. In these Figures, parts which have exact counterparts in Figures 2 and 3 are denoted by the same reference numerals. In this case, however, instead of there being gas or vapour admitted to the drum, a granular solid or a liquid is fed by a chute 43 into an annular chute 44. The annular chute is formed by an annular casing which encircles the intermediate zone of the drum 10. The heavier-than-air material descending into the chute 44 is scooped up by scoops or buckats 45, lifted, and deposited into the second chamber 28 of the inter-mediate zone via peripheral openings 46. The casing 44, which is stationary, cooperates with rotary seals 47, 48 to prevent leakage of the additional material as the drum rotates.
As will be appreciated by those skilled in the art, in certain applications the axis of the drum may not be truly hori-zontal, but may be slightly inclined to the horizontal to assist the flow of material, Such cases are considered to be within the scope of the invention. Accordingly, the expression "generally horizontally mounted rotary drum" as used in the specification and claims is intended to mean a rotary drum which is mounted so that its axis of rotation is horizontal or slightly inclined to the horizontal.
Furthermore, it is to be understood that the terms "conical" and "frusto-conical", as applied to the deflector sur-faces of the "conical deflectors" and the "annular deflector" are not restricted to shapes which are conical and frusto-conical in the strict mathematical sense. In the illustrated embodiments the ~ ~
surfaces described by these terms are essentially flared surfaces ~ -of revolution which are approximately conical and frusto-conical~
: . .: ... . . . .
,, ~ ,,, . , , . -and the said terms as used in the specification and claims are deemed to describe such shapes.
. ~ . ~ . . .
in this case a gas, may be introduced to be added to the charge.
The details of the intermediate zone are shown in Figures 2 and 3. Essentially, this zone is formed by a plurality of, in this case four, axially spaced, transverse drum partitions 23,24,25, 26, which define a plurality of chambers, in this case first, second and third lifting chambers 27,28,29. The first partition 23 is formed by a slotted grid which defines an inlet to the first chamber 27. Ground material of a suitable size, or slurry or the like, can pass from the upstream drum zone 16 through the grid into the first chamber 27. The central portion of the partition 23 is connected to, or formed integrally with, a conical deflector 30 which extends axially for substantially the full axial length of the first chamber 27. Radial lifters 31 extending from the conical deflector 30 serve, as the drum 10 rotates, to lift material in the chamber 27, which material descends by gravity onto the deflector to be deflected thereby through a central outlet 32 in the second partition 24. It will be appreciated that the lifters 31, and the lifters 21 and 40 referred to below, need not be straight as shown, but may be curved to suit the flow characteris-tics of the material in passage. The second partition 24 i3 formedwith an annular deflector 33 which extends axially for substanti-ally the entire axial length of the second chamber 28. This deflec-tor has a frusto-conical outer surface and a frusto-conical inner surface, the latter defining a central region 28a of the second chamber 28, which central region is partitioned by the deflector from the outer annular region of the chamber. Process material discharged into the central region 28a of the second chamber strikes the inner frusto-conical surface of the deflector 33 to be deflected thereby into the third chamber 29. Lifters 21 are provided in the , , .: :
,, : . .
second chamber, Their function is to scavenge materials which may be accidentally deflected from the third chamber and to prevent them from being discharged via inlet openings 34, Gas or vapour to be added to the charge is introduced into ~he drum by way of the peripheral inlet openings 34 which communicate with the annular region of the second chamber 28, These openings communicate with a manifold formed by an annular casing 35 which encircles the drum. Gas or vapour is supplied to the manifold, at a pressure which is higher than that existing in the downstream zone 18 of the drum, by way of an inlet duct 36, and since the casing is stationary, annular seals 37, 38 mounted on the drum prevent leakage of the gas or vapour as the drum rotates.
~he flow of gas may be induced by means of an exhaust fan on the outlet side of the drum.
Gas from the annular region of the chamber 28 is dis-charged through an outlet 39 in the partition 25 into the third chamber 29. Process material deposited into the third chamber is lifted by radial lifters 40 extending from a central conical deflec-tor 41, the deflector 41 extending substantially for the full axial length of the third chamber and cooperating with a central opening 42 in the fourth partition 26. The process material, having been lifted is deposited onto the upper surface of the deflector 41, and is deflected thereby into the downstream zone 18 of the drum.
In this way, gas or vapour is introduced to the drum to be added to the charge, the intermediate zone being so arranged as to pre- , vent the charge from returning from the intermediate zone of the drum.
The modification illustrated in Figures 4 and 5 differs from the preceding embodiment in that means are provided for - ' ~ ' "~
~054587 adding a heavier-than-air material, such as a granular solid or a slurry, to the charge at the intermediate zone. In these Figures, parts which have exact counterparts in Figures 2 and 3 are denoted by the same reference numerals. In this case, however, instead of there being gas or vapour admitted to the drum, a granular solid or a liquid is fed by a chute 43 into an annular chute 44. The annular chute is formed by an annular casing which encircles the intermediate zone of the drum 10. The heavier-than-air material descending into the chute 44 is scooped up by scoops or buckats 45, lifted, and deposited into the second chamber 28 of the inter-mediate zone via peripheral openings 46. The casing 44, which is stationary, cooperates with rotary seals 47, 48 to prevent leakage of the additional material as the drum rotates.
As will be appreciated by those skilled in the art, in certain applications the axis of the drum may not be truly hori-zontal, but may be slightly inclined to the horizontal to assist the flow of material, Such cases are considered to be within the scope of the invention. Accordingly, the expression "generally horizontally mounted rotary drum" as used in the specification and claims is intended to mean a rotary drum which is mounted so that its axis of rotation is horizontal or slightly inclined to the horizontal.
Furthermore, it is to be understood that the terms "conical" and "frusto-conical", as applied to the deflector sur-faces of the "conical deflectors" and the "annular deflector" are not restricted to shapes which are conical and frusto-conical in the strict mathematical sense. In the illustrated embodiments the ~ ~
surfaces described by these terms are essentially flared surfaces ~ -of revolution which are approximately conical and frusto-conical~
: . .: ... . . . .
,, ~ ,,, . , , . -and the said terms as used in the specification and claims are deemed to describe such shapes.
Claims (4)
EXCLUSIVE PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS
FOLLOWS:
1. In an apparatus comprising a horizontally mounted rotary drum along which a charge is caused to flow from an upstream zone of the drum to a downstream zone which is axially spaced from the upstream zone, means defining an intermediate zone at which an additional material may be introduced into the charge, said means comprising a plurality of axially spaced transverse drum partitions defining first, second and third lifting chambers, the first chamber including inlet means communicating with said upstream zone for admitting charge from the upstream zone to the first chamber, outlet means communicating with a cen-tral region of the second chamber, and conical deflector means extending axially across the first chamber for substantially the entire axial length thereof, said conical deflector means coope-rating with said outlet means for deflecting charge from the first chamber to a central region of the second chamber, the second chamber including outlet means communicating with the third chamber, and annular deflector means extending axially across the second chamber for substantially the entire axial length thereof, said annular deflector means defining an annular region of the second chamber partitioned from the central region, the second chamber further including peripheral inlet means communicating with said annular region for the admission of additonal material thereto, the annular deflector means providing a pair of inner and outer frusto-conical deflector surfaces cooperating with the outlet means of the second chamber for deflecting charge from said central region, and material from said annular region, into the third chamber, the third chamber including outlet means communicating with said dwonstream zone and conical deflector means extending axially across the third chamber for substantially the entire axial length thereof, said conical deflector means cooperating with the outlet means of the third chamber for deflecting the charge and said additional material therethrough.
2. Apparatus according to claim 1, wherein the chambers are defined by first, second, third and fourth drum partitions, the first drum partition including an annular grid defining said inlet means, and said outlet means being defined by respective openings in the second, third and fourth partitions, said grid, said open-ings, and said deflector means being coaxial with one another and with the drum.
3. Apparatus according to claim 1, including an annular casing encircling the external surface of the drum at said inter-mediate zone and defining therewith a manifold communicating with said peripheral inlet means, and means for supplying a gas to the manifold.
4. Apparatus according to claim 1, including an annular casing encircling the external surface of the drum at said inter-mediate zone and defining therewith an annular chute communicating with said peripheral inlet means, means for supplying heavier than air material to the chute, and scoop means connected to the drum and rotatable therewith for conveying said material to the peri-pheral inlet means.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US443860A US3877650A (en) | 1974-02-19 | 1974-02-19 | Partition for tumbling mills or the like |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1054587A true CA1054587A (en) | 1979-05-15 |
Family
ID=23762474
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA219988A Expired CA1054587A (en) | 1974-02-19 | 1975-02-13 | Partition for tumbling mills or the like |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US3877650A (en) |
| CA (1) | CA1054587A (en) |
| MX (1) | MX3092E (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2538431C2 (en) * | 1975-08-29 | 1983-04-07 | Fa. Christian Pfeiffer, 4720 Beckum | Outlet wall for tube mills |
| GB1481260A (en) * | 1975-12-29 | 1977-07-27 | Smidth & Co As F L | Ventilated tube mills |
| GB2038202B (en) * | 1978-12-29 | 1982-12-01 | Smidth & Co As F L | Dry grinding a granular material |
| US5174512A (en) * | 1988-12-16 | 1992-12-29 | Snamprogetti S.P.A. | Grinding process and a continuous high-capacity micronizing mill for its implementation |
| JP3363148B1 (en) * | 2002-06-06 | 2003-01-08 | 有限会社大東土木 | Dry fine powder collection system |
| US9724655B2 (en) * | 2013-03-21 | 2017-08-08 | Lg Chem, Ltd. | Container for stirrer |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2031710A (en) * | 1931-08-29 | 1936-02-25 | Firm G Polysius Ag | Pulverizing apparatus |
| US2805827A (en) * | 1954-01-12 | 1957-09-10 | Stephen C Pierce | Device to introduce a liquid in metered amounts into a grinding mill |
-
1974
- 1974-02-19 US US443860A patent/US3877650A/en not_active Expired - Lifetime
-
1975
- 1975-02-13 CA CA219988A patent/CA1054587A/en not_active Expired
- 1975-02-18 MX MX100164U patent/MX3092E/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| MX3092E (en) | 1980-04-01 |
| US3877650A (en) | 1975-04-15 |
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