US3739993A - Grinding mills - Google Patents

Grinding mills Download PDF

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Publication number
US3739993A
US3739993A US00137448A US3739993DA US3739993A US 3739993 A US3739993 A US 3739993A US 00137448 A US00137448 A US 00137448A US 3739993D A US3739993D A US 3739993DA US 3739993 A US3739993 A US 3739993A
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US
United States
Prior art keywords
zone
lifter
mill
grate
lifters
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Expired - Lifetime
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US00137448A
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English (en)
Inventor
J Nelson
R Guerguerian
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BOLIDEN ALLIS CANADA Inc 3136 MAVIS RD MISSISSAUGA ONTARIO L5C 1T8 CANADA A CORP OF PROVINCE OF ONTARIO CANADA
General Electric Canada Co
Original Assignee
Dominion Engineering Works Ltd
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Publication date
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Publication of US3739993A publication Critical patent/US3739993A/en
Assigned to GENERAL ELECTRIC CANADA INC./GENERALE ELECTRIQUE DU CANADA INC. reassignment GENERAL ELECTRIC CANADA INC./GENERALE ELECTRIQUE DU CANADA INC. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: CANADIAN GENERAL ELECTRIC COMPANY LIMITED/COMPAGNIE GENERALE ELECTRIQUE DU CANADA LIMITEE
Assigned to BOLIDEN ALLIS CANADA INC., 3136 MAVIS RD., MISSISSAUGA, ONTARIO, L5C 1T8, CANADA, A CORP. OF THE PROVINCE OF ONTARIO, CANADA reassignment BOLIDEN ALLIS CANADA INC., 3136 MAVIS RD., MISSISSAUGA, ONTARIO, L5C 1T8, CANADA, A CORP. OF THE PROVINCE OF ONTARIO, CANADA ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: GENERAL ELECTRIC CANADA INC.
Assigned to CANADIAN GENERAL ELECTRIC COMPANY LIMITED-COMPAGNIE GENERALE ELECTRIQUE DU CANADA LIMITEE reassignment CANADIAN GENERAL ELECTRIC COMPANY LIMITED-COMPAGNIE GENERALE ELECTRIQUE DU CANADA LIMITEE ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: DOMINION ENGINEERING WORKS LIMITED - LES ATELIERS D'INGENIERIE DOMINION LIMITEE
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
    • B02C17/18—Details
    • B02C17/183—Feeding or discharging devices
    • B02C17/1835—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

Definitions

  • ABSTRACT An autogenous grinding mill of large diameter has curved lifters to give improved radially inward displacement of reduced material, after passage through the primary grates; and secondary grates in the form of box sections combined with the curved surfaces of the lifters, for segregation of totally reduced fines, with passage of intermediately sized material back to the mill reduction section.
  • FIG. 1 4 Claims, 3 Drawing Figures PATENIEU 9W3 mmniz 7 FIG. 1
  • Patent Agent 7 PAINTED-' 3.739.993
  • This invention is directed to grinding mills, and in particular to arrangements for controlling the discharge of fine material from mills.
  • the present invention provides an improved mill extraction arrangement wherein the annular discharge end zone of a mill is provided with inclined lifters to facilitate the discharge of material from the mill.
  • the present invention provides, in combination with inclined lifters within a mill, an internal screening arrangement to segregate ground material from semifinished material, and to discharge the fine material from the mill, while recycling the semi-finished material within the mill to the mill grinding section, for further reduction.
  • the present invention is suitable for practicing with both dry and wet mills, and with rod, ball and semiautogenous or autogenous mills.
  • the present invention thus provides a grinding mill for reducing friable material, having a rotatable shell, at least one material reducing zone therein, loading means at one end of the shell, intermediate partition means within the shell spaced axially from the loading means to form an annular lifter zone adjacent the reducing zone, discharge sizing grate means between the zones to permit passage of grate sized material to the lifter zone from the reducing zone, and a plurality of inclined lifters within the lifter zone, each lifter having a portion of the length thereof extending in inclined non-radial relation inwardly from the lifter zone outer periphery, and material discharge means to discharge from the lifter zone ground material received in operation of the mill from the reducing zone and deposited on rotation of the mill by inclination of the lifters.
  • the present invention further provides in a grinding mill having a lifter zone spaced axially from a material reducing zone, with a plurality of inclined lifter means extending outwardly to divide the lifter zone into a plurality of like non-radial lifter zone segments, primary grate wall means dividing at least a portion of the lifter zone from the reducing zone to permit passage to the lifter zone of a primary size limited fraction of partially reduced material in operation, box wall means within the lifter zone to subdivide at least some of the lifter zone segments into a lifter fines portion and a lifter return portion, secondary grate wall means forming a portion of the box-wall means to permit a secondary size fraction of the primary size to pass from the return lifter portion to the lifter fines portion, material discharge means connecting with the lifter fines subsegments to receive in operation secondary size material therefrom, and material return means connecting with the lifter return segment portions and the mill reducing zone, to return the portion of the primary size fraction sized in excess of the secondary size back
  • a form of curved lifter is preferred.
  • improved lifter operations may be obtained using a straight lifter inclined outwardly from the radial direction to lead in the direction of rotation.
  • a lifter of this inclined form, whether curved, straight or of composite form provides an extended period of material transfer, with a tendency for the material to slide along the supporting surface of the lifter in regulated fashion instead of pitching radially inwardly, as in the case of the radial type of lifter.
  • the improved operation provided by inclined lifters as contrasted with radial lifters may be at least partially attributed; to the scooping or ploughing effect of the lifter as it enters and passes through the inclined sliding pulp zone; to the increased effective length of lifter surface submerged in the pulp zone, due to the effective non-radial component of lifter length; and to the earlier initial sliding of fines in a discharging direction inwardly from the toe of the lifter, due to the inclination of the lifter beyond the recline angle when located closer to the pulp zone.
  • the time available for fines discharge is correspondingly lengthened, and improved displacement and velocity profile obtained.
  • FIG. 1 is a diametral sectional view of a mill accord ing to the present invention.
  • FIG. 2 is a pictorial representation of the mill lifter zone viewed from within the mill, with FIG. 3 comprising an enlargement of a portion of one lifter.
  • the mill shell 10 shown in diametral section, is mounted for rotation about a horizontal axis, having hollow trommels at the shell ends ll, 12 for charging and discharging the mill, in known fashion.
  • the inclined shell walls 15, 16 are provided with wedge bars 17 serving to energize or entrain the semifluid contents of the mill, and are rubber lined to resist abrasion.
  • annular partition 20 segregates the reducing or grinding zone 21 from the lifter zone 22.
  • a plurality of primary grates 23, 25, illustrated also in FIG. 2 in the partition 20 permit the passage from the reducing zone 21 to the lifter zone 22 ofsuitably reduced material, including portions reduced to the desired minimum mesh size and below, together with larger particles of intermediate size.
  • the lifters 30 subdivide the annular lifter zone 22 into a plurality of lifter sub zones or segments 33.
  • a so called rubber box 35 having an upper surface thereof in the form of a secondary grate 36.
  • the wedge bars 17 are omitted, for purposes of clarity.
  • the inwardly extending boxes 35 which extend for the full axial extent of the lifters 30 at the radially outer extremity, are of reduced axial width and increased pcripheral extent at the mouths 37, to form an annular discharge of abutting slots, leaving free a portion of the lifter spaces 33 axially adjacent thereto, to permit the passage of coarser material too large to pass through the secondary grates 36.
  • suitable trommel partition means the material of secondary size and smaller passes axially through the trommel 12 and is collected outside of the mill 10, for subsequent use.
  • the material of primary size and smaller is returned by the trommel partition means into the mill for further reduction.
  • the boxes 35 are lined with or formed of suitable rubber, plastic or other wear resistant material.
  • the earlier discharge of fines after leaving the pulp pool leads to earlier discharge from the lifter zone. This effectively reduces the velocity of discharge, to minimize or prevent throw of the material against the back of the preceding lifter. More importantly the work done against the mill is reduced, owing to the reduced lift head, so that power requirements diminish, or mill size or loading may be correspondingly increased.
  • non-radial straight lifters are contemplated, arranged in semi-chordal relation to the grinding zone.
  • a grinding mill for reducing friable material to a pulp condition having a rotatable shell, at least one material reducing zone therein, loading means at one end of the shellto supply said material to said zone, intermediate partition means within the shell spaced axially from the shell other end to form an annular lifter zone axially adjacent the reducing zone, first sizing grate means between the zones to permit passage of grate sized material to the lifter zone from the reducing zone, a plurality of inclined lifters within the lifter zone each having a portion of the length thereof extending in inclined non-radial relation inwardly from the lifter outer zone periphery, to provide advanced initial inward acceleration of said material on inclination of the lifter, said lifters dividing said lifter zone into adjacent primary zone portions, second grate means in the surface of said lifters, wherein the improvement comprises box means underlying said second grate means to receive in operation a secondary fraction of material passing through the second grate means, said box means projecting within the adjacent said primary zone
  • said first discharge means connected to said primary segments comprises an annular discharge port having adjacent segment portion thereof connected to respective ones of said primary segments, to pass said primary pulp portion axially into the mill.

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
  • Crushing And Pulverization Processes (AREA)
US00137448A 1970-05-11 1971-04-26 Grinding mills Expired - Lifetime US3739993A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA82368 1970-05-11

Publications (1)

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US3739993A true US3739993A (en) 1973-06-19

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US00137448A Expired - Lifetime US3739993A (en) 1970-05-11 1971-04-26 Grinding mills

Country Status (6)

Country Link
US (1) US3739993A (enrdf_load_stackoverflow)
AU (1) AU2680471A (enrdf_load_stackoverflow)
CA (1) CA927353A (enrdf_load_stackoverflow)
DE (1) DE2122706A1 (enrdf_load_stackoverflow)
GB (1) GB1305864A (enrdf_load_stackoverflow)
ZA (1) ZA711697B (enrdf_load_stackoverflow)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4116391A (en) * 1977-06-06 1978-09-26 Allis-Chalmers Corporation Ball discharger for grinding mill
US4172560A (en) * 1978-03-13 1979-10-30 Vermillion Equipment & Supply Co., Inc. Replaceable liner for the discharge assembly of a rotary grinding mill or the like
US4266733A (en) * 1978-03-13 1981-05-12 Butler William J Replaceable liner for the discharge assembly of a rotary grinding mill or the like
US4646980A (en) * 1985-05-20 1987-03-03 Evans Products Company Cone discharge for diaphragm discharge rotary grinding mill
RU2190473C2 (ru) * 2001-01-12 2002-10-10 Открытое акционерное общество "ТЯЖМАШ" Устройство для измельчения кусковых материалов
US20110068207A1 (en) * 2008-05-27 2011-03-24 Robert Mepham Discharge end liner
US20110146933A1 (en) * 2008-08-01 2011-06-23 Page David J Unidirectional discharge grate assembly
US20110186666A1 (en) * 2010-02-03 2011-08-04 Outotec Oyj Multi-stage discharger for grinding mills
US9289775B2 (en) 2012-11-22 2016-03-22 Polycorp Ltd. Discharge grate assembly
WO2021136863A1 (en) 2019-12-30 2021-07-08 Metso Outotec Finland Oy Grate support element and open-ended grinding mill
CN118181587A (zh) * 2024-05-06 2024-06-14 江苏环特智能科技有限公司 一种塑料原料加工的多级研磨装置及其使用方法

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1146918A (en) 1979-10-26 1983-05-24 Rhual L. Guerguerian Discharge zone fastening assembly for grinding mill
FI102149B (fi) * 1995-03-08 1998-10-30 Valtion Teknillinen Menetelmä rakeisen materiaalin jauhamiseksi ja jauhinlaitteisto
RU2271251C1 (ru) * 2004-07-13 2006-03-10 Открытое акционерное общество "ТЯЖМАШ" Барабанная мельница

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1055599A (en) * 1910-11-15 1913-03-11 Ball & Jewell Pebble-mill.
US1309800A (en) * 1919-07-15 haitsen
US1627487A (en) * 1925-09-30 1927-05-03 Paul L Crowe Baill mill
DE646065C (de) * 1934-08-30 1937-06-09 Carl Gustaf Halvar Loewenhielm Abfuhrvorrichtung bei Kugel- oder Rohrmuehlen
DE665654C (de) * 1935-09-09 1938-09-30 American Ball Mill Company Siebanordnung fuer Trommelmuehlen
FR901764A (fr) * 1942-07-07 1945-08-06 Krupp Fried Grusonwerk Ag Broyeur à plusieurs chambres
US3633832A (en) * 1968-01-16 1972-01-11 Smidth & Co As F L Apparatus for grinding mineral materials

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1309800A (en) * 1919-07-15 haitsen
US1055599A (en) * 1910-11-15 1913-03-11 Ball & Jewell Pebble-mill.
US1627487A (en) * 1925-09-30 1927-05-03 Paul L Crowe Baill mill
DE646065C (de) * 1934-08-30 1937-06-09 Carl Gustaf Halvar Loewenhielm Abfuhrvorrichtung bei Kugel- oder Rohrmuehlen
DE665654C (de) * 1935-09-09 1938-09-30 American Ball Mill Company Siebanordnung fuer Trommelmuehlen
FR901764A (fr) * 1942-07-07 1945-08-06 Krupp Fried Grusonwerk Ag Broyeur à plusieurs chambres
US3633832A (en) * 1968-01-16 1972-01-11 Smidth & Co As F L Apparatus for grinding mineral materials

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4116391A (en) * 1977-06-06 1978-09-26 Allis-Chalmers Corporation Ball discharger for grinding mill
US4172560A (en) * 1978-03-13 1979-10-30 Vermillion Equipment & Supply Co., Inc. Replaceable liner for the discharge assembly of a rotary grinding mill or the like
US4266733A (en) * 1978-03-13 1981-05-12 Butler William J Replaceable liner for the discharge assembly of a rotary grinding mill or the like
US4646980A (en) * 1985-05-20 1987-03-03 Evans Products Company Cone discharge for diaphragm discharge rotary grinding mill
RU2190473C2 (ru) * 2001-01-12 2002-10-10 Открытое акционерное общество "ТЯЖМАШ" Устройство для измельчения кусковых материалов
US20110068207A1 (en) * 2008-05-27 2011-03-24 Robert Mepham Discharge end liner
US8360350B2 (en) 2008-05-27 2013-01-29 Polycorp Ltd. Discharge end liner
US8308906B2 (en) 2008-08-01 2012-11-13 Polycorp Ltd. Unidirectional discharge grate assembly
US20110146933A1 (en) * 2008-08-01 2011-06-23 Page David J Unidirectional discharge grate assembly
US8109457B2 (en) * 2010-02-03 2012-02-07 Outotec Oyj Multi-stage discharger for grinding mills
US20110186666A1 (en) * 2010-02-03 2011-08-04 Outotec Oyj Multi-stage discharger for grinding mills
US9289775B2 (en) 2012-11-22 2016-03-22 Polycorp Ltd. Discharge grate assembly
WO2021136863A1 (en) 2019-12-30 2021-07-08 Metso Outotec Finland Oy Grate support element and open-ended grinding mill
EP4084907A4 (en) * 2019-12-30 2023-10-25 Metso Outotec Finland Oy GRATE SUPPORT ELEMENT AND OPEN END GRINDER
US12201990B2 (en) 2019-12-30 2025-01-21 Metso Finland Oy Grate support element and open-ended grinding mill
CN118181587A (zh) * 2024-05-06 2024-06-14 江苏环特智能科技有限公司 一种塑料原料加工的多级研磨装置及其使用方法

Also Published As

Publication number Publication date
GB1305864A (enrdf_load_stackoverflow) 1973-02-07
CA927353A (en) 1973-05-29
AU2680471A (en) 1972-09-28
ZA711697B (en) 1971-12-29
DE2122706A1 (de) 1971-11-25

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Legal Events

Date Code Title Description
AS Assignment

Owner name: BOLIDEN ALLIS CANADA INC., 3136 MAVIS RD., MISSISS

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:GENERAL ELECTRIC CANADA INC.;REEL/FRAME:005060/0180

Effective date: 19881027

Owner name: CANADIAN GENERAL ELECTRIC COMPANY LIMITED-COMPAGNI

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:DOMINION ENGINEERING WORKS LIMITED - LES ATELIERS D INGENIERIE DOMINION LIMITEE;REEL/FRAME:005041/0142

Effective date: 19831231

Owner name: GENERAL ELECTRIC CANADA INC./GENERALE ELECTRIQUE D

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:CANADIAN GENERAL ELECTRIC COMPANY LIMITED/COMPAGNIE GENERALE ELECTRIQUE DU CANADA LIMITEE;REEL/FRAME:005041/0146

Effective date: 19890112