US3820727A - Liner for grinding mills - Google Patents

Liner for grinding mills Download PDF

Info

Publication number
US3820727A
US3820727A US00305435A US30543572A US3820727A US 3820727 A US3820727 A US 3820727A US 00305435 A US00305435 A US 00305435A US 30543572 A US30543572 A US 30543572A US 3820727 A US3820727 A US 3820727A
Authority
US
United States
Prior art keywords
lifter
liner
members
rows
guide
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 - Lifetime
Application number
US00305435A
Other languages
English (en)
Inventor
R Russell
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.)
MINERAL PROCESSING SYSTEMS Inc A PA CORP
Original Assignee
Koppers Co Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Koppers Co Inc filed Critical Koppers Co Inc
Priority to US00305435A priority Critical patent/US3820727A/en
Priority to CA181,244A priority patent/CA999280A/en
Priority to DE2348763A priority patent/DE2348763C3/de
Priority to JP11042673A priority patent/JPS571299B2/ja
Priority to FR7337395A priority patent/FR2206136B1/fr
Priority to GB4911073A priority patent/GB1397672A/en
Priority to ZA738271A priority patent/ZA738271B/xx
Priority to AU61968/73A priority patent/AU464027B2/en
Priority to BE137618A priority patent/BE807163A/xx
Priority to SE7315219A priority patent/SE402218B/xx
Application granted granted Critical
Publication of US3820727A publication Critical patent/US3820727A/en
Assigned to MINERAL PROCESSING SYSTEMS, INC., A PA CORP. reassignment MINERAL PROCESSING SYSTEMS, INC., A PA CORP. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: KOPPERS COMPANY, INC.
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • B02C17/18—Details
    • B02C17/22—Lining for containers

Definitions

  • ABSTRACT A grinding mill having an inner liner assembly which comprises a plurality of spaced guide members se- [22 ⁇ Filed: Nov. 10, 1972 [21] Appl. No.: 305,435
  • This invention relates generally to solid material comminution by contact between relatively moving portions of material and more particularly to the securing of wear liner assemblies to the inner periphery of grinding mills.
  • liner assemblies comprise a plurality of substantially flat liner members on the inner surface of the shell between which rows of lifter members are also bolted to the shell. Sometimes the liner members are bolted directly to the shell and have raised rib portions on their work surfaces thus excluding the need for separate lifter members.
  • the liner members protect the shell of the mill and the ribs or lifter members lift the ore toward the top of the rotating shell to a point where gravity causes the ore to tumble toward the bottom of the shell where it is reduced in size by impact with pieces of ore or with the liner and lifter members.
  • the lifter members tend to lift the grinding media in the same manner described for the ore.
  • the grinding media also tumbles toward the bottom of the shell and impacts against the ore.
  • Liner assemblies are customarily bolted to the inner peripheral surface of the mill shell by bolts extending from inside the mill, passing through the liners or lifters and then through the shell.
  • the bolts are secured by nuts tightened against packing washers and steel washers prevent leakage of ore fines through the shell.
  • lndividual sections of liners and lifter members are bolted to the shell and generally extend over the entire inner surface including portions of the ends or heads of the shell.
  • a large number of bolts are required to secure a liner assembly in place.
  • the use of such a large number of bolts requires considerable down time when liner sections are to be replaced. Each individual bolt must be re-installed to secure the new liner sections in place.
  • Lifter members also tend to overturn from the forces of heavy impact of the ore against them. Such forces induce tensile and bending moments in the bolts securing the members against the shell; the bolts sometimes elongate or shear resulting in loose lifters; as the bolts elongate or bend, the entire liner assembly may shift thereby making replacement of the liner assembly particularly CliffiCUlt.
  • an object of the present invention is to provide a grinding mill liner assembly that will overcome the aforementioned disadvantages and others.
  • this invention provides liner assemblies for grinding mills which are capable of being removed and replaced within the grinding mill with a minimum amount of bolt or screw removal.
  • a grinding mill with a liner assembly which comprises a plurality of spaced guide means secured to the inner peripheral surface of the grinding mill thereby forming rows of the guide means extending longitudinally of the axis of rotation of the mill; a liner means disposed between the rows of the guide means form liner rows adjacent to and along the length of each of the guide means; a lifter means coincident with each of the guide means and slidably engaged therewith along the length of the guide means to substantially overlie an edge portion of each of the adjacent liner rows thus forming rows of the lifter means alternately disposed with the liner rows; and a key lifter means secured to the inner surface of the grinding mill to maintain the alternate rows of the lifter means in their respective positions.
  • FIG. 1 is a side elevation in partial cross-section of a grinding mill generally illustrating the liner assembly of the present invention secured to the inner periphery of the shell, including the ends of the shell;
  • FIG. 2 is a partial end view of the mill taken along the line IIII of FIG. 1 illustrating the interior of the discharge end of the mill and the radial convergence of the liners and lifters of the lining assembly in the end of the mill;
  • FIG. 3 is an enlarged side elevation in partial crosssection of the-lower half of the grinding mill shell of FIG. 1 showing the novel liner assembly of the present invention
  • FIG. 4 is an enlarged axial section of a portion of the outer periphery of the shell taken along line IVIV of FIG. 3 illustrating the engagement of the lifter means with the guide means with the liners disposed between adjacent lifter means; 7
  • FIG. 5 is an enlarged axial section of a portion of the outer periphery of the shell taken along line VV of FIG. 3 illustrating the engagement of the key lifter means with the liners and the method of attachment of the key lifter means to the shell;
  • FIG. 6 is an enlarged axial section of a portion of the outer periphery of the shell showing an alternate embodiment of the key lifter means of the present inventron.
  • the liner assembly of the present invention is shown in connection with an autogenous grinding mill generally noted as numeral 10, in FIGS. 1 and 2.
  • the mill includes a shell generally noted as numeral 12 which includes a cylindrical shell portion 14 and a radially tapering feed end portion 16 and a similar discharge end portion 18.
  • Each of the ends 16 and 18 include a trunnion 20 and 22 respectively which supports the mill for rotation in bearings (not shown) in the conventional manner.
  • Feed end 16 includes a stationary feed chute 24 supported outside the mill (supports not shown) extending within trunnion through which ore is introduced into the interior of mill 10 along a feed cone 26 secured to trunnion 20.
  • the discharge end 18 includes a grate 28 spaced from the end of shell 18 to provide a space 30 for receiving ore fines for discharge out of mill 10 through the inside of cone 32 secured inside of trunnion 22.
  • Cone 34 defines the inner periphery of the space 30 adjacent discharge cone 32.
  • a liner assembly generally noted as numeral 36 covers substantially the entire interior surface of shell 12 except for the feed cone 26 and cone 34.
  • the profile of the liner assembly 36 is preferably made as shown in the cutaway portion of FIG. 1.
  • the liner elements are preferably made from short straight bars and plates as shown in FIGS. 1 and 2 since they are more easily installed than longer sections extending the full length of the shell.
  • liner assembly 36 comprises a plurality of spaced guide members 38 secured to the inner peripheral surface 40 of shell 14 such as by bolting (not shown) or more preferably such as by a weld 68 (FIG. 4), thereby forming rows of guide members 38 extending longitudinally of the axis of rotation of mill 10.
  • a liner member 42 is disposed between each row of guide member 38 forming liner rows adjacent to and along the length of each guide member 38.
  • Cylinder and head lifter members 44 which are coincident with each guide member 38 and slidably engaged therewith along the length of each guide member 38 substantially overlies and edge portion of each of the adjacent liner rows thus forming rows of lifter members 44 alternately disposed with the liner rows.
  • Guide members 38 have a gap or discontinuation 46, which has at least the equivalent length of a lifter member 44 located at a convenient place along the length of each guide member 38 to permit lifter members 44 to be removed and replaced from their respective lifter member row.
  • Key lifter members 48 are placed coincidently along the lifter member rows where gap 46 occurs. Key lifter members 48 are secured in place to the inner peripheral surface 40 of shell 14 such as by bolts 49 placed through bolt holes 50, thus maintaining the alternate rows of lifter members 44 and liner members 42 in their respective positions.
  • Similar guide members, liner members, lifter members, and key lifter members are likewise secured to ends 16 and 18 of shell 12.
  • longitudinally substantially abutting lifter segments form head lifter members 44 extending from cylinder lifter members 44 on the cylindrical shell 14 toward cone 34.
  • the liner members comprise arcuate segments disposed between head lifter members 44.
  • one liner member 54 extends between head lifter members 44.
  • Other liner segments 56 extends between head lifter members 44.
  • Other liner segments 58 also extend between head lifter members 44.
  • the entire surface of ends 16 and 18 are covered by the liner members, however, on discharge end 18, the outermost liners 54 and 56 include slots 60 to form grate 28 (FIG. 3) to permit ore fines to pass into space 30 (FIG. 3) for discharge through cone 32.
  • guide members 38 are provided on cylindrical shell 14 and on both ends 16 and 18 of grinding mill 10.
  • Guide members 38 are provided in a spaced relationship about the inner peripheral surface 40 of mill 10 in such manner that each guide member 38 is co-planar with a radius struck from the axis of rotation of mill 10. This arrangement results in equally spaced guide members 38 on the inner peripheral surface 40 of cylindrical shell 14 and converging guide members 38 on the inner peripheral surface 40 of ends 16 and 18. As shown in FIG.
  • guide members 38 are shown having a T shaped crosssection including rib portions 62 which are secured to the inner peripheral surface 40 of cylindrical shell 14 and to the inner peripheral surface 40 of ends 16 and 18 such as by a weld 68 or by any other suitable means; and flange portions 64 which are provided to accommodate similarly shaped slots 66 in lifter members 44.
  • guide members 38 is the preferred method of construction, it should be understood that other shaped guide members may also be utilized, such as Y shaped, V shaped, and any other properly shaped guide members (not shown). Any shaped guide member may be utilized as long as the slots in the lifter members corresponds to the shape of the guide members, and the shape is such that the lifter members will be securely held in place when engaged with the guide members.
  • each guide member 38 has a gap or discontinuation 46 along its length which is at least equivalent to the length of lifter members 44. In this manner each lifter member 44 is placed in position coincident with its respective guide member 38 and is slidably moved along the length of each guide member 38 which is engaged by slot 66 (FIG. 4) of each lifter member 44.
  • :1 gap 46 may be provided at either end of guide members 38 (not shown) or at any convenient point between the ends of guide members 38 (not shown). Preferably, the location of gap 46 is placed to provide the most expedient access for the removal and replacement of lifter members 44.
  • liner members 44 are placed end-to-end in substantially abutting relationship adjacent to and along the length of guide members 38 thus forming liner rows disposed between the spaced guide members 38.
  • Liner members 42 are of equal width when used in cylindrical shell 14, but have tapered widths corresponding to the converging guide members provided along ends 16 and 18.
  • Liner members 42 are provided with tapered edge portions 70 adjacent ribs 62 of guide members 38.
  • Each guide member 38 with its adjacent liner member rows having tapered edge portions 70 provide a path for lifter members 44 which are slidably moved along the length of guide members 38.
  • Lifter members 44 when positioned about inner peripheral surface 40, provide a discontinuous raised surface about cylindrical shell 14 and ends 16 and 18 with respect to the surface formed by liner members 42. It should be understood, however, that the discontinuous surfaces provided by liner members 42 and lifter members 44 actually provide a substantially continuous sur face of varying height about the inner peripheral sur face 40 of grinding mill l0.
  • each guide member 38 and the tapered edge portions 70 of adjacent rows of liner members 42 accommodates lifter members 44 having slots 66 corresponding in cross-section to guide members 38 and a tapered portion 72 which corresponds to the similarly tapered edge portions 70 of liner members 42.
  • Lifter members 44 are positioned in gap 46 (FIG. 3) of guide members 38 and then slidably moved along guide members 38 as previously described. Successive lifter members 44 are similarly placed along guide members 38 until each guide member 38 is completely engaged by a row of lifter members 44. With this arrangement the rows of lifter members 44 with tapered edge portions 72 overlie tapered edgeportions 70 ofthe adjacent rows of liner members Referring now to FIG.
  • key lifter members 48 are positioned coaxially with each row of lifter members in each gap 46 to secure the liner assembly 36 (FIG. 3) in place.
  • Key lifter members 48 and lifter members 44 are substantially the same size and shape except that key lifter members 48 are not provided with slots as are lifter members 44 and therefore do not engage guide members 38. Since the key lifter members 48 do not contain slots, they are positioned in each lifter member row where gap 46 (FIG. 3) occurs in each guide member 38. Therefore, with each gap 46 being of substantially equivalent length to lifter members 44 and key lifter member 48, the positioning of a key lifter member 48 in coaxial alignment with each row of lifter members 44 will complete a lifter member row.
  • Key lifter members 48 are provided with bolt holes 50 preferably placed side-byside across the width of key lifter members 48 to seat key lifter members 48 firmly in position and to provide greater resistance of key lifter member 48 to the shear forces produced when the rotating mill moves the ore andthe grinding media which have a tendency to remain at rest.
  • keyv lifter members 48 have tapered edge portions 74 adaptable to coincide with tapered edge portions of liner members 42.
  • Bolts 49 are placed in bolt holes 50 and secured to inner peripheral surface 40 thereby securing key lifter members 48 in its appropriate lifter member row.
  • FIG. 6 illustrates an alternate arrangement to the key lifter members when it is determined that the preferred key lifter member 48 (FIG. 5) would not be suitable because a different type or configuration of mill is to be used or where the ore to be gound is of such a size and shape that the possibility of overturning lifter members 44 may occur.
  • the alternate key lifter member is a unitary key lifter member 76 which corresponds substantially to two lifter members disposed in a side-by-side relationship separated by an interconnecting liner member 78. When a unitary key lifter member 76 is used it replaces the equivalent ofa liner member 42 and two adjacent key lifter members 50, (FIG. 5).
  • the unitary key lifter member 76 due: to its extreme width, has substantial resistance to overturning as compared to lifter members heretofore known. Only a single bolt 81 is needed in each unitary key lifter members 76 extension portion 80 as provided for by single bolt holes 82, since the resistance to overturning is increased by the extreme width of unitary key lifter member 76.
  • Each unitary key lifter member 76 is adaptable to be secured by bolts 81 through bolt holes 82 to the inner peripheral surface 40 of grinding mill l0, and are coincidental with alternate rows of liner members 42 and their respectively adjacent rows of lifter members 44.
  • guide members 38, lifter members 44, liner members 42, and key lifter members 48 form an interlocking protective liner assembly 36 about the inner peripheral surface 40 of grinding mill 10.
  • Key lifter members 48 are the only members of liner assembly 36 secured by bolts 49 to inner peripheral surface 40.
  • Lifter members 44 are only slidably movable along guide members 38 and therefore cannot be moved until a particular key lifter member 48 is removed.
  • Each row of lifter members 44 and key lifter members 48 overlies tapered edge portions 70 of adjacent rows of liner members 42 thus maintaining liner members 42 position.
  • each lifter member 44 is slidably moved along guide member 38 until the lifter member 44 disengages from guide member 38 as lifter member 44 reaches gap 46. The lifter member 44 may then be lifted out of gap 46.
  • all or the desired ones of lifter members 44 are removed as previously described liner members 42 may be removed from the liner rows adjacent to the lifter members 44 and their respective guide members 38.
  • a grinding mill is provided with a liner assembly with alternate rows of lifter members and liner members secured by rows of guide members in which each guide member has at least one key lifter member secured by bolts to the inner peripheral surface of the grinding mill.
  • a grinding mill having an inner liner assembly comprising:
  • a liner means disposed between said rows of said guide means forming liner rows adjacent to and along the length of each of said guide means;
  • a lifter means coincident with each of said guide means and slidably engaged therewith along the length of said guide means to substantially overlie an edge portion of each of said adjacent liner rows thus forming rows of said lifter means alternately disposed with said liner rows;
  • a key lifter means secured to said inner peripheral surface of said mill coaxially aligned with at least one of said rows of said lifter means and out of engagement with said guide means for maintaining said alternate rows of said lifter means and said liner means in their respective positions.
  • each row of said guide means includes at least one T shaped member with the base of the leg of said T" shaped member secured to said inner peripheral surface of said mill;
  • each row of said lifter means includes a T shaped slot adapted for sliding engagement longitudinally along said Tshaped guide means.
  • a unitary key lifter means corresponding substantially in cross-section to two of said lifter members disposed in a side-by-side relationship and separated by an interconnecting liner means;
  • each of said unitary key lifter means being secured to said inner peripheral surface of said mill coaxially with alternates of said rows of said liner means and their respectively adjacent said lifter means and out of engagement with said guide means thereby maintaining said alternate rows of said lifter means and said liner means in their respective positions.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
US00305435A 1972-11-10 1972-11-10 Liner for grinding mills Expired - Lifetime US3820727A (en)

Priority Applications (10)

Application Number Priority Date Filing Date Title
US00305435A US3820727A (en) 1972-11-10 1972-11-10 Liner for grinding mills
CA181,244A CA999280A (en) 1972-11-10 1973-09-17 Liner for grinding mills
DE2348763A DE2348763C3 (de) 1972-11-10 1973-09-28 Zusammengesetzte Auskleidung in einer Mühle
JP11042673A JPS571299B2 (US08124317-20120228-C00018.png) 1972-11-10 1973-10-01
FR7337395A FR2206136B1 (US08124317-20120228-C00018.png) 1972-11-10 1973-10-19
GB4911073A GB1397672A (en) 1972-11-10 1973-10-22 Liner for grinding mills
ZA738271A ZA738271B (en) 1972-11-10 1973-10-25 Grinding mill
AU61968/73A AU464027B2 (en) 1972-11-10 1973-10-29 Grinding mill
BE137618A BE807163A (fr) 1972-11-10 1973-11-09 Broyeur
SE7315219A SE402218B (sv) 1972-11-10 1973-11-09 Serskilt for malning av malm eller liknande avsedd kvarn med en utbytbart anordnad infodring

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00305435A US3820727A (en) 1972-11-10 1972-11-10 Liner for grinding mills

Publications (1)

Publication Number Publication Date
US3820727A true US3820727A (en) 1974-06-28

Family

ID=23180770

Family Applications (1)

Application Number Title Priority Date Filing Date
US00305435A Expired - Lifetime US3820727A (en) 1972-11-10 1972-11-10 Liner for grinding mills

Country Status (10)

Country Link
US (1) US3820727A (US08124317-20120228-C00018.png)
JP (1) JPS571299B2 (US08124317-20120228-C00018.png)
AU (1) AU464027B2 (US08124317-20120228-C00018.png)
BE (1) BE807163A (US08124317-20120228-C00018.png)
CA (1) CA999280A (US08124317-20120228-C00018.png)
DE (1) DE2348763C3 (US08124317-20120228-C00018.png)
FR (1) FR2206136B1 (US08124317-20120228-C00018.png)
GB (1) GB1397672A (US08124317-20120228-C00018.png)
SE (1) SE402218B (US08124317-20120228-C00018.png)
ZA (1) ZA738271B (US08124317-20120228-C00018.png)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3949943A (en) * 1973-11-02 1976-04-13 Evt Energie-Und Verfahrenstechnik Gmbh Mill bowl lining construction
US4323199A (en) * 1980-02-27 1982-04-06 The Hanna Mining Company Mill liner for dry autogenous mills
US4406417A (en) * 1980-02-27 1983-09-27 The Hanna Mining Company Mill liner for dry autogenous mills
US5361997A (en) * 1993-04-07 1994-11-08 Industrial Rubber Applicators, Inc. Discharge assembly for grinding mills
WO1995032802A1 (fr) * 1994-05-27 1995-12-07 Vladimir Georgievich Kochnev Revetement pour broyeurs a tambour autogenes

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0719713Y2 (ja) * 1990-11-27 1995-05-10 株式会社堤製作所 バレル研磨機のライニング材
CA2106226C (en) * 1992-09-22 1997-08-12 Vladimir Georgievich Kochnev Mill device
CN110694752B (zh) * 2019-11-12 2023-05-23 江西耐普矿机股份有限公司 用于半自和全自磨机的排矿装置

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL275126A (US08124317-20120228-C00018.png) * 1961-02-25
NL6406811A (US08124317-20120228-C00018.png) * 1963-06-18 1964-12-21
FR1492371A (fr) * 1965-08-02 1967-08-18 Skelleftea Gummifabriks A B Perfectionnements à un élément d'usure
BE793531A (fr) * 1972-02-02 1973-04-16 Koppers Co Inc Perfectionnements aux broyeurs

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3949943A (en) * 1973-11-02 1976-04-13 Evt Energie-Und Verfahrenstechnik Gmbh Mill bowl lining construction
US4323199A (en) * 1980-02-27 1982-04-06 The Hanna Mining Company Mill liner for dry autogenous mills
US4406417A (en) * 1980-02-27 1983-09-27 The Hanna Mining Company Mill liner for dry autogenous mills
US5361997A (en) * 1993-04-07 1994-11-08 Industrial Rubber Applicators, Inc. Discharge assembly for grinding mills
WO1995032802A1 (fr) * 1994-05-27 1995-12-07 Vladimir Georgievich Kochnev Revetement pour broyeurs a tambour autogenes

Also Published As

Publication number Publication date
SE402218B (sv) 1978-06-26
ZA738271B (en) 1974-09-25
JPS4978255A (US08124317-20120228-C00018.png) 1974-07-27
AU464027B2 (en) 1975-08-14
DE2348763A1 (de) 1974-05-16
DE2348763C3 (de) 1981-07-02
FR2206136B1 (US08124317-20120228-C00018.png) 1978-11-17
CA999280A (en) 1976-11-02
DE2348763B2 (de) 1980-12-04
BE807163A (fr) 1974-05-09
AU6196873A (en) 1975-05-22
FR2206136A1 (US08124317-20120228-C00018.png) 1974-06-07
GB1397672A (en) 1975-06-18
JPS571299B2 (US08124317-20120228-C00018.png) 1982-01-11

Similar Documents

Publication Publication Date Title
AU692914B2 (en) Grinding mill liner adapter
US4243182A (en) Liner assembly for ball mills
US3820727A (en) Liner for grinding mills
US3462090A (en) Liner for crinding mills
US3211387A (en) Grinding mill lining and control of the wear thereof
US3802634A (en) Method and apparatus for lining a grinding mill
US2246902A (en) Disintegrator of impact cage type
CA1110213A (en) Liners for crusher
US4165041A (en) Shell liner assembly for ore grinding mills
US4046326A (en) Shell liner assembly
BE906078A (nl) Mantelvoeringsamenstel.
US3659793A (en) Cage mill
US6663030B2 (en) Replaceable grate device for maximizing the throughput of solid material in ore mills
US3366338A (en) Segment-type grinding ring
WO2009121129A1 (en) A lifter bar assembly for a crushing mill and method of installation
US5950940A (en) Apparatus for comminuting sheet metal or similar material
US5046670A (en) Crushing device
US1339950A (en) Pulverizer
EP3932559B1 (en) Hydraulic crusher concave retaining system
US2185331A (en) Pulverizer
US3409236A (en) Segmented grinding roll assembly
US4736894A (en) Grinding mill lining system
US2893650A (en) Grinding mill end liners
US3269668A (en) Ball mill with tensional and wear-resistant linings
US2965321A (en) Sinter breaking apparatus

Legal Events

Date Code Title Description
AS Assignment

Owner name: MINERAL PROCESSING SYSTEMS, INC., 240 ARCH ST., YO

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:KOPPERS COMPANY, INC.;REEL/FRAME:004195/0483

Effective date: 19831007