EP0022758B1 - Wear and abrasion resistant wall structure, particularly for mills for grinding a charge comprising magnetic material - Google Patents

Wear and abrasion resistant wall structure, particularly for mills for grinding a charge comprising magnetic material Download PDF

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Publication number
EP0022758B1
EP0022758B1 EP80850102A EP80850102A EP0022758B1 EP 0022758 B1 EP0022758 B1 EP 0022758B1 EP 80850102 A EP80850102 A EP 80850102A EP 80850102 A EP80850102 A EP 80850102A EP 0022758 B1 EP0022758 B1 EP 0022758B1
Authority
EP
European Patent Office
Prior art keywords
wall structure
mill
abrasion
lifters
grinding
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
Application number
EP80850102A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0022758A1 (en
Inventor
Bertil Brandt
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.)
Trelleborg AB
Original Assignee
Socared SA
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 Socared SA filed Critical Socared SA
Priority to AT80850102T priority Critical patent/ATE2399T1/de
Publication of EP0022758A1 publication Critical patent/EP0022758A1/en
Application granted granted Critical
Publication of EP0022758B1 publication Critical patent/EP0022758B1/en
Expired legal-status Critical Current

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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
    • B02C17/225—Lining for containers using rubber or elastomeric material

Definitions

  • the present invention relates to a wear and abrasion resistant wall structure which in use is subjected to abrasion by lump or particulate material comprising magnetic particles.
  • Such walls may have the form of wall surfaces in chutes, ducts, conveyor belt unloading stations etc., but above all in mills.
  • mills for grinding ore, in- which the walls are subjected to heavy wear and are therefore constituted by or coated with a wear and abrasion resistant wall material.
  • Such mills may comprise ball or rod mills for grinding ore containing a given amount of magnetic material.
  • the mills may be of the type for primary and secondary grinding in which the material to be ground consists of magnetic material, for example magnetite, and in which the coarse material of the charge constitutes grinding balls or pebbles, so-called autogenous grinding.
  • the mills for such purposes must have a wear and abrasion resistant inner side. Therefore, the mills are often provided with a lining of abrasion resistant material, such as elastomeric or plastic material, ceramic material or sometimes steel material.
  • the lining of abrasion resistant material is usually fastened by mechanical means such as fastening bolts, clamping ribs or like means.
  • U.S. Patent 3,913,851 (October 21, 1975, Sven E. Andersson) the inventor suggests that a wear resistant rubber lining for mills and chutes be magnetically retained to the inner side of the mill barrel or chute in that the side of the wear resistant rubber layer facing the barrel or chute has been laminated with a layer of permanent-magnetic material.
  • Mill linings mainly have two tasks. One is to provide a protection for the mill barrel and the end walls thereof against mechanical and corrosive abrasion, and the other is to transmit energy from the mill to the charge. This implies that the appearance of the inner side of the mill, the so-called profile, is of great importance to the grinding capacity, particularly in secondary grinding (fine grinding).
  • Rubber lifters thus suffer from the drawbacks that the grinding capacity will vary considerably during their life of use and that the lifters will have to be changed when the lining profile is at its best; in other words, one must allow for a running-in period of lower capacity and undesirable coarse rests in the discharged material ground. This particularly applies to fine grinding operations in mills running at a speed of over 75% of the so-called critical speed.
  • a mill lining could be worn to the same extent all over the lining and that the life thereof could be extended to periods of one year or more so that the necessary exchanges could be performed during normal standstill periods, that is the holiday period.
  • Norwegian Patent 22,213 suggest the use of electromagnets for lifting, during the rotation of the mill, the grinding balls of magnetic material to the requisite height level and then letting them fall onto the material being ground.
  • the electromagnets are arranged close to the outer side of a mill barrel consisting of lamellae of magnetizable material, the arrangement being such that the grinding balls are retained against the mill barrel solely as they are lifted to a suitable level.
  • One object of the present invention therefore is to improve the linings of prior art mills and to permit extending their life.
  • Another object of the invention is to provide a wear protection for walls automatically regenerating itself.
  • a further object of the invention is to provide a mill barrel with means producing an automatically regenerating wear protection on the inner side of the mill barrel.
  • the present invention provides a wear and abrasion resistant wall structure which in use is subjected to abrasion by lump or particulate materials comprising magnetic particles.
  • At least the side of the wall structure which is subjected to wear and abrasion is preferably constituted by or coated with an abrasion resistant wall material, for example in form of shell plates and lifters.
  • the wall structure shall have magnet means so placed as to attract magnetic particles in the charge and retain said particles in the form of an automatically regenerating abrasion protective layer on the surface of the wall structure subjected to wear and abrasion, within at least such zones as are normally exposed to a heavier abrasion than the other zones of the wall structure.
  • the harmful sliding abrasion can be restricted by furnishing the smooth lining, in conformity with the present invention, with magnets in a system that provides an all-covering bed of magnetic particles, a "fluidized bed", which is magnetically retained in such a profile that the charge is raised to a suitable level for maximum grinding capacity. Abnormal shearing forces between the charge and the mill barrel are taken up in said fluidized bed, thereby preventing an exaggerated sliding directly against the inner side of the lining.
  • the invention When the invention is to be utilized for the grinding of non-magnetic material, such as sulphide ores, one must add magnetic material, for example magnetite, to the charge to obtain the automatically regenerating abrasion protective layer on the lining.
  • the magnetic material should be relatively fine-grained (up to about 5 mm). As the finer material will come to lie at the mill barrel the magnetic material will place itself at the zones on the lining to be coated with the automatically abrasion protective layer. Magnetic residues, if any accompanying the ground material out of the mill can be collected by causing the ground material to pass a simple magnetic separating drum of conventional construction at the outlet of the mill. These residues can then again be introduced into the grinding cycle or be otherwise collected.
  • a great advantage which is inherent in the present invention is that the magnetic circuit when permanent magnets are used will be constantly closed, on the one hand, by metal inserts or the mill barrel or drum made from a magnetic metal material and, on the other hand, by the fine-grained layer of magnetic particles attracted by the magnets. This will automatically provide a good safety against demagnetization.
  • the present invention however is based on the realization that magnetism might be used to provide an automatically regenerating wear protection layer for the inner side of the mill barrel, which may in itself have been formed from an abrasion and wear resistant material, for example elastomeric material.
  • the invention is thus based on a technical idea different from that of the U.S. Patent 3,913,851.
  • the object of the electromagnets is a different one from that of the magnets in the wall structure exposed to wear according to the present invention and besides the magnetization is supposed to be temporarily interrupted for release of the grinding balls such that said balls can fall onto the material being ground, which stays by gravity in the lower region of the mill by sliding along the mill barrel, thereby exposing it to abrasion and necessitating a lining of abrasion resistant material even though the wear caused by the grinding balls proper has been reduced.
  • the present invention has another object namely that of providing a wear protection which protects the wall structure, particularly the mill wall, against abrasion and which automatically regenerates itself.
  • the mill shown in Fig. 1 has a mill barrel 10 with a lining clamped to the inner side thereof.
  • Said lining comprises shell plates 11 of wear resistant rubber and has protruding fastening flanges 12.
  • the lining also comprises lifters 13 which include an elastomer or rubber portion 14 with an undercut groove 15 therein for accommodating a metal bar 16 with bolts 17 welded thereto which project through holes in the mill barrel and cooperate with washers 18 and nuts 19. T-bolts may be substituted for said bolts and said bars.
  • the mill lining 11, 13 is thus kept in position in that the protruding fastening flanges 12 of the barrel plates 11 are clamped to the mill barrel 10 by means of the metal bar 16 located in the undercut groove 15 of the lifters 14.
  • Other methods for fastening the lining also fall within the scope of the invention.
  • the lifters 13 have been provided with inserts 20, to which a number of permanent magnets 21 are secured.
  • the permanent magnets project slightly from the surfaces of the lifters 13 at their leading sides when the mill rotates in the direction of the arrow 22. It may sometimes be advantageous however to have the permanent magnets terminate immediately below the surfaces of the lifters.
  • the south and north poles of the permanent magnets 21 are alternately facing outwards and the permanent magnets will thus attract magnetic particles in the charge of the mill such that said particles are retained in the form of a layer 23.
  • This layer serves as an automatically regenerating wear protection means for the lifters 13 since the charge impinges upon said layer and is prevented from exerting an equally heavy abrading effect on the lifters as if no layer 23 existed.
  • the magnetic particles in the layer 23 may certainly come loose when the charge impinges upon the layer 23 but new magnetic particles in the charge will be attracted so that the protective layer 23 is maintained intact also during the continued rotation of the mill barrel.
  • Fig. 1 the automatically regenerating wear protecting means of magnetic particles has been illustrated only on the left-hand lifter to make a comparison with conventional lifters appear more clearly.
  • dash and dot lines 100, 101, 102 and 103 how a conventional lifter entirely of rubber material changed its profile during the course of a lengthy test in a mill where the inventive principle was tested simultaneously with the use of conventional lifters.
  • the portions 14 of the lifters 13, the shell plates and the conventional lifters consisted of the same wear resistant rubber material.
  • the mill had a diameter of 5.9 m and was continuously driven for secondary grinding with the aid of lumps of magnetite and of quartz in mixture (particle size maximum 60 mm), so-called pebbles.
  • the conventional lifters originally had the profile represented by line 100, while lines 101, 102 and 103 represent the profiles of the remaining lifter rests after continuous operation for 7 months, 14 months and 21 months, respectively.
  • profile 103 has been reached, i.e. after 21 months, the time had come to insert new conventional lifters.
  • the rubber portion 14 of the lifters 13 equipped with permanent magnets 21 had been subjected to wear in a minor degree only, as has been shown by the dotted line 14' on the right-hand lifter in Fig. 1.
  • the automatically regenerating wear protection layer 23 was not entirely homo- generous but comprised an inner per se homogeneous layer 23' of very fine-grained magnetic material and an outer inhomogeneous 23" of coarser magnetic mineral particles and heavily worn down magnetite grinding bodies or pebbles.
  • Fig. 2 shows another example of how it has been found possible to utilize the invention for the protection of a mill barrel against wear.
  • the mill had been designed as a primary mill, i.e. a mill for grinding of coarse starting material.
  • the mill lining had been given wave shape in that the shell plates 24 had been formed as steps having a low portion 25 and a high portion 26 which is however lower than the upper side of the lifters 27.
  • the fixation of the lifters and the shell plates had been realized in substantially the same manner as in Fig. 1.
  • the shell plates 24 had been provided with metal inserts 20 and permanent magnets 21 secured thereto.
  • the permanent magnets placed on successively higher levels will provide a slightly inclined surface profile with a protective layer 23 of magnetic particles which were attracted by the permanent magnets in the same way as in Fig. 1.
  • the protective layer 23 had a laminar composition including an inner fine-grained part layer and outer, coarser part layers.
  • the layer 23 formed a continuous fluidized bed which offered an efficient protection against the abrasion of the lining.
  • Fig. 3 shows a further embodiment in which lifters 28 produced from a rubber or elastomeric material are vulcanized to a meta! sheet 29 which protrudes in either direction. These lifters are kept in position with the aid of rubber or elastomer elements 30 having a metal profile member 31 vulcanized thereinto and cooperating with T-bolts 32, washers 33 and nuts 34, said elements 30 clamping the metal sheet 29 to the mill barrel 10.
  • the lifter 28 has permanent magnets 21 vulcanized thereinto. Said magnets 21 are mounted on a metal insert 20 and retain a regenerative, protective layer 23 which is formed by magnetic particles in the charge of the mill being attracted and retained by the permanent magnets 21. In this case the permanent magnets have been placed in such a manner that the protective layer 23 also extends a distance beyond the lifter proper, thus protecting also the low portion in front of the lifter where normally high abrasion occurs.
  • Figs. 4 and 5 show still another embodiment of the invention in which the lifters are otherwise designed and provided with a protective shield.
  • the mill barrel 10 is thus lined with shell plates 35 which are united with metal sheets 36 projecting in either direction.
  • lifters 37 having an outer protective sheath 38 of non-magnetic, wear resistant metallic material
  • permanent magnets 21 which are secured to an insert 20 of magnetic metallic material.
  • the permanent magnets and the insert are kept in position with the aid of a polyurethane rubber layer 39.
  • Other plastic or elastomeric materials are conceivable.
  • the lifters are kept in position with the aid of a profile bar 40 inserted therein, which is held clamped against the undercut groove formed in the lifters by means of bolts 41 and nuts 42 which penetrate the mill barrel 10.
  • the permanent magnets 21 are arranged with their south and north poles as indicated on the drawings such that a protective layer 23 of magnetic particles from the charge will be formed on the outer side of the protective shield 38.
  • the lifter 37 can be given a relatively short length for example of 100 mm.
  • the requisite total lifter length is obtained by placing several lifters one after the other and retaining them with the aid of a common fastening bar 40 or with the aid of several such fastening bars following upon each other.
  • This embodiment is especially intended for use in rod grinding, i.e. grinding in mills where use is made of rod- shaped grinding bodies and in which there is the risk that worn spear-like rod ends will penetrate into the lifters and damage them.
  • the magnet system is symmetrically designed, which means that the rotation of the' mill can be reversed.
  • Fig. 6 shows a similar embodiment in which the permanent magnets are placed in a symmetrical arrangement.
  • the lifter 43 of rubber or other elastomeric material has a metal profile member 44 vulcanized thereto, in which an undercut groove 45 is provided for cooperation with T-bolts 32 and nuts 34.
  • the lifter clamps shell plates 35 in position with the aid of the metal sheets 36 vulcanized to said shell plates.
  • the permanent magnets 21 are secured to an insert 20 and have their active pole surfaces at the bottom of conical recesses 48.
  • particulate magnetic material in the charge will fill out said conical recesses and thus serve as a regenerative, protective layer outside the permanent magnets and also outside the rubber or elastomer portions of the lifters 43.
  • the lifter is symmetrical, for which reason the direction of rotation of the mill can be reversed.
  • FIG. 7 is shown a further embodiment in which electromagnets are employed for the same purpose. Said embodiment resembles that of Figs. 4 and 5, but instead of a protective shield of non-magnetic material, use is made of embedded magnetic steel plates 49 which serve as pole plates on electromagnets 50 secured to a magnetic steel insert 20. The magnets 50, the insert 20 and the pole plates 49 are secured by casting in a polyurethane rubber layer 39 which protrudes from between the pole plates 49.
  • a regenerative, protective layer 23 of magnetic particles comprised in the charge With the aid of the electromagnets 50 which are connected by leads (not shown) to a power source (not shown), there is formed a regenerative, protective layer 23 of magnetic particles comprised in the charge.
  • the lifter is symmetrical so that the direction of rotation of the mill can be reversed.
  • Figs. 8 and 9 show a still further embodiment of a wall structure according to the present invention, utilized in a ball mill.
  • the lining comprises two types of standard elements, one type corresponding to the shell plates while the other type corresponds to the "lifters", even though this mill has no lifting means projecting into the interior of the mill.
  • the elements 51 corresponding to the shell plates have metal sheets 52 vulcanized thereinto on their sides facing the mill barrel 10, and the rubber part 53 of the element extends with a layer 54 over said metal sheets.
  • Permanent magnets 21 and metal inserts 20 connected to them and serving as magnet cores are vulcanized into the elements 51.
  • Protective plates 55 of non-magnetic metal material are secured to the outer sides of the permanent magnets 21 for their protection.
  • the parts 53 of the shell elements 51 which parts are formed from elastomeric material, have rib-shaped elevated portions 56 between the rows of permanent magnets to cause the layer of particles forming the protective layer 23 to curve arcuately upwards between adjacent magnets and to reduce the risks of the protective layer 23 being caused, during the initial formation thereof, to slide along the lining because of shearing forces.
  • the wall elements 57 corresponding to the lifters similarly have permanent magnets 21, metal inserts 20 and protective plates 55 which together with a metal profile bar 58 having an undercut groove 59 are vulcanized or embedded in the elastomer portion 60 of the wall elements 57.
  • the elastomer portion which may consist of polyurethane rubber, extends with a layer 61 beneath a part of the metal profile bar 58 and has a rib-shaped elevated portion 62.
  • the wall elements 57 are secured to the mill barrel 10 by means of T-bolts 46 and nuts 47, thereby clamping the barrel plates 51 in position.
  • each of the elements 51 and 57 comprises four permanent magnets and two metal inserts 20 such that the elements are relatively small and readily handled at the mounting thereof. They may of course be manufactured in optional lengths.
  • a continuous protective layer 23 of reasonably uniform thickness made up of magnetic particles in the material being ground will be retained against the lining.
  • the shell plates 51 have but two rows of permanent magnets 21, but with broader barrel plates still more rows of magnets can of course be placed beside each other.
  • Figs. 10-12 show a lining which is used in a mill and is formed from standard elements.
  • the standard elements 63 which are manufactured with the shape illustrated in Figs. 10 and 11, comprise permanent magnets 21 embedded in elastomeric material 64, preferably polyurethane rubber or some suitable plastic material, so that the elastomeric material will constitute elevated portions 65 with longitudinal V-shaped recesses 66 formed therein.
  • the elastomeric material leaves one longitudinal side of the permanent magnets free such that the magnets slightly protrude from the elastomeric material. However, the magnets can be allowed to protrude from the elastomeric material also on the opposite longitudinal side. It will be realized that in this embodiment no metal insert of magnetic material is embedded in the elastomeric material.
  • the magnetic circuit between the permanent magnets is closed by means of the metal wall, in the present instance a mill barrel, to be equipped with a wear protection means.
  • magnetism is thus utilized not only to produce the protective layer 23 of magnetic particles but also to retain the lining against its support.
  • the adaptation of the elements 63 to the arcuate shape of the mill barrel is facilitated by the recesses 66 and the bridges 67 of elastomeric material remaining beneath them, which serve as elastomer springs.
  • the standard elements 63 are of unsymmetrical shape to facilitate a correct orientation of the elements and their permanent magnets in relation to the adjacent elements.
  • Fig. 13 shows an unloading station 69 for a conveyor belt 70 which conveys particulate material containing magnetic particles, for example magnetic concentrates.
  • Fig. 13 is only schematical, and the wall elements 68 can to advantage be formed in conformity with Figs. 10 and 11, although elevated portions 65 are not necessarily required.
  • the wall elements can be formed as shown in Figs. 8 and 9.
  • the principles of the invention have been applied only to the most exposed parts of the unloading station 69 and the chute 71 beneath it, which may open above a further conveyor 72, a carriage, a bin of material, a screen or like means.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
  • Chutes (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Hard Magnetic Materials (AREA)
  • Paints Or Removers (AREA)
  • Soft Magnetic Materials (AREA)
EP80850102A 1979-07-13 1980-06-25 Wear and abrasion resistant wall structure, particularly for mills for grinding a charge comprising magnetic material Expired EP0022758B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT80850102T ATE2399T1 (de) 1979-07-13 1980-06-25 Gegen abrasion und verschleiss widerstandsfaehige auskleidung, insbesondere fuer muehlen, die magnetisches mahlgut zermahlen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE7906098A SE421868B (sv) 1979-07-13 1979-07-13 For notning utsatt vegg, vilken vid anvendning utsettes for notning av stycke- eller partikelformigt gods, som omfattar magnetiska partiklar
SE7906098 1979-07-13

Publications (2)

Publication Number Publication Date
EP0022758A1 EP0022758A1 (en) 1981-01-21
EP0022758B1 true EP0022758B1 (en) 1983-02-09

Family

ID=20338515

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80850102A Expired EP0022758B1 (en) 1979-07-13 1980-06-25 Wear and abrasion resistant wall structure, particularly for mills for grinding a charge comprising magnetic material

Country Status (20)

Country Link
EP (1) EP0022758B1 (pl)
JP (1) JPS585706B2 (pl)
AR (1) AR223538A1 (pl)
AT (1) ATE2399T1 (pl)
AU (1) AU521112B2 (pl)
BR (1) BR8004377A (pl)
CA (2) CA1218972A (pl)
DE (1) DE3061894D1 (pl)
DK (1) DK151086C (pl)
ES (1) ES493320A0 (pl)
FI (1) FI65389C (pl)
IN (1) IN154573B (pl)
MX (1) MX154535A (pl)
NO (1) NO151573C (pl)
PH (1) PH21963A (pl)
PL (1) PL123829B1 (pl)
SE (1) SE421868B (pl)
SU (1) SU1120918A3 (pl)
UA (1) UA5556A1 (pl)
ZA (1) ZA804045B (pl)

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS621904U (pl) * 1985-06-19 1987-01-08
EP0233746A3 (en) * 1986-02-10 1988-04-27 Conveyor and Transmission Supply (Propietary) Limited Mill lining
JPH0193403U (pl) * 1987-12-14 1989-06-20
LU88409A1 (fr) * 1993-09-17 1994-04-01 Magotteaux Int Elément de relevage pour broyeur rotatif et broyeur équipé de tels éléments
US6027057A (en) * 1998-05-06 2000-02-22 David Roger Miles Wear-resistant, self-replenishing magnetized grinding mill liner
CN2923026Y (zh) * 2006-06-22 2007-07-18 北京金发工贸公司 环槽型磁性衬板
AU2013202181B2 (en) * 2008-04-01 2014-07-31 Weir Minerals Australia Ltd A lifter bar assembly for a crushing mill and method of installation
EA021505B1 (ru) * 2008-04-01 2015-07-30 Уиэр Минералз Острейлиа Лтд. Лифтер в сборе для барабанной мельницы и способ его модернизации
CN106669903A (zh) * 2015-11-09 2017-05-17 北京环磨科技有限公司 一种纳米钢磁性衬板
CN109195707A (zh) * 2018-01-29 2019-01-11 北京环磨科技有限公司 一种加强保护层形成的金属磁性衬板
CN109225620A (zh) * 2018-11-06 2019-01-18 北京君致清科技有限公司 一种筒式磁选机滚筒保护方法
CN111282668A (zh) * 2018-12-09 2020-06-16 张世祺 磁屏蔽磁性衬板
CN114682346B (zh) * 2022-01-06 2023-07-04 江苏新业重工股份有限公司 一种水泥球磨机
CN114832916B (zh) * 2022-04-19 2024-10-01 玉溪大红山矿业有限公司 一种用于大型球磨机的磁性衬板
CN115364963B (zh) * 2022-09-05 2023-08-15 驻马店恒久新型耐磨材料有限公司 一种便于更换的球磨机衬板组件

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE548853C (de) * 1930-11-05 1932-04-20 Otto Buettner Einrichtung zum Feinstmahlen von Zement o. dgl.
JPS568883B2 (pl) * 1975-02-06 1981-02-26
DD137065A1 (de) * 1975-12-12 1979-08-15 Ernst Madai Vorrichtung zum zerkleinern koerniger stoffe
SU656657A1 (ru) * 1977-08-01 1979-04-15 tfs.'- • ^Ш>&^ Отражательный экран дл сверхкритических барабанных мельниц

Also Published As

Publication number Publication date
DE3061894D1 (en) 1983-03-17
DK282980A (da) 1981-01-14
DK151086C (da) 1988-03-21
ZA804045B (en) 1981-07-29
ES8105583A1 (es) 1981-06-16
FI65389C (fi) 1984-05-10
IN154573B (pl) 1984-11-10
ES493320A0 (es) 1981-06-16
CA1218972A (en) 1987-03-10
PL225619A1 (pl) 1981-03-27
AR223538A1 (es) 1981-08-31
JPS5638142A (en) 1981-04-13
SE7906098L (sv) 1981-03-10
NO151573B (no) 1985-01-21
CA1218974C (en) 1987-03-10
PL123829B1 (en) 1982-11-30
ATE2399T1 (de) 1983-03-15
DK151086B (da) 1987-11-02
PH21963A (en) 1988-04-15
FI65389B (fi) 1984-01-31
UA5556A1 (uk) 1994-12-28
NO151573C (no) 1985-05-08
EP0022758A1 (en) 1981-01-21
MX154535A (es) 1987-09-28
NO802067L (no) 1981-01-14
AU6001480A (en) 1981-01-15
JPS585706B2 (ja) 1983-02-01
SU1120918A3 (ru) 1984-10-23
FI802201A (fi) 1981-01-14
AU521112B2 (en) 1982-03-18
BR8004377A (pt) 1981-02-03
SE421868B (sv) 1982-02-08

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