CA1215681A - Vertical fall super conducting magnetic separator - Google Patents
Vertical fall super conducting magnetic separatorInfo
- Publication number
- CA1215681A CA1215681A CA000406554A CA406554A CA1215681A CA 1215681 A CA1215681 A CA 1215681A CA 000406554 A CA000406554 A CA 000406554A CA 406554 A CA406554 A CA 406554A CA 1215681 A CA1215681 A CA 1215681A
- Authority
- CA
- Canada
- Prior art keywords
- magnet
- coils
- magnetic separator
- magnetic
- coil
- 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
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C1/00—Magnetic separation
- B03C1/02—Magnetic separation acting directly on the substance being separated
- B03C1/26—Magnetic separation acting directly on the substance being separated with free falling material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C1/00—Magnetic separation
- B03C1/02—Magnetic separation acting directly on the substance being separated
- B03C1/035—Open gradient magnetic separators, i.e. separators in which the gap is unobstructed, characterised by the configuration of the gap
- B03C1/0355—Open gradient magnetic separators, i.e. separators in which the gap is unobstructed, characterised by the configuration of the gap using superconductive coils
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F6/00—Superconducting magnets; Superconducting coils
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Powder Metallurgy (AREA)
- Magnetic Resonance Imaging Apparatus (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
ABSTRACT
A magnet system for use in magnetic separation wherein the magnet is of linear shape having a coil or coils with two approximately straight parallel sections joined by curved ends, the magnet being arranged so that the side of the coils are vertical to provide a flat substantially rectangular magnetic separation zone on one or both sides.
A magnet system for use in magnetic separation wherein the magnet is of linear shape having a coil or coils with two approximately straight parallel sections joined by curved ends, the magnet being arranged so that the side of the coils are vertical to provide a flat substantially rectangular magnetic separation zone on one or both sides.
Description
5~8~
This invention relates to magnet systems for use in minerals separation and to methods of minerals separation.
The invention is particularly concerned with a separation system in which the material to be separated is allowed to fall freely past a high strength magnet. The relatively magnetic mater-tat is attracted towards the magnet and the relatively non-magnetic material continues in a relatively straight path. Splitter members may be used to separate the two streams.
Previous magnetic separators proposed by us have employed a reversed pair of superconducting circular coils to provide a high magnetic field and a high gradient of field in the separation channel. This has necessitated building annular separation channels. If the channels are of complex form for the purpose of minerals separation, the requirement to make them annular increases the complexity and expense of the channel system.
According to the present invention there is provided a magnetic separator comprising a superconducting magnet the horizon-tat field force of which exceeds the vertical force and the vertical component of the force being not greater than gravity, means for feeding a stream of ore in contact with the magnet wherein the magnet is a dipole magnet having a coil or coils with two approxi-mutely straight parallel sections joined by curved ends, the major axis of the coils) being arranged horizontally while the minor axis is arranged vertically to provide a flat, substantially feat-angular magnetic/separation zone on one or both sides, and a flat splitter plate provided in the or each zone.
The linear coils provide a high magnetic field the gradient of which can be adjusted by appropriate design and while blue - lo -it may be as high as the previously mentioned system it may be lower and thus provide a errs over a much larger volume.
Preferably two coils are provided aligned side by side arranged with one longitudinal edge of each coil above the other edge of the same coil so that its long axis is horizontal and its sides vertical in a rectangular section cryostats With such a dipole magnet of high field strength, good depth of field is achieved and a separation zone which is rectangular and flat.
US
pence a tryout separation channel may then be arranged at each side of the pair of coils. The use of a straight channel enable the position of splitter plate within the channels much more easily to be adjusted especially towards and away from the magnet(s) as compared with curved or annular plates.
More than one pair of coils may be used, one pair positioned above another pair to form the cryogenic magnet.
If required, several pairs of coils, in separate cryostats or a single cryostats can be cascaded one above the other. the coils may be energized in either the same direction or reverse directions, so as to vary the field modulus and gradient in the separation zone. however, the forces between adjacent coils should be supported by a rigid structure and if the coils are mounted in close proximity they are preferably enclosed by a single cryostats and carried on a common yoke.
Advantages of a system of this invention also include reduced stress on the supercooling arrangements, more efficient generation of magnetic field for a given mass of superconductors, and use of both sides of the coil.
the design of large-scale machines is also simplified by using a linear design. In a circular magnet, thermal contraction of the coils moves the coil in a radial direction away from the outside of the cryostats when in operation. In a linear magnet this movement is very much smaller.
To separate the minerals a vertical feed channel is used which may be of the cascade type or free fall type as pro-piously described but preferably is as described below.
So or example a mineral of susceptibility 10 5 cogs units per unit maze in a field times gradient product of 50 x 10 assay cm 1 the force due to the magnetic field it half that of gravity.
If the ore is fed as a stream down a vertical wall -the magnetic Iris will retain all magnetic mineral against the wall. Friction against the wall then reduces the falling velocity and ore separation take place in this condition. It is a preferred feature of the invention that the wall should be 90 configured a to cause the material retained against or adjacent the wall, and especially the non-magnetic fraction, to be diverted horizontally away from the magnet and the wall. In an advantageous configuration the wall is arranged to have at least one, and if space permits, preferably several, humps or ridges to give the mineral momentum away from the magnet. Substantially non-magnetic mineral is diverted away from the rest of the stream while the magnetic mineral follow the surface of the wall the relatively non-magnetic mineral it collected by a splitter set below each ridge and thereby separated from the remaining mineral.
the invention will now be further described by way of example with reference to the accompanying drawings in which:
figure 1 is a sketch side elevation of a linear magnet coil illustrating the shape thereof, figure 2 is a section of the coil of figure 1, figure 3 is a more detailed section of a pair of coils, and Figure 4 is a sketch of a portion of a magnetic separator in accordance with the invention adjacent the magnet.
Referring to the drawings, each cryo~erlic magrlet coil :~' Jo lZ~S~
consists of two approximately straight parallel winding sections 10, typically 2 mutters long with end 12 of approximately semi-circular shape (Figure 1). m e separation of the straight sections will be typically 50 to 150 mm and the cross-section 25 x 40 mm.
In use two linear coils 10, 10' such as are shown in Figures i and 2 are placed back to back with their long sides horizontal and their sides vertical as can be teen in Figure 3.
The two coils are separated by a distance of about 5 to 10 mm.
To sustain the forces between the straight section, a yoke 14 of glass fire reinforced material or metal is provided. The yoke it placed between the two identical coil windings so as to provide the highest field at each flat surface 15, 15' of the cryostats instead of surrounding a single oil.
surer insulation and radiation screens I are provided between the coils and the sides of the cryostats The walls 15 are held spaced apart by a support member 20 and -the top and bottom of the member is closed by caps 22. The magnet is employed with a conventional refrigeration system to provide supercooled super-conducting coils.
20 . The field from such a linear dipole magnet as it shown in figure extends out on either side, and a separation channel s can be placed on each idea of the magnet member.
The magnet member as illustrated in Figure 3 is employed in a magnetic separator as shown generally in Figure 4 which it only of the right hand side. The left hand side it similar.
The material to be separated is fed from a hopper I through an adjustable choke 23 feed to fall adjacent the wall surface 15 1~L56~
of the magnet in a stream about 10 mm think.
the magnetic force is adjusted, depending on the ore to be separated so that the ore 25 falls down the side of the magnet under the influence of gravity the magnetic portion of the ore being 5 drawn toward the magnet and held against the wall. this tends to reduce the falling velocity anathe separation achieved. Hence a smooth bump 24 (or its equivalent) is provided on the wall 16 which causes the ore falling against or adjacent the wall and especially the non-magnetic fraction, to be diverted horizontally 10 away from the wall.
Substantially non-magnetic mineral it diverted away from the magnetic mineral which tends to be retracted by the magnet back towards the wall surface 15.
Several bumps may be provided below each other. the 15 concept of using gush bumps forms the subject of our co-pending B application Jo. Yost , filed simultaneously herewith.
Finally the relatively magnetic material falls adjacent the magnet and the relatively non-magnetic material away from the magnet, the two streams M and NM being separated by an adjustable 20 flat splitter member 26, whose position can readily be adjusted towards or away from the wall surface 15. Typically, the-stream of ore is 3 to 6 mm in thickness and the ridge or bump 24 projects 4 - 10 mums from the wall surface 15. It is I;
desirable that the shape is smooth on the upper side so as to 25 avoid remixing of the mineral. sharp step causes mineral to be bounced at random and this may cause a degradation in the quality of separation.
I
The materials are reseparated at each successive ridge or bump.
The feed channel can, if desired, be divided into a horizontal series of thin vertical channels, e.g. each 20 mm --wide, each receivillg a stream of crushed ore to be separated, instead of one broad charnel, given that the magnetic field is of sufficient extent (say 100 mm) to encompass all the channels.
For example if a second channel is used on both sides, this will be positioned outwardly of the channel S as shown on one side at So in Figure 4, where the magnetic field is weaker. Channel So is bounded on the magnet side by a wall 16i provided with a ridge or bump 24' similar to that shown at 24. A first pass of the material may be made through this second channel S' and then a final or second pass through the first channel S adjacent the magnet where the field is stronger.
As an example of the separation achieved tests were made - on phosphate mineral containing about 14~ appetite mineral and analyzing as 5.8% P205~ In a separation at a modest magnetic field of 24,000 gauss at a flow rate of 9 ton/hour per moire of magnet length ore was passed over two bumps of 10 mm projection from the magnet face. The ore had a free fall of 100 mm from the linear hopper during which fall it was held against the face of the channel adjacent to the magnet by the magnetic field. Below each bump the ore was split into magnetic and non-magnetic fractions.
-,, I, :.
~2~5~
The magnetic from the first bump were passed over the second bump the two non-magnetic fractions were combined for retreatment at a higher field. m e splitter below each bump was positioned 30 mm away from the magnet 'ace and 70 mm below the center of the bump. The non-magnetic product was 36% of the mass. The magnetic product was discarded as waste mineral. The recovery of appetite was 77~ in the non-magnetic product. m is product was then retreated at a higher field of 31,000 gauss.
Again the mineral was passed over two bumps of 10 mm projection after a 100 mm free fall. The splitter was set at 20 mm from the magnet wall and 70 mm below the bump. 'Lye non-magnetic product from the first bump analyzed at 38.3% P205 or 90.3% phosphate. Magnetic measurement of the susceptibility indicated 93% phosphate. m e non-magnetic product from the second bump represented 32.4% P205 or 76% appetite. m e recovery of this second double stage of separation was 78%.
The final product is of sufficient commercial grade.
, ' .
This invention relates to magnet systems for use in minerals separation and to methods of minerals separation.
The invention is particularly concerned with a separation system in which the material to be separated is allowed to fall freely past a high strength magnet. The relatively magnetic mater-tat is attracted towards the magnet and the relatively non-magnetic material continues in a relatively straight path. Splitter members may be used to separate the two streams.
Previous magnetic separators proposed by us have employed a reversed pair of superconducting circular coils to provide a high magnetic field and a high gradient of field in the separation channel. This has necessitated building annular separation channels. If the channels are of complex form for the purpose of minerals separation, the requirement to make them annular increases the complexity and expense of the channel system.
According to the present invention there is provided a magnetic separator comprising a superconducting magnet the horizon-tat field force of which exceeds the vertical force and the vertical component of the force being not greater than gravity, means for feeding a stream of ore in contact with the magnet wherein the magnet is a dipole magnet having a coil or coils with two approxi-mutely straight parallel sections joined by curved ends, the major axis of the coils) being arranged horizontally while the minor axis is arranged vertically to provide a flat, substantially feat-angular magnetic/separation zone on one or both sides, and a flat splitter plate provided in the or each zone.
The linear coils provide a high magnetic field the gradient of which can be adjusted by appropriate design and while blue - lo -it may be as high as the previously mentioned system it may be lower and thus provide a errs over a much larger volume.
Preferably two coils are provided aligned side by side arranged with one longitudinal edge of each coil above the other edge of the same coil so that its long axis is horizontal and its sides vertical in a rectangular section cryostats With such a dipole magnet of high field strength, good depth of field is achieved and a separation zone which is rectangular and flat.
US
pence a tryout separation channel may then be arranged at each side of the pair of coils. The use of a straight channel enable the position of splitter plate within the channels much more easily to be adjusted especially towards and away from the magnet(s) as compared with curved or annular plates.
More than one pair of coils may be used, one pair positioned above another pair to form the cryogenic magnet.
If required, several pairs of coils, in separate cryostats or a single cryostats can be cascaded one above the other. the coils may be energized in either the same direction or reverse directions, so as to vary the field modulus and gradient in the separation zone. however, the forces between adjacent coils should be supported by a rigid structure and if the coils are mounted in close proximity they are preferably enclosed by a single cryostats and carried on a common yoke.
Advantages of a system of this invention also include reduced stress on the supercooling arrangements, more efficient generation of magnetic field for a given mass of superconductors, and use of both sides of the coil.
the design of large-scale machines is also simplified by using a linear design. In a circular magnet, thermal contraction of the coils moves the coil in a radial direction away from the outside of the cryostats when in operation. In a linear magnet this movement is very much smaller.
To separate the minerals a vertical feed channel is used which may be of the cascade type or free fall type as pro-piously described but preferably is as described below.
So or example a mineral of susceptibility 10 5 cogs units per unit maze in a field times gradient product of 50 x 10 assay cm 1 the force due to the magnetic field it half that of gravity.
If the ore is fed as a stream down a vertical wall -the magnetic Iris will retain all magnetic mineral against the wall. Friction against the wall then reduces the falling velocity and ore separation take place in this condition. It is a preferred feature of the invention that the wall should be 90 configured a to cause the material retained against or adjacent the wall, and especially the non-magnetic fraction, to be diverted horizontally away from the magnet and the wall. In an advantageous configuration the wall is arranged to have at least one, and if space permits, preferably several, humps or ridges to give the mineral momentum away from the magnet. Substantially non-magnetic mineral is diverted away from the rest of the stream while the magnetic mineral follow the surface of the wall the relatively non-magnetic mineral it collected by a splitter set below each ridge and thereby separated from the remaining mineral.
the invention will now be further described by way of example with reference to the accompanying drawings in which:
figure 1 is a sketch side elevation of a linear magnet coil illustrating the shape thereof, figure 2 is a section of the coil of figure 1, figure 3 is a more detailed section of a pair of coils, and Figure 4 is a sketch of a portion of a magnetic separator in accordance with the invention adjacent the magnet.
Referring to the drawings, each cryo~erlic magrlet coil :~' Jo lZ~S~
consists of two approximately straight parallel winding sections 10, typically 2 mutters long with end 12 of approximately semi-circular shape (Figure 1). m e separation of the straight sections will be typically 50 to 150 mm and the cross-section 25 x 40 mm.
In use two linear coils 10, 10' such as are shown in Figures i and 2 are placed back to back with their long sides horizontal and their sides vertical as can be teen in Figure 3.
The two coils are separated by a distance of about 5 to 10 mm.
To sustain the forces between the straight section, a yoke 14 of glass fire reinforced material or metal is provided. The yoke it placed between the two identical coil windings so as to provide the highest field at each flat surface 15, 15' of the cryostats instead of surrounding a single oil.
surer insulation and radiation screens I are provided between the coils and the sides of the cryostats The walls 15 are held spaced apart by a support member 20 and -the top and bottom of the member is closed by caps 22. The magnet is employed with a conventional refrigeration system to provide supercooled super-conducting coils.
20 . The field from such a linear dipole magnet as it shown in figure extends out on either side, and a separation channel s can be placed on each idea of the magnet member.
The magnet member as illustrated in Figure 3 is employed in a magnetic separator as shown generally in Figure 4 which it only of the right hand side. The left hand side it similar.
The material to be separated is fed from a hopper I through an adjustable choke 23 feed to fall adjacent the wall surface 15 1~L56~
of the magnet in a stream about 10 mm think.
the magnetic force is adjusted, depending on the ore to be separated so that the ore 25 falls down the side of the magnet under the influence of gravity the magnetic portion of the ore being 5 drawn toward the magnet and held against the wall. this tends to reduce the falling velocity anathe separation achieved. Hence a smooth bump 24 (or its equivalent) is provided on the wall 16 which causes the ore falling against or adjacent the wall and especially the non-magnetic fraction, to be diverted horizontally 10 away from the wall.
Substantially non-magnetic mineral it diverted away from the magnetic mineral which tends to be retracted by the magnet back towards the wall surface 15.
Several bumps may be provided below each other. the 15 concept of using gush bumps forms the subject of our co-pending B application Jo. Yost , filed simultaneously herewith.
Finally the relatively magnetic material falls adjacent the magnet and the relatively non-magnetic material away from the magnet, the two streams M and NM being separated by an adjustable 20 flat splitter member 26, whose position can readily be adjusted towards or away from the wall surface 15. Typically, the-stream of ore is 3 to 6 mm in thickness and the ridge or bump 24 projects 4 - 10 mums from the wall surface 15. It is I;
desirable that the shape is smooth on the upper side so as to 25 avoid remixing of the mineral. sharp step causes mineral to be bounced at random and this may cause a degradation in the quality of separation.
I
The materials are reseparated at each successive ridge or bump.
The feed channel can, if desired, be divided into a horizontal series of thin vertical channels, e.g. each 20 mm --wide, each receivillg a stream of crushed ore to be separated, instead of one broad charnel, given that the magnetic field is of sufficient extent (say 100 mm) to encompass all the channels.
For example if a second channel is used on both sides, this will be positioned outwardly of the channel S as shown on one side at So in Figure 4, where the magnetic field is weaker. Channel So is bounded on the magnet side by a wall 16i provided with a ridge or bump 24' similar to that shown at 24. A first pass of the material may be made through this second channel S' and then a final or second pass through the first channel S adjacent the magnet where the field is stronger.
As an example of the separation achieved tests were made - on phosphate mineral containing about 14~ appetite mineral and analyzing as 5.8% P205~ In a separation at a modest magnetic field of 24,000 gauss at a flow rate of 9 ton/hour per moire of magnet length ore was passed over two bumps of 10 mm projection from the magnet face. The ore had a free fall of 100 mm from the linear hopper during which fall it was held against the face of the channel adjacent to the magnet by the magnetic field. Below each bump the ore was split into magnetic and non-magnetic fractions.
-,, I, :.
~2~5~
The magnetic from the first bump were passed over the second bump the two non-magnetic fractions were combined for retreatment at a higher field. m e splitter below each bump was positioned 30 mm away from the magnet 'ace and 70 mm below the center of the bump. The non-magnetic product was 36% of the mass. The magnetic product was discarded as waste mineral. The recovery of appetite was 77~ in the non-magnetic product. m is product was then retreated at a higher field of 31,000 gauss.
Again the mineral was passed over two bumps of 10 mm projection after a 100 mm free fall. The splitter was set at 20 mm from the magnet wall and 70 mm below the bump. 'Lye non-magnetic product from the first bump analyzed at 38.3% P205 or 90.3% phosphate. Magnetic measurement of the susceptibility indicated 93% phosphate. m e non-magnetic product from the second bump represented 32.4% P205 or 76% appetite. m e recovery of this second double stage of separation was 78%.
The final product is of sufficient commercial grade.
, ' .
Claims (6)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A magnetic separator comprising a superconducting magnet the horizontal field force of which exceeds the vertical force and the vertical component of the force being not greater than gravity, means for feeding a stream of ore in contact with the magnet where-in the magnet is a dipole magnet having a coil or coils with two approximately straight parallel sections joined by curved ends, the major axis of the coil(s) being arranged horizontally while the minor axis is arranged vertically to provide a flat, substantially rectangular magnetic/separation zone on one or both sides, and a flat splitter plate provided in the or each zone
2. A magnetic separator as claimed in Claim 1 in which the magnet has two coils aligned side by side.
3. A magnetic separator as claimed in Claim 1 wherein a yoke is provided to hold the straight section of the coil(s) straight against the self force of the coils.
4. A magnetic separator as claimed in Claim 1 in which the magnet has two coils aligned side by side, wherein a yoke is pro-voided to hold the straight section of the coil(s) straight against the self force of the coils and in which the yoke is located between the coils of the pair.
5. A magnetic separator as claimed in Claim 3 or 4 in which the coils are enclosed in a cryostats the flat walls of which are held apart by a support and which form one side of a separation channel.
6. A magnetic separator as claimed in on one of the claims 1 to 3 in which at or adjacent the inner wall of a separation channel is a means to cause the particles to move out away from the magnet.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8120865 | 1981-07-06 | ||
| GB8120865 | 1981-07-06 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1215681A true CA1215681A (en) | 1986-12-23 |
Family
ID=10523058
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000406554A Expired CA1215681A (en) | 1981-07-06 | 1982-07-05 | Vertical fall super conducting magnetic separator |
| CA000406541A Expired CA1223229A (en) | 1981-07-06 | 1982-07-05 | Streamed magnetic particle separator with stationary- magnet mounted bumps or ridges |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000406541A Expired CA1223229A (en) | 1981-07-06 | 1982-07-05 | Streamed magnetic particle separator with stationary- magnet mounted bumps or ridges |
Country Status (6)
| Country | Link |
|---|---|
| AU (2) | AU558672B2 (en) |
| CA (2) | CA1215681A (en) |
| DE (1) | DE3225647A1 (en) |
| FI (1) | FI822383L (en) |
| SE (1) | SE8204168L (en) |
| ZA (2) | ZA824795B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102007010130B4 (en) * | 2007-02-28 | 2009-12-31 | Siemens Ag | Method and arrangement for separating magnetic particles from a substance |
-
1982
- 1982-07-05 FI FI822383A patent/FI822383L/en not_active Application Discontinuation
- 1982-07-05 AU AU85620/82A patent/AU558672B2/en not_active Ceased
- 1982-07-05 CA CA000406554A patent/CA1215681A/en not_active Expired
- 1982-07-05 CA CA000406541A patent/CA1223229A/en not_active Expired
- 1982-07-05 AU AU85621/82A patent/AU559130B2/en not_active Ceased
- 1982-07-06 DE DE19823225647 patent/DE3225647A1/en not_active Withdrawn
- 1982-07-06 ZA ZA824795A patent/ZA824795B/en unknown
- 1982-07-06 SE SE8204168A patent/SE8204168L/en not_active Application Discontinuation
- 1982-07-06 ZA ZA824796A patent/ZA824796B/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| SE8204168D0 (en) | 1982-07-06 |
| AU559130B2 (en) | 1987-02-26 |
| FI822383L (en) | 1983-01-07 |
| ZA824796B (en) | 1983-04-27 |
| FI822383A0 (en) | 1982-07-05 |
| AU558672B2 (en) | 1987-02-05 |
| AU8562082A (en) | 1983-01-13 |
| DE3225647A1 (en) | 1983-01-20 |
| AU8562182A (en) | 1983-01-13 |
| ZA824795B (en) | 1984-03-28 |
| SE8204168L (en) | 1983-01-07 |
| CA1223229A (en) | 1987-06-23 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |