CA1053612A - Density and magnetic separations - Google Patents
Density and magnetic separationsInfo
- Publication number
- CA1053612A CA1053612A CA258,599A CA258599A CA1053612A CA 1053612 A CA1053612 A CA 1053612A CA 258599 A CA258599 A CA 258599A CA 1053612 A CA1053612 A CA 1053612A
- Authority
- CA
- Canada
- Prior art keywords
- particles
- dense medium
- dense
- fraction
- separation
- 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
- B03C5/00—Separating dispersed particles from liquids by electrostatic effect
-
- 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
- B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- B03B5/00—Washing granular, powdered or lumpy materials; Wet separating
- B03B5/28—Washing granular, powdered or lumpy materials; Wet separating by sink-float separation
- B03B5/30—Washing granular, powdered or lumpy materials; Wet separating by sink-float separation using heavy liquids or suspensions
- B03B5/32—Washing granular, powdered or lumpy materials; Wet separating by sink-float separation using heavy liquids or suspensions using centrifugal force
- B03B5/34—Applications of hydrocyclones
-
- 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
- B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- B03B5/00—Washing granular, powdered or lumpy materials; Wet separating
- B03B5/28—Washing granular, powdered or lumpy materials; Wet separating by sink-float separation
- B03B5/30—Washing granular, powdered or lumpy materials; Wet separating by sink-float separation using heavy liquids or suspensions
- B03B5/44—Application of particular media therefor
- B03B5/447—Application of particular media therefor recovery of heavy media
-
- 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
- B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- B03B9/00—General arrangement of separating plant, e.g. flow sheets
- B03B9/005—General arrangement of separating plant, e.g. flow sheets specially adapted for coal
Landscapes
- Separation Of Solids By Using Liquids Or Pneumatic Power (AREA)
Abstract
ABSTRACT OF DISCLOSURE
A method for recovering magnetic dense medium particles from a suspension containing these particles and other less dense particles includes the steps of subjecting the suspension to at least a single stage high relative density separation to form a first fraction containing substantially only dense medium particles and a second fraction containing the bulk of the other particles and some dense medium particles, and subjecting the second fraction to a magnetic separation for recovery of the remaining dense medium particles. Each stage of the high relative density separation is effected in a cyclone. The suspension may be the overflow or the underflow from a dense medium process for the beneficiation of coal fines.
A method for recovering magnetic dense medium particles from a suspension containing these particles and other less dense particles includes the steps of subjecting the suspension to at least a single stage high relative density separation to form a first fraction containing substantially only dense medium particles and a second fraction containing the bulk of the other particles and some dense medium particles, and subjecting the second fraction to a magnetic separation for recovery of the remaining dense medium particles. Each stage of the high relative density separation is effected in a cyclone. The suspension may be the overflow or the underflow from a dense medium process for the beneficiation of coal fines.
Description
THIS invention relates to dense medium separation wherein magnetic particles are used to form the dense medium.
- Dense medium separation is a well known technique -for separating particulate solids of different densities in a mixture. The dense medium is a suspension of dense particles in a liquid. The mixture of particles for separation is mixed with the suspension, and the different particles allowed to sink or float. The operation may for example be effected in a cyclone.
When coarse particles are involved there is little problem in separating the particles in the underflow and overflow from the dense medium by simple screening.
When dense medium separation is used for particles over 1000~, the greater part of the medium may be recovered for immediate re-use by screening alone. The magnetite particles adhering to the washed products may be rinsed - off and the diluted magnetite suspension so created cleaned and concentrated in magnetic separators.
. .
, When attempting to wash particulate material nominally less than 1000~, efficient separation of the cleaned particles from the medium is not so readily effected by simple screening. Moreover, because of the large surface area of the cleaned particles, adherence of magnetite is a severe problem. Consequently, in ~` 25 washin~ plants attempting to clean -1000~ particles, 1 it has been proposed that the entire separation of the ,` cleaned products from the medium be carried out by magnetic separation.
I For acceptable recovery of the dense medium however ¦ 30 large separation areas and cons;derable dilution of ~ the suspensions is required. This is a costly step.
.
., .. . . , ~ . . . . . .
;. . . . . . - - ~ . .
.. ' ` .' ~ . -. ''. ' .. :., . ' .. ;. . : .
lQ53~;1Z
According to the present invention there is provided a process wherein a particulate material is separated by means of a dense medium suspension made up of magnetic particles into high and low density fractions and the dense medium is recovered from the fractions by screening and washing to yield a first product recovered from the high density fraction and a second product recovered from the low density fraction, with the improvement that at least one of the products is subjected to a hydrocyclone separation to yield a dense fraction containing substantially only dense medium particles and a light fraction containing substantially all of the other particles and some dense medium particles and recovering the dense medium particles from the light fraction by means of a magnetic separation, the dense fraction and the recovered dense medium particles being utilized to make up the dense medium suspension.
According to the present invention there is also provided a process wherein raw coal fines is separated by means of a dense medium suspension made up of magnetic particles into high and low density fractions, and the dense medium is recovered from the fractions by screening and washing to yield a first product recovered from the high density fraction and a second product recovered from the low density fraction, with the improvement that at least one of the products is subjected to a hydrocyclone separation to yield a dense fraction containing substantially only dense medium particles and a light fraction containing substantially all of the coal derived particles and some dense medium particles and eecovering the dense medium particles from the light fraction by means of a magnetic separation, the dense fraction and the reoovered dense medium particles being utilized to make up the dense medium suspension.
~ The density separation may be effected in one, two or even more b~ stages.
- In the case of more than one stage, the feed to each subsequent stage is preferably dewatered.
1$ 3 : . ~ , - . . , :
lV53ti1Z
Each stage of the high relative density separation may be effected in a cyclone.
According to this embodiment a wide angle cyclone, i.e. a cyclone the cone angle of which is in the range 60 to 180 is preferred.
The method of the invention may be used in the separation of fine coal particles from a dense medium wherein the dense particles are magnetite.
For example, it may be used to treat the overflow from a dense medium process for the beneficiation of coal fines.
In this case the method may also be used to treat the underflow, 10 i.c. to separate thc s~gnotite particles frols the discard particles.
.1 . .
Z
~ - 3a _ ., !
- : . : , , 1053f~12 The invention is discussed further with reference to the attache~ flow sheet of a plant intended to beneficiate coal fines.
Referring to the flow sheet, raw coal fines for S beneficiation are mixed with an aqueous suspension of magnetite in a tank 2. The mixture is fed to a cyclone 4 for a conventional dense medium beneficiation of the coal fines. The underflow from the cyclone 4 comprises a suspension of discard and magnetite particles, and the overflow a mixture of washed coal fines and magnetite particles. Both the underflow and overflow are subjected to further similar treatment for separation of the magnetite particles from the other less dense particles (coal or discard) present therein as follows:
The underflow from the cyclone 4 is fed to a screening ' stage 6 for removal of any coarse discard fractions ,~ (i.e. exceeding a predetermined size,say 1000~). The j overflow from the screening stage 6 comprising the coarse discard fraction is led away, and the underflow is fed to a first cyclone 8.1. The overflow from the cyclone 8.1 is fed to a dewatering stage 10 and then to ~ a second cyclGne 8.2. The screening stage 6 includes i a rinsing portion 6.1 which is fed with water from the I 25 dewatering stage 10. The underflow from the rinsing ¦ portion 6.1 is added to the overflow from the cyclone ~ 8.1 before ;t enters the dewatering stage 10. The under-¦ flow from each cyclone 8.1,8.2 is adjusted to form a i first fraction containing essentially only magnetite particles. This fraction is recycled to the tank 2 via an overdense tank 14 and load box 16. The overflow ~ from the second cyclone 8.2 forms a second fraction ¦ containing the bulk of the discard particles and some I _ 4 ;.. -- , .. .. . . ..... . .
.; . .. . .. . . . .
:' . ', : . . : : : :
1053~;12 dence medium particles. This second fraction is fed to a magnetic separator 12 for recovery of the remaining magnetite particles. The magretite recovered is recycled from the magnetic separator 12 to the tank 2 via the overdense tank 14 and load box 16. The fine discard is led away.
The overflow from the cyclone 4 is ~reated similarly.
It is fed to a screening stage 18 for removal of any coarse coal fractions (i.e. exceeding a predetermined size, say 1000~). The overflow from the screening stage 18 comprising the coarse coal fractions is led away, and the underflow is fed to a first cyclone 20.1. The overflow from this cyclone 20.1 is fed to a dewatering stage 22 and then to a second cyclone 20.2. The screening stage 18 includes a rinsing portion 18.1 which is fed with water from the dewatering stage 22. The underflow from the rin~ing portion 18.1 is added to the overflow from the cyclone 20.1 before it enters the dewatering stage 22. The underflows from the cyclones 20.1 and 20.2 containing substantially magnetite particles ~, only, are recycled to the tank 2 via the overdense tank14 and load box 16. The overflow from the cyclone 20.2 contains the bulk of the coal particles and some l magnetite particles. It is fed to a magnetic separator ¦ 25 12 for recovery of the magnetite particles. The 3 recovered magnetite is recycled to the tank 2 via the overdense tank 14 and load box 16, and the cleaned coal fines are led away.
.~ . .
The cyclones 8.1, 8.2, 20.1 and 20.2 are all wide angle cyclones, i.e. having a cone angle in the range 60-, 180.
`3i :- . , . ,.... - , . . , , ~ ...
, . , . -, . . . , .... : .: , , . .- .. .
: ' ~ ~ ,' , ` ,, 1053~12 The magnetite particles used for forming the dense medium are of conventional size for such processes, not exceeding 100 microns.
The coal fines to which the process is particularly applicable are those having a particle size not exceeding of the order of 1000 microns, in particular those in which the majority have a particle size less than 300 microns. Particles of this-order of size being recalcitrant to separation techniques such as froth flotation, require dense medium separation, and accordingly : magnetic separation of the magnetite particles from the coal and discard particles in the overflow and underflow respectively.
... .
In a number of tests a substantially pure underflow (i.e. containing little contaminating coal) was obtained - when aqueous suspensions of coal particles and magnetite particles of the order of the above sizes were fed to cyclones having cone angles of 160 and 180.
Preceding magnetic separation treatment of the underflow and overflow from the dense medium beneficiation with high specific gravity separations has the advantage that the loads on the magnetic separators are significantly reduced. Thus smaller capacity, and accordingly less expensive, magnetic separators may be used.
., .
~, .
.
.
' '. ~ .'' ', - . ~ .
.
. - . . - .:
- Dense medium separation is a well known technique -for separating particulate solids of different densities in a mixture. The dense medium is a suspension of dense particles in a liquid. The mixture of particles for separation is mixed with the suspension, and the different particles allowed to sink or float. The operation may for example be effected in a cyclone.
When coarse particles are involved there is little problem in separating the particles in the underflow and overflow from the dense medium by simple screening.
When dense medium separation is used for particles over 1000~, the greater part of the medium may be recovered for immediate re-use by screening alone. The magnetite particles adhering to the washed products may be rinsed - off and the diluted magnetite suspension so created cleaned and concentrated in magnetic separators.
. .
, When attempting to wash particulate material nominally less than 1000~, efficient separation of the cleaned particles from the medium is not so readily effected by simple screening. Moreover, because of the large surface area of the cleaned particles, adherence of magnetite is a severe problem. Consequently, in ~` 25 washin~ plants attempting to clean -1000~ particles, 1 it has been proposed that the entire separation of the ,` cleaned products from the medium be carried out by magnetic separation.
I For acceptable recovery of the dense medium however ¦ 30 large separation areas and cons;derable dilution of ~ the suspensions is required. This is a costly step.
.
., .. . . , ~ . . . . . .
;. . . . . . - - ~ . .
.. ' ` .' ~ . -. ''. ' .. :., . ' .. ;. . : .
lQ53~;1Z
According to the present invention there is provided a process wherein a particulate material is separated by means of a dense medium suspension made up of magnetic particles into high and low density fractions and the dense medium is recovered from the fractions by screening and washing to yield a first product recovered from the high density fraction and a second product recovered from the low density fraction, with the improvement that at least one of the products is subjected to a hydrocyclone separation to yield a dense fraction containing substantially only dense medium particles and a light fraction containing substantially all of the other particles and some dense medium particles and recovering the dense medium particles from the light fraction by means of a magnetic separation, the dense fraction and the recovered dense medium particles being utilized to make up the dense medium suspension.
According to the present invention there is also provided a process wherein raw coal fines is separated by means of a dense medium suspension made up of magnetic particles into high and low density fractions, and the dense medium is recovered from the fractions by screening and washing to yield a first product recovered from the high density fraction and a second product recovered from the low density fraction, with the improvement that at least one of the products is subjected to a hydrocyclone separation to yield a dense fraction containing substantially only dense medium particles and a light fraction containing substantially all of the coal derived particles and some dense medium particles and eecovering the dense medium particles from the light fraction by means of a magnetic separation, the dense fraction and the reoovered dense medium particles being utilized to make up the dense medium suspension.
~ The density separation may be effected in one, two or even more b~ stages.
- In the case of more than one stage, the feed to each subsequent stage is preferably dewatered.
1$ 3 : . ~ , - . . , :
lV53ti1Z
Each stage of the high relative density separation may be effected in a cyclone.
According to this embodiment a wide angle cyclone, i.e. a cyclone the cone angle of which is in the range 60 to 180 is preferred.
The method of the invention may be used in the separation of fine coal particles from a dense medium wherein the dense particles are magnetite.
For example, it may be used to treat the overflow from a dense medium process for the beneficiation of coal fines.
In this case the method may also be used to treat the underflow, 10 i.c. to separate thc s~gnotite particles frols the discard particles.
.1 . .
Z
~ - 3a _ ., !
- : . : , , 1053f~12 The invention is discussed further with reference to the attache~ flow sheet of a plant intended to beneficiate coal fines.
Referring to the flow sheet, raw coal fines for S beneficiation are mixed with an aqueous suspension of magnetite in a tank 2. The mixture is fed to a cyclone 4 for a conventional dense medium beneficiation of the coal fines. The underflow from the cyclone 4 comprises a suspension of discard and magnetite particles, and the overflow a mixture of washed coal fines and magnetite particles. Both the underflow and overflow are subjected to further similar treatment for separation of the magnetite particles from the other less dense particles (coal or discard) present therein as follows:
The underflow from the cyclone 4 is fed to a screening ' stage 6 for removal of any coarse discard fractions ,~ (i.e. exceeding a predetermined size,say 1000~). The j overflow from the screening stage 6 comprising the coarse discard fraction is led away, and the underflow is fed to a first cyclone 8.1. The overflow from the cyclone 8.1 is fed to a dewatering stage 10 and then to ~ a second cyclGne 8.2. The screening stage 6 includes i a rinsing portion 6.1 which is fed with water from the I 25 dewatering stage 10. The underflow from the rinsing ¦ portion 6.1 is added to the overflow from the cyclone ~ 8.1 before ;t enters the dewatering stage 10. The under-¦ flow from each cyclone 8.1,8.2 is adjusted to form a i first fraction containing essentially only magnetite particles. This fraction is recycled to the tank 2 via an overdense tank 14 and load box 16. The overflow ~ from the second cyclone 8.2 forms a second fraction ¦ containing the bulk of the discard particles and some I _ 4 ;.. -- , .. .. . . ..... . .
.; . .. . .. . . . .
:' . ', : . . : : : :
1053~;12 dence medium particles. This second fraction is fed to a magnetic separator 12 for recovery of the remaining magnetite particles. The magretite recovered is recycled from the magnetic separator 12 to the tank 2 via the overdense tank 14 and load box 16. The fine discard is led away.
The overflow from the cyclone 4 is ~reated similarly.
It is fed to a screening stage 18 for removal of any coarse coal fractions (i.e. exceeding a predetermined size, say 1000~). The overflow from the screening stage 18 comprising the coarse coal fractions is led away, and the underflow is fed to a first cyclone 20.1. The overflow from this cyclone 20.1 is fed to a dewatering stage 22 and then to a second cyclone 20.2. The screening stage 18 includes a rinsing portion 18.1 which is fed with water from the dewatering stage 22. The underflow from the rin~ing portion 18.1 is added to the overflow from the cyclone 20.1 before it enters the dewatering stage 22. The underflows from the cyclones 20.1 and 20.2 containing substantially magnetite particles ~, only, are recycled to the tank 2 via the overdense tank14 and load box 16. The overflow from the cyclone 20.2 contains the bulk of the coal particles and some l magnetite particles. It is fed to a magnetic separator ¦ 25 12 for recovery of the magnetite particles. The 3 recovered magnetite is recycled to the tank 2 via the overdense tank 14 and load box 16, and the cleaned coal fines are led away.
.~ . .
The cyclones 8.1, 8.2, 20.1 and 20.2 are all wide angle cyclones, i.e. having a cone angle in the range 60-, 180.
`3i :- . , . ,.... - , . . , , ~ ...
, . , . -, . . . , .... : .: , , . .- .. .
: ' ~ ~ ,' , ` ,, 1053~12 The magnetite particles used for forming the dense medium are of conventional size for such processes, not exceeding 100 microns.
The coal fines to which the process is particularly applicable are those having a particle size not exceeding of the order of 1000 microns, in particular those in which the majority have a particle size less than 300 microns. Particles of this-order of size being recalcitrant to separation techniques such as froth flotation, require dense medium separation, and accordingly : magnetic separation of the magnetite particles from the coal and discard particles in the overflow and underflow respectively.
... .
In a number of tests a substantially pure underflow (i.e. containing little contaminating coal) was obtained - when aqueous suspensions of coal particles and magnetite particles of the order of the above sizes were fed to cyclones having cone angles of 160 and 180.
Preceding magnetic separation treatment of the underflow and overflow from the dense medium beneficiation with high specific gravity separations has the advantage that the loads on the magnetic separators are significantly reduced. Thus smaller capacity, and accordingly less expensive, magnetic separators may be used.
., .
~, .
.
.
' '. ~ .'' ', - . ~ .
.
. - . . - .:
Claims (7)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A process wherein a particulate material is separated by means of a dense medium suspension made up of magnetic particles into high and low density fractions and the dense medium is recovered from the fractions by screening and washing to yield a first product recovered from the high density fraction and a second product recovered from the low density fraction, with the improvement that at least one of the products is subjected to a hydrocyclone separation to yield a dense fraction containing substantially only dense medium particles and a light fraction containing substantially all of the other particles and some dense medium particles and recovering the dense medium particles from the light fraction by means of a magnetic separation, the dense fraction and the recovered dense medium particles being utilized to make up the dense medium suspension.
2. A process wherein raw coal fines is separated by means of a dense medium suspension made up of magnetic particles into high and low density fractions, and the dense medium is recovered from the fractions by screening and washing to yield a first product recovered from the high density fraction and a second product recovered from the low density fraction, with the improvement that at least one of the products is subjected to a hydrocyclone separation to yield a dense fraction containing substantially only dense medium particles and a light fraction containing substantially all of the coal derived particles and some dense medium particles and recovering the dense medium particles from the light fraction by means of a magnetic separation, the dense fraction and the recovered dense medium particles being utilized to make up the dense medium suspension.
3. A process according to claim 1 in which the hydrocyclone separation is a two stage one.
4. A process according to claim 3 in which the underflow from the first stage is dewatered before being fed to the second stage.
5. A process according to claim 1 in which the hydrocyclone has a cone angle in the range 60 degrees to 180 degrees.
6. A process according to claim 1 in which both products are separately subjected to a hydrocyclone separation to yield a dense and a light fraction.
7. In a process wherein a particulate material is separated into high and low density fractions by means of a dense medium suspension made up of magnetic particles and the dense medium is recovered from the high and low density fractions by screening and washing to yield a first product recovered from the high density fraction and a second product recovered from the low density fraction the improvement wherein at least one of said first or said second product is subjected to further separation to recover substantially all of the magnetic particles in said dense medium made up of magnetic particles comprising:
subjecting said at least one product to a hydrocyclone separation to yield a dense fraction substantially comprising a dense medium suspension made up of magnetic particles and a light fraction comprising a dense medium suspension made up of magnetic particles and particulate material fine enough to pass through said screen and subjecting said light fraction to magnetic separation whereby said dense medium suspension made up of magnetic particles is separated from said particulate material and retained.
subjecting said at least one product to a hydrocyclone separation to yield a dense fraction substantially comprising a dense medium suspension made up of magnetic particles and a light fraction comprising a dense medium suspension made up of magnetic particles and particulate material fine enough to pass through said screen and subjecting said light fraction to magnetic separation whereby said dense medium suspension made up of magnetic particles is separated from said particulate material and retained.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ZA755123A ZA755123B (en) | 1975-08-08 | 1975-08-08 | Dense medium separation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1053612A true CA1053612A (en) | 1979-05-01 |
Family
ID=25569330
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA258,599A Expired CA1053612A (en) | 1975-08-08 | 1976-08-06 | Density and magnetic separations |
Country Status (8)
| Country | Link |
|---|---|
| AU (1) | AU500131B2 (en) |
| BR (1) | BR7605203A (en) |
| CA (1) | CA1053612A (en) |
| DE (1) | DE2635161C2 (en) |
| GB (1) | GB1541265A (en) |
| IN (1) | IN145504B (en) |
| ZA (1) | ZA755123B (en) |
| ZM (1) | ZM10376A1 (en) |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE826891C (en) * | 1949-08-04 | 1952-01-07 | Stamicarbon | Process for separating mixtures |
| DE1030785B (en) * | 1955-06-04 | 1958-05-29 | Stamicarbon | Method and device for separating solid mixtures according to weight with the aid of a separating vessel |
| DE1215615B (en) * | 1957-09-19 | 1966-05-05 | Mineral Proc Corp | Process for sorting a non-magnetic, weight-differentiated solid mixture |
| DE1224935B (en) * | 1964-12-09 | 1966-09-15 | Stolberger Zink Ag | Process and system for the processing of lead-containing batteries |
-
1975
- 1975-08-08 ZA ZA755123A patent/ZA755123B/en unknown
-
1976
- 1976-08-05 DE DE2635161A patent/DE2635161C2/en not_active Expired
- 1976-08-06 CA CA258,599A patent/CA1053612A/en not_active Expired
- 1976-08-07 IN IN1423/CAL/76A patent/IN145504B/en unknown
- 1976-08-09 GB GB33016/76A patent/GB1541265A/en not_active Expired
- 1976-08-09 BR BR7605203A patent/BR7605203A/en unknown
- 1976-08-10 ZM ZM103/76A patent/ZM10376A1/en unknown
- 1976-08-10 AU AU16729/76A patent/AU500131B2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| AU1672976A (en) | 1978-02-16 |
| BR7605203A (en) | 1977-08-09 |
| GB1541265A (en) | 1979-02-28 |
| IN145504B (en) | 1978-10-28 |
| ZA755123B (en) | 1977-03-30 |
| AU500131B2 (en) | 1979-05-10 |
| ZM10376A1 (en) | 1977-08-22 |
| DE2635161C2 (en) | 1984-10-31 |
| DE2635161A1 (en) | 1977-02-24 |
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