CA1125706A - Concentrating method and apparatus - Google Patents
Concentrating method and apparatusInfo
- Publication number
- CA1125706A CA1125706A CA312,300A CA312300A CA1125706A CA 1125706 A CA1125706 A CA 1125706A CA 312300 A CA312300 A CA 312300A CA 1125706 A CA1125706 A CA 1125706A
- Authority
- CA
- Canada
- Prior art keywords
- suction
- nozzle
- stream
- suction nozzle
- particles
- 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
Landscapes
- Analysing Materials By The Use Of Radiation (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
THIS INVENTION provides a concentrating method in which a thin stream of particulate material is fed past a suction nozzle. A continuous suction which is insufficient to re-move particles from the stream is applied to the nozzle.
Particles which have been selected by known means are re-moved from the stream by rapidly increasing the suction on the nozzle.
THIS INVENTION provides a concentrating method in which a thin stream of particulate material is fed past a suction nozzle. A continuous suction which is insufficient to re-move particles from the stream is applied to the nozzle.
Particles which have been selected by known means are re-moved from the stream by rapidly increasing the suction on the nozzle.
Description
11;~5706 ;
THIS INVENTION relates to concentrating method and apparatus of the type wherein a selected porticn of a stream of particulate feed material is removed intermittently from the stream to provide a concentrate and tails fraction.
`
Such an apparatus has been used in diamond gravel concentration and comprises an endless mesh belt on which a stream of material may be supported. When a diamond is detected, for ev~ample by x-ray fluorescent detection, a suction noz~le is operated ~ihich removes the diamond and surrounding material from the stream. In this way a concentrate is provided which may be further treated to give a final product consisting of diamonds only.
` An object of this invention is to provide an improved method and apparatus suitable for diamond concentration as described above. It should be noted here that although the invention is described with reference to diamond recovery this should not be - considered as a restriction to the invention which may find a wide ~-~ variety of applications.
~lZ57~(~6 According to the invention a concentrating method comprises:-feeding a thin stream of particulate material past at least one suction nozzle;
applying a continuous suction to the nozzle, this suction being insufficient to re~ove particles from the stream; and removing selected particles from the stream by rapidly increasing the SUCtiLn on the suction nozzle.
. .
Preferably the suction is rapidly increased by ;~ 10 injecting a burst of air into a venturi in the suction nozzle and ; the s~ream of material is in the form of a monolayer and is preferably - supported on a mesh belt.
Accordi ng to another aspect of the i nventi o~, apparatus for remoYing selected par licles from a stream of particu-late material comprises at least one suction nozzle, means for app~ying a required continuous suction to the nozzle and means for rapidly increasing the suction on the suction nozzle.
. Preferably the means for rapidly in~reasing the suction on the suction nozzle eomprises a gas-operated venturi located jR the nozzle, and preferably the gas is compressed air.
.
"~
~1~5706 The invention also provides for concentrating apparatus including the apparatus as defined and particularly diamond concentrating apparatus utilizing x-ray detec-tion methods.
An embodiment of the invention described by way of example only, follows with reference tothe accompanying drawing which is a diagrammatic representation of apparatus for - use in diamond concentration.
In this embodiment apparatus for removing diamonds and adjacent particles from a stream of particulate material is described in conjunction with a diamond concentrator and a method of diamond concentration will be apparent from this description.
The diamond concentrator comprises an endless mesh belt 1 indicated in dotted lines which is approximately 15 centi-metres in width and is supported by three triangularly spaced rollers numbered 2, 3, and 4. A feeder bin 5 feeds particulate diamondiferous material onto the section of the belt beiween rollers 4 and 2 and adjacent to the former roller.
.. . .
The belt 1 moves slowly in direction x from roller 4 towards roller 2 under a series of sprays 6 which help ensure that the particulate material is in the form of a mono-layer by the time it reaches a diamond detection system operating at the position indicated by arrow y. This detection system is preferably an x-ray operai?d system as is ~ell known in the diamond mining industry.
~1~57~6 Briefly these sys-tems detect light emitted by fluorescing diamonds which have been excited by exposure to x-rays of a suitable wave length.
Immediately after the detec-tion s~stem is an elongated suction nozzle 7 which spans the width of the belt 1 and spaced a small distance above the belt so that the particu-late material on the belt can closely pass under it.
A continuous suction is applied to the nozzle 7 via a suction pipe 10. This suction is insufficient to lift the particles from the belt except perhaps for small particles which lie outside the particular size range of particulate material being processed. The number of these particles will be low, however, if the material has been properly sized.
Inside the nozzle 7 is a compessed air-operated : 15 venturi 8. This venturi is connected to a source of compressed - air via a suitable valve 9 which is normally closed. This valve is designed to have an extremely short reaction time. The diamond detection system opens the valve 9 when a diamond is detected in the gravel stream, thus injecting a short, rapid blast of air into the venturi. This in turn increases the amount of suction in the nozzle to a degree sufficient to remove the diamond together with some of the adjacent particles of gangue in the stream. The removed particles are sucked along pipe 8 into ~L~S 7~6 a concentrate bin and the tailings from the operation are discharged off the belt as it passes over roller 2.
By applying a continuous suction to the nozzle and supplemen-ting -this when necessary Ihe required a,mount of suction to remove a portion of the gravel may be more rapidly removed thus resulting in closer control and an improved con-centrate.
Although the above embodiment has been described as applied to diamond concentration it is envisaged that the invention will find application in sorting a wide variety of materials.
THIS INVENTION relates to concentrating method and apparatus of the type wherein a selected porticn of a stream of particulate feed material is removed intermittently from the stream to provide a concentrate and tails fraction.
`
Such an apparatus has been used in diamond gravel concentration and comprises an endless mesh belt on which a stream of material may be supported. When a diamond is detected, for ev~ample by x-ray fluorescent detection, a suction noz~le is operated ~ihich removes the diamond and surrounding material from the stream. In this way a concentrate is provided which may be further treated to give a final product consisting of diamonds only.
` An object of this invention is to provide an improved method and apparatus suitable for diamond concentration as described above. It should be noted here that although the invention is described with reference to diamond recovery this should not be - considered as a restriction to the invention which may find a wide ~-~ variety of applications.
~lZ57~(~6 According to the invention a concentrating method comprises:-feeding a thin stream of particulate material past at least one suction nozzle;
applying a continuous suction to the nozzle, this suction being insufficient to re~ove particles from the stream; and removing selected particles from the stream by rapidly increasing the SUCtiLn on the suction nozzle.
. .
Preferably the suction is rapidly increased by ;~ 10 injecting a burst of air into a venturi in the suction nozzle and ; the s~ream of material is in the form of a monolayer and is preferably - supported on a mesh belt.
Accordi ng to another aspect of the i nventi o~, apparatus for remoYing selected par licles from a stream of particu-late material comprises at least one suction nozzle, means for app~ying a required continuous suction to the nozzle and means for rapidly increasing the suction on the suction nozzle.
. Preferably the means for rapidly in~reasing the suction on the suction nozzle eomprises a gas-operated venturi located jR the nozzle, and preferably the gas is compressed air.
.
"~
~1~5706 The invention also provides for concentrating apparatus including the apparatus as defined and particularly diamond concentrating apparatus utilizing x-ray detec-tion methods.
An embodiment of the invention described by way of example only, follows with reference tothe accompanying drawing which is a diagrammatic representation of apparatus for - use in diamond concentration.
In this embodiment apparatus for removing diamonds and adjacent particles from a stream of particulate material is described in conjunction with a diamond concentrator and a method of diamond concentration will be apparent from this description.
The diamond concentrator comprises an endless mesh belt 1 indicated in dotted lines which is approximately 15 centi-metres in width and is supported by three triangularly spaced rollers numbered 2, 3, and 4. A feeder bin 5 feeds particulate diamondiferous material onto the section of the belt beiween rollers 4 and 2 and adjacent to the former roller.
.. . .
The belt 1 moves slowly in direction x from roller 4 towards roller 2 under a series of sprays 6 which help ensure that the particulate material is in the form of a mono-layer by the time it reaches a diamond detection system operating at the position indicated by arrow y. This detection system is preferably an x-ray operai?d system as is ~ell known in the diamond mining industry.
~1~57~6 Briefly these sys-tems detect light emitted by fluorescing diamonds which have been excited by exposure to x-rays of a suitable wave length.
Immediately after the detec-tion s~stem is an elongated suction nozzle 7 which spans the width of the belt 1 and spaced a small distance above the belt so that the particu-late material on the belt can closely pass under it.
A continuous suction is applied to the nozzle 7 via a suction pipe 10. This suction is insufficient to lift the particles from the belt except perhaps for small particles which lie outside the particular size range of particulate material being processed. The number of these particles will be low, however, if the material has been properly sized.
Inside the nozzle 7 is a compessed air-operated : 15 venturi 8. This venturi is connected to a source of compressed - air via a suitable valve 9 which is normally closed. This valve is designed to have an extremely short reaction time. The diamond detection system opens the valve 9 when a diamond is detected in the gravel stream, thus injecting a short, rapid blast of air into the venturi. This in turn increases the amount of suction in the nozzle to a degree sufficient to remove the diamond together with some of the adjacent particles of gangue in the stream. The removed particles are sucked along pipe 8 into ~L~S 7~6 a concentrate bin and the tailings from the operation are discharged off the belt as it passes over roller 2.
By applying a continuous suction to the nozzle and supplemen-ting -this when necessary Ihe required a,mount of suction to remove a portion of the gravel may be more rapidly removed thus resulting in closer control and an improved con-centrate.
Although the above embodiment has been described as applied to diamond concentration it is envisaged that the invention will find application in sorting a wide variety of materials.
Claims (8)
1. A concentrating method comprising:-feeding a thin stream of particulate material past at least one suction nozzle, applying a continuous suction to the nozzle, this suction being insufficient to remove particles from the stream; and removing selected particles from the stream by rapidly increasing the suction on the suction nozzle.
2. A method as claimed in claim 1 in which the suction is rapidly increased by injecting a burst of air into a venturi in the suction nozzle.
3. A method as claimed in claim 1 in which the stream of material is in the form of a monolayer.
4. A method as claimed in claim 1 in which the stream of material is supported on a mesh belt.
5. Concentrating apparatus for removing selected particles from a stream of particulate material comprising at least one suction nozzle, means for applying a required continuous suction to the nozzle and means for rapidly increasing the suction on the suction nozzle.
6. Concentrating apparatus as claimed in claim 5 in which the means for rapidly increasing the suction on the suction nozzle comprises a gas-operated venturi located in the nozzle.
7. Concentrating apparatus as claimed in claim 6 in which the gas-operated venturi is adapted to be operated by compressed air.
8. Concentrating apparatus as claimed in claim 5, 6 or 7 being adapted for the concentration of diamond containing particulate material and including means for detecting diamonds using x-ray fluorescence techniques.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ZA77/5899 | 1977-10-04 | ||
| ZA00775899A ZA775899B (en) | 1977-10-04 | 1977-10-04 | An improved concentrating method and apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1125706A true CA1125706A (en) | 1982-06-15 |
Family
ID=25572103
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA312,300A Expired CA1125706A (en) | 1977-10-04 | 1978-09-28 | Concentrating method and apparatus |
Country Status (3)
| Country | Link |
|---|---|
| AU (1) | AU506417B1 (en) |
| CA (1) | CA1125706A (en) |
| ZA (1) | ZA775899B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1993003863A1 (en) * | 1991-08-22 | 1993-03-04 | Technological Resources Pty. Ltd. | Ore sorting |
-
1977
- 1977-10-04 ZA ZA00775899A patent/ZA775899B/en unknown
-
1978
- 1978-09-28 CA CA312,300A patent/CA1125706A/en not_active Expired
- 1978-09-29 AU AU40318/78A patent/AU506417B1/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1993003863A1 (en) * | 1991-08-22 | 1993-03-04 | Technological Resources Pty. Ltd. | Ore sorting |
Also Published As
| Publication number | Publication date |
|---|---|
| ZA775899B (en) | 1978-12-27 |
| AU506417B1 (en) | 1980-01-03 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |