CA1122573A - Suction discharge for particle sorter - Google Patents
Suction discharge for particle sorterInfo
- Publication number
- CA1122573A CA1122573A CA313,446A CA313446A CA1122573A CA 1122573 A CA1122573 A CA 1122573A CA 313446 A CA313446 A CA 313446A CA 1122573 A CA1122573 A CA 1122573A
- Authority
- CA
- Canada
- Prior art keywords
- suction nozzle
- stream
- suction
- gas
- particulate material
- 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 and apparatus for use on particulate material. The method comprises feeding a thin stream of the material past at least one suction nozzle and removing selected particles of the stream by rapidly applying a suction to the suction nozzle by injecting a first burst of gas into a suitable venturi within the nozzle.
THIS INVENTION provides a concentrating method and apparatus for use on particulate material. The method comprises feeding a thin stream of the material past at least one suction nozzle and removing selected particles of the stream by rapidly applying a suction to the suction nozzle by injecting a first burst of gas into a suitable venturi within the nozzle.
Description
~2~S73 THIS I~EI'~TION relates to a concentrating ~ethod and apparatus of the type wherein selected particles of a stream of particulate feed material are removed therefrom to provide a concentrate and a tails fraction.
Such an apparatus has been used in the recovery of diamonds from a particulate mater;al. The apparatus comprises a mov-ing, endless belt on which a stream of material may be supported. I~hen a diamond is detected, using x-ray fluorescent techniques for example, a suction nozzle is operated to remove the diamond and some nf the surrounding material from the stream.
In this way a concentrate is provided which may be ~urther treated to ~ive a final product consisting of diamonds only.
An object of this invention is to provide an improved method and apparatus suitable for diamond recovery as described above. It should, however, be noted that while the description in this specification is directed towards diamond recovery, this should not be considered as a restriction to the invention which may find a wide variety of applications.
~q~
.
;
, :
1~L225~73 According to the invention a concentrating method comprises:- ~
feeding a thin stream of particulate material past at least one suction nozzle; and removing selected parti-cles of the stream by rapidly applying a suction to the suction nozzle by injecting a first burst of gas into a suitable venturi in the suction nozzle.
Further according to the invention thE stream is supported on a perforated belt and the removal of the selected particles is assisted by a second burst of gas directed through the belt into the suction nozzle substantially simultaneously with the first burst of gas.
Further according to the ;nvention the stream is con-centrated at least twice by passiny it past at least two suction nozzles in series.
According to another aspect oF the invention ap~aratus for removing selected particles From a stream of particulate material comprises a suction nozzle connected to a Yenturi and means for injecting a burst of gas ;nto the venturi to create a suction in the suction nozzle.
- ; ~ . . ~
~1~L2Z~73 Further according to this aspect oF the invention the apparatus includes a compressed gas nozzle spaced from buk directed into the suction nozzle, the compressed gas nozzle being adapted to be located below a mesh belt carrying the stream of particulate materiali and the gas is compressed air.
The invention also provides for concentrating apparatus including the apparatus as defined above, and particularly but not exclusively diamond concentrating apparatus utilizing x-ray techniques for detecting diamond particles.
lo - An embodiment of the invention, described by way of ! example only, follows with reference to the accompanying drawings in which:-Figure 1 shows in elevation an apparatus for concentra~.ing diamondi~erous materiali and Figure 2 shows a suction nozzle of the invention.
In this embodiment of the invention a method oF and apparatus for concentrating diamondiferous particulate material using kno~t~n x-ray techn;ques is provided. The method will then become apparent when the use of ~he apparatus is discussed.
An endless mesh belt 1 about l5 centimetres wide is supported by front and rear rollers numbered 2 and 3 respectlYely.
Diamondiferous particulate material is fed onto the helt by means ; ~ . , . . ; .
~ Z 5~7 3 of a sui-table hopper 4 at a position adjacent the rear roller such that the material and the belt move in direction x at a speed of about two metres per second.
The belt and material moYe consecutively under two sets of similar apparatus each comprising known x-ray irradia-tion and fluorescent detection units numbered 5 ~nd 6 respect-ively. Immediately after each detection unit is apparatus 7 for removing a diamon.i which has been detected as well as some of the surrounding gangue material.
Each of these apparatuses 7 comprises an elongated suction n,ozzle 8 of rectangular cross-section spaced a small distance above the belt and connected to a concentrate container (not shown). A small distance from the orifice of the suction nozzle is a c~mpressed air-operated venturi 9 which is controllc~
by a suitable fast acting valve 10. This venturi is adapted to create a low pressure and hence a suction at the orifice of the suction nozzle.
Below the mesh belt, directed therethrough and into the suction nozzle, is a compressed air nozzle 11 connected via a second fast acting valve to a source of compressed air.
Both of the compressed air valves are operated simultan- , eously by the x-ray fluorescent detection circuit. The compressed .
., - .
air nozzle blows a short burst of air throllgh the mesh belt to decrease the efFective weight of the particles on that portion of the belt. These particles are picked up by the suction in the suction nozzle created by a burst of compressed air passing through the venturi. Once the particles have moved past the venturi they are subjected to a positive air pressure and air current which carries -them into the concentrate container. The bursts of compressed air are of about 5 milliseconds in duration.
As there are two sets of appara-tus the particulate stream is subiected to the concentration process twice thus pro viding a primary and a secondary concentrate.
The use of the compressed air nozzles is not essential but enables the apparatus to operate on heavier particles than is the case if they are -not present. It is to be appreciated that 1~ the burst of air from these nozzles has a maximum effect on the particles at the position furthest removed from the suction nozzle where the effect of the suction created by the venturi is at a minimunl. Pre~erably the pressure of the air should not be sufficient to result in a large amount of water from the wet feed material bein~ injected into the suction nozzle.
Experimental results indicate that the method and apparatus work with any particle sizes up to 10 millimetres.
~lZ~:i;73 This invention may be used in conjunction with a small but continuous suction to be applied to the suction nozzle and for this to be supplemented by the venturi-created suction described above.
Other embodiments and methods are envisaged within the scope of the invention including its application to other particulate materials and detecting devices.
Such an apparatus has been used in the recovery of diamonds from a particulate mater;al. The apparatus comprises a mov-ing, endless belt on which a stream of material may be supported. I~hen a diamond is detected, using x-ray fluorescent techniques for example, a suction nozzle is operated to remove the diamond and some nf the surrounding material from the stream.
In this way a concentrate is provided which may be ~urther treated to ~ive a final product consisting of diamonds only.
An object of this invention is to provide an improved method and apparatus suitable for diamond recovery as described above. It should, however, be noted that while the description in this specification is directed towards diamond recovery, this should not be considered as a restriction to the invention which may find a wide variety of applications.
~q~
.
;
, :
1~L225~73 According to the invention a concentrating method comprises:- ~
feeding a thin stream of particulate material past at least one suction nozzle; and removing selected parti-cles of the stream by rapidly applying a suction to the suction nozzle by injecting a first burst of gas into a suitable venturi in the suction nozzle.
Further according to the invention thE stream is supported on a perforated belt and the removal of the selected particles is assisted by a second burst of gas directed through the belt into the suction nozzle substantially simultaneously with the first burst of gas.
Further according to the ;nvention the stream is con-centrated at least twice by passiny it past at least two suction nozzles in series.
According to another aspect oF the invention ap~aratus for removing selected particles From a stream of particulate material comprises a suction nozzle connected to a Yenturi and means for injecting a burst of gas ;nto the venturi to create a suction in the suction nozzle.
- ; ~ . . ~
~1~L2Z~73 Further according to this aspect oF the invention the apparatus includes a compressed gas nozzle spaced from buk directed into the suction nozzle, the compressed gas nozzle being adapted to be located below a mesh belt carrying the stream of particulate materiali and the gas is compressed air.
The invention also provides for concentrating apparatus including the apparatus as defined above, and particularly but not exclusively diamond concentrating apparatus utilizing x-ray techniques for detecting diamond particles.
lo - An embodiment of the invention, described by way of ! example only, follows with reference to the accompanying drawings in which:-Figure 1 shows in elevation an apparatus for concentra~.ing diamondi~erous materiali and Figure 2 shows a suction nozzle of the invention.
In this embodiment of the invention a method oF and apparatus for concentrating diamondiferous particulate material using kno~t~n x-ray techn;ques is provided. The method will then become apparent when the use of ~he apparatus is discussed.
An endless mesh belt 1 about l5 centimetres wide is supported by front and rear rollers numbered 2 and 3 respectlYely.
Diamondiferous particulate material is fed onto the helt by means ; ~ . , . . ; .
~ Z 5~7 3 of a sui-table hopper 4 at a position adjacent the rear roller such that the material and the belt move in direction x at a speed of about two metres per second.
The belt and material moYe consecutively under two sets of similar apparatus each comprising known x-ray irradia-tion and fluorescent detection units numbered 5 ~nd 6 respect-ively. Immediately after each detection unit is apparatus 7 for removing a diamon.i which has been detected as well as some of the surrounding gangue material.
Each of these apparatuses 7 comprises an elongated suction n,ozzle 8 of rectangular cross-section spaced a small distance above the belt and connected to a concentrate container (not shown). A small distance from the orifice of the suction nozzle is a c~mpressed air-operated venturi 9 which is controllc~
by a suitable fast acting valve 10. This venturi is adapted to create a low pressure and hence a suction at the orifice of the suction nozzle.
Below the mesh belt, directed therethrough and into the suction nozzle, is a compressed air nozzle 11 connected via a second fast acting valve to a source of compressed air.
Both of the compressed air valves are operated simultan- , eously by the x-ray fluorescent detection circuit. The compressed .
., - .
air nozzle blows a short burst of air throllgh the mesh belt to decrease the efFective weight of the particles on that portion of the belt. These particles are picked up by the suction in the suction nozzle created by a burst of compressed air passing through the venturi. Once the particles have moved past the venturi they are subjected to a positive air pressure and air current which carries -them into the concentrate container. The bursts of compressed air are of about 5 milliseconds in duration.
As there are two sets of appara-tus the particulate stream is subiected to the concentration process twice thus pro viding a primary and a secondary concentrate.
The use of the compressed air nozzles is not essential but enables the apparatus to operate on heavier particles than is the case if they are -not present. It is to be appreciated that 1~ the burst of air from these nozzles has a maximum effect on the particles at the position furthest removed from the suction nozzle where the effect of the suction created by the venturi is at a minimunl. Pre~erably the pressure of the air should not be sufficient to result in a large amount of water from the wet feed material bein~ injected into the suction nozzle.
Experimental results indicate that the method and apparatus work with any particle sizes up to 10 millimetres.
~lZ~:i;73 This invention may be used in conjunction with a small but continuous suction to be applied to the suction nozzle and for this to be supplemented by the venturi-created suction described above.
Other embodiments and methods are envisaged within the scope of the invention including its application to other particulate materials and detecting devices.
Claims (9)
1. A concentrating method comprising:
feeding a thin stream of particulate material past at least one suction nozzle; and removing selected particles of the stream by rapidly applying a suction to the suction nozzle by inject-ing a first burst of gas into a suitable venturi in the suction nozzle.
feeding a thin stream of particulate material past at least one suction nozzle; and removing selected particles of the stream by rapidly applying a suction to the suction nozzle by inject-ing a first burst of gas into a suitable venturi in the suction nozzle.
2. A method as claimed in claim 1 in which the stream is supported on a perforated belt.
3. A method as claimed in claim 2 in which the removal of the selected particles is assisted by a second burst of gas directed through the belt into the suction nozzle substantially simultaneously with the first burst of gas.
4. A method as claimed in claim 1 in which the stream is concentrated at least twice by passing it past at least two suction nozzles in series.
5. Apparatus for removing selected particles from a stream of particulate material, comprising:
a suction nozzle adapted to be located adjacent to a stream of particulate material;
a venturi connected to the suction nozzle;
means for injecting a burst of gas into the venturi to create a suction in the suction nozzle to suck particulate material from said stream; and a detection device operably connected to said injecting means, said detection device including means for detecting particles having a predetermined characteristic and means for activating said injecting means when said particles are adjacent to the suction nozzle.
a suction nozzle adapted to be located adjacent to a stream of particulate material;
a venturi connected to the suction nozzle;
means for injecting a burst of gas into the venturi to create a suction in the suction nozzle to suck particulate material from said stream; and a detection device operably connected to said injecting means, said detection device including means for detecting particles having a predetermined characteristic and means for activating said injecting means when said particles are adjacent to the suction nozzle.
6. Apparatus as claimed in claim 5 which includes a compressed gas nozzle spaced from but directed into the suction nozzle, the compressed gas nozzle being adapted to be located below a mesh belt carrying the stream of particulate material.
7. Concentrating apparatus including at least one apparatus as claimed in claim 5.
8. Concentrating apparatus including at least one apparatus as claimed in claim 6.
9. Concentrating apparatus as claimed in claim 7 or 8 for use in diamond recovery and utilizing x-ray irradiation techniques for detecting diamonds.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ZA77/6370 | 1977-10-26 | ||
| ZA00776370A ZA776370B (en) | 1977-10-26 | 1977-10-26 | An improved concentrating method and apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1122573A true CA1122573A (en) | 1982-04-27 |
Family
ID=25572198
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA313,446A Expired CA1122573A (en) | 1977-10-26 | 1978-10-13 | Suction discharge for particle sorter |
Country Status (3)
| Country | Link |
|---|---|
| AU (1) | AU506418B1 (en) |
| CA (1) | CA1122573A (en) |
| ZA (1) | ZA776370B (en) |
-
1977
- 1977-10-26 ZA ZA00776370A patent/ZA776370B/en unknown
-
1978
- 1978-10-11 AU AU40599/78A patent/AU506418B1/en not_active Expired
- 1978-10-13 CA CA313,446A patent/CA1122573A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| ZA776370B (en) | 1979-01-31 |
| AU506418B1 (en) | 1980-01-03 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |