CA2802519C - Centrifugal concentrator - Google Patents
Centrifugal concentrator Download PDFInfo
- Publication number
- CA2802519C CA2802519C CA2802519A CA2802519A CA2802519C CA 2802519 C CA2802519 C CA 2802519C CA 2802519 A CA2802519 A CA 2802519A CA 2802519 A CA2802519 A CA 2802519A CA 2802519 C CA2802519 C CA 2802519C
- Authority
- CA
- Canada
- Prior art keywords
- cone
- outer shell
- rotor
- concentrator
- threshold
- 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 - Fee Related
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
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04B—CENTRIFUGES
- B04B1/00—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04B—CENTRIFUGES
- B04B7/00—Elements of centrifuges
- B04B7/08—Rotary bowls
Landscapes
- Centrifugal Separators (AREA)
Abstract
A concentrator has a rotor with an inner truncated cone having a bottom on the smaller base and arranged concentrically with an outer shell such that an annular slit is formed between the shell and the edge of the larger base of the cone. The outer shell is provided with annular thresholds at both ends, namely, a drain threshold on the side of the larger base of the cone and a heavy fraction collecting threshold.. The inner cone and outer shell are connected together, and the rotor has passages for supplying flushing water into the outer shell. The rotor axis may be provided, on the bottom of the inner cone, with a sleeve having a seal for a water supply pipe.The inner diameter of the drain threshold may be equal to, or smaller than, the inner diameter of the heavy fraction collecting threshold. The rotor rotation may perform torsional oscillations.
Description
CENTRIFUGAL CONCENTRATOR
Field of the invention The invention relates to concentration of minerals and can be used for separating solids according to density, for example, at enterprises of the complex metals industry, tin factories, and gold mining enterprises for primary concentration and processing of industrial waste piles.
Background of the invention It is common knowledge that gravity separation is the most environment-friendly method. Further, the centrifugal method is the most advanced and most effective technique for concentrating small-grained mixtures (placers or crushed ores) containing small and fine fractions of heavy minerals. Centrifugal forces help reduce significantly the size of recovered particles compared to the traditional gravity flotation technique. Where the valuable heavy component of the feedstock may equal to a few tenths of a percentage point or more, concentrators have to discharge the heavy fraction continuously.
Centrifugal continuous discharge concentrators are known to be used in prior art, for example, the Kelsey jigging machine disclosed in published International Patent Application WO 86/04269. The machine comprises a cylindrical chamber having a rotor rotating about a vertical axis inside the machine and having a vertical wall serving as the sieve of the jigging machine. A series of tapered chambers are arranged along the cylindrical chamber perimeter to produce water pulsations in the opposite direction to the centrifugal force using vibrators of a special design. In operation, heavy mineral fractions penetrate through the sieve and light fractions are discharged over the upper surface. The prior art machine is deficient because of its complexity in design and operation, and also because heavy fractions of fine grades are washed out.
Another prior art invention is a Knelson-CVD continuous discharge centrifugal concentrator. The concentrator comprises a rotating cone-shaped rotor having two grooves in the upper part thereof provided with sphincter valves arranged circumferentially therein. The bottom of a groove is provided with orifices for supplying fluidizing water thereinto. In operation, the heavy fraction accumulates in the grooves, and the valves open periodically to discharge the accumulating concentrate. The concentrate output is varied depending on the frequency and time the sphincter valves remain open (Promotional and Information Bulletin "Gold Mining," IRGIREDMET, No. 119, October 2008, p. 23). This concentrator is deficient because it has a complicated design, high requirements are placed on the purity of fluidizing water, and the valves wear out when abrasive material is used.
Field of the invention The invention relates to concentration of minerals and can be used for separating solids according to density, for example, at enterprises of the complex metals industry, tin factories, and gold mining enterprises for primary concentration and processing of industrial waste piles.
Background of the invention It is common knowledge that gravity separation is the most environment-friendly method. Further, the centrifugal method is the most advanced and most effective technique for concentrating small-grained mixtures (placers or crushed ores) containing small and fine fractions of heavy minerals. Centrifugal forces help reduce significantly the size of recovered particles compared to the traditional gravity flotation technique. Where the valuable heavy component of the feedstock may equal to a few tenths of a percentage point or more, concentrators have to discharge the heavy fraction continuously.
Centrifugal continuous discharge concentrators are known to be used in prior art, for example, the Kelsey jigging machine disclosed in published International Patent Application WO 86/04269. The machine comprises a cylindrical chamber having a rotor rotating about a vertical axis inside the machine and having a vertical wall serving as the sieve of the jigging machine. A series of tapered chambers are arranged along the cylindrical chamber perimeter to produce water pulsations in the opposite direction to the centrifugal force using vibrators of a special design. In operation, heavy mineral fractions penetrate through the sieve and light fractions are discharged over the upper surface. The prior art machine is deficient because of its complexity in design and operation, and also because heavy fractions of fine grades are washed out.
Another prior art invention is a Knelson-CVD continuous discharge centrifugal concentrator. The concentrator comprises a rotating cone-shaped rotor having two grooves in the upper part thereof provided with sphincter valves arranged circumferentially therein. The bottom of a groove is provided with orifices for supplying fluidizing water thereinto. In operation, the heavy fraction accumulates in the grooves, and the valves open periodically to discharge the accumulating concentrate. The concentrate output is varied depending on the frequency and time the sphincter valves remain open (Promotional and Information Bulletin "Gold Mining," IRGIREDMET, No. 119, October 2008, p. 23). This concentrator is deficient because it has a complicated design, high requirements are placed on the purity of fluidizing water, and the valves wear out when abrasive material is used.
2 The Falcon-C centrifugal continuous operation concentrator is a further prior art invention. It is close to the Knelson-CVD concentrator in design and operating principle. The concentrator comprises a housing with a rotating cone therein, together with a central pipe to supply feedstock, and discharge sleeves for the tailings and concentrate. The cone has an annular groove in the top part thereof. In operation, the heavy fraction is deposited on the smooth inside surface of the cone and slides gradually into the groove. The concentrate is discharged continuously through outlet valves (Mining Journal, No. 3, 1999, p. 78).
This concentrator has the same deficiencies as the Knelson-CVD concentrator, namely, a complicated design and abrasive wear of the discharge valves. Besides, the operating mode of both concentrators can be considered continuous with a reservation only because the heavy fraction is discharged by opening the outlet valves periodically, for which reason the quality of the concentrate is reduced inevitably.
The centrifugal concentrator designed by A.B. Leites and disclosed in Patent RU
2123884 published on December 27, 1998, is the closest related prior art of the claimed invention.
The concentrator comprises a rotor in the form of an inner truncated cone with a screw on the outer surface thereof and is concentric with an outer cone, both fitted on the shafts of a reducing gear enabling them to rotate each at its own speed. The smaller bases of both cones are closed with bottoms. The outer cone has through orifices on the side of the smaller base and is provided with an annular threshold on the side of the larger base. There is an annular slit between the annular threshold and the end of the inner cone.
In operation, slurry is fed into the rotor onto the bottom of the inner cone and propelled by centrifugal forces toward the annular threshold. The heavy minerals are deposited on the internal surface of the inner cone and slide toward the annular slit where they are captured by the screw and expelled through the orifices of the outer cone into the concentrate receiver. The light fraction is drained over the annular threshold.
The closest prior art concentrator is deficient because of its complicated design and the wear of the screw and the outer cone when abrasive material is processed.
Summary of the invention The technical result of the claimed concentrator consists in simplifying its design and improving reliability of the concentrator in operation and the quality of the resultant concentrate.
This technical result is achieved in a centrifugal concentrator comprising a rotor in the form of an inner truncated cone having a bottom on the smaller base and concentric with an outer ,
This concentrator has the same deficiencies as the Knelson-CVD concentrator, namely, a complicated design and abrasive wear of the discharge valves. Besides, the operating mode of both concentrators can be considered continuous with a reservation only because the heavy fraction is discharged by opening the outlet valves periodically, for which reason the quality of the concentrate is reduced inevitably.
The centrifugal concentrator designed by A.B. Leites and disclosed in Patent RU
2123884 published on December 27, 1998, is the closest related prior art of the claimed invention.
The concentrator comprises a rotor in the form of an inner truncated cone with a screw on the outer surface thereof and is concentric with an outer cone, both fitted on the shafts of a reducing gear enabling them to rotate each at its own speed. The smaller bases of both cones are closed with bottoms. The outer cone has through orifices on the side of the smaller base and is provided with an annular threshold on the side of the larger base. There is an annular slit between the annular threshold and the end of the inner cone.
In operation, slurry is fed into the rotor onto the bottom of the inner cone and propelled by centrifugal forces toward the annular threshold. The heavy minerals are deposited on the internal surface of the inner cone and slide toward the annular slit where they are captured by the screw and expelled through the orifices of the outer cone into the concentrate receiver. The light fraction is drained over the annular threshold.
The closest prior art concentrator is deficient because of its complicated design and the wear of the screw and the outer cone when abrasive material is processed.
Summary of the invention The technical result of the claimed concentrator consists in simplifying its design and improving reliability of the concentrator in operation and the quality of the resultant concentrate.
This technical result is achieved in a centrifugal concentrator comprising a rotor in the form of an inner truncated cone having a bottom on the smaller base and concentric with an outer ,
3 shell with an annular slit provided between the shell and the end of the larger base of the cone and a threshold on the outer shell on the side of the larger base of the inner cone, the inner cone and the outer shell being rigidly connected with one another, the outer shell having an annular threshold on the side of the smaller side of the inner cone, and the rotor having passages for delivering water onto the outer shell.
The centrifugal concentrator may be provided along the rotor shaft with a sleeve on the bottom of the inner cone, said sleeve having a seal for a fixed pipe to be extended therethrough on the side of the larger base of the inner cone to supply water thereinto, said sleeve being further connected to the passages supplying water into the outer shell.
Since the inner cone and the outer shell are connected rigidly, the outer shell has an annular threshold on the side of the smaller base of the inner cone, and the rotor has passages to supply water into the outer shell, the heavy fraction accumulating at the larger base of the cone in operation passes through the annular slit and accumulates in the outer shell, and as water is fed into the outer shell the heavy fraction is washed out into the heavy fraction receiver.
For the heavy fraction to be washed out more easily and the efficiency of the concentrator in operation to be improved, the concentrator may be provided with a mechanism, for example, a double-crank mechanism, to cause the rotating rotor to perform torsional oscillations.
Brief description of the drawings FIG. 1 is a general view of the concentrator.
The concentrator comprises a rotor 1 mounted on a rotating shaft, a feedstock supply sleeve 2, a light fraction receiver 3, and a heavy fraction collector 4. Rotor 1 comprises a cone 5 having a bottom and a cylindrical shell 6 having an annular overflow threshold 7 on the side of the light fraction receiver and an annular heavy fraction collecting threshold 8. An annular slit 9 is provided between the end of the larger base of the cone and cylindrical shell 6. The inner cone of the rotor is connected rigidly to the cylindrical shell by spokes 10. The rotor axis on the bottom of the inner cone is provided with a sleeve 11 having a seal for a fixed pipe 12 to be inserted thereinto. Sleeve 11 is connected to passages extending into the interior of shell 6. The passages may have a straight radial outlet 13 into the shell or may extend along the cone with their outlet 14 ending the location of annular slit 9.
Description of the preferred embodiment of the invention The concentrator operates as follows:
The centrifugal concentrator may be provided along the rotor shaft with a sleeve on the bottom of the inner cone, said sleeve having a seal for a fixed pipe to be extended therethrough on the side of the larger base of the inner cone to supply water thereinto, said sleeve being further connected to the passages supplying water into the outer shell.
Since the inner cone and the outer shell are connected rigidly, the outer shell has an annular threshold on the side of the smaller base of the inner cone, and the rotor has passages to supply water into the outer shell, the heavy fraction accumulating at the larger base of the cone in operation passes through the annular slit and accumulates in the outer shell, and as water is fed into the outer shell the heavy fraction is washed out into the heavy fraction receiver.
For the heavy fraction to be washed out more easily and the efficiency of the concentrator in operation to be improved, the concentrator may be provided with a mechanism, for example, a double-crank mechanism, to cause the rotating rotor to perform torsional oscillations.
Brief description of the drawings FIG. 1 is a general view of the concentrator.
The concentrator comprises a rotor 1 mounted on a rotating shaft, a feedstock supply sleeve 2, a light fraction receiver 3, and a heavy fraction collector 4. Rotor 1 comprises a cone 5 having a bottom and a cylindrical shell 6 having an annular overflow threshold 7 on the side of the light fraction receiver and an annular heavy fraction collecting threshold 8. An annular slit 9 is provided between the end of the larger base of the cone and cylindrical shell 6. The inner cone of the rotor is connected rigidly to the cylindrical shell by spokes 10. The rotor axis on the bottom of the inner cone is provided with a sleeve 11 having a seal for a fixed pipe 12 to be inserted thereinto. Sleeve 11 is connected to passages extending into the interior of shell 6. The passages may have a straight radial outlet 13 into the shell or may extend along the cone with their outlet 14 ending the location of annular slit 9.
Description of the preferred embodiment of the invention The concentrator operates as follows:
4 The feedstock in slurry form is pumped into the rotor through supply sleeve 2 to the bottom of cone 5. Centrifugal forces throw the slurry against the wall of the cone, and as the slurry moves toward threshold 7 it is separated into layers. The heavy minerals are deposited on the inner surface of cone 5, slide toward slit 9, and enter shell 6, from which they are flushed by water flowing out of pipe 12 over threshold 8 into heavy fraction collector 4.
The light fraction flows over threshold 7 into receiver 3. The inner diameter of threshold 8 may be equal to, or smaller than, the inner diameter of threshold 7. The diameter length depends on the location of the rotor axis, magnitude of centrifugal forces, and the mineral composition of the feedstock. The outflow of the heavy fraction with a fixed inner diameter of threshold 8 is varied by water supplied through passages 13 (or 14). The inner cone may have an extending diameter of the larger base.
An exemplary embodiment is a concentrator of 500 kg/hr capacity with a rotor having an outer diameter of 200 mm. The outer shell had a length of 210 mm. Both thresholds had an internal diameter of 160 mm. The rotor rotated at 700 r.p.m.
A mixture of quartz sand having a grain size of minus 0.3 mm and magnetite of the same size produced the following results: the heavy fraction had a yield of 7.5%
(or reduction by a factor of 13) for a recovery rate of 78%. The solids to liquids ratio of the feedstock was 1 to 2.5.
Flushing water was used at a flow rate of 30 liters per hour.
The light fraction flows over threshold 7 into receiver 3. The inner diameter of threshold 8 may be equal to, or smaller than, the inner diameter of threshold 7. The diameter length depends on the location of the rotor axis, magnitude of centrifugal forces, and the mineral composition of the feedstock. The outflow of the heavy fraction with a fixed inner diameter of threshold 8 is varied by water supplied through passages 13 (or 14). The inner cone may have an extending diameter of the larger base.
An exemplary embodiment is a concentrator of 500 kg/hr capacity with a rotor having an outer diameter of 200 mm. The outer shell had a length of 210 mm. Both thresholds had an internal diameter of 160 mm. The rotor rotated at 700 r.p.m.
A mixture of quartz sand having a grain size of minus 0.3 mm and magnetite of the same size produced the following results: the heavy fraction had a yield of 7.5%
(or reduction by a factor of 13) for a recovery rate of 78%. The solids to liquids ratio of the feedstock was 1 to 2.5.
Flushing water was used at a flow rate of 30 liters per hour.
Claims (4)
1 . A centrifugal concentrator comprising a rotor in the form of an inner truncated cone having a bottom on the smaller base and arranged concentrically with an outer shell such that an annular slit is formed between the shell and the end of the larger base of the cone, a threshold being provided on the outer shell on the side of the larger base of the inner cone, wherein the inner cone and the outer shell are rigidly connected to one another, the outer shell having an annular threshold on the side of the smaller base of the inner cone, and the rotor being provided with passages to supply water into the outer shell.
2. A centrifugal concentrator as claimed in claim 1, wherein a sleeve is provided along the rotor axis on the bottom of the inner cone and has a seal with a pipe extending therethrough on the side of the larger base of the inner cone to supply water, and the sleeve is connected to passages to supply water into the outer shell.
3. A centrifugal concentrator as claimed in claim 1, wherein the concentrator is provided with a mechanism, causing the rotating rotor to perform torsional oscillations.
4. A centrifugal concentrator as claimed in claim 3, wherein the mechanism comprises a double-crank mechanism.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| RU2010125547 | 2010-06-23 | ||
| RU2010125547/03A RU2452579C2 (en) | 2010-06-23 | 2010-06-23 | Centrifugal concentrator |
| PCT/RU2011/000440 WO2011162640A1 (en) | 2010-06-23 | 2011-06-22 | Centrifugal concentrator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2802519A1 CA2802519A1 (en) | 2011-12-29 |
| CA2802519C true CA2802519C (en) | 2015-02-17 |
Family
ID=45371632
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2802519A Expired - Fee Related CA2802519C (en) | 2010-06-23 | 2011-06-22 | Centrifugal concentrator |
Country Status (4)
| Country | Link |
|---|---|
| CN (1) | CN102971079B (en) |
| CA (1) | CA2802519C (en) |
| RU (1) | RU2452579C2 (en) |
| WO (1) | WO2011162640A1 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103495511B (en) * | 2013-10-11 | 2015-08-19 | 耿锡岭 | A kind of Efficient centrifugal ore separator |
| CN106925436B (en) * | 2017-04-06 | 2022-12-23 | 昆明理工大学 | Tapered centrifugal ore dressing equipment |
| CN109225666B (en) * | 2018-09-30 | 2020-05-22 | 贺州市骏鑫矿产品有限责任公司 | Slag-water separation and recovery device |
| WO2023043338A1 (en) * | 2021-09-16 | 2023-03-23 | Юрий Анатольевич ШЕЛКУНОВ | Modular concentrating bowl and variants of a method of manufacturing same |
| CN116618164B (en) * | 2023-07-26 | 2023-10-03 | 赣州金环磁选科技装备股份有限公司 | Series centrifugal concentrating machine |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN86201886U (en) * | 1986-03-25 | 1987-08-19 | 云南锡业公司 | Series centrifugal concentrating machine |
| US4846781A (en) * | 1988-06-13 | 1989-07-11 | Knelson Benjamin V | Centrifugal separator |
| CN2111792U (en) * | 1990-09-04 | 1992-08-05 | 湖南省冶金规划设计院 | Outer filtration centrifugal dewatering machine |
| US5601524A (en) * | 1995-08-04 | 1997-02-11 | Knelson; Benjamin | Method of separating intermixed materials of different specific gravity with substantially intermixed discharge of fines |
| RU2091171C1 (en) * | 1995-09-11 | 1997-09-27 | Анатолий Владимирович Долгов | Centrifugal concentrator for ore dressing |
| RU2123884C1 (en) * | 1998-02-20 | 1998-12-27 | Лейтес Анатолий Борисович | Centrifugal concentrator |
| RU2177369C1 (en) * | 2000-08-28 | 2001-12-27 | Лепехин Владимир Михайлович | Centrifugal concentrator |
| RU2209680C2 (en) * | 2001-08-28 | 2003-08-10 | Институт горного дела Севера СО РАН | Flushing rotary separator |
| CA2625843C (en) * | 2008-03-31 | 2011-03-22 | Knelson Patents Inc. | Centrifugal separator of heavier particulate materials from light particulate materials in a slurry using a ring in the collection recess |
-
2010
- 2010-06-23 RU RU2010125547/03A patent/RU2452579C2/en not_active IP Right Cessation
-
2011
- 2011-06-22 WO PCT/RU2011/000440 patent/WO2011162640A1/en active Application Filing
- 2011-06-22 CA CA2802519A patent/CA2802519C/en not_active Expired - Fee Related
- 2011-06-22 CN CN201180030579.0A patent/CN102971079B/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN102971079B (en) | 2014-11-12 |
| WO2011162640A1 (en) | 2011-12-29 |
| CA2802519A1 (en) | 2011-12-29 |
| RU2010125547A (en) | 2011-12-27 |
| CN102971079A (en) | 2013-03-13 |
| RU2452579C2 (en) | 2012-06-10 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request |
Effective date: 20121212 |
|
| MKLA | Lapsed |
Effective date: 20210622 |