EP0222803A1 - Hydraulic classifying procedure and means. - Google Patents
Hydraulic classifying procedure and means.Info
- Publication number
- EP0222803A1 EP0222803A1 EP19860902838 EP86902838A EP0222803A1 EP 0222803 A1 EP0222803 A1 EP 0222803A1 EP 19860902838 EP19860902838 EP 19860902838 EP 86902838 A EP86902838 A EP 86902838A EP 0222803 A1 EP0222803 A1 EP 0222803A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- classifying
- centrifugal field
- space
- classifying space
- coarse product
- 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.)
- Granted
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04C—APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES
- B04C5/00—Apparatus in which the axial direction of the vortex is reversed
- B04C5/14—Construction of the underflow ducting; Apex constructions; Discharge arrangements ; discharge through sidewall provided with a few slits or perforations
- B04C5/18—Construction of the underflow ducting; Apex constructions; Discharge arrangements ; discharge through sidewall provided with a few slits or perforations with auxiliary fluid assisting discharge
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04C—APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES
- B04C9/00—Combinations with other devices, e.g. fans, expansion chambers, diffusors, water locks
Definitions
- the present invention concerns a hydraulic classifying procedure wherein particulate material transported by a liquid is divided, in a centrifugal field established in a cylindrical, substantially vertical classifying space, into a fines product consisting of lighter particles, this product becoming separated in the centre of the centrifugal field, and into a coarse product consisting of heavier particles, this latter product being separated on the outer margin of the centrifugal field and descending in a spiralling flow following the margin of the field, to the lower end of the classifying space.
- the commonest means employed towards hydraulic classification of particulate material is the hydrocyclone, usually consisting of a cylindrical upper part and a conical lower part.
- the hydrocyclone divides the material to be classified into a fines product, which is removed through the top end of the cyclone, and a coarse product, which is removed from the lower end of the cyclone, i.e., through an aperture at the tip of the conical lower part.
- cyclones with level bottom have been used, in which separation of the fines and coarse products and their departure take place in substantially like manner.
- classifying means are knwon in which the coarse product is removed tangentially with the aid of a passage commencing on the periphery or at the bottom of the means.
- the classifying carried out with said means of prior art is encumbered by the drawback that the coarse product is removed by a liquid classifying fluid among which there is also finely divided matter contained in the material that is being classified and which, ideally, should end up among the fines product. Finely divided matter is removed along with the coarse product in at least equal proprotion as classifying fluid is removed, in other wards, the mare such matter is removed the higher is thus the ratio of coarse and fine product quantities.
- the separation sharpness of classification carried out with means of prior art that is the proportion of particles smaller than a given limit size contained in the material being classified which are successfully separated to form the fines product, is typically only about 50%, and occasionally it is even less than 40%.
- the object of the present invention is to devise a hydraulic classifying procedure in which the above-mentioned drawbacks of the state of art are avoided and by which is obtained better separation sharpness than before, and controllability of the classifying process.
- the procedure of the invention is characterized in that the coarse product is removed from the centrifugal field through an annular gap formed an the lower end of the classifying space, using as aid a separate liquid flow conducted tangentially in relation to the centrifugal field and which is tangential to said gap.
- the centrifugal field can be boosted with said liquid flow so that the coarse product is caused to separate at a sufficient rate even in those instances in which the limiting size between the fines and coarse products is small.
- a secondary classification step has been created in the region of the annular gap, its operation being based on the fact that the velocity and direction, in the gap, of the separate liquid flow supplied tangentially in relation to the centrifugal field determine that particle size of which the removal as coarse product, enforced by the centrifugal field, is possible. Since the coarse product has not yet, at this stage, finally departed from the first classifying step taking place in the classifying space proper, said secondary classification influences the separation limit in such way that particles finer than the limit size which have been entrained will return to the classifying space, and by this route further to join the fines product. If the coarse product were brought into contact with the separate liquid flow removing it, only after it has departed from the classifying space proper, the result would merely be dilution of the coarse product flow.
- An embodiment of the invention is characterized in that the coarse product is separated from said separate liquid flow in a hydrocyclone, whereafter the liiquid is returned to the classifying process to serve as fluid medium in the classification taking place in the centrifugal field.
- the advantage gained is then that the liquid balance in the classification is not changed, compared with classical hydrocyclone separation. This is of particular significance in solid material wet grinding processes, in which the solid matter content of the sludges which they produce is usually strongly limited owing to further processing steps.
- the invention also concerns a means for hydraulic classification of particulate material by the procedure described above.
- the means comprises, as elements known in themselves, a cylindrical, substantially vertical classifying space, in which a centrifugal field can be established; a feed passage for supplying the material to be classified and a liquid serving as fluid medium into the classifying spacel and removal apertures for removing the fines product consisting of lighter particles, which separates in the centre of the classifying space, and the coarse product consisting of heavier particles, which separates on the outer margin of the classifying space and further separates in the form of a spiralling, descending flaw in the lower part of the classifying space.
- the means is characterized in that the coarse product removal aperture consists of an annular gap an the lower end af the classifying space, and that with the means, at said gap, connects a passage which is tangential to the centrifugal field, so that in removing the coarse product one can utilize a liquid flow conducted through this separate passage and running tangentially to the gap.
- Fig. 1 presents a hydraulic classifying apparatus according to the invention
- Fig. 2 shows the lower part of the cylindrical classifying space belonging to the apparatus of Fig. 1, in section II-II as indicated in Fig. 1 ,
- Fig. 3 presents part of the classifying space of the apparatus in accordance with another embodiment of the invention.
- Fig. 4 shows the classifying apparatus of the invention, installed as a component in a grinding circuit.
- a hydrffaulic classifying apparatus which divides particulate material composed of various-sized particles and transported by a liquid, such as water for instance, into a fines product consisting of lighter particles and a coarse product consisting of heavier particles.
- This classification takes place in a vertical, cylindrical classifying space 1 in a centrifugal field created by the tangential supply of material to be classified and of liquid serving as fluid medium, this centrifugal field separating the fines product to reside in the centre of the classifying space and the coarse product to its outer margin.
- the material to be classified and the fluid are in spiralling rotary motion in the classifying space 1, this motion lifting in the centre of the space the fines product to the removal aperture 2 located close to the upper end of said space, and on the outer margin of the space by gravity action urging the coarse product to the coarse product removal aperture 3 in the lower part of said space.
- the apparatus of Figs 1 and 2 comprises on the side of the cylindrical classifying space 1, as essential components, a feed passage 4 for material to be classified and for fluid medium, tangentially connecting with the upper end of the classifying space; a passage 5 for removing fines product and fluid conducting same, commencing at the removal aperture 2; a round closing plate 6 in the lower part of the classifying space, this plate confining the coarse product removal aperture to be an annular gap 3 between this plate and the cylindrical wall of the classifying space; and horizontal passages 7a, 7b connecting tangentially with the lower end of the classifying space for removal of the coarse product that has passed through the gap, with the aid of a separate liquid flow which runs tangentially to said gap.
- the liquid flaw coming through the passage 7a is supplied through the aperture 9a into the lower end of the classifying space, immediately under the annular gap 3, where it is set in spiralling motion conforming to the outer margin of said space and which is a direct continuation of the spiralling motion present higher up, in the classifying space 1 proper, and it departs by the aperture 9b into the passage 7b.
- the passage 7a has been provided with a control valve, indicated in Fig. 1 with reference numeral 8.
- the liquid flow departing by the passage 7b transports the coarse product to a hydrocyclone 10, where the coarse product is separated to go to the removal aperture 11 at the conical end of the cyclone and the liquid, to the vertical removal passage 12 commencing in the upper part of the cyclone.
- Fig. 3 is depicted an embodiment of the classifying apparatus which differs from that of Fig. 1 in the respect that the lower part 13 of the cylindrical classifying space 1 has been enlarged and on the boundary 13 between the wider lower part of the space and the narrower part 14 thereabove has been disposed a conical, vertically movable closing member 16.
- the size of the arrnular coarse product removal aperture 3 between the closing member 16 and the classifying space 3 can be regulated in this embodiment with the aid of the positioning of said closing member.
- the removal of the coarse product through the passage 7 with the aid of a liquid flow conducted tangentially in relation to the classifying space 1 and not participating in the classifying process prevents any finely divided material, which belongs to the fines product, from being intrained with the coarse product.
- the liquid flow can be regulated by mens of the control valve 3 in said passage, and the flow can be arranged to be such, for instance, that it takes care alone by itself of the coarse product removal, whereby the fluid coming into the classifying space 1 together with the material to be classified will in its entirety depart along with the fines product and there will be no fluid medium flow in one direction nor in the other at. the coarse product removal aperture 3.
- Fig. 4 is presented a solid material grinding circuit comprising a classifying space 1 and a separator cyclone 10, which may both be as illustrated in Fig. 1.
- the material consisting in part of not previously processed material (reference numeral 17) and in part of coarse product separated by the hydrocyclone 10 (reference numeral 11) is ground in the mill 18, and after grinding, the material is mixed together with water obtained from the cyclone 10 and it is fed by the aid of the pump 19, tangentially, into the centrifugal field in the classifying space 1.
Landscapes
- Cyclones (AREA)
- Separation Of Solids By Using Liquids Or Pneumatic Power (AREA)
Abstract
Dans le procédé et l'appareil ci-décrits, un matériau particulaire transporté par un liquide est divisé dans un champ centrifuge créé dans un espace de tri (1) cylindrique, sensiblement vertical en des produits de fines composés de particules les plus légères, ces produits étant séparés au centre du champ centrifuge, et en des produits grossiers composés des particules les plus lourdes, lesquelles sont séparées à la périphérie du champ centrifuge et descendent dans un flux en spirale suivant la périphérie du champ, jusqu'à l'extrémité inférieure de l'espace de flux. Les produits grossiers sont extraits du champ centrifuge par une ouverture annulaire (3) formée à l'extrémité inférieure de l'espace de tri (1), à l'aide d'un flux de liquide séparé dirigé tangentiellement par rapport au champ centrifuge et s'écoulant tangentiellement par rapport à ladite ouverture. Les produits grossiers peuvent être acheminés de concert avec le flux de liquide jusqu'à un hydrocyclone (10) qui sépare les produits grossiers, après quoi le liquide peut être recyclé pour servir de milieu fluide dans le processus de tri se déroulant dans le champ centrifuge.In the process and the apparatus described below, a particulate material transported by a liquid is divided in a centrifugal field created in a sorting space (1) cylindrical, substantially vertical into products of fine compounds of lighter particles, these products being separated in the center of the centrifugal field, and into coarse products composed of the heaviest particles, which are separated at the periphery of the centrifugal field and descend in a spiral flow along the periphery of the field, to the lower end flow space. The coarse products are extracted from the centrifugal field through an annular opening (3) formed at the lower end of the sorting space (1), using a separate liquid flow directed tangentially with respect to the centrifugal field and flowing tangentially with respect to said opening. The coarse products can be conveyed together with the liquid flow to a hydrocyclone (10) which separates the coarse products, after which the liquid can be recycled to serve as a fluid medium in the sorting process taking place in the centrifugal field .
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT86902838T ATE46834T1 (en) | 1985-05-03 | 1986-05-05 | METHOD AND DEVICE FOR HYDRAULIC CLASSIFICATION. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FI851763A FI80837C (en) | 1985-05-03 | 1985-05-03 | Hydraulic grading method and device |
FI851763 | 1985-05-03 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0222803A1 true EP0222803A1 (en) | 1987-05-27 |
EP0222803B1 EP0222803B1 (en) | 1989-10-04 |
Family
ID=8520770
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19860902838 Expired EP0222803B1 (en) | 1985-05-03 | 1986-05-05 | Hydraulic classifying procedure and means |
Country Status (8)
Country | Link |
---|---|
EP (1) | EP0222803B1 (en) |
JP (1) | JPS62502735A (en) |
AU (1) | AU596592B2 (en) |
DE (1) | DE3665996D1 (en) |
DK (1) | DK163644C (en) |
FI (1) | FI80837C (en) |
HU (1) | HU198405B (en) |
WO (1) | WO1986006653A1 (en) |
Families Citing this family (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB8630999D0 (en) * | 1986-12-30 | 1987-02-04 | Coal Industry Patents Ltd | Separation of granular solid material |
JPH0525717Y2 (en) * | 1987-04-06 | 1993-06-29 | ||
SE469279C (en) * | 1988-07-08 | 1997-10-20 | Nils Anders Lennart Wikdahl | Methods and apparatus for releasing a fiber suspension from light impurities |
US4927536A (en) * | 1989-03-21 | 1990-05-22 | Amoco Corporation | Hydrocyclone separation system |
US5180486A (en) * | 1989-11-28 | 1993-01-19 | Lsr Environmental Systems Company | Potential flow centrifugal separator system for removing solid particulates from a fluid stream |
US6530484B1 (en) * | 1999-11-18 | 2003-03-11 | Multotec Process Equipment (Proprietary) Ltd. | Dense medium cyclone separator |
EP1558352B1 (en) * | 2002-07-22 | 2010-09-29 | MBA Polymers, Inc. | Controlling media particle size in slurried dense media separations |
JP2005262080A (en) * | 2004-03-18 | 2005-09-29 | Fukuma Manabu | Cyclone device, preparatory revolving part used therefor, dust removing apparatus equipped with cyclone device and automobile |
ITGE20110049A1 (en) * | 2011-04-28 | 2012-10-29 | Ecomin S R L | METHOD AND EQUIPMENT FOR PARTICLE SEPARATION |
WO2013186751A1 (en) * | 2012-06-14 | 2013-12-19 | Multotec Process Equipment (Pty) Limited | Centrifugal separator arrangement and method |
CN106269315B (en) * | 2016-08-12 | 2019-01-01 | 华东理工大学 | Inlet particle sequence type cyclone |
CN106076672A (en) * | 2016-08-12 | 2016-11-09 | 华东理工大学 | Air-flowing type multi-product subparticle sequence clasfficiator |
CN109277212A (en) * | 2018-11-25 | 2019-01-29 | 威海市海王旋流器有限公司 | A kind of one section of underflow discharge device of three-product cyclone with on-line control function |
CN114260108B (en) * | 2021-12-27 | 2023-12-05 | 华北理工大学 | Multi-inlet special-shaped cyclone |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2799208A (en) * | 1955-04-29 | 1957-07-16 | Scott Harold Eric Baliol | Vortex type separators |
BE544291A (en) * | 1955-03-10 | 1900-01-01 | Horace Freeman | |
CA954564A (en) * | 1972-01-12 | 1974-09-10 | Anthony R. Barringer | Method and apparatus for transferrig particles from one fluid stream into another |
GB8327218D0 (en) * | 1983-10-12 | 1983-11-16 | Beloit Corp | Reject handling in cyclones &c |
-
1985
- 1985-05-03 FI FI851763A patent/FI80837C/en not_active IP Right Cessation
-
1986
- 1986-05-05 DE DE8686902838T patent/DE3665996D1/en not_active Expired
- 1986-05-05 HU HU863119A patent/HU198405B/en not_active IP Right Cessation
- 1986-05-05 JP JP50274186A patent/JPS62502735A/en active Pending
- 1986-05-05 EP EP19860902838 patent/EP0222803B1/en not_active Expired
- 1986-05-05 AU AU58648/86A patent/AU596592B2/en not_active Ceased
- 1986-05-05 WO PCT/FI1986/000045 patent/WO1986006653A1/en active IP Right Grant
- 1986-12-18 DK DK614886A patent/DK163644C/en not_active IP Right Cessation
Non-Patent Citations (1)
Title |
---|
See references of WO8606653A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE3665996D1 (en) | 1989-11-09 |
FI851763L (en) | 1986-11-04 |
DK163644B (en) | 1992-03-23 |
HUT45925A (en) | 1988-09-28 |
JPS62502735A (en) | 1987-10-22 |
DK614886A (en) | 1987-01-23 |
FI851763A0 (en) | 1985-05-03 |
AU596592B2 (en) | 1990-05-10 |
EP0222803B1 (en) | 1989-10-04 |
DK614886D0 (en) | 1986-12-18 |
AU5864886A (en) | 1986-12-04 |
FI80837B (en) | 1990-04-30 |
WO1986006653A1 (en) | 1986-11-20 |
FI80837C (en) | 1990-08-10 |
HU198405B (en) | 1989-10-30 |
DK163644C (en) | 1992-08-17 |
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