WO2013186751A1 - Dispositif séparateur centrifuge et procédé associé - Google Patents

Dispositif séparateur centrifuge et procédé associé Download PDF

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Publication number
WO2013186751A1
WO2013186751A1 PCT/IB2013/054880 IB2013054880W WO2013186751A1 WO 2013186751 A1 WO2013186751 A1 WO 2013186751A1 IB 2013054880 W IB2013054880 W IB 2013054880W WO 2013186751 A1 WO2013186751 A1 WO 2013186751A1
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WO
WIPO (PCT)
Prior art keywords
centrifugal separator
fraction
centrifugal
inlet
shaped
Prior art date
Application number
PCT/IB2013/054880
Other languages
English (en)
Inventor
Johan Andreas ENGELBRECHT
Original Assignee
Multotec Process Equipment (Pty) Limited
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Multotec Process Equipment (Pty) Limited filed Critical Multotec Process Equipment (Pty) Limited
Publication of WO2013186751A1 publication Critical patent/WO2013186751A1/fr

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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
    • B03B5/34—Applications of hydrocyclones
    • 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
    • B04C11/00—Accessories, e.g. safety or control devices, not otherwise provided for, e.g. regulators, valves in inlet or overflow ducting
    • 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
    • B04C5/00—Apparatus in which the axial direction of the vortex is reversed
    • B04C5/24—Multiple arrangement thereof
    • B04C5/26—Multiple arrangement thereof for series flow

Definitions

  • This invention relates to a centrifugal separator arrangement and method.
  • Centrifugal separators are widely used in the mineral processing industry to separate a feed of materials into at least two fractions according to the size or density of the materials.
  • the feed of materials may include solids, fluids or both.
  • Conventional centrifugal separators are either conically-shaped or cylindrically-shaped. These centrifugal separators include a cylindrical inlet section into which the materials are fed tangentially through an inlet. As a result, a circular motion is imparted to the materials which will cause larger and/or heavier materials to migrate outwardly towards the inner wall of the separator and exit the separator through a first outlet. Smaller and/or lighter materials, on the other hand, will move inwardly and exit the separator through a second outlet.
  • centrifugal separator arrangement consisting of two centrifugal separators connected in series so that a fraction of materials exiting a first or primary centrifugal separator enters a second or secondary centrifugal separator for further separation of the fraction of materials.
  • the first centrifugal separator separates the materials it receives at a first set size and/or density.
  • the second centrifugal separator separates the fraction of materials it receives at a second set size and/or density, which may be similar or different to that of the first centrifugal separator.
  • Such a centrifugal separator arrangement is generally known as a three-product centrifugal separator since three or more products or fraction are obtained from the feed of materials.
  • a disadvantage associated with the three-product centrifugal separator arrangement described above is that it is difficult to independently control the separation process of the second or secondary centrifugal separator in terms of the density or size of the materials.
  • centrifugal separator arrangement comprising:
  • an auxiliary inlet located between the outlet of the first centrifugal separator and the inlet of the second centrifugal separator through which a control material is added to control one or more characteristics of the first fraction of material selected from pressure, density and volumetric flow rate of the first fraction of material.
  • a conduit may connect the outlet of the first centrifugal separator to the inlet of the second centrifugal separator and define the auxiliary inlet intermediate the first and second centrifugal separators.
  • the conduit may include a first optional control valve for controlling the rate of discharge of the first fraction of material.
  • the control material may be added through the auxiliary inlet by means of gravity, or through mechanical means, including a pump.
  • the auxiliary inlet may be defined by at least one of a t-piece, mixing chamber and nozzle.
  • the nozzle may be a fixed nozzle or adjustable.
  • the control material may be at least one of a fluid and a combination of a fluid and solid material.
  • the fluid may be water and the solid material may be magnetite or ferrosilicon.
  • the centrifugal separator arrangement may also include a sensing device for sensing at least one or more of the pressure, density and volumetric flow rate of the first fraction of material.
  • the auxiliary inlet may be one of a plurality of auxiliary inlets located between the outlet of the first centrifugal separator and the inlet of the second centrifugal separator.
  • Each of the plurality of auxiliary inlets may be defined by at least one of a t-piece, mixing chamber and nozzle.
  • the nozzle may be a fixed nozzle or adjustable.
  • the first centrifugal separator may be either conically-shaped or cylindrically-shaped.
  • the second centrifugal separator may be either conically-shaped or cylindrically-shaped.
  • control material may be added through an auxiliary inlet defined in a conduit which is used for conveying the first fraction of material from the outlet of the first centrifugal separator to the inlet of the second centrifugal separator.
  • the control material may be added by means of gravity, or through mechanical means, including a pump.
  • the auxiliary inlet may be defined by at least one of a t-piece, mixing chamber and nozzle.
  • the nozzle may be a fixed nozzle or adjustable.
  • the control material may be at least one of a fluid and a combination of a fluid and solid material.
  • the fluid may be water and the solid material may be magnetite or ferrosilicon.
  • the method may also include the step of providing a first optional control valve intermediate the outlet of the first centrifugal separator and the inlet of the second centrifugal separator for controlling the rate of discharge of the first fraction of material.
  • the method may include the further step of sensing at least one of the pressure, density and volumetric flow rate of the first fraction of material.
  • the auxiliary inlet may be one of a plurality of auxiliary inlets located between the outlet of the first centrifugal separator and the inlet of the second centrifugal separator.
  • Each of the plurality of auxiliary inlets may be defined by at least one of a t-piece, mixing chamber and nozzle.
  • the nozzle may be a fixed nozzle or adjustable.
  • the first centrifugal separator may be either conically-shaped or cylindrically-shaped.
  • the second centrifugal separator may be either conically-shaped or cylindrically-shaped.
  • FIG. 1 is a schematic side view of a centrifugal separator arrangement according to a first embodiment of the invention wherein first and second centrifugal separators are conically- shaped and wherein a control material is added to a first fraction of material through an auxiliary inlet by means of a pump; is a detail cross-sectional view of the auxiliary inlet of figure 1 , wherein the auxiliary inlet is in the form of a t-piece; is a detail cross-sectional view of the auxiliary inlet of figure 1 , wherein the auxiliary inlet is in the form of a nozzle; is a detail side view of the auxiliary inlet in figure 1 , wherein the auxiliary inlet is in the form of a mixing chamber; is a schematic side view of a centrifugal separator arrangement according to a second embodiment of the invention wherein control
  • centrifugal separator arrangement for use in a centrifugal separation process including, but not limited to dense medium separation, classification and liquid-liquid separation, is generally indicated by reference numeral 10.
  • the separator arrangement 10 comprises a first centrifugal separator, in the form of a conical separator 12, and a second centrifugal separator, also in the form of a conical separator 14.
  • the centrifugal separators 12 and 14 are connected in series by means of a conduit 16 so that, in use, a first fraction of material (flow indicated by arrow A) that discharges from an outlet 18 of the first conical separator 12 enters an inlet 20 of the second conical separator 14.
  • a first optional control valve 22 is provided on the conduit 16 for controlling the rate of discharge of the first fraction of material A from the first centrifugal separator 12. It is envisaged that the first optional control valve 22 does not have to be included in all the embodiments of the invention.
  • the conduit 16 defines an auxiliary inlet 24 intermediate the first and second centrifugal separators 12 and 14 through which, in use, a control material (flow indicated by arrow B) is added to control one or more characteristics of the first fraction of material A selected from pressure, density and volumetric flow rate of the first fraction of material A.
  • a control material flow indicated by arrow B
  • the control material B is added through mechanical means, by using a pump 26.
  • a second optional control valve 28 is provided adjacent the auxiliary inlet 24 for controlling the rate of addition of the control material B.
  • the rate of addition of the control material B by the pump 26 is dependent on any one of the pressure, density and volumetric flow rate of the first fraction of material A.
  • the pressure, density and volumetric flow rate of the first fraction of material A could thus be manipulated through the addition of the control material B to it.
  • the control material B could be either a fluid, such as water, or it could be a combination of a fluid, such as water and a solid material, such as magnetite or ferrosilicon.
  • the auxiliary inlet 24 could be defined by a t- piece (figure 2), nozzle (figure 3) and mixing chamber (figure 4).
  • the nozzle shown in figure 3 is a fixed nozzle, although it is foreseen that the nozzle could also be adjustable.
  • the separator arrangement 10 further includes a sensing device 30 connected to the conduit 16 for sensing at least one or more of the pressure, density or volumetric flow rate of the first fraction of material A in the conduit 16. Any deviation in the sensed pressure, density or volumetric flow rate from the required will be communicated to the pump 26 or second optional control valve 28, or both, which will perform accordingly to counteract such deviation .
  • the sensing device 30 could be placed at any location along the length of the conduit 16. In this instance the sensing device 30 is located between the auxiliary inlet 24 and the inlet 18, but it could be located before the auxiliary inlet 24 on the conduit 16. As discussed further below, it is also envisaged that more than one sensing device 30 could also be used.
  • the first conical separator 12 receives through an inlet 32 a feed of raw material (flow indicated by the arrow C), such as coal, for example, which is to be separated centrifugally according to size and/or density.
  • raw material such as coal, for example
  • the feed material may be a fluid, or a combination of a fluid and solid material.
  • a circular motion is imparted to the feed material C as a result of the position and orientation of the inlet 32 on the first centrifugal separator 12.
  • the first fraction of material A which comprises larger and/or heavier materials will migrate outwardly and exit the conical separator 12 through outlet 18, which outlet 18 is at a general tangential angle relative to the separator 12.
  • a second fraction of materials which comprises generally smaller and/or lighter materials will move inwardly and exit the separator 12 through a second outlet 34, as indicated by the arrow D.
  • the separator 12 is designed and controlled so that materials of a pre-determined size and/or density will exit through the outlet 18, and materials of a different pre-determined size and/or density will exit through the second outlet 34.
  • the volumetric flow rate, pressure and/or density of the materials exiting through outlets 1 8 and 34 could differ.
  • the control material B is added to the first fraction of material A so to control the volumetric flow rate, pressure and/or density thereof in the conduit 16.
  • the addition of the control material B is advantageous in that it allows for the control of the second separator 14 without affecting the first separator 12 within certain limits. This also improves the efficiency of the second separator 14.
  • the material received by the second centrifugal separator 14 are further separated and discharged in two fractions through outlets 36 and 38 respectively, indicated by arrows E and F in figure 1.
  • auxiliary inlet 24 is one of two or a plurality of auxiliary inlets 24 which are spaced along the length of the conduit 16.
  • Each of the plurality of auxiliary inlets 24 could be defined by at least one of the t-piece, nozzle and mixing chamber, shown in figures 2 to 4 and discussed above.
  • a further first optional control valve 22 sensing device 30 are provided in the conduit 16. It should be appreciated that amount and positions of the control valves 22 and sensing devices 30 are merely provided as an example, and should not be construed to limit the scope of the invention.
  • control valves 22 and sensing devices 30 could be used, and if used, could be positioned at any location along the conduit 16.
  • auxiliary inlet 24 is especially useful for regulating the pressure in the conduit 16, and in particular at the outlet 18 of the first separator 12 and inlet 20 of the second separator 14.
  • control material B by adding the control material B by means of a t-piece only could result in a back pressure being created at the outlet 18 of the first separator 12.
  • adding the control material B by means of a nozzle only could create a suction at the outlet 18 of the first separator 12.
  • auxiliary inlets 24 in series, for example one being a t-piece and the other a nozzle, and by selectively discharging the control material B through the respective inlets 24, the pressure inside the conduit 16 could relatively easily and effectively be manipulated.
  • the t-piece shown in figure 2 is not limited to the configuration shown and could, for example, also extend to a t-piece having an angled side arm. This form of a t-piece would reduce the amount of back pressure being created.
  • FIG 6 it illustrates a third embodiment of the centrifugal separator arrangement 10.
  • This third embodiment of the invention is constructed the same and functions the same as the first embodiment shown in figures 1 to 4 and described above, save for the omission of the pump 26 and the location of the measuring device 30 on the conduit 16.
  • the control material B is stored in a vessel, container or receptacle 40 located at a position which is higher than inlet 24, The control material B is fed by means of gravity through the auxiliary inlet 24.
  • the sensing device 30 located, for example, between the outlet 18 and the auxiliary inlet 24, the pressure, density or volumetric flow rate of the first fraction of material A could be sensed before it passes the auxiliary inlet 24.
  • the measurement is then used, similarly as explained above, to determine the rate of addition of control material, if any needs to be added.
  • more than one sensing devices can be used to independently control the two separators 12 and 14.
  • a fourth embodiment of the centrifugal separator arrangement 10 is shown in figure 7, wherein the conically-shaped first centrifugal separator 12 of the first embodiment of the invention, shown in figure 1 , is merely substituted with a cylindrically-shaped separator 42.
  • FIG 8 it shows a fifth embodiment of the centrifugal separator arrangement 10 which is same as the third embodiment of the invention, shown in figure 6, save for the substitution of the conically- shaped first centrifugal separator 12 with a cylindrically-shaped separator 42 and the position of the sensing device 30 on the conduit 16. It is envisaged that more than one sensing device 30 could also be used.
  • a sixth embodiment of the centrifugal separator arrangement 10 is similar to the first embodiment of the invention, shown in figure 1 , save for the substitution of the conically-shaped second centrifugal separator 14 with a cylindrically-shaped separator 44.
  • a seventh embodiment of the centrifugal separator arrangement 10, shown in figure 10 which, is similar to the third embodiment of the invention, shown in figure 6, save for the substitution of the conically- shaped second centrifugal separator 14 with a cylindrically-shaped separator 44 and the position of the sensing device 30 on the conduit 16. It is envisaged that more than one sensing device 30 could also be used.
  • FIG 1 1 it shows an eighth embodiment of the centrifugal separator arrangement 10.
  • the eighth embodiment of the invention is the same as the first embodiment of the invention, shown in figure 1 , save for the substitution of both conically-shaped first and second centrifugal separators 12 and 14 with cylindrically-shaped separators 42 and 44.
  • a ninth embodiment of the centrifugal separator arrangement 10 is similar to the third embodiment of the invention, shown in figure 6, save for the substitution of both conically- shaped first and second centrifugal separators 12 and 14 with cylindrically- shaped separators 42 and 44 and the position of the sensing device 30 on the conduit 16.
  • Figure 13 shows a tenth embodiment of the centrifugal separator arrangement 10.
  • the tenth embodiment of the invention is the same as the fourth embodiment of the invention, shown in figure 7, except for the substitution of the cylindrically-shaped first centrifugal separator 42 with a different cylindrically-shaped separator 46 having two inlets 32 and 33 and two outlets 18 and 34.
  • FIG 14 it shows an eleventh embodiment of the centrifugal separator arrangement 10.
  • the eleventh embodiment of the invention is the same as the fifth embodiment of the invention, shown in figure 8, save for the substitution of the cylindrically-shaped first centrifugal separator 42 with a different cylindrically-shaped separator 46 having two inlets 32 and 33 and two outlets 18 and 34.
  • a twelfth embodiment of the centrifugal separator arrangement 10, shown in figure 15, is similar to the sixth embodiment of the invention, shown in figure 9, save for the substitution of the conically-shaped first centrifugal separator 12 with a cylindrically-shaped separator 46 having two inlets 32 and 33 and two outlets 18 and 34.
  • FIG 16 shows a thirteenth embodiment of the centrifugal separator arrangement 10.
  • the thirteenth embodiment of the invention is the same as the seventh embodiment of the invention, shown in figure 10, save for the substitution of the conicaliy-shaped first centrifugal separator 12 with a cylindrically-shaped separator 46 having two inlets 32 and 33 and two outlets 18 and 34.
  • centrifugal separator arrangement 10 described herein will improve the efficiency of the second centrifugal separator 14 and 44. Also, with the centrifugal separator arrangement 10 described herein, it will be easier to independently control the second centrifugal separator 14 and 44 in terms of the material's density and/or size without affecting the first separator 12, 42 and 46 within certain limits. It will be appreciated by those skilled in the art that the invention is not limited to the precise details as described herein and that many variations are possible without departing from the scope of the invention.
  • the outlet 36 of the second centrifugal separator 14 does not necessarily have to be in an axial direction relative to the separator 14, but could also be angled tangentially.
  • the separator arrangement 10 may also include more than two centrifugal separators arranged in series. Further, the separator arrangement 10 may also be configured so that the second centrifugal separator 14 and 38 is connectable to the outlet 34 of the first centrifugal separator 12, 42 and 46 so that material exiting through the outlet 34 enters the inlet 20.
  • the separator arrangement 10 may also, for instance, include two second centrifugal separators 14 and 44 connectable to the first centrifugal separator 12, 42 and 46 and configured so that material exiting outlets 18 and 34 enters the inlet 20 of the second centrifugal separators 14 and 44.
  • the location and quantity of the sensing device 30 as depicted in figures 1 and 5 to 16 are not limited to those specific locations shown and may be located anywhere along the length of the conduit 16.

Landscapes

  • Cyclones (AREA)
  • Centrifugal Separators (AREA)

Abstract

L'invention concerne un dispositif séparateur centrifuge (10) utilisé dans le cadre d'un processus de séparation centrifuge. Le dispositif séparateur comprend un premier séparateur centrifuge (12) et un second séparateur centrifuge (14) connecté au premier séparateur centrifuge (12). Selon l'invention, une première fraction de matériau A sortant d'un orifice de sortie (18) du premier séparateur centrifuge (12) pénètre dans un orifice d'entrée (20) du second séparateur centrifuge (14). Un orifice d'entrée auxiliaire (24) est situé entre l'orifice de sortie (18) et l'orifice d'entrée (20). Un matériau de commande B est ajouté à travers cet orifice d'entrée auxiliaire pour commander une ou plusieurs caractéristiques de la première fraction de matériau A, caractéristique choisie parmi la pression, la densité et le débit volumétrique de la première fraction de matériau A. Le matériau de commande B est au moins un élément parmi un fluide, tel que de l'eau, et une combinaison d'un fluide, tel que de l'eau, et d'un matériau solide, tel que de la magnétite ou du ferrosilicium.
PCT/IB2013/054880 2012-06-14 2013-06-14 Dispositif séparateur centrifuge et procédé associé WO2013186751A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
ZA2012/04368 2012-06-14
ZA201204368 2012-06-14
ZA201301666 2013-03-05
ZA2013/01666 2013-03-05

Publications (1)

Publication Number Publication Date
WO2013186751A1 true WO2013186751A1 (fr) 2013-12-19

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Application Number Title Priority Date Filing Date
PCT/IB2013/054880 WO2013186751A1 (fr) 2012-06-14 2013-06-14 Dispositif séparateur centrifuge et procédé associé

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WO (1) WO2013186751A1 (fr)
ZA (1) ZA201304412B (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112058479A (zh) * 2020-09-03 2020-12-11 中国矿业大学 一种三产品重介质旋流器二段分选密度调控装置及方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1130339A (en) * 1965-01-26 1968-10-16 Coal Industry Patents Ltd Mineral separation
WO1986006653A1 (fr) * 1985-05-03 1986-11-20 Larox Oy Procede et appareil de tri hydraulique
GB2199518A (en) * 1986-12-30 1988-07-13 Coal Ind Separation of granular solid material
CN101590452B (zh) * 2009-02-27 2010-09-08 太原理工大学 双涡自回流分级旋流器

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1130339A (en) * 1965-01-26 1968-10-16 Coal Industry Patents Ltd Mineral separation
WO1986006653A1 (fr) * 1985-05-03 1986-11-20 Larox Oy Procede et appareil de tri hydraulique
GB2199518A (en) * 1986-12-30 1988-07-13 Coal Ind Separation of granular solid material
CN101590452B (zh) * 2009-02-27 2010-09-08 太原理工大学 双涡自回流分级旋流器

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112058479A (zh) * 2020-09-03 2020-12-11 中国矿业大学 一种三产品重介质旋流器二段分选密度调控装置及方法

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