WO2007054912A1 - A de-watering apparatus - Google Patents

A de-watering apparatus Download PDF

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Publication number
WO2007054912A1
WO2007054912A1 PCT/IB2006/054197 IB2006054197W WO2007054912A1 WO 2007054912 A1 WO2007054912 A1 WO 2007054912A1 IB 2006054197 W IB2006054197 W IB 2006054197W WO 2007054912 A1 WO2007054912 A1 WO 2007054912A1
Authority
WO
WIPO (PCT)
Prior art keywords
funnel
wall
watering apparatus
bin portion
bin
Prior art date
Application number
PCT/IB2006/054197
Other languages
French (fr)
Inventor
Robert Cooke
Bruce James Souter
Original Assignee
Paterson & Cooke Consulting Engineers (Proprietary) 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 Paterson & Cooke Consulting Engineers (Proprietary) Limited filed Critical Paterson & Cooke Consulting Engineers (Proprietary) Limited
Publication of WO2007054912A1 publication Critical patent/WO2007054912A1/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/02—Settling tanks with single outlets for the separated liquid
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/0039—Settling tanks provided with contact surfaces, e.g. baffles, particles
    • B01D21/0042—Baffles or guide plates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/24—Feed or discharge mechanisms for settling tanks
    • B01D21/2405—Feed mechanisms for settling tanks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/24—Feed or discharge mechanisms for settling tanks
    • B01D21/2427—The feed or discharge opening located at a distant position from the side walls

Definitions

  • THIS INVENTION relates to a de-watering apparatus. More specifically, the invention relates to a de-watering apparatus for removing excess water from a process stream containing water and granular material, for example diamond-containing marine gravel.
  • a de-watering apparatus for removing excess water from a process stream including water and granular material, the de- watering apparatus including
  • a bin including an upper bin portion, which includes a funnel-shaped outer wall and which defines at its top end a mouth, and a lower bin portion, defined by an outer wall which defines at its bottom end a discharge opening; and
  • a funnel defining at its top end a mouth for receiving a process stream containing water and granular material and defining at its bottom end a discharge opening for discharging the process stream into the lower bin portion
  • the funnel is at least partially located in the upper bin portion in a configuration in which a flow passage is defined between the funnel and the funnel-shaped outer wall of the upper bin portion to provide for flow of water discharged from the discharge opening of the funnel via the flow passage and out via a portion of the mouth of the upper bin portion outside the funnel;
  • the lower bin portion provides for collection therein of granular material from the process stream
  • the discharge opening of the lower bin portion provides for discharge of the granular material from the bin.
  • the funnel-shaped outer wall of the upper bin portion of the de-watering apparatus may have an inverted frusto-conical configuration.
  • the funnel of the de-watering apparatus may include an inverted frusto-conical configuration outer wall that is coaxial with the funnel-shaped outer wall of the upper bin portion.
  • the level of the funnel may be adjustable relative to the level of the bin so as to adjust the flow cross-sectional area of the flow passage defined between the funnel and the funnel-shaped outer wall of the upper bin portion.
  • the funnel of the de-watering apparatus may be removable to permit it to be interchanged with a different configuration funnel which will yield a different configuration of the flow passage defined between the funnel and the funnel-shaped outer wall of the upper bin portion.
  • the de-watering apparatus may include an open-topped receptacle at the top of the funnel for receiving the process stream and providing for the process stream to overflow therefrom into the funnel.
  • the de-watering apparatus may include, disposed around the mouth defined by the funnel-shaped outer wall defining the upper bin portion, a launder for collecting water discharged from the flow passage defined between the funnel and the funnel-shaped outer wall of the upper bin portion.
  • the de-watering apparatus may include extraction means for extracting water and granular material from the discharge opening of the lower bin portion.
  • Figure 1 shows a schematic plan view of a de-watering apparatus in accordance with the invention
  • Figure 2 shows a schematic sectional elevation of the de-watering apparatus of Figure 1 along the section line N-Il of Figure 1 , with a funnel thereof at a first level relative to the bin;
  • Figure 3 shows a schematic sectional elevation of the de-watering apparatus of Figure 1 along the section line N-Il of Figure 1 , with the funnel at a second level relative to the bin.
  • a de-watering apparatus for removing excess water from a process stream containing water and granular material is designated generally by the reference numeral 10.
  • the de-watering apparatus 10 is specifically configured for use in alluvial diamond mining operations for extracting water from a process stream including water and diamond-containing marine gravel.
  • the apparatus 10 includes a bin 12 and a funnel 14 that is removably mounted on the bin.
  • the bin 12 has a top end 16 and a bottom end 18 that defines a discharge opening 20 for marine gravel 21 .
  • the bin 12 includes an upper bin portion 22, defined by a funnel- shaped, particularly an inverted frusto-conical configuration, outer wall 24 that defines at its top end a mouth 25.
  • the bin 12 includes also a lower bin portion 26 in which partially de-watered marine gravel 21 collects, in use.
  • the lower bin portion 26 includes an upper portion defined by a cylindrical outer wall 28, which is connected to a lower end of the wall 24, and a lower portion defined by an inverted frusto-conical configuration outer wall 30, which defines the discharge opening 20 at its bottom end.
  • Extraction means in the form of an extraction pump can be connected in communication with the discharge opening 20 via a flange 31 around the discharge opening for assisting in the extraction of water and marine gravel from the bin 12.
  • a pump may form part of the de-watering apparatus and insofar as the pump may be conventional, it is not described or illustrated herein.
  • the funnel 14 includes an inverted frusto-conical configuration outer wall 32 which is disposed on the inside of, coaxial with, and spaced apart from the wall 24 of the bin 12, thereby to define an annular horizontal cross-section flow passage 34 between the walls 32 and 24 along which water to be discharged from the bin can flow, in use.
  • the funnel 14 further includes a lower cylindrical throat 36 which is connected to the bottom end of the wall 32 and which extends into the portion of the bin 12 defined by the wall 28.
  • the passage 34 particularly provides for flow of water discharged from the discharge opening of the throat 36 via the passage and out via the portion of the mouth 25 around the funnel 14.
  • the apparatus 10 includes an open-topped receptacle in the form of a weir box 37 which defines a peripheral weir and which is centrally located at an upper end of the funnel 14 and into which the process stream is introduced prior to entering the bin 12, in use.
  • the apparatus 10 further includes an annular launder 38, which has a discharge pipe 40, at the upper end 16 of the bin, disposed around the mouth 25, for collecting extracted water which is discharged from the bin, in use.
  • the funnel 14 is mounted on the bin 12 via mounting means including a three pairs of overlapping baffle plates 42, of which only one plate is partially shown, at equal angular spacing around the axis of the bin 12.
  • the plates in each pair are welded to the inside of the wall 24 and the outside of the wall 32, respectively, in an orientation in which a plane defined between the plates includes the axis of radial symmetry of the funnel.
  • the plates in each pair are releasably secured to each other via bolt and nut combinations (not shown) in a configuration permitting their overlap to be adjusted to thereby adjust the level of the funnel 14 relative to the level of the bin 12, thereby to alter the flow cross- sectional area of the flow passage 34.
  • the funnel 14 is shown in a configuration wherein it is disposed at a higher level than its level shown in Figure 2 of the drawings, thereby increasing the flow cross- sectional area of the flow passage 34.
  • the shape and configuration of the funnel and of the bin may vary greatly while still incorporating the essential features of the invention.
  • the outer wall of the funnel may have a triangular or rectangular configuration in plan view.
  • the funnel-shaped outer wall of the bin may have a complementary triangular or rectangular configuration in plan view.
  • the invention extends to all variations de-watering apparatus including the essential features of a de-watering apparatus as defined herein.
  • a process stream including water and marine gravel is introduced into the weir box 37, from where it flows over the peripheral weir defined by the box and into the funnel 14.
  • the weir box 37 counters surging of the process stream, causing the process stream to enter the funnel 14 in a substantially uniformly distributed manner.
  • some settling of marine gravel occurs along the inner surface of the wall 32 as the process stream is funnelled towards the throat 36 of the funnel.
  • Heavier gravel particles are deposited in the portion of the bin 12 defined by the wall 30.
  • Water exiting the funnel 14 is directed upwards towards the flow passage 34.
  • the arrows in Figures 2 and 3 indicate the flow direction of the process stream.
  • the flow cross-sectional area of the flow passage 34 can be adjusted, thereby adjusting the performance characteristics of the apparatus 10.
  • the amount of gravel particles carried upwards along the flow passage 34 is dependent upon the velocity of the water flowing upwards through the flow passage 34. Hence, for a given flow rate, the portion of the gravel that is transported by the water to the overflow launder 38 is a function of the flow cross-sectional area of the flow passage 34.
  • the funnel 14 can be interchanged with another funnel having a different configuration, for example particularly one having a different cone angle of its inverted frusto-conical wall.
  • the de-watering apparatus may be configured so that, in use, the flow velocity of water flowing upwards through the passage 34 decreases from bottom to top, remains substantially constant, or increases.
  • the portion of gravel deposited in the launder 38 may be controlled.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Separation Of Solids By Using Liquids Or Pneumatic Power (AREA)

Abstract

This invention relates to a de-watering apparatus for removing excess water from a process stream containing water and granular material. The apparatus includes a bin (12), including an upper bin portion (22), which includes a funnel-shaped outer wall (24) and which defines at its top end a mouth (25), and a lower bin portion (26), defined by an outer wall (28) which defines at its bottom end a discharge opening (20). It includes also a funnel (14) and flow passage (34) is defined between the funnel (14) and the funnel-shaped outer wall (24) of the upper bin portion (22). In use of the apparatus, a process stream is fed into the funnel and granular material (21) from the stream is collected in the lower bin portion (26) for extraction via the discharge opening (20). Excess water flows via the flow passage (34) and out of the bin via the portion (38) of the mouth of the bin outside the funnel.

Description

A DE-WATERING APPARATUS
THIS INVENTION relates to a de-watering apparatus. More specifically, the invention relates to a de-watering apparatus for removing excess water from a process stream containing water and granular material, for example diamond-containing marine gravel.
SUMMARY OF INVENTION
According to the invention there is provided a de-watering apparatus for removing excess water from a process stream including water and granular material, the de- watering apparatus including
a bin including an upper bin portion, which includes a funnel-shaped outer wall and which defines at its top end a mouth, and a lower bin portion, defined by an outer wall which defines at its bottom end a discharge opening; and
a funnel defining at its top end a mouth for receiving a process stream containing water and granular material and defining at its bottom end a discharge opening for discharging the process stream into the lower bin portion,
in which the funnel is at least partially located in the upper bin portion in a configuration in which a flow passage is defined between the funnel and the funnel-shaped outer wall of the upper bin portion to provide for flow of water discharged from the discharge opening of the funnel via the flow passage and out via a portion of the mouth of the upper bin portion outside the funnel;
the lower bin portion provides for collection therein of granular material from the process stream; and
the discharge opening of the lower bin portion provides for discharge of the granular material from the bin.
The funnel-shaped outer wall of the upper bin portion of the de-watering apparatus may have an inverted frusto-conical configuration. In this case, the funnel of the de-watering apparatus may include an inverted frusto-conical configuration outer wall that is coaxial with the funnel-shaped outer wall of the upper bin portion.
In the de-watering apparatus, the level of the funnel may be adjustable relative to the level of the bin so as to adjust the flow cross-sectional area of the flow passage defined between the funnel and the funnel-shaped outer wall of the upper bin portion.
The funnel of the de-watering apparatus may be removable to permit it to be interchanged with a different configuration funnel which will yield a different configuration of the flow passage defined between the funnel and the funnel-shaped outer wall of the upper bin portion.
The de-watering apparatus may include an open-topped receptacle at the top of the funnel for receiving the process stream and providing for the process stream to overflow therefrom into the funnel. The de-watering apparatus may include, disposed around the mouth defined by the funnel-shaped outer wall defining the upper bin portion, a launder for collecting water discharged from the flow passage defined between the funnel and the funnel-shaped outer wall of the upper bin portion.
The de-watering apparatus may include extraction means for extracting water and granular material from the discharge opening of the lower bin portion.
BRIEF DESCRIPTION OF THE DRAWINGS
Further features of the invention are described hereinafter by way of a non-limiting example of the invention, with reference to and as illustrated in the accompanying diagrammatic drawings. In the drawings:
Figure 1 shows a schematic plan view of a de-watering apparatus in accordance with the invention;
Figure 2 shows a schematic sectional elevation of the de-watering apparatus of Figure 1 along the section line N-Il of Figure 1 , with a funnel thereof at a first level relative to the bin; and
Figure 3 shows a schematic sectional elevation of the de-watering apparatus of Figure 1 along the section line N-Il of Figure 1 , with the funnel at a second level relative to the bin.
DESCRIPTION OF PREFERRED EMBODIMENTS With reference to the drawings, a de-watering apparatus for removing excess water from a process stream containing water and granular material is designated generally by the reference numeral 10. The de-watering apparatus 10 is specifically configured for use in alluvial diamond mining operations for extracting water from a process stream including water and diamond-containing marine gravel.
The apparatus 10 includes a bin 12 and a funnel 14 that is removably mounted on the bin.
The bin 12 has a top end 16 and a bottom end 18 that defines a discharge opening 20 for marine gravel 21 . The bin 12 includes an upper bin portion 22, defined by a funnel- shaped, particularly an inverted frusto-conical configuration, outer wall 24 that defines at its top end a mouth 25. The bin 12 includes also a lower bin portion 26 in which partially de-watered marine gravel 21 collects, in use. The lower bin portion 26 includes an upper portion defined by a cylindrical outer wall 28, which is connected to a lower end of the wall 24, and a lower portion defined by an inverted frusto-conical configuration outer wall 30, which defines the discharge opening 20 at its bottom end. Extraction means in the form of an extraction pump (not shown) can be connected in communication with the discharge opening 20 via a flange 31 around the discharge opening for assisting in the extraction of water and marine gravel from the bin 12. Such a pump may form part of the de-watering apparatus and insofar as the pump may be conventional, it is not described or illustrated herein.
The funnel 14 includes an inverted frusto-conical configuration outer wall 32 which is disposed on the inside of, coaxial with, and spaced apart from the wall 24 of the bin 12, thereby to define an annular horizontal cross-section flow passage 34 between the walls 32 and 24 along which water to be discharged from the bin can flow, in use.
The funnel 14 further includes a lower cylindrical throat 36 which is connected to the bottom end of the wall 32 and which extends into the portion of the bin 12 defined by the wall 28. The passage 34 particularly provides for flow of water discharged from the discharge opening of the throat 36 via the passage and out via the portion of the mouth 25 around the funnel 14.
The apparatus 10 includes an open-topped receptacle in the form of a weir box 37 which defines a peripheral weir and which is centrally located at an upper end of the funnel 14 and into which the process stream is introduced prior to entering the bin 12, in use.
The apparatus 10 further includes an annular launder 38, which has a discharge pipe 40, at the upper end 16 of the bin, disposed around the mouth 25, for collecting extracted water which is discharged from the bin, in use.
The funnel 14 is mounted on the bin 12 via mounting means including a three pairs of overlapping baffle plates 42, of which only one plate is partially shown, at equal angular spacing around the axis of the bin 12. The plates in each pair are welded to the inside of the wall 24 and the outside of the wall 32, respectively, in an orientation in which a plane defined between the plates includes the axis of radial symmetry of the funnel. The plates in each pair are releasably secured to each other via bolt and nut combinations (not shown) in a configuration permitting their overlap to be adjusted to thereby adjust the level of the funnel 14 relative to the level of the bin 12, thereby to alter the flow cross- sectional area of the flow passage 34. In order to illustrate this feature, in Figure 3 of the drawings, the funnel 14 is shown in a configuration wherein it is disposed at a higher level than its level shown in Figure 2 of the drawings, thereby increasing the flow cross- sectional area of the flow passage 34.
It will be appreciated that the shape and configuration of the funnel and of the bin may vary greatly while still incorporating the essential features of the invention. For example, the outer wall of the funnel may have a triangular or rectangular configuration in plan view. Similarly, the funnel-shaped outer wall of the bin may have a complementary triangular or rectangular configuration in plan view. As such, the invention extends to all variations de-watering apparatus including the essential features of a de-watering apparatus as defined herein.
In use, a process stream including water and marine gravel is introduced into the weir box 37, from where it flows over the peripheral weir defined by the box and into the funnel 14. The weir box 37 counters surging of the process stream, causing the process stream to enter the funnel 14 in a substantially uniformly distributed manner. In the funnel 14, some settling of marine gravel occurs along the inner surface of the wall 32 as the process stream is funnelled towards the throat 36 of the funnel. Heavier gravel particles are deposited in the portion of the bin 12 defined by the wall 30. A degree of turbulent flow of the process stream within the portion of the bin 12 defined by the wall
28 causes finer gravel particles to be washed out of the heavier particles.
Water exiting the funnel 14 is directed upwards towards the flow passage 34. The arrows in Figures 2 and 3 indicate the flow direction of the process stream. By adjusting the level of the funnel 14 relative to the bin 12, the flow cross-sectional area of the flow passage 34 can be adjusted, thereby adjusting the performance characteristics of the apparatus 10. The amount of gravel particles carried upwards along the flow passage 34 is dependent upon the velocity of the water flowing upwards through the flow passage 34. Hence, for a given flow rate, the portion of the gravel that is transported by the water to the overflow launder 38 is a function of the flow cross-sectional area of the flow passage 34.
Clearly, with the cone angle of the walls 24 and 34 being the same, the flow cross- sectional area of the flow passage 34 defined between them increases from bottom to top and the flow velocity of water flowing upwards through the passage decreases from bottom to top. The applicant envisages that the funnel 14 can be interchanged with another funnel having a different configuration, for example particularly one having a different cone angle of its inverted frusto-conical wall. As such, by suitable selection of the cone angle of the inverted frusto-conical wall of the funnel and suitable adjustment of the level of the funnel relative to the bin 12, the de-watering apparatus may be configured so that, in use, the flow velocity of water flowing upwards through the passage 34 decreases from bottom to top, remains substantially constant, or increases. As such, the portion of gravel deposited in the launder 38 may be controlled.

Claims

1. A de-watering apparatus for removing excess water from a process stream including water and granular material, the de-watering apparatus including
a bin including an upper bin portion, which includes a funnel-shaped outer wall and which defines at its top end a mouth, and a lower bin portion, defined by an outer wall which defines at its bottom end a discharge opening; and
a funnel defining at its top end a mouth for receiving a process stream containing water and granular material and defining at its bottom end a discharge opening for discharging the process stream into the lower bin portion,
in which
the funnel is at least partially located in the upper bin portion in a configuration in which a flow passage is defined between the funnel and the funnel-shaped outer wall of the upper bin portion to provide for flow of water discharged from the discharge opening of the funnel via the flow passage and out via a portion of the mouth of the upper bin portion outside the funnel;
the lower bin portion provides for the collection therein of granular material from the process stream; and
the discharge opening of the lower bin portion provides for discharge of the granular material from the bin.
2. A de-watering apparatus as claimed in claim 1 , in which the funnel-shaped outer wall of the upper bin portion has an inverted frusto-conical configuration.
3. A de-watering apparatus as claimed in claim 2, in which the funnel includes an inverted frusto-conical configuration outer wall that is coaxial with the funnel- shaped outer wall of the upper bin portion.
4. A de-watering apparatus as claimed in any one of the preceding claims, in which the level of the funnel is adjustable relative to the level of the bin so as to adjust the flow cross-sectional area of the flow passage defined between the funnel and the funnel-shaped outer wall of the upper bin portion.
5. A de-watering apparatus as claimed in any one of the preceding claims, in which the funnel is removable to permit it to be interchanged with a different configuration funnel which will yield a different configuration of the flow passage defined between the funnel and the funnel-shaped outer wall of the upper bin portion.
6. A de-watering apparatus as claimed in any one of the preceding claims, which includes an open-topped receptacle at the top of the funnel for receiving the process stream and providing for the process stream to overflow therefrom into the funnel.
7. A de-watering apparatus as claimed in any one of the preceding claims, which includes, disposed around the mouth defined by the funnel-shaped outer wall defining the upper bin portion, a launder for collecting water discharged from the flow passage defined between the funnel and the funnel-shaped outer wall of the upper bin portion.
8. A de-watering apparatus as claimed in any one of the preceding claims, which includes extraction means for extracting water and granular material from the discharge opening of the lower bin portion.
9. A de-watering apparatus as claimed in claim 1 , substantially as described herein with reference to and as illustrated in the accompanying diagrammatic drawings.
PCT/IB2006/054197 2005-11-10 2006-11-10 A de-watering apparatus WO2007054912A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ZA2005/09095 2005-11-10
ZA200509095 2005-11-10

Publications (1)

Publication Number Publication Date
WO2007054912A1 true WO2007054912A1 (en) 2007-05-18

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PCT/IB2006/054197 WO2007054912A1 (en) 2005-11-10 2006-11-10 A de-watering apparatus

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WO (1) WO2007054912A1 (en)
ZA (1) ZA200706086B (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5186821A (en) * 1991-09-03 1993-02-16 D. Thomas Murphy Wastewater treatment process with cooperating velocity equalization, aeration and decanting means
US5433862A (en) * 1992-08-24 1995-07-18 Technology Finance Corporation (Proprietary) Limited Process for treating a suspension of solid particles in a carrier liquid
DE19501034A1 (en) * 1995-01-16 1996-07-18 Huber Hans Gmbh Maschinen Und Device for separating floating and suspended matter from a liquid
US20020057944A1 (en) * 2000-04-29 2002-05-16 Adams Jeff D. Storm water inlet pollution trap

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5186821A (en) * 1991-09-03 1993-02-16 D. Thomas Murphy Wastewater treatment process with cooperating velocity equalization, aeration and decanting means
US5433862A (en) * 1992-08-24 1995-07-18 Technology Finance Corporation (Proprietary) Limited Process for treating a suspension of solid particles in a carrier liquid
DE19501034A1 (en) * 1995-01-16 1996-07-18 Huber Hans Gmbh Maschinen Und Device for separating floating and suspended matter from a liquid
US20020057944A1 (en) * 2000-04-29 2002-05-16 Adams Jeff D. Storm water inlet pollution trap

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