WO2006045883A1 - Filter assembly for sampling - Google Patents

Filter assembly for sampling Download PDF

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Publication number
WO2006045883A1
WO2006045883A1 PCT/FI2005/000457 FI2005000457W WO2006045883A1 WO 2006045883 A1 WO2006045883 A1 WO 2006045883A1 FI 2005000457 W FI2005000457 W FI 2005000457W WO 2006045883 A1 WO2006045883 A1 WO 2006045883A1
Authority
WO
WIPO (PCT)
Prior art keywords
filtering
housing
solid
filter
cartridge
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.)
Ceased
Application number
PCT/FI2005/000457
Other languages
French (fr)
Inventor
Voitto Saarinen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Outokumpu Oyj
Metso Corp
Original Assignee
Outotec Oyj
Outokumpu Oyj
Outokumpu Technology Oyj
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 Outotec Oyj, Outokumpu Oyj, Outokumpu Technology Oyj filed Critical Outotec Oyj
Priority to AU2005298601A priority Critical patent/AU2005298601B2/en
Priority to CA2583926A priority patent/CA2583926C/en
Priority to US11/577,482 priority patent/US7820046B2/en
Priority to EA200700749A priority patent/EA009831B1/en
Priority to CN2005800373326A priority patent/CN101060901B/en
Publication of WO2006045883A1 publication Critical patent/WO2006045883A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
    • B01D35/22—Directing the mixture to be filtered on to the filters in a manner to clean the filters
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N1/00—Sampling; Preparing specimens for investigation
    • G01N1/02—Devices for withdrawing samples
    • G01N1/10—Devices for withdrawing samples in the liquid or fluent state
    • G01N1/20—Devices for withdrawing samples in the liquid or fluent state for flowing or falling materials
    • G01N1/2035—Devices for withdrawing samples in the liquid or fluent state for flowing or falling materials by deviating part of a fluid stream, e.g. by drawing-off or tapping
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/11—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements
    • B01D29/13—Supported filter elements
    • B01D29/15—Supported filter elements arranged for inward flow filtration
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/88—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor having feed or discharge devices
    • B01D29/90—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor having feed or discharge devices for feeding
    • B01D29/902—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor having feed or discharge devices for feeding containing fixed liquid displacement elements or cores
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/88—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor having feed or discharge devices
    • B01D29/90—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor having feed or discharge devices for feeding
    • B01D29/908—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor having feed or discharge devices for feeding provoking a tangential stream
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N1/00—Sampling; Preparing specimens for investigation
    • G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
    • G01N1/34—Purifying; Cleaning
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N1/00—Sampling; Preparing specimens for investigation
    • G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
    • G01N1/40—Concentrating samples
    • G01N1/4077—Concentrating samples by other techniques involving separation of suspended solids
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

Definitions

  • the present invention is directed to the filed of solid-liquid separation by means of filtration. More specifically, the present invention concerns a method and apparatus for obtaining a filtered sample from a process stream that comprises liquid, dissolved matter and solids.
  • the object of the present invention is to overcome the problems related to prior art and provide a novel apparatus for continuous sampling of an industrial process stream, such as liquid flow of a hydrometallurgical process.
  • the filtering apparatus of the present invention continuously provides analyzer equipment with a solid-free sample of the process flow.
  • the filtering apparatus produces a sample flow that represents real-time conditions of the process.
  • the sample flow is formed when a liquid flow of an industrial process is fed into the inlet of an filtering apparatus and flows cross a filtering medium where part of the liquid passes through the filtering medium and enters the outlet of the filtering apparatus.
  • Another object of the invention is to provide a filtering apparatus with relatively long maintenance interval and with easy replacement of the filtering cartridge.
  • the filtering apparatus of the present invention has excellent washing action property that prevents cake deposition on the filter surface. Most of the feed into the filtering unit passes over the filter surface and exits the unit via an outlet port for the solid-containing flow. Only a minor part of the liquid in the feed passes through the filtering media. The liquid flow is fed into the fluid passageway of the filtering apparatus at a velocity sufficient to induce shear- cleansing current across the filter surface.
  • the filter cartridge contains filtering media that is flexible cloth that comprises textile or web, such as web comprising polypropylene or polyamide.
  • the filtering media is chosen according to the type of the process slurry.
  • the filter cartridge is arranged to the filter housing in a manner that provides easy maintenance of the filter, i.e. the filter cartridge is easy to remove and reinstall.
  • the filtering apparatus of the present invention provides reliable and continuous on-line sample delivery for an analyzer.
  • the filtering apparatus may function continuously for several weeks.
  • the filtered sample created with the filtering apparatus of the present invention represents exactly the real-time composition of the process flow, since accumulation of the sample in the filtering apparatus is minimized with eliminating dead volume inside the filter cavity. This is accomplished by applying a filler rod inside the filter cavity and the filtering cartridge.
  • the present invention provides a filter assembly for obtaining a filtered liquid sample from slurry, such as liquid process stream that contains liquid, dissolved matter and solids.
  • slurry such as liquid process stream that contains liquid, dissolved matter and solids.
  • the process flow having kinetic energy is fed into a filter chamber so as to provide a helicoidal flow pattern of the slurry on a surface of a filter media.
  • the slurry has velocity that generates scouring and cleaning action on the filter media thus preventing cake formation on the filter.
  • the filter assembly comprises an elongated cylindrical cartridge housing defining a filter cavity, a slurry feed port, a slurry outlet port and a filtrate outlet port, a solid filler rod that is arranged to eliminate dead volume of the filter cavity and to support flexible filtering media, a cylindrical filter cartridge comprising said flexible filtering media arranged between the inner surface of the housing and the solid filler rod, and a helicoidal passage way for the slurry defined by the inner surface of the housing and outer surface of the filter cartridge.
  • the slurry feed port and the slurry outlet port are both in fluid communication with the helicoidal passage way, and the filtrate outlet port is in fluid communication with an annular cavity defined by the solid filler rod and inner surface of the cylindrical filter cartridge.
  • the filtering media needs to be cleaned by backflushing action.
  • the flexible filtering media promotes the cleaning action, since it bulges outwards form the surface of the filler rod, whereas during normal operation, the filtering media is pressed against the filler rod.
  • Fig. 1 shows a simplified flow chart of the filter assembly according to the present invention
  • Fig. 2 shows a cross-section view of one preferred embodiment of the filter assembly according to the present invention
  • Fig. 3 is detailed cross-section view of the embodiment shown in Fig. 2, and
  • Fig. 4a and Fig. 4b show details A and B respectively of the cross-section view of Fig. 2.
  • Fig. 1 shows a simplified chart of one possible coupling of the filtering assembly of the present invention between process flow and analyzer equipment.
  • the filtering apparatus 10 is preferably operated in vertical position.
  • Flow 12 is withdrawn from main process stream 11 and led to an inlet port arranged in the upper end of the filtering apparatus 10.
  • Flow 13 passed through the spiral passageway of the filtering apparatus 10 and exited the slurry outlet port is returned to main process stream 11.
  • Filtered sample flow 14 is forwarded to an analyzer apparatus 15.
  • the filtering assembly provides the analyzer with a small quantity of filtered sample returning the bulk of the sample intake to the process.
  • the analyzer equipment may comprise a pneumatic sample dispatch station for transporting the filtered sample to the analysis chamber of the analyzer.
  • the apparatus comprises an elongated cylindrical cartridge housing 21 , a cylindrical filter cartridge 27, and a solid filler rod 28.
  • the filter cartridge 27 covers the solid filler rod 28 and forms a cavity between its inner surface and the surface of the solid rod 28.
  • the cartridge housing 21 further comprises a cap flange that closes the upper end of the cylindrical housing and a bottom flange that closes the lower end of the housing.
  • the housing determines a slurry input opening 22, a slurry output opening 23, and a filtrate sample out put opening 24.
  • a spiral passageway for the slurry spans between the inner surface of the cartridge housing 21 and the outer surface of the filter cartridge 27.
  • a pressure gauge 25 is arranged to the cartridge housing.
  • a helicoidal groove 26 is worked on the inner surface of the cartridge housing 21.
  • the pitch of the groove is between 8 and 20 mm, preferably it is between 10 and 15 mm.
  • the groove shown in Fig. 2 has a right- hand twist.
  • the downright profile of the groove may have a form of triangle, rectangular or it may be rounded.
  • the profile of the groove shown in Fig. 2 is rounded with a radius of 5 mm.
  • the depth of the groove is adjusted according to the process slurry.
  • the ratio of the inner diameter of the housing to the length of the housing is between 5:100 to 30:100, preferably between 8:100 to 12:100.
  • Fig. 3 shows a cut-away view of parts of the filter apparatus according to a preferred embodiment of the present invention.
  • the helicoidal groove 36 is formed on the inside wall of the cartridge housing 31.
  • the surface of the solid filler rod 38 is textured having rifled and grooved surface.
  • the grooves may be longitudinal or radial or both.
  • the rifles may span from the top to the lower end of the rod forming a spiral passageway for the filtrate.
  • the texture of the solid filler rod comprises both rifles and grooves.
  • the depth of the texture is essentially smaller than the depth of the helicoidal groove forming the passageway for the slurry.
  • the depth of the grooves or rifles is preferably 0.2 - 5 mm, most preferably 0.5 -2 mm.
  • the textured surface expands the cavity formed between the filter cartridge 39 and the solid filler rod 38 so as to facilitate the flow of the filtrate towards the output port of the filtrate.
  • Fig. 4a and Fig. 4b show details A and B of Fig. 2.
  • Filtering-clothe 49 is waterproof arranged to a connection ring 50 and a cap 51.
  • the filtering cloth 49 and the connection ring 50 and the cap 51 comprise preferably same kind of polymer.
  • the filtering cloth 49 and the ring 50 and the cap 51 preferably comprise polyamide or polypropylene.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Sampling And Sample Adjustment (AREA)
  • Filtration Of Liquid (AREA)

Abstract

A filter assembly is provided for obtaining a filtered liquid sample from slurry, such as a liquid process stream that contains liquid, dissolved matter and solids. A housing (21) defines a cavity. A rod (28) is arranged in the cavity and supports a filter (49) . A cartridge (27) comprises the filter (49) , and is arranged between the housing (21) and the rod (28) . Furthermore, there is a helicoidal passage for a slurry defined by the housing and the cartridge. There is also a cavity defined by the rod and the cartridge. The slurry has velocity that generates scouring and cleaning action on the filter media thus preventing cake formation on the filter. The filtering apparatus of the present invention provides reliable and continuous on-line sample delivery for an analyzer.

Description

FILTER ASSEMBLY FOR SAMPLING
The present invention is directed to the filed of solid-liquid separation by means of filtration. More specifically, the present invention concerns a method and apparatus for obtaining a filtered sample from a process stream that comprises liquid, dissolved matter and solids.
In industrial processes involving handling and processing of solids containing liquids, it is often necessary to control the process regularly and continuously. Several analyzing methods used to today can be performed only with liquids free of solids. Such methods are for example optical analyzing methods, conductivity measurements, pH measuring and methods utilizing x-rays such as x-ray fluorescence analysis. In order to monitor rapidly evolving industrial processes and control them optimally on the basis of the results of such measurements, it is necessary to take samples from a process stream continuously and analyze them instantaneously and without delay. Examples of industrial processes requiring real-time on-stream analyzing of liquids are processes in the field of hydrometallurgy. Leaching metals, liquid purification and electrolytic refining and recovering processes represents such hydrometallurgical processes where on-stream analyzers are used.
For the purpose of providing an on-line analyzer with a filtered flow of process liquor, several filtering apparatus have been developed. According to a known approach of removing solids from a liquid the principles of cross-flow filtration are utilized. The publication of a US patent 3 674 153 discloses a cross-flow type filter, i.e. a bypass filter assembly for obtaining a filtered sample from a process stream. The filter assembly comprises a filter medium and a filter chamber involving a washing action property wherein the fluid passes the filter medium in a relatively high velocity and thus prevents cake deposition on the filter surface. However, in the filter assembly of US 3 674 153, fast cake deposition still takes place and a need for frequently replacing the filter media with a fresh one exists. SUMMARY OF THE INVENTION
The object of the present invention is to overcome the problems related to prior art and provide a novel apparatus for continuous sampling of an industrial process stream, such as liquid flow of a hydrometallurgical process. The filtering apparatus of the present invention continuously provides analyzer equipment with a solid-free sample of the process flow. The filtering apparatus produces a sample flow that represents real-time conditions of the process. The sample flow is formed when a liquid flow of an industrial process is fed into the inlet of an filtering apparatus and flows cross a filtering medium where part of the liquid passes through the filtering medium and enters the outlet of the filtering apparatus.
Another object of the invention is to provide a filtering apparatus with relatively long maintenance interval and with easy replacement of the filtering cartridge.
The filtering apparatus of the present invention has excellent washing action property that prevents cake deposition on the filter surface. Most of the feed into the filtering unit passes over the filter surface and exits the unit via an outlet port for the solid-containing flow. Only a minor part of the liquid in the feed passes through the filtering media. The liquid flow is fed into the fluid passageway of the filtering apparatus at a velocity sufficient to induce shear- cleansing current across the filter surface.
The filter cartridge contains filtering media that is flexible cloth that comprises textile or web, such as web comprising polypropylene or polyamide. The filtering media is chosen according to the type of the process slurry. The filter cartridge is arranged to the filter housing in a manner that provides easy maintenance of the filter, i.e. the filter cartridge is easy to remove and reinstall. The filtering apparatus of the present invention provides reliable and continuous on-line sample delivery for an analyzer. The filtering apparatus may function continuously for several weeks.
The filtered sample created with the filtering apparatus of the present invention represents exactly the real-time composition of the process flow, since accumulation of the sample in the filtering apparatus is minimized with eliminating dead volume inside the filter cavity. This is accomplished by applying a filler rod inside the filter cavity and the filtering cartridge.
The present invention provides a filter assembly for obtaining a filtered liquid sample from slurry, such as liquid process stream that contains liquid, dissolved matter and solids. The process flow having kinetic energy is fed into a filter chamber so as to provide a helicoidal flow pattern of the slurry on a surface of a filter media. The slurry has velocity that generates scouring and cleaning action on the filter media thus preventing cake formation on the filter.
The filter assembly comprises an elongated cylindrical cartridge housing defining a filter cavity, a slurry feed port, a slurry outlet port and a filtrate outlet port, a solid filler rod that is arranged to eliminate dead volume of the filter cavity and to support flexible filtering media, a cylindrical filter cartridge comprising said flexible filtering media arranged between the inner surface of the housing and the solid filler rod, and a helicoidal passage way for the slurry defined by the inner surface of the housing and outer surface of the filter cartridge. The slurry feed port and the slurry outlet port are both in fluid communication with the helicoidal passage way, and the filtrate outlet port is in fluid communication with an annular cavity defined by the solid filler rod and inner surface of the cylindrical filter cartridge.
Time to time, the filtering media needs to be cleaned by backflushing action. The flexible filtering media promotes the cleaning action, since it bulges outwards form the surface of the filler rod, whereas during normal operation, the filtering media is pressed against the filler rod.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention is described in more detail referring to following drawings, where
Fig. 1 shows a simplified flow chart of the filter assembly according to the present invention,
Fig. 2 shows a cross-section view of one preferred embodiment of the filter assembly according to the present invention,
Fig. 3 is detailed cross-section view of the embodiment shown in Fig. 2, and
Fig. 4a and Fig. 4b show details A and B respectively of the cross-section view of Fig. 2.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
Fig. 1 shows a simplified chart of one possible coupling of the filtering assembly of the present invention between process flow and analyzer equipment. The filtering apparatus 10 is preferably operated in vertical position. Flow 12 is withdrawn from main process stream 11 and led to an inlet port arranged in the upper end of the filtering apparatus 10. Flow 13 passed through the spiral passageway of the filtering apparatus 10 and exited the slurry outlet port is returned to main process stream 11. Filtered sample flow 14 is forwarded to an analyzer apparatus 15. The filtering assembly provides the analyzer with a small quantity of filtered sample returning the bulk of the sample intake to the process. The analyzer equipment may comprise a pneumatic sample dispatch station for transporting the filtered sample to the analysis chamber of the analyzer. Fig. 2 is a cross sectional view of one embodiment of the filtering apparatus according to the present invention. The apparatus comprises an elongated cylindrical cartridge housing 21 , a cylindrical filter cartridge 27, and a solid filler rod 28. The filter cartridge 27 covers the solid filler rod 28 and forms a cavity between its inner surface and the surface of the solid rod 28. The cartridge housing 21 further comprises a cap flange that closes the upper end of the cylindrical housing and a bottom flange that closes the lower end of the housing. The housing determines a slurry input opening 22, a slurry output opening 23, and a filtrate sample out put opening 24. A spiral passageway for the slurry spans between the inner surface of the cartridge housing 21 and the outer surface of the filter cartridge 27. A pressure gauge 25 is arranged to the cartridge housing. A helicoidal groove 26 is worked on the inner surface of the cartridge housing 21. The pitch of the groove is between 8 and 20 mm, preferably it is between 10 and 15 mm. The groove shown in Fig. 2 has a right- hand twist. The downright profile of the groove may have a form of triangle, rectangular or it may be rounded. The profile of the groove shown in Fig. 2 is rounded with a radius of 5 mm. The depth of the groove is adjusted according to the process slurry. The ratio of the inner diameter of the housing to the length of the housing is between 5:100 to 30:100, preferably between 8:100 to 12:100.
Fig. 3 shows a cut-away view of parts of the filter apparatus according to a preferred embodiment of the present invention. The helicoidal groove 36 is formed on the inside wall of the cartridge housing 31. The surface of the solid filler rod 38 is textured having rifled and grooved surface. The grooves may be longitudinal or radial or both. The rifles may span from the top to the lower end of the rod forming a spiral passageway for the filtrate. Preferably the texture of the solid filler rod comprises both rifles and grooves. The depth of the texture is essentially smaller than the depth of the helicoidal groove forming the passageway for the slurry. The depth of the grooves or rifles is preferably 0.2 - 5 mm, most preferably 0.5 -2 mm. The textured surface expands the cavity formed between the filter cartridge 39 and the solid filler rod 38 so as to facilitate the flow of the filtrate towards the output port of the filtrate.
Fig. 4a and Fig. 4b show details A and B of Fig. 2. Filtering-clothe 49 is waterproof arranged to a connection ring 50 and a cap 51. The filtering cloth 49 and the connection ring 50 and the cap 51 comprise preferably same kind of polymer. The filtering cloth 49 and the ring 50 and the cap 51 preferably comprise polyamide or polypropylene.
While the invention has been described with reference to its preferred embodiments, it is to be understood that modifications and variations will occur to those skilled in the art. Such modifications and variations are intended to fall within the scope of the appended claims.

Claims

CLAIMS:
1. An apparatus for forming a solid-free liquid flow from a solid-containing liquid flow, comprising a cartridge housing defining a filtering cavity and inlet and outlet ports for said solid-containing liquid, and a filtering cartridge containing filtering media, and a filtrate output port, characterized in that an elongated cylindrical cartridge housing (21 , 31) defines a filter cavity, a slurry feed port (22), a slurry outlet port (23) and a filtrate outlet port (24), a solid filler rod (28, 38) is arranged to eliminate dead volume of the filter cavity and to support flexible filtering media (49), a cylindrical filter cartridge (27, 39) comprises said flexible filtering media (49) arranged between the inner surface of the housing (21 , 31) and the solid filler rod (28, 38), a helicoidal passage way (26, 36) for the slurry is defined by the inner surface of the housing (21 , 31) and outer surface of the filter cartridge (27, 39) the slurry feed port (22) and the slurry outlet port (23) are both in fluid communication with the helicoidal passage way, and the filtrate outlet port (23) is in fluid communication with an annular cavity defined by the solid filler rod (28, 38) and inner surface of the cylindrical filter cartridge (27, 39).
2. The apparatus according to claim 1 , characterized in that the helicoidal passageway (26, 36) is determined by the outer surface of the filter cartridge (27, 39) and a worked helicoidal groove on the inner surface of the cartridge housing (21 , 31).
3. The apparatus according to claim 2, characterized in that the downright profile of the helicoidal groove (26, 36) has a form of triangle, rectangular or it is rounded.
4. The apparatus according to claim 2, characterized in that the helicoidal groove (26, 36) has a pitch between 8 and 20 mm, preferably between 10 and 15 mm.
5. The apparatus according to claim 1 , characterized in that the ratio of the inner diameter of the housing (21 , 31) to the length of the housing is between 5:100 to 30:100, preferably between 8:100 to 12:100.
6. The apparatus according to claim 1 , characterized in that the surface of the solid filler rod (28, 38) is textured to facilitate the flow of the filtrate towards the output port of the filtrate.
7. The apparatus according to claim 6, characterized in that the surface of the solid filler rod (28, 38) is rifled or grooved or both.
8. The apparatus according to claim 1 , characterized in that the filter cartridge (27, 39) comprises filtering cloth (49)
9. The apparatus according to claim 8, characterized in that the filtering cloth (49) comprises polyamide or polypropylene.
10. The apparatus according to claim 1 , characterized in that the filter cartridge (27, 39) comprises filtering cloth (49) that is waterproof arranged to a connection ring (50) and a cap (51).
11. The apparatus according to claim 10, characterized in that the filtering cloth (49), the connection ring (50) and the cap (51) comprise same kind of polymer, such as polyamide or polypropylene.
12. An installation for separating a solid-free liquid flow from a solid-containing process stream comprising means for withdrawing a side stream from the process stream and means for conducting said side stream to a filtering apparatus of claim 1 for separating a solid-free flow from the side stream.
PCT/FI2005/000457 2004-10-29 2005-10-26 Filter assembly for sampling Ceased WO2006045883A1 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
AU2005298601A AU2005298601B2 (en) 2004-10-29 2005-10-26 Filter assembly for sampling
CA2583926A CA2583926C (en) 2004-10-29 2005-10-26 Filter assembly for sampling
US11/577,482 US7820046B2 (en) 2004-10-29 2005-10-26 Filter assembly for sampling
EA200700749A EA009831B1 (en) 2004-10-29 2005-10-26 Filter assembly for sampling
CN2005800373326A CN101060901B (en) 2004-10-29 2005-10-26 Sampling Filter Assembly

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI20041399A FI123096B (en) 2004-10-29 2004-10-29 Filter arrangement for sampling
FI20041399 2004-10-29

Publications (1)

Publication Number Publication Date
WO2006045883A1 true WO2006045883A1 (en) 2006-05-04

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI2005/000457 Ceased WO2006045883A1 (en) 2004-10-29 2005-10-26 Filter assembly for sampling

Country Status (8)

Country Link
US (1) US7820046B2 (en)
CN (1) CN101060901B (en)
AU (1) AU2005298601B2 (en)
CA (1) CA2583926C (en)
EA (1) EA009831B1 (en)
FI (1) FI123096B (en)
WO (1) WO2006045883A1 (en)
ZA (1) ZA200704331B (en)

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CN111964943A (en) * 2020-07-21 2020-11-20 苏州市美益添生物科技有限公司 A food sampling equipment for taking seed fruit to detect

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ZA200704331B (en) 2009-09-30
US7820046B2 (en) 2010-10-26
AU2005298601A1 (en) 2006-05-04
CA2583926A1 (en) 2006-05-04
CN101060901B (en) 2010-05-12
CN101060901A (en) 2007-10-24
US20080035549A1 (en) 2008-02-14
FI123096B (en) 2012-11-15
EA200700749A1 (en) 2007-10-26
CA2583926C (en) 2013-05-28
EA009831B1 (en) 2008-04-28
FI20041399A0 (en) 2004-10-29
FI20041399L (en) 2006-04-30

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