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WO2017005970A1 - Élément de filtre à indicateur de rupture conducteur - Google Patents

Élément de filtre à indicateur de rupture conducteur Download PDF

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Publication number
WO2017005970A1
WO2017005970A1 PCT/FI2016/050478 FI2016050478W WO2017005970A1 WO 2017005970 A1 WO2017005970 A1 WO 2017005970A1 FI 2016050478 W FI2016050478 W FI 2016050478W WO 2017005970 A1 WO2017005970 A1 WO 2017005970A1
Authority
WO
WIPO (PCT)
Prior art keywords
filter
filter element
element according
elastic layer
outer edge
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/FI2016/050478
Other languages
English (en)
Inventor
Kari VÄNTTINEN
Mika ILLI
Rolf Hindström
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.)
Outotec Finland Oy
Original Assignee
Outotec Finland Oy
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 Finland Oy filed Critical Outotec Finland Oy
Priority to BR212018000147U priority Critical patent/BR212018000147Y8/pt
Priority to CN201690000984.6U priority patent/CN208161158U/zh
Priority to FI20180107A priority patent/FI20180107A1/en
Publication of WO2017005970A1 publication Critical patent/WO2017005970A1/fr
Anticipated expiration legal-status Critical
Priority to ZA2018/00261A priority patent/ZA201800261B/en
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
    • B01D35/14—Safety devices specially adapted for filtration; Devices for indicating clogging
    • B01D35/143—Filter condition indicators
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D33/00—Filters with filtering elements which move during the filtering operation
    • B01D33/15—Filters with filtering elements which move during the filtering operation with rotary plane filtering surfaces
    • B01D33/21—Filters with filtering elements which move during the filtering operation with rotary plane filtering surfaces with hollow filtering discs transversely mounted on a hollow rotary shaft
    • B01D33/23—Construction of discs or component sectors thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D33/00—Filters with filtering elements which move during the filtering operation
    • B01D33/15—Filters with filtering elements which move during the filtering operation with rotary plane filtering surfaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D33/00—Filters with filtering elements which move during the filtering operation
    • B01D33/15—Filters with filtering elements which move during the filtering operation with rotary plane filtering surfaces
    • B01D33/21—Filters with filtering elements which move during the filtering operation with rotary plane filtering surfaces with hollow filtering discs transversely mounted on a hollow rotary shaft
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D33/00—Filters with filtering elements which move during the filtering operation
    • B01D33/44—Regenerating the filter material in the filter
    • 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
    • B01D35/14—Safety devices specially adapted for filtration; Devices for indicating clogging
    • B01D35/143—Filter condition indicators
    • B01D35/1435—Filter condition indicators with alarm means
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
    • G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
    • G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
    • G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
    • G06K19/0723—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips the record carrier comprising an arrangement for non-contact communication, e.g. wireless communication circuits on transponder cards, non-contact smart cards or RFIDs

Definitions

  • the invention relates to a filter element of a disc filter apparatus, the filter element comprising filter members on both sides of the element, the filter member comprising a microporous permeable membrane layer, the filter member formed to cause a capillary phenomenon in a filtering process, the filter element having outer edge surface comprising said microporous material, and a porous substrate arranged between the filter members.
  • the invention further relates to a disc filter apparatus comprising one or more consecutive co-axial filter disc(s) with sectors formed by a plurality of the filter elements.
  • the invention still further relates to a method for regeneration of a disc filter apparatus.
  • Filtration is a widely used process whereby a slurry or solid liquid mixture is forced through a filter member, with the solids retained on the filter member, as a cake, and the liquid phase passing through. This process is generally well understood in the industry. Examples of filtration types include depth filtration, pressure and vacuum filtration, and gravity and centrifugal filtration.
  • the cake formation in vacuum filtration is based on generating suction within the filtrate channels.
  • the most commonly used filter members for vacuum filters are filter cloths and coated media, e.g. the ceramic filter members. These filter members are commonly used in filter apparatuses having filter comprising multiple filter elements, e.g. in rotary vacuum disc filter appa- ratuses.
  • Rotary vacuum disc filters are used for the filtration of relatively free filtering suspensions on a large scale, such as the dewatering of mineral concentrates.
  • the dewatering of mineral concentrates requires large capacity in addition to producing a cake with low moisture content.
  • Such large processes are commonly energy intensive and means to lower the specific energy consumption are needed.
  • the vacuum disc filter may comprise a plurality of filter discs arranged in line co-axially and around a central pipe or shaft.
  • Each filter disc may be formed of a number of individual filter elements or sectors, called filter plates, that are mounted circumferentially in a radial plane around the central pipe or shaft to form the filter disc, and as the shaft is fitted so as to revolve, each filter plate or sector is, in its turn, displaced into a slurry basin and further, as the shaft of rotation revolves, rises out of the basin.
  • filter plates that are mounted circumferentially in a radial plane around the central pipe or shaft to form the filter disc, and as the shaft is fitted so as to revolve, each filter plate or sector is, in its turn, displaced into a slurry basin and further, as the shaft of rotation revolves, rises out of the basin.
  • the filter member is submerged in the slurry basin where, under the influence of the vacuum, the cake forms onto the medium.
  • the pores are emptied as the cake is deliquored for a predetermined time which is essentially limited by the rotation speed of the disc.
  • the cake can be discharged by a back-pulse of air or by scraping, after which the cycle begins again.
  • the ceramic filter member when wetted, does not allow air to pass through, which further decreases the necessary vacuum level, enables the use of smaller vacuum pumps and, consequently, yields significant energy savings.
  • the filter element is affected by slurry particles and extraneous compounds, especially in the field of dewatering of mineral concentrates. Therefore, the filter elements have to be regenerated.
  • the filter element is periodically regenerated with the use of one or more of three different methods, for example: (1 ) backwashing, (2) ultrasonic cleaning, and (3) acid washing. Whereas the regenerative effect of backwashing and ultrasound are more or less mechanical, regeneration with acids is based on chemistry.
  • the regeneration with acids is performed by applying acid, i.e. typically acid-water -compound, by elevated pressure or positive pressure created in a backwashing equipment inside the filter element.
  • acid i.e. typically acid-water -compound
  • the pressure used in the regeneration may create cracks or crazes or expand already exist- ing cracks or crazes in the microporous material.
  • the acid may spurt or spray through the cracks out from the filter element and, in some circumstances, may create a risk for operators of the apparatus to be exposed to the acid.
  • a filter element of a disc filter apparatus comprising filter members on both sides of the element, the filter member comprising a microporous permeable membrane layer, the filter member formed to cause a capillary phenomenon in a filtering process, the filter element having outer edge surface comprising said microporous material, and a porous substrate arranged between the filter members, the filter element further comprising an elastic layer arranged on a peripheral outer edge surface of the filter element and covering the mi- croporous material on said peripheral outer edge surface.
  • a filter element comprising one or more consecutive co-axial filter disc(s) with sectors formed by a plurality of filter elements, the filter arranged around a central shaft and being rotatable around longitudinal axis of the central shaft, the filter apparatus, the disc filter apparatus further comprising a filter element of a disc filter apparatus, the filter element comprising filter members on both sides of the element, the filter member comprising a microporous permeable membrane layer, the filter member formed to cause a capillary phenomenon in a filtering process, the filter element having outer edge surface comprising said microporous material, and a porous substrate arranged between the filter members, the filter element further comprising an elastic layer arranged on a peripheral outer edge surface of the filter element and covering the microporous material on said peripheral outer edge surface.
  • a method for regeneration of a disc filter apparatus comprising the filter element according to any one of claims 1 - 13, the method comprising creating an elevated pressure in the interior space of the filter element by feeding a washing agent into said interior space with a backwashing equipment.
  • inventive embodiments are characterised by what is stated in the claims. Inventive embodiments are also disclosed in the specification and drawings of this patent application.
  • inventive content of the patent applica- tion may also be defined in other ways than defined in the following claims.
  • the inventive content may also be formed of several separate inventions, especially if the invention is examined in the light of expressed or implicit sub- tasks or in view of obtained benefits or benefit groups. Some of the definitions contained in the following claims may then be unnecessary in view of the separate inventive ideas.
  • Features of the different embodiments of the invention may, within the scope of the basic inventive idea, be applied to other embodiments.
  • Figure 1 is a perspective top view of an exemplary disc filter apparatus
  • Figure 2 illustrates an embodiment of a disc filter element
  • Figure 3 is another view of the filter element shown in Figure 2.
  • a material to be filtered is referred to as a slurry, but embodiments are not intended to be restricted to this type of fluid material.
  • the slurry may have high solids concentration, e.g. base metal concentrates, iron ore, chromite, ferrochrome, copper, gold, cobalt, nickel, zinc, lead and pyrite.
  • Figure 1 is a perspective top view of an exemplary disc filter apparatus 1 .
  • the actual filter 2 comprises at least one filter disc 3, each of which comprises number of sector-shaped filter elements 4 that are mounted circumferentially in a radial planar plane around the central axis of the disc filter apparatus 1 .
  • the number of the filter elements 3 included in a filter disc may be 12 or 15, for example.
  • the number of the filter discs 3 may range from 2 to 20, for example.
  • the diameter of each disc 3 may be ranging from 1 .5 m to 4 m, for example.
  • Examples of commercially available disc filters include Ceramec CC filters, models CC-6, CC-15, CC-30, CC-45, CC-60, CC-96 and CC-144 manufactured by Outotec Inc.
  • each filter element 4 is, in its turn, dis- placed into a slurry basin and further, as the rotation continues, rises out of the basin.
  • Figure 2 is a perspective exploited view of an exemplary disc filter element
  • Figure 3 is a view of the filter element shown in Figure 2 assembled.
  • the filter element 4 comprises filter members 1 1 on both sides of the element 4.
  • the filter member 1 1 comprises a microporous permeable membrane layer 7 which is formed to cause a capillary phenomenon in the filtering process.
  • the microporous material has susceptibility to brittle fracture.
  • the filter element 4 is a truncated-sector-shaped filter element 4. Thus it is suitable for use in common disc filter apparatuses.
  • the filter element 4 has an outer edge surface 12 that circulates around the element 4.
  • This outer edge surface 12 also comprises the microporous material.
  • the part of the outer edge surface 12 lying in the wider end of the truncated-sector-shaped filter element 4 is the peripheral outer edge surface 9 of the filter element 4.
  • the filter element 4 further comprises an elastic layer 13 arranged on the peripheral outer edge surface 9.
  • the elastic layer 13 may be attached to the peripheral outer edge surface 9 by e.g. gluing, vulcanizing, welding etc.
  • the elastic layer 13 covers at least part of the microporous material on said peripheral outer edge surface 9.
  • the elastic layer has a solid structure, i.e. there are no holes extending through the elastic layer 13.
  • the elastic layer 13 may comprise thermoplastic material.
  • thermoplastic materials are usually easy to convert into shape of product, i.e. the manufacturing process of the elastic layer 13 is easy.
  • the elastic layer 13 may comprise thermo- set material.
  • thermoset materials have usually good chemical and mechanical properties.
  • the elastic layer 13 is made of rubber. An advantage is that rubber has good elastic properties.
  • the elastic layer 13 may be an independent and stand-alone layer or element, or alternatively, it may be combined with another layer or element that may have a non-elastic nature. Furthermore, the elastic layer 13 may comprise one or multiple layers of elastic material(s).
  • the length of the elastic layer 13 is 90 % - 100 % of the length of the peripheral outer edge surface 9.
  • the elastic layer 13 being less than 100 % of said dimension may be arranged symmetrically or asymmetrically with respect to the width of the peripheral outer edge surface 9.
  • the width of the elastic layer 13 is 90 % - 100 % of the width of the peripheral outer edge surface.
  • the elastic layer 13 being less than 100 % of said dimension may be arranged symmetrically or asymmetrically with respect to the width of the peripheral outer edge surface 9.
  • An advantage is that the protection against leakages through cracks in peripheral outer edge surface 9 is good enough when 90 % of the length or the width is covered, and very good when 100 % of the peripheral outer edge surface 9 is covered. Thus the user safety may be increased.
  • the thickness of the elastic layer 13 is 2 mm - 9 mm, preferably 3 mm - 5 mm.
  • the elastic layer of this thickness may assure that at least typical jet/flush of washing agent does not penetrate through elastic layer 13.
  • the filter element 4 comprises an indicator 5 arranged to generate a break indication upon breakage of the filter element 4. At least a portion of the indicator 5 may be arranged on the microporous material on the peripheral outer edge surface 9 and under the elastic layer 13. Other portions, if any, of the indicator 5 may extend along the filter element 4 to form a continuous circuit and arranged to break upon breakage of the filter element 4.
  • the indicator 5 may increase user safety by creating the break indication, such as visual and/or audible alarm, in case the filter element 4 is breaking or crazing. This way operators of the apparatus are able to be vigilant and avoid thus potential safety risks caused e.g. by spurting or spraying acid. In other words, the user safety is assured two ways: firstly by the elastic layer 13 that increases the passive safety of the filter process, and secondly by actively functioning indicator 5 that gives the alarm.
  • the control system of the filter apparatus is arranged to stop automatically the filter apparatus.
  • the indicator 5 comprises an electrically conductive layer, e.g. a printed electric wire, a casted electric wire, a microstrip line, separate electric wire, a metal tape or a painted electric circuit, for example.
  • an electrically conductive layer e.g. a printed electric wire, a casted electric wire, a microstrip line, separate electric wire, a metal tape or a painted electric circuit, for example.
  • the indicator 5 may be attached to the microporous material by a brittle adhesive.
  • the interior space provides a flow canal or canals where a negative pressure is maintained, i.e. a pressure difference is maintained over the filter members 1 1 , during the filtration process. Under the influence of the negative pressure, the cake forms onto the filter members 1 1 .
  • washing agent e.g. acid or acid-water composition
  • backwashing equipment 15 comprising e.g. necessary pumps, washing agent containers, and feeding channels.
  • regeneration means of the filter apparatus 1 In this stage there are used regeneration means of the filter apparatus 1 .
  • the objective of the acid washing is to remove impurities etc. attached to the filter members 1 1 and micropores therein back and out from the filter members.
  • the backwashing pressure creates an elevated or positive pressure in the interior space.
  • the positive pressure may create such cracks and crazes in the brittle microporous material that the acid leaks out form the filter element 4.
  • Especially problematic, or even dangerous, to users of the filter apparatus are spray- or spurt-like leaks in the peripheral outer edge surface 9.
  • the elastic layer 13 arranged on the peripheral outer edge surface 9 prevents or at least restrains these leaks so that the safety of the personnel can be improved.
  • the filter element comprises an RFID tag 14 that includes the identification data of the filter element 4.
  • the RFID tag 14 can be arranged under the elastic layer 13, thus the RFID tag is protected against mechanical wear and chemical stresses.
  • the peripheral outer edge surface 9 is usually an advantageous place for the RFID tag because it can be read there easily by RFID reader arranged in a frame of the filter apparatus.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Filtering Materials (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)

Abstract

L'invention concerne un élément de filtre d'un appareil à filtre à disques, un appareil à filtre à disques, ainsi qu'un procédé. L'élément de filtre comprend des éléments de filtre sur les deux côtés de l'élément, et l'élément de filtre comprend une couche de membrane perméable microporeuse. L'élément de filtre est formé de manière à provoquer un phénomène de capillarité dans un procédé de filtration. L'élément de filtre a une surface de bord extérieur comprenant ledit matériau microporeux, et un substrat poreux disposé entre les éléments de filtre. L'élément de filtre comprend en outre une couche élastique disposée sur une surface de bord extérieur périphérique de l'élément de filtre et recouvrant le matériau microporeux sur ladite surface de bord extérieur périphérique.
PCT/FI2016/050478 2015-07-03 2016-06-29 Élément de filtre à indicateur de rupture conducteur Ceased WO2017005970A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
BR212018000147U BR212018000147Y8 (pt) 2015-07-03 2016-06-29 Elemento de filtro
CN201690000984.6U CN208161158U (zh) 2015-07-03 2016-06-29 过滤器元件
FI20180107A FI20180107A1 (en) 2015-07-03 2016-06-29 Filter element, disc filter apparatus and method
ZA2018/00261A ZA201800261B (en) 2015-07-03 2018-01-15 Filter element with conductive breaking indicator

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI20155528A FI20155528A (fi) 2015-07-03 2015-07-03 Suodatinelementti, kiekkosuodatinlaite ja menetelmä
FI20155528 2015-07-03

Publications (1)

Publication Number Publication Date
WO2017005970A1 true WO2017005970A1 (fr) 2017-01-12

Family

ID=56369001

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI2016/050478 Ceased WO2017005970A1 (fr) 2015-07-03 2016-06-29 Élément de filtre à indicateur de rupture conducteur

Country Status (6)

Country Link
CN (1) CN208161158U (fr)
BR (1) BR212018000147Y8 (fr)
CL (1) CL2017003417U1 (fr)
FI (2) FI20155528A (fr)
WO (1) WO2017005970A1 (fr)
ZA (1) ZA201800261B (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB945065A (en) * 1961-03-21 1963-12-18 Simonacco Ltd Improvements in and relating to rotary filters
US3358836A (en) * 1966-04-20 1967-12-19 Caterpillar Tractor Co Filter element indicator
US20070044656A1 (en) * 2005-08-31 2007-03-01 General Electric Company Methods and systems for detecting filter rupture
WO2012102662A1 (fr) * 2011-01-26 2012-08-02 Scania Cv Ab Cartouche de filtre à huile
WO2014170533A1 (fr) * 2013-04-17 2014-10-23 Outotec (Finland) Oy Appareil de filtre à disques et procédé de commande d'un filtre à disque
WO2014170532A1 (fr) * 2013-04-17 2014-10-23 Outotec (Finland) Oy Plaque filtrante, appareil à filtre à disques, et procédé pour commander un filtre à disques

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB945065A (en) * 1961-03-21 1963-12-18 Simonacco Ltd Improvements in and relating to rotary filters
US3358836A (en) * 1966-04-20 1967-12-19 Caterpillar Tractor Co Filter element indicator
US20070044656A1 (en) * 2005-08-31 2007-03-01 General Electric Company Methods and systems for detecting filter rupture
WO2012102662A1 (fr) * 2011-01-26 2012-08-02 Scania Cv Ab Cartouche de filtre à huile
WO2014170533A1 (fr) * 2013-04-17 2014-10-23 Outotec (Finland) Oy Appareil de filtre à disques et procédé de commande d'un filtre à disque
WO2014170532A1 (fr) * 2013-04-17 2014-10-23 Outotec (Finland) Oy Plaque filtrante, appareil à filtre à disques, et procédé pour commander un filtre à disques

Also Published As

Publication number Publication date
BR212018000147Y1 (pt) 2021-08-31
BR212018000147U2 (pt) 2018-07-24
FI20155528A7 (fi) 2017-01-04
CL2017003417U1 (es) 2018-04-20
FI20155528A (fi) 2017-01-04
FI20180107A1 (en) 2018-09-19
BR212018000147Y8 (pt) 2023-02-07
CN208161158U (zh) 2018-11-30
ZA201800261B (en) 2019-02-27

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