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WO2007090924A1 - Mecanisme de support de bras de rateau pour epaississeur - Google Patents

Mecanisme de support de bras de rateau pour epaississeur Download PDF

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Publication number
WO2007090924A1
WO2007090924A1 PCT/FI2007/000031 FI2007000031W WO2007090924A1 WO 2007090924 A1 WO2007090924 A1 WO 2007090924A1 FI 2007000031 W FI2007000031 W FI 2007000031W WO 2007090924 A1 WO2007090924 A1 WO 2007090924A1
Authority
WO
WIPO (PCT)
Prior art keywords
rake
arms
tank
rake arms
supporting member
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/FI2007/000031
Other languages
English (en)
Inventor
Richard Triglavcanin
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.)
Metso Corp
Original Assignee
Outotec 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 filed Critical Outotec Oyj
Priority to AU2007213629A priority Critical patent/AU2007213629A1/en
Priority to CA002638062A priority patent/CA2638062A1/fr
Publication of WO2007090924A1 publication Critical patent/WO2007090924A1/fr
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
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/18—Construction of the scrapers or the driving 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
    • B01D21/02—Settling tanks with single outlets for the separated liquid
    • B01D21/04—Settling tanks with single outlets for the separated liquid with moving scrapers
    • B01D21/06—Settling tanks with single outlets for the separated liquid with moving scrapers with rotating scrapers
    • 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 an apparatus for clarifying and/or thickening a solids- containing solution. Furthermore the invention relates to a rake arm supporting mechanism for a thickener.
  • the clarifying and thickening apparatus comprises a tank, into which the slurry to be clarified is fed via a feedwell, which is located in the centre of the clarification tank, generally in its upper section.
  • a feedwell which is located in the centre of the clarification tank, generally in its upper section.
  • Thickeners are known as a means of separating suspended pulps. They are commonly used in the field of mineral processing and extraction, as well as other industries such as paper production.
  • the diameter of the clarification tank could be ten times larger than that of the feedwell.
  • a flocculant used in clarification is fed into the feedwell. The flocculant is often mixed into the slurry while it is being fed into the feedwell.
  • the clarification or thickening tank may be equipped with a rake operating near the bottom, or function without one.
  • the rake is mounted on a centrally located drive shaft, driven by a motor and an associated gearbox.
  • the clarified liquid, or overflow is removed from the clarification tank as an overflow and the thickened slurry, or underflow, is removed from the central part of the tank bottom, to where it has been moved by the rake arms.
  • the bottom of a thickening tank is usually inclined, i.e. sloping down towards the centre, whereby the removal of solids is made easier.
  • the number of arms in the rake can be varied depending on the design solution. Some of the rake arms may be the length of the tank radius, others may be shorter.
  • this rake in practice tends to push the whole or part of the settled material around with it, thus preventing it from performing its functions of assisting in the dewatering process and raking the settled solids to the central discharge point.
  • This condition is referred to in the art as "donutting" and impedes the formation of the desired bed of relatively uniform, thickened pulp.
  • donuts start from the centre and grow outwards. That is when a pulp stabilisation mechanism is needed for preventing the rotating of the thickened pulp. It is near the drive shaft and in the centre of tank where pulp stabilisation mechanism is required the most. To be most effective the pulp stabilisation mechanism also needs to be at maximum depth into the bed to have maximum contact with the pulp bed.
  • the support of the rake arms in a thickener is implemented so that the sets of separate support cables and separate torque cables extend between rotating strusses and rake arms.
  • Cable torque has pivoting rake arms and the cable supports are attached to some support member.
  • Some bed slump issues can also occur as higher angle bed is achieved when rake arm is tilted upwards.
  • the purpose of the present invention is to provide a new kind of apparatus for clarifying and/or thickening a solids-containing solution and to introduce a new way to support rake arms and a rake of a thickener. Furthermore the object is to provide a more effective way to support the rake mechanism, which leaves the space for pulp stabilization mechanism around the drive shaft and could be fitted into thickeners having a small floor slope.
  • the invention relates to an apparatus for clarifying and/or thickening a solids- containing solution, whereby the apparatus comprises a clarification and/or settling tank, which is equipped with a feedwell for the slurry to be settled, a discharge launder for the clarified solution or overflow, and discharge ports for removing the thickened slurry and a rake rotating on its drive shaft, which is for moving the underflow from the edges of the tank to the centre, where said rake has at least four rake arms reaching the edge of the tank in a radial direction, when at least two of the rake arms are vertically supported by at least one vertical supporting member arranged on the rake arm, which vertical supporting member is connected to at least two rake arms, so that the rake arm slope 22 could be as small as possible, at least 1 :4 or smaller.
  • the thickeners having smaller rake arm slope than 1 :4 could be used advantageously.
  • the tank floor slope gets smaller there is much more vertical support needed in the rake arms in order the rake arms to be parallel with the tank floor.
  • the invention also relates to a method for supporting a rake in an apparatus for clarifying and/or thickening a solids- containing solution, whereby the apparatus comprises a clarification and/or settling tank, which contains a feedwell, which settles the slurry, when the clarified solution or overflow is removed by a discharge launder, and when the thickened slurry is removed by discharge ports and a rake rotates on its drive shaft, which rake moves the underflow from the edges of the tank to the centre, where said rake has at least four rake arms reaching the edge of the tank in a radial direction, when at least one vertical supporting member arranged on at least two of the rake arms is connecting the supported rake arms to at least two rake arms, which gives a vertical support to the rake, and when the rake arm slope could be as small as possible, at least 1 :4 or smaller.
  • the rake arm supporting system of the invention is self supporting, torque is applied via the drive shaft.
  • Fig. 1 is a side view illustration of a preferred embodiment of the invention
  • Fig. 2 is a side view illustration from Fig 1
  • Fig. 3 is a three-dimensional illustration of a preferred embodiment of the invention
  • Figures 1 and 2 show an apparatus 1 for clarifying and/or thickening a solids- containing solution such as finely ground ore suspended as pulp in a suitable liquid medium, such as water.
  • Figure 3 is a three-dimensional illustration of a preferred embodiment of the invention.
  • the apparatus 1 comprises a clarification and/or settling tank 2 for containing liquid pulp 4, which tank has right cylindrical sidewalls 7 and centrally downwardly sloping floor 8.
  • Tank floor slope means how much the floor 8 slopes towards the drive shaft 9, which is centrally rotatably mounted within the tank 2.
  • Tank floor slope is the same than rake arm slope 22, slope could be for example less than 1 :4, like 1 :6.
  • An apparatus 1 is for recycling some of the dilute liquid (liquor) overflow from the top of the thickener tank 2 back to the feedwell 3 in order to dilute the inflowing pulp.
  • a feedwell 3 is for the slurry 4 to be settled.
  • the feedwell 3 is located centrally in the tank 2, which feedwell is supplied via a feed line.
  • the feedwell has a restricted bottom opening in fluid communication with the tank 2, and through which a liquid pulp in the feedwell can flow into the tank.
  • An overflow launder 6 for the clarified solution 20 or overflow surrounds the tank and channels the excess overflow liquor to a discharge pipe.
  • a flocculant agent is added and mixed into the suspension.
  • the flocculation takes place in the feedwell, whereby a bed of thickened pulp settles to displace an upper layer of relatively dilute liquid towards the top of the tank.
  • the thickened slurry is removed from below through discharge ports 5 like underflow withdrawal pipes.
  • An apparatus 1 contains a rake 10 rotating on its drive shaft 9, which rake moves the underflow from the edges of the tank to the centre, where said rake has at least four rake arms 11, 12, 13 and 14 reaching the edge of the tank in a radial direction.
  • Each arm 11 , 12, 13 and 14 supports an array of blades 21 extending axially into the tank 2.
  • the rake rotates and the blades 21 sweep through the fluid to shear the pulp particles, allowing the release of trapped water, which rises to the surface through the sheared material. This, in turn, allows the solids to settle into a more dense bed of thickened pulp.
  • the thickened pulp displaces an upper layer of liquid 20, which is drawn off through an overflow launder 6, extending circumferentially around the tank. The thickened pulp is drawn off below through discharge ports 5 included at the base of the tank.
  • the rake 10 has at least four rake arms 11 , 12, 13 and 14 reaching the edge of the tank 2 in a radial direction.
  • two of the rake arms 11 , 12 are vertically supported by one vertical supporting member 15 arranged on the rake arm, which vertical supporting member 15 is connected to other two rake arms 13,14, so that the rake arm slope 22 could be as small as possible, at least 1:4 or smaller.
  • a vertical supporting member 15, such as steel rod or pipe being welded or attached by fastening elements on the rake arm is connected to the rake arms 11 , 12, 13 or 14 by tying element 16 or 23 made of steel for example.
  • the tying element 23 connects the vertical supporting member 15 with the rake arms 11 and 12 and the tying element 16 connects the vertical supporting member 15 with the rake arms 13 and 14.
  • a rake 10 consists of four rake arms
  • the shorter rake arms 11 , 12 have the length half of the longer rake arms 13, 14.
  • a vertical supporting member 15 is arranged on the end point 17 of the shorter rake arm 11 , 12, which is opposite to the drive shaft 9.
  • the vertical supporting member 15 is connected to the longer rake arm 13, 14 on the point, which is half away of the radius 18 of the tank.
  • the angle 19 between adjacent rake arms is 90 degrees.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Paper (AREA)
  • Colloid Chemistry (AREA)
  • Mixers Of The Rotary Stirring Type (AREA)
  • Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)
  • Treatment Of Sludge (AREA)
  • Separation Of Solids By Using Liquids Or Pneumatic Power (AREA)

Abstract

L'invention concerne un appareil (1) de clarification et / ou d'épaississement d'une solution contenant des solides, ledit appareil étant équipé d'un râteau (10), ledit râteau servant à déplacer les sédiments des bords de la cuve vers le centre, ledit râteau possédant au moins quatre bras (11, 12, 13, 14) de râteau atteignant le bord de la cuve dans une direction radiale, au moins deux des bras de râteau (11, 12) étant supportés verticalement par au moins un élément (15) de support vertical disposé sur le bras de râteau, ledit élément (15) de support vertical étant relié à au moins deux bras (13,14) de râteau, de sorte que la pente (22) des bras de râteau est aussi réduite que possible, de l'ordre de 1:4 ou inférieure. L'invention concerne également un procédé de support d'un râteau (10).
PCT/FI2007/000031 2006-02-10 2007-02-09 Mecanisme de support de bras de rateau pour epaississeur Ceased WO2007090924A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AU2007213629A AU2007213629A1 (en) 2006-02-10 2007-02-09 A rake arm supporting mechanism for a thickener
CA002638062A CA2638062A1 (fr) 2006-02-10 2007-02-09 Mecanisme de support de bras de rateau pour epaississeur

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI20060124 2006-02-10
FI20060124A FI118209B (fi) 2006-02-10 2006-02-10 Sakeutuslaitteen haranvarren kannatinmekanismi

Publications (1)

Publication Number Publication Date
WO2007090924A1 true WO2007090924A1 (fr) 2007-08-16

Family

ID=35953591

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI2007/000031 Ceased WO2007090924A1 (fr) 2006-02-10 2007-02-09 Mecanisme de support de bras de rateau pour epaississeur

Country Status (6)

Country Link
AU (1) AU2007213629A1 (fr)
CA (1) CA2638062A1 (fr)
FI (1) FI118209B (fr)
PE (1) PE20071123A1 (fr)
WO (1) WO2007090924A1 (fr)
ZA (1) ZA200806346B (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110882561A (zh) * 2019-12-06 2020-03-17 安徽盛世开元装备科技有限公司 一种中心传动与分段提耙结合的高效浓缩机
CN112547327A (zh) * 2020-11-20 2021-03-26 湖南柿竹园有色金属有限责任公司 一种高效水处理装置

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB384574A (en) * 1932-06-08 1932-12-08 Wilhelm Langen Improvements in connection with settling-tanks for thickening turbid liquids
FR765906A (fr) * 1933-12-21 1934-06-18 Kaolins Du Morbihan Perfectionnements aux appareils dits épaississeurs
GB421479A (en) * 1933-06-23 1934-12-21 John William Hartley Improvements in and relating to rotary scraping apparatus for sludge and settlement tanks
US2963157A (en) * 1953-01-09 1960-12-06 Kuss Kaethe Separation of solids from liquids by sedimentation
US3113100A (en) * 1958-03-08 1963-12-03 Richard P Moore Separating apparatus
WO2003000379A1 (fr) * 2001-06-25 2003-01-03 Outokumpu Oyj Procede et appareil de clarification de boue liquide

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB384574A (en) * 1932-06-08 1932-12-08 Wilhelm Langen Improvements in connection with settling-tanks for thickening turbid liquids
GB421479A (en) * 1933-06-23 1934-12-21 John William Hartley Improvements in and relating to rotary scraping apparatus for sludge and settlement tanks
FR765906A (fr) * 1933-12-21 1934-06-18 Kaolins Du Morbihan Perfectionnements aux appareils dits épaississeurs
US2963157A (en) * 1953-01-09 1960-12-06 Kuss Kaethe Separation of solids from liquids by sedimentation
US3113100A (en) * 1958-03-08 1963-12-03 Richard P Moore Separating apparatus
WO2003000379A1 (fr) * 2001-06-25 2003-01-03 Outokumpu Oyj Procede et appareil de clarification de boue liquide

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110882561A (zh) * 2019-12-06 2020-03-17 安徽盛世开元装备科技有限公司 一种中心传动与分段提耙结合的高效浓缩机
CN112547327A (zh) * 2020-11-20 2021-03-26 湖南柿竹园有色金属有限责任公司 一种高效水处理装置

Also Published As

Publication number Publication date
FI20060124A0 (fi) 2006-02-10
CA2638062A1 (fr) 2007-08-16
AU2007213629A1 (en) 2007-08-16
PE20071123A1 (es) 2007-11-20
FI118209B (fi) 2007-08-31
ZA200806346B (en) 2009-10-28

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