US3353674A - Apparatus for the wet-screening of particles - Google Patents

Apparatus for the wet-screening of particles Download PDF

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Publication number
US3353674A
US3353674A US385224A US38522464A US3353674A US 3353674 A US3353674 A US 3353674A US 385224 A US385224 A US 385224A US 38522464 A US38522464 A US 38522464A US 3353674 A US3353674 A US 3353674A
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US
United States
Prior art keywords
screening
launder
throat
sloping
sieve bend
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.)
Expired - Lifetime
Application number
US385224A
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English (en)
Inventor
Jan N J Leeman
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.)
Stamicarbon BV
Original Assignee
Stamicarbon BV
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 Stamicarbon BV filed Critical Stamicarbon BV
Application granted granted Critical
Publication of US3353674A publication Critical patent/US3353674A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • 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
    • B01D35/28—Strainers not provided for elsewhere
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
    • B03B5/00—Washing granular, powdered or lumpy materials; Wet separating
    • B03B5/48—Washing granular, powdered or lumpy materials; Wet separating by mechanical classifiers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B2230/00—Specific aspects relating to the whole B07B subclass
    • B07B2230/01—Wet separation

Definitions

  • the present invention relates to a screening apparatus for the wet-screening of particles and more particularly to improved apparatus of the tangentially fed, fixed bar screen type.
  • Apparatus of this type which is sometimes designated a sieve bend, comprises a stationary, cylinrically curved screening deck provided with .a supply end, a discharge end, and a screening surface extending between them and being provided with a large number of transversely extending screen openings.
  • the particles and the liquid to be separated are fed tangentially, as a layer, on to the concave side of the screening deck at an initial rate high enough to make an overflow fraction move from the supply end to the discharge end.
  • successive thin laminae of a thickness considerably less than the width of the screen openings are peeled off; the liquid and the particles which have a diameter smaller than the width of the openings pass through the openings as undersize.
  • a preferred embodiment of the sieve bend apparatus has a screening surface which consists of a large number of parallel bars set transversely t0 the direction of flow. These bars may be generally rectangular in transverse cross section. Accordingly they are mounted so as to have faces which are presented towards the supply end of the screening deck and which split oh the successive thin laminae to produce the sieve bend effect. If the particles in the liquid being screened are somewhat abrasive, the bar face edges become somewhat rounded in the course of time, which results in a decrease of the screening elliciency.
  • the bars and the deck are made symmetrical, so that upon reversal of the screening deck the desired lamina splitting can be effected by the faces of the bars which were originally presented towards the discharge end.
  • the length of the period between reversals depends on the material of which the screening deck is made and on the abrasiveness and volume of the influent particle-liquid mixture to which it is subjected.
  • the width of the inlet of most currently used sieve bend installations is generally made so large that it equals three times the maximum grain size of the raw product supplied thereto.
  • a slot width of this size obstruction of the slot is effectively prevented.
  • this often causes the coarser particles flowing along the upper surface of the raw product to be delivered to the screening deck so far below the supply end of the deck that not only will these particles fail to hit the screening deck at a tangent to the deck resulting in the discrimination being shifted to a larger particle size than is-desired, but also there will be additional wear of the screening deck at the point where these particles hit the deck. As a consequence, the life of the deck is shortened.
  • the vertical distance between the said slot-like spout and the upper end of the screening surface according to the invention is large and adjustable to ensure the desired screening effect.
  • a moregeneral object of the invention is the provision of an extremely simple, easily accessible, and conveniently arranged sieve bend construction, in which the screening deck is subjected to uniform wear and the overall height is minimized owing to the elimination of the necessity of providing a feeding trough with baffles in such installations to ensure the desired separation.
  • FIGURE 1 is a vertical longitudinal sectional view of the sieve bend installation according to the invention.
  • FIGURE 2 is a fragmentary vertical longitudinal sectional view of the sieve bend showing a modified arrangement of the feeding launder.
  • the open feeding launder 1 is provided near one end of the bottom thereof with a spout 2 communicating with a throat 3 of the sieve bend, generally indicated at 4.
  • the throat 3 is defined by a fixed, sloping wall 5 tangentially leading into the uper end of the curved screening deck 6 of the sieve bend 4 and by a movable wall comprising a resilient rubber plate 7, in such a way that the wall-5 and the plate 7 converge downwardly towards the sieve bend 4.
  • the wall 5 is preferably set at an angle in the range of 60 to from horizontal.
  • the plate 7 may alternately be made of other tough, flexible wear resistant material such as synthetic plastic sheet material.
  • the upper edge of the plate 7 is clamped at an angle to the vertical, although a hinged attachment is also within the purview of the invention.
  • the plate 7 effectively ensures that liquid and solid particles which might otherwise detach themselves from the layer flowing along wall 5 will be tangentially supplied to the screening deck 6.
  • the generally rectangular throat end at the lower end of the fixed sloping wall 5 and the lower end of the plate 7 will always adjust itself to the minimum area which will pass the influent particle containing liquid owing to the resilience of the plate material.
  • the screening deck 6 is preferably mounted so as to be reversible by turning it end for end to extend the life thereof.
  • the underflow fraction of the sieve bend 4 which passes in laminae between the bars thereof is collected in a collecting reservoir 8, which is communicated freely with the atmosphere along an upper portion of a side thereof.
  • the collected underflow fraction is discharged from the reservoir 8 through a suitable conduit (not shown).
  • the overflow fraction of the sieve bend 4 carrying the larger diameter particles is discharged via the sloping overflow plate 9.
  • the plate is preferably positioned at a delivery angle of about 30 from horizontal.
  • the bottom of the feeding launder 1 may slope towards the sieve bend at a small angle (a few degrees) in order to facilitate movement of the raw product therein.
  • launder 1 including the spout 2 is suspended over the throat by means of a detachable connection shown including a plurality of relatively long bolts 10.
  • the bolts 10 additionally enable the chute to be adjusted vertically.
  • the vertical distance between the opening 2 and the upper end of the screening surface 6 being adjusted empirically to ensure the desired screening effect. In practice, this distance may be about 0.5 meter.
  • the launder may alternately be connected to the sieve bend installation the other way round as shown in PEG- URE 2. This can be done in a simple way by releasing the bolts 10, lifting the launder spout out of the throat and turning it through 180 in the horizontal plane with respect to the throat.
  • the performance of the screening device according to the invention does not depend on the direction in which the material is supplied, because of the sloping wall 5 and the convergence and cross sectional area adaptability of the throat 3.
  • the walls of the launder, the spout 2, and the fixed sloping walls 5 and 9 are lined with wear-resistant material.
  • a feeding launder for receiving particle containing fluid, said launder being mounted above said throat, said launder having, a transversely elongated spout communicated thereto, said spout depending downwardly from said launder toward said throat.
  • Apparatus as set forth in claim 1 the improvement additionally including an underflow collecting reservoir mounted beneath said curved sieve bend screening surface, said reservoir being communicated to the atmosphere.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Developing Agents For Electrophotography (AREA)
  • Filtration Of Liquid (AREA)
  • Separation Of Solids By Using Liquids Or Pneumatic Power (AREA)
US385224A 1963-08-01 1964-07-27 Apparatus for the wet-screening of particles Expired - Lifetime US3353674A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL296114A NL296114A (enrdf_load_stackoverflow) 1963-08-01 1963-08-01

Publications (1)

Publication Number Publication Date
US3353674A true US3353674A (en) 1967-11-21

Family

ID=19754923

Family Applications (1)

Application Number Title Priority Date Filing Date
US385224A Expired - Lifetime US3353674A (en) 1963-08-01 1964-07-27 Apparatus for the wet-screening of particles

Country Status (6)

Country Link
US (1) US3353674A (enrdf_load_stackoverflow)
BE (1) BE651275A (enrdf_load_stackoverflow)
ES (1) ES302687A1 (enrdf_load_stackoverflow)
GB (1) GB1025619A (enrdf_load_stackoverflow)
NL (1) NL296114A (enrdf_load_stackoverflow)
OA (1) OA01007A (enrdf_load_stackoverflow)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3787318A (en) * 1972-04-20 1974-01-22 Marathon Oil Co Solids-liquid separator
US4085040A (en) * 1976-10-04 1978-04-18 The Bauer Bros. Co. Front feed static screen
US4826017A (en) * 1985-05-03 1989-05-02 Velmet (Proprietary) Limited Vibrating screen
AU629627B2 (en) * 1988-09-13 1992-10-08 Electric Power Research Institute, Inc. An apparatus for separating solid particles from a liquid medium
AU640318B2 (en) * 1990-04-17 1993-08-19 Electric Power Research Institute, Inc. Apparatus of the bend type
US5354467A (en) * 1988-09-13 1994-10-11 Electric Power Research Institute Sieve bend
CN110102465A (zh) * 2019-04-26 2019-08-09 天津市弘亚润滑粉制造有限公司 一种润滑粉制备过程中杂质筛分设备
US11260325B2 (en) * 2020-01-06 2022-03-01 Tongji University Filtering device for removing impurities in a mixture of biological diatomite

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB201211877D0 (en) * 2012-07-04 2012-08-15 Cde Global Ltd A screening apparatus

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE566362A (enrdf_load_stackoverflow) *
US1333127A (en) * 1916-10-28 1920-03-09 Charles P Nall Grain-separator
US2916142A (en) * 1953-12-24 1959-12-08 Stamicarbon Process and apparatus for separating particles according to size
US2995245A (en) * 1958-04-11 1961-08-08 Corn Products Co Separator feeding means
US3007574A (en) * 1958-06-09 1961-11-07 Stamicarbon Screening apparatus
US3116237A (en) * 1960-06-23 1963-12-31 Stamicarbon Apparatus for automatically draining off liquid-containing solid particles
US3145164A (en) * 1960-02-12 1964-08-18 Stamicarbon Apparatus for wet-screening a mixture of fine abrasive particles

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE566362A (enrdf_load_stackoverflow) *
US1333127A (en) * 1916-10-28 1920-03-09 Charles P Nall Grain-separator
US2916142A (en) * 1953-12-24 1959-12-08 Stamicarbon Process and apparatus for separating particles according to size
US2995245A (en) * 1958-04-11 1961-08-08 Corn Products Co Separator feeding means
US3007574A (en) * 1958-06-09 1961-11-07 Stamicarbon Screening apparatus
US3145164A (en) * 1960-02-12 1964-08-18 Stamicarbon Apparatus for wet-screening a mixture of fine abrasive particles
US3116237A (en) * 1960-06-23 1963-12-31 Stamicarbon Apparatus for automatically draining off liquid-containing solid particles

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3787318A (en) * 1972-04-20 1974-01-22 Marathon Oil Co Solids-liquid separator
US4085040A (en) * 1976-10-04 1978-04-18 The Bauer Bros. Co. Front feed static screen
FR2366069A1 (fr) * 1976-10-04 1978-04-28 Bauer Bros Co Appareil statique de tamisage
US4826017A (en) * 1985-05-03 1989-05-02 Velmet (Proprietary) Limited Vibrating screen
AU629627B2 (en) * 1988-09-13 1992-10-08 Electric Power Research Institute, Inc. An apparatus for separating solid particles from a liquid medium
US5354467A (en) * 1988-09-13 1994-10-11 Electric Power Research Institute Sieve bend
AU640318B2 (en) * 1990-04-17 1993-08-19 Electric Power Research Institute, Inc. Apparatus of the bend type
CN110102465A (zh) * 2019-04-26 2019-08-09 天津市弘亚润滑粉制造有限公司 一种润滑粉制备过程中杂质筛分设备
US11260325B2 (en) * 2020-01-06 2022-03-01 Tongji University Filtering device for removing impurities in a mixture of biological diatomite

Also Published As

Publication number Publication date
GB1025619A (en) 1966-04-14
NL296114A (enrdf_load_stackoverflow) 1965-05-10
ES302687A1 (es) 1965-01-01
OA01007A (fr) 1968-08-07
BE651275A (fr) 1965-02-01

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