US3524544A - Milling plant for sifting damp material - Google Patents

Milling plant for sifting damp material Download PDF

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Publication number
US3524544A
US3524544A US753958A US3524544DA US3524544A US 3524544 A US3524544 A US 3524544A US 753958 A US753958 A US 753958A US 3524544D A US3524544D A US 3524544DA US 3524544 A US3524544 A US 3524544A
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US
United States
Prior art keywords
sifter
sifting
chamber
scattering plate
materials
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
US753958A
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English (en)
Inventor
Heinz Jager
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.)
Westfalia Dinnendahl Groeppel AG
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Westfalia Dinnendahl Groeppel AG
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Filing date
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    • 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
    • B07B4/00—Separating solids from solids by subjecting their mixture to gas currents
    • B07B4/02—Separating solids from solids by subjecting their mixture to gas currents while the mixtures fall
    • B07B4/04—Separating solids from solids by subjecting their mixture to gas currents while the mixtures fall in cascades
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
    • B02C23/18—Adding fluid, other than for crushing or disintegrating by fluid energy
    • B02C23/20—Adding fluid, other than for crushing or disintegrating by fluid energy after crushing or disintegrating
    • B02C23/22—Adding fluid, other than for crushing or disintegrating by fluid energy after crushing or disintegrating with recirculation of material to crushing or disintegrating zone
    • 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
    • B07B4/00—Separating solids from solids by subjecting their mixture to gas currents
    • B07B4/02—Separating solids from solids by subjecting their mixture to gas currents while the mixtures fall
    • B07B4/025—Separating solids from solids by subjecting their mixture to gas currents while the mixtures fall the material being slingered or fled out horizontally before falling, e.g. by dispersing elements

Definitions

  • the present invention relates to a milling or grinding plant for processing and separating pulverulent damp materials such as, for example, limestone and the like.
  • Milling and crushing plants are known wherein the milled products delivered by a crusher and by a fine, precision grinding mill, for coarse and fine products, respectively, are supplied to a sitter or separator apparatus wherein the coarse pieces remaining on the sitter screen are returned to the grinding or crushing mill.
  • hot gases are supplied to the crusher and to the sifter or separator.
  • the present invention eliminates the above shortcomings of the prior art and aims to provide apparatus whereby the milled products of the crusher and of the fine mill are delivered separately to the sifter apparatus.
  • the dry product coming from the fine mill is supplied to a centrifugal rotating scattering plate located in the upper portion of the sifter apparatus.
  • moist material coming from the crusher which is somewhat coarser in nature, passes into a hot region, heated by hot gases and located in the lower portion of the sifter apparatus. In this manner, the damp or moist material from the crusher cannot impair the efiiciency of the sitting process and size separation which takes place in processing of the dry rotating material coming from the fine mill.
  • the sifter apparatus is constructed as a plurality of separate scattering plates located superimice posed, one above another and at a distance from each each other, each of two plates carrying out a different function.-Depending upon the particular conditions prevailing as to moisture content and grain size, and to adjust the desired scattering effect of the two plates in accordance with such prevailing conditions, it is preferable to provide each of the scattering plates with a variable speed drive.
  • the sifter can also be provided with sitting or distributing devices of different shapes, for example a conical or trickling type of sitting apparatus.
  • sitting or distributing devices of different shapes, for example a conical or trickling type of sitting apparatus.
  • a centrifugal scattering device or a device which allows the material to fall through the air slowly will also accomplish the desired purpose.
  • FIG. 1 The figure shown in the drawing is a schematic cross sectional view in elevation of the apparatus according to the invention.
  • the sitter apparatus of the invention is comprised of a first or upper sifter housing 1 which encloses a sitting chamber 1.
  • Circulating sifting air which entrains and thus assists in the separation of materials of various degrees of fineness, is supplied to the apparatus from a blower or ventilator fan 2, located on the outside of the housing 1.
  • the circulating air moves upwardly through the chambers 1' and 4 in a circulatory cycle, entering the lower or distributing chamber 4 from the side thereof at 40 through the pressure outlet duct 3 on the outlet side of the blower fan 2.
  • the circulating air enters the blower 2 through the suction inlet line 7 from the tops of cyclone separators 6 and 6a.
  • the circulating entraining air passes upwardly from the distributing chamber 4, through upper sifting chamber 1' and out of the sifter housing 1 into nipples or ducts 5 and 511, respectively, tangentially attached to the top of and leading into precipitating dust-collecting cyclones 6 and 6a in which the fine airborne material is precipitated and collected at pendulum-weighted receiving gates at 17 and 17a, respectively, located at the bottoms of the cyclone separators 6 and 6a, respectively.
  • a rotary or centrifugal scattering plate 8 driven in a rotary path from a shaft 9 above the scattering plate 8, the shaft in turn being driven by a motor 11 through a coupling and gear box 10.
  • the charged dry pulverulent material enters chamber 1' through a hopper (not shown) at 12 into a feed pipe or chute from which it drops on to the scattering plate 8 as the latter rotates,.
  • the inlet pipe connection at 12 supplies the scattering plate 8 with relatively dry fine pulverulent material.
  • a second scattering plate 13 disposed within the lower or distributing chamber 4 and supplied with damp moist coarser material which is fed in from the crusher through another hopper (not shown) by means of a feed pipe 14.
  • Hot gases are introduced laterally into the lower distribution or classifying chamber 4 from a source A of hot gases or hot air through a hot inlet pipe 15, preferably in a tangential direction relative to chamber 4. Exhaust gases exit from the sifter apparatus in the direction of arrow C through the exhaust gas outlet pipe 16 which is connected to the upper portion of the pressure duct 3 of the blower 2.
  • Operation of the sifter apparatus of the invention is as follows:
  • the dry pulverulent material, charged into the apparatus at 12, is thrown outwardly centrifugally by the rotating scattering plate 8 into the open space 1 of the upper sifting chamber 1.
  • Heavier and coarser particles drop down as shown at 42 for classification, sitting and sizing in lower chamber 4.
  • the fine material is airborne by the circulating sifter air and classified into coarser and finer grained material.
  • the finer material is airborne and follows the combined arrows 38 through ducts 5 and 5a and are precipitated out in the cyclone separators 6 and 6a from which the material drops down into pendulum weighted type discharge chutes or traps.
  • the damp or moist material charged separately at the chute 14, drops onto the second rotary scattering plate 13.
  • the scattering plate 13 discharges its moist material into the heated chamber 4 onto the conically shaped separators or trickle-type sifter devices.
  • the scattering plate 13 may rotate either at its own individual revolving r.p.m. speed, independently or at the same r.p.m. as plate 8.
  • the arrangement shown in FIG. 1 illustrates a drive shaft 44 separate but coaxial with shaft 9.
  • the scattering plate 13 is located within the distribution or classifying chamber 4 of the sifter apparatus. This arrangement permits a relatively long and intensive drying of the damp conveyed material entering at 14 to take place.
  • the damp material from charging chute 14 falls onto rotating scattering plate 13 directly in the path of the hot gases which enter into the distribution chamber 4 at duct 15 in the direction of arrow A.
  • the exhaust gases leaving the apparatus exist at 16 in the direction of arrow C through a dust filter (not shown).
  • the combination comprising a housing, first sifter means arranged in the upper portion of said housing for receiving and size-separation of relatively fine charged materials, second sifter means within said housing spaced below said first sifter means and arranged for receiving and size-separation of relatively coarse charged materials including said moist materials, feeding means arranged to feed separately the relatively fine materials to said first sifter means, and to feed separately said relatively coarse and said moist materials to said second sifter means, blower means located outside of said housing and communicating therewith, a source of hot gases connected to the lower portion of said housing for heating and drying the moist materials, and collecting means arranged in the lower portion of said housing for receiving dried materials from said second sifter means.
  • said first sifter means comprising a first scattering plate having a surface mounted for rotation in a generally horizontal plane so as to centrifugally eject materials outwardly therefrom, airclassifying means arranged for receiving materials centrifugally thrown from said first scattering plate, duct means extending from said air-classifying means to said blower and from said blower to said housing to thereby define a circulatory path.
  • said second sifter means comprising a second scattering plate having a surface mounted for rotation in a generally horizontal plane so as to centrifugal eject coarse and moist materials outwardly therefrom, and drive means for rotating said first and said second scattering plates.
  • said drive means including means for individually varying the rotational speed of said first and said second scattering plates respectively.
  • said sifter means comprising a plurality of vertically coaxial-conical surfaces mutually superimposed and arranged for causing gravity trickling of the materials.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Combined Means For Separation Of Solids (AREA)
  • Cyclones (AREA)
  • Drying Of Solid Materials (AREA)
US753958A 1967-08-21 1968-08-20 Milling plant for sifting damp material Expired - Lifetime US3524544A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19671607623 DE1607623A1 (de) 1967-08-21 1967-08-21 Mahlanlage fuer feuchtes Gut

Publications (1)

Publication Number Publication Date
US3524544A true US3524544A (en) 1970-08-18

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ID=5681414

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Application Number Title Priority Date Filing Date
US753958A Expired - Lifetime US3524544A (en) 1967-08-21 1968-08-20 Milling plant for sifting damp material

Country Status (5)

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US (1) US3524544A (de)
DE (1) DE1607623A1 (de)
ES (1) ES357330A1 (de)
FR (1) FR1578446A (de)
GB (1) GB1226620A (de)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3682302A (en) * 1969-03-01 1972-08-08 Paul Bernutat Air separator
US4288318A (en) * 1979-07-21 1981-09-08 Buhler-Miag Gmbh Pneumatic separator for flowable particulate materials
US4551241A (en) * 1984-02-08 1985-11-05 Sturtevant, Inc. Particle classifier
US4661244A (en) * 1985-04-25 1987-04-28 Firma Christian Pfeiffer Rotary basket air classifier
US4885832A (en) * 1988-07-07 1989-12-12 Sturtevant, Inc. Method of making a retrofit side draft classifier
US5215262A (en) * 1988-12-29 1993-06-01 O&K Orenstein & Koppel Ag Method and apparatus for comminuting bulk materials
US6207673B1 (en) 1997-03-12 2001-03-27 The University Of North Carolina At Chapel Hill Covalent conjugates of topoisomerase I and topoisomerase II inhibitors
US20160327338A1 (en) * 2013-12-31 2016-11-10 Kunming Tekang Technology Co., Ltd. Circulating fluidized bed apparatus
US20240074355A1 (en) * 2022-05-13 2024-03-07 Seoul National University R&Db Foundation Apparatus for automatically separating fine-sized seeds

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3521491A1 (de) * 1985-06-14 1986-12-18 Krupp Polysius Ag, 4720 Beckum Verfahren und anlage zur feinzerkleinerung von gut
DE3844181A1 (de) * 1988-12-29 1990-07-05 Orenstein & Koppel Ag Einrichtung zum zerkleinern und klassieren schuettfoermiger gueter
JP2920876B2 (ja) * 1996-04-18 1999-07-19 川崎重工業株式会社 竪型ローラミルによるセメントクリンカの粉砕装置および方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT70084B (de) * 1912-11-18 1915-10-11 Arthur Anker Luftsichter.
US1746686A (en) * 1928-06-23 1930-02-11 Sturtevant Mill Co Air separator
US2199015A (en) * 1937-12-15 1940-04-30 Comb Eng Co Inc Combined drier and separator
US2658615A (en) * 1949-03-19 1953-11-10 Babcock & Wilcox Co Separator drying method and apparatus for moisture carrying material
US2956347A (en) * 1957-07-23 1960-10-18 Combustion Eng Drying method and apparatus

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT70084B (de) * 1912-11-18 1915-10-11 Arthur Anker Luftsichter.
US1746686A (en) * 1928-06-23 1930-02-11 Sturtevant Mill Co Air separator
US2199015A (en) * 1937-12-15 1940-04-30 Comb Eng Co Inc Combined drier and separator
US2658615A (en) * 1949-03-19 1953-11-10 Babcock & Wilcox Co Separator drying method and apparatus for moisture carrying material
US2956347A (en) * 1957-07-23 1960-10-18 Combustion Eng Drying method and apparatus

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3682302A (en) * 1969-03-01 1972-08-08 Paul Bernutat Air separator
US4288318A (en) * 1979-07-21 1981-09-08 Buhler-Miag Gmbh Pneumatic separator for flowable particulate materials
US4551241A (en) * 1984-02-08 1985-11-05 Sturtevant, Inc. Particle classifier
US4661244A (en) * 1985-04-25 1987-04-28 Firma Christian Pfeiffer Rotary basket air classifier
US4885832A (en) * 1988-07-07 1989-12-12 Sturtevant, Inc. Method of making a retrofit side draft classifier
US5215262A (en) * 1988-12-29 1993-06-01 O&K Orenstein & Koppel Ag Method and apparatus for comminuting bulk materials
US6207673B1 (en) 1997-03-12 2001-03-27 The University Of North Carolina At Chapel Hill Covalent conjugates of topoisomerase I and topoisomerase II inhibitors
US6420377B1 (en) 1997-03-12 2002-07-16 The University Of North Carolina At Chapel Hill Covalent conjugates of topoisomerase I and topoisomerase II inhibitors
US20160327338A1 (en) * 2013-12-31 2016-11-10 Kunming Tekang Technology Co., Ltd. Circulating fluidized bed apparatus
US10612843B2 (en) * 2013-12-31 2020-04-07 Kunming Tekang Technology Co., Ltd. Circulating fluidized bed apparatus
US20240074355A1 (en) * 2022-05-13 2024-03-07 Seoul National University R&Db Foundation Apparatus for automatically separating fine-sized seeds

Also Published As

Publication number Publication date
DE1607623A1 (de) 1970-10-22
ES357330A1 (es) 1970-03-01
FR1578446A (de) 1969-08-14
GB1226620A (de) 1971-03-31

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