EP0519535A1 - Dynamischer Sichter für pulverförmige Materialien, insbesondere Zement und eine einen solchen enthaltende Anlage - Google Patents

Dynamischer Sichter für pulverförmige Materialien, insbesondere Zement und eine einen solchen enthaltende Anlage Download PDF

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Publication number
EP0519535A1
EP0519535A1 EP92201462A EP92201462A EP0519535A1 EP 0519535 A1 EP0519535 A1 EP 0519535A1 EP 92201462 A EP92201462 A EP 92201462A EP 92201462 A EP92201462 A EP 92201462A EP 0519535 A1 EP0519535 A1 EP 0519535A1
Authority
EP
European Patent Office
Prior art keywords
separator
air
drums
drum
plant
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.)
Withdrawn
Application number
EP92201462A
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English (en)
French (fr)
Inventor
Paolo Catani
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.)
Italcementi SpA
Original Assignee
Italcementi SpA
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 Italcementi SpA filed Critical Italcementi SpA
Publication of EP0519535A1 publication Critical patent/EP0519535A1/de
Withdrawn legal-status Critical Current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
    • B07B7/00—Selective separation of solid materials carried by, or dispersed in, gas currents
    • B07B7/08—Selective separation of solid materials carried by, or dispersed in, gas currents using centrifugal force
    • B07B7/083—Selective separation of solid materials carried by, or dispersed in, gas currents using centrifugal force generated by rotating vanes, discs, drums, or brushes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
    • B02C17/18—Details
    • B02C17/183—Feeding or discharging devices
    • B02C17/1835—Discharging devices combined with sorting or separating of material
    • B02C17/185—Discharging devices combined with sorting or separating of material with more than one separator

Definitions

  • machines For the industrial separation of pulverulent products, particularly cement, machines have for some time known consisting of a selector in the form of a drum rotating about a vertical axis and comprising a plurality of selector blades mounted on its perimeter.
  • the material to be separated is fed and distributed over the selector so that it falls peripherally to the lateral surface of the drum, through which separation air passes transversely.
  • the final product (in particular cement) is entrained by the air passing through the drum and is recovered in a cyclone or filter.
  • the fineness of the final product depends on various parameters. The greater the flow rate and hence velocity of the air passing through the drum selector, the coarser the entrained particles, leading to a reduction in product fineness.
  • the resultant product is then unpopular with the user because it suffers from problems of excessively fast setting and poor workability.
  • a method of overcoming this problem could be to lower the cut-off point of the separator, hence losing precisely the advantage of these machines, or to improve the efficiency of the entire grinding plant to which they are connected.
  • a further method could be to produce two types of cement of different fineness in two parallel plants and then mix them in suitable proportions to vary the final particle size distribution. It is however expensive in terms of plant cost to provide a system for dividing the material feed along two parallel lines, and in addition involves problems of spatially accommodating the two lines, and difficulties in incorporating them into existing plants.
  • the object of the present invention is to effectively solve the problem of the product particle size distribution curve and hence the problem of product quality, without renouncing the high efficiency of known separators of rotary drum selector type.
  • a dynamic separator of rotary drum type for pulverulent materials, particularly cement characterised by comprising a pair of rotary drums arranged separately in series one above the other, each of said drums being traversed by its own air stream, which is fed independently into the separator and towards each drum through a spiral duct with its inlet and outlet possibly tangential, so that each air stream in passing through each drum causes the formation of two separate particle size fractions, namely a fine fraction which leaves from said tangential ducts and a coarse fraction which descends into the separator, hence producing a total of three particle size fractions.
  • Figure 1 is a schematic elevational view of a separator according to the invention.
  • Figure 2 is a view analogous to the preceding, showing a modified embodiment of a separator according to the invention.
  • Figures 3, 4 and 5 are sections respectively on the lines III-III, IV-IV and V-V of Figures 1 and 2.
  • Figure 6 is a schematic illustration of a grinding plant incorporating the separator shown in Figure 1.
  • Figure 7 shows a possible embodiment of a plant incorporating the separator of the invention shown in Figure 2.
  • a separator comprises a substantially cylindrical body traversed along its vertical axis by a shaft 19 with a variable speed drive 10.
  • the shaft 19 supports and drives a pair of separate rotary drums 3 and 6 rigid therewith, these being arranged in series one above the other within the separator.
  • drums carry perimetrally a plurality of selector blades arranged radially or inclined, their purpose being to separate the material fed into the separator above the upper drum 3 via vertical feed tubes 1, to fall peripherally to the lateral surface of the drum in the region of the blades.
  • an upper stator 31 and a lower stator 36 External to each of the two drums and facing them there are provided an upper stator 31 and a lower stator 36, these also being provided with a plurality of blades, their primary purpose being to generate a tangential component in the separation air stream.
  • a first separation air stream of flow rate P1 is fed into the top of the separator via a tangential inlet duct 4, which in the illustrated embodiment is of volute or spiral form.
  • a first fraction 13 of dust-laden air leaves from a duct 5 in the region above the drum 3.
  • the lower drum 6 is separated and sealed from the upper drum 3 by the conical plate 42, the base 43 and the rim 16.
  • a second separation air stream 14 (of flow rate P2) is fed into the lower region of the separator through a relative tangential inlet duct 7 which also extends in volute form, to leave from an outlet duct 8 as the second fraction 15 of dust-laden air.
  • the separator At its bottom the separator is provided with a discharge hopper 9 for the coarser rejected material 17, which leaves via the bottom of the separator from the region external to the second drum. This latter is supported by the shaft 19, via radial arms 44.
  • the principle of operation of the separator shown in Figure 1 is essentially as follows: the material to be separated 11 is fed to the separator via the feed tubes 1 and is distributed by the top 2 of the rotary drum 3.
  • the separation 12 air is fed into the tangential inlet duct 4 and passes through the material 11 distributed by the rotary drum 3 to emerge as dust-laden air 13 from the outlet duct 5.
  • the material suspended in the air 13 represents the first finished product, selected by the drum 3 driven at variable speed by the shaft 19. From the region external to the drum 3 the coarser material 17 falls onto the rim 16 and then in front of the second drum separator 6, which can differ from the first in its diameter and the height and number of its selector blades, according to the desired fineness of the product, which is traversed by the separation air 14 fed into the tangential inlet duct 7, to leave as dust-laden air 15 through the outlet duct 8.
  • the material suspended in this air represents the second final product, its fineness differing from that of the first final product because of the different dimensions of the second drum 6 and the different flow rate of the separation air 14.
  • the rejected coarse material 17 is evacuated from the underlying discharge hopper 9 to be recycled to the mill for further grinding.
  • Figure 2 shows a separator operating essentially according to the same principle but with the facility for varying the rotational speed of the lower drum 6 separately from that of the upper drum 3 by a suitable variable speed drive 18 which acts on a second shaft 19'.
  • Figure 6 shows a possible configuration of a grinding plant using the separator shown in Figure 1.
  • the material 26 to be separated is conveyed by an elevator 27 from a mill 25 to the separator 28.
  • the air 29 from the dust-collection stage of the mill 25 is used as the separation air for the upper stage, together if necessary with environmental air 30.
  • the air 13 leaving the upper stage is fed to a filter 32 and discharged via a stack 33, the first product 34 being collected in the bottom of the filter.
  • the separation air 35 of the lower stage leaves the separator as dust-laden air 15, which is subjected to dust removal in a cyclone 37 and recycled to the separator by a fan 38.
  • the second product 38 is discharged from the cyclone 37.
  • the fineness of the two products 34 and 38 can be adjusted by varying the rotational speed of the drums by means of the drive 10 and the flow rate of the separation air streams 29, 30 and 35 by means of the flow regulators 39 and 40 respectively.
  • the separated coarse material 17 is returned to the mill for further grinding.
  • the two products obtained can be used separately or combined to form a product of wider particle size distribution.
  • FIG. 7 A further embodiment of a plant according to the invention is illustrated in Figure 7, in which the air 14 for the lower separation stage is all environmental air and the dust-laden air 15 leaving said stage is subjected to dust removal in a filter 41 and discharged through a stack 48.
  • the fineness of the two products 17 and 45 is adjusted by varying the speed of the selectors of the two stages by means of the respective variable speed drives 10 and 18, and varying the flow rate of the separation air for the two stages by means of the flow regulators 46 and 47 respectively.
  • the two products 17 and 45 can be used separately as products of different fineness, or be combined to widen the particle size distribution curve of the resultant product.
  • the rejected coarse material 17 is returned to the mill for further grinding.

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Combined Means For Separation Of Solids (AREA)
  • Cyclones (AREA)
EP92201462A 1991-06-17 1992-05-22 Dynamischer Sichter für pulverförmige Materialien, insbesondere Zement und eine einen solchen enthaltende Anlage Withdrawn EP0519535A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI911651 1991-06-17
ITMI911651A IT1248066B (it) 1991-06-17 1991-06-17 Separatore dinamico per materiali polverulenti, in particolare cementoed impianto che lo comprende

Publications (1)

Publication Number Publication Date
EP0519535A1 true EP0519535A1 (de) 1992-12-23

Family

ID=11360128

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92201462A Withdrawn EP0519535A1 (de) 1991-06-17 1992-05-22 Dynamischer Sichter für pulverförmige Materialien, insbesondere Zement und eine einen solchen enthaltende Anlage

Country Status (3)

Country Link
EP (1) EP0519535A1 (de)
JP (1) JPH05146758A (de)
IT (1) IT1248066B (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0610000A2 (de) * 1993-02-04 1994-08-10 F.L. Smidth & Co. A/S Verfahren zum Behandeln von pulverförmigem Material
FR2746329A1 (fr) * 1996-03-22 1997-09-26 Fcb Procede et installation pour la production simultanee et en continu de plusieurs fractions granulometriques d'une matiere minerale
EP1004366A2 (de) * 1998-11-27 2000-05-31 HOSOKAWA ALPINE Aktiengesellschaft & Co. OHG Windsichter
WO2009043510A2 (de) * 2007-09-29 2009-04-09 Holcim Technology Ltd. Verfahren zur herstellung von portlandhüttenzementen und hochofenzement
DE102015104340A1 (de) * 2015-03-23 2016-09-29 Maschinenfabrik Gustav Eirich Gmbh & Co. Kg Formsandkühler

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006017472A1 (de) * 2006-04-13 2007-10-18 Nied, Roland, Dr. Ing. Verfahren zur Erzeugung feinster Partikel mittels einer Strahlmühle
CN104368528B (zh) * 2014-11-17 2017-01-11 王树波 一种高精度的控制粒度分布的分离器
CN107497679B (zh) * 2017-08-22 2024-06-04 南京西普国际工程有限公司 分选装置

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0209663A1 (de) * 1985-06-14 1987-01-28 Krupp Polysius Ag Verfahren und Anlage zur Feinzerkleinerung von Gut
EP0226987A2 (de) * 1985-12-21 1987-07-01 O & K Orenstein & Koppel Aktiengesellschaft Vorrichtung zum Klassieren von staubförmigen Schüttgütern
EP0250747A2 (de) * 1986-06-25 1988-01-07 Christian Pfeiffer Maschinenfabrik GmbH & Co. Kommanditgesellschaft Verfahren zur Windsichtung und Windsichter
EP0374491A2 (de) * 1988-12-22 1990-06-27 Krupp Polysius Ag Sichter
DE3924826A1 (de) * 1989-07-27 1991-01-31 Kloeckner Humboldt Deutz Ag Sichter, insbesondere stabkorbsichter, zum sichten von koernigem gut in wenigstens drei fraktionen

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0209663A1 (de) * 1985-06-14 1987-01-28 Krupp Polysius Ag Verfahren und Anlage zur Feinzerkleinerung von Gut
EP0226987A2 (de) * 1985-12-21 1987-07-01 O & K Orenstein & Koppel Aktiengesellschaft Vorrichtung zum Klassieren von staubförmigen Schüttgütern
EP0250747A2 (de) * 1986-06-25 1988-01-07 Christian Pfeiffer Maschinenfabrik GmbH & Co. Kommanditgesellschaft Verfahren zur Windsichtung und Windsichter
EP0374491A2 (de) * 1988-12-22 1990-06-27 Krupp Polysius Ag Sichter
DE3924826A1 (de) * 1989-07-27 1991-01-31 Kloeckner Humboldt Deutz Ag Sichter, insbesondere stabkorbsichter, zum sichten von koernigem gut in wenigstens drei fraktionen

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS. vol. IA-22, no. 2, 1986, NEW YORK US pages 330 - 337; C. HERRMANN: 'Increased cement grinding efficiency by using high-efficiency separators' *

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0610000A2 (de) * 1993-02-04 1994-08-10 F.L. Smidth & Co. A/S Verfahren zum Behandeln von pulverförmigem Material
EP0610000A3 (de) * 1993-02-04 1995-02-01 Smidth & Co As F L Verfahren zum Behandeln von pulverförmigem Material.
FR2746329A1 (fr) * 1996-03-22 1997-09-26 Fcb Procede et installation pour la production simultanee et en continu de plusieurs fractions granulometriques d'une matiere minerale
WO1997035665A1 (fr) * 1996-03-22 1997-10-02 Fcb Procede et installation pour la production simultanee et en continu de plusieurs fractions granulometriques d'une matiere minerale
EP1004366A2 (de) * 1998-11-27 2000-05-31 HOSOKAWA ALPINE Aktiengesellschaft & Co. OHG Windsichter
EP1004366A3 (de) * 1998-11-27 2000-07-19 HOSOKAWA ALPINE Aktiengesellschaft & Co. OHG Windsichter
US6318561B1 (en) 1998-11-27 2001-11-20 Hosokawa Alpine Aktiengesellschaft & Co. Ohg Air classifier
WO2009043510A2 (de) * 2007-09-29 2009-04-09 Holcim Technology Ltd. Verfahren zur herstellung von portlandhüttenzementen und hochofenzement
WO2009043510A3 (de) * 2007-09-29 2009-06-18 Holcim Technology Ltd Verfahren zur herstellung von portlandhüttenzementen und hochofenzement
DE102015104340A1 (de) * 2015-03-23 2016-09-29 Maschinenfabrik Gustav Eirich Gmbh & Co. Kg Formsandkühler
US10124399B2 (en) 2015-03-23 2018-11-13 Maschinenfabrik Gustav Eirich Gmbh & Co. Kg Molding sand cooler

Also Published As

Publication number Publication date
ITMI911651A1 (it) 1992-12-17
IT1248066B (it) 1995-01-05
JPH05146758A (ja) 1993-06-15
ITMI911651A0 (it) 1991-06-17

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