EP0406591B1 - Verfahren und Anlage zur Zerkleinerung von Mahlgut - Google Patents

Verfahren und Anlage zur Zerkleinerung von Mahlgut Download PDF

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Publication number
EP0406591B1
EP0406591B1 EP90111135A EP90111135A EP0406591B1 EP 0406591 B1 EP0406591 B1 EP 0406591B1 EP 90111135 A EP90111135 A EP 90111135A EP 90111135 A EP90111135 A EP 90111135A EP 0406591 B1 EP0406591 B1 EP 0406591B1
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EP
European Patent Office
Prior art keywords
stage
grinding
classification
mill
grinding stage
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.)
Revoked
Application number
EP90111135A
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German (de)
English (en)
French (fr)
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EP0406591A3 (en
EP0406591A2 (de
Inventor
Osbert Richard Dipl.-Ing. Knobloch
Ludger Dr. Ing. Brentrop
Ludger Dipl.-Ing. Kimmeyer
Manfred Dipl.-Ing. Müller
Peter Wenningkamp
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ThyssenKrupp Industrial Solutions AG
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Krupp Polysius AG
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Publication date
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Application filed by Krupp Polysius AG filed Critical Krupp Polysius AG
Publication of EP0406591A2 publication Critical patent/EP0406591A2/de
Publication of EP0406591A3 publication Critical patent/EP0406591A3/de
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    • 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
    • B02C23/08—Separating or sorting of material, associated with crushing or disintegrating
    • B02C23/14—Separating or sorting of material, associated with crushing or disintegrating with more than one separator

Definitions

  • the invention relates to a method (according to the preamble of claim 1) and a system (according to the preamble of claim 11) for comminuting regrind.
  • DE-A-37 19 251 already discloses a process and a plant for the continuous pressure comminution of brittle ground material, such as e.g. Cement clinker, known.
  • brittle ground material such as e.g. Cement clinker
  • the material subjected to a material bed crushing and thereby crushed and pressed material is deagglomerated, and the sufficiently fine finished material is sorted out from the deagglomerated material in a sifter, while the coarse material is recirculated for a new material bed shredding.
  • the special feature of this known embodiment is seen in the fact that the material comminuted in a first roller mill or roller press is pressed or comminuted at least a second mill before it is deagglomerated in the roller gap of at least one further roller mill or roller press.
  • cements which are ground in a closed circuit with a material bed roller mill, deagglomerator and classifier or in roller bowl mills in terms of their quality properties do not correspond to those that are produced in ball mills.
  • the quality differences are expressed primarily in an increased water addition to the standard stiffness of the mortar compared to ball mill products.
  • this size is a measure of the water required by the concrete to achieve a certain consistency.
  • An increased water addition to the standard stiffness corresponds to an increased water requirement of the concrete. So far, one has to set a higher water-cement ratio for concrete that is produced with products from Gutbett roll mills or roller bowl mills in order to achieve the same processability. The result is a higher pore volume and accordingly a lower strength.
  • the quality differences mentioned are largely due to the narrower grain spectrum that products from Gutbett roll mills or roller bowl mills have compared to ball mill products.
  • the classification step is usually carried out immediately after the grist has once passed through the mill. This ideally fulfills the requirement of the shredding theory to remove the fine material generated from the cycle as quickly as possible in the interest of optimal energy utilization.
  • the regrind that is fed to the classifier accordingly contains much less fine material in grinding plants of this category than is the case in ball mill plants.
  • the usual measure for the fineness of cement, blast furnace flour and similar products is the mass-related surface according to Blaine. The higher this fineness, the higher the strength of those made from it Mortar and concrete.
  • the mass-related surface is inversely proportional to the average grain size (with the same mass-related surface, the narrower the product grain spectrum, the higher the strength defined in the relevant standards).
  • the finer its separation limit (see below) must be set so that the product has the desired mass-related surface. To compensate for the lack of fine, a corresponding portion of the coarse must be separated. The product grain spectrum is thus narrowed from both sides. As a result, the porosity of the product increases, and with the porosity the water requirement increases to achieve a certain mortar or concrete consistency.
  • the invention is therefore based on the object of designing a method (according to the preamble of claim 1) and an installation (according to the preamble of claim 11) in such a way that the particle size distribution of the finished product can be set in a targeted manner over a sufficiently large range (and in fact expressed) as a change in the pitch dimension n in the RRSB network - by at least 0.2), the products of such energy-saving grinding plants with respect to their grain size distribution and thus also with regard to their processing behavior and strength development to the standard of ball mill plants adapt the products produced and also to compensate for chemically (for example, due to the raw material) defects by appropriately adjusting the grain size distribution of the finished product.
  • At least 50%, but preferably 70 to 75%, of the throughput quantity of the grinding stage is returned to this grinding stage immediately after passing through the grinding stage (that is to say, for example, the material bed roller mill). Most of the circulation is thus transferred to the Gutbett roll mill. This multiplies the residence time in the grinding area, which is proportional to the circulation in the grinding zone (If, for example, 80% of the slugs are returned to the material bed roller mill, the ground material passes through the material bed roller mill on average five times). The same applies here again roughly analogously when using a roller mill.
  • the overall separation quality of a classification is characterized by the selectivity and the separation efficiency.
  • the selectivity says something about the width of the area in the grain spectrum, in which material can get into both the fine material and the coarse material. The narrower this area, the higher the selectivity. It is quantified by the ratio of the particle sizes for which 30% and 70% of the feed material in the coarse access ( “ ⁇ 30/70").
  • the separation efficiency relates to the proportion of the feed material that is classified at all, or the proportion that goes unclassified into the coarse material. The higher the latter, the lower the separation efficiency and the more fine particles remain in the coarse material.
  • the parameter for the unclassified portion is called " ⁇ ".
  • the combined use of the two features according to the invention brings about a reduction in the degree of increase n in the product grain size distribution in the RRSB network by more than 0.2 (from 1.2 to 0.95), which will be explained later using an example.
  • the mass-related surface (according to Blaine) of the subtracted from the grinding stage and fed to the classification stage is expediently 0.5 to 0.8 times the mass-related surface of the finished product (in the case of a conventional operating mode without return of the slugs, this range is 0.2 to 0.4 times as compared).
  • the mass-related surface (according to Blaine) of the fine material of one classifying unit (which supplies the finer component) is expediently 1.2 to 2.0 times the mass-based surface of the finished product, while the other classifying unit (which produces the coarser component) delivers a fine material, the mass-based surface of which is 0.4 to 0.8 times the mass-based surface of the finished product.
  • the regrinding of at least a partial flow of the fine material of the classification stage is possible in a ball mill.
  • the plant shown in FIG. 1 for comminuting regrind, in particular cement clinker contains a feed hopper 1 provided with metering devices, a material bed roller mill 2, a first material flow divider 3 provided with a metering device, a deagglomerator 4, a second material flow divider 5 and two classifying units 6 and 7.
  • a feed hopper 1 provided with metering devices
  • a material bed roller mill 2 a first material flow divider 3 provided with a metering device
  • a deagglomerator 4 a second material flow divider 5 and two classifying units 6 and 7.
  • the rest of the throughput which is not returned to the material bed roller mill, passes via the deagglomerator 4 to the second material flow divider 5, which divides the total material flow supplied to the classifying stage into the two classifying units 6 and 7.
  • the coarse material accumulating in the classifying units 6 and 7 is combined with the fresh regrind fed from the feed bunker 1 and the portion of scraps returned from the first material flow divider 3 fed to the feed shaft 2a of the material bed roller mill 2.
  • the fine material flows of the two classifying units 6 and 7, which are set to different fineness, are mixed with one another and form the finished product, which is characterized by a flat grain size distribution.
  • the exemplary embodiment according to FIG. 2 differs from the system according to FIG. 1 only in that the deagglomerator 4 is omitted.
  • a ball mill 8 is also provided, which is used for regrinding at least part of the fine material of the classifying stage formed by the classifying units 6 and 7.
  • Fig. 4 illustrates in a schematic representation, but based on the RRSB network, the product grain size distribution (curve a) that can be achieved with the method according to the invention in comparison to the conventional mode of operation (curve b), in which neither Schülpen Weglauf, nor a mixing of two fine material flows of different fineness take place.
  • the grain size d is plotted in ⁇ m on the abscissa and the sieve residue R is plotted in% on the ordinate.
  • a roller bowl mill can also be used in many cases for this grinding stage, as is illustrated by the basic diagram according to FIG. Even in a bowl mill, the regrind that passes through the grinding stage several times is crushed according to the principle of pressure crushing.
  • the plant according to the example in FIG. 5 is essentially of the same construction as the plant in FIG. 2, but with the difference that instead of the material bed roller mill 2, a roller bowl mill 12 forms the grinding stage here.
  • This roller-type bowl mill 12 is preferably a sightless roller-type bowl mill, to which the material to be shredded is fed in a known manner via an associated feed chute 12a and from which the shredded material - also in a manner known per se - via a material outlet 12b, downwards failing, discharged overall and in turn is fed to the first crop flow divider 3.
  • the circulation factor is 6.0;
  • the separation limit d50 of the classification is 13.5 ⁇ m;
  • the selectivity K 30/70 is 0.64;
  • the pitch n of the product grain size distribution is 1.20;
  • the position parameter d ' is 12 ⁇ m.
  • the circulation factor on the roughly set classifier is 1.6; the circulation factor on the finely adjusted classifier is 2.7; the total classifier circulation factor is 2.0; the separation limit d50 of the rough partial classification is 74 ⁇ m; the selectivity ⁇ 30/70 of the rough partial classification is 0.63;
  • the separation limit d50 of the fine classification is 18 ⁇ m; the selectivity ⁇ 30/70 of the fine partial classification is 0.63; the separation limit d50 of the total classification is 42 ⁇ m; the selectivity ⁇ 30/70 of the total classification is 0.37; the pitch n of the product grain size distribution is 0.92;
  • the position parameter d ' is 17.5 ⁇ m.

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
  • Disintegrating Or Milling (AREA)
EP90111135A 1989-07-03 1990-06-12 Verfahren und Anlage zur Zerkleinerung von Mahlgut Revoked EP0406591B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3921823A DE3921823A1 (de) 1989-07-03 1989-07-03 Verfahren und anlage zur zerkleinerung von mahlgut
DE3921823 1989-07-03

Publications (3)

Publication Number Publication Date
EP0406591A2 EP0406591A2 (de) 1991-01-09
EP0406591A3 EP0406591A3 (en) 1991-08-21
EP0406591B1 true EP0406591B1 (de) 1994-08-31

Family

ID=6384187

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90111135A Revoked EP0406591B1 (de) 1989-07-03 1990-06-12 Verfahren und Anlage zur Zerkleinerung von Mahlgut

Country Status (7)

Country Link
US (1) US5054694A (da)
EP (1) EP0406591B1 (da)
BR (1) BR9003131A (da)
DE (2) DE3921823A1 (da)
DK (1) DK0406591T3 (da)
ES (1) ES2059891T3 (da)
ZA (1) ZA904425B (da)

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4239602A1 (de) * 1992-11-25 1994-05-26 Krupp Polysius Ag Verfahren und Vorrichtung zur Zerkleinerung von Mahlgut
DK12893A (da) * 1993-02-04 1994-08-05 Smidth & Co As F L Fremgangsmåde til fremstilling af normal såvel som ultrafin cement
DE4307230A1 (de) * 1993-03-08 1994-09-15 Krupp Polysius Ag Verfahren und Anlage zur Gutbettzerkleinerung von sprödem Mahlgut
DE19522321A1 (de) * 1995-06-20 1997-01-02 Krupp Polysius Ag Verfahren zur Zerkleinerung von sprödem Mahlgut, insbesondere Hüttensand
DE19526040A1 (de) * 1995-07-17 1997-01-23 Krupp Polysius Ag Verfahren und Anlage zur Zerkleinerung von Mahlgut
FR2746329B1 (fr) * 1996-03-22 1998-05-22 Fcb Procede et installation pour la production simultanee et en continu de plusieurs fractions granulometriques d'une matiere minerale
DE60031807T2 (de) * 1999-06-24 2007-09-13 Donald E. St. Johns Maynard Vorrichtung zur Granulierung von Kunststoffen
DE19945646A1 (de) * 1999-09-23 2001-04-05 Krupp Polysius Ag Verfahren und Windsichter zum Klassieren von zerkleinertem Aufgabegut
DE10010406A1 (de) * 2000-03-03 2001-09-06 Kloeckner Humboldt Wedag Verfahren und Anlage zur zweistufigen Sichtung körnigen Gutes
AT5555U1 (de) * 2001-12-05 2002-08-26 Buzetzki Eduard Verfahren zur integrierten herstellung von putzen und mörtel sowie von kiesersatz
DE102005023950B4 (de) * 2005-05-20 2007-08-02 Omya Gmbh Anlage zur Herstellung disperser mineralischer Produkte
US7927417B2 (en) * 2008-02-04 2011-04-19 Capitol Aggregates, Ltd. Cementitious composition and apparatus and method for manufacturing the same
EP2313199B1 (de) 2008-07-02 2017-09-06 Bühler AG Vorrichtung und verfahren zur herstellung von mehl und/oder griess
CN102095883B (zh) * 2010-11-30 2013-03-06 辽宁同辉科技发展有限公司 自动化破碎研磨型制样工作站
DE102015001404B3 (de) * 2015-02-04 2016-08-04 Khd Humboldt Wedag Gmbh Kreislaufmahlanlage mit zwei Mahlvorrichtungen und Verfahren zum Betrieb der Kreislaufmahlanlage
CN104874442A (zh) * 2015-05-08 2015-09-02 贾方奎 一种改造辊压机加球磨机联合粉磨水泥系统

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH455615A (de) * 1966-10-31 1968-07-15 Escher Wyss Ag Mahl- und Sicht-Anlage, insbesondere für Zement
DE1607575B2 (de) * 1968-02-28 1976-09-30 Polysius Ag, 4723 Neubeckum Verfahren zum regeln einer sichtermahlanlage
DE3124649A1 (de) * 1981-06-23 1983-01-05 Krupp Polysius Ag, 4720 Beckum Verfahren zur regelung einer mahlanlage
DE3334235A1 (de) * 1982-11-04 1984-05-10 Heinz 4630 Bochum Jäger Verfahren und vorrichtung zur energiesparenden herstellung eines feingutes, insbesondere zement
DE3302176A1 (de) * 1983-01-24 1984-07-26 Klöckner-Humboldt-Deutz AG, 5000 Köln Verfahren und anlage zur kontinuierlichen druckzerkleinerung sproeden mahlgutes
DE3644342A1 (de) * 1986-12-23 1988-07-07 Krupp Polysius Ag Verfahren und anlage zur zweistufigen zerkleinerung von sproedem mahlgut
DD268893A1 (de) * 1986-12-31 1989-06-14 Architektur Bauwesen Hochschul Verfahren zur beeinflussung der austragskorngroessenverteilung bei geschlossenen zerkleinerungskreislaeufen
DE3711926A1 (de) * 1987-04-08 1988-10-27 Kloeckner Humboldt Deutz Ag Einrichtung zur zerkleinerung und mahlung sproeden mahlgutes wie z. b. zementklinker, erz, kohle oder dergleichen
DE3712147A1 (de) * 1987-04-10 1988-10-20 Krupp Polysius Ag Verfahren und anlage zur zerkleinerung von sproedem mahlgut
DE3717976A1 (de) * 1987-05-27 1988-12-08 Krupp Polysius Ag Verfahren und anlage zur zerkleinerung von mahlgut
DE3719251A1 (de) * 1987-06-10 1988-12-22 Kloeckner Humboldt Deutz Ag Verfahren und anlage zur kontinuierlichen druckzerkleinerung sproeden mahlgutes

Also Published As

Publication number Publication date
DE3921823A1 (de) 1991-01-17
EP0406591A3 (en) 1991-08-21
DK0406591T3 (da) 1995-01-16
ES2059891T3 (es) 1994-11-16
BR9003131A (pt) 1991-08-27
ZA904425B (en) 1991-03-27
EP0406591A2 (de) 1991-01-09
US5054694A (en) 1991-10-08
DE59006955D1 (de) 1994-10-06

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