Classifications

• • 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 for producing a cement, wherein at least one millbase is ground in at least two devices for grinding to different ground millbase with mutually different particle size distributions, the ground millbase separated from each of the at least two devices for grinding separately, each with its own prepare for producing a cement, wherein at least one millbase is ground in at least two devices for grinding to different ground millbase with mutually different particle size distributions, the ground millbase separated from each of the at least two devices for grinding separately, each with its own bombard slaughterstrom is supplied to one of at least two rod sifters, in each of the at least two rod sifter classified a fine material fraction and a coarse grain fraction is discharged.
• a broadened particle size distribution can be achieved by operating at least two similar Kreislaufmahlanlagen. Differences in the roller presses used (in particular in the contact forces) and the rod basket sifters (in particular with regard to speed and dimensions) make it possible to produce different, steep particle size distributions. From DE 10 2008 019 830 A1 a Umnachlzmahlstrom with roller press, static caution and dynamic classifier is known, it is possible to operate in order to increase the throughput several similar systems parallel to each other. From WO 2009/068465 A1 a Kreislaufmahlstrom is known, which is composed of a plurality of roll presses and corresponding classifiers.
• the object of the invention is therefore to provide a method for producing a cement, which overcomes the disadvantages of the prior art.
• At least two grinding devices at least one grinding stock suitable for cement production is ground and that the ground grinding material suspended in separate classifying air streams is in each case fed pneumatically to a dynamic bar basket classifier.
• a separation of a coarse grain fraction (grits) and a fine grain fraction is achieved.
• the grits are taken away.
• the fine material fractions which are located in the rod basket sifters are discharged from the respective classifying air streams into a common discharge device.
• the classifying air streams flow together.
• the resulting flow field inside the discharge device swirls the fine material particles and leads to a uniform mixing of the fine material fractions from the individual rod basket separators.
• the at least two devices for grinding mutually different millbase for example cement clinker, metallurgical or slag sand, limestone and / or gypsum, is supplied. If at the same time different starting materials are supplied to the devices for grinding as the respective ground material, this can influence the composition of the cement or cement raw meal.
• roller presses As devices for grinding.
• Operating characteristics of roller presses and the nature of the comminuted fresh produce are well known in cement production.
• roller presses lead to steep particle size distribution curves.
• the desired widened particle size distribution can easily be achieved for the common fine product product.
• a composition of a coarser and a finer fines content in the common fine product can be produced, resulting in a high strength of cement.
• the inventive method is not limited to the use of roller presses. It is possible, in their place, to use other devices known from cement production for grinding regrind, in particular ball mills (tube mills), vertical mills and impact hammer mills. This makes it possible, not least for testing and development purposes, to carry out additional influencing of the particle size distribution in the common fine product product that is fundamentally made possible by the method according to the invention.
• the ground material to be ground from the at least two devices for grinding is not directed directly into the dynamic rod basket sifter, but first subjected to a pre-seal.
• the crushed regrind is in each case in a static Caution entered.
• Caregivers are used in the process of cement production to separate coarse material located in the material to be ground. These are coarse material residues that were not crushed during the grinding process.
• the coarse grain fractions (Greek discharge) discharged from the at least two rod basket sifters to the devices for grinding.
• Such recirculation of the semolina discharge offers the known economic advantages of Kreislaufmahlanlagen.
• the individual grinding cycles are run separately from each other, i. the coarse grain fraction from a rod basket sifter is returned to the corresponding apparatus for grinding, from which forth this Stabkorbsichter also flows the reformgut.
• the at least two rod cage separators are separately but in only one housing. This allows an economical material cost for the housing construction of the rod basket sifter and takes up the least space for the devices for sifting.
• two rod cage sifters are preferably coaxially stacked for dynamic reasons.
• Figure 2 an inventive method for producing a cement in
• Figure 3 shows an inventive method for producing a cement in an embodiment as a Kreislaufmahlstrom, in the embodiment with two designed as roller presses devices for grinding, two shown in vertical section Stabkorbsichtern in separate cases and with caution in two static cautionary;
• FIG. 4a shows a method according to the invention for producing a cement in the
• Figure 4b an inventive method for producing a cement in
• FIG. 5 Section of the inventive method for producing a cement, in vertical section representing the embodiment with two rod basket separators in a common housing.
• the inventive method for producing cement is shown schematically for the embodiment in which two roller presses 1, 2 are used as devices for crushing the at least one ground material.
• the Austragsgut from the roller presses 1, 2 is pneumatically introduced in each case with a prepare for crushing the at least one ground material.
• the Austragsgut from the roller presses 1, 2 is pneumatically introduced in each case with a sortluftstrom 3a, 3b in the housing 6a, 6b each of a dynamic Stabkorbsichters 4, 5.
• Each of the two rod sifter 4, 5 has its own, speed-adjustable drive 24a, 24b, which puts him about its longitudinal axis in a rotational movement.
• Speed and direction of rotation of the two rod basket sifter 4, 5 can be controlled independently.
• the millbase suspended in the classifying air flows laterally toward the respective rod basket classifier 4, 5 and is accelerated by the rotational movement of the rod basket classifier 4, 5 into its zone of vision.
• the centrifugal forces acting on the particles of the prepareguts lead in cooperation with the frictional force of the air flow to a separation of the prepareguts in each case a coarse grain fraction 7, 8 (Grape) and each a fine material fraction 9, 10.
• the coarse grain fractions 7, 8 are from the Stabkorbsichtern 4, 5 discharged due to gravity down from the respective reformzone (Gr manstrag).
• the selected fine material fractions 9, 10 are pneumatically transported by the respective classifying air stream from the respective rod basket sifter 4, 5 and both reach the discharge device 11.
• a unification of the previously separated classifying air streams occurs in the discharge device 11.
• the merging of the classifying air flows leads to a turbulent flow dynamics in the interior of the discharge device 11. This results in a turbulence and, as a consequence, a uniform mixing of the fine material fractions 9, 10 suspended in the classifying air streams into a homogeneous finished product with a correspondingly matched particle size distribution.
• the separator 13 is the fine material 14 separated from the classifying air stream 15 and can be stored in silos in the further process of cement production (not in the picture).
• FIGS. 4a and 4b show exemplary embodiments of the method according to the invention for producing a cement with a roller press 1 and a ball mill 16 (FIG. 4a) or with a vertical mill 17 and an impact hammer mill 18 (FIG. 4b).
• the method and construction are as in FIG. 1.
• FIG. 2 based on the exemplary embodiment of FIG. 1, a method according to the invention for the production of a cement is schematically illustrated, in which the material to be removed from the roller presses 1, 2 undergoes a pre-sealing before it is guided into one of the rod cage classifiers 4, 5.
• the discharge material flow 20a, 20b from each roller press 1, 2 is in each case supplied to a static cauterizer 21, 22.
• the discharged into a static cauterizer 21, 22 Austragsgut is separated into this in a fraction of fines 27a, 27b of the static Beicassers 21, 22 and a coarse material fraction, which leaves on the way Grobgutab Entry 26a, 26b, the static cautery 21, 22.
• the separated fines 27a, 27b of the static cauterizer 21, 22 is pneumatically with a classifying air stream 19a, 19b in each one of the rod basket classifier 4, 5 passed.
• the Austragsgutströme 20a, 20b from the roller presses 1, 2 are each passed into the corresponding static caution 21, 22.
• the coarse material discharge discharged into the coarse material removal lines 26a, 26b of the static cauterizers 21, 22 can - not shown in the figure - be brought together with fresh material directly or after further pre-grinding and likewise fed back into the grinding cycle by way of the fresh material feeds 23a, 23b.
• FIG. 5 shows a detail of an embodiment of the method according to the invention, in which the two rod cage sifters 4, 5 are arranged in only one housing 6c. For dynamic reasons, a coaxial arrangement of the rod basket sifter 4, 5 is favorable, as shown.
• the rod basket separators 4, 5 are separated from each other by the respective reformulationstrom 3a, 3b flows.
• the fine material fractions 9, 10 pass separately into the discharge device 11, in which the classifying air streams are combined and the two fine material fractions 9, 10 are uniformly mixed.
• the method and structure are as in any one of Figures 1 to 4b.
• Rod basket sifter 20a, 20b Discharge stream a, 6b, 6c Housing 21 Static Caution
• Fine material fraction 24a, 24b Drive 0 Fine material fraction 25a, 25b Supply of coarse grain fraction

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• Engineering & Computer Science (AREA)
• Food Science & Technology (AREA)
• Crushing And Grinding (AREA)
• Combined Means For Separation Of Solids (AREA)
• Disintegrating Or Milling (AREA)

Priority Applications (2)

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Publications (1)

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Citations (3)

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• 2013
  • 2013-11-26 DE DE102013019840.2A patent/DE102013019840A1/de not_active Withdrawn
• 2014
  • 2014-11-21 EP EP14805222.8A patent/EP3074137B1/de not_active Not-in-force
  • 2014-11-21 DK DK14805222.8T patent/DK3074137T3/da active
  • 2014-11-21 WO PCT/EP2014/075308 patent/WO2015078787A1/de active Application Filing

Patent Citations (3)

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