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
  • B02C23/10—Separating or sorting of material, associated with crushing or disintegrating with separator arranged in discharge path of crushing or disintegrating zone
  • B02C23/12—Separating or sorting of material, associated with crushing or disintegrating with separator arranged in discharge path of crushing or disintegrating zone with return of oversize material to crushing or disintegrating zone
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
  • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
  • B02C21/00—Disintegrating plant with or without drying of the material
• • C—CHEMISTRY; METALLURGY
  • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
  • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
  • C04B7/00—Hydraulic cements
  • C04B7/36—Manufacture of hydraulic cements in general
  • C04B7/48—Clinker treatment
  • C04B7/52—Grinding ; After-treatment of ground cement
  • C04B7/527—Grinding ; After-treatment of ground cement obtaining cements characterised by fineness, e.g. by multi-modal particle size distribution
• • C—CHEMISTRY; METALLURGY
  • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
  • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
  • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
  • C04B2111/10—Compositions or ingredients thereof characterised by the absence or the very low content of a specific material
  • C04B2111/1075—Chromium-free or very low chromium-content materials
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
  • Y02P40/00—Technologies relating to the processing of minerals
  • Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding

Definitions

• the invention relates to a method for the production of Portland hut cements and blast furnace cement according to claim 1.
• Portland cement is known to be ground from clinker.
• the clinker is introduced together with a sulphate carrier, for example gypsum, in a cement mill, for example a good bed roller mill.
• a sulphate carrier for example gypsum
• CEM I 32.5 R the class of cement
• CEM I 42.5 R the class of cement
• CEM I 52.5 R the class of cement
• the latter is the one with the highest strength in the listed Portland cements
• it is also known to mill in two stages. Two-stage milling processes are also used to achieve higher mass flow rates coupled with significant energy savings. In a first milling stage, e.g.
• a good bed roller mill in circuit with a dynamic sifter.
• the discharge of the dynamic classifier is entered in the entry e.g. a ball mill as a second grinding step, which works in conjunction with another cyclic classifier in the circuit.
• the separated from the classifier finished product is discharged into appropriate reservoirs. Insufficiently comminuted regrind is thus guided to the entry of the second grinding stage.
• Mahlkugel supportiven results on the one hand from a different grinding resistance - for example from clinker about 12-16 kWh / t and of granulated slag about 18-22 kWh / t - and on the other hand from the upper grain size of the feed.
• Clinker is much coarser than, for example, granulated blastfurnace slag, which is very large grinding balls at the mill entry of a first grinding stage with 90 to 100 mm diameter required.
• a second grinding stage is able to work with balls of 30 to 20 mm diameter at the mill entry and 12 mm diameter at the discharge. It goes without saying that the ball diameter should decrease in the direction of the mill discharge.
• Portland cement is ground in one or two stages using one or two mills. With the help of one or two mills, a multi-component cement can also be produced. The components are ground either together or separately, in the latter case, a separate mixing stage is provided. For the grinding systems described a considerable amount of energy is required.
• a grinding plant which includes a pre-mill, in particular a good-bed roller mill, a first classifier for sighting in the Milled crushed material in a coarser and a finer fraction, a second classifier for sifting at least the finer fraction of the first classifier in coarse and fine material and a fine mill, in particular a ball mill, for grinding the coarse material of the second classifier has.
• the fine mill and the second classifier are connected via a conveying device which mechanically transports the material up to the second classifier.
• the invention has for its object to provide a method for the production of Portlandchristnzement and blast furnace cements, which can be carried out on energy-saving and the use value of the cement increasing manner.
• Portland cement clinker for grinding in a first mill the cement mill, registered.
• the Austragsgut the cement mill is given directly and / or via an intermediate reservoir in the entry of a dynamic classifier with preferably predetermined separation section.
• the coarse material of the dynamic classifier is given to the entry of a mill.
• granulated blastfurnace or granulated bread is additionally added.
• the material to be removed from the dynamic sifter is added to the feed of a second mill for fine grinding.
• the output material of the second mill is added to the entry of the dynamic classifier.
• Sulfate carrier is fed either to the entry of the first mill, the entry of the dynamic classifier or the entry of the second mill.
• the fines of the dynamic classifier are fed to a reservoir.
• this clinker flour with a fineness corresponding to the Portland cement is provided, this clinker flour together with a dried finely divided sulphate carrier will be added to the sifter.
• slag sand mills or cement mills can be considered.
• a vertical roller mill or a circulating ball mill can be used.
• Portland cement of the class CEM I 52.5 R from the classes CEM I 42.5 R or CEM I 32.5 R is grinded.
• a special cement of a high degree of fineness can also be obtained.
• the peculiarity of the method according to the invention is that the Portland cement is first fed to a dynamic sifter for a subsequent grinding, so that only the resulting classifier seed feeds the mill entry.
• Sulphate carrier can be ground together with clinker in the first mill.
• sulphate carrier is fed to the entry of the dynamic classifier.
• sulfate carrier is added to the entry of the second mill.
• an existing granulated blast-furnace sand mill which is better-greased for fine comminution, is used for refining, whose ball diameters are graduated, for example, from 40 mm to 17 mm.
• the process can be realized by a second stage for post-crushing in-use cement mill not at the entry of the mill, but according to the invention entry with, for example, a Vorzement (clinker flour plus finely divided sulfate carrier, dry) or with a Portland cement class CEM I 42.5 R or CEM I 32.5 R is charged.
• the possible ball diameters are between 25 mm and 12 mm or smaller. A higher energy efficiency is the result.
• FIG. 1 shows a block diagram of a two-stage grinding process according to the invention.
• FIG. 1 shows a two-stage grinding plant. From a clinker silo 20 and a sulphate carrier or gypsum silo 22, the materials to be milled are introduced into a first mill 24, which may be a ball mill, a good bed roller or a vertical roller mill. The output 25 of the mill 24 goes to the entry of a dynamic classifier 26. Its coarse grain returns at 28 to the entry of the first mill 24. The fines discharge 27 of the dynamic classifier 26 is based on a dynamic classifier 30. Alternatively, the discharging fines 27 of the classifier 26 in a silo 32, which is also connected to the entry of the dynamic classifier 30.
• a first mill 24 which may be a ball mill, a good bed roller or a vertical roller mill.
• the output 25 of the mill 24 goes to the entry of a dynamic classifier 26. Its coarse grain returns at 28 to the entry of the first mill 24.
• the fines discharge 27 of the dynamic classifier 26 is based on a dynamic class
• the coarse grain 39 from the dynamic classifier 30 enters the entry of the mill 40, which may be, for example, a ball mill, a vertical roller mill, or a stirred ball mill.
• the Kugelmühlengattierung is in this case for a fine and Feinstzerkleintation designed.
• the discharge of the mill 40 passes at 41 in the entry of the dynamic classifier 30.
• the fines of the dynamic classifier 30 is entered via the conveyor line 31 in a cement silo 42.
• This fine material is Portlandchristnzement or blast furnace cement high degree of fineness, which can be adjusted via the dynamic classifier 30 and the mill 40.
• the energy to be expended for the described process is significantly reduced in relation to conventional grinding plants.
• the balanced fine grinding mill for cement grinding consists of a single-chamber tubular ball mill 3.6 m Dmr. x 10.5m in length.
• Table 1 contains the essential parameters for the above embodiments.
• the required output data is taken from the recorded reference state (*), s. Table 1, column 2, and the Mahllesskennkurven the components, for example according to Zeisel or Bondtest.
• a predictive calculation model is used to calculate the grinding plant within the flowchart simulation.
• a suitable parameterized map is used to calculate the classifier flows: Particle size and unaddressed proportion as a function of feed fineness, load and classifier speed.

Landscapes

• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Ceramic Engineering (AREA)
• Food Science & Technology (AREA)
• Materials Engineering (AREA)
• Structural Engineering (AREA)
• Organic Chemistry (AREA)
• Crushing And Grinding (AREA)
• Disintegrating Or Milling (AREA)
• Curing Cements, Concrete, And Artificial Stone (AREA)

Applications Claiming Priority (2)

Publications (1)

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ID=40070612

Family Applications (1)

Country Status (8)

Families Citing this family (10)

Family Cites Families (14)

• 2007
  • 2007-09-29 DE DE102007046834A patent/DE102007046834B4/de not_active Withdrawn - After Issue
• 2008
  • 2008-09-24 AU AU2008306222A patent/AU2008306222A1/en not_active Abandoned
  • 2008-09-24 US US12/680,116 patent/US20100242805A1/en not_active Abandoned
  • 2008-09-24 BR BRPI0817617 patent/BRPI0817617A2/pt not_active Application Discontinuation
  • 2008-09-24 CA CA2701139A patent/CA2701139A1/en not_active Abandoned
  • 2008-09-24 WO PCT/EP2008/008066 patent/WO2009043510A2/de not_active Ceased
  • 2008-09-24 MX MX2010003507A patent/MX2010003507A/es unknown
  • 2008-09-24 EP EP08802548A patent/EP2193108A2/de not_active Withdrawn

Non-Patent Citations (1)

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