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
  • 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
• • 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
  • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
  • C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
  • C04B28/04—Portland cements
• • 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
  • C04B2111/1081—Chromium VI, e.g. for avoiding chromium eczema
• • 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
• • 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
  • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
  • Y02W30/00—Technologies for solid waste management
  • Y02W30/50—Reuse, recycling or recovery technologies
  • Y02W30/91—Use of waste materials as fillers for mortars or concrete

Definitions

• the invention relates to a process for the production of multicomponent cements according to claim 1 or 2 and to a plant for the production of multicomponent cements according to claim 12 or 13.
• Portland cements, blastfurnace cements and composite cements according to "EN-197/1" consist of at least the components to be cemented, cement clinker and granulated blastfurnace slag.
• the grinding of the mentioned binder components for the multicomponent cements takes place in suitable grinding plants, which are selected according to the component to be milled. It is therefore fundamentally different between cement mills on the one hand and granulated blastfurnace slabs on the other hand.
• ball mills come in as grinding units Consider, which are usually equipped with classifying armor today.
• the balls at the entry have a diameter of approximately 40 to 50 mm and at the discharge a diameter of approximately 17 mm.
• the balls In cement mills, the balls have a diameter of about 90 to 100 mm at the entry and a diameter of about 12 to 17 mm at the discharge.
• the largest ball diameter in a tube mill is determined by the grinding resistance and the upper grain size of the feed material.
• binder grinding equipment such as the roller mill, the good bed roller mill, the agitating ball mill or the like.
• the invention has for its object to provide a method and a system can be produced with the multi-component cements on energy-saving and the use value of the cements-enhancing manner.
• a component B of the multi-component cement granulated slag, ground in a grinding mill MB. Since this component is relatively difficult to grind, according to one embodiment of the invention, it will be ground in a slag grinding mill, for example in a conventional ball mill, a roller mill, a high-bed roller mill or the like.
• Portland cement is ground as component A in a cement grinding plant MA. This is, as stated above, designed for the grinding of clinker for the production of Portland cement. It is understood that in the invention, the Portland cement does not have to be ground in the same place as the component B. Rather, the Portland cement can be ground at any other location to subsequently transport it to the grinding site of component B. This is preferably done by loose transport.
• the mechanically discharged material to be ground from the grinding plant MB is fed to the entry of a dynamic separator with a set separating cut.
• dynamic classifiers are known in the production of cement or other powdery goods.
• the ground Portland cement is placed in the closed loop of the blast furnace grinding plant immediately before the dynamic classifier.
• the coarse material of the dynamic classifier now consisting of not yet sufficiently pure blastfurnace sludge and the particles to be refilled from the Portland cement, is returned to the entry of the grinding plant MB.
• the fines of the dynamic classifier forms the multicomponent cement.
• the component B is ground in a throughput grinding plant MBD having an entry and a discharge, and Portland cement as component A is introduced as component A into a cement grinding plant MA.
• Portland cement becomes component A in the longitudinal direction of the MBD at one or more points of the continuous grinding plant fed.
• Multi-component cement is taken from the discharge of the continuous grinding plant MDB. If the point of entry is relatively remote from the discharge of the grinding plant, a pronounced grinding of the Portland cement takes place together with the granulated blastfurnace slag. By contrast, if the point of entry is relatively close to the discharge, only an insignificant retranslation of the Portland cement takes place here.
• an existing blastfurnace grinding plant with a correspondingly designed dynamic classifier can advantageously be used for the production of multicomponent cements.
• the basic idea of the invention is that, while the heavier grindable blastfurnace component is being ground in a blast furnace sand mill, for example, finished standardized Portland cement of a selected strength class is introduced into the circuit in front of the sifter. The Portland cement is deposited predominantly with the finished multicomponent cement to form a recipe. Depending on the target fineness of the multicomponent cement to be produced, a partial and doped refinement of the Portland cement is thus realized in the joint final grinding.
• the method according to the invention achieves a number of advantages.
• the particle size distributions of the components in multicomponent cements can be influenced in a targeted manner by introducing Portland cements of different finely ground proportions into the grinding stock stream of a granulated blast furnace slag grinding plant.
• the component Portland cement is nachzerkleinert energetically advantageous in the for a fine comminution gatted much better blast furnace plant compared to a cement grinding plant, which is usually used for a multi-component grinding.
• the degree of refinement of the Portland cement and the particle size distribution of the components in the multicomponent cement are determined by varied finenesses of the Portland cement and selected target finenesses of the resulting multicomponent cement.
• the production of multicomponent cements can be planned within wide limits.
• the production of standardized and non-standardized binders is possible on call.
• the setting parameters of the plant for the production of multicomponent cements or non-standard multicomponent binders can be predicted with the aid of a flow-schema-based simulation.
• the driving style of a grinding plant by means of flowchart simulation on the basis of modeled predictive calculation models sufficiently accurate, so that no further adjustments to the existing grinding plant and no further sampling and analysis effort are required to obtain the required statements.
• the invention represents an optimal alternative to the previously used technologies of common grinding of the components on the one hand and their separate grinding with subsequent mixing on the other.
• the invention makes it possible to selectively influence the particle size distributions of the components, which is not possible with the previous technologies.
• the point of entry of the Portland cement in the longitudinal direction of the continuous grinding plant is selectable.
• a tube screw conveyor it is conceivable to provide it with a series of axially spaced closable outlet openings.
• By appropriate choice of the outlet opening can thus change the entry point in the continuous grinding plant for the Portland cement.
• the discharge of the circulating grinding plant MB can be carried out at least partially pneumatically and promoted to the dynamic classifier.
• the mill exhaust dust can also be fed to the entry of the dynamic classifier.
• the mill exhaust dust can be returned to the grinding plant, in particular with a tube screw conveyor.
• the mechanically bound water is removed from the moist blastfurnace slag.
• the dryer works in conjunction with a hot gas generator.
• the pneumatic mill discharge is placed in a static separator, from which the coarse material is fed into the conveyor line to the dynamic classifier.
• the exhaust air of the static classifier is fed to an exhaust filter, whereby the filter dust of the exhaust filter is also entered into the dynamic classifier.
• a plant for producing a multicomponent cement provides a circulating grinding plant MB for a mending component B, preferably blast furnace slag.
• a mending component B preferably blast furnace slag.
• the ground material of the grinding plant is fed from the discharge of the entry of a dynamic classifier with adjustable separation section.
• the coarse material is returned to the entry of the grinding unit MB via a return conveyor.
• a reservoir for Portland cement as component A which is connected via a line with the conveyor between the discharge of the grinding system MB and the entry of the dynamic classifier, allows the supply of, for example, standardized Portland cement in the Mahlgutstrom to the dynamic separator of the grinding plant MB.
• the material to be milled for the component B eg granulated slag, is also contained in a reservoir, which is connected to the entry of the grinding plant.
• a continuous grinding plant for the component B may be provided, such as blastfurnace slag.
• the entry of the throughput grinding plant MBD is connected to a reservoir for the component B to be milled.
• From the discharge of the continuous grinding plant MBD for the multi-component cement ago extends in the longitudinal direction of the continuous grinding plant MBD a linear conveyor for a component A in the continuous grinding plant.
• the linear conveyor is connected to a reservoir for component A.
• the linear conveyor has at least one discharge within the continuous grinding plant.
• the linear conveyor may be, for example, a tube screw conveyor having a plurality of spaced outlet openings along its extent.
• an embodiment of the invention provides that the entry of the grinding system MB or Continuous grinding plant MBD is connected to a reservoir for a sulfate carrier.
• the required output data is taken from the recorded reference state (*), s. Table 1, column 2, or the Mahllesskenn- curves of the components, for example according 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.
• FIG. 1 shows a block diagram of a first embodiment of a grinding plant according to the invention.
• FIG. 2 shows a block diagram of a second embodiment of a grinding plant according to the invention.
• FIG. 1 there is shown a ball mill 10 which is particularly designed as a granulated slag granulator, i. with balls of 40-50 mm at the entry and about 17 mm at the discharge; from the entry to the discharge with decreasing diameter.
• Wet blast furnace slag from a reservoir 12 is fed into a riser dryer 16 by an arbiter, not shown, together with a hot gas stream generated in a hot gas generator 14.
• the drying gases in the riser dryer 16 resulting water and regrind laden drying gases consisting of gas and solid are separated by means not shown cyclone and fabric filter from each other.
• the water vapor gets into the environment.
• the solid particles deposited in the cyclone, not shown, and in the fabric filter, not shown, are the dried granulated slag from the riser dryer 16 and are fed to the ball mill 10.
• the comminuted material comminuted in the ball mill 10 leaves the discharge of the mill 10 predominantly by mechanical transport and is guided, for example, via a circulation cupping plant and flow channels (not shown) to a dynamic classifier 18.
• the ball mill 10 is ventilated by cold air intake. This cold air flow achieves a limited pneumatic grinding material discharge at the ball mill discharge.
• This pneumatically discharged regrind is first transferred over a static classifier 20 is guided, wherein the discharged coarse material 22 is fed directly to the conveying paths to the dynamic classifier 18.
• the discharged from the static separator 20 dust-laden cold gas stream is separated in an exhaust filter 24.
• the cleaned exhaust air enters the environment, while the solids content from the filter 24 are also supplied to the dynamic classifier 18. This handling ensures the homogeneity of the composition of the multicomponent cements produced by the system.
• the dynamic classifier 18 is set to a predetermined separation cut. Coarse material of the dynamic classifier or its return passes through a return device 26 to the entry of the ball mill 10.
• Portland cement - standardized or not standardized - is entered from a reservoir 28 in the described cycle before the dynamic classifier 18.
• the Portland cement is classed together with the granulated blastfurnace flour. Depending on the specified nominal fineness of the multicomponent system, as described, a small proportion is returned as a semolina to the ball mill 10 and comminuted.
• the blastfurnace ball mill is optimally finished for this post-shredding.
• the Portland cement grades are reground together with the blastfurnace slag.
• the Portland cement may be present, for example, in the finer points of CEM I 32.5 R, CEM I 42.5 R or CEM I 52.5 R or in special finenesses.
• a sulphate carrier is admixed to the Portland cement, but by the addition of the Portland cement in the grinding of, for example, granulated blastfurnace slag the SO 3 content decreases in the resulting multicomponent cement.
• a reservoir 30 with sulfate carrier is provided, which is also fed to the inlet of the ball mill 10 via an arbiter, not shown, in order to achieve the desired SO 3 content in the finished multicomponent cement.
• FIG. 2 shows a continuous mill 40, having a first chamber 42 and a second chamber 44, each containing grinding balls of a predetermined type for the grinding of granulated blastfurnace slag.
• the mill can also be designed as a single-chamber mill.
• dry granulated slag is fed to the entry of the continuous mill 40, together with a sulfate carrier from a reservoir 48, which serves to optimize the SO 3 content in multi-component cements.
• a tube screw conveyor 50 is inserted into the chamber 44.
• the inlet of the tube screw conveyor 50 is connected to a reservoir Portland cement 52, and the tube screw transports the Portland cement into the second chamber 44.
• the installed pipe screw conveyor 50 has, for example, four longitudinally spaced, closable outlets 54. The number and the closeability of the outlets are freely selectable. If the Portland cement at the end of the tube screw conveyor registered in the chamber 44, a joint grinding of the Portland cement with the blast furnace slag over almost the entire length of the second chamber 44. The closer the exit of the screw conveyor tube for discharging the continuous mill 40 is, the less is a post-grinding , An outlet near the outlet of the mill MBD requires that the Portland cement in the Essentially, only with the blastfoot sand meal is mixed. As already mentioned, finished slag cement leaves via the discharge 56 the continuous mill 40. The exhaust air from the pass mill 40 passes into an exhaust air filter 58, from which the filter dust is also supplied to the inlet of the screw conveyor.

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• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Ceramic Engineering (AREA)
• Materials Engineering (AREA)
• Structural Engineering (AREA)
• Organic Chemistry (AREA)
• Food Science & Technology (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Inorganic Chemistry (AREA)
• Disintegrating Or Milling (AREA)
• Crushing And Grinding (AREA)

Applications Claiming Priority (2)

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• 2007
  • 2007-09-29 DE DE200710046835 patent/DE102007046835B3/de not_active Expired - Fee Related
• 2008
  • 2008-09-23 EP EP08802508A patent/EP2193106A2/de not_active Withdrawn
  • 2008-09-23 BR BRPI0817576 patent/BRPI0817576A2/pt not_active Application Discontinuation
  • 2008-09-23 CA CA 2701331 patent/CA2701331A1/en not_active Abandoned
  • 2008-09-23 AU AU2008306215A patent/AU2008306215A1/en not_active Abandoned
  • 2008-09-23 MX MX2010003508A patent/MX2010003508A/es unknown
  • 2008-09-23 WO PCT/EP2008/008016 patent/WO2009043503A2/de active Application Filing
  • 2008-09-23 US US12/680,121 patent/US20100294170A1/en not_active Abandoned

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