EP2705008A1 - Procédé et installation de production d'un liant hydraulique - Google Patents

Procédé et installation de production d'un liant hydraulique

Info

Publication number
EP2705008A1
EP2705008A1 EP12724087.7A EP12724087A EP2705008A1 EP 2705008 A1 EP2705008 A1 EP 2705008A1 EP 12724087 A EP12724087 A EP 12724087A EP 2705008 A1 EP2705008 A1 EP 2705008A1
Authority
EP
European Patent Office
Prior art keywords
cement clinker
calcium carbonate
grinding
containing product
precipitated calcium
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Withdrawn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
EP12724087.7A
Other languages
German (de)
English (en)
Inventor
Markus Sauer
Viktor Marchuk
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.)
ThyssenKrupp Industrial Solutions AG
Original Assignee
ThyssenKrupp Resource Technologies GmbH
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 ThyssenKrupp Resource Technologies GmbH filed Critical ThyssenKrupp Resource Technologies GmbH
Publication of EP2705008A1 publication Critical patent/EP2705008A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B7/00—Rotary-drum furnaces, i.e. horizontal or slightly inclined
    • F27B7/20—Details, accessories, or equipment peculiar to rotary-drum furnaces
    • F27B7/2016—Arrangements of preheating devices for the charge
    • F27B7/2025—Arrangements of preheating devices for the charge consisting of a single string of cyclones
    • F27B7/2033—Arrangements of preheating devices for the charge consisting of a single string of cyclones with means for precalcining the raw material
    • 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 method and a plant for producing a hydraulic binder.
  • the grinding of the cement clinker is carried out in a ball, vertical or high-bed roller mill, the latter being preferred from an energetic point of view.
  • the invention is therefore based on the object to produce a fast hardening binder with low water requirement, which is based on a solely in the good bed, so without downstream ball mill, ground cement clinker and compared to pure Gutbettwalzenmühle grind through a much lower
  • the inventive plant for producing a hydraulic binder has a first process strand for the production of cement clinker and an adjoining second process strand with a cement clinker grinding plant for grinding the cement clinker, the cement clinker grinding plant only a grinding unit in the form of at least one Goodbettwalzenmühle with two pressed against each other, between them comprises a grinding gap having grinding rolls. Also provided is a precipitating aggregate for producing a precipitated calcium carbonate (PCC) product which is in communication with the second process strand before or during or after the bed of material mill for mixing the precipitated calcium carbonate containing product with the cement clinker.
  • PCC precipitated calcium carbonate
  • the precipitated calcium carbonate-containing product is very fine compared to the ground cement clinker and preferably has a specific low surface area particulate structure, preferably BET ⁇ 12 m 2 / g (12 m 2 / g BET specific surface area). These particles increase the packing density and at the same time reduce the specific surface area of the entire cement mixture. By comparison, the use of the widespread BET-specific silica dust of 20-22 m 2 / g leads to a marked increase in the specific surface area of the cement mixture. Thus, the ultrafine particles of the precipitated calcium carbonate-containing product lead to a displacement of the water, which is available for the improvement of the processing or the water requirement to the standard stiffness. The resulting higher packing density also results in an increase in early strength.
  • the fine calcium carbonate-containing particles also chemically affect the interaction between the individual solids of the mixture. On the one hand, this is a possible direct reaction of the calcium carbonate containing particles with the aluminate phase of the Clinker. On the other hand, very fine calcium carbonaceous particles play the role of the reaction nuclei for the rapid formation of CSH phases.
  • the preferred procedure of the method is that preheated in the production of cement clinker cement raw meal, then optionally at least partially precalcined and then finished, while the precipitated calcium carbonate-containing product is prepared by part of the preheated and optionally precalcined cement raw meal before the Firing is discharged from the cement clinker production process and subjected to precipitation to precipitate a Calciumcarbonat successionn product.
  • the precipitation takes place by introducing carbon dioxide into a liquid containing the preheated and possibly at least partially precalcined cement raw meal, which is in particular water.
  • the precipitated calcium carbonate-containing product is preferably prepared with a particle size smaller than 20 ⁇ , in particular in the range of 0.1 to ⁇ .
  • the precipitated calcium carbonate-containing product can also be added as a mixture of calcium carbonate and silicon dioxide, wherein a mass ratio between Si0 2 and CaC0 3 in the range of 1.0 to 0.1 has proved to be advantageous.
  • Pozzolanic Si0 2 particles contribute to the increase in the hardness.
  • the precipitated calcium carbonate-containing product can be added as a powder, as a suspension or in another form, wherein a solids content in the suspension greater than 30 M .-% has proven to be advantageous.
  • the precipitated calcium carbonate-containing product can also be added as a mixture together with grinding additives such as grinding aids or performance enhancers (eg liquefier).
  • grinding additives such as grinding aids or performance enhancers (eg liquefier).
  • performance enhancers eg liquefier
  • the water consumption and the strength of the hydraulic binder can be influenced.
  • a proportion of 2 to 20% of the precipitated calcium carbonate-containing product has proved to be particularly expedient, resulting in a reduction of the water requirement and an increase in the strengths in the entire area.
  • At least one further main component formed by granulated slag or limestone or fly ash or pozzolan or silica fume or burned slate or mixtures of said components can also be added to the cement clinker before or after grinding.
  • the first process line of the plant for the production of the hydraulic binder may comprise in particular the following process steps: a preheater for preheating cement raw meal, optionally a calciner for at least partially precalcining preheated cement raw meal, an oven for burning the cement raw meal into cement clinker and a cooler for cooling the cement clinker ,
  • a bypass line branching off in front of the furnace is provided for withdrawing part of the preheated and optionally at least partially precalcined cement raw meal, the precipitation unit being connected to the bypass line for producing the precipitated calcium carbonate-containing product.
  • FIG. 1 is a schematic representation of a plant for producing a hydraulic binder with a precipitated calcium carbonate-containing product
  • Fig. 2 is a diagram showing the water requirement depending on the calcium carbonate-containing product.
  • the plant shown in Fig. 1 for producing a hydraulic binder with a precipitated calcium carbonate product consists essentially of a preheater 1 for preheating cement raw meal 2, possibly a calciner 3 for calcining the preheated cement raw meal, a furnace 4 for firing the cement raw meal to cement clinker 13 and a cooler 5.
  • the preheater 1 is formed, for example, as a floating gas heat exchanger with a plurality of stages arranged one above the other, through which the exhaust gas of the furnace 4 flows in countercurrent to the cement raw meal 2.
  • a bypass line 6 branches off, to which a precipitation unit 8 for producing the precipitated calcium carbonate-containing product is connected with the interposition of a cooling device 7.
  • the branched, preheated and optionally precalcined cement raw meal T is cooled to temperatures below 850 ° C, in particular to temperatures in a range of 30-80 ° C.
  • a flight flow method is suitable.
  • the resulting heat can either directly or indirectly via a heat exchanger 9 the cement production process, in particular the preheater 1, are returned. Alternatively, the drying of the precipitate is conceivable.
  • water is used as a liquid, so that together with the cement raw meal T forms a lime (calcium hydroxide), is introduced into the carbon dioxide, so that the precipitated calcium carbonate-containing product 11 is formed.
  • lime calcium hydroxide
  • the precipitated product has a particle structure with oval-shaped particles and smooth surface. It is also advantageous if grain fractions or particle sizes or grain bands in the order of magnitude of 0.5 ⁇ m to 20 ⁇ m, preferably 0.5 ⁇ m to 10 ⁇ m, are produced during the precipitation.
  • additional calcium-containing additives or waste materials or else silicon dioxide 10 can also be fed to the precipitation unit 8.
  • the heat contained in the precipitated calcium carbonate-containing product 11 can be recuperated via a heat recuperation stage 12 and used in the cement production process, for example in the preheater 1 or in any required drying or heating of additives.
  • the cooled cement clinker 13 is then ground in a cement clinker grinding plant 14, which comprises only one grinding unit in the form of a Gutbettwalzenmühle 14a with two mutually pressed, between them a Mahlspalt having grinding rollers and cooperates in a conventional manner as Kreislaufmahlstrom with a classifier 14b.
  • the ground cement clinker 13 ' is then added in a suitable mixing and metering device 15, the precipitated calcium carbonate-containing product 11 to form the hydraulic binder 16.
  • At least one further main component 17 formed by granulated slag or limestone or fly ash or pozzolan or silica fume or burned slate or mixtures of said components can be admixed with the cement clinker before or after the grinding. That too Calcium carbonate-containing product 11 can be added in whole or in part before the grinding of the cement clinker.
  • the water requirement of the mixtures was determined according to DIN EN 196 with a Vicat needle device. Strength development was performed on 40x40x160 mm prisms of mortar with the following composition: binder - 1 part; Sand - 3 parts; Water - determined according to the water requirement.
  • the addition of ultrafine calcium carbonate to the ground cement clinker leads to a significant reduction of the water requirement by 1-6%. For example, there is a 3.5% decrease in water demand with a 5% by weight calcium carbonate addition.
  • the 2d strength increases by 26% and the 7d strength by 10% compared to the pure cement.
  • the 28d-strength is at the same level despite different cement content.
  • the addition of the calcium carbonate-containing product significantly increases the early strengths, which can be attributed to the reactivity of the precipitated calcium carbonate.
  • this is a possible direct reaction of the calcium carbonate-containing particles with aluminate-containing phase of the clinker.
  • very fine calcium carbonaceous particles play the role of the reaction nuclei for the rapid formation of CSH phases.
  • Precipitated calcium carbonate-containing product is thus a valuable additive for the optimization of the cement clinker ground only with a high-bed roller mill.
  • the production of fast hardening cements, including CEM I, only with the grinding in a Gutbettwalzenmühlen cycle without downstream ball mill is possible.
  • a reduced water requirement allows the application of a lower water / binder value with all positive for given workability Effects on the hardened concrete properties.
  • Another advantage is the attainability of a particular consistency for high performance concretes using a lesser amount of expensive high performance condenser.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Crushing And Grinding (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Abstract

L'invention concerne un procédé de production d'un liant hydraulique, selon lequel du clinker est produit, puis broyé à l'aide d'au moins un broyeur à cylindres exclusivement dans un lit de particules, au moins 2 % d'un produit contenant du carbonate de calcium précipité étant ajouté avant ou après le broyage du clinker. L'installation selon l'invention destinée à produire un liant hydraulique comporte une première ligne de traitement pour la fabrication de clinker et une deuxième ligne de traitement adjacente à celle-ci présentant au moins une installation de broyage de clinker destinée à broyer le clinker, l'installation de broyage de clinker comprenant seulement une unité de broyage sous la forme d'au moins un broyeur à cylindres à lit de particules doté de deux cylindres broyeurs pressés l'un contre l'autre et comportant une fente de broyage ménagée entre eux. En outre, une unité de précipitation destinée à produire un produit contenant du carbonate de calcium précipité est reliée à la deuxième ligne de traitement en amont ou en aval du ou des broyeurs à cylindres à lit de particules pour le mélange du produit contenant du carbonate de calcium précipité au clinker.
EP12724087.7A 2011-05-05 2012-04-30 Procédé et installation de production d'un liant hydraulique Withdrawn EP2705008A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE201110050134 DE102011050134B3 (de) 2011-05-05 2011-05-05 Verfahren und Anlage zur Herstellung eines hydraulischen Bindemittels
PCT/EP2012/057913 WO2012150213A1 (fr) 2011-05-05 2012-04-30 Procédé et installation de production d'un liant hydraulique

Publications (1)

Publication Number Publication Date
EP2705008A1 true EP2705008A1 (fr) 2014-03-12

Family

ID=46177394

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12724087.7A Withdrawn EP2705008A1 (fr) 2011-05-05 2012-04-30 Procédé et installation de production d'un liant hydraulique

Country Status (3)

Country Link
EP (1) EP2705008A1 (fr)
DE (1) DE102011050134B3 (fr)
WO (1) WO2012150213A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI130090B (en) * 2021-08-02 2023-01-31 Parma Oy Concrete composition

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0780695B2 (ja) * 1990-03-12 1995-08-30 秩父小野田株式会社 水硬性セメント
DE19752243C2 (de) * 1997-11-26 2003-04-10 Paul Loerke Verfahren zum Herstellen von Zement
SE524154C2 (sv) * 2002-11-07 2004-07-06 Procedo Entpr Ets Förfarande för framställning av blandcement med reducerande koldioxidemissioner
WO2006134080A1 (fr) 2005-06-15 2006-12-21 Solvay (Société Anonyme) Utilisation de particules de carbonate de calcium dans la production de materiaux de construction
FR2901268B1 (fr) * 2006-05-17 2008-07-18 Lafarge Sa Beton a faible teneur en ciment
WO2011130482A2 (fr) * 2010-04-15 2011-10-20 Roman Cement, Llc Mélanges de ciment hydraulique et de matières cimentaires supplémentaires à distribution granulométrique serrée, et leurs procédés de fabrication
US8414700B2 (en) * 2010-07-16 2013-04-09 Roman Cement, Llc Narrow PSD hydraulic cement, cement-SCM blends, and methods for making same

Also Published As

Publication number Publication date
WO2012150213A1 (fr) 2012-11-08
DE102011050134B3 (de) 2012-07-26

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