EP1087917A1 - Procede pour ameliorer l'aptitude au broyage d'additifs pour ciment - Google Patents

Procede pour ameliorer l'aptitude au broyage d'additifs pour ciment

Info

Publication number
EP1087917A1
EP1087917A1 EP00918559A EP00918559A EP1087917A1 EP 1087917 A1 EP1087917 A1 EP 1087917A1 EP 00918559 A EP00918559 A EP 00918559A EP 00918559 A EP00918559 A EP 00918559A EP 1087917 A1 EP1087917 A1 EP 1087917A1
Authority
EP
European Patent Office
Prior art keywords
treatment
temperature
grinding
carried out
cement
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Withdrawn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
EP00918559A
Other languages
German (de)
English (en)
Inventor
Andreas Gössnitzer
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.)
Holcim Ltd
Original Assignee
Holderbank Financiere Glarus AG
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 Holderbank Financiere Glarus AG filed Critical Holderbank Financiere Glarus AG
Publication of EP1087917A1 publication Critical patent/EP1087917A1/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Withdrawn legal-status Critical Current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
    • C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
    • C04B20/02—Treatment
    • C04B20/04—Heat treatment
    • 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 for improving the grindability and for adjusting the hydraulic properties of cement additives, in particular slags, fly ash or pozzolans.
  • Slag cements in particular blast furnace slag cement or metallurgical cement, are obtained from granulated slags by grinding and are generally used as additives for cement mixtures. It is known to improve the grinding properties during grinding by chemical additives and in particular by so-called grinding aids, which, however, subsequently result in foreign substances in the ground material. It is also known to influence the hydraulic properties and in particular the hardening behavior and the compressive strength that can be achieved at certain times by chemical additives which are added either to the cement or during the production of concrete.
  • the method according to the invention essentially consists in that the cement additives are subjected to a temperature treatment between 250 ° C. and 1000 ° C. before the grinding process.
  • a temperature treatment between 250 ° C. and 1000 ° C. before the grinding process.
  • granulated blast furnace slag in particular shows a significant improvement in the fracture mechanical properties with such a temperature treatment.
  • the modification lies essentially in the range between the so-called glass relaxation temperature and the crystallization temperature, whereby it has been shown that treatment at about 500 ° C. and over a period of about 1 hour leads to a reduction in the grinding energy to be used by about 20%.
  • the process according to the invention is advantageously carried out in such a way that the temperature treatment is carried out between 300 ° and 900 ° C., in particular between 300 and 700 ° C., the grinding energies to be reduced to about half and within the preferred range within this temperature range In the temperature range, an increase in the compressive strength of almost 20% could be achieved after 28 days if such heat-treated blast furnace slag was mixed with Portland cement in a ratio of 1: 1 after or during the grinding process.
  • the improvement in the grindability of the treated component also leads to an improvement in the grindability of a mixture of Portland cement clinker and treated blast furnace slag granules, so that even when jointly ground with Portland cement clinker A reduction in the grinding energy to be used or, with the same grinding energy being used, a higher grinding fineness could be observed.
  • the process according to the invention is carried out in such a way that the temperature treatment is carried out over a period of between 15 'and 3 h, preferably 45' to 2 h.
  • the temperatures required for the heat treatment are generally available as waste heat in the area of the blast furnace, particularly when using blast furnace slags.
  • the treatment time can be chosen shorter at higher treatment temperatures.
  • the residual heat from the regenerator of a blast furnace can be used.
  • the temperature treatment itself can be carried out at various points, with the advantage that the heat treatment is carried out immediately after the granulation with the residual heat of the granulated particles by delayed cooling, with the targeted influencing of the slag quality or the reduction of the grinding work can be achieved by simply adapting a standard granulation or pelletizing process and in particular by regulating the residence time and the temperature control during dry granulation. Blast furnace slag can also be improved afterwards and placed in drying plants for thermal aftertreatment. Finally, separate treatment units can be arranged in front of a slag mill, for example using the clinker cooler waste heat at the same time, alternatively blast furnace slag in the area of a cement rotary kiln clinker cooler can be introduced into a temperature window suitable for the treatment. Finally, the grinding temperature can be raised when grinding blast furnace slag.
  • the cement additives can be cooled in air in a particularly simple manner after the temperature treatment and before the grinding process, the treatment of blast furnace slags below the mellilite crystallization temperature of approximately 850 ° C. preferably being carried out.
  • the heat treatment is carried out between 250 ° C. and the nucleation temperature of approximately 700 ° C., in particular at approximately 500 ° C.
  • FIG. 1 shows the development of the compressive strength after the temperature treatment
  • FIG. 2 shows the curve of the bending tensile strength for different treatment temperatures
  • FIG. 3 shows the decrease in the required grinding energy for different treatment temperatures.
  • thermoanalytical measurement of the nucleation and crystallization temperatures of the predominantly occurring Mellilith phases as well as determinations of the Blaine grinding fineness by laser diffraction or sieve analysis and the hydraulic activity were carried out ⁇ -Norm B 3310 carried out with mortar prisms with 50% slag, WC value 0.6.
  • the control examinations have shown that the strength development after nucleation is negatively influenced, this negative strength development after nucleation has not yet shown any change in the glass content in the control diffractometer measurements.
  • the investigations were carried out in 100 ° steps for the treatment temperatures, the results being illustrated in FIG. 1. Fig.
  • FIG. 1 shows the course of the compressive strength for different treatment temperatures, a ratio of slag to cement of 50:50 being chosen. From Fig. 1 it can be seen that the strength development and in particular the improvement in the 28-day strength over a temperature range of 400 to 600 ° is clear. The measuring point at 900 ° C. in the illustration in FIG. 1 cannot, however, be addressed as representative, since in this test the constant fineness of 4500 cm 2 / g that was maintained in the other tests could no longer be maintained due to the significantly improved grindability. The greatly improved grindability in this case has resulted in a fineness of 6700 cm 2 / g.
  • the blast furnace slags were processed in a chamber furnace, with treatment temperatures of 1 h each being selected at the temperatures shown in FIG. 1. At the end of the treatment period, the slags were removed from the furnace and cooled in air.
  • the blast furnace slag treated in this way is ground in a ball mill, the grinding progress being determined in each case by measuring the Blaine fineness.
  • the development of the compressive strength shown in Fig. 1 shows that up to a temperature range of about 500 ° C there is a significant increase in the compressive strength.
  • the maximum compressive strength after 28 days is reached at higher temperatures than the maxima for early strength.
  • the temperature treatment thus leads to a differentiation of the strength values at certain points in time, as a result of which the hydraulic system as a whole can be set within wide limits.
  • the measuring point at 900 ° C. in FIG. 1 is not to be regarded as representative, since grinding was carried out to a much greater degree of fineness.
  • the bending tensile strengths could also be significantly influenced by the temperature treatment.
  • 2 shows the curve of the bending tensile strength for various treatment temperatures, again for a slag-cement ratio of 50:50, the above explanations relating to the fineness of the grind again apply to the measuring point at 900.degree.
  • a slight decrease in the bending tensile strength up to the crystallization temperature has been observed, the bending tensile strengths only decreasing significantly after the crystallization temperature has been exceeded.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Processing Of Solid Wastes (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Abstract

L'invention concerne un procédé pour améliorer l'aptitude au broyage et ajuster les propriétés hydrauliques d'additifs de broyage pour ciment, notamment de scories, de cendres volantes ou de pouzzolanes. Ce procédé consiste à soumettre les additifs de broyage à un traitement à des températures comprises entre 250 °C et 1000 °C, avant le broyage.
EP00918559A 1999-04-15 2000-04-14 Procede pour ameliorer l'aptitude au broyage d'additifs pour ciment Withdrawn EP1087917A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
AT25099 1999-04-15
AT25099 1999-04-15
PCT/AT2000/000089 WO2000063133A1 (fr) 1999-04-15 2000-04-14 Procede pour ameliorer l'aptitude au broyage d'additifs pour ciment

Publications (1)

Publication Number Publication Date
EP1087917A1 true EP1087917A1 (fr) 2001-04-04

Family

ID=3485554

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00918559A Withdrawn EP1087917A1 (fr) 1999-04-15 2000-04-14 Procede pour ameliorer l'aptitude au broyage d'additifs pour ciment

Country Status (15)

Country Link
EP (1) EP1087917A1 (fr)
JP (1) JP2002542140A (fr)
KR (1) KR20010052838A (fr)
CN (1) CN1300270A (fr)
AU (1) AU3945200A (fr)
BG (1) BG105095A (fr)
BR (1) BR0006046A (fr)
CA (1) CA2333415A1 (fr)
CZ (1) CZ200199A3 (fr)
HU (1) HUP0103322A3 (fr)
ID (1) ID27021A (fr)
MA (1) MA25435A1 (fr)
SK (1) SK19162000A3 (fr)
WO (1) WO2000063133A1 (fr)
ZA (1) ZA200006775B (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5727168B2 (ja) * 2010-07-26 2015-06-03 株式会社太平洋コンサルタント 高炉セメントに起因する水素ガスの低減方法
JP6195460B2 (ja) * 2013-03-26 2017-09-13 デンカ株式会社 コンクリート用ブリーディング防止剤の製造方法及びそのコンクリート用ブリーディング防止剤を配合したセメント組成物の製造方法

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1985526A (en) * 1933-08-11 1934-12-25 Dicalite Company Heat treatment of diatomaceous earth
JPH0784337B2 (ja) * 1988-09-30 1995-09-13 三菱重工業株式会社 フライアツシユの処理方法
SU1729585A1 (ru) * 1990-05-10 1992-04-30 Казахский политехнический институт им.В.И.Ленина Способ измельчени высокоабразивных металлургических шлаков
NO305896B1 (no) * 1996-04-17 1999-08-16 Elkem Materials Fremgangsmåte ved behandling av silikainneholdende materiale

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0063133A1 *

Also Published As

Publication number Publication date
HUP0103322A3 (en) 2002-11-28
SK19162000A3 (sk) 2001-09-11
CN1300270A (zh) 2001-06-20
ID27021A (id) 2001-02-22
BG105095A (en) 2001-07-31
WO2000063133A1 (fr) 2000-10-26
ZA200006775B (en) 2002-02-20
MA25435A1 (fr) 2002-07-01
CZ200199A3 (cs) 2002-03-13
KR20010052838A (ko) 2001-06-25
JP2002542140A (ja) 2002-12-10
CA2333415A1 (fr) 2000-10-26
AU3945200A (en) 2000-11-02
BR0006046A (pt) 2001-03-13
HUP0103322A2 (hu) 2001-12-28

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