EP0588872A1 - Procede permettant de former des agregats solides tels que des articles formes - Google Patents

Procede permettant de former des agregats solides tels que des articles formes

Info

Publication number
EP0588872A1
EP0588872A1 EP92911888A EP92911888A EP0588872A1 EP 0588872 A1 EP0588872 A1 EP 0588872A1 EP 92911888 A EP92911888 A EP 92911888A EP 92911888 A EP92911888 A EP 92911888A EP 0588872 A1 EP0588872 A1 EP 0588872A1
Authority
EP
European Patent Office
Prior art keywords
aluminosilicate containing
soil
mixture
shaped article
fly ash
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Withdrawn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
EP92911888A
Other languages
German (de)
English (en)
Other versions
EP0588872A4 (fr
Inventor
John Cavill Howlett
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.)
Ferrock Corp Australia Pty Ltd
Original Assignee
Ferrock Corp Australia Pty Ltd
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 Ferrock Corp Australia Pty Ltd filed Critical Ferrock Corp Australia Pty Ltd
Publication of EP0588872A1 publication Critical patent/EP0588872A1/fr
Publication of EP0588872A4 publication Critical patent/EP0588872A4/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Withdrawn legal-status Critical Current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
    • 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
    • C04B28/24—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 alkyl, ammonium or metal silicates; containing silica sols
    • C04B28/26—Silicates of the alkali metals
    • 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

  • This invention relates to a process for the preparation of shaped articles such as construction materials, pavers and the like, in particular to a process that utilises waste and other materials such as fly ash in amounts that may constitute a major proportion of the shaped articles.
  • the invention also relates to a process for the disposal of particulate waste materials such as fly ash whereby these materials are converted into a solid aggregate.
  • a construction 20 material is formed from a mixture of a soil that has been heated in a manner such that the property of the soil to swell with changing levels of moisture is destroyed without melting any of the soil constituents, with iron oxide which is added either before or after heating and 5 into which a solution of sodium silicate is added.
  • the sodium silicate solution may be formed by admixing fly ash and sodium hydroxide. This use is of course indirect as the fly ash is merely used to form sodium silicate.
  • the present invention consists in a process for the preparation of a solid aggregate material comprising: a) preparing a mixture of an aluminosilicate containing non-soil or waste material to contain, iron oxide, an alkali, a water soluble silicate, water and optional additives excluding binders; b) forming the mixture into a cohesive mass; and c) curing the mass whereby a solid aggregate material is formed.
  • this invention consists in a solid aggregate material made by a process according to the present invention.
  • the solid aggregate material may comprise a shaped article.
  • This process requires that the step of forming the mixture into a cohesive mass comprise formation of the mixture into a shaped article.
  • the subsequent curing step will be carried out in a manner such that the shaped article will attain a requisite strength.
  • the solid aggregate may have a minimal compressive strength in which case the curing step will generally comprise air drying until a solid aggregate is formed.
  • the curing step will generally comprise air drying until a solid aggregate is formed.
  • Such a process is particularly useful for the disposal of particulate aluminosilicate containing waste materials.
  • Australian patent 535130 has as an essential feature the use of a particularly prepared soil which is not essential in the present invention, and there is no suggestion or teaching to include fly ash per se or more particularly a water soluble silicate and fly ash, it is evident that the present invention represents a fundamentally different process.
  • the present inventor believes that, without being bound by theory, in the process of the present invention an iron aluminosilicate crystal structure is formed which imparts relatively high strength to the resultant shaped articles.
  • the aluminosilicate containing non-soil or waste material may comprise a variety of materials including fly ash, metropolitan waste ash, sewerage ash, other flue ashes, coal wash tailings, mineral tailings, scoria, obsidian, other pozzolanic materials and neutral to slightly acidic slags.
  • the material will be in particulate form, usually relatively fine particles.
  • an amount of up to about 95% by weight of the aluminosilicate material may be included in the mixture thereby providing for the possibility of both disposing of and utilising substantial amounts of fly ash.
  • the amount of iron oxide used may be as low as about 1% by weight with respect to the aluminosilicate containing material. At levels up to about 7% compressive strength increases but above that level compressive strength remains substantially constant.
  • the aluminosilicate containing material may comprise a material such as a flue dust high in iron oxide without being detrimental to the strength of shaped articles formed from such materials.
  • aluminosilicate materials may inherently contain sufficient iron oxide to circumvent the need to add iron oxide when preparing the mixture.
  • An example of such materials are particular ashes.
  • a similar minimum level of water soluble silicate may be used as to iron oxide. In this case levels above about 10% do not result in further increases in compressive strength.
  • the amount of alkali used is not critical in that levels as low as 0.9% by weight with respect to the aluminosilicate containing material have yielded shaped articles of acceptable compressive strength.
  • the alkali will be a strong alkali such as sodium or potassium hydroxide.
  • silicate used relative to the aluminosilicate containing material is an important factor in determining compressive strength.
  • a minimum of at least about 5% by weight of silicate will generally be required.
  • the amount of water incorporated in the mixture will depend upon the manner in which the shaped article is to be formed. An amount of water equivalent to at least about 10% by weight of the aluminosilicate containing material will usually be sufficient in forming the majority of shaped articles.
  • a variety of additives, excluding binders, may be included in the mixture in amounts up to about three times the weight of aluminosilicate containing material. These additives including appropriately graded gravel, sand, pigments and calcined soils. Usually such additives will be included to produce a shaped article having a particularly desired texture, colour or appearance.
  • the mixture of the aluminosilicate containing material, iron oxide, alkali, water and optional additives may be formed into a variety of shaped articles by compaction, moulding, extruding or slip forming.
  • the method of formation will be largely determined by the composition of the mixture and the nature of the finished shaped article.
  • a variety of shaped articles may be formed using this invention including tiles, pavers and construction materials such as bricks, blocks and the like.
  • the shaped article may be allowed to cure in ambient air at a temperature of about 20-40 C. Under these conditions, curing will normally be completed in about 7 days.
  • the energy requirements of the invention are quite low, thereby contributing to the relatively low cost of these shaped articles. It has, however, been found that it is possible to substantially accelerate the curing time by increasing the curing temperature, for example, by curing at 100°C in a confined environment.
  • the present invention comprises shaped articles in the form of bricks which comply with Australian Standard AS1226-1984 for clay bricks or AS2733-1984 for concrete masonry units.

Landscapes

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

Abstract

Cette invention concerne un procédé à l'aide duquel on peut préparer des matériaux d'agrégats solides. Dans ce procédé, on utilise un silicate d'alumine contenant des déchets ou des matières ne provenant pas du sol qui sont mélangés à de l'oxyde de fer, un alcali, un silicate soluble dans l'eau et de l'eau pour produire un mélange auquel on donne ensuite une forme de masse cohésive qu'on laisse durcir jusqu'à ce que le matériau d'agrégat solide soit formé. Ce procédé est utile pour produire des matériaux résistant faiblement à la compression tels que des remblais et des matériaux résistant fortement à la compression tels que des briques. Etant donné que les matériaux appropriés contenant du silicate d'alumine renferment des cendres volantes, ce procédé utilise un moyen permettant de transformer d'importantes quantités de ce type de matériaux sous forme utile.
EP19920911888 1991-06-12 1992-06-12 Procede permettant de former des agregats solides tels que des articles formes. Withdrawn EP0588872A4 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
AUPK664291 1991-06-12
AU6642/91 1991-06-12
PCT/AU1992/000283 WO1992022514A1 (fr) 1991-06-12 1992-06-12 Procede permettant de former des agregats solides tels que des articles formes

Publications (2)

Publication Number Publication Date
EP0588872A1 true EP0588872A1 (fr) 1994-03-30
EP0588872A4 EP0588872A4 (fr) 1994-11-23

Family

ID=3775466

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19920911888 Withdrawn EP0588872A4 (fr) 1991-06-12 1992-06-12 Procede permettant de former des agregats solides tels que des articles formes.

Country Status (2)

Country Link
EP (1) EP0588872A4 (fr)
WO (1) WO1992022514A1 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE69333774D1 (de) * 1992-12-11 2005-04-21 Maroun Rahme Michelle Verfahren zum herstellen von geformten gegenständen
JPH0717760A (ja) * 1993-06-23 1995-01-20 Ken Gensai 高強度セラミック体及びその製造方法
AU4922696A (en) * 1995-02-17 1996-09-04 By-Products Development Co. Fly ash cementitious material
ES2162716B1 (es) * 1995-07-19 2003-03-01 Pous Joan Maria Neira Procedimiento de fabricacion y piezas resultantes para la construccion.
US5679248A (en) * 1995-12-19 1997-10-21 Kimberly-Clark Worldwide, Inc. Coextruded blocks and applications therefor
AU2017381405B2 (en) * 2016-12-23 2022-10-06 Nu-Rock Corporation S.A.R.L. Process and apparatus for producing a shaped article
CN109437849A (zh) * 2018-12-10 2019-03-08 上海应用技术大学 一种用生活垃圾焚烧飞灰改性制饰面砖的制备方法
CN110818378A (zh) * 2019-11-13 2020-02-21 安徽省东润新材料科技有限公司 一种铁尾砂水硬性路基填筑材料及制备方法

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2106810A5 (en) * 1970-09-24 1972-05-05 France Etat Silicate modified mix for road surfaces - gives improved short term strength
FR2320266A1 (fr) * 1975-08-06 1977-03-04 Quienot Jean Procede de solidification de dechets de nature et origine diverses

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU715539A1 (ru) * 1978-01-05 1980-02-15 Магнитогорский горно-металлургический институт им.Г.И.Носова Бетонна смесь
ZA911688B (en) * 1990-03-22 1991-12-24 Csir Binder

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2106810A5 (en) * 1970-09-24 1972-05-05 France Etat Silicate modified mix for road surfaces - gives improved short term strength
FR2320266A1 (fr) * 1975-08-06 1977-03-04 Quienot Jean Procede de solidification de dechets de nature et origine diverses

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
CHEMICAL ABSTRACTS, vol. 117, no. 2, 13 July 1992, Columbus, Ohio, US; abstract no. 13473r, D. GLADSTONE ET AL 'Binders comprising Class F fly ash and alkali metal compound, and manufacture of artifacts with these binders' page 353 ; & ZA-A-9 101 688 24 December 1991 *
CHEMICAL ABSTRACTS, vol. 93, no. 2, 14 July 1980, Columbus, Ohio, US; abstract no. 12394q, S.A. KRIVOROTOV ET AL 'Concrete mixture' page 270 ; & SU-A-715 539 (MAGNITORGORSK MINING-METALLURICAL INSTITUTE) 15 February 1980 *
CHEMICAL ABSTRACTS, vol. 98, no. 12, 21 March 1983, Columbus, Ohio, US; abstract no. 94572m, Z. LAZNICKA 'Pressing noncompact moist silicate mixtures into closed forms by stamping' page 304 ; & CS-A-194 921 30 June 1982 *
See also references of WO9222514A1 *

Also Published As

Publication number Publication date
EP0588872A4 (fr) 1994-11-23
WO1992022514A1 (fr) 1992-12-23

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