WO2001020048A1 - Modification a temperature elevee d'un laitier d'acierage pour produire un materiau de construction - Google Patents

Modification a temperature elevee d'un laitier d'acierage pour produire un materiau de construction Download PDF

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Publication number
WO2001020048A1
WO2001020048A1 PCT/CA2000/001038 CA0001038W WO0120048A1 WO 2001020048 A1 WO2001020048 A1 WO 2001020048A1 CA 0001038 W CA0001038 W CA 0001038W WO 0120048 A1 WO0120048 A1 WO 0120048A1
Authority
WO
WIPO (PCT)
Prior art keywords
slag
steelmaking
steelmaking slag
fayalite
free lime
Prior art date
Application number
PCT/CA2000/001038
Other languages
English (en)
Inventor
Wei-Kao Lu
Brian Reeves
Original Assignee
Mcmaster University
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 Mcmaster University filed Critical Mcmaster University
Priority to AU69762/00A priority Critical patent/AU6976200A/en
Publication of WO2001020048A1 publication Critical patent/WO2001020048A1/fr

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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
    • C04B5/00—Treatment of  metallurgical  slag ; Artificial stone from molten  metallurgical  slag 
    • C04B5/06—Ingredients, other than water, added to the molten slag or to the granulating medium or before remelting; Treatment with gases or gas generating compounds, e.g. to obtain porous slag
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28—Manufacture of steel in the converter
    • C21C5/36—Processes yielding slags of special composition
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
    • C22B7/04—Working-up slag
    • 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
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

Definitions

  • This application relates to the treatment of steelmaking slag to produce a product suitable for use as construction material.
  • Steelmaking slag a by-product of steel production, can be used for a variety of high quality construction materials. For example, it as been used as a premium aggregate in road surfacing, specifically as a component of asphalt concrete. Its high strength and excellent skidding resistance make it a particularly suitable aggregate for this high-demand application. However, in-service hydration of excessive "free" or
  • oxidic material is mixed with molten steelmaking slag containing free lime to modify slag chemistry and mineralogy to substantially eliminate the free lime and make the final product a volumetrically stable construction material.
  • the nature of the oxide addition depends on the initial composition of the steelmaking slag and the desired application of the final product.
  • the oxidic material may be added before, during or after tapping the slag from a steelmaking vessel.
  • Fayalite slag with which no external heat source may be necessary.
  • Fayalite slag consists mainly of iron silicate and is a waste product from the smelting of non-ferrous metals such as nickel and copper.
  • the steel and construction industries are at odds over lime requirements of the steelmaking slag. Steelmakers require a high lime content in the slag for effective impurity removal, while users of the byproduct in the construction industry demand a low effective content of lime to control volumetric instability of their fabrications.
  • the source of the "free" lime in the slag is twofold: (a) undissolved lime flux, and/or
  • fayalite slag a by-product of the smelting of non-ferrous products, reduces the amount of "free" lime in the modified slag.
  • fayalite slag is composed primarily of silica and iron oxide, it is closest in composition to the "early" slag of oxygen steelmaking process which, based on fundamental scientific principles and previous research, is the best additive to eliminate the undissolved free lime, i.e. (a) above.
  • the silica of the fayalite slag is an acid slag component, which lowers the tendency for formation of precipitated free lime, i.e.
  • fayalite slag can be made depending on the desired properties of the final product.
  • Additional heat, if any, that may be required to incorporate these additions can be supplied by external means, such as electrical heating.
  • the present invention can be used immediately in steel mills to create volumetrically stable construction material, such as aggregates.
  • Modified slag of desired chemical composition and volumetric stability in accordance with the invention will be the base for the development of new high-performance cement in the near future.
  • fayalite slag when used as the oxidic material reduces the liquidus temperature of the melt, which makes extra superheat available for dissolution and incorporation of free lime.
  • This method is more advantageous than traditional moisture aging and steam aging to control volumetric instability as these methods are likely to produce fines in excess for use as aggregate.
  • Fig. 1(a) shows the linear expansion results of control slag during a trial, with coarse gradation.
  • Fig. 1(b) shows linear expansion results with fayalite-modified slag in the trial, with coarse gradation,
  • Fig. 2(a) shows linear expansion results of control slag in the trial, with coarse plus fine gradation
  • Fig. 2(b) shows linear expansion results with fayalite- modified slag in the trial, with coarse plus fine gradation
  • Fig. 3 shows linear expansion results of control and fayalite- modified slag in another trial, with coarse gradation.
  • control slag a reference SS sample
  • the vessel was tipped to allow personnel to
  • the vessel was tipped onto its other side and SS was poured
  • pots were moved to an isolated region of the slag yard, where the slag
  • gradation of aggregates ranges from about - 16mm to about +4.75mm
  • volumetric stability of aggregates is the ASTM D4785-88 Standard Test
  • Such methods include injection technologies, vortex ring mixing,
  • Example 1 inhomogeneous linear expansion resulted
  • the fayalite slag was added within the steelmaking slag.
  • the fayalite slag was
  • SS may contain three of the four
  • the present invention is capable of producing a new series of
  • This cement product is essentially alkali-free, very
  • This modified slag can be used either as a cement on its own
  • cementitious materials such as PC, amo ⁇ hous blast furnace slag, etc.
  • the components of the blended slag cement can be combined

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Ceramic Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Metallurgy (AREA)
  • Structural Engineering (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Abstract

L'invention concerne un procédé servant à traiter un laitier d'aciérage fondu contenant de la chaux libre au moyen d'une matière oxydique afin d'éliminer la chaux libre non dissoute, d'où l'obtention d'un produit amélioré.
PCT/CA2000/001038 1999-09-13 2000-09-12 Modification a temperature elevee d'un laitier d'acierage pour produire un materiau de construction WO2001020048A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU69762/00A AU6976200A (en) 1999-09-13 2000-09-12 High temperature modification of steelmaking slag to provide construction material

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US15322999P 1999-09-13 1999-09-13
US60/153,229 1999-09-13

Publications (1)

Publication Number Publication Date
WO2001020048A1 true WO2001020048A1 (fr) 2001-03-22

Family

ID=22546309

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CA2000/001038 WO2001020048A1 (fr) 1999-09-13 2000-09-12 Modification a temperature elevee d'un laitier d'acierage pour produire un materiau de construction

Country Status (2)

Country Link
AU (1) AU6976200A (fr)
WO (1) WO2001020048A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013021132A1 (fr) * 2011-08-08 2013-02-14 Eiffage Travaux Publics Procédé de sélection de laitiers d'aciérie de conversion
JP2018025461A (ja) * 2016-08-10 2018-02-15 Ｊｆｅスチール株式会社 製鋼スラグの水浸膨張性判定方法およびスラグ路盤材の製造方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4066471A (en) * 1974-06-24 1978-01-03 The Associated Portland Cement Manufacturers Limited Constructional cement
JPS5560046A (en) * 1978-10-27 1980-05-06 Nippon Steel Corp Inorganic binder
JPS57143418A (en) * 1981-02-28 1982-09-04 Sumitomo Metal Ind Ltd Modification method for converter slag
EP0716153A1 (fr) * 1994-12-08 1996-06-12 Daido Tokushuko Kabushiki Kaisha Procédé et four pour l'élimination des déchets sidérurgiques et méthode pour le fonctionnement d'un tel four

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4066471A (en) * 1974-06-24 1978-01-03 The Associated Portland Cement Manufacturers Limited Constructional cement
JPS5560046A (en) * 1978-10-27 1980-05-06 Nippon Steel Corp Inorganic binder
JPS57143418A (en) * 1981-02-28 1982-09-04 Sumitomo Metal Ind Ltd Modification method for converter slag
EP0716153A1 (fr) * 1994-12-08 1996-06-12 Daido Tokushuko Kabushiki Kaisha Procédé et four pour l'élimination des déchets sidérurgiques et méthode pour le fonctionnement d'un tel four

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Week 198024, Derwent World Patents Index; AN 1980-42540C, XP002153996, "Converter slag as weather-resistant inorganic binder" *
PATENT ABSTRACTS OF JAPAN vol. 006, no. 244 (C - 138) 2 December 1982 (1982-12-02) *
UWE HERWIG ET AL: "UNTERSUCHUNGEN VON GEFUGEPHASEN UNBEHANDELTER UND SIO2- NACHBEHANDELTER TBM-SCHLACKEN", STAHL UND EISEN,DE,VERLAG STAHLEISEN GMBH. DUSSELDORF, vol. 115, no. 11, 13 November 1995 (1995-11-13), pages 57 - 62, XP000552167, ISSN: 0340-4803 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013021132A1 (fr) * 2011-08-08 2013-02-14 Eiffage Travaux Publics Procédé de sélection de laitiers d'aciérie de conversion
FR2978968A1 (fr) * 2011-08-08 2013-02-15 Eiffage Travaux Publics Procede de selection de laitiers d'acierie de conversion
JP2018025461A (ja) * 2016-08-10 2018-02-15 Ｊｆｅスチール株式会社 製鋼スラグの水浸膨張性判定方法およびスラグ路盤材の製造方法

Also Published As

Publication number Publication date
AU6976200A (en) 2001-04-17

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