[go: up one dir, main page]

EP0682717A1 - Composite anti-moussage pour laitier - Google Patents

Composite anti-moussage pour laitier

Info

Publication number
EP0682717A1
EP0682717A1 EP94906093A EP94906093A EP0682717A1 EP 0682717 A1 EP0682717 A1 EP 0682717A1 EP 94906093 A EP94906093 A EP 94906093A EP 94906093 A EP94906093 A EP 94906093A EP 0682717 A1 EP0682717 A1 EP 0682717A1
Authority
EP
European Patent Office
Prior art keywords
composite
slag
range
defoaming
slag defoaming
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Withdrawn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
EP94906093A
Other languages
German (de)
English (en)
Other versions
EP0682717A4 (fr
Inventor
Milena Maric
Eric Pye
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.)
LAPORTE GROUP AUSTRALIA Ltd
Original Assignee
LAPORTE GROUP AUSTRALIA 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 LAPORTE GROUP AUSTRALIA Ltd filed Critical LAPORTE GROUP AUSTRALIA Ltd
Publication of EP0682717A1 publication Critical patent/EP0682717A1/fr
Publication of EP0682717A4 publication Critical patent/EP0682717A4/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • 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
    • 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
    • C21C2005/366—Foam slags
    • 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
    • C21C2300/00—Process aspects
    • C21C2300/04—Avoiding foam formation

Definitions

  • This invention relates to a slag defoaming composite for example, for use in steel manufacture, which may preferably be in briquette or pellet form.
  • the invention is not restricted to steel manufacture and may be suitable in a number of applications where the defoaming of slag or the reduction of oxides to the metallic state is required.
  • iron from a blast furnace is converted to steel by placing the iron in a basic oxygen furnace.
  • the quantity of iron can vary. Typically, it is about 200 tonnes.
  • Oxygen is blown into the iron by an oxygen lance and the removal of impurities such as carbon, silicon, manganese, etc., converts the iron to steel.
  • impurities such as carbon, silicon, manganese, etc.
  • the present invention seeks to ameliorate the abovementioned disadvantages and provide an efficient and rapid defoaming agent.
  • the present invention provides a slag defoaming composite, comprising: a carbon source; a source of exothermic material, such as aluminium; a dense insert granular material, such as calcium alumina silicate; and a binder, optionally provided; characterised in that, said composite is selected to have a density sufficient to penetrate the slag layer during processing.
  • said composite is manufactured in the form of briquettes pellets, and/or the like.
  • said slag defoaming composite is substantially non-combustible.
  • the density of said composite is selected to be in the range of 1.0 to 2.6 g/cc.
  • the slag defoaming composite comprises: a carbon source which yields a final carbon content cf the composite in the range of 3 to 50% w/w; a source of aluminium which yields a final aluminium content of the composite within the range of 5 to 60% w/w; a calcium alumino silicate or a similar dense inert granular material within the range of 10 to 50% w/w; and a binder within the range of 0 to 20% w/w.
  • said binder is sodium silicate or similar silicate derivatives, be they organic or inorganic, or clay, lime, or the like.
  • the composite further comprises a lubricant material.
  • said lubricant material is a stearate, such as calcium stearate.
  • said lubricant material is provided within the range of 0 to 2% w/w.
  • said composite further comprises a slag fluidiser.
  • said slag fluidiser is provided in the range of 0 to 30% w/w.
  • the composite further comprises: cellulose based raw material; and flame retardent.
  • said cellulose based raw material is provided in the range of 3 to 30% w/w.
  • typical ingredients include fine granular premelted calcium alumino silicate, fine powder alumina/aluminium, a silica/carbon fine powder admixture, sodium silicate binder and calcium stearate lubricant.
  • the ingredients are mixed together, and then compressed, ideally to a briquette form. Details of the ingredients are as follows, with a suitable composition range for the slag defoaming composite being listed in Example 1, whilst Example 2 provides an example of a typical specific composition.
  • the calcium alumino silicate, or like material has a very important role in the manufacturing of the briquette. It is a non-absorbent/inert material which coarsens the mix and thus adjusts the particle size distribution which allows for the briquetting of the mixture.
  • the binder material is important to bind the various components together.
  • a silicate such as sodium silicate or other similar silicate may be used, or alternatively, materials such as clay or lime, which have a binding effect may be used.
  • a specialised binder material may not need to be added. That is, the other components of the composite may have a binding effect on the ingredients of the composite, such that a specialised binder material is unnecessary.
  • slag fluidiser cellulose based raw materials and flame retardents may also be included.
  • the composite may contain carbon in the range of 3 to 50% w/w. s ag fluidiser in the range of 0 to 30% w/w, and cellulose based raw materials, such as wood chips in the range of 3 to 30%.
  • flame retardent is added to prevent auto combustion in the hopper above the BOF.
  • a preferred method of forming the briquette is to place the low moisture mixture in a hydraulic press and then to compress it to a pressure in excess of 20 tonnes per square inch to form a hard briquette with compression strength above 1000 kPa.
  • a typical size for cylindrically shaped briquettes may be in the range of 65-75 mm in diameter and a 35-50mm in height.
  • the typical density for the briquette in Example 2 would be in the vicinity of 2.4 g/cc; however densities in the range of 1.0 to 2.6 are quite acceptable.
  • the density can generally be adjusted by varying the quantity of the dense inert granular material, eg., calcium alumino silicate present, the content of cellulose based-material or other variations in composition or processing.
  • the briquettes are manufactured with different densities to suit different needs. For example, for steels with very viscous slag, briquettes of high density are required. Also the defoaming composite could be in various briquette shapes and sizes as well as in pellet and other forms. For example, the shape could be cylindrical, half cylindrical, rectangular, certain shapes being more preferable for transportation purposes, etc., as will be understood to persons skilled in the art.
  • the slag defoaming composite as described herein has the advantage that the density of a slag defoaming composite - 1 - briquette can be chosen so as to penetrate the surface of the slag, but not sink into the steel. Being suspended within the slag layer results in an efficient exothermic reaction therefore improving the release of gases and reduction of slag viscosity which is desired in order to achieve defoaming. As mentioned this.typical density range is in the vicinity of 1.0 to 2.6 g/cc.
  • Variation in the reactivity of the composite is controllable by variation in the composition thereof.
  • the very fine division of the ingredients used causes good dispersion of reactive elements and thus promotes a highly exothermic reaction to thin the slag.
  • the size, shape and hardness of the briquettes allows them to be handled and placed into hoppers which are held above the basic oxygen furnace without breakage, and to freefall into the furnace without loss of product or thermal reaction, before penetrating the slag.
  • a final important advantage of the slag defoaming composite is that it will not combust when stored in a hopper above the basic oxygen furnace and nor will it react exothermically with powdered lime which may enter into the hopper containing the composite.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)
  • Processing Of Solid Wastes (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)

Abstract

Composite anti-moussage pour laitier, comprenant une source de carbone, une source d'un matériau exothermique, telle que l'aluminium, ainsi qu'un matériau granulaire inerte et dense, tel que le silicate de calcium. Un liant est éventuellement également utilisé. Le composite, qui se présente de préférence sous forme de briquette ou de granules, est choisi de façon à présenter une densité suffisante pour pénétrer dans la couche de laitier au cours du traitement.
EP94906093A 1993-02-05 1994-02-04 Composite anti-moussage pour laitier. Withdrawn EP0682717A4 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
AUPL7152/93 1993-02-05
AUPL715293 1993-02-05
PCT/AU1994/000049 WO1994018347A1 (fr) 1993-02-05 1994-02-04 Composite anti-moussage pour laitier

Publications (2)

Publication Number Publication Date
EP0682717A1 true EP0682717A1 (fr) 1995-11-22
EP0682717A4 EP0682717A4 (fr) 1997-04-23

Family

ID=3776692

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94906093A Withdrawn EP0682717A4 (fr) 1993-02-05 1994-02-04 Composite anti-moussage pour laitier.

Country Status (5)

Country Link
EP (1) EP0682717A4 (fr)
JP (1) JPH08506144A (fr)
NZ (1) NZ261277A (fr)
OA (1) OA10453A (fr)
WO (1) WO1994018347A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6209457B1 (en) 1998-08-13 2001-04-03 Technology Commercialization Corp. Method and preformed composition for controlled localized heating of a base material using an exothermic reaction

Families Citing this family (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1454996B1 (fr) * 2003-03-07 2010-01-20 JTEKT Corporation Briquette pour matière première dans la production de fer et briquette pour l'introduction dans un appareillage produisant des scories
US9315825B2 (en) 2010-03-29 2016-04-19 The Trustees Of The University Of Pennsylvania Pharmacologically induced transgene ablation system
WO2011126808A2 (fr) 2010-03-29 2011-10-13 The Trustees Of The University Of Pennsylvania Système d'ablation de transgène induit pharmacologiquement
EP2699688A1 (fr) 2011-04-20 2014-02-26 The Trustees Of The University Of Pennsylvania Régimes et compositions pour l'immunisation passive médiée par aav contre des agents pathogènes en suspension dans l'air
CN102417940B (zh) * 2011-08-30 2013-03-13 郑州东升冶金新材料有限公司 一种用于高炉炼铁的消泡化渣保温剂及其制备方法
US9719106B2 (en) 2013-04-29 2017-08-01 The Trustees Of The University Of Pennsylvania Tissue preferential codon modified expression cassettes, vectors containing same, and uses thereof
EP3307310A2 (fr) 2015-05-13 2018-04-18 The Trustees Of The University Of Pennsylvania Expression médiée par aav d'anticorps anti-grippaux et leurs procédés d'utilisation
EP3368054A4 (fr) 2015-10-28 2019-07-03 Voyager Therapeutics, Inc. Expression régulable au moyen d'un virus adéno-associé (vaa)
JOP20190200A1 (ar) 2017-02-28 2019-08-27 Univ Pennsylvania تركيبات نافعة في معالجة ضمور العضل النخاعي
AU2018229293A1 (en) 2017-02-28 2019-08-29 Janssen Biotech, Inc. Influenza vaccines based on AAV vectors
US11827906B2 (en) 2017-02-28 2023-11-28 The Trustees Of The University Of Pennsylvania Adeno-associated virus (AAV) clade f vector and uses therefor
MX2023006444A (es) 2020-12-01 2023-08-10 Univ Pennsylvania Composiciones novedosas con motivos dirigidos a tejido específico y composiciones que los contienen.
AR125406A1 (es) 2021-04-23 2023-07-12 Univ Pennsylvania Nuevas composiciones con motivos selectivos para el cerebro y composiciones que las contienen
WO2023056399A1 (fr) 2021-10-02 2023-04-06 The Trustees Of The University Of Pennsylvania Nouvelles capsides de vaa et compositions les contenant
EP4469584A1 (fr) 2022-01-25 2024-12-04 The Trustees of The University of Pennsylvania Capsides d'aav pour une transduction cardiaque améliorée et un ciblage du foie
WO2024130070A2 (fr) 2022-12-17 2024-06-20 The Trustees Of The University Of Pennsylvania Capsides aav recombinantes avec motifs de ciblage spécifiques du muscle cardiaque et squelettique et leurs utilisations
EP4634394A2 (fr) 2022-12-17 2025-10-22 The Trustees of The University of Pennsylvania Vecteurs mutants aav recombinants avec motifs de ciblage spécifiques des muscles cardiaque et squelettique et compositions les contenant
WO2025007046A1 (fr) 2023-06-29 2025-01-02 The Trustees Of The University Of Pennsylvania Aav mutant à motifs de ciblage du système nerveux central et compositions les contenant
WO2025102034A1 (fr) 2023-11-10 2025-05-15 The Trustees Of The University Of Pennsylvania Thérapie génique pour le syndrome de barth
WO2025106661A1 (fr) 2023-11-14 2025-05-22 The Trustees Of The University Of Pennsylvania Compositions ayant des motifs de ciblage spécifiques des muscles cardiaques et squelettiques et leurs utilisations

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
No further relevant documents disclosed *
See also references of WO9418347A1 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6209457B1 (en) 1998-08-13 2001-04-03 Technology Commercialization Corp. Method and preformed composition for controlled localized heating of a base material using an exothermic reaction

Also Published As

Publication number Publication date
JPH08506144A (ja) 1996-07-02
WO1994018347A1 (fr) 1994-08-18
EP0682717A4 (fr) 1997-04-23
OA10453A (en) 2002-03-27
NZ261277A (en) 1997-04-24

Similar Documents

Publication Publication Date Title
WO1994018347A1 (fr) Composite anti-moussage pour laitier
US4105457A (en) Briquet and method of making same
US6676725B2 (en) Cold bonded iron particulate pellets
RU2224007C1 (ru) Угольный брикет, обладающий повышенной прочностью, а также способ его изготовления
US5240492A (en) Metallurgical fluxes
CA1215235A (fr) Agents de traitement de l'acier en fusion
US6074967A (en) Production of rock wool
RU2298041C2 (ru) Засыпка для покровного шлака, способ ее производства и применения
US2976162A (en) Briquetting granular material
JP2840592B2 (ja) 冶金目的用添加剤としてのシリコン含有残渣を包含してなる団鉱及びその製造方法
KR100847051B1 (ko) 제강용 탈산제 및 이의 제조방법
AU677632B2 (en) A slag defoaming composite
US4728358A (en) Iron bearing briquet and method of making
US3929955A (en) Process for producing agglomerates from fine-grained lignite or fine grained carbonized lignite or from mixtures of the two
JP2561615B2 (ja) 炉外精錬で用いる精錬用複合造滓剤の製造方法
US5002733A (en) Silicon alloys containing calcium and method of making same
US3079266A (en) Process for the manufacture of refractory materials and resultant product
AU648386B2 (en) Improvements in the manufacture of shaped refractory objects
US4139587A (en) Process for forming fluorspar compacts
EP0479487A1 (fr) Briquettes
CA1058883A (fr) Agglomeres de particules de silicone et de particules d'un alliage a base de silicone
RU2244017C2 (ru) Модификатор металлургического шлака магнезиального состава и способ его получения
US4518432A (en) Slag briquette
SU1335552A1 (ru) Способ изготовлени периклазоуглеродистого огнеупора
RU2243270C1 (ru) Состав шлакообразующего брикета для разливки стали в изложницы

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 19950905

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE CH DE DK ES FR GB GR IE IT LI LU MC NL PT SE

A4 Supplementary search report drawn up and despatched

Effective date: 19970307

AK Designated contracting states

Kind code of ref document: A4

Designated state(s): AT BE CH DE DK ES FR GB GR IE IT LI LU MC NL PT SE

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19970918