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WO1993020244A1 - Injection de fines de minerai - Google Patents

Injection de fines de minerai Download PDF

Info

Publication number
WO1993020244A1
WO1993020244A1 PCT/GB1993/000621 GB9300621W WO9320244A1 WO 1993020244 A1 WO1993020244 A1 WO 1993020244A1 GB 9300621 W GB9300621 W GB 9300621W WO 9320244 A1 WO9320244 A1 WO 9320244A1
Authority
WO
WIPO (PCT)
Prior art keywords
slurry
furnace
fuel oil
ore fines
injected
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.)
Ceased
Application number
PCT/GB1993/000621
Other languages
English (en)
Inventor
David Armour Campbell
Nicholas James Busby
Richard Brian Smith
Sivagnanam Ravindran
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.)
British Steel PLC
Original Assignee
British Steel PLC
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 British Steel PLC filed Critical British Steel PLC
Priority to EP93906756A priority Critical patent/EP0728220A1/fr
Publication of WO1993020244A1 publication Critical patent/WO1993020244A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B5/00—Making pig-iron in the blast furnace
    • C21B5/001—Injecting additional fuel or reducing agents
    • C21B5/003—Injection of pulverulent coal
    • C21B5/004—Injection of slurries

Definitions

  • the invention relates to the injection of ore fines into a blast furnace for the smelting of iron.
  • a blast furnace the fuel, fluxes, and additives have traditionally been added from the top of the furnace and a blast of air or oxygen, often heated is injected at the bottom. The process is well known, and will not be described further.
  • a method of injecting ore fines into a blast furnace wherein the fines are first mixed into a slurry with fuel oil and the fuel oil and fines slurry is injected into the furnace.
  • the ore fines may comprise in part iron oxide recovered from the processing of steel and the processing of steel may be the hot rolling thereof.
  • Liquids also can be injected at the tuyeres, and can of course be pressurised so that they do not require the assistance of the gas blast in order to enter the furnace.
  • Particularly fuel oil has been injected as a fuel to reduce the amount of coke that has to be charged from the top, and oil/powdered coal slurries have been injected to form a combined fuel.
  • Ore fines have been injected, to reduce the amount of prepared ore needing to be charged from the top, and in practice it has been found that large quantities of fines can be injected without significantly affecting the blast furnace performance. 300Kg per tonne of hot metal have been injected without trouble, and it has been found that the permeability of the blast furnace charge increases as the rate of ore fines injected from the bottom increases.
  • the injection of solids in the blast requires special design and engineering of the handling system, and the fines have needed to be dried beforehand so as to be entrainable in the blast gases.
  • the slurry is composed typically of equal weights of ore and oil and is fed to the blast furnace by a ring main so that it may be injected by a series of lances, possibly via the blast tuyeres, around the blast furnace.
  • the rates of injection of the slurry are typically for a large blast furnace about 45-70Kg of oil per tonne of hot metal.
  • the injection system for the slurry is the one that is used for the injection of fuel oil already present in many furnaces and therefore modifications to the furnace are minimised. Furthermore the low velocities of the slurry obviate to a large extent the problems of wear and abrasion in the supply system-
  • the slurry has been made solely by mixing ore fines with fuel oil.
  • a somewhat similar mixture is already available which can, with suitable processing, be added to the slurry.
  • mill waste such as in the form of scale are removed from the surface of the steel as it is being processed.
  • This scale is recovered as an oily and wet mixture which is difficult to dispose of.
  • the larger pieces can be recycled through the blast furnace sinter plant, but a considerable amount of very finely divided iron oxide mixed with water and with hydrocarbon oil must be disposed of.
  • this iron oxide and indeed low grade iron oxide generally can be mixed with the fuel oil/ore fines slurry after it has been de-watered and re-injected into the blast furnace without adversely affecting the process of the invention.
  • De-watering can be carried out simply by allowing the waste to drain from a
  • the invention provides a means of recycling a steel processing waste product that up to now has proved troublesome and expensive to dispose of.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacture Of Iron (AREA)

Abstract

Procédé d'injection de fines de minerai dans un haut fourneau consistant à mélanger les fines de minerai pour obtenir une boue contenant du mazout et à injecter la boue contenant le mazout et les fines de minerai dans le fourneau.
PCT/GB1993/000621 1992-03-27 1993-03-26 Injection de fines de minerai Ceased WO1993020244A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP93906756A EP0728220A1 (fr) 1992-03-27 1993-03-26 Injection de fines de minerai

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB929206672A GB9206672D0 (en) 1992-03-27 1992-03-27 Fines injection
GB9206672.9 1992-03-27

Publications (1)

Publication Number Publication Date
WO1993020244A1 true WO1993020244A1 (fr) 1993-10-14

Family

ID=10712938

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1993/000621 Ceased WO1993020244A1 (fr) 1992-03-27 1993-03-26 Injection de fines de minerai

Country Status (3)

Country Link
EP (1) EP0728220A1 (fr)
GB (1) GB9206672D0 (fr)
WO (1) WO1993020244A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000022174A1 (fr) * 1998-10-08 2000-04-20 Třinecké Železárny A.S. Procede d'alimentation de combustibles de remplacement vers un haut fourneau
KR100584760B1 (ko) * 2001-12-26 2006-05-30 주식회사 포스코 타르 코팅 분철광석 취입 방법
KR100742603B1 (ko) 2001-06-05 2007-07-25 주식회사 포스코 고로 내부의 미분을 제거하기 위한 타르코팅된 분철광석및 그 제조방법

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE194042C (fr) *
DE4104072A1 (de) * 1991-02-11 1992-08-13 Fechner Bruno Gmbh & Co Kg Recyclingverfahren fuer oelhaltigen walzzunder

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE194042C (fr) *
DE4104072A1 (de) * 1991-02-11 1992-08-13 Fechner Bruno Gmbh & Co Kg Recyclingverfahren fuer oelhaltigen walzzunder

Non-Patent Citations (8)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 002, no. 122 (C-024)13 October 1978 *
PATENT ABSTRACTS OF JAPAN vol. 005, no. 075 (C-055)19 May 1981 *
PATENT ABSTRACTS OF JAPAN vol. 005, no. 111 (C-063)18 July 1981 *
PATENT ABSTRACTS OF JAPAN vol. 012, no. 202 (C-503)10 June 1988 *
PATENT ABSTRACTS OF JAPAN vol. 012, no. 263 (C-514)22 July 1988 *
PATENT ABSTRACTS OF JAPAN vol. 012, no. 283 (C-518)3 August 1988 *
PATENT ABSTRACTS OF JAPAN vol. 012, no. 372 (C-533)5 October 1988 *
PATENT ABSTRACTS OF JAPAN vol. 013, no. 241 (C-604)6 June 1989 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000022174A1 (fr) * 1998-10-08 2000-04-20 Třinecké Železárny A.S. Procede d'alimentation de combustibles de remplacement vers un haut fourneau
KR100742603B1 (ko) 2001-06-05 2007-07-25 주식회사 포스코 고로 내부의 미분을 제거하기 위한 타르코팅된 분철광석및 그 제조방법
KR100584760B1 (ko) * 2001-12-26 2006-05-30 주식회사 포스코 타르 코팅 분철광석 취입 방법

Also Published As

Publication number Publication date
GB9206672D0 (en) 1992-05-13
EP0728220A1 (fr) 1996-08-28

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