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EP1029093A1 - Procede pour retraiter des laitiers d'acier et des materiaux ferriferes - Google Patents

Procede pour retraiter des laitiers d'acier et des materiaux ferriferes

Info

Publication number
EP1029093A1
EP1029093A1 EP99944155A EP99944155A EP1029093A1 EP 1029093 A1 EP1029093 A1 EP 1029093A1 EP 99944155 A EP99944155 A EP 99944155A EP 99944155 A EP99944155 A EP 99944155A EP 1029093 A1 EP1029093 A1 EP 1029093A1
Authority
EP
European Patent Office
Prior art keywords
slags
slag
furnace
bath
hot
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Withdrawn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
EP99944155A
Other languages
German (de)
English (en)
Inventor
Alfred Edlinger
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 EP1029093A1 publication Critical patent/EP1029093A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B3/00—General features in the manufacture of pig-iron
    • C21B3/04—Recovery of by-products, e.g. slag
    • C21B3/06—Treatment of liquid slag
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B2400/00—Treatment of slags originating from iron or steel processes
    • C21B2400/02—Physical or chemical treatment of slags
    • C21B2400/022—Methods of cooling or quenching molten 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
    • 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

Definitions

  • the invention relates to a method for working up steel slags and iron supports, e.g. Electric furnace, converter slags, fine ores, dusts from steel production, mill scale for the production of pig iron and environmentally compatible slags.
  • steel slags and iron supports e.g. Electric furnace, converter slags, fine ores, dusts from steel production, mill scale for the production of pig iron and environmentally compatible slags.
  • Slags have a relatively low thermal conductivity and about 1.5 to 2 times the heat capacity compared to iron.
  • the achievable heat transfer or the so-called degree of afterburning is essential for the economy of such a method.
  • the degree of afterburning is defined as follows:
  • Hb enthalpy of the gas (at melting temperature) Hp C. • combustion enthalpy (at melting temperature) is in the known procedures for an economical. Procedure not sufficient.
  • Thermal efficiencies of well over 70% are not achieved with conventional blast furnace technologies or with other processes, such as fluidized bed processes. It is already known, for example, to blow pre-reduced and at least partially preheated batches together with coal into a fluidized bed, with coal being gasified in a fluidized bed while reducing the batch, and sponge iron being melted and drawn off. To make matters worse, such meltdown gasification reactions are generally optimized for the desired pig iron discharge, so that an environmentally compatible slag is not formed.
  • Converter slags and, in particular, LD slags are distinguished from electric furnace slags by a substantially higher basicity CaO / SiO 2 of mostly more than 3, whereas electric furnace slags have a somewhat lower basicity.
  • the primary aim was to guide the process in a converter and a more or less complex blowing technology was used. In principle, this was older processes are naturally also suitable for use in ovens or pans.
  • the present invention now aims to improve the known methods for use, in particular with electric furnace slags, and at the same time to find sufficiency with less expenditure on equipment than in accordance with the older proposals.
  • ovens or pans means that much more cost-effective facilities are used, in which the cost share of refractory delivery is also significantly lower.
  • a substantially higher basicity of up to 2.5 is thus considered permissible in the process according to the invention, so that in particular electric furnace slag without lime scale or without any noteworthy Lowering the basicity can be used immediately.
  • complete control of the waste streams occurring in electric steel plants can now be ensured within the framework of an electric steel plant.
  • a blowing in or blowing oxygen or hot air through the bath can be omitted entirely, so that the equipment can be significantly reduced.
  • carbon can be supplied via simple lances or floor nozzles, which does not significantly increase the costs for the pan or the oven. Carbon can also be blown into the bath using immersion lances.
  • coarse-grained carbon it is also possible for coarse-grained carbon to be fed directly onto the molten bath from above, it being possible to use a pan which is stirred on the ground.
  • the process according to the invention is advantageously carried out in such a way that additives from the group of fine ores, dusts, mill scale and possibly further fuel are added to the exhaust gases removed in a further external afterburning section and the heated solids are blown onto the slag together with the hot wind.
  • Waste streams from the electrical steelworks can of course also be melted at least partially into this afterburning section, with the degree of afterburning in the furnace or pan setting between 0.7 and 0.85 there is still sufficient chemical energy in the exhaust gases to ensure such effective afterburning outside the furnace or pan.
  • the procedure can also be such that the combustion exhaust gases of the afterburning section are conducted via a hot cyclone for separating the possibly liquefied solids and a heat exchanger for heating the hot wind, whereby a particularly high energy yield is achieved.
  • the partially cold waste streams can advantageously be melted before the task, with the procedure preferably being such that the additives are melted in a melting cyclone and the basic slags, such as e.g. Steel slags or electric furnace slags are added, whereupon the mixed slags are placed in the furnace or pan and the hot 02-containing propellant gases of the melting cyclone are blown onto the slags as a hot wind.
  • the basic slags such as e.g. Steel slags or electric furnace slags are added
  • An effective limitation of the afterburning in the furnace or the pan and a corresponding convection with high heat transfer inside the gas space of the furnace or the pan can still be improved in that in the line for the hot exhaust gases of the furnace or the pan against the gas pressure reduced pressure is maintained in the gas space of the oven or pan.
  • the method according to the invention primarily gives advantages in connection with the operation of an electrical steel plant, with concentrated zinc or zinc oxide-containing products, which arise from the dust produced, being further refined on site or being passed on directly to metallurgical processors .
  • the strongly basic metallurgical residues and excavation materials such as furnace excavation material, can be converted into a high-quality clinker substitute and high-quality pig iron by adding inexpensive acidic fine ores.
  • To lower the basicity of the Electric furnace slag or converter slag can also advantageously be used in blast furnace slag.
  • Such materials are produced in an electric furnace steel plant, with electric furnace slag usually being produced in 10 to 12 times the amount of ladle slag or filter dust.
  • electric furnace slag usually being produced in 10 to 12 times the amount of ladle slag or filter dust.
  • acid component a fine ore quality of the following composition was used as the acid component:
  • X CaO (mixed slag) - (C / S). Si ⁇ (mixed slag) (C / S). Si ⁇ 2 (fine ore) - CaO (fine ore)
  • filter dust melts from waste incineration plants can of course also be used successfully, although care must be taken to ensure that the filter dust melts are largely free of heavy metals.
  • a common composition of such filter ash or fly ash from thermal power plants is given below:
  • the mixed slag obtained had the following composition:
  • Slag and dusts from other incineration plants can thus also be disposed of in the pan or in the oven in a simple manner, and, as mentioned at the beginning, the process control according to the invention is of particularly high economic importance in electric furnace steelworks.
  • FIG. 1 shows a first embodiment of a device for carrying out the method according to the invention and FIG. 2 shows a second embodiment of the device.
  • 1 denotes a hearth furnace in which the slag 2 floats on the iron template 3. Hot wind is blown over the feed lance 4 for post-combustion of the CO formed from the bath carbon, the hot exhaust gases from the furnace 1 being drawn off tangentially to the axis 5 of the mouth of the hot wind feed lance 4 via an opening 6.
  • the exhaust gases removed are admixed with additives from the group of fine ores, dusts, mill scale and possibly further fuel and passed over a hot cyclone 8 to separate any liquefied solids and a gas regenerative heat exchanger 9.
  • a gas regenerative heat exchanger 9 cold air is heated, whereupon the hot wind is fed to the supply lance 4 via a line 10 and is blown onto the slag bath 2 together with the liquefied solids separated in the hot cyclone 8.
  • a dust regenerative heat exchanger 11 can additionally be arranged between the hot wind supply lance 4 and the afterburning section 7.
  • FIG. 2 shows a modified embodiment of the device according to FIG. 1, the reference numbers being retained for the same parts.
  • the combustion exhaust gases drawn off through the opening 6 of the furnace 1 are fed directly to a gas regenerative heat exchanger for heating the hot wind.
  • Hot wind is fed via a line 12 to a melting cyclone 13, in which the additives introduced via line 17 opening into line 12 are melted.
  • the liquefied additives are mixed in a pan 14 with the steel slag supplied via the line 15, whereupon the mixed slag formed is placed in the furnace 1, as indicated schematically by 16.
  • the hot 0 2 -containing propellant gases of the melting cyclone 13 are blown over the feed lance 4 as a hot wind onto the slags 2.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mechanical Engineering (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Abstract

L'invention concerne un procédé permettant de retraiter des laitiers d'acier et des matériaux ferrifères, tels que par ex. des laitiers d'acier de fours électriques, de convertisseurs, des minerais fins, des poussières issues de la production d'acier, des calamine de laminoirs pour produire de la fonte brute et des laitiers non-polluants. Un bain de laitier et de fer fondu est utilisé dans un rapport volumique compris entre 0,5 :1 et 1,5 :1 et les supports de carbone sont introduits dans le bain et un vent chaud est injecté. Il ressort des laitiers de départ et des matériaux ferrifères, un laitier mixte d'une basicité CaO/SiO2 comprise entre 1,2 et 2,5, qui est placé dans un four à sole ou dans une poche. Un vent chaud est injecté pour permettre une postcombustion du CO dégagé du carbone du bain, avec un degré de postcombustion PC = (a) (CO2 + H2O)/(CO + CO2 + H2 + H2O), entre 0,70 et 0,85. Les gaz brûlés chauds du four ou de la poche sont évacués de manière tangentielle à l'axe de l'embouchure de la lance de guidage du vent chaud.
EP99944155A 1998-09-15 1999-09-14 Procede pour retraiter des laitiers d'acier et des materiaux ferriferes Withdrawn EP1029093A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
AT0155698A AT407051B (de) 1998-09-15 1998-09-15 Verfahren zum aufarbeiten von stahlschlacken und eisenträgern
AT155698 1998-09-15
PCT/AT1999/000224 WO2000015855A1 (fr) 1998-09-15 1999-09-14 Procede pour retraiter des laitiers d'acier et des materiaux ferriferes

Publications (1)

Publication Number Publication Date
EP1029093A1 true EP1029093A1 (fr) 2000-08-23

Family

ID=3515952

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99944155A Withdrawn EP1029093A1 (fr) 1998-09-15 1999-09-14 Procede pour retraiter des laitiers d'acier et des materiaux ferriferes

Country Status (8)

Country Link
US (1) US6364929B1 (fr)
EP (1) EP1029093A1 (fr)
AT (1) AT407051B (fr)
AU (1) AU5720199A (fr)
CA (1) CA2310044A1 (fr)
ES (1) ES2151473T1 (fr)
WO (1) WO2000015855A1 (fr)
ZA (1) ZA200002582B (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SK286015B6 (sk) * 2000-01-28 2008-01-07 Holcim Ltd. Spôsob spracovania prachov a prachových zmesí
EP1586666A1 (fr) * 2004-04-13 2005-10-19 Paul Wurth S.A. Procédé de valorisation de laitiers métallurgiques provenant de l'élaboration de l'acier
ITMI20111111A1 (it) * 2011-06-20 2012-12-21 Minerals & Metals Italia S P A Composizione per la fabbricazione di ghisa in alto forno e di acciaio in forno elettrico
IT202100007661A1 (it) * 2021-03-29 2022-09-29 Cicsa S R L Metodo per il raffreddamento ed il recupero termico da materiali ad altissima temperatura
CN113817228A (zh) * 2021-09-28 2021-12-21 长春工业大学 一种除铁尾矿渣的改性方法
CN115615188B (zh) * 2022-12-20 2023-03-10 山西建龙实业有限公司 富氧双室熔池熔炼侧吹炉及其熔融钢渣提铁调质的方法
CN116854418B (zh) * 2023-09-04 2023-11-03 唐山瑞坤环境检测服务有限公司 一种碳捕集钢渣基热烟气养护混凝土及其制备方法与应用

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4000886A (en) * 1975-03-24 1977-01-04 J. T. Cullen Company Furnace exhaust duct
US4102675A (en) * 1975-04-16 1978-07-25 Nippon Kokan Kabushiki Kaisha Method of treating molten slags in steel making process
DE3739344A1 (de) * 1987-03-31 1988-10-20 Kloeckner Humboldt Deutz Ag Erzeugung von roheisen durch reduktion von feinkoernigem eisenerz mittels kohlenstoff- und sauerstofftraegern und anlage zur durchfuehrung des verfahrens
AT403290B (de) * 1995-02-07 1997-12-29 Holderbank Financ Glarus Verfahren zur herstellung von roheisen oder stahl und zementklinker aus schlacken
HRP970303B1 (en) 1996-06-05 2002-06-30 Holderbank Financ Glarus Method for making pozzolans, synthetic blast-furnance slag, belite or alite clinkers, and pig-iron alloys, from oxidic slag and a device for implementing this method
HRP990143B1 (en) * 1997-09-15 2002-04-30 Holderbank Financ Glarus Process for working up steel slags and iron carriers for obtaining pig iron and environmentally safe slags

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0015855A1 *

Also Published As

Publication number Publication date
ES2151473T1 (es) 2001-01-01
CA2310044A1 (fr) 2000-03-23
ATA155698A (de) 2000-04-15
US6364929B1 (en) 2002-04-02
ZA200002582B (en) 2000-11-21
AT407051B (de) 2000-12-27
AU5720199A (en) 2000-04-03
WO2000015855A1 (fr) 2000-03-23

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