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EP0421979B1 - Procédé pour diminuer l'émission du soufre dans des procédés de frittage - Google Patents

Procédé pour diminuer l'émission du soufre dans des procédés de frittage Download PDF

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Publication number
EP0421979B1
EP0421979B1 EP90890268A EP90890268A EP0421979B1 EP 0421979 B1 EP0421979 B1 EP 0421979B1 EP 90890268 A EP90890268 A EP 90890268A EP 90890268 A EP90890268 A EP 90890268A EP 0421979 B1 EP0421979 B1 EP 0421979B1
Authority
EP
European Patent Office
Prior art keywords
coke
sulfur
ashing
sintered
mixture
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.)
Expired - Lifetime
Application number
EP90890268A
Other languages
German (de)
English (en)
Other versions
EP0421979A1 (fr
Inventor
Horst Dipl.-Ing. Sulzbacher
Harald Dipl.-Ing. Derler
Heinz Schöllnhammer
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.)
Voestalpine Stahl Linz GmbH
Voestalpine Rail Technology GmbH
Original Assignee
Voestalpine Stahl GmbH
Voestalpine Schienen GmbH
Voestalpine Stahl Linz GmbH
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 Voestalpine Stahl GmbH, Voestalpine Schienen GmbH, Voestalpine Stahl Linz GmbH filed Critical Voestalpine Stahl GmbH
Publication of EP0421979A1 publication Critical patent/EP0421979A1/fr
Application granted granted Critical
Publication of EP0421979B1 publication Critical patent/EP0421979B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • C22B1/00—Preliminary treatment of ores or scrap
    • C22B1/14—Agglomerating; Briquetting; Binding; Granulating
    • C22B1/16—Sintering; Agglomerating
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G OR C10K; LIQUIFIED PETROLEUM GAS; USE OF ADDITIVES TO FUELS OR FIRES; FIRE-LIGHTERS
    • C10L9/00—Treating solid fuels to improve their combustion
    • C10L9/10—Treating solid fuels to improve their combustion by using additives

Definitions

  • the invention relates to a method for reducing pollutant emissions in thermal processes, such as in particular sintering processes, in which a fuel-containing mixture, in particular a coke bed, is ignited.
  • the invention now aims to provide a method of the type mentioned in the introduction, in which, without increasing the amount of materials to be handled, enriched with pollutants, a reduction in pollutant emissions, in particular an almost complete desulfurization of the exhaust gases can be achieved without complex flue gas desulfurization.
  • the invention consists essentially in the fact that the pore-rich fuel fraction, in particular the coke, of the mixture is rolled with Ca (OH) 2 before the fuel-containing mixture is fed in.
  • the process according to the invention is preferably carried out in such a way that, based on the amount of coke, 5-30% by weight Ca (OH) 2, preferably 10-25% by weight, are used in dry form and the coke is rolled together with the hydrated lime .
  • Ca (OH) 2 preferably 10-25% by weight
  • Sinter coke is primarily used for such sintering purposes, as mentioned above, and in the process according to the invention it is preferred to use sinter coke in a grain size of 0.5-5 mm, preferably 1 to 3 mm.
  • the sulfur incorporation could be further optimized by controlling the process temperatures and, according to a preferred procedure, the sintering temperatures are kept low.
  • a sample of the coke mixed with hydrated lime was placed in a retort and heated in a tube furnace with air supply at a heating rate of approx. 5 ° C./min.
  • the exhaust gas composition was continuously measured during the heating phase.
  • the ignition point of the sample mixtures was characterized by a significantly faster rise in the sample temperature and the beginning of C02 development.
  • the ignition temperature of the sample of Example 1 was not determined and that of Example 2 was 495 ° C.
  • the ignition temperature of the untreated coke with a grain size of 1 to 3 mm is 490 ° C.
  • the sintered coke samples pretreated according to Examples 1 and 2 were subjected to ashing.
  • the ashing was carried out at three different temperatures, namely 900 ° C, 1000 ° C and 1100 ° C.
  • the incorporation of sulfur into the ashes was determined by carrying out a sulfur analysis before and after ashing.
  • the results of the sulfur incorporation in the ashes are shown in Figure 1, which is a block diagram of the sulfur incorporation in the ashes.
  • Fig.l the percent sulfur inclusion is shown on the ordinate and arranged on the abscissa, side by side, the results of the three ashing tests carried out with untreated coke and with the sintered coke breeze treated with hydrated lime.
  • Relatively balanced sulfur binding values at the three ashing temperatures could be achieved with the sinter coke pretreated according to the example.
  • the largest percentage of sulfur incorporation is achieved at the lowest ashing temperature and the relatively lowest percentage of sulfur incorporation can be achieved at the highest ashing temperature.
  • the percentages of sulfur incorporation in the sinter coke pretreated according to the invention are at least four times as high as those which could be achieved in the ashing of untreated coke.
  • the sulfur emission via sintered exhaust gases depends on the sulfur content of the sintered coke. This sulfur burns primarily to S02. A reduction in S02 formation is theoretically possible even through a sulfidic bond in the sinter.
  • Rolling with hydrated lime ensures optimal distribution of the sulfide-forming calcium and thus close contact with the sulfur of the fuel.
  • S02 is produced, but also CaS, because reducing conditions are also possible in the coke particle.
  • the temporary setting of the coke sulfur in the sinter reduces the S02 emissions through the sintered exhaust gas and helps to comply with or fall below the prescribed emission values.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Manufacturing & Machinery (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Metallurgy (AREA)
  • Geology (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Combustion & Propulsion (AREA)
  • Solid Fuels And Fuel-Associated Substances (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Treatment Of Sludge (AREA)

Claims (4)

  1. Procédé pour diminuer les émissions de substances nocives dans des opérations thermiques, en particulier des opérations de frittage, dans lesquelles on enflamme un mélange contenant un combustible, en particulier un lit de coke, caractérisé en ce que, avant le chargement du mélange contenant un combustible, on soumet la fraction combustible poreuse du mélange, en particulier le coke, à mélange au tambour rotatif avec Ca(OH)₂.
  2. Procédé selon la revendication 1, caractérisé en ce que l'on utilise, par rapport à la quantité de coke, de 5 à 30 % en poids de Ca(OH)₂, de préférence de 10 à 25 % en poids, à l'état sec, et on mélange le coke avec la chaux hydratée au tambour rotatif.
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce que l'on utilise le coke de frittage à un intervalle de dimension de grain de 0,5 à 5 mm, de préférence de 1 à 3 mm.
  4. Procédé selon l'une des revendications 1 à 4, caractérisé en ce que, avant passage au tambour rotatif, le coke de frittage est séché par de la chaux hydratée.
EP90890268A 1989-10-06 1990-10-05 Procédé pour diminuer l'émission du soufre dans des procédés de frittage Expired - Lifetime EP0421979B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT2315/89 1989-10-06
AT2315/89A AT393095B (de) 1989-10-06 1989-10-06 Verfahren zum verringern der schwefelemission bei sinterprozessen

Publications (2)

Publication Number Publication Date
EP0421979A1 EP0421979A1 (fr) 1991-04-10
EP0421979B1 true EP0421979B1 (fr) 1994-03-30

Family

ID=3532090

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90890268A Expired - Lifetime EP0421979B1 (fr) 1989-10-06 1990-10-05 Procédé pour diminuer l'émission du soufre dans des procédés de frittage

Country Status (7)

Country Link
US (1) US5116588A (fr)
EP (1) EP0421979B1 (fr)
JP (1) JPH03192194A (fr)
KR (1) KR910008151A (fr)
AT (1) AT393095B (fr)
DE (1) DE59005179D1 (fr)
ES (1) ES2053170T3 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT395828B (de) * 1991-06-28 1993-03-25 Voest Alpine Stahl Donawitz Verfahren zur verringerung von schadstoffemissionen bei sinterprozessen
KR100321621B1 (ko) * 1997-12-27 2002-05-13 이구택 질소산화물및황산화물을저감할수있는소결광제조방법
EP0992594A1 (fr) * 1998-10-08 2000-04-12 Sidmar N.V. Procédé de réduction des émissions de dioxines et de furanes par les installations d'agglomération de minerais de fer
US20060127599A1 (en) * 2002-02-12 2006-06-15 Wojak Gregory J Process and apparatus for preparing a diamond substance
JP2008504427A (ja) * 2004-06-28 2008-02-14 ノックス・ツー・インターナショナル・リミテッド 炭素質燃料の燃焼から生じる硫黄ガスの放出の低減
JP5617766B2 (ja) * 2011-06-08 2014-11-05 新日鐵住金株式会社 炭材の改質処理設備
JP5598439B2 (ja) * 2011-07-20 2014-10-01 新日鐵住金株式会社 焼結鉱の製造方法
JP5810836B2 (ja) * 2011-10-28 2015-11-11 新日鐵住金株式会社 焼結鉱製造用の改質炭材の製造方法

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE234059C (fr) *
DE131959C (fr) *
DE19591C (de) * 1900-01-01 Dr. TH. OPPLER in Doos bei Nürnberg Verfahren zur Absorption von gas- und dampfförmigen Säuren durch Briquettes
DE2154955C3 (de) * 1971-11-05 1979-08-23 Rheinische Braunkohlenwerke Ag, 5000 Koeln Verwendung von Braunkohlenkokspellets für die Sinterung und Verfahren zur Herstellung dieser Pellets
DE2501503C3 (de) * 1975-01-16 1978-04-20 Ruhrkohle Ag, 4300 Essen Verfahren zur Verminderung des Schwefelgehaltes in Abgasen von Wirbelbettfeuerungen
US4093451A (en) * 1977-09-28 1978-06-06 Cardd, Inc. Coke agglomerate and method of utilizing same
DE3016496C2 (de) * 1980-04-25 1984-06-14 Mannesmann AG, 4000 Düsseldorf Verfahren zur Verringerung der Schadstoffemission beim Sintern
DE3131959A1 (de) * 1981-08-13 1983-02-24 Johann Schaefer Kalkwerke, 6252 Diez "verfahren zur herstellung einer homogenen mischung aus feinteiligem kalkhydrat und feuchter kohle"
JPS5876728A (ja) * 1981-10-31 1983-05-09 Tokyo Electric Co Ltd ロ−ドセル式台秤
DD234059A1 (de) * 1985-01-18 1986-03-19 Buna Chem Werke Veb Verfahren zur entgiftung der rauchgase von feuerungsanlagen
DE3635206A1 (de) * 1986-10-16 1988-04-21 Westfaelische Berggewerkschaft Verfahren zur verfeuerung fossiler festbrennstoffe unter entwicklung von rauchgasen mit herabgesetztem schwefelgehalt
SE457014B (sv) * 1987-03-25 1988-11-21 Abb Stal Ab Saett att foerbaettra utnyttjningen av svavelabsorbent vid foerbraenning i en fluidiserad baedd och en kraftanlaeggning med foerbraenning i fluidiserad baedd

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
Deutsches Wörterbuch (Mosaik Verlag, 1986/87) Seite 1075 *
Metallurgie des Eisens (Gmelin-Durrer, Verlag Chemie, 1964) Band 1a, Seiten 393a-401a *

Also Published As

Publication number Publication date
ES2053170T3 (es) 1994-07-16
EP0421979A1 (fr) 1991-04-10
JPH03192194A (ja) 1991-08-22
DE59005179D1 (de) 1994-05-05
KR910008151A (ko) 1991-05-30
ATA231589A (de) 1991-01-15
AT393095B (de) 1991-08-12
US5116588A (en) 1992-05-26

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