EP0079264B1 - Procédé d'agglomération sur grille de minerai de fer et installation de mise en oeuvre - Google Patents

Procédé d'agglomération sur grille de minerai de fer et installation de mise en oeuvre Download PDF

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Publication number
EP0079264B1
EP0079264B1 EP82401965A EP82401965A EP0079264B1 EP 0079264 B1 EP0079264 B1 EP 0079264B1 EP 82401965 A EP82401965 A EP 82401965A EP 82401965 A EP82401965 A EP 82401965A EP 0079264 B1 EP0079264 B1 EP 0079264B1
Authority
EP
European Patent Office
Prior art keywords
air
postignition
predrying
hood
oxidizing
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
Application number
EP82401965A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0079264A1 (fr
Inventor
François Temoin
Jean-Pierre Druet
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.)
Institut de Recherches de la Siderurgie Francaise IRSID
Sollac SA
Original Assignee
Institut de Recherches de la Siderurgie Francaise IRSID
Lorraine de Laminage Continu SA SOLLAC
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 Institut de Recherches de la Siderurgie Francaise IRSID, Lorraine de Laminage Continu SA SOLLAC filed Critical Institut de Recherches de la Siderurgie Francaise IRSID
Priority to AT82401965T priority Critical patent/ATE18577T1/de
Publication of EP0079264A1 publication Critical patent/EP0079264A1/fr
Application granted granted Critical
Publication of EP0079264B1 publication Critical patent/EP0079264B1/fr
Expired 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
    • C22B1/20—Sintering; Agglomerating in sintering machines with movable grates
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B21/00—Open or uncovered sintering apparatus; Other heat-treatment apparatus of like construction
    • F27B21/06—Endless-strand sintering machines

Definitions

  • the present invention relates to agglomeration on an iron ore grid. More specifically, it aims to lower the cost of the agglomeration operation by reducing the consumption of solid fuel (carbon) mixed with the charge to be agglomerated.
  • One of them is related to the humidity of the mixture, which is eliminated in the suction air after the ignition of the load.
  • the presence of water is due, among other things, to the necessary conditioning of the initial dry and pulverulent mixture of ore and coal, in pasty nodules capable of being correctly agglomerated.
  • the second factor results from the level of fines in the agglomerated mixture which must be kept at a certain level and whose variations are inversely proportional to those of the carbon content. But here too, it is known to intervene favorably by carrying out an operation, known as “post-ignition”, intended to stabilize the upper layer of the mixture for longer time after ignition. If necessary, it is recalled that the post-ignition operation consists schematically of replacing the cold air sucked through the charge immediately downstream of the ignition hood (in the direction of displacement of the charge) by a hot, slightly oxidizing gas. , which provides both the desired heat to the agglomerated upper layer and the oxidizing oxygen necessary for the propagation of combustion in the deep layers.
  • the two known measures for reducing the fuel consumption of the charge namely pre-drying and post-ignition, generally consist in substituting a hot gas passing through for a fraction of the carbon in the charge corresponding to the saving of combustible material. carried out.
  • Another object of the invention is to contribute to reducing the energy losses of a steel plant by a special recovery of its combustible gaseous effluents in an agglomeration installation.
  • the invention relates to an agglomeration process on an iron ore grid, according to which a pre-drying and a post-ignition are carried out, respectively before and after the ignition of the charge to be agglomerated, using hot gas streams passing through said charge, the post-ignition gas stream being oxidizing, characterized in that the pre-drying gas stream and the post-ignition gas stream are formed by fumes coming separately from the combustion of steel effluents, in that the fumes of said pre-drying gas stream are non-oxidizing, and in that the non-oxidizing pre-drying fumes are brought into contact with the charge to agglomerate at a temperature not exceeding 850 ° C.
  • these non-oxidizing fumes are produced under stoichiometric combustion conditions, in order to exhaust the energy resources of the burnt effluents.
  • the combustion of effluents for the production of oxidizing fumes intended for post-ignition is carried out with a controlled supply of excess combustion air so as to obtain oxidizing gases (containing for example, to fix ideas, 15% d oxygen at a temperature in the region of 850 ° C approximately).
  • the combustion air thus preheated is thermally controlled to arrive at the level of the charge at a temperature of the order of 500-550 ° C. and thus make it possible to respect the approximate value of 850 ° C. aimed for the temperature of the fumes. post-ignition.
  • This thermal control can be carried out by any suitable means, either for example, by subsequent addition of fresh dilution air to lower the temperature after preheating, or, on the contrary, by removing the air before preheating at the outlet of the cooler. of the agglomeration installation, which allows free combustion air for post-ignition, with a temperature already close to 200 ° C at the start.
  • this thermal control can very combine the two possibilities mentioned above, just as the air coming from a cooler can very well constitute, at least partially, the fresh air of dilution mentioned above.
  • another part of the air taken from the cooler advantageously serves as combustion air for the combustion of the effluents with a view to producing non-oxidizing pre-drying fumes.
  • the invention aims to replace part of the carbon of the feedstock with free alternative energy, or with low use value, provided by the combustible effluents of the steel industry itself .
  • blast furnace gas is not limited to this example but extends to other combustible effluents, such as refining gas to the converter or gas from arc furnaces.
  • blast furnace gas is a by-product obtained generally in large quantities (which we do not know what to do very often) and which, moreover, is in principle available in the vicinity of agglomeration facilities.
  • the invention is also placed at the level of the valuation of a poor combustible gas, ie of low calorific level, but widely available, and the possibilities of use of which remain a topical subject among the steelmakers of the world. whole.
  • the blast furnace gases are burned and the fumes obtained are used for pre-drying after having been previously cooled in an exchanger to a temperature desired.
  • the extracted calories are transferred to air which, when heated, advantageously serves as an oxidizer for the production of fumes intended for post-ignition by combustion, here too, of blast furnace gas.
  • a defining characteristic of the invention resides in a deliberately poor combustion efficiency at the level of the heat exchanger, with the aim, on the one hand, of keeping the fumes sufficiently hot for the purpose of pre-drying and, on the other hand On the other hand, to obtain a relatively moderate heating of the post-ignition combustion air (in view of the existing possibilities), so that the combustion fumes produced subsequently for the post-ignition remain around 850 ° C.
  • the subject of the invention is also an installation for implementing the method, this installation being defined in claims 9 to 12.
  • the combustion chamber has: a combustion air inlet pipe 8 advantageously connected to the outlet 19 of the air manifold of the cooler of the agglomeration grid, a fuel inlet pipe 10 connected to a source (not shown) of combustible iron and steel effluents (which is preferably the blast pipe of a blast furnace), and a pipe 11 for the outlet of the combustion fumes leading to the pre-drying hood 3.
  • a combustion air inlet pipe 8 advantageously connected to the outlet 19 of the air manifold of the cooler of the agglomeration grid
  • a fuel inlet pipe 10 connected to a source (not shown) of combustible iron and steel effluents (which is preferably the blast pipe of a blast furnace)
  • the heat exchanger 7 with internal air circulation has an inlet 12 and an outlet 13 respectively connected to the outlet 19 of the cooler and to the inlet of the post-ignition hood 4.
  • a fresh dilution air intake 14 is provided on the line 13 to ensure the thermal adjustment of the heated combustion air supplied to the post-ignition hood.
  • the installation also includes a pipe 15 taken from the pipe 13, which also supplies the ignition hood 2 with heated combustion air.
  • the ignition hood 2 as well as the post-ignition hood 4, are supplied with gaseous fuels coming from the same source as the boiler 5 (namely the blast of a blast furnace) respectively by the pipes 16 and 17.
  • a bypass 18 is mounted on the air outlet 19 of the cooler to join the line 15 supplying the ignition hood with heated combustion air.
  • the cooler In modern installations, the cooler most often constitutes additional equipment for the agglomeration chain, mounted at the outlet thereof. To simplify the figure, the cooler has been shown here as forming the end part of the chain itself.
  • pre-drying 3 in two autonomous functional units: a pre-drying by the combustion fumes, as described so far, preceded by a first pre-drying, at the entry of the chain immediately after the loading hopper, but this time without combustion and at a more moderate temperature, by passing air heated to 500 ° C for example, to avoid any risk of premature ignition of the load.
  • the method according to the invention is applicable to the agglomeration of all iron ores, poor or rich. It will however be borne in mind that, in the case of rich ores, the thermal needs of the agglomeration being, as we know, more modest, the energy gain of the process according to the invention as well as the volumes of gas put at stake will necessarily be lower than in the case of so-called “poor” minerals.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Environmental & Geological Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Baking, Grill, Roasting (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
EP82401965A 1981-11-02 1982-10-26 Procédé d'agglomération sur grille de minerai de fer et installation de mise en oeuvre Expired EP0079264B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82401965T ATE18577T1 (de) 1981-11-02 1982-10-26 Verfahren zum stueckigmachen von eisenerzen auf einem wanderrost und vorrichtung zur durchfuehrung des verfahrens.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8120622 1981-11-02
FR8120622A FR2515686A1 (fr) 1981-11-02 1981-11-02 Procede d'agglomeration sur grille de minerai de fer et installation de mise en oeuvre

Publications (2)

Publication Number Publication Date
EP0079264A1 EP0079264A1 (fr) 1983-05-18
EP0079264B1 true EP0079264B1 (fr) 1986-03-12

Family

ID=9263666

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82401965A Expired EP0079264B1 (fr) 1981-11-02 1982-10-26 Procédé d'agglomération sur grille de minerai de fer et installation de mise en oeuvre

Country Status (5)

Country Link
EP (1) EP0079264B1 (es)
AT (1) ATE18577T1 (es)
DE (1) DE3269869D1 (es)
ES (1) ES517037A0 (es)
FR (1) FR2515686A1 (es)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9011571B2 (en) * 2010-10-26 2015-04-21 Luossavaara-Kiirunavaara Ab Method, arrangement and pelletising plant
US9068243B2 (en) 2010-10-26 2015-06-30 Luossavaara-Kiirunavaara Ab Method, arrangement, and pelletising plant

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1956101B1 (en) * 2005-10-31 2012-08-15 JFE Steel Corporation Process for producing sintered ore
JP4735682B2 (ja) * 2008-08-21 2011-07-27 Ｊｆｅスチール株式会社 焼結鉱の製造方法および焼結機
SE535240C2 (sv) * 2010-10-26 2012-06-05 Luossavaara Kiirunavaara Ab Förfarande, anordning och kulsinterverk

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1215231A (fr) * 1958-11-12 1960-04-15 Siderurgie Fse Inst Rech Perfectionnements au procédé d'agglomération de minerai sur grille en vue d'obtenir un aggloméré plus résistant et plus gros
DE1148570B (de) * 1959-08-17 1963-05-16 Bergwerksverband Gmbh Verfahren zum Betrieb von Sinteranlagen
US3318590A (en) * 1965-02-10 1967-05-09 Mckee & Co Arthur G Moving bed agglomeration apparatus
US3732062A (en) * 1972-01-20 1973-05-08 J Porteus Method of and apparatus for reducing air pollution in the thermal processing of ores and other materials
DE2712989C2 (de) * 1977-03-24 1985-04-25 Metallgesellschaft Ag, 6000 Frankfurt Zündofen zur Zündung von Sintermischungen

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9011571B2 (en) * 2010-10-26 2015-04-21 Luossavaara-Kiirunavaara Ab Method, arrangement and pelletising plant
US9068243B2 (en) 2010-10-26 2015-06-30 Luossavaara-Kiirunavaara Ab Method, arrangement, and pelletising plant
US9719152B2 (en) 2010-10-26 2017-08-01 Luossavaara-Kiirunavaara Ab Method, arrangement, and pelletising plant

Also Published As

Publication number Publication date
ATE18577T1 (de) 1986-03-15
EP0079264A1 (fr) 1983-05-18
ES8307912A1 (es) 1983-08-01
FR2515686B1 (es) 1984-08-17
DE3269869D1 (en) 1986-04-17
FR2515686A1 (fr) 1983-05-06
ES517037A0 (es) 1983-08-01

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