EP0125305B1 - Procede pour minimiser la decomposition par reduction de minerais de fer et d'agglomerats de minerais de fer utilises en tant que lit de fusion de haut fourneau - Google Patents

Procede pour minimiser la decomposition par reduction de minerais de fer et d'agglomerats de minerais de fer utilises en tant que lit de fusion de haut fourneau Download PDF

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Publication number
EP0125305B1
EP0125305B1 EP84900031A EP84900031A EP0125305B1 EP 0125305 B1 EP0125305 B1 EP 0125305B1 EP 84900031 A EP84900031 A EP 84900031A EP 84900031 A EP84900031 A EP 84900031A EP 0125305 B1 EP0125305 B1 EP 0125305B1
Authority
EP
European Patent Office
Prior art keywords
iron ore
iron
reduction
ores
agglomerates
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
EP84900031A
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German (de)
English (en)
Other versions
EP0125305A1 (fr
Inventor
Heinrich Kortmann
Wolfgang Bock
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.)
Studiengesellschaft fuer Eisenerzaufbereitung
Original Assignee
Studiengesellschaft fuer Eisenerzaufbereitung
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Publication date
Application filed by Studiengesellschaft fuer Eisenerzaufbereitung filed Critical Studiengesellschaft fuer Eisenerzaufbereitung
Priority to AT84900031T priority Critical patent/ATE27713T1/de
Publication of EP0125305A1 publication Critical patent/EP0125305A1/fr
Application granted granted Critical
Publication of EP0125305B1 publication Critical patent/EP0125305B1/fr
Expired legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B5/00—Making pig-iron in the blast furnace
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B5/00—Making pig-iron in the blast furnace
    • C21B5/008—Composition or distribution of the charge
    • 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
    • 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

Definitions

  • the invention relates to a method for minimizing grain decay in the blast furnace or downhole furnace of iron ores and iron ore agglomerates.
  • the grain decay of iron ore and iron ore agglomerates in the blast furnace at the beginning of reduction (reduction decay) in the range of low temperatures of approx. 400 ° C - 600 ° C in a weakly reducing atmosphere was assessed as an extremely negative property of a blast furnace mortar.
  • a strong reduction in reduction leads to a high accumulation of gout dust and build-up, hinders the gas flow, increases the reduction and fuel consumption, reduces the production output and deteriorates the pig iron quality.
  • the technical disadvantages listed also mean not insignificant economic disadvantages. So strong reduction decay z. B. the fuel consumption in the form of coke and possibly oil up to 10% of normal consumption, the z. Z. at approx. 400 - 500 kg / t of pig iron lies, let rise.
  • Decay caused by storage can be counteracted by shorter storage times or by adding certain proportions of basic additives. However, this can only be realized to a limited extent and through increased manufacturing costs of the pellets and z. To buy T. by metallurgical disadvantages. Often there is only the choice to adapt the products directly to the current needs. The result is frequent shutdowns.
  • Chlorine sodium and other chlorides are mentioned as particularly effective salts that are suitable for glaze formation.
  • the glaze formers should be added to the ores either before they are briquetted, during firing under the influence of flame gases, or when making pig iron immediately before it is introduced into the reduction furnace.
  • the invention provides a remedy here.
  • the invention has for its object to propose a method in which the grain decay of iron ores and iron ore agglomerates used in the furnace with the furnace furnace is reduced at the start of the reduction in the range of low temperatures.
  • the object is achieved in that iron ore agglomerates are treated after their hardening and prior to smelting and iron ores before smelting when used in the blast furnace with reagents which cause grain breakdown during the reduction in the temperature range largely prevent between 400 ° C - 600 ° C.
  • any reduction in the decomposition of a contaminant can be reduced to a very decisive extent if the contaminant is treated with solid halogen-containing reagents or with aqueous halogen-containing solutions before being used in the blast furnace.
  • halogens or their compounds contained in solutions or suspensions can be obtained from e.g. B. NaCI, CaCl 2 , KCI, KJ, KBr, Na 2 SiF 6 exist.
  • the halogens can e.g. B. from sea water (NaCI).
  • the treatment is simple by powdering or by spraying or by immersing the filling substance in the corresponding solutions which still act in a large dilution.
  • a reduction in the breakdown of the grain which has a different effect, occurs depending on the type of furniture, the reagent and its concentration.
  • the other quality features, such as mechanical strength, reducibility, stability at 1050 ° C reduction temperature or thresholds, are not changed in any way by the treatment.
  • the z. B. in a blast furnace with the Möller introduced pollutants from the treatment are discharged either with the slag or in the top gas from the furnace.
  • the treatment itself was carried out by briefly immersing the examined substances in a solution of a certain chemical composition and concentration. After removing the test material from the solution, the excess solution is allowed to drain. To determine the amount of solution taken up, the sample is weighed wet, then dried at 105 ° C. ⁇ 5 ° C., weighed again and the amount of solution taken up is determined from the difference “wet weight minus dry weight” and a reagent uptake is calculated therefrom.
  • Table 1 shows the chemical analysis of the examined pellets in percent by weight.
  • Table 3 shows that treatment of the pellets with halide-containing solutions of NaCl, KCI and CaC1 2 improves the reduction strength, whereas the values for Na 2 CO 3 and Na 4 P 2 O 7 solutions show no influence.
  • the other halogens such as iodine, bromine and fluorine
  • solutions or reagents containing halides regardless of the starting materials - iron ore pellet types - have a positive effect on the reduction strength
  • Example 4 the influence of the treatment with a NaCl solution on the reduction decomposition of different types of pellets was investigated.
  • H 2 0 uptake results when the pellets are treated with solutions. In the examples in Table 6, this is between 2.9 and 4.2% H 2 0. However, a moisture content of this magnitude is within the permissible range of commercially available pellets. Nevertheless, these contents can be reduced if the halogen concentration in the solutions is increased, in particular when using sea water or solutions similar to sea water in higher concentration ranges of about 30 g / l as NaCl. The real amount can be determined by simple experiments.
  • a particular advantage of the subject matter of the invention is that treatments of iron ores or iron ore agglomerates with reagents or solutions containing halides can be carried out both at the producer and at the consumer and during transport from the producer to the consumer. Since iron ores and pellets are mostly transported and stored openly, certain wash-out effects can be expected in the event of a previous treatment. This influence is clear from the next example.
  • This example shows the influence of the washout effect of pellets treated with NaCl solution on the reduction decomposition and the Na 2 0, K 2 0 and CI contents by water absorption.
  • the following example shows how a pellet grade that has deteriorated due to aging can be raised to a fully sufficient strength level by treatment with a solution containing NaCI.
  • Table 10 shows the results of experimental example 7 on treated pellets according to table 9 with different storage periods.
  • the values in Table 10 again show that, according to the teaching of the invention, a high reduction resistance compared to untreated pellets is achieved and, moreover, that a high reduction resistance can also be restored even in the case of aged pellets if the teaching of the invention is used.
  • the same procedure can also be used for sinters that have deteriorated due to storage.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Organic Chemistry (AREA)
  • Metallurgy (AREA)
  • Materials Engineering (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Disintegrating Or Milling (AREA)

Abstract

Les résultats montrent qu'il est possible de minimiser la décomposition par réduction de minerais de fer et d'agglomérats dans chaque cas grâce à des halogènes, respectivement à leurs composés chimiques. Le degré des améliorations dépend de la concentration puisque la quantité d'agent actif introduite dépend proportionnellement de celle-ci pour une même quantité de solution absorbée. En outre, la nature du réactif a son importance, étant donné que ces hautes fractions stoechiométriquement différentes contiennent des halogènes. En règle générale, plus la diminution de la décomposition par réduction est forte, plus la concentration de la solution est importante. Afin de n'introduire dans la solution que le moins possible d'éléments chimiques, il faudrait déterminer pour chaque lit de fusion la concentration la plus petite possible.

Claims (6)

1. Procédé peur minimiser la décomposition granulaire des minerais de fer ainsi que des agglomérés de minerai de fer dans un haut fourneau ou dans un bas fourneau, lors du début d'une réductien dans un domaine de températures compris entre 400°C et 600°C, suivant lequel les minerais de fer, avant leur traitement métallurgique, et les agglomérés de minerai de fer, après leur production, mais avant leur traitement métallurgique, sont traités avec des réactifs solides, qui renferment des composés halogénés, caractérisé par le fait que les minerais de fer et les agglomérés de minerai de fer présentent, après le traitement, une fraction massique de 20 g à 370 g en halogène provenant des composés halogénés, par tonne de minerai de fer ou d'aggloméré de minerai de fer.
2. Procédé peur minimiser la décompesition granulaire des minerais de fer ainsi que des agglomérés de minerai de fer dans un haut fourneau ou dans un bas fourneau, lors du début d'une réduction dans un domaine de températures compris entre 400°C et 600°C, suivant lequel les minerais de fer, avant leur traitement métallurgique, et les agglomérés de minerai de fer, après leur production, mais avant leur traitement métallurgique, sont traités avec des réactifs liquides, qui renferment des composés halogénés, caractérisé par le fait que les minerais de fer et les agglomérés de minerai de fer présentent, après le traitement avec des solutions aqueuses d'une concentration de 0,1 g/I à à 50 g/I de fraction halogénée provenant des composés halogénés, une fraction massique de 20 g à 370 g d'halogène provenant des composés halogénés, par tonne de minerai de fer ou d'aggloméré de minerai de fer.
3. Procédé selon la revendication 2, caractérisé par le fait que l'on utilise de l'eau de mer comme réactif halogéné liquide.
4. Procédé selon les revendications 2 et 3, caractérisé par le fait que les solutions aqueuses renfermant des composés halogénés sont pulvérisées sur les minerais de fer ou les agglomérés de minerai de fer.
5. Procédé selon les revendications 2 et 3, caractérisé par le fait que, pour l'absorption d'halogènes, les minerais de fer ou les agglomérés de minerai de fer sont introduits dans un bain d'immersion de solutions aqueuses renfermant des composés halogenes.
6. Procédé selon la revendication 1, caractérisé par le fait que les réactifs se présentant sous forme solide sont appliqués par poudrage sur les minerais de fer ou les agglomérés de minerai de fer.
EP84900031A 1982-11-13 1983-10-13 Procede pour minimiser la decomposition par reduction de minerais de fer et d'agglomerats de minerais de fer utilises en tant que lit de fusion de haut fourneau Expired EP0125305B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84900031T ATE27713T1 (de) 1982-11-13 1983-10-13 Verfahren zur minimierung des reduktionszerfalls von eisenerzen und eisenerzagglomeraten als hochofenmoeller.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3242086 1982-11-13
DE3242086A DE3242086C2 (de) 1982-11-13 1982-11-13 Verfahren zur Minimierung des Reduktionszerfalls von Eisenerzen und Eisenerzagglomeraten als Hochofenmöller

Publications (2)

Publication Number Publication Date
EP0125305A1 EP0125305A1 (fr) 1984-11-21
EP0125305B1 true EP0125305B1 (fr) 1987-06-10

Family

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Family Applications (1)

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EP84900031A Expired EP0125305B1 (fr) 1982-11-13 1983-10-13 Procede pour minimiser la decomposition par reduction de minerais de fer et d'agglomerats de minerais de fer utilises en tant que lit de fusion de haut fourneau

Country Status (12)

Country Link
US (1) US4695315A (fr)
EP (1) EP0125305B1 (fr)
JP (1) JPS59502070A (fr)
KR (1) KR890002650B1 (fr)
AU (1) AU564541B2 (fr)
CA (1) CA1220343A (fr)
DE (1) DE3242086C2 (fr)
ES (1) ES527198A0 (fr)
MX (1) MX161658A (fr)
NO (1) NO158465C (fr)
WO (1) WO1984001963A2 (fr)
ZA (1) ZA838408B (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3733480C1 (de) * 1987-07-30 1989-01-19 Mannesmann Ag Verfahren zur Verringerung des Kornzerfalls
US5372628A (en) * 1993-09-10 1994-12-13 Akzo N.V. Method for producing reducible iron-containing material having less clustering during direct reduction and products thereof
US5476532A (en) * 1993-09-10 1995-12-19 Akzo Nobel N.V. Method for producing reducible iron-containing material having less clustering during direct reduction and products thereof
KR100426233B1 (ko) * 1999-12-08 2004-04-08 주식회사 포스코 소결광의 환원분화지수 개선장치
JP5366069B2 (ja) * 2008-03-26 2013-12-11 パウダーテック株式会社 フェライト粒子及びその製造方法
JP5546675B1 (ja) * 2012-12-07 2014-07-09 新日鉄住金エンジニアリング株式会社 高炉の操業方法及び溶銑の製造方法

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE289727C (fr) *
US2771355A (en) * 1954-12-06 1956-11-20 Cohen Harry Agglomerating ores in the blast furnace
US2888341A (en) * 1956-10-12 1959-05-26 Dow Chemical Co Method of treating particulate iron ore
US3062639A (en) * 1959-07-21 1962-11-06 Kellogg M W Co Treatment of iron-containing materials
BE677083A (fr) * 1966-02-25 1966-08-25
US3615342A (en) * 1969-08-27 1971-10-26 Bethlehem Steel Corp Process for producing iron ore pellets of low alkali content and containing flux material
US3975182A (en) * 1973-08-09 1976-08-17 United States Steel Corporation Pellets useful in shaft furnace direct reduction and method of making same

Non-Patent Citations (9)

* Cited by examiner, † Cited by third party
Title
Ashton et al, Proc. Iron making Conf., Iron Steel Div, Metallurg Soc. Amer. Inst. min. metallurg. petrol, 33 (1973) S. 60-74. *
Eisenhüttenkunde, 9. Lehrbrief, Bergakademie Freiberg, 1955, S. 126 *
Erzmetall, Washing of Iron Ores, 33 (1980) No. 7/8, S. 387-390. *
Fachberichte Hüttenpraxis Metallweiterverarbeitung Vol. 20, No. 1, 1982, S. 2-9 *
K. Meyer, Pelletizing of Iron Ores, Springer-Verlag Berlin 1980, S. 35-37, 56, 109, 115-116, 126, 127, 161, 183-188 *
Kemmer et al, Schwierigkeiten im Hochofenbetrieb bei Verwendung alkalischer Pellets, Region. techn. Meet. Amer. Iron Steel Inst. 1972, S. 15 *
Lueger, Lexikon der Technik, 4. Aufl. 1963, Bd 5, S. 659-660 *
Stahl und Eisen, 1970, No. 13 S. 667-676, 696, 697 *
Ullmanns Enzyklopädie der techn. Chemie, 4. Aufl. 1982 Bd 22, S. 228-231 *

Also Published As

Publication number Publication date
MX161658A (es) 1990-12-05
DE3242086A1 (de) 1984-05-17
KR890002650B1 (ko) 1989-07-22
NO158465C (no) 1989-11-22
NO158465B (no) 1988-06-06
EP0125305A1 (fr) 1984-11-21
CA1220343A (fr) 1987-04-14
US4695315A (en) 1987-09-22
WO1984001963A3 (fr) 1984-06-21
KR840006504A (ko) 1984-11-30
WO1984001963A2 (fr) 1984-05-24
ZA838408B (en) 1984-07-25
AU564541B2 (en) 1987-08-13
JPS59502070A (ja) 1984-12-13
ES8406553A1 (es) 1984-08-01
NO834120L (no) 1984-05-14
DE3242086C2 (de) 1984-09-06
ES527198A0 (es) 1984-08-01
AU2343584A (en) 1984-06-04

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