EP0577127A1 - Procédé et installation de fabrication d'agglomérés pauvres en gaz et thermiquement et mécaniquement stables, par exemple des briquettes ou des boulettes - Google Patents

Procédé et installation de fabrication d'agglomérés pauvres en gaz et thermiquement et mécaniquement stables, par exemple des briquettes ou des boulettes Download PDF

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Publication number
EP0577127A1
EP0577127A1 EP93110532A EP93110532A EP0577127A1 EP 0577127 A1 EP0577127 A1 EP 0577127A1 EP 93110532 A EP93110532 A EP 93110532A EP 93110532 A EP93110532 A EP 93110532A EP 0577127 A1 EP0577127 A1 EP 0577127A1
Authority
EP
European Patent Office
Prior art keywords
rotary kiln
agglomerates
mineral solids
bed
fine
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
EP93110532A
Other languages
German (de)
English (en)
Inventor
Klaus Jungk
Ulrich Hüwel
Alfred Benninghoven
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.)
Deutz AG
Original Assignee
Kloeckner Humboldt Deutz 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 Kloeckner Humboldt Deutz AG filed Critical Kloeckner Humboldt Deutz AG
Publication of EP0577127A1 publication Critical patent/EP0577127A1/fr
Ceased legal-status Critical Current

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    • 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
    • C22B1/24—Binding; Briquetting ; Granulating
    • C22B1/242—Binding; Briquetting ; Granulating with binders
    • C22B1/244—Binding; Briquetting ; Granulating with binders organic
    • C22B1/245—Binding; Briquetting ; Granulating with binders organic with carbonaceous material for the production of coked agglomerates

Definitions

  • the invention relates to a method and a plant for producing mechanically and thermally stable, low-gas agglomerates such as briquettes or pellets for use as a feedstock in metallurgical processes or as a fuel, consisting of mixtures of fine-grained mineral solids such as ores or ore processing products, quartz sand, Reactive agents, carbon carriers such as coal, coke, petroleum coke, dried sewage sludge or the like with the addition of a thermoplastic binder, such as bitumen or tar pitch, above whose softening temperature the mineral solids are mixed and agglomerated and the agglomerates are subjected to a thermal aftertreatment to expel the volatile constituents of the binder and / or the mineral solids are subjected to a rotary tube furnace in a fine-grained immersion bed formed from mineral solids.
  • a thermoplastic binder such as bitumen or tar pitch
  • preforms are formed from quartz sand, a carbon carrier and a bituminous binder and these are formed in a rotary tube furnace in which a quartz sand plunge bed is subjected to a thermal treatment.
  • the thermal treatment of the preforms takes place at a temperature of up to 500 ° C. largely in the absence of air with the aim of degassing and carbonizing the bituminous binder and the further carbon carriers in the preforms as far as possible.
  • the quartz sand of the quartz sand dipping bed is discharged from the rotary kiln with the finished raw material briquettes, separated from the finished raw material briquettes and then at least partially returned to the rotary kiln in the hot state and partially used to produce the preforms.
  • the quartz sand of the quartz sand dipping bed should be recirculated on a statistical average about three times into the rotary kiln before it is used to produce the preforms.
  • the amount of quartz sand that is removed from the quartz sand dipping bed for the production of the preforms is fed back to the rotary kiln together with the preforms as fresh quartz sand.
  • a disadvantage of this known method is that the chemical composition of the quartz sand must be determined before the recirculated quartz sand is used to produce the preforms, since this can be contaminated with carbon in varying amounts by abrasion and breakage of the preforms.
  • the object of the invention is to provide a method and a plant with which, using the known method and avoiding the disadvantages described above, the production of mechanically and thermally stable low-gas agglomerates can be carried out in a simple and reliable manner, the quality of which according to this Process-produced low-gas agglomerates allow these agglomerates to be used without restriction, for example for reduction processes in blast furnaces, cupola furnaces and electric furnaces, as well as in shaft furnaces and electric furnaces in the non-iron and steel industry, and the carbon agglomerates produced according to this process are comparable to the quality of conventional cokes such as foundry coke.
  • a favorable influence on the course of metallurgical reactions or on a combustion process can have the effect that some or all of the substances used as reaction partners are intimately mixed with one another and in close contact with one another in the form of agglomerates in the metallurgical process or in the combustion process be introduced.
  • the stoichiometric composition of the reaction mixture required for the reaction is kept constant and that no disturbing and undesirable constituents get into the reaction mixture.
  • the measure according to the invention of forming the fine-grained immersion bed from the same mineral substances that are also used for the production of the agglomerates, the chemical composition of the immersion bed and agglomerates also corresponding to one another, allows partial quantities of the immersion bed to be produced without complex chemical analysis of agglomerates can be used.
  • the entire material discharged at the end of the rotary kiln consisting of agglomerates, agglomerate fragments and fine-grained immersion bed solids, is separated by a sieving device in such a way that usable agglomerates, for example agglomerates larger than 20 mm (coarse product), an intermediate product, for example in the grain size 20 to 2 mm and a fine product with a grain size of, for example, less than 2 mm is obtained.
  • the fraction smaller than 2 mm can now be fed directly back to the rotary kiln or to the mixer for the production of the agglomerates, while the middle product must first be fed to a comminution.
  • the degassing of the preforms corresponds to pyrolysis, in which only the volatile constituents are released which can be volatilized up to 500 ° C., so that the briquettes emerging from the rotary kiln still contain remaining volatile constituents contain what their later use z. B. severely restricted in terms of use in metallurgical processes. Furthermore, at a furnace temperature of approximately 500 ° C., a complete burn-off of the gases released is not guaranteed, so that complex gas cleaning of the gases emerging from the furnace must take place.
  • the immersion bed formed from a carbon carrier enters into a reaction exchange with the furnace gas.
  • This exchange of reactions prevents the agglomerates from burning up due to the large surface area (in relation to the surface of the agglomerates) offered by the fine-grained immersion bed and the reducing conditions prevailing in the immersion bed - oxidation (combustion) is only possible above the immersion bed.
  • the combustion required to maintain the furnace temperature occurs exclusively above the diving bed by burning the expelled volatile constituents from the agglomerates as well as by combustion reactions on the surface of the diving bed itself.
  • the dwell time of the agglomerates in the immersion bed which is adapted to the properties of the mineral solids used - the dwell time can be adjusted by the length, inclination and speed of the rotary kiln - it is possible to produce agglomerates that have been completely degassed in carbon agglomerates with coke quality characteristics of cokes of known processes.
  • the invention Due to the high amount of oxygen in the rotary kiln according to the invention, a completely exhausted furnace exhaust gas is obtained, which makes subsequent cleaning unnecessary. Since even at these high temperatures, especially when using dried sewage sludge as a carbon carrier, dioxins can still be formed, the invention provides, however, that the rotary kiln gas leaving the rotary kiln is fed to a post-combustion, the heat content of the resulting gases being used to heat the combustion air for the rotary kiln is used.
  • the control of the partial pressure of oxygen takes place over the entire length of the furnace, so that it is ensured that the combustion takes place at every point of the furnace in such a way that no external energy has to be supplied (only auxiliary burners are required) and the volatile constituents escaping completely.
  • the aim of controlling the oxygen partial pressure is also to prevent combustion at the end of the furnace, so that this part of the furnace can be used to cool the agglomerates.
  • the mineral solids (9) to be compacted are first comminuted in a processing plant (10) to the required grain size, for example to less than 1 mm, mixed together and heated to the temperature required for the compaction, which is above the softening point of the thermoplastic binder used .
  • the preheated mixture is then fed to a mixer (11), in which the thermoplastic binder, for example bitumen or tar pitch, is fed in via a line (12) and mixed with the mineral solids.
  • the discharge of the mixer (11) is connected to an agglomeration device (12) in which the mixture discharged from the mixer is agglomerated.
  • the agglomeration device can be, for example, a roller briquette press or a device for producing pellets.
  • the agglomerates produced in the agglomeration device (12) reach the rotary tube furnace (13), which is designed as a direct current furnace, directly via an entry device. Abrasion and incorrect discharge of the agglomeration are also fed to the rotary kiln (13).
  • the agglomerates become one in this rotary tube furnace (13), which contains a fine-grained immersion bed made of the same mineral solids and with the same chemical composition as the agglomerates produced, up to approx. 1000 ° C subjected to thermal treatment, whereby volatile constituents of the agglomerates are released and burned in the rotary kiln.
  • the thermal energy required for the thermal treatment is fed to the rotary kiln via a support burner (14), by supplying preheated combustion air (15) and by burning the released volatile constituents from the agglomerates.
  • the coarse product (17) containing the usable agglomerates is led out of the system, the fine product (18) can be fed directly via a line (21) to the rotary kiln (13) to form the immersion bed. If necessary, this fine product (18) can also be discharged from the system as a separate finished product (19), for which purpose cooling in a cooling device (20) is required beforehand.
  • the middle product (23) separated in the screening plant (16) is first comminuted in a comminution device (24) to, for example, less than 2 mm and then fed into the line (21) for the fine product (18).
  • a line (25) it is also possible to feed this middle product back into the treatment directly via a line (25).
  • the rotary kiln gases leaving the rotary kiln (13) at the discharge end are first thermally treated in a post-combustion device (26) with the aid of a burner (27) in order to burn combustible components still contained in the gas, in particular formed dioxin.
  • the thermal energy of the rotary kiln gas heated in this way is then used in a heat exchange device (28) for heating fresh air (29), which is then fed to the rotary kiln (13) as preheated combustion air (15).
  • the rotary kiln gas cooled by the heat exchange device (28) is then dedusted in a dedusting device (31); The cleaned gas is removed from the system, the separated dust is returned to the preparation (10) via a line (30).

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Processing Of Solid Wastes (AREA)
EP93110532A 1992-07-01 1993-07-01 Procédé et installation de fabrication d'agglomérés pauvres en gaz et thermiquement et mécaniquement stables, par exemple des briquettes ou des boulettes Ceased EP0577127A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE4221253 1992-07-01
DE4221253 1992-07-01
DE19934314403 DE4314403A1 (de) 1992-07-01 1993-04-30 Verfahren und Anlage zur Herstellung von mechanisch und thermisch stabilen, gasarmen Agglomeraten wie Briketts oder Pellets
DE4314403 1993-04-30

Publications (1)

Publication Number Publication Date
EP0577127A1 true EP0577127A1 (fr) 1994-01-05

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP93110532A Ceased EP0577127A1 (fr) 1992-07-01 1993-07-01 Procédé et installation de fabrication d'agglomérés pauvres en gaz et thermiquement et mécaniquement stables, par exemple des briquettes ou des boulettes

Country Status (2)

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EP (1) EP0577127A1 (fr)
DE (1) DE4314403A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013110953A1 (de) 2013-10-02 2015-04-02 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Verfahren zum Betreiben einer Stabilisatoranordnung

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19958871B4 (de) * 1998-10-21 2004-07-01 Sekundärrohstoff-Verwertungszentrum Schwarze Pumpe Gmbh Verfahren zur Verwertung von teerhaltigen Rückständen
DE19848432B4 (de) * 1998-10-21 2004-04-01 Sekundärrohstoff-Verwertungszentrum Schwarze Pumpe Gmbh Verfahren zur Beseitigung von teerhaltigen Rückständen
CN1077602C (zh) * 1999-08-20 2002-01-09 方新贵 中温快速固结铁焦团矿的制造方法及干燥设备

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2011700A1 (en) * 1970-03-12 1971-09-30 Fried Krupp GmbH, 4300 Essen Hardening of pitch bonded ore pellets
EP0138100A2 (fr) * 1983-09-30 1985-04-24 C. Deilmann AG Procédé pour la fabrication de masses ou corps actifs, riches en carbone
DE3724541A1 (de) * 1987-07-24 1989-02-02 Applied Ind Materials Verfahren und anlage zur herstellung von rohstoff-briketts fuer die erzeugung von silicium oder von siliciumcarbid oder von ferrosilicium
DE3939018C1 (en) * 1989-11-25 1991-05-16 Applied Industrial Materials Corp. Aimcor, Deerfield, Ill., Us Method of making furnace briquettes - has raw sand and carbon carrying material mixes before heating

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2011700A1 (en) * 1970-03-12 1971-09-30 Fried Krupp GmbH, 4300 Essen Hardening of pitch bonded ore pellets
EP0138100A2 (fr) * 1983-09-30 1985-04-24 C. Deilmann AG Procédé pour la fabrication de masses ou corps actifs, riches en carbone
DE3724541A1 (de) * 1987-07-24 1989-02-02 Applied Ind Materials Verfahren und anlage zur herstellung von rohstoff-briketts fuer die erzeugung von silicium oder von siliciumcarbid oder von ferrosilicium
DE3939018C1 (en) * 1989-11-25 1991-05-16 Applied Industrial Materials Corp. Aimcor, Deerfield, Ill., Us Method of making furnace briquettes - has raw sand and carbon carrying material mixes before heating

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013110953A1 (de) 2013-10-02 2015-04-02 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Verfahren zum Betreiben einer Stabilisatoranordnung

Also Published As

Publication number Publication date
DE4314403A1 (de) 1994-01-05

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