WO2002092534A1 - Verfahren zum brennen oder kalzinieren von geformten kohlenstoffkörpern in einem ringkammerofen - Google Patents
Verfahren zum brennen oder kalzinieren von geformten kohlenstoffkörpern in einem ringkammerofen Download PDFInfo
- Publication number
- WO2002092534A1 WO2002092534A1 PCT/DE2002/001201 DE0201201W WO02092534A1 WO 2002092534 A1 WO2002092534 A1 WO 2002092534A1 DE 0201201 W DE0201201 W DE 0201201W WO 02092534 A1 WO02092534 A1 WO 02092534A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- coke
- weight
- content
- cao
- carbon
- Prior art date
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/515—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics
- C04B35/52—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbon, e.g. graphite
- C04B35/528—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbon, e.g. graphite obtained from carbonaceous particles with or without other non-organic components
- C04B35/532—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbon, e.g. graphite obtained from carbonaceous particles with or without other non-organic components containing a carbonisable binder
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/64—Burning or sintering processes
Definitions
- the present invention relates to a method for calcining and firing shaped carbon bodies, in particular carbon or graphite electrodes, in ring chamber furnaces.
- anodes or cathodes for the production of aluminum by means of melt flow electrolysis in so-called ring chamber furnaces are fired at temperatures preferably from approximately 900 ° C. to 1300 ° C.
- Such furnace systems consist of a large number of stationary chambers over which there are generally several rotating fires, including u. a. from Brenneinrich-
- An annular chamber fen of the closed design is for example in WO 92/22780. described.
- the remaining cavities around them are generally covered with petroleum coke 0 (petroleum coke), carbon coke (metallurgical coke) and the like in a grain size of .1 mm to 20 mm, filled (hereinafter referred to as "filling coke").
- the filling coke is removed with the aid of a suction device and the anodes or cathodes removed.
- the uppermost anode or cathode blocks are caused by the combustion process 5 at risk of fire, which is why a covering layer, usually made of the same material as the filling coke, is also placed on its surface.
- a covering layer usually made of the same material as the filling coke.
- the thickness of the covering layer when using carbon coke is approx. 30 to 40 cm. when petroleum coke is used, it is approx. 55 to 70 cm.
- the top anodes are in the open anode furnace blocks are covered with a much thicker layer than the 0 closed furnace.
- a refractory material is proposed as an additional covering for the filling coke, the particles (in the form of spheres, granules, tablets or cubes) of which are larger than the particles of the filling coke, but smaller than about 50 mm.
- This classification should enable the coke and covering material to be separated and reused later.
- the layered balls of the alumina substance groups mentioned in the examples (90% by weight Al 2 O 3 , 10% by weight SiO 2 and 99% by weight Al 2 O 3 and 1% by weight SiO 2 ) and mullite ( 3.8% by weight of Al 2 O 3 and 66.2% by weight of SiO 2 ) are, however, extremely expensive to produce.
- an additional filler coke layer which is arranged under the refractory material, is absolutely necessary for the method in order to avoid burning off the upper surface of the carbon moldings.
- iron-rich slags then form during the firing process, which partially bake the covering material described and make separation by sieving from the rest of the filling and covering coke difficult.
- EP 0 779 258 A2 describes a material for filling the cavities between the carbon bodies and the walls of the individual chambers of the furnace, consisting of a homogeneous mixture of a carbon carrier and a material containing silicon oxide.
- the SiO 2 is intended to serve as a dispenser which absorbs contaminants, in particular sodium, which are released during the firing process and thus is intended to reduce the corrosion of the refractory chamber walls. It is considered a major advantage of this procedure that recycling material such as B. contaminated carbon filter dust and crushed used firebricks, can be used. Examples of the mixing ratios of the filling material and its production are given. Defined statements about the chemical composition of the silicon oxide-containing component are not given.
- the object of the invention is to improve the known methods for burning or calcining shaped carbon bodies.
- the invention accordingly includes, inter alia, a method for firing or calcining shaped coolant bodies covered with filling coke in an annular chamber furnace at temperatures above 900 ° C., the filling coke additionally containing a material containing CaO and cristobalite and / or tridymite, with a CaO - Content of 1.5 to 10 wt .-% and an SiO 2 content of 90 to 98.5 wt .-% are covered.
- the requirements described above for a covering material are surprisingly achieved.
- the covering material is placed over the filling coke, which surrounds the carbon moldings on all sides.
- a material is first produced by mixing at least one granular refractory raw material with an SiO 2 content of over 94% by weight with at least one raw material rich in CaO and optionally a binder, so that a moldable mass is formed.
- natural quartzite or recycled material from furnace linings are B. a coke oven compiled so that an SiO 2 90 to 99 wt .-%, preferably 93 to 95 wt .-% SiO 2 , is present in the dry mass.
- Lime milk, limestone and / or other calcium compounds are admixed as CaO raw material, to the extent that 1.5 to 10% by weight, preferably 2 to 4% by weight, based on the dry mass, are present.
- a binder z. B. sulfite and synthetic resins can be used.
- the raw materials are expediently put together with a grain structure of 0 to 10 mm, preferably 0-5 mm.
- the prepared mass is z. B. pressed into cuboid formings, dried and preferably sintered at temperatures between 900 and 1600 ° C. After firing, the moldings are crushed and classified into the grain size from 2 to 35 mm, preferably 6 to 20 mm.
- the prepared mass is shaped into bodies, for example cylinders, cubes and the like, in such a way that the desired particle size of 2 to 25 mm is obtained after firing, so that there is no need for comminution and subsequent classification.
- used silica stones e.g. B. from coke ovens and vaults of glass melting tanks, which already have a CaO content greater than 1.5% by weight, cristobalite and / or tridymite-rich and an SiO 2 content greater than 90% by weight to have.
- Such preliminary products are crushed to a grain size of 2 to 35 mm, preferably 6 to 20 mm.
- a layer of preferably filler coke is placed on the upper surface of the shaped carbon body in order to avoid burning.
- this layer is replaced by a material which is present as a covering material after the fire in the ring chamber furnace. This is achieved in such a way that when the SiO 2 and CaO raw material carriers are mixed, one or more carbon carriers are added, with sufficient handling strength being present after the shaping and subsequent temperature treatment, preferably below 350 ° C.
- the carbon burns in the CaO-containing mold and the sintered material can be used as a covering material, if necessary comminution and classification.
- cassette C an approx. 40 cm thick layer of carbon coke was also placed on the uppermost anode surface, and an approx. 5 cm thick layer consisting of the CaO-containing and cristobalite and tridymite-rich material in the grain size 2-12 was placed thereon mm.
- the CaO content was approximately 2.5% by weight, the SiO 2 content approximately 94.5% and the total content of tridymite and cristobalite was greater than 80% by weight.
- the material strength was approx. 3000 N, the bulk density was approx. 850 g / l.
- cassette D the carbon coke layer on the uppermost anode surface was reduced to 8 cm, then the same material according to the invention as in chamber C was placed in a layer thickness of approximately 15 cm.
- the total layer thickness over the top anode was approx. 23 cm, compared to cassettes A, B and C thus approx. 22 cm less.
- the material according to the invention could be removed from the chambers and used again as cover material in other cassettes in accordance with the above-mentioned procedures (examples cassette C and D). Even after more than five fires, the material showed no slag or crust formation and there were no caking on the cassette walls, which could react with the refractory stone material, in particular in the upper cassette wall area.
- the present examples illustrate that when the material is used, one Slag and crust formation, even after repeated use, is avoided and coal coke consumption is drastically reduced.
- the refractory stone material in the cassette stone wall is protected against slag corrosion by using the covering material, in particular in the upper cassette wall area.
- Particularly noteworthy in the example of the procedure in cassette D is that by reducing the overall layer thickness above the uppermost anode, it is now possible to burn larger anodes in the furnace without having to change the cassette dimensions.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Ceramic Products (AREA)
- Compositions Of Oxide Ceramics (AREA)
- Carbon And Carbon Compounds (AREA)
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SI200220014A SI21319A (sl) | 2001-05-17 | 2002-04-03 | Postopek za žganje ali kalciniranje oblikovanih ogljikovih teles v krožni komorni peči |
AU2002257550A AU2002257550B2 (en) | 2001-05-17 | 2002-04-03 | Method for baking or calcining shaped carbon bodies in an annular furnace |
CA2445130A CA2445130C (en) | 2001-05-17 | 2002-04-03 | A method for baking or calcining shaped carbon bodies in an ring furnace |
NO20034851A NO20034851L (no) | 2001-05-17 | 2003-10-30 | Fremgangsmåte for breinning eller kalsinering av formgitte karbonlegemer ien ringkammerovn |
HR20031035A HRP20031035B1 (en) | 2001-05-17 | 2003-12-15 | Method for baking or calcining shaped carbon bodies in an annular furnace |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10124299.9 | 2001-05-17 | ||
DE2001124299 DE10124299B4 (de) | 2001-05-17 | 2001-05-17 | Verfahren zum Brennen oder Kalzinieren von geformten Kohlenstoffkörpern in einem Ringkammerofen und Verfahren zur Herstellung eines Abdeckmaterials |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2002092534A1 true WO2002092534A1 (de) | 2002-11-21 |
Family
ID=7685307
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE2002/001201 WO2002092534A1 (de) | 2001-05-17 | 2002-04-03 | Verfahren zum brennen oder kalzinieren von geformten kohlenstoffkörpern in einem ringkammerofen |
Country Status (7)
Country | Link |
---|---|
AU (1) | AU2002257550B2 (de) |
CA (1) | CA2445130C (de) |
DE (1) | DE10124299B4 (de) |
HR (1) | HRP20031035B1 (de) |
NO (1) | NO20034851L (de) |
SI (1) | SI21319A (de) |
WO (1) | WO2002092534A1 (de) |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2314391A1 (de) * | 1972-03-23 | 1973-09-27 | Sumitomo Chemical Co | Verfahren zum brennen oder graphitieren von kohlenstofformkoerpern |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4119320C1 (de) * | 1991-06-12 | 1993-01-07 | Riedhammer Gmbh Und Co Kg, 8500 Nuernberg, De | |
NO306549B1 (no) * | 1995-12-15 | 1999-11-22 | Norsk Hydro As | Fremgangsmåte ved baking eller kalsinering av formede kull-legemer i en kalsineringsovn samt pakkmateriale for bruk i samme |
-
2001
- 2001-05-17 DE DE2001124299 patent/DE10124299B4/de not_active Expired - Fee Related
-
2002
- 2002-04-03 SI SI200220014A patent/SI21319A/sl not_active IP Right Cessation
- 2002-04-03 AU AU2002257550A patent/AU2002257550B2/en not_active Ceased
- 2002-04-03 CA CA2445130A patent/CA2445130C/en not_active Expired - Fee Related
- 2002-04-03 WO PCT/DE2002/001201 patent/WO2002092534A1/de active IP Right Grant
-
2003
- 2003-10-30 NO NO20034851A patent/NO20034851L/no not_active Application Discontinuation
- 2003-12-15 HR HR20031035A patent/HRP20031035B1/xx not_active IP Right Cessation
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2314391A1 (de) * | 1972-03-23 | 1973-09-27 | Sumitomo Chemical Co | Verfahren zum brennen oder graphitieren von kohlenstofformkoerpern |
Also Published As
Publication number | Publication date |
---|---|
NO20034851D0 (no) | 2003-10-30 |
CA2445130A1 (en) | 2002-11-21 |
HRP20031035A2 (en) | 2005-08-31 |
CA2445130C (en) | 2010-07-06 |
DE10124299A1 (de) | 2002-11-21 |
SI21319A (sl) | 2004-04-30 |
AU2002257550B2 (en) | 2007-03-15 |
DE10124299B4 (de) | 2007-04-26 |
HRP20031035B1 (en) | 2012-02-29 |
NO20034851L (no) | 2003-10-30 |
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