EP0215192B1 - Elektrodenbindemittel - Google Patents

Elektrodenbindemittel Download PDF

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Publication number
EP0215192B1
EP0215192B1 EP86107033A EP86107033A EP0215192B1 EP 0215192 B1 EP0215192 B1 EP 0215192B1 EP 86107033 A EP86107033 A EP 86107033A EP 86107033 A EP86107033 A EP 86107033A EP 0215192 B1 EP0215192 B1 EP 0215192B1
Authority
EP
European Patent Office
Prior art keywords
content
weight
pitch
anodes
binder
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
EP86107033A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0215192A1 (de
Inventor
Friedhelm G. Dipl.-Ing. Alsmeier
Rolf Dipl.-Ing. Marrett
Manfred Dipl.-Ing. Meinbreckse
Jürgen W. Dr. Stadelhofer
Werner C. Fischer
Raymond Perruchoud
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.)
Ruetgers Germany GmbH
Original Assignee
Ruetgerswerke 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 Ruetgerswerke AG filed Critical Ruetgerswerke AG
Publication of EP0215192A1 publication Critical patent/EP0215192A1/de
Application granted granted Critical
Publication of EP0215192B1 publication Critical patent/EP0215192B1/de
Expired legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10C—WORKING-UP PITCH, ASPHALT, BITUMEN, TAR; PYROLIGNEOUS ACID
    • C10C1/00—Working-up tar

Definitions

  • the invention relates to an electrode binder made of coal tar for the production of shaped carbon bodies, as are used, for example, in the production of aluminum.
  • a carbon anode for aluminum extraction should have high strength, low porosity, low electrical resistance and the lowest possible burn-up. These properties are decisively influenced by the binder used. It is characterized by its softening point, the coking residue and the content of insoluble parts in quinoline and toluene, as well as ash and sulfur. Often the density and the distillation process are also used for the specification. Coal tar pitches are used almost exclusively as binders because of their favorable coking behavior. They have the following specification data (Ullmann's Encyclopedia of Industrial Chemistry, 4th edition, volume 22, page 423):
  • the ß-resins in particular affect the baking and binding capacity, and the QI content increases the strength of the binder coke. Ash formers are undesirable because they contribute to the contamination of the aluminum.
  • the aim of the aluminum smelters is to develop an anode with high conductivity and low erosion in order to reduce operating costs. Only a part of the used carbon is used for the reduction of the aluminum ore, another part goes through side reactions, e.g. Conversion of carbon dioxide to carbon monoxide, and lost by "sanding" the anode.
  • the "sanding" is caused by a faster consumption of the binder medium coke compared to petroleum coke, whereby the filler coke grain loosens from the composite and falls into the bath.
  • Coal tars already contain sodium as raw tars.
  • the Na content is further increased by the usual neutralization of the acid chloride ions to reduce corrosion in the distillation plants.
  • the ash formers and therefore also the sodium are concentrated in the pitch, so that the electrode binders normally contain about 500 to 1500 ppm sodium.
  • the ash formers can be removed from tars and pitches by suitable separation processes such as centrifuging, separating, filtering and promoter-accelerated settling. In these processes, however, the quinoline-insoluble material required for anode strength is also deposited.
  • the object was therefore to develop an electrode binder based on coal tar, with which anodes of high strength, low electrical resistance and low air permeability can be produced, which show reduced 00 2 burn-off and less severe "sanding".
  • the object is achieved by a coal tar pitch with a softening point (Kraemer-Sarnow) of 90 to 105 ° C., a content of quinoline-insoluble (QI) / of 0.5 to 5% by weight, 25 to 35% by weight of ⁇ - Resins, an ash former content of less than 0.2% by weight, preferably less than 0.1% by weight, and a Na content of less than 50 ppm, preferably less than 20 ppm, in solution, obtainable by filtration of a coal tar pitch with 1 to 2.5 times the amount of one inorganic or organic filter aid, based on the Ql content of the pitch, is mixed by means of filter candles with a gap width of 50 to 500 ⁇ m at a temperature of 250 to 300 ° C under a pressure of up to 8 bar and optionally by distilling off Pitch fractions from the filtered pitch to set the softening point.
  • a softening point Kraemer-Sarnow
  • QI quinoline-in
  • Diatomaceous earth (diatomaceous earth), volcanic ash or the like can be used as inorganic filter aids.
  • Organic filter aids are activated carbon, charcoal, peat coke, brown coal coke and the like.
  • the grain size of these filter aids corresponds to 0.2 to 3 times the gap width of the filter.
  • the reactivity of the anodes produced with the pitch according to the invention is reduced not only in the case of Söderberg anodes, but even in the case of prebaked block anodes which contain up to 30% by weight of anode residues, based on the solids content, with a sodium content of more than 1500 ppm.
  • the strength, measured as flexural strength, of the anodes does not differ from that of conventional anodes, at least in the range of the usual mixing ratios when using the binder according to the invention, even though the burning losses are higher with the same binder content and thus the apparent density is usually lower than with anodes with known binders.
  • Example 1 The advantages of the pitch according to the invention result from a comparison with Example 2, in which a common electrode pitch is used.
  • the filtrate pitch is characterized by the following analysis data:
  • a mixture of 86 parts by weight of petroleum coke and 14 parts by weight of anode residues is mixed with this pitch.
  • Four mixtures with 14, 16, 18 and 20 wt .-% binder are formed into block anodes and burned in a known manner. The burning losses are shown in FIG. 1 and the properties of the anodes in FIGS. 2 to 7.
  • anode mixtures with 14, 16, 18 and 20% by weight of a conventional electrode binder made from coal tar are produced from the same solid mixture as in Example 1.
  • the electrode pitch is characterized by the following analysis data:
  • Example 1 The results of the investigations on the anodes are compared with those from Example 1 in FIGS. 1-7.
  • the measuring points of Example 1 are represented by a + sign and those of Example 2 by an A sign. 1 shows the higher burning losses when using the pitch according to the invention as a binder. However, this only affects the apparent density (Fig. 2) if the binder content is over 16%. This point is also the optimum density for the anodes produced with the pitch according to the invention.
  • the optimum for the comparison anodes is 18%.
  • the specific electrical resistance (Fig. 3) is the same for both types of anodes. This also applies approximately to the bending strength (Fig. 4). The influence of the different density is not noticeable here either.
  • the Na content (FIG. 5) of the anodes with the binder according to the invention is only slightly lower.
  • the reactivity, measured as total loss - burnup and sanding - after 7 hours at 960 ° C. in CO 2, is however greater for the anode with the normal binder pitch by about 3% by weight, based on the anode mass.
  • anodes which are produced with the pitch according to the invention as a binder have the same strength and the same specific electrical resistance as known anodes, but have a 3% lower burn-off. This lower burn-off is already achieved with about 16% by weight of binder.
  • speed of the anodes could also save about 11% of the binder and be replaced by the much cheaper petroleum coke.
  • This unexpected behavior of the binder according to the invention is possibly due to an improved wetting behavior compared to petroleum coke.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Electrolytic Production Of Metals (AREA)
  • Working-Up Tar And Pitch (AREA)
  • Paints Or Removers (AREA)
EP86107033A 1985-09-17 1986-05-23 Elektrodenbindemittel Expired EP0215192B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19853533106 DE3533106A1 (de) 1985-09-17 1985-09-17 Elektrodenbindemittel
DE3533106 1985-09-17

Publications (2)

Publication Number Publication Date
EP0215192A1 EP0215192A1 (de) 1987-03-25
EP0215192B1 true EP0215192B1 (de) 1989-08-16

Family

ID=6281162

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86107033A Expired EP0215192B1 (de) 1985-09-17 1986-05-23 Elektrodenbindemittel

Country Status (4)

Country Link
EP (1) EP0215192B1 (no)
DE (2) DE3533106A1 (no)
DK (1) DK163880C (no)
NO (1) NO170813C (no)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3702720A1 (de) * 1987-01-30 1988-08-11 Bergwerksverband Gmbh Pechmaterial aus kohleteerpech, verfahren zu dessen herstellung sowie verwendung des pechmaterials
DE8900473U1 (de) * 1989-01-17 1990-05-23 Hoogovens Aluminium Hüttenwerk GmbH, 4223 Voerde Schutzmantel für Stromzuführungselemente
AT395316B (de) * 1991-03-14 1992-11-25 Voest Alpine Stahl Linz Steinkohlenteerpech
CN107883897A (zh) * 2017-11-20 2018-04-06 甘肃烟草工业有限责任公司 一种空管复合滤棒空管段的检测方法

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1189517B (de) * 1957-04-03 1965-03-25 Verkaufsvereinigung Fuer Teere Verfahren zur Herstellung eines Spezialkokses aus Steinkohlenteerprodukten

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2683107A (en) * 1951-10-05 1954-07-06 Great Lakes Carbon Corp Manufacture of pitch
DE2706938A1 (de) * 1977-02-18 1978-08-24 Bergwerksverband Gmbh Verfahren zum filtrieren von teeren, pechen, extrakten oder oelen, aus kohlen
DE3005246A1 (de) * 1980-02-13 1981-08-20 Bergwerksverband Gmbh, 4300 Essen Verfahren zur herstellung eines filterhilfsmittels
DE3305431A1 (de) * 1983-02-17 1984-08-23 Bergwerksverband Gmbh, 4300 Essen Verfahren zur reinigung von hochfeststoffhaltigen kokereiteeren
US4436615A (en) * 1983-05-09 1984-03-13 United States Steel Corporation Process for removing solids from coal tar

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1189517B (de) * 1957-04-03 1965-03-25 Verkaufsvereinigung Fuer Teere Verfahren zur Herstellung eines Spezialkokses aus Steinkohlenteerprodukten

Also Published As

Publication number Publication date
DK443386A (da) 1987-03-18
DE3533106A1 (de) 1987-03-26
NO863700D0 (no) 1986-09-16
NO863700L (no) 1987-03-18
DK163880C (da) 1992-09-14
DE3665071D1 (en) 1989-09-21
DK163880B (da) 1992-04-13
EP0215192A1 (de) 1987-03-25
DK443386D0 (da) 1986-09-16
NO170813B (no) 1992-08-31
NO170813C (no) 1992-12-09

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