EP0215192B1 - Electrode binder - Google Patents
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- 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
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- 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.
Description
Die Erfindung betrifft ein Elektrodenbindemittel aus Steinkohlenteer zur Herstellung von Kohlenstoffformkörpern, wie sie beispielsweise bei der Aluminiumgewinnung verwendet werden.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.
Eine Kohlenstoffanode für die Aluminiumgewinnung sollte eine hohe Festigkeit, eine geringe Porosität, einen niedrigen elektrischen Widerstand und einen möglichst geringen Abbrand aufweisen. Diese Eigenschaften werden ganz entscheidend von dem verwendeten Bindemittel beeinflußt. Es wird charakterisiert durch seinen Erweichungspunkt, den Verkokungsrückstand und den Gehalten an unlöslichen Anteilen in Chinolin und Toluol, an Aschebildnern und Schwefel. Häufig werden auch noch die Dichte und der Destillationsverlauf zur Spezifikation herangezogen. Als Bindemittel werden fast ausschließlich Steinkohlenteerpeche wegen ihres günstigen Verkokungsverhaltens verwendet. Sie haben folgende Spezifikationsdaten (Ullmanns Encyklopädie der technischen Chemie, 4. Auflage, Band 22, Seite 423):
Die ß-Harze beeinflussen insbesondere das Back- und Bindevermögen, und der QI-Gehalt erhöht die Festigkeit des Bindemittelkokses. Aschebildner sind unerwünscht, da sie zur Verunreinigung des Aluminiums beitragen.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.
Ziel der Aluminiumhütten ist die Entwicklung einer Anode hoher Leitfähigkeit mit geringem Abbrand, um die Betriebskosten zu senken. Nur ein Teil des verbrauchten Kohlenstoffs wird für Reduktion des Aluminiumerzes genutzt, ein anderer Teil geht durch Nebenreaktionen, z.B. Umwandlung von Kohlendioxid in Kohlenmonoxid, und durch "Absanden" der Anode verloren. Das "Absanden" entsteht durch einen schnelleren Verbrauch des Binde mittelkokses gegenüber dem Petrolkoks, wobei sich das Füllerkokskorn aus dem Verbund löst und in das Bad fällt.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.
Der Einfluß der Aschebildner auf die Reaktivität des Anodenkohlenstoffs und damit auf den Anodenverbrauch wurde in letzter Zeit eingehend untersucht. Dabei wurden vor allem die Einflüsse von Natrium und Eisen untersucht (Petersen: Effect of sodium content of pitch on selective oxidation on baked blends of pitch/fines / Light Metals, 1981, Seiten 471 - 476). Es wurde festgestellt, daß weder die Porosität bei der nur geringen Streubreite noch der Eisengehalt bei einer selektiven Oxidation bei 950°C in Kohlendioxid mit dem Abbrand eines aus Pech und Kokspulver hergestellten, gebrannten dichten Kohlenstofformkörpers korrelieren. Allein beim Natrium zeigte sich eine Abhängigkeit des Abbrandes und des "Absandens" von dessen Konzentration im Pech. Die Übertragbarkeit dieser Ergebnisse auf industriell hergestellte Anoden ist wegen der anderen Granulometrie und des geringeren Binderanteils nicht gesichert, zumal auch die Luftpermeabilität zu berücksichtigen ist. Vor allem bei vorgebrannten Blockanoden, in deren Masse Na-reiche Anodenreste enthalten sind, ist mit abweichenden Ergebnissen zu rechnen.The influence of ash formers on the reactivity of the anode carbon and thus on the anode consumption has recently been investigated in detail. The effects of sodium and iron were examined in particular (Petersen: Effect of sodium content of pitch on selective oxidation on baked blends of pitch / fines / Light Metals, 1981, pages 471 - 476). It was found that neither the porosity with the only small scattering range nor the iron content with a selective oxidation at 950 ° C. in carbon dioxide correlate with the burnup of a fired, dense carbon molded body produced from pitch and coke powder. In the case of sodium alone, there was a dependence of the burnup and the "sanding" on its concentration in the pitch. The transferability of these results to industrially manufactured anodes cannot be guaranteed due to the different granulometry and the lower proportion of binder, especially since air permeability must also be taken into account. Especially with pre-burned block anodes, which contain Na-rich anode residues, different results can be expected.
Steinkohlenteere enthalten als Rohteere bereits Natrium. Der Na-Gehalt wird durch die übliche Neutralisation der sauren Chlorid-lonen zur Minderung der Korrosion in den Destillationsanlagen weiter erhöht. Im Pech sind die Aschebildner und somit auch das Natrium aufkonzentriert, so daß die Elektrodenbindemittel normalerweise etwa 500 bis 1500 ppm Natrium enthalten.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.
Es ist zwar bekannt, daß die Aschebildner durch geeignete Trennverfahren wie Zentrifugieren, Separieren, Filtrieren und promotorbeschleunigtes Absitzenlassen aus Teeren und Pechen entfernt werden können. Bei diesen Verfahren wird aber das für die Anodenfestigkeit erforderliche Chinolinunlösliche ebenfalls abgeschieden.It is known that 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.
Es bestand daher die Aufgabe, ein Elektrodenbindemittel auf Steinkohlenteerbasis zu entwickeln, mit dem Anoden hoher Festigkeit, geringem elektrischen Widerstand und niedriger Luft-Permeabilität hergestellt werden können, die einen verminderten 002-Abbrand und ein weniger starkes "Absanden" zeigen.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".
Die Aufgabe wird erfindungsgemäß durch ein Steinkohlenteerpech mit einem Erweichungspunkt (Kraemer-Sarnow) von 90 bis 105°C, einem Gehalt an Chinolinunlöslichem (QI)/ von 0,5 bis 5 Gew.-%, 25 bis 35 Gew.-% β-Harzen, einem Gehalt an Aschebildnern von weniger als 0,2 Gew.-%, vorzugsweise weniger als 0,1 Gew.-%, und einem Na-Gehalt von weniger als 50 ppm, vorzugsweise weniger als 20 ppm, gelöst, erhältlich durch Filtration eines Steinkohlenteerpeches, das mit der 1-bis 2,5-fache Menge eines anorganischen oder organischen Filterhilfsmittels, bezogen auf den Ql-Gehait des Peches, vermischt wird, mittels Filterkerzen mit einer Spaltweite von 50 bis 500 µm bei einer Tempe ratur von 250 bis 300°C unter einem Druck von bis zu 8 bar und gegebenenfalls durch Abdestillieren von Pechfraktionen aus dem filtrierten Pech zur Einstellung des Erweichungspunktes.According to the invention, 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 β- 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 µm 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.
Als anorganische Filterhilfsmittel können Kieselgur (Diatomeenerde), Vulkanasche oder ähnliches verwendet werden. Organische Filterhilfsmittel sind Aktivkohle, Holzkohle, Torfkoks, Braunkohlenkoks und ähnliches. Die Korngröße dieser Filterhilfsmittel entspricht dem 0,2- bis 3-fachen der Spaltweite des Filters.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.
Die Reaktivität der mit dem erfindungsgemäßen Pech hergestellten Anoden vermindert sich nicht nur bei Söderberg-Anoden, sondern sogar bei vorgebrannten Blockanoden, die bis zu 30 Gew.-% Anodenreste, bezogen auf den Feststoffanteil, mit einem Natriumgehalt von über 1500 ppm enthalten. Dies war aufgrund der bekannten Veröffentlichungen nicht zu erwarten, da sich der Na-Gehalt der Blockanoden nur wenig durch das Bindemittel beeinflussen läßt und je nach Anteil und Reinigungsgrad der Anodenreste ("Butts") bei etwa 350 (14 % Butts) bzw. 900 ppm (20 % Butts) liegt. Über die katalytische Wirkung des Natriums auf die C02-Reaktivität des Kokses läßt sich dieses Verhalten nicht erklären.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. This was not to be expected on the basis of the known publications, since the Na content of the block anodes can be influenced only slightly by the binder and, depending on the proportion and degree of purification of the anode residues ("butts"), is approximately 350 (14% butts) or 900 ppm (20% butts). This behavior cannot be explained by the catalytic effect of sodium on the C0 2 reactivity of the coke.
Überraschend ist außerdem, daß die Festigkeit, gemessen als Biegefestigkeit, der Anoden sich zumindest in dem Bereich der üblichen Mischungsverhältnisse bei Verwendung des erfindungsgemäßen Bindemittels nicht von der üblicher Anoden unterscheidet, dies, obwohl die Brennverluste bei gleichem Bindemittelgehalt höher und damit die scheinbare Dichte meist geringer ist als bei Anoden mit bekannten Bindemitteln.It is also surprising that 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.
Die Erfindung wird anhand des Beispiels 1 näher erläutert. Aus dem Vergleich mit dem Beispiel 2, in dem ein gebräuchliches Elektrodenpech verwendet wird, ergeben sich die Vorzüge des erfindungsgemäßen Pechs.The invention is explained in more detail using 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.
100 Gew.-Teile eines Steinkohlenteernormalpechs folgender Beschaffenheit:
Von dem Filtratpech werden 12 Gew.-% Öle bei einem Druck von 100 mbar abdestilliert. Als Rückstand wird ein Pech mit folgenden Kenndaten erhalten:
Ein Gemisch aus 86 Gew.-Teilen Petrolkoks und 14 Gew.-Teilen Anodenreste wird mit diesem Pech gemischt. Vier Gemische mit 14, 16, 18 und 20 Gew.-% Bindemittel werden in bekannter Weise zu Blockanoden geformt und gebrannt. Die Brennverluste sind in Fig.1 und die Eigenschaften der Anoden in den Fig. 2 bis 7 dargestellt.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.
Zum Vergleich werden aus dem gleichen Feststoffgemisch wie in Beispiel 1 Anodenmischungen mit 14, 16, 18 und 20 Gew.-% eines üblichen Elektrodenbindemittels aus Steinkohlenteer hergestellt. Das Elektrodenpech ist durch folgende Analysendaten charakterisiert:
Die Ergebnisse der Untersuchungen an den Anoden sind in den Fig. 1 - 7 denen aus dem Beispiel 1 gegenübergestellt. Die Meßpunkte des Beispiels 1 sind durch ein +-Zeichen und die des Beispiels 2 durch ein A-Zeichen dargestellt. Aus Fig. 1 ergeben sich die höheren Brennverluste bei der Verwendung des erfindungsgemäßen Pechs als Bindemittel. Auf die scheinbare Dichte (Fig.2) wirkt sich dies allerdings erst bei Bindemittelgehalten über 16 % aus. Dieser Punkt ist zugleich das Dichteoptimum für die mit dem erfindungsgemäßen Pech hergestellten Anoden. Bei den Vergleichsanoden liegt das Optimum bei 18 %. Der spezifische elektrische Widerstand (Fig. 3) ist bei beiden Anodentypen gleich. Das gilt angenähert auch für die Biegefestigkeit (Fig. 4). Der Einfluß der unterschiedlichen Dichte ist auch hier nicht spürbar.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.
Der Na-Gehalt (Fig. 5) der Anoden mit dem erfindungsgemäßen Bindemittel ist nur geringfügig niedriger. Die Reaktivität, gemessen als Gesamtverlust- Abbrand und Absanden- nach 7 h bei 960°C in COz, ist jedoch bei der Anode mit dem normalen Binderpech um etwa 3 Gew.-%, bezogen auf die Anodenmasse, größer.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
Ein weiterer Vorteil im Hinblick auf einen geringen Anodenverbrauch ist die geringe Luft-Permeabilität (Fig.7) der Anode bei 20 °C mit dem erfindungsgemäßen Bindemittel. Die Permeabilität wird in nPerm (nPm) gemessen (1 Pm bedeutet einen Gasdurchfluss von 1 cm3/s durch eine 1 cm2 große Fläche eines 1 cm dicken Probekörpers bei einem Druckverlust von 1 dyn/cm2 bei einer Viskosität des Gases von 0,1 Pa s). Die Abhängigkeit des Minderverbrauchs an Anodenmaterial ergibt sich nach Keller und Fischer ("Development of Anode Quality Criteria by Statistical Evaluation of Operational Results in the Electrolysis", Light Metals, 1982, Seiten 729 - 740) zu:
- ANC = 9,3 - A AP - 3,7 A RR.
- ANC ist dabei der Minderverbrauch an Anodenmaterial in g Kohlenstoff je kg Aluminium, AAP kennzeichnet die Differenz der Luft-Permeabilität in nPm und A RR die des Reaktivitätsrestes in Gew.-% (eingesetzter Kohlenstoff-Gesamtverlust, bezogen auf den eingesetzten Kohlenstoff). Das Minium der Luft-Permeabilität liegt bei dem erfindungsgemäßen Bindemittel bei einem Bindemittelgehalt von etwa 16 %, bei der Vergleichsanode bei einem von etwa 18 %.
- A NC = 9.3 - A AP - 3.7 A RR.
- A NC is the reduced consumption of anode material in g of carbon per kg of aluminum, A AP denotes the difference in air permeability in nPm and A RR that of the residual reactivity in% by weight (total loss of carbon used, based on the carbon used). The minimum of air permeability is approximately 16% for the binder according to the invention and approximately 18% for the comparative anode.
Zusammenfassend kann also festgestellt werden, daß Anoden, die mit dem erfindungsgemäßen Pech als Bindemittel hergestellt werden, die gleiche Festigkeit und den gleichen spezifischen elektrischen Widerstand haben wie bekannte Anoden, aber einen um 3 % geringeren Abbrand aufweisen. Dieser geringere Abbrand wird bereits bei etwa 16 Gew.-% Bindemittel erreicht. Bei Inkaufnahme einer geringfügigen Erhöhung des elektrischen Widerstandes und einer für Blockanoden vertretbaren Abnahme der Festigkeit der Anoden könnten außerdem etwa 11 % des Bindemittels eingespart und durch den wesentlich billigeren Petrolkoks ersetzt werden. Dieses unerwartete Verhalten des erfindungsgemäßen Bindemittels ist möglicherweise auf ein verbessertes Benetzungsverhalten gegenüber Petrolkoks zurückzuführen.In summary, it can be stated that 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. When accepting a slight increase in electrical resistance and a decrease in the Festig acceptable for block anodes 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.
Claims (1)
- The use of an electrode binder of coal tar with a softening point (Kraemer-Sarnow) of from 90 to 105°C, a content of quinoline-insolubles (QI) of from 0.5 to 5% by weight, from 25 to 35% by weight of p-resins, a content of ash formers of less than 0.2% by weight, preferably less than 0.1% by weight, and an Na content of less than 50 ppm, preferably less than 20 ppm, obtainable by the filtration of a coaltar pitch which is mixed with a 1- to 2.5-fold quantity of an inorganic or organic filter aid, relative to the Ql content of the pitch, by means of filter cartridges with a pore size of from 50 to 100 µm at a temperature of from 250 to 300°C at a pressure of up to 8 bar and where appropriate by distilling off oils from the filtered pitch in order to fix the softening point, as a binder in the manufacture of anodes with reduced burn-off for the aluminium industry, in particular in the manufacture of previously burned block anodes with an addition of up to 30% by weight of anode residues, relative to the solid-material portion of the anode material, with an Na content of more than 1500 ppm.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3533106 | 1985-09-17 | ||
| DE19853533106 DE3533106A1 (en) | 1985-09-17 | 1985-09-17 | ELECTRODE BINDING AGENT |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0215192A1 EP0215192A1 (en) | 1987-03-25 |
| EP0215192B1 true EP0215192B1 (en) | 1989-08-16 |
Family
ID=6281162
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP86107033A Expired EP0215192B1 (en) | 1985-09-17 | 1986-05-23 | Electrode binder |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0215192B1 (en) |
| DE (2) | DE3533106A1 (en) |
| DK (1) | DK163880C (en) |
| NO (1) | NO170813C (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3702720A1 (en) * | 1987-01-30 | 1988-08-11 | Bergwerksverband Gmbh | CARBONED PECH MATERIAL, METHOD FOR THE PRODUCTION THEREOF AND USE OF THE PECH MATERIAL |
| DE8900473U1 (en) * | 1989-01-17 | 1990-05-23 | Hoogovens Aluminium Huettenwerk Gmbh, 4223 Voerde, De | |
| AT395316B (en) * | 1991-03-14 | 1992-11-25 | Voest Alpine Stahl Linz | Hard-coal tar pitch |
| CN107883897A (en) * | 2017-11-20 | 2018-04-06 | 甘肃烟草工业有限责任公司 | A kind of detection method of blank pipe composite filter blank pipe section |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1189517B (en) * | 1957-04-03 | 1965-03-25 | Verkaufsvereinigung Fuer Teere | Process for the production of a special coke from coal tar products |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2683107A (en) * | 1951-10-05 | 1954-07-06 | Great Lakes Carbon Corp | Manufacture of pitch |
| DE2706938A1 (en) * | 1977-02-18 | 1978-08-24 | Bergwerksverband Gmbh | PROCESS FOR FILTRATING TARS, PECHING, EXTRACTS OR OILS, FROM COALS |
| DE3005246A1 (en) * | 1980-02-13 | 1981-08-20 | Bergwerksverband Gmbh, 4300 Essen | METHOD FOR PRODUCING A FILTER AUXILIARY |
| DE3305431A1 (en) * | 1983-02-17 | 1984-08-23 | Bergwerksverband Gmbh, 4300 Essen | METHOD FOR CLEANING HIGH-SOLID COOKER TARS |
| US4436615A (en) * | 1983-05-09 | 1984-03-13 | United States Steel Corporation | Process for removing solids from coal tar |
-
1985
- 1985-09-17 DE DE19853533106 patent/DE3533106A1/en not_active Withdrawn
-
1986
- 1986-05-23 DE DE8686107033T patent/DE3665071D1/en not_active Expired
- 1986-05-23 EP EP86107033A patent/EP0215192B1/en not_active Expired
- 1986-09-16 NO NO863700A patent/NO170813C/en not_active IP Right Cessation
- 1986-09-16 DK DK443386A patent/DK163880C/en not_active IP Right Cessation
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1189517B (en) * | 1957-04-03 | 1965-03-25 | Verkaufsvereinigung Fuer Teere | Process for the production of a special coke from coal tar products |
Also Published As
| Publication number | Publication date |
|---|---|
| DE3665071D1 (en) | 1989-09-21 |
| DK163880B (en) | 1992-04-13 |
| DK443386D0 (en) | 1986-09-16 |
| DK163880C (en) | 1992-09-14 |
| DE3533106A1 (en) | 1987-03-26 |
| DK443386A (en) | 1987-03-18 |
| NO863700D0 (en) | 1986-09-16 |
| NO170813C (en) | 1992-12-09 |
| NO170813B (en) | 1992-08-31 |
| EP0215192A1 (en) | 1987-03-25 |
| NO863700L (en) | 1987-03-18 |
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