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EP1789363B1 - Method for preparing a carbon siccative for producing electrodes - Google Patents

Method for preparing a carbon siccative for producing electrodes Download PDF

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Publication number
EP1789363B1
EP1789363B1 EP04764756A EP04764756A EP1789363B1 EP 1789363 B1 EP1789363 B1 EP 1789363B1 EP 04764756 A EP04764756 A EP 04764756A EP 04764756 A EP04764756 A EP 04764756A EP 1789363 B1 EP1789363 B1 EP 1789363B1
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EP
European Patent Office
Prior art keywords
mill
sifter
adjusted
grinding
dust
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.)
Revoked
Application number
EP04764756A
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German (de)
French (fr)
Other versions
EP1789363A1 (en
Inventor
Jens-Peter Thiel
Thore MÖLLER
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Claudius Peters Projects GmbH
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Claudius Peters Technologies GmbH
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Filing date
Publication date
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Application filed by Claudius Peters Technologies GmbH filed Critical Claudius Peters Technologies GmbH
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C15/00—Disintegrating by milling members in the form of rollers or balls co-operating with rings or discs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B11/00—Arrangement of accessories in apparatus for separating solids from solids using gas currents
    • B07B11/04—Control arrangements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B7/00—Selective separation of solid materials carried by, or dispersed in, gas currents
    • B07B7/08—Selective separation of solid materials carried by, or dispersed in, gas currents using centrifugal force
    • B07B7/083—Selective separation of solid materials carried by, or dispersed in, gas currents using centrifugal force generated by rotating vanes, discs, drums, or brushes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C15/00—Disintegrating by milling members in the form of rollers or balls co-operating with rings or discs
    • B02C2015/002—Disintegrating by milling members in the form of rollers or balls co-operating with rings or discs combined with a classifier

Definitions

  • Electrodes which are mainly used for electro-metallurgical processes, are produced by pressing granular carbon masses (dry matter) with the addition of pitch as binder.
  • the electrode quality depends crucially on the fact that a predetermined particle size spectrum is maintained in the dry matter.
  • Coarse grain, medium grain and fine grain must be present in certain proportions depending on the type of electrode and the raw material. Of particular importance is the adherence to a given quality of the fine material.
  • the mean grain size is usually at 30 to 60 microns corresponding to a specific surface of 5000 to 2000 cm 2 / g.
  • the invention is therefore based on the object to provide a method which is easier to influence with regard to the achievement of certain properties of the dust-like or fine-grained target fraction.
  • the solution according to the invention consists in that, for grinding the dust fraction, use is made of a mill-classifier combination with grain size which can be continuously adjusted during operation.
  • a roller mill with integrated classifier in which the grinding pressure and preferably the mill speed and the air throughput through the mill and the classifier are adjustable, has proven particularly useful.
  • a dynamic classifier is preferably used, in which for the purpose of adjusting the grain boundaries, the speed should be adjustable.
  • a mill-sifter combination is understood to mean such a functional connection of a mill with a sifter in which the oversized grain separated from the sifter is returned to the mill.
  • This combination allows a particularly fine setting without significant dead-mark, because both the properties of the classifier and those of the mill can be influenced. This achieves the continuous production of predetermined amounts of dust of arbitrary fineness with different grindability by adjusting the speed, the contact pressure, the system air quantity and / or the classifier speed.
  • the grinding pressure can be adjusted. Since petroleum coke, which is mostly used as a raw material, is unusually hard, the grinding pressure is set two to three times as high as conventional coal grinding.
  • the amount of system air that is, the amount of air flow that carries the refined fines from the refining zone to the sifter, can be reduced if lower maximum grain size is desired, and vice versa.
  • the maximum grain size can also be influenced by the speed of the dynamic classifier. Depending on the type of classifier, further parameters may be added to influence the grain size.
  • the sifter is preferably a known dynamic type in which the air flow of the mill loaded with milled material is guided from the outside to the inside through a ring of tangentially arranged guide vanes and is thereby set in circular motion. Farther inside, it reaches a rotating basket on a spiral track, which is operated at an adjustable speed. The fine particles penetrate the columns of the rotary basket with the air flow, while the coarser are thrown back outward to sink in the space between the guide vanes and rotating basket down and then fed back to the grinding process. The fines leave the sifter with the air flow, whereby its fineness can be determined by the setting of the rotary basket speed and the strength of the air flow.
  • the fines thus obtained and continuously removed from the air flow in a known manner no longer require any subsequent homogenization. It can be continuously fed directly to a silo, from which it is taken directly or indirectly, preferably continuously for use.
  • This silo can also be dimensioned smaller than previously customary, because no mill changeover takes into account quality change Need to become. Even if parameters of the grinding or visual process have to be adjusted due to quality changes of the raw material or changes in the recipe, the mill-sifter combination can be continuously operated. If a fundamental recipe change is necessary, the conversion can be done in a few minutes.
  • the product which may be obtained in the conversion phase and does not correspond to the target quality can temporarily be intermediate-silicated and subsequently returned to the mill.
  • the continuous operation is thereby practically not interrupted.
  • the switching process is preferably computer-controlled, with programmed overrides being used to avoid or minimize the accumulation of intermediate product (Abmahlmann).
  • the approximately as Abmahlmann resulting product is collected in an intermediate silo and the feedstock preferably computer-controlled mixed so that no polluting product waste.
  • roller mills ball ring mills, roller table mills, roller mills and single-roller mills
  • All grindable carbon carriers up to the hardest petroleum cokes can be processed.
  • the driers can be prepared for all types of electrodes with different hardness and fineness requirements.
  • the bandwidth of the producible grains is very large. It is preferably in the range of 1,000 to 10,000 cm 2 / g.
  • the essential advantage of the invention is that the grinding process can be switched on continuously and at the same time in the production process. Since the ensiling is partly avoided, partly facilitated and in particular large silos are avoided, the hitherto often extremely disturbing problem of segregation of different grain within the silos is avoided.

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Carbon And Carbon Compounds (AREA)
  • Disintegrating Or Milling (AREA)
  • Crushing And Grinding (AREA)

Description

Elektroden, die vornehmlich für elektro-metallurgische Prozesse verwendet werden, werden durch Verpressen von körnigen Kohlenstoffmassen (Trockenstoff) unter Zusatz von Pech als Bindemittel hergestellt. Die Elektrodenqualität hängt entscheidend davon ab, daß im Trockenstoff ein vorbestimmtes Korngrößenspektrum eingehalten wird. Grobkorn, Mittelkorn und Feinkorn müssen je nach Art der Elektrode und des Rohstoffs in bestimmten Verhältnismengen darin vertreten sein. Von besonderer Bedeutung ist dabei die Einhaltung einer vorgegebenen Qualität des Feinguts. Darunter fällt im Zusammenhang der Erfindung hauptsächlich der sogenannte Staubanteil, dessen mittlere Korngröße in der Regel bei 30 bis 60 µm entsprechend einer spezifischen Oberfläche von 5000 bis 2000 cm2/g liegt.Electrodes, which are mainly used for electro-metallurgical processes, are produced by pressing granular carbon masses (dry matter) with the addition of pitch as binder. The electrode quality depends crucially on the fact that a predetermined particle size spectrum is maintained in the dry matter. Coarse grain, medium grain and fine grain must be present in certain proportions depending on the type of electrode and the raw material. Of particular importance is the adherence to a given quality of the fine material. Including in the context of the invention mainly the so-called dust content, the mean grain size is usually at 30 to 60 microns corresponding to a specific surface of 5000 to 2000 cm 2 / g.

Bei bekannten Herstellungsverfahren ( DE-A-4122062 ) werden die einzelnen Fraktionen gebrochen bzw. gemahlen und schließlich klassiert und in gesonderten Dosiersilos abgelegt, um daraus nach der jeweiligen Rezeptur in einem gewünschtem Verhältnis abgezogen zu werden. Die Staubfraktion wird gesondert in einer Rohrmühle (Kugelmühle) gemahlen und homogenisiert, bevor sie gleichfalls in Dosiersilos abgelegt wird. Dieses Verfahren hat den Nachteil, daß es nur sehr schwerfällig verändert werden kann, wenn eine Rezepturänderung oder Schwankungen in der Qualität des Rohmaterials eine Anpassung verlangen. Bei der Einstellung der Staubeigenschaften in Abhängigkeit von der Mahlbarkeit des Kokses und den jeweiligen wechselnden Anforderungen wird das bekannte Verfahren im Start/Stop-Betrieb durchgeführt, was zu unregelmäßiger Staubqualität hinsichtlich des Durchsatzes, der Feinheit und der spezifischen Oberfläche führt. Dies hat unterschiedlichen Pechbedarf und unerwünscht schwankende physikalische Eigenschaften der Elektroden zur Folge.In known production methods ( DE-A-4122062 ), the individual fractions are broken or ground and finally classified and stored in separate dosing silos, to be deducted from the respective recipe in a desired ratio. The dust fraction is separately ground in a tube mill (ball mill) and homogenized before it is also stored in dosing silos. This method has the disadvantage that it can be changed only very cumbersome, if a formulation change or variations in the quality of the raw material require an adjustment. When adjusting the dust properties depending on the grindability of the coke and the respective changing requirements the known method is carried out in start / stop operation, resulting in irregular dust quality in terms of throughput, fineness and specific surface area. This results in different pitch requirements and undesirably fluctuating physical properties of the electrodes.

Der Erfindung liegt daher die Aufgabe zugrunde, ein Verfahren zu schaffen, das im Hinblick auf die Erreichung bestimmter Eigenschaften der staubförmigen bzw. feinkörnigen Zielfraktion leichter beeinflußbar ist.The invention is therefore based on the object to provide a method which is easier to influence with regard to the achievement of certain properties of the dust-like or fine-grained target fraction.

Die erfindungsgemäße Lösung besteht darin, daß zum Mahlen der Staubfraktion eine Mühle-Sichter-Kombination mit während des Betriebs kontinuierlich verstellbarer Korngröße verwendet wird. Besonders bewährt hat sich die Verwendung einer Wälzmühle mit integriertem Sichter, bei der der Mahldruck und vorzugsweise die Mühlendrehzahl und der Luftdurchsatz durch die Mühle und den Sichter verstellbar sind. Als Sichter wird vorzugsweise ein dynamischer Sichter verwendet, bei dem zum Zwecke der Verstellung der Korngrenzen die Drehzahl verstellbar sein sollte.The solution according to the invention consists in that, for grinding the dust fraction, use is made of a mill-classifier combination with grain size which can be continuously adjusted during operation. The use of a roller mill with integrated classifier, in which the grinding pressure and preferably the mill speed and the air throughput through the mill and the classifier are adjustable, has proven particularly useful. As a classifier, a dynamic classifier is preferably used, in which for the purpose of adjusting the grain boundaries, the speed should be adjustable.

Unter einer Mühle-Sichter-Kombination wird eine solche Funktionsverbindung einer Mühle mit einem Sichter verstanden, bei der das vom Sichter ausgesonderte Überkorn in die Mühle zurückgeführt wird. Diese Kombination erlaubt eine besonders feine Einstellung ohne wesentliche Totzeichen, weil sowohl auf die Eigenschaften des Sichters als auch auf diejenigen der Mühle Einfluß genommen werden kann. Man erreicht damit die kontinuierliche Herstellung vorgegebener Staubmengen beliebiger Feinheiten bei unterschiedlicher Mahlbarkeit durch Anpassung der Drehzahl, des Anpreßdrucks, der Systemluftmenge und/oder der Sichterdrehzahl.A mill-sifter combination is understood to mean such a functional connection of a mill with a sifter in which the oversized grain separated from the sifter is returned to the mill. This combination allows a particularly fine setting without significant dead-mark, because both the properties of the classifier and those of the mill can be influenced. This achieves the continuous production of predetermined amounts of dust of arbitrary fineness with different grindability by adjusting the speed, the contact pressure, the system air quantity and / or the classifier speed.

Zur Berücksichtigung unterschiedlicher Härten des Rohguts kann der Mahldruck verstellt werden. Da der als Rohmaterial größtenteils verwendete Petrolkoks ungewöhnlich hart ist, wird der Mahldruck zwei- bis dreimal so hoch eingestellt wie bei üblicher Kohlemahlung. Die Systemluftmenge, d.h. die Stärke des Luftstroms, der das ermahlene Feingut aus der Mahlzone emporträgt zum Sichter, kann geringer eingestellt werden, wenn geringere maximale Korngröße gewünscht wird, und umgekehrt. Die maximale Korngröße kann auch durch die Drehzahl des dynamischen Sichters beeinflußt werden. Je nach Typ des Sichters können weitere Parameter zur Beeinflussung der Korngröße hinzutreten.To take account of different hardnesses of the raw material, the grinding pressure can be adjusted. Since petroleum coke, which is mostly used as a raw material, is unusually hard, the grinding pressure is set two to three times as high as conventional coal grinding. The amount of system air, that is, the amount of air flow that carries the refined fines from the refining zone to the sifter, can be reduced if lower maximum grain size is desired, and vice versa. The maximum grain size can also be influenced by the speed of the dynamic classifier. Depending on the type of classifier, further parameters may be added to influence the grain size.

Bei dem Sichter handelt es sich vorzugsweise um einen bekannten dynamischen Typ, bei welchem der mit vermahlenem Gut beladene Luftstrom der Mühle von außen nach innen durch einen Ring von tangential angeordneten Leitschaufeln geführt und dadurch in Kreisbewegung versetzt wird. Weiter innen erreicht er auf einer Spiralbahn einen Drehkorb, der mit einer einstellbaren Drehzahl betrieben wird. Die feinen Partikeln durchdringen die Spalten des Drehkorbs mit dem Luftstrom, während die gröberen wieder nach außen geschleudert werden, um in dem Raum zwischen Leitschaufeln und Drehkorb nach unten zu sinken und von dort dem Mahlprozeß wieder zugeführt zu werden. Das Feingut verläßt den Sichter mit dem Luftstrom, wobei sich seine Feinheit über die Einstellung der Drehkorb-Drehzahl und die Stärke des Luftstroms bestimmen läßt.The sifter is preferably a known dynamic type in which the air flow of the mill loaded with milled material is guided from the outside to the inside through a ring of tangentially arranged guide vanes and is thereby set in circular motion. Farther inside, it reaches a rotating basket on a spiral track, which is operated at an adjustable speed. The fine particles penetrate the columns of the rotary basket with the air flow, while the coarser are thrown back outward to sink in the space between the guide vanes and rotating basket down and then fed back to the grinding process. The fines leave the sifter with the air flow, whereby its fineness can be determined by the setting of the rotary basket speed and the strength of the air flow.

Da auf Schwankungen in der Qualität des Rohmaterials rasch und kontinuierlich während des Betriebs reagiert werden kann und da der gewünschte Korngrößenbereich kontinuierlich genau eingehalten werden kann, bedarf das so gewonnene und dem Luftstrom in bekannter Weise kontinuierlich entnommene Feingut keiner nachträglichen Homogenisierung mehr. Es kann kontinuierlich unmittelbar einem Silo zugeführt werden, aus dem es unmittelbar oder mittelbar vorzugsweise kontinuierlich zur Verwendung entnommen wird. Dieses Silo kann auch kleiner als bisher üblich dimensioniert werden, weil keine Mühlenumstellzeiten bei Qualitätsänderung berücksichtigt werden müssen. Auch wenn Parameter des Mahl- oder Sichtvorgangs aufgrund von Qualitätsänderungen des Rohmaterials oder Änderungen der Rezeptur angepaßt werden müssen, kann die Mühle-Sichter-Kombination kontinuierlich weiterbetrieben werden. Falls eine grundlegende Rezepturänderung notwendig wird, kann die Umstellung in wenigen Minuten erfolgen. Das in der Umstellungsphase ggf. anfallende, der Zielqualität nicht entsprechende Produkt kann kurzzeitig zwischensiliert und anschließend der Mühle wieder zugeführt werden. Der kontinuierliche Betrieb wird dadurch praktisch nicht unterbrochen. Der Umschaltvorgang erfolgt vorzugsweise rechnergesteuert, wobei programmierte Übersteuerungen eingesetzt werden, um den Anfall an Zwischenprodukt (Abmahlverlust) zu vermeiden oder zu minimieren. Das etwa als Abmahlverlust anfallende Produkt wird in einem Zwischensilo aufgefangen und dem Aufgabegut vorzugsweise rechnergesteuert so beigemischt, daß keine umweltbelastenden Produktabfälle entstehen.Since fluctuations in the quality of the raw material can be reacted rapidly and continuously during operation, and since the desired particle size range can be continuously maintained precisely, the fines thus obtained and continuously removed from the air flow in a known manner no longer require any subsequent homogenization. It can be continuously fed directly to a silo, from which it is taken directly or indirectly, preferably continuously for use. This silo can also be dimensioned smaller than previously customary, because no mill changeover takes into account quality change Need to become. Even if parameters of the grinding or visual process have to be adjusted due to quality changes of the raw material or changes in the recipe, the mill-sifter combination can be continuously operated. If a fundamental recipe change is necessary, the conversion can be done in a few minutes. The product which may be obtained in the conversion phase and does not correspond to the target quality can temporarily be intermediate-silicated and subsequently returned to the mill. The continuous operation is thereby practically not interrupted. The switching process is preferably computer-controlled, with programmed overrides being used to avoid or minimize the accumulation of intermediate product (Abmahlverlust). The approximately as Abmahlverlust resulting product is collected in an intermediate silo and the feedstock preferably computer-controlled mixed so that no polluting product waste.

Alle Typen von Wälzmühlen (Kugelringmühlen, Walzentellermühlen, Walzenschüsselmühlen bis hin zu Einwalzenmühlen) können zum Einsatz kommen. Alle mahlbaren Kohlenstoffträger bis hin zu den härtesten Petrolkoksen können verarbeitet werden. Es können die Trockenstoffe für alle Typen von Elektroden mit unterschiedlichsten Anforderungen an Härte und Feinheit zubereitet werden. Die Bandbreite der erzeugbaren Körnungen ist sehr groß. Sie liegt vorzugsweise im Bereich von 1.000 bis 10.000 cm2/g.All types of roller mills (ball ring mills, roller table mills, roller mills and single-roller mills) can be used. All grindable carbon carriers up to the hardest petroleum cokes can be processed. The driers can be prepared for all types of electrodes with different hardness and fineness requirements. The bandwidth of the producible grains is very large. It is preferably in the range of 1,000 to 10,000 cm 2 / g.

Während es bislang erforderlich war, verschiedene Fraktionen zeitversetzt zu erzeugen und das Produkt in gesonderten Silos zwischen zu lagern, besteht der wesentliche Vorteil der Erfindung darin, daß der Mahlvorgang kontinuierlich und zeitgleich in den Produktionsvorgang eingeschaltet werden kann. Da die Silierung teils vermieden, teils erleichtert wird und insbesondere große Silos vermieden werden, wird das bisher häufig äußerst störende Problem der Segregation unterschiedlicher Körnung innerhalb der Silos vermieden.While it has hitherto been necessary to produce different fractions with a time delay and to store the product in separate silos between, the essential advantage of the invention is that the grinding process can be switched on continuously and at the same time in the production process. Since the ensiling is partly avoided, partly facilitated and in particular large silos are avoided, the hitherto often extremely disturbing problem of segregation of different grain within the silos is avoided.

Claims (8)

  1. A method for preparing a carbon siccative for producing electrodes, in which fractions of different granulation are produced and are mixed in a predetermined ratio, and in which the fractions comprise at least one dust-like to fine-grained fraction which is ground to a predetermined adjustable grain size, characterized in that a mill/sifter combination with a grain size continuously adjustable during operation is used for grinding the dust-like to fine-grained fraction.
  2. The method as claimed in claim 1, characterized in that the mill/sifter combination used is a roller grinding mill with an integrated sifter.
  3. The method as claimed in claim 2, characterized in that the grinding pressure of the mill is adjusted.
  4. The method as claimed in claim 2, characterized in that the rotational speed of the mill drive is adjusted.
  5. The method as claimed in claim 2, characterized in that the air throughput of the mill and of the sifter is adjusted.
  6. The method as claimed in claim 1 or 2, characterized in that a dynamic sifter is used.
  7. The method as claimed in claim 6, characterized in that the rotational speed of the sifter is adjusted.
  8. The method as claimed in one of claims 1 to 7, characterized in that the mill/sifter combination is adapted to any fluctuations in the quality of the raw material or to recipe changes during continuous operation.
EP04764756A 2004-09-02 2004-09-02 Method for preparing a carbon siccative for producing electrodes Revoked EP1789363B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2004/009798 WO2006024315A1 (en) 2004-09-02 2004-09-02 Method for preparing a carbon siccative for producing electrodes

Publications (2)

Publication Number Publication Date
EP1789363A1 EP1789363A1 (en) 2007-05-30
EP1789363B1 true EP1789363B1 (en) 2009-02-11

Family

ID=34958497

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04764756A Revoked EP1789363B1 (en) 2004-09-02 2004-09-02 Method for preparing a carbon siccative for producing electrodes

Country Status (6)

Country Link
US (1) US8052077B2 (en)
EP (1) EP1789363B1 (en)
JP (1) JP4857271B2 (en)
CN (1) CN100548876C (en)
DE (1) DE502004008991D1 (en)
WO (1) WO2006024315A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101450333B (en) * 2007-11-29 2011-02-02 沈阳铝镁设计研究院 Carbon raw material crushing screening method and system
US10016762B2 (en) * 2015-06-16 2018-07-10 Arvos Raymond Bartlett Snow Llc Vertical bowl mill for producing coarse ground particles
CN113372119B (en) * 2020-04-28 2022-12-30 吉林炭素有限公司 Design method for particle size composition of dry materials in graphite electrode body formula

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DE2807691B1 (en) * 1978-02-23 1979-04-26 Babcock Krauss Maffei Ind Method and device for regulating the fineness of finished goods from a grinding plant
JPS6150678A (en) * 1984-08-18 1986-03-12 川崎重工業株式会社 Classifier and controller thereof
DE8425837U1 (en) * 1984-08-31 1984-11-22 Krupp Polysius Ag, 4720 Beckum Roller mill
GB2176134A (en) * 1985-06-03 1986-12-17 Smidth & Co As F L Separator for sorting particulate material
US4798342A (en) * 1988-01-11 1989-01-17 Williams Patent Crusher And Pulverizer Company Fuel processing system for control of nitrous oxide emissions
JPH06102161B2 (en) * 1988-11-18 1994-12-14 宇部興産株式会社 How to operate the solid crusher
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DE4022062C1 (en) 1990-07-11 1991-11-14 Thyssen Stahl Ag, 4100 Duisburg, De Strip guide for butt welding along edge - uses sensors along length for control changing axial position of deflection rollers
DE4122062C2 (en) * 1991-07-03 1995-04-06 R & D Carbon Ltd Process for the preparation of a dry substance for the production of electrodes
DE4223762B4 (en) * 1992-07-18 2009-07-23 Khd Humboldt Wedag Gmbh Classifying device for sifting granular material and circulation grinding plant with the involvement of such a sifting device
US5330110A (en) * 1993-07-12 1994-07-19 Williams Robert M Apparatus for grinding material to a fineness grade
JPH1121116A (en) * 1997-06-30 1999-01-26 Nippon Steel Corp Carbonaceous powder and carbonaceous fiber coated with boron nitride
JP3635044B2 (en) * 2001-06-08 2005-03-30 三井鉱山株式会社 Negative electrode material for lithium secondary battery, method for producing the same, and lithium secondary battery
US6966508B2 (en) * 2002-12-26 2005-11-22 Edward Kenneth Levy On-line control of coal flow

Also Published As

Publication number Publication date
WO2006024315A1 (en) 2006-03-09
DE502004008991D1 (en) 2009-03-26
CN100548876C (en) 2009-10-14
JP4857271B2 (en) 2012-01-18
EP1789363A1 (en) 2007-05-30
US8052077B2 (en) 2011-11-08
US20070284463A1 (en) 2007-12-13
CN101010258A (en) 2007-08-01
JP2008511525A (en) 2008-04-17

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