• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The subject invention relates to a method and apparatus for producing graphite bodies from high purity carbonaceous granular material such as petroleum coke or coal tar pitch coke and at least one coker which is cokerable at elevated temperatures using puffing inhibitors, as well as a graphite body wherein said puffing inhibitor is in one Grain size of less than 2f.lm, preferably less than 1 micron is present.
    公开号:AT515863A2
    申请号:T9466/2013
    申请日:2013-03-21
    公开日:2015-12-15
    发明作者:Gerhard Hubweber
    申请人:Gerhard Hubweber；
    IPC主号:
    专利说明:

    Method and plant for producing graphite bodies Description of the invention
    Inventive subject matter:
    The invention relates to a method for producing graphite bodies from a granular solid carbonaceous material and at least one liquid binder which is cokeable at elevated temperatures and additives comprising at least the steps of mixing, shaping, baking and graphitization, wherein an additive for reducing the irreversible volume expansion is used at temperatures above 1400 ° C, a graphite body produced by the said method and an apparatus for carrying out the method.
    Background of the invention:
    Graphitized carbon bodies, hereafter called graphite bodies, are commonly used in electrochemical and electrothermal processes because of their electrical and thermal conductivity and the ability to withstand extremely high temperatures. One of the main fields of application for carbon bodies is graphite electrodes for electric arc furnaces, which are used in the steel industry for scrap melting or for smelting molten steel as so-called ladle furnaces. In addition, graphite bodies are used for furnace linings, such as the example of the lower part of blast furnaces.
    The production process for graphite bodies has been known for several decades (Winnacker Küchler, Chemical Technology, Volume 3 (Inorganic Technology Π), 4th edition, Carl Hanser Verlag Munich Vienna 1983). Raw materials used in the production of graphite bodies include: high purity carbonaceous materials in granular form such as petroleum cokes or coke-pitched cokes, especially in the form of needle cokes, and liquid coke which can be cokered at elevated temperatures, such as petroleum pitch coal tar pitch or other organic liquids such as phenolic resins and additives.
    The production process includes at least the steps - grinding and sifting of the coke - mixing of different fractions of the coke with a binder which increased at
    Temperatures is verkokbar and additives in a hot mixing process to obtain the so-called green mass, - forms of so-called green bodies either by shaping under vibration or by extrusion techniques. Baking the green bodies at temperatures up to 1000 ° C to coke the binder and obtain stable carbon bodies, and graphitizing the carbon bodies at temperatures up to 3000 ° C using electric heat.
    One of the problems in the production process, as known, is the formation of cracks at elevated temperatures between 1400 ° C and 2000 ° C during the graphitization step. The cause of the formation of these cracks is well known and described as so-called puffing caused by sulfur, this sulfur is present as an impurity in the raw materials. The sulfur causes a volume expansion in said temperature range which causes an increase in the porosity of the graphite body. To regulate puffing and reduce the risk of cracking, a number of different solutions are known. Most of these solutions result in the addition of metals or metal compounds to the coke before or during the mixing process. The addition of these substances, called inhibitors, has the advantage of regulating the puffing. However, these substances cause an increase in the linear thermal expansion coefficient of the graphite bodies. This increase causes a reduction in thermal shock resistance and an increase in the ash content. All in all, for the use of graphite bodies as electrodes for electric arc furnaces, the negative effects of the inhibitor cause an increase in the consumption of graphite per tonne of molten steel. When referring to a puffing inhibitor in the following description and the appended claims, it is to be understood that it means any substance which reduces irreversible volume expansion at temperatures above 1400 ° C.
    In practice, amounts between 1% and 2% of the inhibitor based on the total dry matter in the green mixture are used and described in the literature, for example in DE 3907158. To reduce the negative impact of the substances used as an inhibitor in graphite bodies It is known that it is necessary to minimize the amount of inhibitor required. In addition, a good distribution of the inhibitor in the carbon bodies to be graphitized is essential.
    According to the prior art, various proposals have been made to a good one
    To achieve distribution:
    In GB 733 073A it is described to use 1 to 5 mass% of iron, chromium, copper or nickel or their oxides as puffing inhibitor. These substances are metered into the coke, preferably during the grinding process in order to have a good distribution of the puffing regulatory substance in the green carbon body. FR 1491497A describes the addition of chromium, nickel or cobalt or a mixture of said metals to the mixture of coke and binder as a catalyst. No. 3,563,705 B also describes using small amounts of titanium and zirconium compounds in the mixture of coke and binder in addition to conventional puffing inhibitors such as iron or calcium oxide in order to reduce puffing. US 3 338 993 B describes the use of fluorides of calcium, magnesium, strontium or barium or mixtures thereof for the puffing reduction. JP 62059511 A describes the use of an iron compound such as iron oxide or iron hydroxide having an average particle diameter less than or equal to 3 gm mixed with coal tar peanut coke and one or more compounds selected from Ca compounds, Mg compounds, Ce compounds or La compounds as inhibitor. With these substances, the coke is mixed before it is mixed with pitch to produce graphite electrodes. However, substances with a single diameter of less than 3 gm always form agglomerates which can not be destroyed in a mixing process, so that the actual diameter of the iron compound in the mixture with pitch is much larger than 3 gm. Further, if fine-grained substances are involved When contacted with liquids, the fine grains form agglomerates which are very hard and can not easily be destroyed by a mixer. Therefore, the actual diameter of the iron compound in the mixture is determined by the diameter of the agglomerates and not just by the diameter of the single molecule.
    From DE 39 07 158 CI is known to use as inhibitor substances which are at least partially soluble in the liquid binder to provide a good distribution of the inhibitor. The disadvantage is that the proposed substances from the class of metal sulfonates, metal carboxylates or metal phenates are very costly and risky for health. It is also known from DE 39 07 158 CI to add the puffing inhibitor already in coke production in the feedstock to be coked, which puffing inhibitors are at least partially soluble in the feedstock. As in DE 39 07 158 CI, the use of substances from the class of metal sulfonates, metal carboxylates or metal phenolics is proposed.
    Summary of the invention:
    The object of the subject invention is to improve the effect of inexpensive solid puffing regulating substances such as metals or metal compounds (preferably metal oxides) which are insoluble in binders such as petrol pitch, coal tar pitch or phenolic resins. This improvement results in a reduction of the required amount of the puffing regulating substance which improves the quality of the graphite bodies produced by the method according to the invention. The second object of the subject invention is to create a graphite body produced by the process of the present invention which is characterized by the shape-controlling substance in the graphite body. An additional third object of the subject invention is to provide a device in which the proposed method can be carried out. It is not the intention of the invention to find new substances but to use known substances in a better way.
    According to the present invention, a method is proposed to produce graphitized carbon bodies from carbonaceous granular material such as petroleum coke or coal tar coke and at least one liquid binder which can be coked at higher temperatures, said method including at least the steps of mixing, coking and graphitization, wherein a puffing inhibitor from the class of metals or metal compounds, preferably metal oxides, is added to the components before they are formed into green bodies using a puffing inhibitor in a particle size smaller than 2 pm, preferably smaller than 1 pm, and the puffing inhibitor in the liquid binder is dispersed before the binder is mixed with the granular carbonaceous material. When this is done, most of the particles of the fine-grained puffing inhibitor are present in the binder as singles with an extremely high contact surface for reaction with sulfur. This results in the possibility of reducing the amount of puffing inhibitor required down to almost stoichiometric amounts. The mixture of liquid binder and dispersed puffing inhibitor is then mixed with solid carbonaceous material, resulting in a very good distribution of the extremely fine particles of the puffing inhibitor in the mixture from which green carbon bodies are formed. This excellent distribution is present up to the graphitization step and this is the unique microstructure of the puffing inhibitor in the resulting graphite bodies, which is different from other carbon bodies due to the extremely good distribution of mostly single grains of the fine grained
    Inhibitor.
    Following a further embodiment of the subject process, the process includes the steps of - dividing the amount of liquid binder for the mixing process into two parts of different size - preheating the puffing inhibitor to the temperature of the liquid binder - dispersing the puffing inhibitor in the smaller amount of the binder with a Solids content greater than 50 mass%, preferably greater than 70 mass% - combining the minor amount of binder with the large amount - homogenizing the dispersed buffering inhibitor in the total amount of binder and - combining the liquid binder containing dispersed puffing inhibitors with granular solid carbonaceous material ,
    In a preferred embodiment, to disperse the puffing inhibitor, a shear rate in the liquid binder of more than 1000 [1 / sec], preferably more than 10,000 [1 / sec] is used and an energy input of more than 5 kWh per ton of dispersion within 10 minutes , preferably greater than 8 kWh per ton of dispersion within 10 minutes (in other words, if 50 kg of a mixture of liquid binder and puffing inhibitor are dispersed for 10 minutes, the power of the electric motor must be at least 1.4 kW or preferably 2, 4 kW in order to be able to introduce an energy of 0.25 kWh, preferably 0.4 kWh into the dispersion). This can be done with dispersing machines which work better with higher solids content to produce high shear rates in the mixture, such as a dissolver disc which is known in the paint industry and which in this process has a peripheral speed of more than 10 [m / sec]. can be used or a wet mill or as an ultrasonic device as a dispersing machine. In order to have the puffing inhibitor at the same temperature as the liquid binder, it is intended for binders such as petrol pitcher or coal tar pitch, which are usually used at temperatures above 150 ° C, especially between 170 and 220 ° C, to preheat the puffing inhibitors in a preheating furnace these are introduced into the liquid binder.
    The apparatus for carrying out the method according to the invention according to the above-mentioned embodiments includes a cradle for binder and a mixer, wherein said cradle for container with piping and valves is coupled to a dispersing machine and said cradle for cradles is coupled to a preheating furnace 1 or 29 is to preheat the puffing inhibitor to the temperature of the liquid binder. In other words, the idea is to: preheat the puffing inhibitors to the temperature of the liquid binder; and mix the puffing inhibitors into the liquid binder (to prevent the inhibitor from floating on the surface of the binder) and to disperse the puffing inhibitors present in the binder are with a dispersing machine, preferably with a shear rate of more than 1000 [1 / sec], preferably of more than 10,000 [1 / sec] and with an energy input of more than 5 kWh per ton of dispersion within 10 minutes, preferably of more than 8 kWh per ton of dispersion within 10 minutes; and - adding the homogenized mixture of the binder and dispersed puffing inhibitors to the mixer to mix the binder with the solid carbonaceous material to obtain the green mass to form green carbon bodies.
    According to another preferred embodiment, the cradle for the binder is coupled with piping and valves to a rotor / stator system dispersing machine (27) and said binder is weighed coupled to a preheating furnace (1) for preheating the puffing inhibitor to the temperature of the binder.
    It is also preferable that an ultrasonic device is used as the dispersing machine.
    It is also preferable that a wet mill is used as the dispersing machine.
    It is also preferable that a dissolver disk is used as the dispersing machine.
    It is also preferred that each mixer is connected to at least two of said binder weighing vessels, said dispersing machines 10, 27 or 35 and said preheating furnaces 1 or 29. The advantage of two of said binder vessels, two of said dispersing machines and two of said pre-heating ovens is to lose no mixing time when the mixing time is shorter than the dispersion time including the filling time and discharge time of the binder in the cradle. Preferably, when two dispersing machines are used for a mixer, both dispersing machines have an identical design to have identical conditions for dispersing.
    Preferably, the said cradle for the binder is coupled with piping and valves to a rotor / stator system 35 self-priming dispersing machine and said self-priming dispersing machine is connected by piping and valves to a preheat oven 29 for preheating the puffing inhibitor to the liquid binder temperature.
    In such a device, the method of the present invention may be carried out by: maintaining the total amount of binder for a batch of mix for mixing green mass in a weighed insulated and heated vessel; and providing the puffing inhibitors in a preheat vessel in the proper amount for a batch of green mass mixers mixing in which preheating vessel the puffing inhibitors are preheated to the temperature of the liquid binder and - sucking the weighed and preheated puffing inhibitors into the binder using a self-priming rotor / stator disperging machine which preferably has the fine puffing inhibitors at a shear rate of more than 10,000 [1 / sec] and an energy input of more than 5 kWh / ton of dispersion within 10 minutes, more preferably more than 8 kWh / ton of dispersion within 10 minutes, disperse directly into the liquid binder during the time of the suction the binder is pumped by the dispersing machine itself in a loop between the self-priming machine and the vessel, thereby homogenizing the contents of the vessel; and mixing the homogenized mixture of binder and puffing inhibitors into the mixer to mix the binder with solid carbonaceous material around green To get mass and using the green mass to form green carbon bodies.
    Description of the drawings:
    A device for carrying out the method according to the invention is shown in FIGS. 1 to 3. In Fig. 1, 1 designates a preheating furnace for the puffing inhibitors 2, which furnace is e.g. a rotary kiln or a pot furnace can be. A pot oven can be emptied either by tilting the oven or by opening a bottom valve. There are two possibilities for the dosage of the puffing inhibitors: either the preheating furnace receives weighed amounts of inhibitor which is necessary for a mixer batch of the mixer 24 to mix the green mass and the entire amount of the inhibitor from the preheating furnace is transferred via a line 3 into a vessel 6 or the inhibitor in the preheating furnace is a large amount from which the amount required for a batch of mixer 24 to mix the green mass is metered into a vessel 6 using a balance 9 for that vessel. The first mentioned alternative offers the opportunity to directly create a mixture of different metals or metal compounds as puffing inhibitors. If the second alternative is used and a mixture of different puffing inhibitors is desired, the mixture must be created in a separate step in front of the preheat oven in which the mixture is metered. For the type of heating energy of the preheating furnace, there is no limitation, this can be heated electrically 4 or with burners 5 with fossil energy such as oil or gas. In this preheating oven, the inhibitor is preheated to a particle size of less than 2 gm, preferably less than 1 gm, in order to have the same temperature as the liquid binder. Liquid binders such as petroleum pitch or coal tar pitch are commonly used at temperatures above 150 ° C, especially between 170 and 220 ° C. The vessel 6 is a weighed 8 and insulated 7 and 8 heatable vessel with a bottom valve 11 and a drive motor driven dissolver disk 10 which is known in the paint industry to produce very high shear rates in the liquid. The liquid binder is metered via a line 13 with a metering valve 12 in such an amount in the cradle 6 that with the total amount of the inhibitor for a mixer batch for mixing the green mass, the solids content of the mixture in the vessel 6 more than 50 mass%, especially more than 70% by mass. If the solids content were lower, the dissolver disk 10 would not generate enough shear rate in the mixture to destroy the agglomerates and the energy input would not be sufficient. Alternatively, instead of the dissolver disc, a wet mill which is piped to the cradle 6 (for example, a Perl Mill) or an ultrasonic device may be used, both of which are not expressed in the drawing. 15 denotes a vessel which is weighed 16, insulated 17 and heated 18 and which has a bottom valve 19 and a motor-driven agitator 20. In this vessel 15, the binder is metered with a line 22, which has a metering valve 21, in an amount for a mixer of the mixer 24 for mixing the green mass dosed by the weight of the binder which for the same mixer batch of the mixer 24 into the vessel 6 has been dosed. After the correct amount of binder has been metered into the vessel 15 (known weight due to the balance 16 of the vessel 15), the bottom valve 11 of the vessel 6 is opened and the deagglomerated dispersion located in the vessel 6 flows in a conduit 14 from the vessel 6 in which the vessel 15 while the vessel 15 is stirred with the stirrer 20 to completely homogenize the mixture. The homogenized mixture of binder and inhibitor is supplied via a line 23 to the mixer 24 in which the bottom valve 19 of the vessel 15 is opened, in which mixer 24 solid granular carbonaceous material is supplied and mixed with the liquid binder to the green mass for molding the to get green carbon body. The vessel 6, including its installations, including the dispersing machine 10 and including the preheating furnace 1, can be installed twice if the mixing time of mixing 24 is so rapid that an installed means for dispersing the solid inhibitor in the liquid binder
    Capacity loss in the mixer 24 would produce.
    In Fig. 2 is shown a device wherein 1 denotes a preheating furnace which may be, for example, a rotary kiln or a pot furnace. A pot can be emptied either by tilting the oven or by opening a bottom valve. There are two possibilities for metering the inhibitor: either the preheat furnace gets weighed amounts of inhibitor necessary for a mixer charge of the mixer 24 to mix the green mass and the entire amount of inhibitor from the preheat furnace is metered via a line 3 into a vessel 15 or the inhibitor in the preheat furnace is a large amount from which the amount needed for a mixer batch of the green mass mixing mixer 24 is metered into a vessel 15 using the balance 16 for that vessel 15. The alternative mentioned first offers the opportunity to be able to directly create a mix of different puffing inhibitors. If the second alternative is used and a mixture of different puffing inhibitors is desired, the mixture must be created in a separate step in front of the preheat oven in which the mixture is metered. There is no limit to the type of heat energy of the preheating furnace, which can be heated electrically or by burning fossil fuels such as oil or gas. In this preheating oven, the inhibitor is preheated to a particle size of less than 2 μm, preferably less than 1 μm, in order to have the same temperature as the liquid binder. Liquid binders such as petroleum pitch or coal tar pitch are commonly used at temperatures above 150 ° C, especially between 170 and 220 ° C. Named 15 is a vessel which is insulated 17 and heated 18 and has a balance 16 to know the weight of its contents and two bottom valves 25 and 26 and a motor driven agitator 20. With a conduit 23, the vessel 15 with the entry of a motor-driven rotor / stator dispersing machine 27, the outlet of the motor-driven dispersing machine 27 is connected to the vessel 15 with a conduit 28 to form a loop in which the binder is pumped continuously while the high shear rate in the dispersing machine the puffing inhibitors to Einzelkömem in the Dispersed mixture with the binder, which mixture is simultaneously homogenized in the vessel 15 with the stirrer 20. The homogenized mixture of binder and inhibitor is fed via a line 23 to the mixer 24 by the bottom valve 25 of the vessel 15 is opened. Solid granular carbonaceous material is fed to the mixer 24 and mixed with the homogenized mixture of binder and inhibitor to green mass to form the green carbon bodies. The vessel 15 including its installations, the dispersing machine 27 and the preheating furnace 1 can be installed twice if the mixing time of mixing 24 is so fast that an installed means for dispersing the solid inhibitor in the liquid binder would cause a loss of capacity in the mixer 24.
    In Fig. 3, a device is shown with a Vorwärmofen 29 which has a balance 30 to receive the weight of its contents and a bottom valve 31 has to empty the furnace with a line 32. In this preheat oven, the puffing inhibitors 2 are dosed in the correct amount for a batch of mixes to mix the green mass. The heating of the puffing inhibitors is carried out either by electric heating 33 or by fossil energy burners 34. Liquid binder is metered via a line 22, which has a metering valve 21 in a vessel 15, which is isolated 17 and heated 18 and a balance 16 to obtain the weight of its contents. The amount of binder dosed into vessel 15 is the correct amount for a batch of mixer 24 to mix green mass. The liquid binder is pumped in a loop using a conduit 23 and a bottom valve 26 towards a self-priming rotor / stator dispersing machine 35, the outlet of the self-priming rotor / stator dispersing machine 35 is connected to the vessel 15 by a conduit 36. As the liquid binder is pumped in the loop, the emptying valve 31 of the preheating furnace 29 is opened and the preheated liquid binder temperature inhibitor 2 is sucked and dispersed into the liquid binder with the self-priming rotor / stator dispersing machine, using high agglomerates Shear rate in the rotor / stator machine will be destroyed. In the cradle 15, a stirrer 20 may be used, but it is not necessary to have this because the pumping effect of the self-priming rotor / stator dispersing machine is sufficient, for the reason that no puffing inhibitor can float on the surface of the binder. After the preheat furnace 29 is detected as empty by its balance 30, the emptying valve 31 is closed and the liquid binder is further pumped in the loop to homogenize the contents of the vessel 15. The homogenized mixture of binder and inhibitor is fed via a line 23 to the mixer 24 by the bottom valve 25 of the vessel 15 is opened. Into the mixer 24, solid granular carbonaceous material is fed and mixed with the homogenized mixture of binder and inhibitor to green mass to form green carbon bodies. The vessel 15, including its installations, disperger 35, and preheat oven 29 may be installed twice if the mixing time of mixing 24 is so rapid that an installed means for dispersing the solid inhibitor in the liquid vehicle would cause a loss of capacity in the mixer 24.
    The subject invention will now be explained with reference to the following example, to which, however, this is not limited. 8 g of iron oxide pigment "Bayferrox no M" having a particle size of less than 1 μm are dispersed for 10 minutes in 200 g of hot binding pitch (180 ° C.) using a rotor / stator laboratory dispersing machine (IKA Ultra Turrax). The hot dispersion is added to a preheated (150 ° C) petroleum coke mixture of 1 kg containing 50% of a coke fraction of less than 200 pm and 50% of a coke fraction having a grain size of between 1 and 3 mm. The mixing is carried out for 10 minutes with a planetary kneader, the vessel is heated with a gas burner to maintain the temperature at about 150 ° C to obtain a homogeneous mass. A part of the mass is transferred to a preheated (115 ° C) metal mold of 5 cm diameter and 25 cm in length, which is brought to a hydraulic press with which a stamp is pressed to the mass of 10 tons. The pressure is maintained until the temperature of the metal mold and the mass is below 50 ° C. The green body is squeezed out of the metal mold and baked in a laboratory oven with the green body in a capped metal jar in a packing of petroleum coke (1 mm grain size). The temperature increase is 8 ° C per hour until 800 ° C are reached. Thereafter, the heating is interrupted and the oven cools overnight. The carbon body is placed in an electrically heated argon-flooded carbon tube furnace and heated to 3000 ° C for 5 hours to obtain a body according to the present invention.
    For comparison, a sample was prepared by adding 14 grams of a commonly used ground natural iron ore as a 90% grain size inhibitor between 10 to 40 microns to a preheated (150 ° C) 1 kilogram petroleum coke mixture containing the same fraction as mentioned above. After adding 200 g of hot binding pitch (180 ° C), the same process as described above was carried out. Both samples have comparable values for density and electrical resistance, the ash content of the first sample (following the method according to the invention) is 30% lower than da " Ash content of the second sample.
    权利要求:
    Claims (13)
    [1]
    Claims 1. A process for producing graphitized carbon bodies from carbonaceous granular material such as petroleum coke or coal tar coke and at least one liquid binder cokerable at elevated temperatures, comprising at least the steps of mixing, coking and graphitization, a puffing inhibitor being selected from the class of metals or metal compounds, preferably metal oxides, to which components are added before they are formed into green bodies, characterized in that the puffing inhibitor is used in a particle size of less than 2 gm, preferably less than 1 pm, and that the puffing inhibitor is dispersed in the liquid binder before the Binder is mixed with the granular carbonaceous material.
    [2]
    2. A method according to claim 1, characterized in that said Puffinginhibitor is dispersed in the liquid binder after preheating to the temperature of the liquid binder.
    [3]
    A method according to claim 1 or 2, characterized in that said puffing inhibitor is dispersed in the liquid vehicle using a shear rate in the liquid vehicle of greater than 1000 [1 / sec], preferably greater than 10,000 [1 / sec] and an energy input of more than 5 kWh per ton of dispersion within 10 minutes, preferably more than 8 kWh per ton of dispersion within 10 minutes.
    [4]
    4. A method according to any one of claims 1 to 3, characterized in that the method comprises the steps of - dividing the amount of the liquid binder for the mixing process into two parts of different size, preheating the puffing inhibitors to the temperature of the liquid binder - dispersing the Puffinginhibitors in the smaller amount of the binder in a solids content in the mixture of more than 50% by mass, preferably more than 70% by mass, - combining the small amount of the liquid binder with the large amount • Homogenizing the dispersed puffing in the total amount of liquid Binder and - combining the liquid binder containing dispersed puffing inhibitors with granular solid carbonaceous material
    [5]
    A device for carrying out the method according to any one of claims 1 to 4, characterized in that said binder weighing vessel 15 is coupled to piping and valves with a dispersing machine 10, 27, 35, and that said binder is preheated with a preheating furnace 1.29 of the puffing inhibitor is coupled to the temperature of the liquid binder.
    [6]
    6. Device according to claim 5, characterized in that a rotor / stator dispersing machine is used as the dispersing machine.
    [7]
    7. Device according to claim 5 or 6, characterized in that a self-priming rotor / stator dispersing machine is used as a dispersing machine.
    [8]
    8. Device according to claim 5, characterized in that an ultrasonic device is used as the dispersing machine.
    [9]
    9. Device according to claim 5, characterized in that a wet mill is used as a dispersing machine.
    [10]
    10. Device according to claim 5, characterized in that a dissolver disk is used as the dispersing machine.
    [11]
    A device according to any one of claims 5 to 10, characterized in that each mixer is connected to at least two of said binder weighing vessels, said dispersing machines and said preheating furnaces.
    [12]
    12. A graphitized carbon body containing a puffing inhibitor, characterized in that said puffing inhibitor is present in a particle size of less than 2 gm, preferably less than 1 pm, and that said puffing inhibitor is distributed predominantly as Einzelkömer in the graphite body.
    [13]
    13. A graphitized carbon body according to claim 12, characterized in that the said Puffinginhibitoren with more than 70% by mass, preferably more than 80% by mass, most preferably more than 90% by mass are distributed as Einzelkömer in the graphite body.
    类似技术:
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    同族专利:
    公开号 | 公开日
    DE112013006851B4|2017-10-12|
    AT515863B1|2017-09-15|
    WO2014147434A1|2014-09-25|
    DE112013006851T5|2015-12-03|
    AT515863A5|2017-05-15|
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    PCT/IB2013/000486|WO2014147434A1|2013-03-21|2013-03-21|Method and installation to produce graphite bodies|
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