CN110627503A - Preparation method of ultrahigh-power graphite electrode - Google Patents
Preparation method of ultrahigh-power graphite electrode Download PDFInfo
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- CN110627503A CN110627503A CN201911015198.XA CN201911015198A CN110627503A CN 110627503 A CN110627503 A CN 110627503A CN 201911015198 A CN201911015198 A CN 201911015198A CN 110627503 A CN110627503 A CN 110627503A
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Abstract
The invention belongs to the field of preparation of graphite electrodes, in particular to a preparation method of an ultrahigh-power graphite electrode, which aims at solving the problem that the conventional preparation method of the ultrahigh-power graphite electrode is inconvenient to quickly and uniformly stir raw materials, and provides the following scheme, comprising the following steps: s1: screening needle coke, the ultrahigh-power graphite electrode roasted fragments and the ultrahigh-power graphite electrode graphite fragments to obtain uniform raw materials; s2: adding the raw materials into a kneading pot, adding carbon fibers, stirring, adding the melted bonding asphalt by using a feeding mechanism, heating and uniformly stirring to obtain paste; s3: putting the paste into a press to prepare a raw product, and roasting the raw product for the first time, dipping and roasting for the second time to obtain a roasted product; s4: the method can quickly stir and mix the raw materials uniformly, and improve the preparation quality of the electrode.
Description
Technical Field
The invention relates to the technical field of preparation of graphite electrodes, in particular to a preparation method of an ultrahigh-power graphite electrode.
Background
The graphite electrode is made up by using petroleum coke and needle coke as raw material and coal pitch as binding agent through the processes of calcining, proportioning, kneading, press forming, roasting, graphitizing and machining, and is a conductor for heating and melting furnace charge by using electric energy released in the form of electric arc in electric arc furnace.
The main raw material for producing the graphite electrode is petroleum coke, a small amount of asphalt coke can be added into the common power graphite electrode, and the sulfur content of the petroleum coke and the sulfur content of the asphalt coke cannot exceed 0.5 percent. Needle coke is also required to be added when producing high-power or ultra-high-power graphite electrodes. The main raw material for producing the anode for aluminum is petroleum coke, the sulfur content is controlled to be not more than 1.5-2%, and the petroleum coke and the asphalt coke meet the national relevant quality standards.
Through retrieval, a patent with the application number of 201210580592.X discloses a preparation method of a high-strength ultrahigh-power graphite electrode, which comprises 0.2-0.8% of carbon fiber, 56-65% of domestic coal series coke, 25-30% of bonding asphalt, 2-10% of ultrahigh-power graphite electrode baking scraps and 3.2-8.8% of ultrahigh-power graphite electrode scraps by weight percentage. Wherein the needle coke has the following granularity composition: 12-17% of 16-22mm, 10-13% of 6-16mm, 8-12% of 2-6mm, 25-30% of 0.5-0.075mm, and 28-45% of-0.075 mm; the particle sizes of the ultrahigh power graphite electrode baking scraps accounting for 2-10% of the content and the ultrahigh power graphite electrode scraps accounting for 3.2-8.8% of the content are both 1-2 mm. The production steps comprise kneading, profiling, primary roasting, dipping, secondary roasting, graphitizing and processing the finished product. The ultrahigh-power graphite electrode prepared by the method not only reduces the resistivity and improves the breaking strength, but also effectively reduces the production cost and improves the market competitiveness.
However, the above patent documents do not facilitate rapid and uniform stirring of the raw materials when the ultra-high power graphite electrode is prepared, and therefore we propose a method for preparing the ultra-high power graphite electrode to solve the above problems.
Disclosure of Invention
The invention aims to solve the defect that the raw materials are not convenient to stir uniformly and quickly in the prior art, and provides a preparation method of an ultrahigh-power graphite electrode.
In order to achieve the purpose, the invention adopts the following technical scheme:
a preparation method of an ultrahigh-power graphite electrode comprises the following steps:
s1: screening needle coke, the ultrahigh-power graphite electrode roasted fragments and the ultrahigh-power graphite electrode graphite fragments to obtain uniform raw materials;
s2: adding the raw materials into a kneading pot, adding carbon fibers, stirring, adding the melted bonding asphalt by using a feeding mechanism, heating and uniformly stirring to obtain paste;
s3: putting the paste into a press to prepare a raw product, and roasting the raw product for the first time, dipping and roasting for the second time to obtain a roasted product;
s4: loading the roasted product into an inner-series graphitization furnace for graphitization treatment to obtain a graphitized product;
s5: and processing the graphitized product into finished products with different specifications according to the technical requirements, thus obtaining the ultrahigh-power graphite electrode.
Preferably, in S1, during the screening, the raw material is first put into the hopper, a baffle is disposed at the bottom of the hopper, a screening machine is disposed below the hopper, the baffle is driven by a push rod motor, the push rod motor is controlled by a controller, and the controller is programmable, and sets an on-off period of the push rod motor, so as to intermittently discharge the raw material and prevent the raw material from being accumulated in the screening machine.
Preferably, a screening frame is arranged in the screening machine, a screen is arranged in the screening frame, the screen is detachably mounted in the screening frame, and the corresponding screen is placed according to the screened raw materials to prepare the ultrahigh-power graphite electrode roasting fragments and the ultrahigh-power graphite electrode graphite fragments with the granularity of 1-2mm and the needle coke with the granularity of 14-18 mm.
Preferably, be equipped with guide mechanism between hopper and the material screening machine, guide mechanism includes tamper and electric putter, and electric putter is controlled by the controller, and the tamper constantly removes from top to bottom by electric putter control, smashes about the feed opening of hopper through the tamper, can accelerate the unloading speed of raw materials, prevents that the feed opening is blocked up to the raw materials.
Preferably, in the step S2, the raw materials are added into a kneading pot, carbon fibers with a length of 15-18mm are added, stirring is completed by driving a stirring shaft and stirring blades to rotate by a stirring motor, and the rotation speed of the stirring shaft is 700 plus 800 r/min.
Preferably, in S2, the melted bonding asphalt is placed into a feeding box, a discharging pipe is arranged at the bottom of the feeding box, an electromagnetic valve is arranged on the discharging pipe, the electromagnetic valve is controlled by a controller, the feeding box can horizontally move back and forth above the kneading pot, the controller controls the electromagnetic valve to open, so that the melted bonding asphalt can be uniformly added into the kneading pot, the heating and the stirring are uniform, and the temperature in the kneading pot is 170 and 175 ℃, so as to obtain the paste.
Preferably, in S2, the kneading pot is provided with a temperature monitor and a heater, the temperature monitor monitors the temperature in the kneading pot, and transmits the monitored data to the controller, and compares the monitored data with the preset data in the controller, when the temperature is lower than the preset value, the controller controls the heater to operate to raise the temperature, so as to ensure that the temperature is within the controllable range.
Preferably, in S2, be equipped with swing mechanism on the kneading pot, swing mechanism and agitator motor fixed connection drive agitator motor, (mixing) shaft and stirring leaf through swing mechanism and can swing when the pivoted, increase the stirring scope, make the raw materials mix more evenly.
Preferably, be equipped with counter and alarm in the charging box, alarm and counter uniform control are connected, measure the bonding pitch that melts in the charging box through the counter, and when the bonding pitch that melts used up, the alarm reported to the police, reminds to add the raw materials.
Preferably, be equipped with the heating intermediate layer on the charging box, be equipped with the heater strip in the heating intermediate layer, the heater strip heats the charging box, prevents that the bonding pitch that melts from solidifying.
Compared with the prior art, the invention has the beneficial effects that:
according to the scheme, the raw materials are discharged discontinuously, so that the raw materials are prevented from being accumulated in the screening machine;
the tamping rod is used for tamping the feed opening of the hopper up and down, so that the feeding speed of the raw materials can be increased, and the feed opening is prevented from being blocked by the raw materials;
the feeding box can horizontally move back and forth above the kneading pot, so that the melted bonding asphalt can be uniformly added into the kneading pot, and the raw materials are more uniformly and quickly mixed;
according to the scheme, the stirring motor, the stirring shaft and the stirring blades are driven by the swinging mechanism to swing while rotating, so that the stirring range is increased, and raw materials are mixed more uniformly;
the invention can quickly stir and mix the raw materials uniformly and improve the preparation quality of the electrode.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments.
Example one
A preparation method of an ultrahigh-power graphite electrode comprises the following steps:
s1: needle coke, ultrahigh power graphite electrode roasting scraps and ultrahigh power graphite electrode graphite scraps are screened to obtain uniform raw materials, the raw materials are firstly put into a hopper during screening, a baffle is arranged at the bottom of the hopper, a screening machine is arranged below the hopper and driven by a push rod motor, the push rod motor is controlled by a controller, the controller is programmable, the switching period of the push rod motor is set to ensure that the raw materials are discharged discontinuously, the raw materials are prevented from being accumulated in the screening machine, a screening frame is arranged in the screening machine, a screen is arranged in the screening frame and is detachably arranged in the screening frame, corresponding screens are put into the raw materials according to screening to prepare the ultrahigh power graphite electrode roasting scraps and the ultrahigh power graphite electrode graphite scraps with the granularity of 1mm, the needle coke with the granularity of 14mm, a guide mechanism is arranged between the hopper and the screening machine, the guide mechanism comprises a tamping rod and an electric push rod, the electric push rod is controlled by the controller, the tamping rod is controlled by the electric push rod to move up and down continuously, and the tamping rod is used for tamping up and down at the feed opening of the hopper, so that the feeding speed of raw materials can be increased, and the raw materials are prevented from blocking the feed opening;
s2: adding raw materials into a kneading pot, adding carbon fibers, wherein the length of the carbon fibers is 15mm, stirring, wherein a stirring shaft and stirring blades are driven by a stirring motor to rotate to finish stirring, the rotating speed of the stirring shaft is 700r/min, molten bonding asphalt is put into a feeding box, a discharging pipe is arranged at the bottom of the feeding box, an electromagnetic valve is arranged on the discharging pipe and is controlled by a controller, the feeding box can horizontally move back and forth above the kneading pot, the controller controls the electromagnetic valve to be opened, so that the molten bonding asphalt can be uniformly added into the kneading pot, the heating and stirring are uniform, the temperature in the kneading pot is 170 ℃, preparing is carried out, a temperature monitor and a heater are arranged on the kneading pot, the temperature in the kneading pot is monitored by the temperature monitor, the monitored data is transmitted to the controller and is compared with the data preset in the controller, when the temperature is lower than a preset value, the controller controls the heater to operate, so that the temperature is increased and is ensured to be within a controllable range. The mixing and kneading pot is provided with a swing mechanism, the swing mechanism is fixedly connected with a stirring motor, the stirring motor is driven by the swing mechanism, a stirring shaft and a stirring blade can swing while rotating, the stirring range is increased, raw materials are mixed more uniformly, a meter and an alarm are arranged in the charging box, the alarm is uniformly controlled and connected with the meter, molten bonding asphalt in the charging box is measured by the meter, when the molten bonding asphalt is used up, the alarm gives an alarm to remind of adding the raw materials, a heating interlayer is arranged on the charging box, a heating wire is arranged in the heating interlayer, and the heating wire heats the charging box to prevent the molten bonding asphalt from solidifying;
s3: putting the paste into a press to prepare a raw product, and roasting the raw product for the first time, dipping and roasting for the second time to obtain a roasted product;
s4: loading the roasted product into an inner-series graphitization furnace for graphitization treatment to obtain a graphitized product;
s5: and processing the graphitized product into finished products with different specifications according to the technical requirements, thus obtaining the ultrahigh-power graphite electrode.
Example two
A preparation method of an ultrahigh-power graphite electrode comprises the following steps:
s1: needle coke, ultrahigh power graphite electrode roasting scraps and ultrahigh power graphite electrode graphite scraps are screened to obtain uniform raw materials, the raw materials are firstly put into a hopper during screening, a baffle is arranged at the bottom of the hopper, a screening machine is arranged below the hopper and driven by a push rod motor, the push rod motor is controlled by a controller, the controller is programmable, the switching period of the push rod motor is set to ensure that the raw materials are discharged discontinuously, the raw materials are prevented from being accumulated in the screening machine, a screening frame is arranged in the screening machine, a screen is arranged in the screening frame and is detachably arranged in the screening frame, corresponding screens are put into the raw materials according to screening to prepare the ultrahigh power graphite electrode roasting scraps and the ultrahigh power graphite electrode graphite scraps with the granularity of 2mm and needle coke with the granularity of 16mm, a guide mechanism is arranged between the hopper and the screening machine and comprises a tamping rod and an electric push rod, the electric push rod is controlled by the controller, the tamping rod is controlled by the electric push rod to move up and down continuously, and the tamping rod is used for tamping up and down at the feed opening of the hopper, so that the feeding speed of raw materials can be increased, and the raw materials are prevented from blocking the feed opening;
s2: adding raw materials into a kneading pot, adding carbon fibers, wherein the length of the carbon fibers is 16mm, stirring, wherein a stirring shaft and stirring blades are driven by a stirring motor to rotate to finish stirring, the rotating speed of the stirring shaft is 750r/min, molten bonding asphalt is put into a feeding box, a discharging pipe is arranged at the bottom of the feeding box, an electromagnetic valve is arranged on the discharging pipe and is controlled by a controller, the feeding box can horizontally move back and forth above the kneading pot, the controller controls the electromagnetic valve to be opened, so that the molten bonding asphalt can be uniformly added into the kneading pot, the heating and stirring are uniform, the temperature in the kneading pot is 173 ℃, preparing the paste, a temperature monitor and a heater are arranged on the kneading pot, the temperature in the kneading pot is monitored by the temperature monitor, the monitored data is transmitted to the controller to be compared with the data preset in the controller, when the temperature is lower than a preset value, the controller controls the heater to operate, so that the temperature is increased and is ensured to be within a controllable range. The mixing and kneading pot is provided with a swing mechanism, the swing mechanism is fixedly connected with a stirring motor, the stirring motor is driven by the swing mechanism, a stirring shaft and a stirring blade can swing while rotating, the stirring range is increased, raw materials are mixed more uniformly, a meter and an alarm are arranged in the charging box, the alarm is uniformly controlled and connected with the meter, molten bonding asphalt in the charging box is measured by the meter, when the molten bonding asphalt is used up, the alarm gives an alarm to remind of adding the raw materials, a heating interlayer is arranged on the charging box, a heating wire is arranged in the heating interlayer, and the heating wire heats the charging box to prevent the molten bonding asphalt from solidifying;
s3: putting the paste into a press to prepare a raw product, and roasting the raw product for the first time, dipping and roasting for the second time to obtain a roasted product;
s4: loading the roasted product into an inner-series graphitization furnace for graphitization treatment to obtain a graphitized product;
s5: and processing the graphitized product into finished products with different specifications according to the technical requirements, thus obtaining the ultrahigh-power graphite electrode.
EXAMPLE III
A preparation method of an ultrahigh-power graphite electrode comprises the following steps:
s1: needle coke, ultrahigh-power graphite electrode roasting scraps and ultrahigh-power graphite electrode graphite scraps are screened to obtain uniform raw materials, the raw materials are firstly put into a hopper during screening, a baffle is arranged at the bottom of the hopper, a screening machine is arranged below the hopper and driven by a push rod motor, the push rod motor is controlled by a controller, the controller is programmable, the switching period of the push rod motor is set, the raw materials are discharged discontinuously, the raw materials are prevented from being accumulated in the screening machine, a screening frame is arranged in the screening machine, a screen is arranged in the screening frame and is detachably arranged in the screening frame, corresponding screens are put into the raw materials according to screening to prepare the ultrahigh-power graphite electrode roasting scraps and the ultrahigh-power graphite electrode graphite scraps with the granularity of 2mm and the needle coke with the granularity of 18mm, a guide mechanism is arranged between the hopper and the screening machine and comprises a tamping rod and an electric push rod, the electric push rod is controlled by the controller, the tamping rod is controlled by the electric push rod to move up and down continuously, and the tamping rod is used for tamping up and down at the feed opening of the hopper, so that the feeding speed of raw materials can be increased, and the raw materials are prevented from blocking the feed opening;
s2: adding raw materials into a kneading pot, adding carbon fibers, wherein the length of the carbon fibers is 18mm, stirring, wherein a stirring shaft and stirring blades are driven by a stirring motor to rotate to complete stirring, the rotating speed of the stirring shaft is 800r/min, molten bonding asphalt is put into a feeding box, a discharging pipe is arranged at the bottom of the feeding box, an electromagnetic valve is arranged on the discharging pipe and is controlled by a controller, the feeding box can horizontally move back and forth above the kneading pot, the controller controls the electromagnetic valve to be opened so that the molten bonding asphalt can be uniformly added into the kneading pot, heating and stirring are uniform, the temperature in the kneading pot is 175 ℃, preparing the paste, a temperature monitor and a heater are arranged on the kneading pot, the temperature in the kneading pot is monitored by the temperature monitor, the monitored data is transmitted to the controller and compared with the data preset in the controller, when the temperature is lower than a preset value, the controller controls the heater to operate, the temperature is raised, the temperature is guaranteed to be within a controllable range, the mixing pot is provided with a swing mechanism, the swing mechanism is fixedly connected with the stirring motor, the stirring shaft and the stirring blades are driven by the swing mechanism to swing while rotating, the stirring range is increased, raw materials are mixed more uniformly, a meter and an alarm are arranged in the feeding box, the alarm is in uniform control connection with the meter, molten bonding asphalt in the feeding box is measured by the meter, when the molten bonding asphalt is used up, the alarm gives an alarm to remind of adding the raw materials, a heating interlayer is arranged on the feeding box, a heating wire is arranged in the heating interlayer, and the heating wire heats the feeding box to prevent the molten bonding asphalt from solidifying;
s3: putting the paste into a press to prepare a raw product, and roasting the raw product for the first time, dipping and roasting for the second time to obtain a roasted product;
s4: loading the roasted product into an inner-series graphitization furnace for graphitization treatment to obtain a graphitized product;
s5: and processing the graphitized product into finished products with different specifications according to the technical requirements, thus obtaining the ultrahigh-power graphite electrode.
Through the preparation method of the ultrahigh-power graphite electrode provided by the first, second and third embodiments, the raw materials can be rapidly stirred and uniformly mixed, the preparation quality of the electrode is improved, and the second embodiment is the best embodiment.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (10)
1. A preparation method of an ultrahigh-power graphite electrode is characterized by comprising the following steps:
s1: screening needle coke, the ultrahigh-power graphite electrode roasted fragments and the ultrahigh-power graphite electrode graphite fragments to obtain uniform raw materials;
s2: adding the raw materials into a kneading pot, adding carbon fibers, stirring, adding the melted bonding asphalt by using a feeding mechanism, heating and uniformly stirring to obtain paste;
s3: putting the paste into a press to prepare a raw product, and roasting the raw product for the first time, dipping and roasting for the second time to obtain a roasted product;
s4: loading the roasted product into an inner-series graphitization furnace for graphitization treatment to obtain a graphitized product;
s5: and processing the graphitized product into finished products with different specifications according to the technical requirements, thus obtaining the ultrahigh-power graphite electrode.
2. The method of claim 1, wherein in step S1, the raw material is first fed into the hopper, the bottom of the hopper is provided with a baffle, the screening machine is arranged below the hopper, the baffle is driven by a push rod motor, the push rod motor is controlled by a controller, and the controller is programmable to set the on/off period of the push rod motor, so as to intermittently discharge the raw material and prevent the raw material from accumulating in the screening machine.
3. The method for preparing an ultrahigh-power graphite electrode according to claim 2, wherein a screen frame is arranged in the screening machine, a screen is arranged in the screen frame, the screen is detachably mounted in the screen frame, and the ultrahigh-power graphite electrode roasted fragments and the ultrahigh-power graphite electrode graphite fragments with the particle size of 1-2mm and needle coke with the particle size of 14-18mm are prepared by putting the screened raw materials into corresponding screens.
4. The method for preparing an ultra-high power graphite electrode according to claim 2, wherein a material guiding mechanism is disposed between the hopper and the sieving machine, the material guiding mechanism comprises a ram and an electric push rod, the electric push rod is controlled by the controller, the ram is controlled by the electric push rod to move up and down continuously, and the ram is driven up and down at the discharge opening of the hopper, so as to accelerate the discharge of the raw material and prevent the raw material from blocking the discharge opening.
5. The method as claimed in claim 1, wherein in step S2, the raw material is added into a kneading pot, carbon fiber is added, the length of the carbon fiber is 15-18mm, the stirring is completed by driving a stirring shaft and stirring blades to rotate by a stirring motor, and the rotation speed of the stirring shaft is 700-.
6. The method as claimed in claim 1, wherein in step S2, the melted bonding asphalt is placed in a feeding box, a discharging pipe is arranged at the bottom of the feeding box, an electromagnetic valve is arranged on the discharging pipe and is controlled by a controller, the feeding box can horizontally move back and forth above the kneading pot, the controller controls the electromagnetic valve to open, so that the melted bonding asphalt can be uniformly fed into the kneading pot, the heating and stirring are uniform, and the temperature in the kneading pot is 170-175 ℃, thereby obtaining the paste.
7. The method of claim 1, wherein in step S2, the kneading pot is provided with a temperature monitor and a heater, the temperature in the kneading pot is monitored by the temperature monitor, and the monitored data is transmitted to the controller, and compared with the preset data in the controller, when the temperature is lower than the preset value, the controller controls the heater to operate to raise the temperature, so as to ensure the temperature is within a controllable range.
8. The method of claim 1, wherein in step S2, the kneading pot is provided with a swing mechanism, the swing mechanism is fixedly connected to the stirring motor, and the stirring motor, the stirring shaft and the stirring blades are driven by the swing mechanism to swing while rotating, so as to increase the stirring range and make the raw materials mixed more uniformly.
9. The method for preparing the ultrahigh-power graphite electrode according to claim 6, wherein a meter and an alarm are arranged in the charging box, the alarm is uniformly and controllably connected with the meter, the meter is used for metering the melted bonding asphalt in the charging box, and when the melted bonding asphalt is used up, the alarm gives an alarm to remind of adding raw materials.
10. The method for preparing an ultrahigh-power graphite electrode according to claim 6, wherein a heating interlayer is arranged on the charging box, a heating wire is arranged in the heating interlayer, and the heating wire heats the charging box to prevent the melted bonding asphalt from solidifying.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113816743A (en) * | 2021-07-30 | 2021-12-21 | 开封平煤新型炭材料科技有限公司 | High-strength graphite electrode joint preparation device and process |
| CN114538946A (en) * | 2022-03-09 | 2022-05-27 | 湖南大学 | High-strength and high-toughness graphite and preparation method thereof |
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| CN110339775A (en) * | 2019-07-24 | 2019-10-18 | 成都承新科技有限公司 | A kind of Preparation equipment and method of graphite electrode nipple |
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| CN102363526A (en) * | 2011-06-09 | 2012-02-29 | 中平能化集团开封炭素有限公司 | Ultra high power graphite electrode with its diameter being 650mm and production method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113816743A (en) * | 2021-07-30 | 2021-12-21 | 开封平煤新型炭材料科技有限公司 | High-strength graphite electrode joint preparation device and process |
| CN114538946A (en) * | 2022-03-09 | 2022-05-27 | 湖南大学 | High-strength and high-toughness graphite and preparation method thereof |
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