Graphite Electrode

Why Choose Us?

Professional team
After more than 20 years of development and experience accumulation. Our union has strong research and development capability, R&D centre is full responsible for test, research and product innovation, with 31 senior engineers, 96 engineers and 179 assistant engineers.

Complete range of products
We produce and operate refractory raw materials, refractory products, ceramic products, graphite electrodes, refractory binders, wear-resistant, acid-resistant and heat-resistant products, special building materials, silicon carbide products, refractory equipment, molds, copper molds, copper tubes, copper plates, Stainless steel products, slag pot, etc., including import and export. Imported calcium stabilized zirconia, yttria stabilized zirconia, quartz sand, graphite, andalusite, zirconium corundum etc.

High quality service
Zibo runjin has been persisting in a service philosophy of "Customers's Satisfaction is our eternal pursuit", taken "building a Worldwide first -class refractory manufactures" as the mission, and held "co-creation, co-operation, co-prograss, win-win"as its core values.Relying on management and technology accumulation during past many years, based on its over many years reputation as guarantee. Zibo runjin is doing its best to offer refractory system solutions with values added to achieve co-progress with our customers.

Advanced equipment
There are five high-quality clay high alumina brick production lines, two production lines for andalusite brick and mullite brick, five silica brick production lines, three production lines for continuous casting, One carbon and silicon carbide composite refractory production line ,One production line for tundish stabilizer, impact plate and slag retaining wall, a production line for high-grade light products, Pure oxide refractory production line, Unshaped refractory production line, Non-fired brick refractory product production line.

What Is Graphite Electrode

Graphite electrodes serve to transfer the electrical energy from the power supply to the steel melt in the EAF bath. They are typically made using premium petroleum needle coke, coal tar pitch, and some additives. Specification of needle coke for the manufacture of large diameter graphite electrodes.

Bottom -roller graphite carbon sleeve for Silicon carbon ...

Bottom -roller graphite carton sleeve for Silicon carbon steel annealing furnace

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Graphite Block

Medium-grain graphite materials have good resistance to thermal resistance, oxidation and

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Round Graphite

Medium-grain graphite materials have good resistance to thermal resistance, oxidation and

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Graphite Products for Chemical Equipment

This product are mainly applied to produce the equipment used in the graphite chemical industry

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Graphite Heating Elements

The special-shaped graphite products are applied to the industries such as the metallurgy, chemical

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Properties of Graphite Electrode

Electrical conductivity

hey are chosen for their superior electrical conductivity, allowing efficient electric current passage through the furnace.

Thermal resistance

Withstanding high temperatures is vital in applications like eafs. They provide excellent thermal resistance, maintaining their structure even under intense heat.

Mechanical strength

Despite the high temperatures, it needs to maintain its structural integrity. The high mechanical strength of them ensures they do not break or deform under operational conditions.

Low coefficient of thermal expansion

A low coefficient of thermal expansion means that the electrode doesn't expand much when heated. This property prevents the electrode from cracking or breaking due to rapid temperature changes in the furnace.

Why Are Graphite Electrodes Used in Electrolysis

The main reason that graphite electrodes are used in electrolysis is that graphite is an excellent conductor. The structure of graphite is such that it has a large number of electrons floating freely between the different layers of atoms (graphite bonds are formed of only three out of the four electron shells of the carbon atom, leaving the fourth electron to move freely). These electrons act as a powerful conductor, enabling the electrolysis process to progress smoothly. In addition, graphite is economical, stable at high temperatures and hard-wearing. For all these reasons, graphite electrodes are frequently used in electrolysis.

The Main Uses of Graphite Electrodes

01/

For electric arc steelmaking furnace
Electric furnace steelmaking is a big user of graphite electrodes. The output of electric furnace steel in my country accounts for about 18% of the output of crude steel, and graphite electrodes for steelmaking account for 70% to 80% of the total consumption of graphite electrodes. Electric furnace steelmaking uses graphite electrodes to introduce current into the furnace, and uses the high temperature heat source generated by the arc between the electric part and the charge for smelting.

02/

Used for submerged electric furnace
The submerged electric furnace is mainly used for the production of industrial silicon and yellow phosphorus. Its characteristic is that the lower part of the conductive electrode is buried in the charge to form an arc in the charge layer, and the heat energy from the resistance of the charge itself is used to heat the charge, which requires current high-density submerged electric furnaces need graphite electrodes. For example, about 100 kg of graphite electrodes are consumed for every 1 ton of silicon produced, and about 40 kg of graphite electrodes are consumed for every production of 1 ton of yellow phosphorus.

03/

For resistance furnace
Graphitization furnaces for producing graphite products, melting furnaces for melting glass, and electric furnaces for producing silicon carbide are all resistance furnaces. The materials in the furnace are both heating resistors and objects to be heated. Generally, conductive graphite electrodes are embedded at the end of the resistance furnace. In the furnace head wall of the part, the graphite electrode used here is discontinuously consumed.

04/

Used to prepare special-shaped graphite products
The blanks of graphite electrodes are also used for processing into various crucibles, molds, boats and heating elements and other special-shaped graphite products. For example, in the quartz glass industry, 10t of graphite electrode blanks are required to produce 1t of fused tubes, 100kg of graphite electrode blanks are required to produce 1t of quartz bricks.

The Manufacturing Process of Graphite Electrodes

Extrusion Process
The needle cokes are finely crushed and selectively sieved to ensure that only the desired particle sizes are retained. These particles are then combined with pitch in precise proportions to form a paste-like mixture. The resulting mixture is then extruded and molded into cylindrical shapes using molds of specific dimensions.

Baking Process
To carbonize the pitch, it is subjected to heat treatments of approximately 1000°C.
If baking process is carried out in a short time, cracks and pores could occur due to volatile substances included in the pitch or shrinkage. Because of that, a controlled baking and cooling process is carried out over a duration of approximately one month.

Pitch Impregnation Process
During the baking and re-baking processes, volatile substances included in the pitch evaporate, creating pores. The pores are filled again with pitch, to increase its density.
The pitch impregnation process is repeated multiple times for the electrode joints (PIN) to ensure optimal density and strength.

Rebaking Process
To carbonize the impregnated pitch, a secondary heat treatment is conducted at temperatures below 800°C. The rebaking process takes approximately one week.

Graphitization Process
Rebaked electrodes undergo a heat treatment process known as graphitization, where electric Joule heating is employed to raise the temperature to approximately 3000°C. The graphitization process depends on furnace types, typically taking anywhere between a week to a month to complete.

Machining Process
Both electrode body and the joint are machined using special machine to achieve precision levels as fine as 1/1000mm, depending on the part.

Inspection Process
After undergoing product property measurements and conducting visual inspections, the product is shipped out as the finished product.

Graphite Electrode Market – Significant Growth Factors

The graphite electrode market presents significant growth opportunities due to the increasing demand for steel products in various industries. The growth of the construction, automotive, infrastructure, and aerospace and defense sectors, which are major consumers of steel products, is driving the demand for graphite electrodes.
The shift towards electric arc furnace (EAF) technology in the steel production process, which requires graphite electrodes, is also contributing to the market's growth. The EAF method is more cost-effective and environmentally friendly than traditional steelmaking methods, and it requires a higher amount of graphite electrodes. Additionally, the increasing use of graphite electrodes in non-steel applications, such as the production of silicon metal, aluminum, and other alloys, is expected to further boost the demand for graphite electrodes in the market.
Advancements in graphite electrode technology, such as the development of ultra-high power (UHP) graphite electrodes, are providing new growth opportunities for the market players. These UHP graphite electrodes offer better performance, durability, and efficiency than conventional graphite electrodes, and they are expected to become more popular in the steel production process in the coming years.
The graphite electrode market is expected to experience significant growth opportunities due to the increasing demand for steel products, the shift towards EAF technology, the expanding use of graphite electrodes in non-steel applications, and the development of advanced graphite electrode technologies.

Graphite Products for Chemical Equipment

Common Issues and Maintenance Tips for Graphite Electrodes

Common issues faced by steel mills and foundries
● Breakage
Graphite electrodes are prone to breakage due to mechanical stress and improper handling. This can lead to significant downtime and increased operational costs.
● Oxidation
Oxidation occurs when electrodes are exposed to high temperatures and oxygen, resulting in material degradation and reduced lifespan.
● Graphite flaking
Flaking is often a result of thermal cycling and mechanical wear, which can compromise the structural integrity of the electrodes.

Tips for handling and storing graphite electrodes
Proper handling and storage are crucial to maintaining the quality of graphite electrodes.
● Use proper lifting equipment: Always employ appropriate lifting tools to prevent stress fractures and breakage during transport.
● Avoid dropping or bumping: Handle electrodes with care to avoid physical damage that can lead to breakage or flaking.
● Keep away from moisture and chemicals: Store electrodes in a dry, chemical-free environment to prevent oxidation and contamination.

The importance of regular inspections
Routine inspections are vital to ensure the longevity and performance of graphite electrodes. Here's what to look for:
● Surface cracks: Small cracks can expand under high temperatures, leading to electrode failure.
● Porosity: Porous electrodes can absorb moisture and chemicals, accelerating wear.
● Erosion: Regularly check for signs of erosion to prevent unexpected breakdowns.

Cleaning and maintenance guidelines
Maintaining your graphite electrodes can significantly extend their lifespan. Follow these maintenance tips:
● Remove excess buildup or debris: Clean electrodes regularly to avoid contamination that can affect performance.
● Repair small cracks or chips: Address minor damages promptly to prevent them from worsening.
● Apply protective coatings: Use coatings to shield electrodes from oxidation and mechanical wear.

Troubleshooting performance issues
Even with the best practices, performance issues can arise. Here's how to troubleshoot common problems:
● Poor electrical conductivity: Check for buildup or contamination that might be affecting conductivity.
● Uneven wear: Ensure electrodes are aligned correctly and operating under optimal conditions.
● Excessive consumption: Monitor usage patterns to identify and rectify inefficiencies in electrode use.

Best practices for optimizing performance and lifespan
To maximize the effectiveness and durability of your graphite electrodes, consider the following best practices:
● Choose the appropriate grade and size: Select electrodes that match the specific requirements of your applications.
● Monitor furnace conditions: Regularly check and control furnace parameters to maintain ideal operating conditions.
● Minimize excess power or heat: Avoid overloading your system to prevent unnecessary wear and tear on electrodes.

Our Factory

After more than 20 years of development and experience accumulation, The main production plants of Runjin technology and trade complex are as follows:
Qingdao Huaye New Material co., ltd.
Shandong Daqiao New Material co., Ltd.
Yangquan Wanglong Refarctories co.Ltd.
Anshan Aoan High Temperature Material Co., Ltd.
It's total assets value has reached 1.05 Billion RMB and currently employs 4078 personnel, including 544 refractory technical personnel and 3145 well trained workers
The annual production capacity has exceeded 30 thousands tons with comprehensive seven series refractories as following: Fire clay bricks, Alumina bricks, Con-casting refractory, Binder for refractory, Fine Ceramics, Graphite electrode, acid resistant brick, Silicon carbon crucible, Silicon carbon plate, Special building material, Cellulose ether, Super chamotte raw material and Synthesized mullite material, Magnesia raw material, etc. Products are applied to worldwide industries of metallurgy, building material, non-ferrous metal smelting, petrochemical, nonferrous, electronics, cement industry and so on. Approx. 68% products are supplied to metallurgy industry. China leading Steel group.-e.g.Baowu steel, Anshan steel, WISCO, SHOUGANG, TISCO, PANGANG, HBIS, SHAGANG, which belongs to same parent company are our main customers in domestic market.in oversea market, Zibo runjin is a refractory supplied of Arcelor - mittal, POSCO Guangyang steel, HYUNDAI steel, Nippon steel, JFE steel, US United Steel, Erdemir group., Danieli, SVAI and working together with famous refractory manufactures -e.g.Chosun refractories, ANH refractories and Krosaki refractories etc. Zibo runjin also has a good cooperation with world famous engineering companies .
our union has strong research and development capability, R&D centre is full responsible for test, research and product innovation, with 31 senior engineers, 96 engineers and 179 assistant engineers. Zibo runjin enables itself to be one of then leading refractory manufactures for supplying andalusite bricks for CDQ furnace, silicon bricks, AG con-casting refractory and so.
Zibo runjin has been persisting in a service philosophy of "Customers's Satisfaction is our eternal pursuit", taken "building a Worldwide first -class refractory manufactures" as the mission, and held "co-creation, co-operation, co-prograss, win-win"as its core values.Relying on management and technology accumulation during past many years, based on its over many years reputation as guarantee. Zibo runjin is doing its best to offer refractory system solutions with values added to achieve co-progress with our customers.

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FAQ

Q: What is graphite electrode?

A: Graphite electrodes serve to transfer the electrical energy from the power supply to the steel melt in the EAF bath. They are typically made using premium petroleum needle coke, coal tar pitch, and some additives. Specification of needle coke for the manufacture of large diameter graphite electrodes.

Q: Why are graphite electrodes used in electrolysis?

A: The main reason that graphite electrodes are used in electrolysis is that graphite is an excellent conductor. The structure of graphite is such that it has a large number of electrons floating freely between the different layers of atoms (graphite bonds are formed of only three out of the four electron shells of the carbon atom, leaving the fourth electron to move freely). These electrons act as a powerful conductor, enabling the electrolysis process to progress smoothly. In addition, graphite is economical, stable at high temperatures and hard-wearing. For all these reasons, graphite electrodes are frequently used in electrolysis.

Q: What are the characteristics of graphite electrodes?

A: Electrical conductivity: They are chosen for their superior electrical conductivity, allowing efficient electric current passage through the furnace.
Thermal resistance: Withstanding high temperatures is vital in applications like eafs. They provide excellent thermal resistance, maintaining their structure even under intense heat.

Q: What matters should be paid attention to in the storage of graphite electrodes in steel mills?

A: The electrodes and connectors should be stored on a clean concrete floor to prevent the electrodes from being damaged or sticking to soil; do not remove the packaging for the electrodes that are not used temporarily to prevent dust and debris from falling on the connector threads or the electrode end face and the inner thread of the electrode hole superior. Electrodes should be neatly stored in the warehouse, and both ends of the electrode stack should be padded to prevent slipping. The stack height of the electrodes should generally not exceed two meters. The stored electrodes should be protected from rain and moisture to avoid cracks and accelerated oxidation of the electrodes during steelmaking. Do not store the electrode connector near high temperature to prevent the connector plug from melting and overflowing.

Q: Are graphite electrodes suitable for electrolysis?

A: Yes! Graphite's excellent conductive properties, coupled with its high melting point (enabling it to be used appropriately in a wide range of different electrolysis reactions), low price and toughness means it's a good choice for an electrolysis electrode.

Q: What happens to a solution during electrolysis when graphite electrodes are used?

A: Graphite enables positively charged ions (metals and hydrogen) to obtain electrons from the negatively charged electrode. Conversely, negatively charged ions lose electrons (oxidation).

Q: What are graphite electrodes made of?

A: The main ingredient in graphite electrodes is synthetic graphite, which is produced by heating petroleum coke, a by-product from oil refining. This transforms the coke into a very crystalline, conductive form of carbon.
The electrodes also contain elements like coal tar pitch and calcined anthracite to help hold them together and resist oxidation while being baked at blazing temps over 2500°c. Some metal particles are added, too, to boost conductivity.

Q: Why graphite electrodes are essential for steel mills?

A: In steel mills, graphite electrodes make melting scrap metal and raw materials possible by creating electrical arcs that heat up to about 3600°C. This allows the desired chemical transformations to occur so the end product steel has just the right composition and properties.
The electrodes withstand incredibly high heat and current loads as they constantly burn away and get replaced in the furnace. Good-quality electrodes are vital for steel mills to operate efficiently.

Q: Are carbon and graphite electrodes the same?

A: Carbon electrodes are generally less expensive but have limitations in terms of lifespan and electrical conductivity. Graphite electrodes, on the other hand, offer superior performance in high-temperature and high-current applications but are typically more expensive.

Q: Where to use graphite electrodes?

A: Graphite electrodes are used primarily in electric arc furnace steel manufacturing. Graphite electrodes can provide high levels of electrical conductivity and capability of sustaining the extremely high levels of generated heat.

Q: Why do graphite electrodes need to be replaced regularly?

A: The oxygen reacts with the carbon in the electrodes, forming carbon dioxide which bubbles off. Carbon is therefore lost from the positive electrodes, so they must be replaced frequently. This adds to the cost of the process.

Q: What happens to graphite electrodes?

A: Oxidation: At the high temperatures present in the arc furnace, graphite electrodes can undergo oxidation, leading to the formation of carbon dioxide gas. This oxidation process contributes to the consumption of the electrodes.

Q: Why are graphite electrodes preferred?

A: Graphite is used in making electrodes because it is good conductor of electricity due to the presence of free electrons. One valence electron of each carbon atom remains free and thus it is a good conductor of electricity.

Q: Why do positive graphite electrodes need to be replaced?

A: The molten aluminium sinks to the bottom of the cell, where it is tapped off. This oxygen reacts with the carbon of the positive electrodes, forming carbon dioxide, so they gradually burn away. As a result, the positive electrodes have to be replaced frequently. This adds to the cost of the process.

Q: Why do graphite electrodes need to be porous?

A: The porous structure can reduce the electrochemical polarization due to fast mass transportation. Beneficial from this structure, the electrode shows enhanced electrochemical activity and reversibility in redox reactions along with stability at high current densities.

Q: What are the different types of graphite electrodes?

A: Graphite electrodes are also used to refine steel in ladle furnaces and in other smelting processes. Graphite electrodes are divided into 4 Types: RP Graphite electrodes, HP Graphite electrodes, SHP Graphite electrodes, UHP Graphite electrodes.

Q: What is the raw material of graphite electrode?

A: Artificial graphite electrodes are currently a standard in EAF operations. Raw materials are petroleum coke (needle type is preferred) and coal tar pitch. They are mixed and processed at high temperature in several steps.

Q: How to clean a graphite electrode?

A: Swilling of scrapped graphite rods was done in a sonicator bath (35°C, 10-15 min) and subjected to etching treatment (0.6 M HCl, 0.5 h). It was then exposed to the repeated cycles of rinsing with acetone, oven-dried and crushed into fine powder.

Q: How to store graphite electrodes?

A: Proper handling and storage are crucial to maintaining the quality of graphite electrodes.
Use proper lifting equipment: Always employ appropriate lifting tools to prevent stress fractures and breakage during transport.
Avoid dropping or bumping: Handle electrodes with care to avoid physical damage that can lead to breakage or flaking.
Keep away from moisture and chemicals: Store electrodes in a dry, chemical-free environment to prevent oxidation and contamination.

Q: Why do graphite electrodes need to be checked regularly?

A: Routine inspections are vital to ensure the longevity and performance of graphite electrodes. Here's what to look for:
Surface cracks: Small cracks can expand under high temperatures, leading to electrode failure.
Porosity: Porous electrodes can absorb moisture and chemicals, accelerating wear.
Erosion: Regularly check for signs of erosion to prevent unexpected breakdowns.

As one of the leading graphite electrode suppliers in China, we warmly welcome you to buy or wholesale high-grade graphite electrode in stock here from our factory. All our products are with high quality and competitive price.

Graphite Products For Chemical Equipment, Graphite Heating Elements, Continuous Annealing Furnace