Nadelkoks-Graphitelektrode

 Needle coke graphite electrode manufacturer

What is needle coke and graphite electrode?

Needle coke is a silvery white solid carbon material with metallic luster. Obviously, under the microscope, it shows a needle-like texture and is used widely in high-performance graphite electrode materials. Based on the different raw materials used, needle coke can be divided into two types: oil-based and coal-based. The former is produced with petroleum residue as the raw material while coal-based needle coke is made with coal tar pitch and its fractions as the raw material.

Graphite electrodes are made from graphite, organic binder. The function is to conduct the electrical energy from the power source into the molten steel in an electric arc furnace.

Advantages of needle coke graphite electrode

Hohe Leistung

1. Hohe elektrische Leitfähigkeit

Graphite Electrode Needle Coke conductivity, thus giving efficiency in energy transfer during EAF steelmaking.

2.  Low Thermal Expansion Coefficient (CTE)

Low CTE indicates the minimal thermal stress and cracking under high-temperature fluctuation; thus, it furthers durability under extreme operations.

3.   Superior Mechanical Strength

Superb Mechanical Strength Needle-like microstructure in coke offers higher mechanical strength against the breakage during handling and operations.

4.  High Thermal Resistance

The material has structural integrity at very extreme temperatures, a feature very important for the continuous and reliable performance in high-temperature steelmaking processes.

5.  Excellent Resistance to Oxidation

Resistance to oxidation prolongs electrode life, therefore reducing frequency in replacement.

6.  Consistent Dimensional Stability

Precision manufacturing ensures consistent dimensions, an important factor for better compatibility with EAF systems.

Industrial and Sustainable Benefits

Graphit is helpful to a large extent and reduces the cost of production of steel with such volatile prices. For several industrial applications, Graphit-Elektroden are economic and quite reliable. Again, with such challenges of sustainable manufacturing and stating the ideal choice of material for industries nowadays, it is good news to hear.

Application of needle coke graphite electrode

Steelmaking and Metallurgy

Needle Coke Electrodes Electrodes are an indispensable part in all applications related to high temperature and energy. In an Electrical Arc Furnace meant for making steel, electrodes conduct a very high current. These provide the required quantity of heat to melt scrap steel and iron. Such kinds of electrodes are in much-needed for Ultra High Power Operations in the Metallurgical Industry. They have high carrying capacity with low consumptions under extreme conditions.

Various Industrial applications

These electrodes play an important role in the manufacture of lithium-ion battery anodes, too, since their high purity and high conductivity give a true boost to battery performance. In the petrochemical and chemical industries, such electrodes are indispensable for certain processes-for example, production in silicon and phosphorus industries. Besides, nonferrous smelting -industries of aluminum and magnesium, for instance-can be based only on these electrodes. Their properties being superior in this regard assure efficiency, durability, and reliability in those fields.

How to Make Needle Coke Graphite Electrode ?

1. Selection of Raw Material and Production of Needle Coke

Nadelkoks is a major aggregate for graphite electrodes that are usually made from heavy petroleum-based oils or coal tar pitch. During the production, CTE of needle coke is controlled so that the consumption of electrodes during steel making is minimum.

2. Mixing and Forming

The needle coke particles are mixed with binder pitch in the appropriate proportions and then heated, kneaded, and extruded or pressed into the desired electrode shape to produce a “green electrode.”

3. Calcination

Calcination of the green electrode is effected through heating at controlled temperature with the aim of Verkohlung of the material. Thus, volatile matter content becomes reduced and structural integrity gets improved.

4. Graphitierung

Next, the calcined electrode undergoes graphitization heat treatment in ovens with high temperatures above 2500°C. This reduces the carbon into crystalline graphite, which is vital in enhancing thermal and electrical conductivity.

5. Processing

The final graphite electrode processing to exact dimensions ensures the equipment of EAF and thus performance during the steel-making process.

6. CTE Control Technology

Among the critical reasons for graphite electrode durability and cost-effectiveness, the coefficient of thermal expansion factor takes the lead. In this respect, it is kept at a fast pyrolysis temperature above 750°C with less than a 5-second residence time to make it result in a low CTE needle coke. As for the CTE, the smaller value, better the needle coke against heating.

Why buy our graphite electrode needle coke?

Our needle coke graphite electrodes boast a high level of conductivity and are very durable; thus, their wear-off consumption rate is small. Its resistance to thermal shock and oxidation makes these materials assure efficiency in various steel processes, battery manufacturing, or non-ferrous melting.