The raw material for ordinary power graphite electrodes is petroleum coke, while the raw material for high-power and ultra-high-power graphite electrodes is mainly needle coke, with coal pitch added as a binder. What are the raw materials for graphite electrodes? Graphite electrode production process flow and graphite electrode standard description.

一：What are the raw materials for graphite electrodes?

Graphite electrode is a conductive material in electric furnace steelmaking. According to the power of steelmaking electric furnace, it is divided into ordinary, high and ultra-high power graphite electrodes. The graphite electrode raw materials used in the three categories are also different. The following mainly introduces the three main graphite electrode raw materials. :

1. Petroleum coke is a petroleum product produced after the light and heavy oils are separated in crude oil distillation, and the heavy oil is then thermally cracked and coked. It is also a petroleum product produced directly from heavy oils such as diesel and wax oil through thermal cracking and coking. products. Petroleum coke is divided into high-sulfur coke (sulfur content of more than 1.5%), medium-sulfur coke (sulfur content of 0.5~1.5%) and low-sulfur coke (sulfur content of less than 0.5%) according to the sulfur content. Graphite electrodes generally use low-sulfur coke. Sulfur coke production.
2. Needle coke is a high-quality coke produced from coal or petroleum series raw materials through delayed coking and calcination. It has obvious fibrous texture, low thermal expansion coefficient and easy graphitization; it is suitable for manufacturing high power and ultra-high power. Key graphite electrode materials for graphite electrodes.
3. Coal pitch is obtained by refining or modifying the residual part of coal tar through distillation. It is a mixture of various hydrocarbons resulting from deep processing of coal tar. The composition of coal pitch is relatively complex and is a black, sticky semi-solid or Solid form. Coal pitch is divided into low temperature, medium and high temperature coal pitch according to the degree of softening; coal pitch is used as a binder and impregnating agent in the production of graphite electrode materials.

二. Graphite electrode production process

Graphite electrodes can only be used after dozens of processing steps, and the production cycle is more than 50 days; at the same time, the ratio of raw materials also has a great impact on the quality of graphite electrodes; the processing steps of graphite electrodes are mainly raw materials -> calcination -> screening -> batching —> Kneading —> Pressing —> Roasting —> Graphitization —> Processing and shaping, etc.

三. Graphite electrode standard description

Graphite electrodes currently implement the national industry standard number: YBT4090-2000 “Ultra-high power graphite electrode standard”; this ultra-high power graphite electrode standard specifies the shape, size, allowable deviation value, parameter index, and allowable current load value of the electrode. , test specifications, storage, transportation and quality certificates, etc.; high-power and ultra-high-power graphite electrodes are mainly used in the steel refining process and have strict quality requirements.