Petroleum coke

Black solid coke produced by pyrolysis and coking of petroleum vacuum residue through a coking unit at 500 to 550 ℃. Its appearance is a black or dark gray honeycomb structure, and the pores in the coke block are mostly elliptical and interconnected.

Petroleum coke

Raw material calcination is an important process in the carbon production process, and the calcination operation involves high-temperature preheating of carbon raw materials under the condition of isolating air. The purpose of calcining coke is to remove volatile matter and moisture from raw materials.

Graphite Sagger

This type of sagger is suitable for the photovoltaic industry and the lithium battery industry. It can be used as a negative electrode material for batteries, or as a positive electrode material, with a service life of more than one year in an argon environment. It is mature in technology and durable, and has long-term supply with multiple battery manufacturers.

Applications of Graphite Electrodes

Electric arc furnace steelmaking is a major consumer of graphite electrodes. In China, electric‑arc furnace steel accounts for approximately 18% of total crude steel production, and graphite electrodes used in steelmaking comprise 70% to 80% of the country’s total graphite electrode consumption. In this process, current is passed through graphite electrodes into the furnace, and the high‑temperature heat generated by the electric arc between the electrode tips and the charge is utilized for smelting.

Production Characteristics of Graphite Electrodes

(1) Long production cycle. The production cycle for standard‑power graphite electrodes is approximately 45 days, while that for ultra‑high‑power graphite electrodes exceeds 70 days; moreover, the production of graphite electrode joints requiring multiple impregnation processes takes even longer. (2) High energy consumption. Producing 1 ton of standard‑power graphite electrodes requires roughly 6,000 kWh of electricity, several thousand cubic meters of coal gas or natural gas, and about 1 ton of metallurgical coke pellets and metallurgical coke fines.

Processing of graphite electrodes

(1) Pressurized vibration method: Pressurized vibration method requires special machine tools, and the electrode mother mold is opposite to the electrode shape. Graphite materials and forming tools are placed relative to each other during processing, leaving a certain gap. A machining fluid mixed with water and abrasive is injected into it. Ultrasonic vibration of graphite and forming tools occurs while passing through the processing fluid. Under the action of abrasive impact force, graphite is slightly peeled off to form the desired shape. The abrasive is SiC, B4C, or diamond. The coarser the abrasive, the faster the processing speed. When the machine tool is working, it adopts sealed type and water curtain type for processing. EDM machining suitable for mass production.