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.

Calcined 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.

Positive and negative 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.

Application of Graphite Electrode

Electric furnace steelmaking is a major user of graphite electrodes. The output of electric furnace steel in China accounts for about 18% of the crude steel output, 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 an electric current into the furnace, and uses the high-temperature heat source generated by the electric arc between the electrode ends and the furnace charge to conduct smelting.

Production characteristics of graphite electrodes

(1) Long production cycle. The production cycle of ordinary power graphite electrodes is about 45 days, and the production cycle of ultra high power graphite electrodes is over 70 days. However, the production cycle of graphite electrode joints that require multiple impregnations is longer.

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.