Needle coke is a high quality variety vigorously developed in carbon materials. Its appearance is silvery gray and porous solid with metallic luster. Its structure has obvious flow texture, with large and few holes and a slightly oval shape.Is the production of ultra-high power electrode, special carbon materials, carbon fiber and its composite materials and other high-end carbon products raw materials.According to the different production materials, needle coke can be divided into oil – based needle coke and coal-based needle coke.The needle coke produced with petroleum residue as raw material is oil needle coke.Needle coke produced from coal tar pitch and its fraction is coal – measure needle coke.
Needle coke is a high quality material for high power and ultra-high power electrodes. Graphite electrodes made from needle coke have the advantages of strong thermal impact performance, high mechanical strength, good oxidation performance, low electrode consumption and high allowable current density.
Needle coke can be divided into petroleum and coal measures according to the raw materials used.Petroleum is represented by the United States, and coal is represented by Japan.Production units at Mitsubishi Chemical and Nippon Chemical in Japan went into production in the late 1970s and early 1980s.The Great Lakes Carbon Company in the United States was the first to develop it in 1950.In 1964, Union Carbide succeeded in making ultra-high power electrodes from needle coke.
According to the latest statistics, the domestic demand for high power and ultra-high power electrodes is 60,000-100,000 t/a, and the corresponding demand for needle focal is 60,000-120,000 t/a.Due to the limited quantity of imported needle coke, jinzhou Petrochemical Company's output is only 30,000 t/a.Therefore, the output of ultra-high power electrode in China has to be determined by the number of needle coke.