How Is The Ash in Petroleum Coke Produced?

The main elements in petroleum coke ash are iron, silicon, calcium, aluminum, sodium, magnesium, and a small amount of vanadium, titanium, chromium, etc. The content of vanadium in petroleum coke should be limited in the production of anode materials for electrolytic aluminum and graphite anodes for electrolytic sodium chloride solution. The first factor that affects the ash content of petroleum coke is the salt content and desalination degree of crude oil. After distillation or cracking, most of the salt in crude oil is enriched in residual oil, and a small part is deposited in furnace tubes, containers and equipment. Most of the salts in the residual oil remain in the coke. The ash content of petroleum coke is also affected by the salt content of the cooling water and the high-pressure water used for unloading coke, especially the cooling water and high-pressure water used for unloading coke that have been reused for many times generally contain relatively high salt content. If the produced petroleum coke is stacked in the open air, the sediment on the ground or the sediment brought by the wind will also increase the ash content of the petroleum coke. The ash content of the petroleum coke in the production of graphite products should generally be less than 0.5%, the ash content of petroleum coke used in the production of high-purity graphite should less than 0.15%.