Microelement Requirements of Petroleum Coke for Quality Index used for Aluminium Anode

Trace elements in petroleum coke mainly include Fe, Ca, V, Na, Si, Ni, P, Al, Pb and so on. Differ as a result the oil source of oil refining factory, trace element composition and content has the very big difference, some trace elements in crude oil into, such as S, V, and is in the process of oil exploration into, in addition in the machining process will also into part of alkali metal and alkaline earth metals, transportation, storage process will add some ash content, such as Si, Fe, Ca and so on.

The content of trace elements in petroleum coke directly affects the service life of prebaked anode and the quality and grade of electrolytic aluminum. Ca, V, Na, Ni and other elements have a strong catalytic effect on the anodic oxidation reaction, promoting the selective oxidation of the anode to make the anode drop slag and block, increasing the excess consumption of the anode. Si and Fe mainly affect the quality of primary aluminum, among which, the increase of Si content will increase the hardness of aluminum, the decrease of electrical conductivity, the increase of Fe content has a great influence on the plasticity and corrosion resistance of aluminum alloy. The contents of Fe, Ca, V, Na, Si, Ni and other trace elements in petroleum coke were restricted according to the actual production requirements of enterprises.