calcined coke is a high-quality, pure petroleum coke that is produced by further processing oil refinery petroleum coke. It is needle-like in shape with a very low metal content and high electrical resisitivity. These properties make it ideally suited to be blended with coal tar pitch and molded into graphite electrodes for electric arc furnaces (EAF).

Production Process of calcined coke
The production process of Needle Coke starts with the selection of high-quality, low-sulfur petroleum coke feedstock from oil refineries. This feedstock undergoes partial oxidation at high temperatures in order to increase the coking value and enhance the needle-like crystalline structure. Next, the coke goes through a fixed carbon washing process to further purify it by removing metals and sulfur compounds. Finally, the calcined coke particles are processed into precise sizes, shapes and purity levels required for blending with coal tar pitch. Specialized control is required throughout production to ensure the coke meets the stringent electrical resistivity and mechanical strength specifications for graphite electrodes.

Key Properties of Needle Coke
Several key properties are evaluated to ensure the calcined coke can effectively function as a raw material for producing quality graphite electrodes. The most important properties include electrical resistivity, degree of graphitization, coefficient of thermal expansion and strength. The coke must have an ultra-low electrical resistivity below 150μΩ-m to effectively conduct electricity through the electrode.

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