Calcined petroleum coke (CPC) is one of major constituent used for making graphite electrodes. Increasing demand of graphite electrodes requires more and more quantity of high quality-low sulphur calcined petroleum coke. The sulphur content of the petroleum coke strongly depends on the nature of the coking feed stock (crude oil) and its sulphur content. High sulphur coke (>1%) is not desirable for making graphite electrodes because evolution of sulphur causes puffing in the temperature range of 1,400-2,200 °C during graphitization. In this study, attempt has been made to reduce the sulphur of calcined petroleum coke by heat treatment to the acceptable level for making graphite electrodes. A high sulphur coke (approx. 2%) was heat treated up to 1,800 °C in inert atmosphere in order to reduce the sulphur content. It was observed that most of the sulphur goes off up to 1,800 °C. A sample of size 12x80 mm was prepared (by extrusion method) from desulphurized petroleum coke using coal tar binder pitch as binder at 125 °C. The extruded samples were carbonized at 900 °C, followed by graphitization at 2,900 °C. The graphitized rods were characterized for various properties such as apparent density (AD), electrical resistivity (ER), flexural strength (FS) and compared with the properties of samples made from electrode grade CPC.

中文翻译：

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热处理对石油焦脱硫的影响

煅烧石油焦（CPC）是用于制造石墨电极的主要成分之一。石墨电极的需求不断增长，需要越来越多的优质低硫煅烧石油焦。石油焦的硫含量在很大程度上取决于焦化原料（原油）的性质及其硫含量。高硫焦炭（> 1％）对于制造石墨电极是不希望的，因为在石墨化过程中，硫的释放会导致在1400-2,200°C的温度范围内膨胀。在该研究中，已经尝试通过热处理将煅烧的石油焦的硫减少到制造石墨电极的可接受水平。为了降低硫含量，将高硫焦炭（约2％）在惰性气氛中热处理至1800°C。据观察，大多数硫在高达1800°C的温度下蒸发。使用煤焦油粘结剂沥青作为粘结剂在125℃下从脱硫的石油焦中制备（通过挤压法）尺寸为12×80mm的样品。将挤出的样品在900°C下碳化，然后在2,900°C下石墨化。表征了石墨化棒的各种特性，如表观密度（AD），电阻率（ER），抗弯强度（FS），并与由电极级CPC制成的样品的特性进行了比较。