Effect of sulfur form and content in calcined coke on mechanical properties of prebaked anode
The presence and distribution of sulfur in calcined petroleum coke with varying sulfur content were characterized using X-ray diffraction and transmission electron microscopy.Meanwhile,the prebaked anode was prepared by utilizing calcined coke with different sulfur content as aggregate and coal pitch as binder.It was observed that the mechanical properties of the prebaked anode,such as flexural strength and compressive strength,exhibit a positive correlation with sulfur content.In comparison withlow-sulfur calcined coke with the sulfur content of 1.027%,the high-sulfur calcined coke with sulfur content of 4.55%shows the increased average bending strength from 6.39 MPa to 9.55 MPa,resulting in a performance improvement of 49.5%.Additionally,the average compressive strength increased from 26.38 MPa to 35.16 MPa,leading to a performance enhancement of 33.3%.This can be attributed to the oc-currence of cross-linking reactions between sulfur and binder coal pitch during high-temperature kneading and molding stages,which form network structures among chain segments;subsequently,carbonization of these chain segments during subsequent bakting stages results in a carbon network structure with improved mechanical properties.
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