... Trading Co.,Ltd is one of the best calcined petroleum coke manufacturers and suppliers in China, you can get calcined ... :High-CarbonGrade:Industrial GradeOrigin:Hebei, China Calcined Petroleum Coke comes from delayed coke which extracted from oil refinery. Although Calcined Petroleum ... little bit higher level of sulfur and nitrogen than pitch coke, the price advantage still makes it widely used during ...