High Carbon Calcined Petroleum CokeThe carburant we research and produce are ... .com, grey iron and steel .With the property of high carbon ,low sulphur, low nitrogen, less harmful impurity, good absorption effect, no returned ... speed2.Calcined the Petroleum coke under high temperature, with the feature of high carbon ,low sulphur, low harmful impurity, high absorption rate.3.Graphitization is perfect ...