foundry coke is the main fuel for melting iron. The function of foundry coke is to raise the temperature of the furnace to melt the iron into a liquid state. At the same time, the crushing strength and the strength after thermal reaction of the foundry coke can ensure its good supporting effect, which can play a supporting role in the furnace body to maintain good permeability and enhance the oxygen circulation in the furnace. Therefore, the foundry coke have large particle size, low reactivity, long constant temperature, small porosity, high density and sufficient impact strength. On the other hand due to different production processes and product uses, the foundry coke also has obvious low ash and low sulfur characteristics.