Coke is a high-carbon material and low impurities used as fuel.

Coke is a carbonate solid derived from low-ash and low-sulfur bituminous coals. Coal coke is gray, hard, and porous, although the natural coke is same as coal coke, but the most commonly used coke is human-made coke. Special coals are used to produce metallurgical coke and the properties of coal determine the properties of coke produced. The inorganic coal material, sterile, remains in the coke as ash, affecting the performance of the furnace.

Ash in the coke increases the consumption of coke and limestone in the blast furnace and reduces the capacity of coke batteries.

Coke is one of the most expensive raw materials consumed in the iron production process, with about half a ton of coke consumed per ton of raw iron in the blast furnace, and since more than 70% of the world’s steel is produced through iron production. Coke is an important and particular raw material in industries and economic.

Metallurgical coke is a porous material used in blast furnaces and one of the major uses of coke in the metallurgical industry. Coke in the blast furnace has various roles in supplying energy, revitalizing iron ores, creating pores for the passage of reduce gases and carbonization of cast iron. Coke is also used as a fuel and reducer in the cupola furnace. It should be noted that coke is also used in the casting industry.

Coke contains a percentage of sulfur and phosphorus, so the most important factor for the introduction of sulfur and phosphorus into the steel production process is coke.