The Krupp Sponge Iron Process Production and Utilisation of Metallized Materials

Next to ore, fuel is the important factor governing the cost of producing primary iron.

In the blast furnace process, coke with special meta-llurgical properties is the basic source of heat. Its production requires the availability of coking coal. The direct reduction processes, conducted in rotary kilns, permit, however, the use of non-coking bituminous coal & anthracite and are capable of being fired with gas or oil if this appears to be appropriate.