A method for the low-temperature reduction of iron ore by means of a series of rotary kilns. The kilns are each about 5 ft (1.5 m) in diameter and 30 ft (9.1 m) in length. The first is used for preheating, the second for reduction, and the third for cooling the product. Pulverized coal is used, which makes it readily possible to control the combustion and to maintain constant temperature.