process and apparatus for the direct reduction of iron ore with optimized injection of reducing gas

摘要

Method and apparatus for the direct reduction of mineral iron inside a vertical reduction furnace (10) of the type with a gravitational flow, wherein the reducing gas flows counter to the material introduced into the furnace, comprising the following steps: the mineral iron is fed into said furnace (10) from above, a mixture of gas at high temperature is injected and the reduced mineral is removed from said furnace (10), said mixture of gas being introduced into said furnace (10) by means of first injection means (20a) located peripherically on the outer wall of said furnace (10) and at the same time said mixture of gas being introduced into said furnace (10) by means of second injection means (20b, 20c, 25) located inside said furnace (10).