Patent ID: 6391088
Filing Date: 2002-05-21
Classification: C21B,C22B,Y02P,Y02W,Y10S

Abstract:
A process for thermal treatment of residual materials container oil and iron oxide in a multiple-hearth furnace with several hearths one above the other, in which the residual materials containing oil and iron oxide are mixed with a solid reducing agent, introduced continuously into the multiple-hearth furnace, charged on a top hearth and gradually transferred to lower hearths, the residual materials containing oil and iron oxide are dried on the top hearths, the oil subsequently evaporated and pyrolised, a gas containing oxygen is injected into the multiple-hearth furnace and reacts with part of the reducing agent to form reduction gas, the reduction gas reacting with the iron oxides to form directly reduced iron, and the latter being discharged together with residues of reducing agents in the area of the bottom hearth of the multiple-hearth furnace.