Method and apparatus for producing reduced iron

C - Chemistry – Metallurgy – 21 – B

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C21B 13/10 (2006.01) C22B 1/16 (2006.01) F27D 7/06 (2006.01)

Patent

CA 2521321

A method for producing reduced iron wherein a raw material feed step of charging a raw material containing a carbonaceous reducing agent and an iron oxides containing material into a rotating hearth furnace, a heating and reduction step of heating said raw material and reducing iron oxides in said raw material, to form reduced iron, a melting step of melting said reduced iron, a cooling step of said molten reduced iron, and a discharging step of discharging said cooled reduced iron to the outside of the furnace are successively carried out in the direction of the movement of the hearth, which comprises providing, in the above furnace, a flow rate adjusting partition wall for controlling the flow of a gas in the furnace, to thereby form the flow of the gas in the furnace in the cooling step along the direction of the movement of the hearth. The above method allows the suitable control of the flow of the outside air (an oxidizing gas) entering from a raw material feeding means, a discharging means or the like, which leads to the solution of a problem that the reduction rate is decreased by said outside air.

L'invention concerne la production de fer réduit qui comprend un stade d'alimentation de matières premières contenant un agent réducteur de substances carbonées et un matériau à base d'oxydes de fer dans un four rotatif, ainsi qu'un stade de réchauffement et de réduction desdites matières premières et de réduction d'oxydes de fer dans lesdites matières premières qui permet d'obtenir du fer réduit, un stade de fusion dudit fer, un stade de refroidissement dudit fer réduit et un stade de déchargement du fer réduit et refroidi à l'extérieur du fourneau. Ces stades sont successivement mis en oeuvre dans le sens de mouvement du foyer du four. On a ménagé dans le four une paroi de séparation servant à ajuster le débit, qui permet de former un flux de gaz dans le four au stade de refroidissement dans le sens de mouvement du foyer. Ce procédé permet de réguler le flux d'air environnant (d'un gaz oxydant) pénétrant depuis de moyen d'alimentation en matière première, un système de déchargement ou similaire, ce qui permet de résoudre le problème de diminution du débit par l'air environnant.

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