Cold start-up method for a direct smelting process

Details Cold start-up method for a direct smelting process Cold start-up method for a direct smelting process

C - Chemistry, Metallurgy

21

B

C21B 13/00 (2006.01)

Patent

CA 2606800

A method of cold starting a molten bath-based direct smelting process for producing molten iron in a vessel (3) is disclosed. The method includes a step of preheating the vessel before supplying solid feed materials into the vessel. The method also includes a subsequent step of supplying an oxygen- containing gas and solid feed materials including material for forming slag, iron-containing feed material, and carbonaceous material into the vessel and generating heat and forming a bath of molten material that includes molten iron and molten slag in the vessel. This step includes supplying feed materials to promote formation of molten slag over molten iron in an early stage of developing the molten bath

L'invention concerne une méthode de démarrage à froid d'un procédé de fusion directe à partir d'un bain fondu pour la fabrication de fer fondu dans une cuve (3). La méthode inclut une étape de préchauffage de la cuve avant l'introduction de matières premières solides dans cette cuve. La méthode inclut également une étape ultérieure d'introduction dans la cuve d'un gaz contenant de l'oxygène et de matières premières solides incluant un matériau pour former des scories, une matière première contenant du fer et, un matériau carboné, de génération de chaleur et de formation d'un bain de matériau fondu incluant du fer fondu et des scories fondues dans la cuve. Cette étape inclut l'introduction de matières premières pour favoriser la formation des scories fondues par rapport au fer fondu au premier stade de développement du bain fondu.

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