Method for the melting of pig iron with the recirculation of...

Details Method for the melting of pig iron with the recirculation of... Method for the melting of pig iron with the recirculation of...

C - Chemistry, Metallurgy

21

B

C21B 5/00 (2006.01) C21B 5/06 (2006.01) C21B 13/00 (2006.01) C21B 13/14 (2006.01)

Patent

CA 2715525

A method for the melting of pig iron in a blast furnace (1) operated with oxygen or in a melt-reduction plant, with a reduction region, the purified crude gas (GG, EG) discharged from the reduction region being recirculated into the reduction region with the addition of hydrocarbons. According to the invention, there is provision for the purified crude gas (GG, EG) to be mixed with hydrocarbons and to be blended with reduction gas (REDG) which has a temperature of above 1000°C and is generated by the partial oxidation of hydrocarbons by means of oxygen gas having an oxygen content of above 90% by volume, in order to form a recirculation gas (REZG) with a temperature of above 800°C, and for the recirculation gas (REZG) to be recirculated into the reduction region according to an auto-reforming process.

L'invention concerne un procédé pour fondre de la fonte dans un haut-fourneau (1) fonctionnant à l'oxygène ou dans une installation de réduction par fusion, avec une zone de réduction, sachant que le gaz brut épuré (GG, EG) évacué de la zone de réduction est recyclé dans la zone de réduction en y ajoutant des hydrocarbures. Selon l'invention : le gaz brut épuré (GG, EG) est mélangé à des hydrocarbures, puis est mélangé à du gaz de réduction (REDG), qui présente une température supérieure à 1000°C et qui est produit par oxydation partielle d'hydrocarbures au moyen d'oxygène gazeux à teneur en oxygène supérieur à 90% (en volume), pour former un gaz de recirculation (REZG) de température supérieure à 800°C ; et le gaz de recirculation (REZG) est recyclé dans la zone de réduction après un processus d'auto-reformage.

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