论文部分内容阅读
The chromium recycling from the stainless steel dust of an argon-oxygen decarburization(AOD)furnace during a hot metal pretreatment process was investigated.Experiments at different temperatures or with different amounts of AOD dusts were carried out in a laboratory furnace equipped with MoSi_2 heating elements and subsequently industrial experiments were conducted in a stainless steelmaking factory,in order to study the thermodynamic mechanism of C and Si reacted with Cr_2O_3 to get Cr from AOD dust.The results showed that the reaction between C and Cr_2O_3 occurred below 1 572.18 K.Although its reducing ability was weaker than that of Si,C enabled the Cr in Cr_2O_3 in the AOD dust to be recycled using the Si in the slag.By combining the AOD dust added in an earlier stage,the hot metal pretreatment slag added in a later stage could not only recycle Cr from AOD dust but also remove Si,S,and P.Higher hot metal temperatures resulted in higher Cr content and lower remained P concentration in the molten iron.
The chromium recycling from the stainless steel dust of an argon-oxygen decarburization (AOD) furnace during a hot metal pretreatment process was investigated. Experiments at different temperatures or with different amounts of AOD dusts were carried out in a laboratory furnace equipped with MoSi_2 heating elements and successively industrial experiments were conducted in a stainless steelmaking factory, in order to study the thermodynamic mechanism of C and Si reacted with Cr_2O_3 to get Cr from AOD dust. The results showed that the reaction between C and Cr_2O_3 occurred below 572.18 K. Although its reducing ability was weaker than that of Si, C enabled the Cr in Cr 2 O 3 in the AOD dust to be recycled using the Si in the slag. BY combining the AOD dust added in an earlier stage, the hot metal pretreatment slag added in a later stage could not only recycle Cr from AOD dust but also remove Si, S, and P. Heigher hot metal temperatures resulted in higher Cr content and lower remained P concentration in the molten iron.