Stabilization of Stainless Steel Slag via Air Granulation

Preface for Thematic Section: Slag Granulation

“…The work reported by So et al [1] was aimed at the application of air blasting to granulation of stainless-steel slag and suppress dust formation through dicalcium silicate phase transformation. The results of this pilot-scale work, granulating at about 30 kg/min, confirmed that formation of the "dusting phase" (γ-dicalcium silicate) in the solidified slag, and hence, a very stable product was successfully produced.…”

Numerical Modeling of Argon‐Oxygen Decarburization Slag Cooling

“…During slow cooling, the AOD slag undergoes a phase transformation of β-dicalcium silicate to γ-dicalcium silicate at approximately 773-723 K (500-450 C), resulting in disintegration of the slag due to the associated 10-12% volume expansion. [15] Consequently, different chemical stabilization techniques have been proposed. [16] Borate additions are a well-known stabilization method, [16,17] whereas nonboron additions such as MgO, Al 2 O 3 , Fe 2 O 3 , BaO, K 2 O, P 2 O 5 , and Cr 2 O 3 have been reported to stabilize stainless steel slags.…”

“…[16] Furthermore, the properties of the slag are affected by the cooling method. [18][19][20][21] The simplest method for AOD slag cooling is cooling in an ambient atmosphere in a slag yard, [15] but other methods, such as water cooling [22] or airgranulation, [15] have been proposed for achieving a faster cooling rate. The literature on modeling the cooling of AOD slags remains scarce.…”