Development of Heat Recovery System from Steelmaking Slag

Evaluation of roll dry granulation process on the high‐viscosity melt solidification and heat recovery

“…[1][2][3][4][5] The technology mainly consists of mechanical stirring, 4 rotating cup atomizer, [7][8][9][10] and single/twin roll. [11][12][13][14] Its technical process can be described as follows: (1) Firstly, the melt is broken into liquid films or droplets by aerodynamic force or mechanical force, in order to raise specific surface area and achieve rapid solidification. 13,14 (2) Then, the hightemperature solid particles are fed into a packed bed or fluidized bed for further cooling to a low temperature.…”

“…[11][12][13][14] Its technical process can be described as follows: (1) Firstly, the melt is broken into liquid films or droplets by aerodynamic force or mechanical force, in order to raise specific surface area and achieve rapid solidification. 13,14 (2) Then, the hightemperature solid particles are fed into a packed bed or fluidized bed for further cooling to a low temperature. 11,12,15,16 (3) Meanwhile, the steam and hot air generated therein can be applied to the production process or power generation.…”

“…Single/twin roll has been found to be a promising method for the rapid cooling of molten slag in recent research, [11][12][13][14] since it has the advantages of large treatment capacity and low unit energy consumption. Specifically, compared with mechanical stirring and rotating cup atomizer, single/twin roll utilizes rather than overcomes viscous force to granulate the melt.…”

“…Shigaki et al 11,12 and Tobo et al 13 have carried out a lot of research on the heat recovery from molten slag using the integrated system of single/twin roll and packed bed. Earlier, Ta et al 14 also investigated the heat transfer and structural strength of the roll, finding that the copper roll with spiral channel can ensure the rapid cooling of molten slag. All these studies confirmed that the technique has great potential to treat molten slag.…”

“…Dry granulation technology used in the rapid cooling and heat recovery of the melt has been widely concerned to avoid the above problems 1–5 . The technology mainly consists of mechanical stirring, 4 rotating cup atomizer, 7–10 and single/twin roll 11–14 . Its technical process can be described as follows: (1) Firstly, the melt is broken into liquid films or droplets by aerodynamic force or mechanical force, in order to raise specific surface area and achieve rapid solidification 13,14 .…”