Abstract
The paper describes the dissolution mechanisms of lime into liquid and foaming slags relevant to the BOF process. Two different master slags are employed, representing two different periods of the converter process: an early stage where the FeO content is fixed to 45 wt pct, and a later stage where the FeO content is fixed to 25 wt pct. For these master slags, the ratio between CaO/SiO2 is varied to examine the effect of basicity on lime dissolution. Calcium silicates are formed and peeled off, or partially peeled off, from the interface between the lime cube and the slag in all cases. The main difference for the dissolutions in pure liquid slag and foaming slag is the controlling step for dissolution. In liquid slag, the controlling mechanism is the removal of the calcium silicate layers, while in foaming slag, the controlling mechanism is the contact area between the lime and the liquid slag phase of the foam. The strong convection in the foam enhance the dissolution process, in some cases, the lime even dissociates into small pieces.
Highlights
THE dissolution of lime into BOF slags has been the topic for several researchers and is of great interest for the steel industry.[1,2,3,4,5,6,7,8,9,10,11,12,13,14] The dissolution of lime and the increase of slag basicity enhances the dephosphorization process
In view of this change in slag composition, two different master slags were studied in this paper, one representing the early period where the FeO content was fixed at 45 wt pct, and a later stage where the FeO content was fixed at 25 wt pct
All slags were utilized in the liquid slag experiments, while only slags A, B, C, and D were chosen for the foaming slag experiments, since the foaming in the BOF process starts appreciably after lime has started to dissolve into the slag
Summary
THE dissolution of lime into BOF slags has been the topic for several researchers and is of great interest for the steel industry.[1,2,3,4,5,6,7,8,9,10,11,12,13,14] The dissolution of lime and the increase of slag basicity enhances the dephosphorization process. A very acidic slag would increase the size of the silica ions and increase the viscosity, which in turn has shown to decrease the foaming ability of the slag.[15,16]. The industry is interested in good data of the lime dissolution to develop/improve their process models for better process control
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