Some laboratory studies have been done to discuss the possibility of copper, tin and zinc removal from molten steel scrap. At first, the equilibrium copper distribution ratio between FeS-based sulfide flux and Fe-Csat. melt at 1673 K is reviewed. The copper distribution ratio, LCu, increases with the addition of alkaline- or alkaline earth sulfide into FeS and reaches the maximum, while the sulfur content in metal decreases at the same time. The maximum value of LCu of approximately 20-30 is obtained in FeS-M2S (M: Li, Na, and K) and FeS-MS (M: Sr and Ba) fluxes. In the second, the vaporization rate of zinc from liquid Fe-Zn alloy is discussed at 1873 K by impinging Ar onto the surface of inductively stirred melt. The evaporation rate of zinc is found to be mainly controlled by the liquid phase mass transfer on the condition. The evaporation rate of tin from Fe-S-Csat. bath is also studied at 1673 K under reduced pressure. The evaporation rate of tin is controlled mainly by the gas phase mass transfer and becomes drastically faster by adding sulfur in the metal, and it indicates that tin dissolved in liquid iron could be removed by evaporation in the form of SnS. The removal rate of tin, zinc or other residual elements from molten steel in the conventional practical operations or vacuum treatment is also discussed based on the present results.
|Number of pages||9|
|Journal||Steelmaking Conference Proceedings|
|Publication status||Published - 1996|
|Event||Proceedings of the 1996 79th Steelmaking Conference - Pittsburgh, PA, USA|
Duration: 1996 Mar 24 → 1996 Mar 27