Thermodynamic Study of Secondary Refining Slag for Steelmaking

为生产高纯度钢，开发了各种钢的脱磷脱硫助熔剂。实际使用的助熔剂是cao基助熔剂，在二次炼钢过程中采用铝对钢进行脱氧。在此过程中形成CaO-Al_2O_3渣。本文首先研究了CaO-Al_2O_3、CaO-Al_2O_3- mgo、CaO-Al_2O_3- sio_2和CaO-Al_2O_3- caf_2炉渣在1823 ~ 1923K温度下的硫化物容量和硫溶解度，探讨了这些炉渣在二次炼钢过程中的脱硫能力。其次，在1823至1923 K的温度下测定了这些炉渣中成分的活度，以估计这些炉渣和液态铁之间的平衡氧分布。根据所得结果，在假定钢用铝脱氧的情况下，对钢渣和钢液之间的平衡硫分布进行了评价。，并与实验观察结果进行了比较。

Various kinds of fluxed for dephosphorization and desulphurization of steel have been developed to produce high purified steel. Practically used flux is CaO-based flux and steel is deoxidized with aluminum in secondary steelmaking proces. As the result, CaO-Al_2O_3 slag is formed in the process. In the present work, at first, the sulphide capacities and sulphur solubility for CaO-Al_2O_3, CaO-Al_2O_3-MgO,CaO-Al_2O_3-SiO_2 and CaO-Al_2O_3-CaF_2 slags were studied at 1823 to 1923K to discuss the desulphurization ability of these slags in the secondary steelmaking process.Secondary, the activities of the constituents in these slags were determined at 1823 to 1923 K to estimate the equilibrium oxygen distributed between these slags and liquid iron.From the results obtained, the equilibrium sulphur distribution between these slags and liquid steel was evaluated on the assumption that the steel would be deoxidized with aluminum., and these were compared with the experimentally observed results.