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Effect of CaO on Dephosphorising Ability of Deoxidation Slag for Effective Utilisation of Phosphorus in Steel

机译:CaO对钢中磷有效利用脱氧渣脱磷能力的影响

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Recent proposal of utilisation of impurities in steel requires preservation of phosphorus in molten steel during its refining process. To know the phosphorus absorbing ability of deoxidation by-product slag hav ing CaO, the phosphorus partition has been investigated between the MnO-SiO_2-Fe_tO-CaO-MgO-P_2O_5 slag and molten iron in this study. The phosphate capacities (C_(pch)~(3-)) for the present slag having CaO con tent from 4.73 to 19.6 mass% have been determined to be from 2.22x10~(15) to 1.25x10~(17) at temperatures from 1 843 to 1 923 K. Focused on the slag basicity, a thermodynamic discussion gives the capacity as functions of optical basicity (Λ) and temperature (T) as follows; logC_(PO_4)~(3-) = (11 300Λ + 54560)/T+ 18.30Λ-27.43 Estimated values of phosphorus distribution ratio ranges from 0.0003 to 0.008 between the present slags and molten iron in practical operations according to empirical phosphate capacities. CaO is useful to improve phosphate capacity of this system to some extent.
机译:利用钢中杂质的最新提议要求在精炼过程中将钢水中的磷保存起来。为了了解具有CaO的脱氧副产物炉渣对磷的吸收能力,本研究对MnO-SiO_2-Fe_tO-CaO-MgO-P_2O_5炉渣与铁水之间的磷分配进行了研究。已确定,在CaO含量为4.73至19.6质量%的情况下,本炉渣的磷酸盐容量(C_(pch)〜(3-))在温度为90°C时为2.22x10〜(15)至1.25x10〜(17)。 1 843至1 923K。热力学讨论集中在炉渣碱度上,给出了光碱度(Λ)和温度(T)的函数。 logC_(PO_4)〜(3-)=(11300Λ+ 54560)/ T +18.30Λ-27.43在实际操作中,根据经验的磷酸盐容量,当前矿渣与铁水之间的磷分布比的估计值范围为0.0003至0.008。 CaO在某种程度上有助于提高该系统的磷酸盐容量。

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