P、Mn在BaO-BaF_2-MnO渣和Mn-Fe-C-P熔体间的平衡分配

Equilibrium Partition of P and Mn between BaO BaF 2 MnO Slags and Mn Fe C P Melts

在１６７３Ｋ下，通过给定化学组成的ＢａＯ－ＢａＦ２－ＭｎＯ熔剂和Ｍｎ（～６０％）－Ｆｅ－Ｃ（１．１８％～６．４０％）－Ｐ合金间的平衡实验，确定锰铁合金中碳含量的变化对磷分配比ＬＰ和锰分配比ＬＭｎ的影响。结果表明，锰铁熔体中存在着一个临界碳含量［％Ｃ］＊，它对应着最大的ＬＰ和最小的ＬＭｎ。热力学计算表明，在本实验条件下，氧位控制环节对临界碳的存在和位置起决定性作用。而对于给定化学组成的ＢａＯ基熔剂，其相应渣系的磷酸盐容量值和锰酸盐容量值变化不大，分别为ｌｇＣＰ＝２４．８０±０．１５，ｌｇＣＭｎ＝９．０４±０．２４，它们对ＬＰ、ＬＭｎ的临界转变现象影响不大。

The experiments of equilibrium between BaO BaF 2 MnO fluxes and Mn(～60 %) Fe C(1.18 %～6.40 %) P alloys were carried out at 1 673 K. The influence of carbon content on distribution ratio of P and Mn in ferro manganese melts was investigated. The obtained results show that a critical carbon content * exists in ferro manganese melts. The L P is the maximum and L Mn the minimum at *. The phosphate capacity C P and manganese capacity C Mn of the tested slags are lg C P=24.80±0.15 and lg C Mn =9.04±0.24 at 1 673 K, which is slight change for BaO based fluxes with fixed composition. The thermodynamical calculation shows that oxygen potential is a control step of oxidizing dephosphorization of ferro manganese and determines the existence and position of *.