Mn-Fe熔体的脱P过程及Mn-Fe熔体氧位的研究

Study on dephosphorization for ferromanganese melt and its oxygen potential in dephosphorization process

使用BaCO370%-MnO25%-(Fe2O3+BaF2)25%(质量分数)的熔剂对高炉Mn-Fe脱P时,最高脱P率(50%)对应的Fe2O3含量是8%;熔体中氧位和C的活度,Si的活度和Mn损的关系式分别为pO2×1012/Pa=-1.542+0.018×aC,pO2×1012/Pa=-1.284+1.366×aSi,pO2×1012/Pa=1.737+0.565×Δ犤Mn犦。使用BaCO370%-BaF210%-MnO25%-Fe2O315%熔剂对高炉Mn-Fe脱P时,最高脱P率(41%)和最高氧位(2.31×10-12Pa)对应的脱P时间为15min。脱P实验结果表明:脱P过程中Mn-Fe熔体的氧位是由熔体中Si-O反应控制的;脱P保Mn的最高氧位是1.737×10-12Pa。

When BaCO370%-MnO25%-(Fe2O3+BaF2)25% fluxes are used to dephosphorize for blast furnace ferromanganese, the maximum dephosphorization rate(50%) corresponds to Fe2O3 8% in flux ,the relations between the oxygen potential in ferromanganese melt and carbon activity , silicon activity as well as manganese loss (△) in the melt are ×1012/Pa=-1.542+0.018×aC,×1012/Pa=-1.284+1.366×aSi,×1012/Pa=1.737+0.565×Δ respectively. When blast furnace ferromanganese is dephosphorized by BaCO370%-BaF210%-MnO2 5%-Fe2O315% fluxes , the maximum dephosphorization rate (41%) and the highest oxygen potential(2.31×10-12 Pa) in ferromanganese melt correspond to 15 min treatment . The results of dephosphorization experiments show that the oxygen potential in ferromanganese melt is controlled by silicon-oxygen reaction in the melt. In order to dephosphorize for ferromanganese and to prevent manganese from oxidation the oxygen potential in ferromanganese melt has to be controlled at or under 1.737×10-12 Pa .