材料期刊网

采用已知的活度数据,通过三种理論方法的計算,卽(1)氧化物分解压力P_(O_2),(2)铁液內与各元素平衡的[O]量,及(3)氧化的反应自由能ΔF,对鉄液內磷、碳及其他元素氧化的順序进行了分析和研究。文中对及計算P_(O_2)的不正确之处,及对計算鉄液內与磷、碳平衡的[O]量欠妥之处提出了討論。理論計算証明:(1)脫磷是一界面反应,沒有适当成分的炉渣是不可能进行的;(2)迅速造成高氧化鈣及高氧化铁炉渣,在較低溫度有可能在托馬斯法吹炼中使磷与碳同时氧化;(3)增加CO的分压能使碳的氧化受抑制而使磷先于碳被氧化。

The sequence of oxidation of phosphorus, carbon and other elements in molten iron bath during steelmaking were analyzed thermodynamically by means of three methods of calculation, namely: (1) calculation of the dissociation pressure P_(o_2) of oxides; (2) calculation of the [O] content in iron bath in equilibrium with the respective elements; and (3) calculation of the free energy change of the reaction of oxidation. All calculations were made with free use of activity data. The previous works of and for calculation of P_(o_2), and that of for calculation of [O] content in iron bath in equilibrium with phosphorus and carbon were reviewed, and their impropriety and errors in calculation were discussed. It has been shown that: (1) Dephosphorization is a reaction occurring between boundary layers of liquid phases, and takes place only in the presence of a molten slag of proper composition; (2) By quick formation of a highly calcareous and ferruginous slag, it is possible in the Thomas blow, preferably at comparatively low temperatures, to eliminate phosphorus simultaneously with carbon; and (3) Increase in the partial pressure of CO would depress the oxidation of carbon and facilitate the preferential oxidation of phosphorus.