材料期刊网

本次对高炉内氟的变化的研究,系在石景山钢铁厂内11M~3高炉上进行,试验结果证实了前一文中关于1M~3实验高炉内氟变化情况的结论,即煤气中氟与石灰或石灰石间接近平衡,而与温度的分布有很大关系。本次度验取得炉料样品较多,因此对氟从矿石中和熔渣中的挥发机理有所阐明,而对氟在高炉内的变化获得了较为完整的概念。

In a previous paper, data on the movement of fluorine during the smelting of Pao-Tou ironore in a 1 M~3 experimental blast-furnace has been reported. This paper provides further infor-mation on the mechanism of volatilization of fluorine and its movement in a 11 M~3 blast-furnaceduring two campaigns of smelting of the same ore. The conclusion of the previous paper is confirmed by the results of the present investigation inthat the fluorine content of the blast-furnace gas depends primarily on temperature, and approachesequilibrium with lime or limestone in the furnace charge. It has also been found that this state-ment holds true only at those temperatures when a slag phase has not been formed, and that thefluorine content of the furnace, gas decreases rapidly at the appearance of a liquid slag phase. From the analysis of the ore samples taken at different levels of the blast-furnace, it has beenfound that the CaO/F ratio increases as the ore moves downward, and that there is a parallelrelationship between the SiO_2 and the F contents of the ore samples. These facts seem to indicatethat fluorine volatilizes from the ore chiefly as SiF_4, which subsequently reacts with H_2O in thefurnace gas to form HF and SiO_2. The mechanism of volatilization of fluorine from the liquid slag is also briefly discussed.