100t钢包精炼渣系优化选择及应用

Optimization and application of 100t ladle refining slag system

通过对精炼渣的熔点、组元活度、黏度、理论硫分配比的分析,研究出高吸附夹杂物能力同时兼顾脱硫能力的LF精炼渣系:w(CaO)=55%~59%,w(Al_2O_3)=27%~32%,w(SiO_2)=5%~10%,w(MgO)≤8%,w(FeO+MnO)<1%。通过物料平衡计算,设计100 t钢包精炼的造渣方案,并在100 t LF精炼炉进行试验。试验结果显示,造渣方案满足新渣系的要求,同时新渣系在满足冶炼脱硫要求的情况下,其去除夹杂的能力显著提高,B类和D类夹杂物评级均在1.0级以下,成品全氧质量分数控制在0.000 6%~0.001 1%。

LF refining slag has an important role in LF refining process. Through the analysis of melting point, component activity, viscosity and sulfur distribution ratio, the refining slag of adsorbing inclusion ability and high desulphurization capacity had been designed. The main compositions of the refining slag were w（CaO） = 55 % - 59 %, w （Al2O3） = 27 % - 32 %, w （SiO2） = 5 % - 10 %, w（MgO）≤8 %, w（FeO ＋ MnO）〈1%. By material balance calculation, the slagging process had been devised and had been tested in 100 t ladle. The result showed that the composition of the slag can reach the target, and cleanliness of the product was obviously improved. The inclusion level of the product was all less than 1.0 grade, and the total oxygen mass fraction was between 0. 001） 6 % and 0.001 1% ,which was less than that of the old slag.