转炉渣中碱度变化对结构单元的影响

THE INFLUENCE OF VARIOUS BASICITY ON STRUCTURAL UNITS OF CONVERTER SLAG

依据分子离子共存理论模型,对唐钢炼钢CaO-SiO_(2)-FeO-MgO-MnO-Al_(2)O_(3)-P_(2)O_(5)炉渣1350℃的组成结构单元进行了计算,得到硅酸钙盐和磷酸钙盐的摩尔分数,同时对磷的富集度进行了计算。结果显示:CaO·SiO_(2)、3CaO·2SiO_(2)和2CaO·SiO_(2)的摩尔分数随碱度的增加而逐渐降低,3CaO·SiO_(2)的摩尔分数随碱度的增加而逐渐增加,3CaO·P_(2)O_(5)的摩尔分数随钢渣碱度的增加而逐渐增加,3FeO·P_(2)O_(5)的摩尔分数随钢渣碱度的增加而逐渐降低;2CaO·SiO_(2)的磷富集度最大,CaO·SiO_(2)的磷富集度其次,碱度在1.0增加到3.0,2CaO·SiO_(2)的磷富集度从0.75增加到0.81,CaO·SiO_(2)的磷富集度从0.176降低到0.147,2CaO·SiO_(2)是钢渣中磷的主要富集场所。

Based on the molecular ion coexistence theory model,the structural units of CaO-SiO_(2)-FeO-MgO-MnOAl3O3-P_(2)O_(5)slag in Tangsteel steelmaking process were calculated at 1350℃,and the mole fraction of calcium silicate and calcium phosphate were obtained.At the same time,the enrichment degree of phosphorus was calculated.The results show that the mole fraction of CS,C3S2,and C2S gradually decrease with the increase of alkalinity,the mole fraction of C3S gradually increase with the increase of alkalinity,the mole fraction of C~3P gradually increase with the increase of steel slag alkalinity,and the mass action concentration of F3P gradually decrease with the increase of steel slag alkalinity.C2S has the highest phosphorus enrichment,followed by CS,with alkalinity increasing from 1.0 to 3.0,C2S increasing from 0.75 to 0.81,and CS decreasing from 0.176 to 0.147.C2S is the main site for phosphorus enrichment in steel slag.