中文摘要：

以六元Ca O-Si O2-Fe O-P2O5-Fe_2O_3-Al_2O_3炼钢渣系为研究对象,结合热力学计算和实验检测,分析（Al_2O_3）和二元碱度B综合变化对该六元渣系中磷酸盐富集行为的影响.结果表明：炼钢炉渣中生成游离C2S含量对磷酸盐富集相n C2SC3P内的（P2O5）至关重要.该渣系中增加Si O2会降低总的C2S生成量,增加Al_2O_3可促进钙铝黄长石C2AS相生成,降低游离C2S（f-C2S）的量,进而影响磷酸盐的富集.六元Ca O-Si O2-Fe O-P2O5-Fe_2O_3-Al_2O_3炼钢炉渣获得较好磷酸盐富集程度,渣中二元碱度B和Al_2O_3含量需满足的耦合关系为：（%Al_2O_3）=-27.70＋21.62B,（Al_2O_3）〈20.0%,B〉1.3.

英文摘要：

A comprehensive effect of Al_2O_3 content and binary basicity B on the enrichment behavior of phosphates in rapidly quenched Ca O- Si O2- Fe O- P2O5- Fe_2O_3- Al_2O_3 steelmaking slags was investigated through thermodynamic calculations and experimental determination. It is found that the determined mass percentage of P2O5 in the phosphate-enriched phase n C2S-C3 P depends on the forming of free C2 S in the steelmaking slags and increasing the Si O2 content can result in an obviously decreasing tendency of formed C2 S. Adding Al_2O_3 as a dilute agent for decreasing the viscosity and melting point of the steelmaking slags can be easily bonded with free C2 S to form a gehlenite（ C2AS） solid solution. Thus,adding Al_2O_3 in the steelmaking slags can decrease the amount of free C2 S in the steelmaking slags,which affects phosphate enrichment. In order to obtain a greater phosphate enrichment in the steelmaking slags,a coupling relationship between the binary basicity B and the mass percentage of Al_2O_3 in the initial steelmaking slags should be kept as（ % Al_2O_3） =- 27. 70 ＋ 21. 62 B under the conditions of（ Al_2O_3） 〈20. 0% and the binary basicity B〉 1. 3.