本文借助于一系列气相——熔渣平衡试验的数据,对 CaO-SiO_2-Al_2O_3渣中氮的行为进行了研究。研究表明、氮在渣中的溶解并不是与自由氧离子作用、而是与渣中 SiO_2、Al_2O_3网络结构作用,形成新的 Si-N 或 Al-N 网络而进入渣中。本文获得了渣中 Si_(0.75)N、AIN 的活度系数经验计算公式和熔渣氮容量的经验计算公式,为选择适宜的合成渣组成进行炉渣脱氮提供了依据。 In this paper, the behavior of nitrogen in CaO-SiO_2-Al_2O_3 slag was studied by means of a series of data of gas-slag balance test. The results show that the dissolution of nitrogen in the slag does not interact with the free oxygen ions but with the structure of SiO_2 and Al_2O_3 in the slag and forms a new Si-N or Al-N network into the slag. In this paper, empirical formulas of activity coefficient of Si_ (0.75) N and AIN in slag and experience formula of slag nitrogen capacity were obtained, which provided the basis for selecting proper slag composition for slag denitrification.