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粒级细小的精矿粉在烧结过程中对粘结液相的形成和行为具有重要影响。采用相图软件(FactSage~(T M)7.0)对Fe_2O_3-CaO-SiO_2渣系进行了计算,通过烧结试验对铁矿粉烧结液相行为受脉石的作用进行了研究。结果表明,SiO_2能明显提高烧结液相的量和流动行为,Al_2O_3也有一定的促进作用,MgO则会轻微抑制;同化性能好的铁矿粉形成的初始液相层较薄,有利于其扩散;烧结矿的粘结相和孔洞结构主要受液相行为和大颗粒矿粉自身致密度影响。
The fine-grained concentrate powder has an important influence on the formation and behavior of the binder liquid during the sintering process. The phase diagram of Fe_2O_3-CaO-SiO_2 slag was calculated by phase diagram software (FactSage ~ (T M) 7.0). The sinter test was used to study the effect of gangue on the liquid phase behavior of iron ore powder sinter. The results show that SiO_2 can significantly increase the amount and flow behavior of the sintered liquid phase. Al_2O_3 also has a certain promotion effect, and MgO slightly inhibits. The initial liquid phase formed by iron ore with good assimilation properties is thin, which is favorable for its diffusion. The binder phase and pore structure of sinter are mainly affected by the liquid phase behavior and the density of large-sized slag.