基于n(Fe_2O_3)/n(CaO)的铁矿粉烧结液相流动性测定方法

Determination method of iron ore liquid phase fluidity index during sintering based on n(Fe_2O_3)/n(CaO)

针对以碱度(R=w(CaO)/w(SiO_2),w为质量分数)控制混合料CaO的添加量的铁矿粉液相流动性检测方法(R值法)在评价SiO_2质量分数不同的铁矿粉时结论与烧结生产存在差异的问题,提出以混合料铁钙的物质的量比(n(Fe_2O_3)/n(CaO))控制CaO添加量的铁矿粉液相流动性检测方法(N值法)。分别以化学纯试剂和铁矿粉为原料,对比研究了R值法和N值法对液相流动性指数检测结果的影响;并基于2种检测结果进行优化配矿—烧结杯试验。研究结果表明:R值法测得液相流动性指数与铁矿粉中SiO_2质量分数有明显的线性正相关关系,掩盖了铁矿粉真实的液相流动特性;N值法可以显著减小SiO_2含量对铁矿粉液相流动性指数的影响。基于N值法的优化配矿—烧结产质量指标与R值法相比,成品率、利用系数、转鼓强度分别提高4.62%,0.11 t/(m^2·h)和1.91%,固体燃耗降低1.96 kg/t。

The liquid phase fluidity indexes of iron ores are generally tested by controlling the basicity(R=w(CaO)/w(SiO2))of mixture(R value method).In order to solve the problem that the liquid phase fluidity indexes of iron ores with different SiO2 contents are inconsistent with the sintering actual production,a new improved method based on n(Fe2O3)/n(CaO)was proposed to add CaO(N value method).The effects of R value method and N value method on liquid phase fluidity indexes were studied by using pure chemical reagent and iron ores as raw materials.Based on these results,the optimizing ore blending-sintering pot tests were investigated.The results show that the liquid phase fluidity indexes measured by R value method have obvious linear positive correlation with SiO2 mass fraction of iron ores,which can not really reflect the liquid phase fluidity indexes of iron ores.N value method can significantly reduce the effect of SiO2 content on the liquid phase fluidity indexes.Compared with optimizing ore blending-sintering based on R value method,the sintering yield,productivity and tumbler strength of optimizing ore blending-sintering based on N value method are increased by 4.62%,0.11 t/(m2·h)and 1.91%respectively,while the solid fuel consumption reduces by 1.96 kg/t.