加拿大铁精粉对烧结体固结强度的影响及其改善方法

加拿大铁精粉由于具有铁品位高、脉石及有害元素含量低等优点,其在烧结过程中使用具有有利条件。采用微型烧结法考察了该铁精粉配比对烧结体固结强度的影响及其机理,并研究了4种富矿粉的细粉液相流动性和粗颗粒吸液性。在此基础上,通过固结试验,探究并验证了烧结体固结强度的改善方法。研究结果表明,将该铁精粉配入混匀料中,大幅降低了黏附粉偏析碱度,减弱了液相流动性,因此恶化了烧结体的固结强度。在固定碱度的条件下,高硅铁矿粉有较高的细粉液相流动性,低气孔率铁矿粉有较弱的粗颗粒吸液性。在配加该铁精粉的条件下,选择高液相流动性铁矿粉、弱吸液性铁矿粉、强吸液性铁矿粉粗颗粒分加制粒均能有效改善烧结体的固结强度。

Effect of Canadian iron concentrate on bonding strength of sinter body and thereof improvement method

The Canadian iron concentrate has a high ferrous grade and low contents of gangue and harmful elements, which provides a favorable condition for its use during the sintering process. The effect of the iron concentrate on the bonding strength of the sinter body and the influencing mechanism were investigated through the micro sintering method. The liquid phase fluidity of the fines and the liquid absorbability of the coarse particles were studied on four kinds of iron ore fines. Based on this, the improvement method for the bonding strength of sinter body was explored and verified via bonding tests. The results show that blending the iron concentrate in ore blends decreases the separation basicity of adhering fines and weakens the liquid phase fluidity, hence deteriorating the bonding strength of the sinter body. High silica iron ore fines have a high liquid phase fluidity of the fines under a fixed basicity, and the low porosity iron ore fines weaken the liquid absorbability of the coarse particles. Under blending the iron concentrate in ore blends, using the high liquid phase fluidity iron ore fines, weak liquid absorbability iron ore fines, and large particle divided adding for strong liquid absorbability iron ore fines can effectively improve the bonding strength of the sinter body.