基于粘结强度特征数的烧结矿强度评价方法

烧结矿的强度主要取决于含铁矿物的强度、粘结相自身的强度以及粘结相与含铁矿物间的粘结强度。研究表明粘结相与含铁矿物间的粘结强度是烧结矿强度的主要制约因素。将粘结强度与能满足工厂生产要求标准的烧结矿粘结强度(12.58 MPa)的比值定义为粘结强度特征数,并用其评价烧结矿的整体强度。同时,结合烧结矿的微观结构对烧结矿强度进行研究。结果表明,与粘结相自身微观结构相比,粘结相与含铁矿物界面的微观结构较为疏松;固液两相之间的冷收缩系数不同,粘结相与含铁矿物之间易形成内应力,不利于粘结强度的提高。因此,粘结强度满足一定要求时,烧结矿的强度就能满足生产要求。

Bonding strength characteristic number:A new method to evaluate sinter strength

Sinter strength is mainly dependent on strength of iron-bearing minerals, bonding phase itself and bonding strength between bonding phase and iron-bearing minerals. Research indicates that the bonding strength between bonding phase and iron-bearing minerals is the major dependent factort of sinter strength. The ratio of bonding strength to sinter bonding strength meeting production requirements (12.58 MPa) is defined as bonding strength characteristic number to evaluate sinter strength. At the same time, the sinter strength is studied based on sinter microstructure. The results show that, compared with the microstructure of bonding phase itself, that of the interface between bonding phase and iron-bearing minerals is looser, on the other hand, due to the different cold contraction coefficient of solid and liquid phases, the internal stress is easily formed between bonding phase and iron-bearing minerals, which is not conducive to the improvement of bonding strength. Therefore, when bonding strength meets certain requirements, sinter strength can meet production requirements.