某高铝澳矿对烧结粘结相流动性及脆性矿物的影响

摘要：某澳洲具有高Al2O3含量，其铁矿粉价格低廉的特点，成为目前低成本烧结配矿所考虑的矿种之一。但是高Al2O3含量的铁矿粉会导致烧结矿的成品率和转鼓强度下降。为明确该高Al2O3含量澳洲铁矿粉对烧结粘结相的影响，使用微型烧结法和K值法，研究了在不同高Al2O3含量铁矿粉配比下粘结相的液相流动性及高铝脆性矿物的含量。研究结果表明,该高Al2O3含量铁矿粉最低同化温度较高且液相流动性很低。随着高Al2O3含量铁矿粉配比的增加，粘结相的液相流动性降低，高铝脆性矿物的含量升高。为减弱此不利影响，在高Al2O3含量铁矿粉混匀矿配矿结构的基础上，通过测定常用矿的反应性并采用增加高反应性铁矿粉配比的方法，明显提高了粘结相的液相流动性且降低了高铝脆性矿物的含量。

Effect of a high alumina Australia ore on fluidity and brittle minerals of sintering bonding phase

A high-alumina ore from Australia is cheap and conducive for low cost sintering. However, iron ore fines with a high Al2O3 content will result in a decrease in the yield of the sintered ore and the tumbler index of the sinter. In order to clarify the effect of high-alumina ore on sintering bonding phase, the micro-sintering method and K-value method were used to study the liquid phase fluidity and content of high-alumina brittle mineral of the bonding phase under different high alumina ore ratios. The results show that high-alumina ore has the lowest assimilation temperature and the lowest liquid phase fluidity. With the increase of the ratio of high alumina ore, the liquid phase fluidity of the bonding phase decreases and the content of high alumina brittle minerals increases. In order to weaken this effect, on the basis of ore-blending structure with high-alumina ore, liquid phase fluidity and high-alumina brittle mineral content is obviously improved by measuring the reactivity of common ore and increasing the ratio of high-reactivity iron ore.