基于铁矿粉高温特性互补的烧结优化配矿

首先测定巴西、澳洲及中国的10种铁矿粉的高温特性,将其与实际生产统计所得的高温特性适宜区间比较可知:巴西矿的同化性偏低,澳洲矿偏高,中国精粉则相对接近适宜区间;有两种巴西矿、一种澳洲矿以及一种中国精粉的液相流动性适宜,一种巴西矿、一种澳洲矿以及两种中国精粉则偏低,一种澳洲矿和一种中国精粉的液相流动性稍高;澳洲矿的黏结相自身强度偏低,巴西矿和中国精粉则较为适宜,且中国精粉相对更高.在实验研究的基础上,提出基于铁矿粉高温特性互补而使混合矿高温特性指标适宜的烧结配矿新思路,并设计优化配矿方案,烧结杯实验结果显示均获得优良的烧结指标,证实了基于铁矿粉高温特性进行配矿的优越性.

Optimization of ore blending during sintering based on complementation of high temperature properties

The high temperature properties of 10 iron ores from Brazil,Australia and China were measured.By comparison with the optimal zone acquired from practical production statistics,several results were obtained as the following.The assimilability of Brazilian and Australian ores is lower and higher than the optical zone,respectively,but that of Chinese concentrate powders is close to the optical zone.The liquid-phase fluidity of two Brazilian ores,one Australian ore and one Chinese concentrate powder is optimal,one Brazilian ore,one Australian ore and two Chinese concentrate powders have low liquid-phase fluidity,but one Australian ore and one Chinese concentrate powder possess high liquid-phase fluidity.The self-strength of bonding phases in Australian ores is low,but optimal for Brazilian ores and Chinese concentrate powders,while the self-strength of bonding phases in Chinese concentrate powders is higher than in Brazilian ores.On the basis of experimental research,a new concept,which makes the high temperature properties of mixed ores optimal based on complementation of high temperature properties,was proposed,and the optimization schemes of ore blending were designed.The result of sinter pot test indicates that good sintering indexes are obtained,which proves the superiority of ore blending based on high temperature properties of iron ores.