澳精粉配比对氧化球团质量的影响规律

Influence of Australian Ore powder Ratio on Oxidation Pellets

为了确定澳精粉和冀东磁铁精粉两种矿粉造球的较佳配比,对澳精粉、冀东磁铁精粉进行理化性能测定、颗粒形貌观察以及球团工艺试验进行研究,并在此基础上分析球团矿显微形貌。研究结果表明:澳精粉微细颗粒含量较少,粒度较粗,颗粒表面较粗糙,配加澳精粉可以改善冀东磁铁精粉的成球特性;当澳精粉配加量高于15%时,生球的落下强度小于3.0次/个球;当澳精粉配加量超过10%时,球团抗压强度小于2000N;当澳精粉配比不超过15%时,各个配比方案的球团矿冶金性能均能够满足生产的需求。球团矿矿相以赤铁矿为主,且显微形貌随着澳粉配比增加,由赤铁矿晶相间相互紧密连成一片,逐渐转变成赤铁矿间多以细小赤铁矿晶键连接,导致球团矿抗压强度降低。

In order to determine the optimum ratio of the Australian ore powder and the magnetic iron powder,the physical and chemical properties measurement,particle morphology observation and pellet test were carried out,on this basis,the microstructure of pellets was analyzed.The results show that:the fine particle content of Australian ore powder is less,the size is coarser and the particle surface is coarser,and the ball property of magnetic iron powder can be improved by adding the Australian ore powder.When Australian ore powder ratio is higher than 15%,the drop strength of the ball is less than 3.0 time/a ball.The compressive strength of the ball group was less than 2000 N when Australian ore powder ratio was more than 10%.The metallurgical properties of the pellets can be meet the demand of production,when Australian ore powder ratio is no more than 15%.The primary mineral compositions of pellet was hematite,with Australian ore powder ratio increasing,the micromorphology of the pellets is closely connected with the hematite interphase,and gradually turns into small hematite to be connected,therefore,the compressive strength of pellets is reduced.