MgO对铁矿球团还原冶金性能的影响

研究考察了MgO对铁矿球团低温还原粉化率(RDI)、还原性(RI)以及还原膨胀率(RSI)等几种冶金性能的影响.结果表明:当MgO添加剂质量分数由0增加至2.0%时，铁矿球团的低温还原粉化率(RDI)和还原膨胀率(RSI)都逐渐下降，分别下降了6.46%与6.21%，还原粉化和还原膨胀现象得到抑制；同时，铁矿球团的还原性(RI)呈现逐渐上升趋势，升高了4.66%；故适量添加MgO有利于改善铁矿球团的冶金性能.通过分析配加MgO添加剂后铁矿球团的微孔情况及矿物组成的变化，研究解明了MgO对铁矿球团冶金性能的影响原因.

Investigation on Effect of MgO on Reduction Metallurgical Properties of Iron Ore Pellet

The effect of MgO on reduction metallurgical properties of pellets were investigated， such as low-temperature reduction degradation index(RDI)， reduction index(RI)and reduction swelling index(RSI). The results show that， with the addition of MgO-bearing additive from 0 to 2.0% in pelletizing， the RDI and RSI decrease gradually， and the value of RDI and RSI decrease by 6.46% and 6.21% respectively， which means that the reduction degradation phenomenon and reduction swelling phenomenon are inhibited. The RI of pellets increased by 4.66% with the addition of MgO bearing additive from 0 to 2.0% in pellets， and therefore the addition of MgO is favorable to improve the reduction metallurgical properties of pellets. Based on the pore space analysis and mineral composition analysis of different MgO-bearing pellets， the reasons for the variation of metallurgical properties of pellets were clarified.