MgO对以细磁铁精矿为主的烧结矿微观结构的影响

研究了MgO对以细磁铁精矿为主的烧结矿显微结构的影响。显微结构分析表明：烧结矿MgO的质量分数从1．4%提高到2．3％时，MgO对烧结矿微观结构具有明显的影响。低MgO时，未氧化的Fe3O4及其部分氧化生成的Fe2O3与铁酸钙粘结相形成了烧结矿良好的显微结构，其烧结矿强度良好。高MgO时，烧结矿生成了大块再结晶磁铁矿，同时生成了铁酸镁和镁铁橄榄石等一系列含镁矿物，MgO稳定了磁铁矿和含镁矿物的晶格，这些矿物与赤铁矿、铁酸钙等共存和互连。但MgO矿化需要较高的烧结温度和较长的高温保持时间，垂直烧结速度和利用系数有明显的降低。

Influence of MgO on Microstructure of Fine Magnetite Concentrate Based Sinter

The influence of MgO on microstructure of fine magnetite concentrate based sinter was studied.The results showed that MgO has an obvious influence on the microstructure of sinter while the content of MgO is increased from 1.4% to 2.3%.When the content of MgO is at low level(1.4%),Fe_3O_4 and Fe_2O_3 oxidized from Fe_3O_4 are combined with calcium ferrite phase forming sinter with good microstructure and high strength.When the content of MgO is higher,massive recrystallized Fe_3O_4,magnesium ferrite and hortonolite are formed.MgO stabilizes the crystal lattice of Fe_3O_4 and magnesian minerals and these minerals coexist and interconnect with hematite and calcium ferrite.But the mineralization of MgO needs higher temperature and longer time,thus the vertical sintering velocity and utilization coefficient of sintering are decreased obviously.