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采用压团、焙烧、分步还原(Fe_2O_3→Fe_3O_4,Fe_3O_4→Fe_xO,Fe_xO→Fe)及测定各还原阶段的还原膨胀率的方法来揭示MgO抑制含K、Na碱金属球团还原膨胀的机理。结果表明,随着MgO含量的增加,试样焙烧后磁铁矿或铁酸镁相增加,降低了第一还原阶段的还原膨胀率;含MgO试样焙烧时会生成高熔点渣相,从而抑制第二还原阶段的还原膨胀;MgO的添加抑制了铁晶须的生长,使得第三还原阶段的还原膨胀率降低。
The mechanism of MgO inhibiting the reduction and swelling of K, Na-containing alkali metal pellets was revealed by the methods of compacting, calcining and fractional reduction (Fe 2 O 3 → Fe 3 O 4, Fe 3 O 4 → Fe_xO, Fe_xO → Fe) and determining the reduction and expansion rates of each reduction stage. The results show that with the increase of MgO content, the magnetite or magnesium ferrite phase increases after calcination, which reduces the reduction and expansion rate of the first reduction stage. When the MgO-containing sample is calcined, the high melting point slag phase will be formed, The reduction and expansion in the second reduction stage; the addition of MgO suppresses the growth of the iron whiskers, resulting in a reduction in the reduction and expansion in the third reduction stage.