Previous researches show that the secondary hematite is a main factor to result in low temperature reduction degradation of sinter,and its formation relates with MgO content in raw materials of sinter,but the mechanism has been not very clear until now. The mass changes of samples with different proportions of MgO and Fe_2O_3 during heating-up,constant temperature sintering and cooling process were measured to understand quantitatively the effect of MgO content on transformation between Fe_2O_3 and Fe_3O_4 ...
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