Method for evaluating reactivity of silicon steel grade magnesium oxide

The invention belongs to the technical field of magnesium oxide production, and particularly discloses a method for evaluating the reactivity of silicon steel grade magnesium oxide. The evaluation method utilizes differential scanning calorimetry or differential thermal analysis to perform thermal analysis on a mixture of magnesium oxide and fumed silica, and only depends on whether the reaction temperature of magnesium oxide and fumed silica falls into a standard reaction temperature interval or not under specific conditions. Whether the reactivity of the to-be-detected magnesium oxide with unknown activity meets the requirements of silicon steel grade magnesium oxide can be judged and evaluated. Compared with an existing citric acid activity (CAA) method, the evaluation method has the advantages that the influence of a plurality of elements on magnesium oxide activity determination can be eliminated, great deviation of an activity test result caused by attribute differences of a magnesium oxide preparation