Method for synthesizing nano magnesium oxide by microwave-induced combustion

The invention provides a method for preparing nano magnesium oxide by microwave-induced combustion synthesis reaction, which comprises the following steps: dissolving light calcined magnesium oxide prepared from microcrystalline magnesite as a raw material in a dilute nitric acid solution, filtering, taking out filtrate, regulating the pH value of the solution to 8-10 by using stronger ammonia water, standing, and carrying out secondary filtering, so as to obtain a magnesium nitrate solution; a magnesium nitrate solution and one or more of urea, citric acid or glycine are used as raw materials and are mixed according to a certain proportion, and the nano magnesium oxide powder material is prepared by adopting a microwave induced combustion method. And then carrying out heat preservation calcination on the magnesium oxide powder material at 300-600 DEG C for 1-4 hours, carrying out ball milling on the calcined material, and drying to obtain the nanometer magnesium oxide powder. The preparation method has the c