Method for preparing silicon steel magnesium oxide by taking dolomite and bischofite as raw materials

The invention provides a method for preparing silicon steel magnesium oxide by using dolomite and bischofite as raw materials, which comprises the following steps: step 1, crushing and calcining dolomite to obtain light-burned dolomite, adding the light-burned dolomite into water, and digesting and hydrating to form dolomite digestive fluid; step 2, dissolving bischofite, filtering and removing impurities to prepare a magnesium chloride solution; 3, boric acid is added into the magnesium chloride solution, and the content of boron in magnesium oxide is controlled to be 0.005-0.12%; step 4, adding the magnesium chloride solution into the dolomite digestive juice, stirring, reacting to form magnesium hydroxide precipitate, and cleaning and filter-pressing the prepared magnesium hydroxide precipitate to obtain a magnesium hydroxide filter cake; and 5, calcining the magnesium hydroxide filter cake to obtain magnesium oxide. According to the invention, two cheap resources of dolomite and bischofite are used as raw