It is used to make ceramics, enamels, refractory crucibles, refractory bricks, etc. It can be used as the filler of polishing agent, adhesive, paint and paper, promoter and activator of chloroprene rubber, and mixed with magnesium chloride and other solutions to prepare magnesium oxide cement. It is used in medicine as an antacid and laxative, for gastric acid excess, and for gastric and duodenal ulcer. It is also used in glass, dyeing materials, phenolic plastics, etc. Food grade use is used as decolorizer in sand refining and pH adjustment of ice cream powder.