... other electronic components. In magnesium compoundsMagnesium compounds, primarily magnesium oxide (MgO), are used as a refractory material in furnace ... iron, steel, nonferrous metals, glass and cement. Magnesium oxide and other magnesium compounds are also used in the agricultural ... as a laxative, and as a highly soluble fertilizer.Magnesium hydroxide, suspended in water, is used in milk of magnesia ...