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镁是地球含量最丰富的元素之一,主要以菱镁矿的天然赋存形态出现。菱镁矿的世界年产量为1900万ｔ。天然菱镁矿大多利用高温处理法转换为氧化镁。氧化镁也可利用氢氧化镁的高温转化法从海水和盐水中制得。不过每年生产的800万ｔ氧化镁中有84%还是来自天然菱镁矿。由于氧化镁熔点
Magnesium is one of the most abundant elements in the earth and it occurs mainly in the natural form of magnesite. The annual output of magnesite is 19 million tons. Most of the natural magnesite is converted to magnesia by high temperature treatment. Magnesium oxide can also be produced from seawater and brine using high temperature conversion of magnesium hydroxide. However, 84% of the 8 million tons of magnesium oxide produced each year are still from natural magnesite. Due to the melting point of magnesium oxide