镁是一种轻金属。在现代飞机的制造中,它的用途日见推广,它的地位日见重要。在第二次世界大战期中,美国人为了适应镁的生产的需要,曾经发明了一种从海水中提取它的方法。这方法的成效,很是显著。採用这方法来实行提炼它的公司,是德武(Dow)化学公司,设厂的地点,乃是在特克萨斯州内,濱鄰墨西哥湾(Gulf of Mexico)的费礼普(Freeport)。这方法大致可以分为三个步骤,如附图所示。第一步是将海水与石灰水(即氢氧化钙)相搅拌, Magnesium is a light metal. In the manufacture of modern aircraft, its use is increasingly seen and its status is increasingly important. During the Second World War, Americans had invented a method to extract it from seawater in order to meet the needs of magnesium production. The effectiveness of this method is very significant. The company that used this method to refine it was the Dow Chemical Company. The location of the factory was in Texas, and it was located in Freeport, near the Gulf of Mexico. . This method can be roughly divided into three steps, as shown in the attached figure. The first step is to stir the seawater with lime water (ie calcium hydroxide).