1956年美国用作化学反应剂所消耗的镁大致等于用作结构材料的镁量。在用作还原剂的20000吨镁中,大部分用于生产钛,少部分用于生产锆、铍及铀。镁中的杂质可能进入上述那些金属,并影响它们的临界性质。这类杂质即硼与镉,它们在镁中的允许含量是千万分之几。因此,详细 The magnesium consumed by the United States as a chemical reagent in 1956 was roughly equivalent to the amount of magnesium used as a structural material. Of the 20,000 tons of magnesium used as a reductant, most are used for the production of titanium and a small proportion are used for the production of zirconium, beryllium and uranium. Impurities in magnesium can enter those metals and affect their critical properties. Such impurities that boron and cadmium, magnesium in their allowable content is a few thousandths. Therefore, detailed