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工业制取的镁平均含有,％:Fe 0.03;Si 0.002;Al 0.01;Ni 0.0005;Cu 0.002;Mn 0.01;Cl 0.003;Zn 0.005;Pb 0.002;Ca 0.002;Cr(0.5～1.3)×10~(-4);Ti(1～8)×10~(-4);Sb(7～9)×10~(-6);Cd(0.5～1.2)×10~(-5);P(1～4)×10~(-3);As(1.5～3.0)×10~(-4);N(0.5～2)×10~(-3);C(1～4)×10~(-3);O(2～4)×10~(-2);以及Bi、Cs、Co各约10~(-3);Sn和Rb各为5×10~(-4);Sn、Ba、Mo、Ag、Sr、W各为1×10~(-4);Hf2×10~(-4)。镁中金属夹杂物主要来源于盐类原料、炉衬和电极材料。大气中的氧、氢和氮也会进入
Commercially available magnesium contains, on average,%: Fe 0.03; Si 0.002; Al 0.01; Ni 0.0005; Cu 0.002; Mn 0.01; Cl 0.003; Zn 0.005; Pb 0.002; Ca 0.002; Cr (0.5 to 1.3) × 10 -4); Ti (1~8) × 10 -4; Sb (7~9) × 10 -6; Cd (0.5~1.2) × 10 -5; P (1~8) 4 × 10 -3; As 1.5 ~ 3.0 × 10 -4; N 0.5 ~ 2 × 10 -3; C 1 ~ 4 × 10 -3 ); O (2 ~ 4) × 10 -2; and Bi, Cs and Co each about 10-3; Sn and Rb each are 5 × 10 -4; Sn, Ba and Mo , Ag, Sr and W are each 1 × 10 -4 and Hf 2 × 10 -4. Magnesium metal inclusions mainly from salt materials, lining and electrode materials. The atmosphere of oxygen, hydrogen and nitrogen will enter