normal align=center>天然放电镁（镁粉）一般技术指标

normal align=center>品级

normal align=center>ω(MnO2)%

normal align=center>ω(TFe)%

normal align=center>制成锰粉的放电时间min

normal align=center>Ⅰ

normal align=center>≥75

normal align=center>≤2.8

normal align=center>≥570

normal align=center>Ⅱ

normal align=center>≥70

normal align=center>≤3.5

normal align=center>≥510

normal align=center>Ⅲ

normal align=center>≥65

normal align=center>≤4.5

normal align=center>≥450

normal align=center>Ⅳ

normal align=center>≥60

normal align=center>≤5.5

normal align=center>≥390

normal align=center>Ⅴ

normal align=center>≥55

normal align=center>≤6.5

normal align=center>≥330

normal align=center>注：其他有害元素一般标准为：ω(Cu)<0.0l％，ω(Ni)<0.03％，ω(Co)<0.02％，ω(Pb)<0.02％。