電磁選
分選級數(shù)應(yīng)視電磁部分的礦物組合、含量等因素而定，電磁性部分的純度應(yīng)在95％以上(非電磁性礦物具有電磁性礦物包裹體或連生體者除外)，無電磁性部分含電磁性礦物不能超過1％
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