The difference of 0.013% implies little pollution coming from the reduction and milling processes. A high-grade reduced iron powder containning 0.12-0.15% AIC may be prepared if the AIC of ore powder is controlled to be less than 0.07%.

• 若严格控制选矿过程；将精矿粉AIC控制在0.；07%25左右；并防止还原时可能造成的污染；有可能得到AIC为0