Influence of Temperature and Fe 2 O 3 on Phosphorus Recovery from Dephosphorization Slag by Reduction

The reduction and recovery of P 2 O 5 in dephosphorization slag were examined to establish a new recycling process for dephosphorization slag. The dephosphorization slag is obtained from the dephosphorization furnace in the duplex converter process, and the content of P 2 O 5 in the dephosphorization slag can reach 9 wt.%. The dephosphorization slag is considered to be a prospective resource of phosphorus due to its high content of P 2 O 5 . To explore the effects of temperature and Fe 2 O 3 content in slag on phosphorus recovery from dephosphorization slag, the experimental slag was reduced by carbon powder in a resistance furnace. The results show that the temperature and content of Fe 2 O 3 in slag have a significant effect on the reduction in P 2 O 5 , and the reduction and recovery ratios of P 2 O 5 in slags increase with the increase in the experimental temperature and content of Fe 2 O 3 , reaching 94.41% and 83.09%, respectively. It has been indicated that phosphorus recovery from dephosphorization slag using carbothermic reduction has significant environmental and economic benefits.