Recovery of Phosphorus from Dephosphorization Slag Produced by Duplex High Phosphorus Hot Metal Refining
Recovery of Phosphorus from Dephosphorization Slag Produced by Duplex High Phosphorus Hot Metal Refining
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DOI：
10.2355/isijinternational.52.955
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发表时间：
2012-06
影响因子：
1.8
通讯作者：
J. Diao;B. Xie;Yonghong Wang;Xu Guo
中科院分区：
文献类型：
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作者：
J. Diao;B. Xie;Yonghong Wang;Xu Guo
磷矿是一种重要的不可再生资源。为了寻找新的磷来源，本文对双相炼钢工艺脱磷渣（De-P_De-C炼钢工艺中的De-P渣）中磷的回收进行了研究。结果表明，脱磷渣中富P相难以通过磁选有效回收，这是由于富P相镶嵌在渣中富Fe相中的原因。还得到了P回收率与磁场强度和炉渣粒度之间的关系。设计了一系列炉渣改性实验，研究从双联高磷铁水精炼产生的高P2O5含量脱磷渣中回收磷。研究发现SiO2、Al2O3和TiO2的添加对P回收率有积极影响。然而，P回收率和未磁化渣中P2O5的浓度随着SiO2和Al2O3含量的增加而呈现出倒数关系。 FetO和MnO的添加对P回收率影响不大。此外，在搅拌条件下P回收率增加。添加 10% SiO2 和 Al2O3 时，未磁化相中分别回收了 74% 和 87% P。结果表明，通过炉渣改性和磁选可以回收炉渣中的大部分磷。
Phosphate rock is a vital nonrenewable resource. In order to find new source of phosphorus, the recovery of phosphorus from dephosphorization slag produced by duplex steelmaking process (De–P slag in De–P_De–C steelmaking process) was investigated in the present paper. It was demonstrated that the Prich phase in dephosphorization slag is difficult to recover effectively by magnetic separation as the reason of P enriched phase inlay in the Fe enriched phase in the slag. The relationship between P recovery ratio and magnetic intensity and slag particle size were also obtained. A series of slag modification experiments were designed to investigate the recovery of phosphorus from high P2O5 content dephosphorization slag produced by duplex high phosphorus hot metal refining. It was found that the addition of SiO2, Al2O3 and TiO2 has a positive influence on the P recovery ratio. However, the P recovery ratio and the concentration of P2O5 in unmagnetized slag showed a reciprocal relationship with increasing SiO2 and Al2O3 content. The P recovery ratio was little affected by the addition of FetO and MnO. Furthermore, the P recovery ratio increased under the stirring condition. 74% and 87% P were recovered in the unmagnetized phases with adding 10% SiO2 and Al2O3, respectively. The results demonstrated that most of the phosphorus in the slag could be recovered through slag modification and magnetic separation.