Magnetic Separation of Phosphorus Enriched Phase from Multiphase Dephosphorization Slag
Magnetic Separation of Phosphorus Enriched Phase from Multiphase Dephosphorization Slag
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DOI：
10.2355/isijinternational.50.59
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发表时间：
2010-01
影响因子：
1.8
通讯作者：
Hironari Kubo;Kazuyo Matsubae-Yokoyama;T. Nagasaka
中科院分区：
文献类型：
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作者：
Hironari Kubo;Kazuyo Matsubae-Yokoyama;T. Nagasaka
结果表明，磷在废铁实际预处理渣（脱磷渣）中表现出明显的偏析，以3CaO·P2O5-2CaO·SiO2固溶体形式存在，以FeO-CaO-SiO2为基体。由于它们的磁性有很大的不同，在超导强磁场的帮助下可以将它们分离开来。研究磁场强度的影响,熔渣的颗粒大小,等等,一个实验在磁选进行了使用模拟脱磷渣(曹FetO - 45.9 - 18.1 - 20.3 -二氧化硅- 6.6 - 5.5 p2o5 - 2.5 - mno -——分别在质量%)和一个与0.5 - -2.5 t超导磁体强磁场,恢复渣的质量变得更好的由于更少污染FetO矩阵的阶段,而其数量的恶化和回收熔渣的数量下降。然而，通过重复该过程可以提高回收渣的数量。在本实验中，在0.5 T、粒径小于35 μm、水渣比为32的条件下，单道工序可回收约65%的富磷相，FetO基质相污染小于10%。回收渣中P2O5含量与初始渣中富磷相中P2O5含量相近，FeO含量随磁选过程明显降低。
The authors have found that phosphorus exhibits remarkable segregation in exhausted actual hot-metal pretreatment slag (dephosphorization slag), and it exists as a 3CaO·P2O5–2CaO·SiO2 solid solution with the FeO–CaO–SiO2 matrix. Since their magnetic properties are significantly different, it is possible to separate them with the aid of a superconducting strong magnetic field. To investigate the effects of magnetic field strength, the particle size of the slag, etc., an experiment on magnetic separation has been carried out using simulated dephosphorization slag (18.1FetO–45.9CaO–20.3SiO2–6.6P2O5–2.5MnO–5.5MgO in mass%) and a superconducting magnet with 0.5–2.5 T. In a stronger magnetic field, the quality of the recovered slag becomes better due to less contamination of the FetO matrix phase, while its quantity worsens and the amount of recovered slag declines. However, the quantity of the recovered slag can be improved by repeating the procedure. In the present experiment, about 65% of the phosphorus enriched phase can be recovered with less than 10% of FetO matrix phase contamination at conditions of 0.5 T, a particle size of less than 35 μm, and a water/slag ratio of 32 with a single procedure. The P2O5 content in the recovered slag is close to that in the phosphorus-enriched phase in the initial slag, and the FeO content decreases markedly with magnetic separation.