Influence of Partial Pressure of Sulfur and Oxygen on Distribution of Fe and Mn between Liquid Fe-Mn Oxysulfide and Molten Slag
Influence of Partial Pressure of Sulfur and Oxygen on Distribution of Fe and Mn between Liquid Fe-Mn Oxysulfide and Molten Slag
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DOI：
10.1007/s11663-012-9684-9
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发表时间：
2012-06
期刊：
影响因子：
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通讯作者：
Sun-joong Kim;H. Shibata;Junjiro Takekawa;S. Kitamura;K. Yamaguchi,;Youn‐Bae Kang
中科院分区：
文献类型：
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作者：
Sun-joong Kim;H. Shibata;Junjiro Takekawa;S. Kitamura;K. Yamaguchi,;Youn‐Bae Kang
提出了一种从炼钢渣中回收锰的创新工艺。这个过程从炼钢渣的硫化开始，通过形成液态硫化物相（哑光）来分离P和Mn。然后，将得到的磨砂进行弱氧化，形成不含磷的富锰氧化物相，通过还原富锰氧化物相，可制得高纯度的铁锰合金。然而，据作者所知，对含P和Mn的熔渣的硫化还没有充分的研究。最近发现，P在与熔渣的平衡态中没有分布到冰粉中。为了了解这一过程的发展，研究硫和氧的分压对冰粉和熔渣之间Mn和Fe平衡分布的影响是很重要的。在目前的工作中，对冰晶的矿物学微观结构分析表明，硫化物和金属相的存在取决于硫和氧的分压。随着硫分压的增大，磨砂中的Mn含量增加，而磨砂中的O含量减少。相反，当在−11以下的对数下观察到金属相时，磨砂中Mn/Fe的比值是恒定的。这些结果也对应了MnS/FeS的活度系数比与matte中MnS/FeS的摩尔分数之间的关系。随着MnS/FeS摩尔分数的增加，γ - MnS/γ - FeS值呈指数下降。
The authors proposed an innovative process for recovering Mn from steelmaking slag. The process starts with the sulfurization of steelmaking slag to separate P from Mn by the formation of a liquid sulfide phase (matte). Then, the obtained matte is weakly oxidized to make a Mn-rich oxide phase without P. High-purity Fe-Mn alloys can therefore be produced by the reduction of the Mn-rich oxide phase. However, to the authors’ knowledge, the sulfurization of molten slag containing P and Mn has not been sufficiently investigated. It was recently found that P was not distributed to the matte in equilibrium with the molten slag. To gain knowledge of the process’s development, it is important to investigate the influence of the partial pressures of sulfur and oxygen on the equilibrium distribution of Mn and Fe between the matte and the molten slag. In the current work, a mineralogical microstructure analysis of the matte revealed that the existence of the oxysulfide and metal phases was dependent on the partial pressure of sulfur and oxygen. The Mn content of the matte increased with partial pressure of sulfur while the O content of the matte decreased. In contrast, the ratio of Mn/Fe in the matte was constant when the metal phase of the matte was observed at a logbelow −11. These results also corresponded to the relationship between the activity coefficient ratio of MnS/FeS and the mole fraction of MnS/FeS in the matte. TheγMnS/γFeSvalue decreased exponentially as the mole fraction of MnS/FeS increased.