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The Behavior of Phosphorus in Direct-Reduced Iron and Hot Briquetted Iron

机译：直接还原铁和热压块铁中磷的行为

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摘要

The goal of this study is to obtain a fundamental understanding of the behavior of phosphorus in direct-reduced iron (DRI) and hot briquetted iron (HBI) materials during melting Seven commercial DR and HBI products were studied. The research included a microscopic characterization of each material, laboratory experiments examining the rates of phosphorus transfer and gangue separation during melting and direct microscopic observation of the melting phenomenon. Results indicate that the phosphorus in DRI/HBI is initially associated with the gangue phase. However experiments also indicate that phosphorus transfer between gangue and metal in direct-reduced materials is much faster than the physical separation of the gangue and metal during melting. This fast rate of chemical transfer is due to the high surface area between metal and gangue. These observations are supported by a mass transfer controlled rate model using estimated values for the gangue-metal interfacial area and the mass transfer coefficient. The melt-in phosphorus content of the metal depends on the temperature and gangue chemistry.
机译：这项研究的目的是对熔融过程中直接还原铁（DRI）和热压块铁（HBI）材料中磷的行为有基本的了解，研究了七个商业DR和HBI产品。该研究包括对每种材料的微观表征，实验室实验以检查熔化过程中磷的传输速率和脉石的分离以及对熔化现象的直接显微镜观察。结果表明，DRI / HBI中的磷最初与脉石相有关。然而，实验还表明，在直接还原的材料中，煤ue石和金属之间的磷转移比熔融过程中煤the石和金属的物理分离要快得多。这种快速的化学传递速率是由于金属和脉石之间的表面积很大。这些观察结果得到了使用煤controlled石-金属界面面积和传质系数估算值的传质控制速率模型的支持。金属的熔化磷含量取决于温度和脉石化学。

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