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Yanbiao Chen, Wenguo Liu, and Haibin Zuo, Phosphorus reduction behavior of high-phosphate iron ore during hydrogen-rich sintering, Int. J. Miner. Metall. Mater.,(2022). https://doi.org/10.1007/s12613-021-2385-0
Cite this article as:
Yanbiao Chen, Wenguo Liu, and Haibin Zuo, Phosphorus reduction behavior of high-phosphate iron ore during hydrogen-rich sintering, Int. J. Miner. Metall. Mater.,(2022). https://doi.org/10.1007/s12613-021-2385-0
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研究论文

高磷铁矿富氢烧结过程中磷的还原行为研究

  • 通讯作者:

    左海滨    E-mail: zuohaibin@ustb.edu.cn

  • 高磷铁矿石资源因其磷含量高、矿相结构复杂而被认为是一种难选铁矿石,因此寻找创新性工艺技术实现高磷铁矿资源的高效开发与利用具有重要的理论和实际意义。基于此,提出了富氢烧结过程中进行磷的气化脱除的方法。本文围绕高磷铁矿富氢烧结过程中磷的还原机理进行研究,并采用非等温动力学方法对富氢烧结过程磷灰石还原动力学进行研究。结果表明富氢烧结过程中,随着还原时间从20增加到60 min,脱磷率从10.93%升高到29.51%。随着磷灰石的还原,金属铁聚集,还原出的部分磷气体被金属铁吸收形成稳定的铁磷化合物,导致脱磷率降低。磷灰石还原主要集中在烧结矿带、燃烧带,还原出的磷气体挥发到该区域的烟气中在抽风负压的作用下向下移动,在经过生料层和过湿层时会被冷凝吸附在料层表面,导致气化脱除率大大降低。基于等转化率的Ozawa公式计算富氢烧结过程中磷灰石还原活化能为80.42 kJ/mol。磷灰石还原的机理函数由微分法(即Freeman–Carroll法)和积分法(即Coats–Redfern法)确定。方程的微分形式为f(α) = 2(1 − α)1/2,方程的积分形式为G(α) = 1 − (1 − α)1/2.
  • Research Article

    Phosphorus reduction behavior of high-phosphate iron ore during hydrogen-rich sintering

    + Author Affiliations
    • High-phosphorus iron ore resource is considered a refractory iron ore because of its high-phosphorus content and complex ore phase structure. Therefore, the development of innovative technology to realize the efficient utilization of high-phosphorus iron ore resources is of theoretical and practical significance. Thus, a method for phosphorus removal by gasification in the hydrogen-rich sintering process was proposed. In this study, the reduction mechanism of phosphorus in hydrogen-rich sintering, as well as the reduction kinetics of apatite based on the non-isothermal kinetic method, was investigated. Results showed that, by increasing the reduction time from 20 to 60 min, the dephosphorization rate increased from 10.93% to 29.51%. With apatite reduction, the metal iron accumulates, and part of the reduced phosphorus gas is absorbed by the metal iron to form stable iron–phosphorus compounds, resulting in a significant reduction of the dephosphorization rate. Apatite reduction is mainly concentrated in the sintering and burning zones, and the reduced phosphorus gas moves downward along with flue gas under suction pressure and is condensed and adsorbed partly by the sintering bed when passing through the drying zone and over the wet zone. As a result, the dephosphorization rate is considerably reduced. Based on the Ozawa formula of the iso-conversion rate, the activation energy of apatite reduction is 80.42 kJ/mol. The mechanism function of apatite reduction is determined by a differential method (i.e., the Freeman–Carroll method) and an integral method (i.e., the Coats–Redfern method). The differential form of the equation is f(α) = 2(1 − α)1/2, and the integral form of the equation is G(α) = 1 − (1 − α)1/2.
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