NH4HF2氟化Fe3O4（磁铁矿）的研究

IF 0.9 4区材料科学 Q3 Materials Science

Journal of The South African Institute of Mining and Metallurgy Pub Date : 2023-02-10 DOI:10.17159/2411-9717/1639/2022

L. Zhang, Y. Zhou, H. Wang, C. Mo

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引用次数: 0

摘要

采用热重法和差热分析(TG-DTA)研究了NH4HF2对磁铁矿(Fe3O4)的氟化反应，并利用扫描电子显微镜、x射线能谱仪(SEM-EDS)和x射线衍射仪(XRD)观察了氟化反应的形貌和相变化。结果表明，氧参与的氟化反应始于室温，在1784℃时达到峰值，在200℃时完成，只生成(NH4)3FeF6。加热时，(NH4)3FeF6在259℃形成NH4FeF4，逐渐释放出NH4F，然后(NH4)0。在327℃时，FeF3与FeF3在400℃时，由于Fe (III)部分还原为Fe (II)，最终FeF3与少量FeF2。在550℃时，FeF3被氧化为FeOF/Fe2O3。

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Studies on fluorination of Fe3O4 (magnetite) by NH4HF2

Fluorination of magnetite (Fe3O4) by NH4HF2 was investigated using simultaneous thermogravimetry and differential thermal analysis (TG-DTA), and observing the morphology and phase changes using scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM-EDS) and X-ray diffractometry (XRD). The results indicate that fluorination with the involvement of oxygen begins at room temperature, peaks at 1784ºC, and is completed at 200ºC with the formation of only (NH4)3FeF6. On heating, (NH4)3FeF6 gradually releases NH4F by the formation of NH4FeF4 at 259ºC, then (NH4)0.l8FeF3 at 327ºC, and finally FeF3 with minor FeF2 at 400ºC due to the partial reduction of Fe (III) to Fe (II). At 550ºC, FeF3 is oxidized to FeOF/Fe2O3.

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来源期刊

Journal of The South African Institute of Mining and Metallurgy 工程技术-矿业与矿物加工

CiteScore

1.50

自引率

11.10%

发文量

审稿时长

4-8 weeks

期刊介绍： The Journal serves as a medium for the publication of high quality scientific papers. This requires that the papers that are submitted for publication are properly and fairly refereed and edited. This process will maintain the high quality of the presentation of the paper and ensure that the technical content is in line with the accepted norms of scientific integrity.