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Open AccessArticle

Reaction Mechanism and Process Control of Hydrogen Reduction of Ammonium Perrhenate

1
School of Biomedical & Chemical Engineering, Liaoning Institute of Science and Technology, Benxi 117004, China
2
Superalloys research department, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
3
College of chemistry, Liaoning University, Shenyang 110036, China
4
Key Laboratory for Ecological Utilization of Multimetallic Mineral, Ministry of Education, Northeastern University, Shenyang 110819, China
*
Authors to whom correspondence should be addressed.
Metals 2020, 10(5), 640; https://doi.org/10.3390/met10050640
Received: 17 April 2020 / Revised: 8 May 2020 / Accepted: 13 May 2020 / Published: 15 May 2020
(This article belongs to the Special Issue Advances in Synthesis of Metallic, Oxidic and Composite Powders)
The preparation of rhenium powder by a hydrogen reduction of ammonium perrhenate is the only industrial production method. However, due to the uneven particle size distribution and large particle size of rhenium powder, it is difficult to prepare high-density rhenium ingot. Moreover, the existing process requires a secondary high-temperature reduction and the deoxidization process is complex and requires a high-temperature resistance of the equipment. Attempting to tackle the difficulties, this paper described a novel process to improve the particle size distribution uniformity and reduce the particle size of rhenium powder, aiming to produce a high-density rhenium ingot, and ammonium perrhenate is completely reduced by hydrogen at a low temperature. When the particle size of the rhenium powder was 19.74 µm, the density of the pressed rhenium ingot was 20.106 g/cm3, which was close to the theoretical density of rhenium. In addition, the hydrogen reduction mechanism of ammonium perrhenate was investigated in this paper. The results showed that the disproportionation of ReO3 decreased the rate of the reduction reaction, and the XRD and XPS patterns showed that the increase in the reduction temperature was conducive to increasing the reduction reaction rate and reducing the influence of disproportionation on the reduction process. At the same reduction temperature, reducing the particle sizes of ammonium perrhenate was conducive to increasing the hydrogen reduction rate and reducing the influence of the disproportionation. View Full-Text
Keywords: ammonium perrhenate; rhenium; disproportionation reaction; hydrogen reduction ammonium perrhenate; rhenium; disproportionation reaction; hydrogen reduction
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  • Externally hosted supplementary file 1
    Doi: 10.3390/app10020656
    Link: https://www.mdpi.com/2076-3417/10/2/656
    Description: Our rhenium metallurgical process optimization work is divided into two parts; previous work on recrystallization of ammonium perrhenate has been published in Appl. Sci. 2020, 10(2), 656; we hope to publish the following research results on reduction mechanism and process optimization in Metals.
MDPI and ACS Style

Tang, J.; Sun, Y.; Zhang, C.; Wang, L.; Zhou, Y.; Fang, D.; Liu, Y. Reaction Mechanism and Process Control of Hydrogen Reduction of Ammonium Perrhenate. Metals 2020, 10, 640.

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