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Open AccessArticle

The Influences of Stirring on the Recrystallization of Ammonium Perrhenate

1
School of Biomedical & Chemical Engineering, Liaoning Institute of Science and Technology, Benxi 117004, China
2
Key Laboratory for Ecological Utilization of Multimetallic Mineral, Ministry of Education, Northeastern University, Shenyang 110819, China
3
Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
4
Electrical engineering, Shenyang Polytechnic College, Shenyang 110045, China
5
College of chemistry, Liaoning University, Shenyang 110036, China
*
Authors to whom correspondence should be addressed.
Appl. Sci. 2020, 10(2), 656; https://doi.org/10.3390/app10020656
Received: 16 December 2019 / Revised: 8 January 2020 / Accepted: 13 January 2020 / Published: 16 January 2020
(This article belongs to the Section Chemistry)
Ammonium perrhenate is widely used in alloy manufacturing, powder processing, the catalytic industry, and other fields. Recrystallization can improve the specific surface area of ammonium perrhenate, reduce its particle size, and improve its particle size distribution uniformity. Therefore, recrystallized ammonium perrhenate can obtain better application benefits in the above fields. Stirring is an important factor that affects the recrystallization of ammonium perrhenate, and this paper systematically analyzes the influence of the stirring paddle types and stirring intensities on ammonium perrhenate during the homogeneous recrystallization process, ultimately revealing the relationship between the growth rate of ammonium perrhenate and the stirring process. Particle image velocimetry physical simulation results showed that the flow field in the reactor was more evenly distributed when using the disc turbine impeller, and a relatively uniform velocity liquid flow area was formed in the whole reactor, while the low-velocity liquid flow area was smaller. Therefore, this information, combined with SEM test results, suggests that under the same recrystallization time and stirring intensity, the stirring effect of a disc turbine impeller is more suitable than a propelling propeller and an Intermig impeller for the recrystallization process of ammonium perrhenate. Moreover, the XRD patterns and SEM analysis showed that if the agglomeration in the systems was too strong or too weak, the growths of the (101) crystal plane and (112) crystal plane were restrained, which caused an attenuation in the growth rates along the crystallographic directions that were orthogonal to the crystal faces. Finally, the reduction experiments show that the recrystallization of ammonium perrhenate could improve the phase parameters of rhenium powders. View Full-Text
Keywords: ammonium perrhenate; recrystallization; stirring paddle type; agglomeration ammonium perrhenate; recrystallization; stirring paddle type; agglomeration
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MDPI and ACS Style

Tang, J.; Feng, L.; Zhang, C.; Sun, Y.; Wang, L.; Zhou, Y.; Fang, D.; Liu, Y. The Influences of Stirring on the Recrystallization of Ammonium Perrhenate. Appl. Sci. 2020, 10, 656.

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