Next Article in Journal
A Geostatistical Simulation of a Mineral Deposit using Uncertain Experimental Data
Previous Article in Journal
Volatile Chalcophile Elements in Native Sulfur from a Submarine Hydrothermal System at Kueishantao, Offshore NE Taiwan
Article Menu
Issue 4 (April) cover image

Export Article

Open AccessArticle

Influence of Impurity Dissolution on Surface Properties and NH3-SCR Catalytic Activity of Rare Earth Concentrate

1
School of Energy and Environment, Inner Mongolia University of Science and Technology, Baotou 014010, China
2
State Key Laboratory of Multi-metal Resources Comprehensive Utilization, Baiyun Obo Mine, Inner Mongolia Autonomous Region, Baotou 014010, China
*
Authors to whom correspondence should be addressed.
Minerals 2019, 9(4), 246; https://doi.org/10.3390/min9040246
Received: 4 April 2019 / Revised: 17 April 2019 / Accepted: 18 April 2019 / Published: 22 April 2019
(This article belongs to the Section Mineral Processing and Metallurgy)
  |  
PDF [4117 KB, uploaded 26 April 2019]
  |  

Abstract

Impurity removal and modification of rare earth concentrate powder were conducted by roasting weak acid-weak alkali leaching to obtain the active components of denitrification catalysts. NH3 selective catalytic reduction catalyst samples were prepared by mixing and kneading with pseudo-γ-Al2O3 boehmite as carrier. The results showed that the Ce7O12 content in the active component samples increased and dispersed more evenly. The grain size of the samples was refined, the specific surface area increased, and the active sites exposed more. Ce coexists in the form of Ce3+ and Ce4+. Fe coexists in the form of Fe3+ and Fe2+, but Fe3+ is abundant. Some Ce, La, Nd, Pr, Fe, Mn, and other components formed solid melts during preparation, which increased the synergistic catalytic effect. The denitrification efficiency of the catalyst sample was 92.8% under the conditions of reaction temperature 400 °C, NO content was 600 ppm, NH3/NO ratio was 1.5, and O2 concentration was 4%. View Full-Text
Keywords: rare earth concentrate; impurity dissolution; NH3-SCR catalyst; denitrification rare earth concentrate; impurity dissolution; NH3-SCR catalyst; denitrification
Figures

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
SciFeed

Share & Cite This Article

MDPI and ACS Style

Zhang, K.; Zhu, J.; Zhang, S.; Li, N.; Luo, H.; Li, B.; Zhao, Z.; Jin, G.; Wu, W. Influence of Impurity Dissolution on Surface Properties and NH3-SCR Catalytic Activity of Rare Earth Concentrate. Minerals 2019, 9, 246.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Minerals EISSN 2075-163X Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top