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Metallurgical and Materials Transactions B
Published in: Metallurgical and Materials Transactions B 1/2013

01-02-2013

Decomposition of Niobium Ore by Sodium Hydroxide Fusion Method

Authors: Xiu-Li Yang, Xiao-Hui Wang, Chang Wei, Shi-Li Zheng, Qing Sun

Published in: Metallurgical and Materials Transactions B | Issue 1/2013

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Abstract

The decomposition kinetics of niobium ore in the NaOH system was studied experimentally. The results show that the reaction products are sodium metaniobate and sodium niobate formed by the reaction of pyrochlore with sodium hydroxide under roasting. The effects of temperature, particle size, and mass ratio of alkali-to-ore were studied. The conversion rate of niobium exceeded 99 pct after 20 minutes at 923 K (650 °C) with a mass ratio of alkali-to-ore 1.2:1 and with initial particle size 75 to 106 μm. The kinetic study indicates that the shrinking core model is applicable and the process is controlled by a chemical reaction. The activation energy was calculated to be 78.82 kJ mol–1.
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Metadata
Title
Decomposition of Niobium Ore by Sodium Hydroxide Fusion Method
Authors
Xiu-Li Yang
Xiao-Hui Wang
Chang Wei
Shi-Li Zheng
Qing Sun
Publication date
01-02-2013
Publisher
Springer US
Published in
Metallurgical and Materials Transactions B / Issue 1/2013
Print ISSN: 1073-5615
Electronic ISSN: 1543-1916
DOI
https://doi.org/10.1007/s11663-012-9766-8

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