Wang, X.H., Zheng, S.L., Xu, H.B. and Zhang, Y. (2009) Leaching of Niobium and Tantalum from a Low-Grade Ore Using a KOH Roast-Water Leach System. Hydrometallurgy, 93, 219-223.
https://doi.org/10.1016/j.hydromet.2009.05.002

has been cited by the following article:

• TITLE: Potash Breakdown of Poly-Mineralized Niobium-Tantalum-Lanthanides Ore Material

  AUTHORS: Mona N. El Hazek, Nawal H. Mohamed, Azza A. Gabr

  KEYWORDS: Lkali Fusion, Agitation Leaching, Niobium-Tantalum-Lanthanides Ores, Polymineralized Ore Material

  JOURNAL NAME: American Journal of Analytical Chemistry, Vol.10 No.3, March 14, 2019

  ABSTRACT: The potentiality of the alkali breakdown of the poly mineralized ore material south Gabal El-A’urf area, central Eastern Desert, Egypt is investigated. It includes the multiple oxide mineral tanteuxenite, monazite, bastnasite, anatase, as well as zircon. This ore material assaying lanthanides (RE2O3 1.9%), niobium (Nb2O5 1.25%) as well as titanium and zirconium (TiO2 and ZrO2 1.23% and 1.12%) respectively besides tantalum (Ta2O5 0.13%), were used for the present work. This sample has thus been subjected to two alkali breakdown techniques using potash; namely agitation leaching and fusion. The latter technique was found to be preferred as it gives higher leaching efficiency. The optimum leaching conditions are weight ratio of the ore/potassium hydroxide 1/2 at 400°C for 1 h. The realized leaching efficiencies attained 95.0% and 93.7% for Nb and Ta respectively as well as 96% for lanthanides and 75% for Ti while that for Zr did not exceed 10%.