What is it about?
This paper describes a new strategy for the precipitation and recovery of niobium (Nb) and tantalum (Ta) from their alkaline solutions. The precipitation reactions that occur are discussed and the Nb or Ta precipitates were characterized by elemental analysis, Raman spectroscopy and TGA-MS.
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Why is it important?
Niobium and tantalum are directly precipitated at basic pH using calcium-bearing reagents (calcium chloride, calcium acetate, calcium hydroxide...). This allows to recover Nb and Ta without neutralizing the initial solution and, as a consequence, drastically reduces the consumption of reactant. The proposed method can be operated in a wide pH range (pH > 9).
Perspectives
This new method could be useful for hydrometallurgical processes which aims at extracting and purifying Nb and Ta from ores or industrial concentrates.
Dr Gauthier J-P. Deblonde
Lawrence Livermore National Laboratory
Read the Original
This page is a summary of: Direct precipitation of niobium and tantalum from alkaline solutions using calcium-bearing reagents, Hydrometallurgy, October 2016, Elsevier,
DOI: 10.1016/j.hydromet.2015.12.009.
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