Bjerre, Anne Belinda

Sørensen, E.

Niobium cannot be separated from zirconium or hafnium when these elements occur together in solution with common anions such as Cl- and SO4—. This is ascribed to the copolymerisation of Nbv and the hydrolyzed ionic species of ZrIVv and HfIV by which the colloidal particles are masked as Zr- and Hf-compounds. In HCl the particles are positively charged as opposed to when they are in sulphate solution where the Zr- and Hf-sulphate complexes confer a negative charge. The two cases are considered separately

Online Research Database In Technology

On the Stabilization of NbV-Solutions by ZrIV and HfIV

http://orbit.dtu.dk/ws/files/53858180/ris_r_551.pdf

On the Stabilization of Nb<sup>V</sup>-Solutions by Zr<sup>I</sup><sup>V</sup> and Hf<sup>I</sup><sup>V</sup>

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